chg: [dependencies] Updated dependencies.

build(deps-dev): bump setuptools from 69.5.1 to 70.0.0

.editorconfig

@@ -0,0 +1,16 @@
+root = true
+
+[*]
+indent_style = space
+indent_size = 4
+insert_final_newline = true
+trim_trailing_whitespace = true
+end_of_line = lf
+charset = utf-8
+max_line_length = 88
+
+[*.{yml,yaml,json,js,css,html}]
+indent_size = 2
+
+[*.{md,rst}]
+trim_trailing_whitespace = false

.github/workflows/pythonapp.yaml

@@ -0,0 +1,42 @@
+name: Python application
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        python-version: ["3.10", "3.11", "3.12"]
+
+    steps:
+    - uses: actions/checkout@v1
+
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: Install dependencies
+      run: |
+        pip install poetry
+        poetry install --with dev
+
+    - name: Lint with flake8
+      run: |
+        # stop the build if there are Python syntax errors or undefined names
+        poetry run flake8 stegano --count --select=E9,F63,F7,F82 --show-source --statistics
+        # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
+        poetry run flake8 stegano --count --max-complexity=15 --max-line-length=127 --statistics
+
+    - name: Test with pytest
+      run: |
+        poetry run nose2 -v --pretty-assert
+      env:
+        testing: actions
+
+    # - name: Type check with mypy
+    #   run: |
+    #     poetry run mypy .

.github/workflows/release.yml

@@ -0,0 +1,27 @@
+on:
+  release:
+    types:
+      - published
+
+name: release
+
+jobs:
+  pypi-publish:
+    name: Upload release to PyPI
+    runs-on: ubuntu-latest
+    environment:
+      name: pypi
+      url: https://pypi.org/p/Stegano
+
+    permissions:
+      id-token: write  # IMPORTANT: this permission is mandatory for trusted publishing
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Install Poetry
+        run: python -m pip install --upgrade pip poetry
+      - name: Build artifacts
+        run: poetry build
+      - name: Publish package distributions to PyPI
+        uses: pypa/gh-action-pypi-publish@release/v1

.gitignore

@@ -6,14 +6,21 @@ syntax: glob
 *~
 *.db
 
-.idea/
+# Virtualenv
+venv
+build
 
+# setuptools
 build/*
-Stegano.egg-info/*
+stegano.egg-info/
 dist/*
 
+# tests
 .coverage
+.mypy_cache/
+.cache/
 
+# sphinx
 docs/_build
 
 # Emacs
@@ -22,12 +29,10 @@ eproject.cfg
 # Temporary files (vim backups)
 *.swp
 
+.idea/
+
 # Log files:
 *.log
 
 # Vagrant:
 .vagrant/
-
-# Virtualenv
-venv
-build

.pre-commit-config.yaml

@@ -0,0 +1,36 @@
+ci:
+  autoupdate_schedule: monthly
+repos:
+  - repo: https://github.com/asottile/pyupgrade
+    rev: v3.3.1
+    hooks:
+      - id: pyupgrade
+        args: ["--py37-plus"]
+  - repo: https://github.com/PyCQA/isort
+    rev: 5.12.0
+    hooks:
+      - id: isort
+  - repo: https://github.com/psf/black
+    rev: 22.3.0
+    hooks:
+      - id: black
+  - repo: https://github.com/PyCQA/flake8
+    rev: 6.1.0
+    hooks:
+      - id: flake8
+        additional_dependencies:
+          - flake8-bugbear
+          - flake8-implicit-str-concat
+        args: ["--max-line-length=125"]
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.1.0
+    hooks:
+      - id: fix-byte-order-marker
+      - id: trailing-whitespace
+        exclude: .md
+      - id: end-of-file-fixer
+        exclude: tests/.*
+  - repo: https://github.com/pypa/pip-audit
+    rev: v2.7.3
+    hooks:
+      -   id: pip-audit

.readthedocs.yaml

@@ -0,0 +1,22 @@
+# .readthedocs.yaml
+# Read the Docs configuration file
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+
+# Required
+version: 2
+
+# Set the version of Python and other tools you might need
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.11"
+
+# Build documentation in the docs/ directory with Sphinx
+sphinx:
+  configuration: docs/conf.py
+
+# We recommend specifying your dependencies to enable reproducible builds:
+# https://docs.readthedocs.io/en/stable/guides/reproducible-builds.html
+python:
+  install:
+  - requirements: docs/requirements.txt

.travis.yml

@@ -1,14 +0,0 @@
-language: python
-python:
-  - 3.5
-  - 3.6
-
-install:
-  - "pip install -r requirements.txt"
-  - "pip install -r requirements.dev.txt"
-
-script:
-  - nosetests --with-coverage --cover-package=stegano
-
-after_success:
-  - coveralls

CHANGELOG.md

@@ -0,0 +1,341 @@
+## Release History
+
+### 1.0.1 (2025-05-03)
+
+- Improved the packaging configuration for the command line (stegano.console).
+
+
+### 1.0.0 (2025-04-26)
+
+- Updated dependencies.
+- Improved the packaging configuration.
+- Fixed typing errors.
+
+
+### 0.11.5 (2025-02-13)
+
+- Updated dependencies.
+- Aligned pyproject.toml with the standard specification.
+- Publishing to PyPI using a Trusted Publisher.
+
+
+### 0.11.4 (2024-09-07)
+
+- Added a parameter, close_file, to lsb.reveal in order to
+  specify if the file must be closed at the end of the processing.
+
+
+### 0.11.3 (2024-01-02)
+
+- Stegano now supports Python 3.12. Support of Python 3.8 has been removed.
+
+
+### 0.11.2 (2023-05-23)
+
+- improved typing of various functions;
+- updated dependencies.
+
+
+### 0.11.1 (2022-11-20)
+
+- Fixed a bug in the command line when no sub-command is specified.
+
+
+### 0.11.0 (2022-11-20)
+
+- Reduced memory footprint and processing speed,
+  the modules ``lsb`` and ``lsbset`` have been merged
+  ([PR #34](https://github.com/cedricbonhomme/Stegano/pull/34)).
+
+
+### 0.10.2 (2022-01-13)
+
+- Stegano now uses Pillow 9.0.0 (CVE-2022-22815).
+
+
+### 0.10.1 (2021-11-30)
+
+- Stegano now uses OpenCV Python 4.5.4 abd Numpy 1.21.4.
+
+
+### 0.10.0 (2021-11-29)
+
+- new: Implemented Shi-Tomashi corner generator
+  ([PR #32](https://github.com/cedricbonhomme/Stegano/pull/32)).
+  Implemented by thundersparkf (see CONTRIBUTORS.md file).
+
+
+### 0.9.9 (2021-07-02)
+
+- Stegano now uses Pillow 8.3.0.
+
+
+### 0.9.8 (2019-12-20)
+
+- Stegano is now using poetry;
+- minor improvements to the command line.
+
+
+### 0.9.7 (2019-10-27)
+
+- fixed markdown of the previous release.
+
+
+### 0.9.6 (2019-10-27)
+
+- fixed markdown of the previous release;
+
+
+### 0.9.5 (2019-10-27)
+
+- updated dependencies;
+- home page of the project is now: https://github.com/cedricbonhomme/Stegano
+
+
+### 0.9.4 (2019-06-05)
+
+- new: Implemented LFSR generator (with tests and CLI)
+  ([PR #27](https://github.com/cedricbonhomme/Stegano/pull/27))
+- new: Implemented Ackermann generators CLI interface
+  ([PR #26](https://github.com/cedricbonhomme/Stegano/pull/26))
+- new: The Ackermann functions are not actual generators
+  ([#24](https://github.com/cedricbonhomme/Stegano/issues/24))
+- new: add a shift parameter for the lsbmodule
+  ([#25](https://github.com/cedricbonhomme/Stegano/issues/25))
+- fix: lsbset.hide cause .png transparent area lost
+  ([#23](https://github.com/cedricbonhomme/Stegano/issues/23))
+
+
+### 0.9.3 (2019-04-10)
+
+- it is now possible to either pass the location of an image or directly pass
+  an already opened Image.Image to the hide and reveal methods;
+- code re-formatted a bit with black.
+
+
+### 0.9.2 (2019-04-04)
+
+- updated Pillow dependency to version 6.0.0 in order to fix a bug when opening
+  some PNG files (https://github.com/python-pillow/Pillow/issues/3557).
+
+
+### 0.9.1 (2019-03-06)
+
+- updated Pillow dependency in order to fix a bug when opening some PNG files.
+
+
+### 0.9.0 (2018-12-18)
+
+- added the possibility to shift the encoded bits when using the lsbset module.
+
+
+### 0.8.6 (2018-11-05)
+
+- fixed a potential security issue related to CVE-2018-18074.
+
+
+### 0.8.5 (2018-04-18)
+
+- Fixed an encoding problem which occured on Windows during the installation
+  of the module.
+
+
+### 0.8.4 (2018-02-28)
+
+- Stegano is ready for use with pipenv and pipsi.
+
+
+### 0.8.3 (2018-02-23)
+
+- the recommended way to install Stegano is now to use pipenv.
+
+
+### 0.8.2 (2017-12-20)
+
+- Fixed a bug with the new 'encoding' function when using Stegano as a command
+  line tool. No default value was set. Default value is UTF-8.
+
+
+### 0.8.1 (2017-05-16)
+
+- it is now possible to specify the encoding (UTF-8 or UTF-32LE) of the message
+  to hide/reveal through the command line;
+- the help of the command line now displays the available choices for the
+  arguments, if it is necessary (list of available encodings, list of available
+  generators);
+- tests expected results lies now in a dedicated folder;
+- a script has been added in order to get proper exit code check for mypy.
+
+
+### 0.8 (2017-05-06)
+
+- updated command line. All commands are now prefixed with *stegano-*;
+- improved type hints;
+- it is possible to load and save images from and to file objects (BytesIO);
+- improved checks when revealing a message with the lsbset module fails.
+
+
+### 0.7.1 (2017-05-05)
+
+- improved generators for the lsb-set module;
+- improved tests for the generators;
+- improved type hints.
+
+
+### 0.7 (2017-05-04)
+
+- unicode is now supported. By default UTF-8 encoding is used. UTF-32LE can also
+  be used to hide non-ASCII characters. UTF-8 (8 bits) is the default choice
+  since it is possible to hide longer messages with it.
+- improved checks with type hints.
+
+
+### 0.6.9 (2017-03-10)
+
+- introduces some type hints (PEP 484);
+- more tests for the generators and for the tools module;
+- updated descriptions of generators;
+- fixed a bug with a generator that has been previously renamed.
+
+
+### 0.6.8 (2017-03-08)
+
+- bugfix: fixed #12: Error when revealing a hidden binary file in an image.
+
+
+### 0.6.7 (2017-02-21)
+
+- bugfix: added missing dependency in the setup.py file.
+
+
+### 0.6.6 (2017-02-20)
+
+- improved docstrings for the desciption of the generators;
+- improved the command which displays the list of generators.
+
+
+### 0.6.5 (2017-02-16)
+
+- added a command to list all available generators for the lsb-set module;
+- test when the data image is coming via byte stream, for the lsb module.
+
+
+### 0.6.4 (2017-02-06)
+
+- a command line for the 'red' module has been added;
+- bugfix: fixed a bug in the lsb-set command line when the generator wasn't
+  specified by the user.
+
+
+### 0.6.3 (2017-01-29)
+
+- Support for transparent PNG images has been added (lsb and lsbset modules).
+
+
+### 0.6.2 (2017-01-19)
+
+- bugfix: solved a bug when the image data is coming via byte streams (ByteIO),
+  for the exifHeader hiding method.
+
+
+### 0.6.1 (2016-08-25)
+
+- reorganization of the steganalysis sub-module.
+
+
+### 0.6 (2016-08-04)
+
+- improvements of the command line of Stéganô. The use of Stéganô through the
+  command line has slightly changed ('hide' and 'reveal' are now sub-parameters
+  of the command line). No changes if you use Stéganô as a module in your
+  software. The documentation has been updated accordingly.
+
+
+### 0.5.5 (2016-08-03)
+
+- bugfix: Incorrect padding size in `base642string` in tools.base642binary().
+
+
+### 0.5.4 (2016-05-22)
+
+- the generator provided to the functions lsbset.hide() and lsbset.reveal() is
+  now a function. This is more convenient for a user who wants to use a custom
+  generator (not in the module lsbset.generators).
+- performance improvements for the lsb and lsbset modules.
+
+
+### 0.5.3 (2016-05-19)
+
+- reorganization of all modules. No impact for the users of Stegano.
+
+
+### 0.5.2 (2016-05-18)
+
+- improvements and bug fixes for the exifHeader module;
+- added unit tests for the exifHeader module;
+- improvements of the documentation.
+
+
+### 0.5.1 (2016-04-16)
+
+- minor improvements and bug fixes;
+- added unit tests for the slsb and slsbset modules.
+
+
+### 0.5 (2016-03-18)
+
+- management of greyscale images.
+
+
+### 0.4.6 (2016-03-12)
+
+- bugfix when the length of the message to hide is not divisible by 3,
+  for the slsb and slsbset module.
+
+
+### 0.4.5 (2015-12-23)
+
+- bugfix.
+
+
+### 0.4.4 (2015-12-23)
+
+- new project home page;
+- minor updated to the documentation.
+
+
+### 0.4.3 (2015-10-06)
+
+- bug fixes for Python 3;
+- bug fixes in the scripts in *./bin*.
+
+
+### 0.4.2 (2015-10-05)
+
+- first stable release on PypI.
+
+
+### 0.4 (2012-01-02)
+
+This release introduces a more advanced LSB (Least Significant Bit) method
+based on integers sets. The sets generated with Python generators
+(Sieve of Eratosthenes, Fermat, Carmichael numbers, etc.) are used to select
+the pixels used to hide the information. You can use these new methods in your
+Python codes as a Python module or as a program in your scripts.
+
+
+### 0.3 (2011-04-15)
+
+- you can now use Stéganô as a library in your Python program;
+  (python setup.py install) or as a 'program' thanks to the scripts provided
+  in the bin directory;
+- new documentation (reStructuredText) comes with Stéganô.
+
+
+### 0.2 (2011-03-24)
+
+- this release introduces some bugfixes and a major speed improvement of the
+  *reveal* function for the LSB method. Moreover it is now possible to hide a
+  binary file (ogg, executable, etc.);
+- a new technique for hiding/revealing a message in a JPEG picture by using the
+  description field of the image is provided.

CHANGELOG.rst

@@ -1,161 +0,0 @@
-Release History
-===============
-
-0.7 (not yet released)
-----------------------
-
-* unicode is now supported. By default UTF-8 encoding is used. UTF-32LE can also
-  be used to hide non-ASCII characters. UTF-8 (8 bits) is the default choice
-  since it is possible to hide longer messages with it.
-* improved checks with type hints.
-
-0.6.9 (2017-03-10)
-------------------
-
-* introduces some type hints (PEP 484);
-* more tests for the generators and for the tools module;
-* updated descriptions of generators;
-* fixed a bug with a generator that has been previously renamed.
-
-0.6.8 (2017-03-08)
-------------------
-
-* bugfix: fixed #12: Error when revealing a hidden binary file in an image.
-
-0.6.7 (2017-02-21)
-------------------
-
-* bugfix: added missing dependency in the setup.py file.
-
-0.6.6 (2017-02-20)
-------------------
-
-* improved docstrings for the desciption of the generators;
-* improved the command which displays the list of generators.
-
-0.6.5 (2017-02-16)
-------------------
-
-* added a command to list all available generators for the lsb-set module;
-* test when the data image is coming via byte stream, for the lsb module.
-
-
-0.6.4 (2017-02-06)
-------------------
-
-* a command line for the 'red' module has been added;
-* bugfix: fixed a bug in the lsb-set command line when the generator wasn't
-  specified by the user.
-
-0.6.3 (2017-01-29)
-------------------
-
-* Support for transparent PNG images has been added (lsb and lsbset modules).
-
-0.6.2 (2017-01-19)
-------------------
-
-* bugfix: solved a bug when the image data is coming via byte streams (ByteIO),
-  for the exifHeader hiding method.
-
-0.6.1 (2016-08-25)
-------------------
-
-* reorganization of the steganalysis sub-module.
-
-0.6 (2016-08-04)
-------------------
-
-* improvements of the command line of Stéganô. The use of Stéganô through the
-  command line has slightly changed ('hide' and 'reveal' are now sub-parameters
-  of the command line). No changes if you use Stéganô as a module in your
-  software. The documentation has been updated accordingly.
-
-0.5.5 (2016-08-03)
-------------------
-
-* bugfix: Incorrect padding size in `base642string` in tools.base642binary().
-
-0.5.4 (2016-05-22)
-------------------
-
-* the generator provided to the functions lsbset.hide() and lsbset.reveal() is
-  now a function. This is more convenient for a user who wants to use a custom
-  generator (not in the module lsbset.generators).
-* performance improvements for the lsb and lsbset modules.
-
-0.5.3 (2016-05-19)
-------------------
-
-* reorganization of all modules. No impact for the users of Stegano.
-
-0.5.2 (2016-05-18)
-------------------
-
-* improvements and bug fixes for the exifHeader module;
-* added unit tests for the exifHeader module;
-* improvements of the documentation.
-
-0.5.1 (2016-04-16)
-------------------
-
-* minor improvements and bug fixes;
-* added unit tests for the slsb and slsbset modules.
-
-0.5 (2016-03-18)
-----------------
-
-* management of greyscale images.
-
-0.4.6 (2016-03-12)
-------------------
-
-* bugfix when the length of the message to hide is not divisible by 3,
-  for the slsb and slsbset module.
-
-0.4.5 (2015-12-23)
-------------------
-* bugfix.
-
-0.4.4 (2015-12-23)
-------------------
-
-* new project home page;
-* minor updated to the documentation.
-
-0.4.3 (2015-10-06)
-------------------
-
-* bug fixes for Python 3;
-* bug fixes in the scripts in *./bin*.
-
-0.4.2 (2015-10-05)
-------------------
-
-* first stable release on PypI.
-
-0.4 (2012-01-02)
-----------------
-
-This release introduces a more advanced LSB (Least Significant Bit) method
-based on integers sets. The sets generated with Python generators
-(Sieve of Eratosthenes, Fermat, Carmichael numbers, etc.) are used to select
-the pixels used to hide the information. You can use these new methods in your
-Python codes as a Python module or as a program in your scripts.
-
-0.3 (2011-04-15)
-----------------
-
-* you can now use Stéganô as a library in your Python program;
-  (python setup.py install) or as a 'program' thanks to the scripts provided
-  in the bin directory;
-* new documentation (reStructuredText) comes with Stéganô.
-
-0.2 (2011-03-24)
-----------------
-
-* this release introduces some bugfixes and a major speed improvement of the
-  *reveal* function for the LSB method. Moreover it is now possible to hide a
-  binary file (ogg, executable, etc.);
-* a new technique for hiding/revealing a message in a JPEG picture by using the
-  description field of the image is provided.

CONTRIBUTING.rst

@@ -1,104 +0,0 @@
-Contribution Guidelines
-=======================
-
-Before opening proposing any pull requests (about code or documentation),
-please open an issue.
-
-Code Contributions
-------------------
-
-When contributing code, you'll want to follow this checklist:
-
-1. Fork the repository on GitHub.
-2. Run the tests to confirm they all pass on your system. If they don't, you'll
-   need to investigate why they fail.
-3. Write tests that demonstrate your bug or feature. Ensure that they fail.
-4. Make your change.
-5. Run the entire test suite again, confirming that all tests pass *including
-   the ones you just added*.
-6. Send a GitHub Pull Request to the main repository's ``master`` branch.
-   GitHub Pull Requests are the expected method of code collaboration on this
-   project.
-
-Code Style
-~~~~~~~~~~
-
-Please try to respect the `PEP 8`_ code style.
-
-
-To get the greatest chance of helpful responses, please also observe the
-following additional notes.
-
-.. _PEP 8: http://pep8.org
-
-
-Documentation Contributions
----------------------------
-
-Documentation improvements are always welcome! The documentation files live in
-the ``docs/`` directory of the codebase. They're written in
-`reStructuredText`_, and use `Sphinx`_ to generate the full suite of
-documentation.
-
-When contributing documentation, please do your best to follow the style of the
-documentation files. This means a soft-limit of 79 characters wide in your text
-files and a semi-formal, yet friendly and approachable, prose style.
-
-When presenting Python code, use single-quoted strings (``'hello'`` instead of
-``"hello"``).
-
-.. _reStructuredText: http://docutils.sourceforge.net/rst.html
-.. _Sphinx: http://sphinx-doc.org/index.html
-
-
-
-Good Bug Reports
-----------------
-
-Please be aware of the following things when filing bug reports:
-
-1. Avoid raising duplicate issues. *Please* use the GitHub issue search feature
-   to check whether your bug report or feature request has been mentioned in
-   the past. Duplicate bug reports and feature requests are a huge maintenance
-   burden on the limited resources of the project. If it is clear from your
-   report that you would have struggled to find the original, that's ok, but
-   if searching for a selection of words in your issue title would have found
-   the duplicate then the issue will likely be closed extremely abruptly.
-2. When filing bug reports about exceptions or tracebacks, please include the
-   *complete* traceback. Partial tracebacks, or just the exception text, are
-   not helpful. Issues that do not contain complete tracebacks may be closed
-   without warning.
-3. Make sure you provide a suitable amount of information to work with. This
-   means you should provide:
-
-   - Guidance on **how to reproduce the issue**. Ideally, this should be a
-     *small* code sample that can be run immediately by the maintainers.
-     Failing that, let us know what you're doing, how often it happens, what
-     environment you're using, etc. Be thorough: it prevents us needing to ask
-     further questions.
-   - Tell us **what you expected to happen**. When we run your example code,
-     what are we expecting to happen? What does "success" look like for your
-     code?
-   - Tell us **what actually happens**. It's not helpful for you to say "it
-     doesn't work" or "it fails". Tell us *how* it fails: do you get an
-     exception? A hang? A non-200 status code? How was the actual result
-     different from your expected result?
-   - Tell us **what version of Stegano you're using**, and
-     **how you installed it**. Different versions of Stegano behave
-     differently and have different bugs.
-
-   If you do not provide all of these things, it will take us much longer to
-   fix your problem. If we ask you to clarify these and you never respond, we
-   will close your issue without fixing it.
-
-
-Questions
-=========
-
-The GitHub issue tracker is for *bug reports* and *feature requests*. Please do
-not use it to ask questions about how to use Stegano. These questions should
-instead be directed to Stack Overflow. Make sure
-that your question is tagged with the `python-stegano` tag when asking it on
-Stack Overflow, to ensure that it is answered promptly and accurately.
-You can search for questions with
-`these tags <http://stackoverflow.com/questions/tagged/python+steganography>`_.

CONTRIBUTORS.md

@@ -0,0 +1,21 @@
+## Owner
+
+
+- Cédric Bonhomme <cedric@cedricbonhomme.org>
+
+
+## Contributors
+
+
+- Adrien Cosson - https://cosson.io
+- Andrew Roberts <andy.roberts.uk@gmail.com>
+- Christophe Goessen - https://github.com/cgoessen
+- Flavien Roux - https://github.com/FlavienRx
+- Maxwell Gerber - https://github.com/maxwellgerber
+- Nejdet Çağdaş Yücesoy <nejdetyucesoy@gmail.com>
+- panni <panni@fragstore.net>
+- Peter Justin <peter@peterjustin.me>
+- thundersparkf - https://github.com/thundersparkf
+- Mickaël Schoentgen <mschoentgen@nuxeo.com>
+
+And thank you to the testers!

CONTRIBUTORS.rst

@@ -1,13 +0,0 @@
-Owner
-=====
-
-- Cédric Bonhomme <cedric@cedricbonhomme.org>
-
-Contributors
-============
-
-- Andrew Roberts <andy.roberts.uk@gmail.com>
-- Nejdet Çağdaş Yücesoy <nejdetyucesoy@gmail.com>
-- panni <panni@fragstore.net>
-
-Thank you to the testers!

COPYING

@@ -671,4 +671,4 @@ into proprietary programs.  If your program is a subroutine library, you
 may consider it more useful to permit linking proprietary applications with
 the library.  If this is what you want to do, use the GNU Lesser General
 Public License instead of this License.  But first, please read
-<http://www.gnu.org/philosophy/why-not-lgpl.html>.
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.

MANIFEST.in

@@ -1,11 +0,0 @@
-#documentation
-recursive-include docs *
-
-# binary files
-recursive-include bin *
-
-#Misc
-include COPYING
-include README.rst
-include CHANGELOG.rst
-include requirements.txt

README.md

@@ -0,0 +1,115 @@
+# Stegano
+
+[![Workflow](https://github.com/cedricbonhomme/Stegano/workflows/Python%20application/badge.svg?style=flat-square)](https://github.com/cedricbonhomme/Stegano/actions?query=workflow%3A%22Python+application%22)
+
+[Stegano](https://github.com/cedricbonhomme/Stegano), a pure Python Steganography
+module.
+
+Steganography is the art and science of writing hidden messages in such a way
+that no one, apart from the sender and intended recipient, suspects the
+existence of the message, a form of security through obscurity. Consequently,
+functions provided by Stegano only hide messages, without encryption.
+Steganography is often used with cryptography.
+
+
+## Installation
+
+
+```bash
+$ poetry install stegano
+```
+
+You will be able to use Stegano in your Python programs.
+
+If you only want to install Stegano as a command line tool:
+
+```bash
+$ pipx install stegano
+```
+
+pipx installs scripts (system wide available) provided by Python packages into
+separate virtualenvs to shield them from your system and each other.
+
+
+## Usage
+
+A [tutorial](https://stegano.readthedocs.io) is available.
+
+
+## Use Stegano as a library in your Python program
+
+If you want to use Stegano in your Python program you just have to import the
+appropriate steganography technique. For example:
+
+```python
+>>> from stegano import lsb
+>>> secret = lsb.hide("./tests/sample-files/Lenna.png", "Hello World")
+>>> secret.save("./Lenna-secret.png")
+>>>
+>>> clear_message = lsb.reveal("./Lenna-secret.png")
+```
+
+
+## Use Stegano as a command line tool
+
+### Hide and reveal a message
+
+```bash
+$ stegano-lsb hide -i ./tests/sample-files/Lenna.png -m "Secret Message" -o Lena1.png
+$ stegano-lsb reveal -i Lena1.png
+Secret Message
+```
+
+
+### Hide the message with the Sieve of Eratosthenes
+
+```bash
+$ stegano-lsb hide -i ./tests/sample-files/Lenna.png -m 'Secret Message' --generator eratosthenes -o Lena2.png
+```
+
+The message will be scattered in the picture, following a set described by the
+Sieve of Eratosthenes. Other sets are available. You can also use your own
+generators.
+
+This will make a steganalysis more complicated.
+
+
+## Running the tests
+
+```bash
+$ python -m unittest discover -v
+```
+
+Running the static type checker:
+
+```bash
+$ mypy stegano
+```
+
+
+## Contributions
+
+Contributions are welcome. If you want to contribute to Stegano I highly
+recommend you to install it in a Python virtual environment with poetry.
+
+
+## Donations
+
+If you wish and if you like Stegano, you can donate via GitHub Sponsors:
+
+[![GitHub Sponsors](https://img.shields.io/github/sponsors/cedricbonhomme)](https://github.com/sponsors/cedricbonhomme)
+
+or with Bitcoin to this address:  
+bc1q56u6sj7cvlwu58v5lemljcvkh7v2gc3tv8mj0e
+
+Thank you !
+
+
+## License
+
+This software is licensed under
+[GNU General Public License version 3](https://www.gnu.org/licenses/gpl-3.0.html)
+
+Copyright (C) 2010-2025 [Cédric Bonhomme](https://www.cedricbonhomme.org)
+
+For more information, [the list of authors and contributors](CONTRIBUTORS.md) is available.

README.rst

@@ -1,97 +0,0 @@
-Stéganô
-=======
-
-.. image:: https://img.shields.io/pypi/pyversions/Stegano.svg?style=flat-square
-    :target: https://pypi.python.org/pypi/Stegano
-
-.. image:: https://img.shields.io/pypi/v/Stegano.svg?style=flat-square
-    :target: https://github.com/cedricbonhomme/Stegano/releases/latest
-
-.. image:: https://img.shields.io/pypi/l/Stegano.svg?style=flat-square
-    :target: https://www.gnu.org/licenses/gpl-3.0.html
-
-.. image:: https://img.shields.io/travis/cedricbonhomme/Stegano/master.svg?style=flat-square
-    :target: https://travis-ci.org/cedricbonhomme/Stegano
-
-.. image:: https://img.shields.io/coveralls/cedricbonhomme/Stegano/master.svg?style=flat-square
-   :target: https://coveralls.io/github/cedricbonhomme/Stegano?branch=master
-
-.. image:: https://img.shields.io/github/stars/cedricbonhomme/Stegano.svg?style=flat-square
-    :target: https://github.com/cedricbonhomme/Stegano/stargazers
-
-.. image:: https://img.shields.io/badge/SayThanks.io-%E2%98%BC-1EAEDB.svg?style=flat-square
-    :target: https://saythanks.io/to/cedricbonhomme
-
-
-`Stéganô <https://github.com/cedricbonhomme/Stegano>`_, a pure Python
-Steganography module.
-
-
-Installation
-------------
-
-.. code:: bash
-
-    $ sudo pip install Stegano
-
-You will be able to use Stéganô in your Python programs or as a command line
-tool.
-
-
-Usage
------
-
-A `tutorial <https://stegano.readthedocs.io>`_ is available.
-
-
-Use Stéganô as a library in your Python program
-'''''''''''''''''''''''''''''''''''''''''''''''
-
-If you want to use Stéganô in your Python program you just have to import the
-appropriate steganography technique. For example:
-
-.. code:: python
-
-    >>> from stegano import lsb
-    >>> secret = lsb.hide("./tests/sample-files/Lenna.png", "Hello World")
-    >>> secret.save("./Lenna-secret.png")
-
-
-Use Stéganô as a program
-''''''''''''''''''''''''
-
-Hide a message
-~~~~~~~~~~~~~~
-
-
-.. code:: bash
-
-    $ lsb hide -i ./tests/sample-files/Lenna.png -m "Secret Message" -o Lena1.png
-
-
-Hide the message with the Sieve of Eratosthenes
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-.. code:: bash
-
-    $ lsb-set hide -i ./tests/sample-files/Lenna.png -m 'Secret Message' --generator eratosthenes -o Lena2.png
-
-The message will be scattered in the picture, following a set described by the
-Sieve of Eratosthenes. Other sets are available. You can also use your own
-generators.
-
-This will make a steganalysis more complicated.
-
-
-Running the tests
------------------
-
-.. code:: bash
-
-    $ python -m unittest discover -v
-
-
-Contact
--------
-
-`Cédric Bonhomme <https://www.cedricbonhomme.org>`_

bin/lsb

@@ -1,88 +0,0 @@
-#!/usr/bin/env python
-#-*- coding: utf-8 -*-
-
-# Stéganô - Stéganô is a basic Python Steganography module.
-# Copyright (C) 2010-2017  Cédric Bonhomme - https://www.cedricbonhomme.org
-#
-# For more information : https://github.com/cedricbonhomme/Stegano
-#
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>
-
-__author__ = "Cedric Bonhomme"
-__version__ = "$Revision: 0.6 $"
-__date__ = "$Date: 2016/08/04 $"
-__license__ = "GPLv3"
-
-try:
-    from stegano import lsb
-except:
-    print("Install Stegano: sudo pip install Stegano")
-
-from stegano import tools
-
-import argparse
-parser = argparse.ArgumentParser(prog='lsb')
-subparsers = parser.add_subparsers(help='sub-command help', dest='command')
-
-# Subparser: Hide
-parser_hide = subparsers.add_parser('hide', help='hide help')
-# Original image
-parser_hide.add_argument("-i", "--input", dest="input_image_file",
-                required=True, help="Input image file.")
-
-group_secret = parser_hide.add_mutually_exclusive_group(required=True)
-# Non binary secret message to hide
-group_secret.add_argument("-m", dest="secret_message",
-                help="Your secret message to hide (non binary).")
-# Binary secret message to hide
-group_secret.add_argument("-f", dest="secret_file",
-                help="Your secret to hide (Text or any binary file).")
-
-# Image containing the secret
-parser_hide.add_argument("-o", "--output", dest="output_image_file",
-                required=True, help="Output image containing the secret.")
-
-
-# Subparser: Reveal
-parser_reveal = subparsers.add_parser('reveal', help='reveal help')
-parser_reveal.add_argument("-i", "--input", dest="input_image_file",
-                required=True, help="Input image file.")
-parser_reveal.add_argument("-o", dest="secret_binary",
-                help="Output for the binary secret (Text or any binary file).")
-
-
-arguments = parser.parse_args()
-
-
-if arguments.command == 'hide':
-    if arguments.secret_message != None:
-        secret = arguments.secret_message
-    elif arguments.secret_file != None:
-        secret = tools.binary2base64(arguments.secret_file)
-
-    img_encoded = lsb.hide(arguments.input_image_file, secret)
-    try:
-        img_encoded.save(arguments.output_image_file)
-    except Exception as e:
-        # If hide() returns an error (Too long message).
-        print(e)
-
-elif arguments.command == 'reveal':
-    secret = lsb.reveal(arguments.input_image_file)
-    if arguments.secret_binary != None:
-        data = tools.base642binary(secret)
-        with open(arguments.secret_binary, "wb") as f:
-            f.write(data)
-    else:
-        print(secret)

bin/lsb-set

@@ -1,128 +0,0 @@
-#!/usr/bin/env python
-#-*- coding: utf-8 -*-
-
-# Stéganô - Stéganô is a basic Python Steganography module.
-# Copyright (C) 2010-2017  Cédric Bonhomme - https://www.cedricbonhomme.org
-#
-# For more information : https://github.com/cedricbonhomme/Stegano
-#
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>
-
-__author__ = "Cedric Bonhomme"
-__version__ = "$Revision: 0.6 $"
-__date__ = "$Date: 2016/03/18 $"
-__revision__ = "$Date: 2016/08/04 $"
-__license__ = "GPLv3"
-
-import crayons
-
-try:
-    from stegano import lsbset
-    from stegano.lsbset import generators
-except:
-    print("Install stegano: sudo pip install Stegano")
-
-from stegano import tools
-
-import argparse
-parser = argparse.ArgumentParser(prog='lsb-set')
-subparsers = parser.add_subparsers(help='sub-command help', dest='command')
-
-# Subparser: Hide
-parser_hide = subparsers.add_parser('hide', help='hide help')
-# Original image
-parser_hide.add_argument("-i", "--input", dest="input_image_file",
-                required=True, help="Input image file.")
-
-# Generator
-parser_hide.add_argument("-g", "--generator", dest="generator_function",
-                required=True, help="Generator")
-
-group_secret = parser_hide.add_mutually_exclusive_group(required=True)
-# Non binary secret message to hide
-group_secret.add_argument("-m", dest="secret_message",
-                help="Your secret message to hide (non binary).")
-# Binary secret message to hide
-group_secret.add_argument("-f", dest="secret_file",
-                help="Your secret to hide (Text or any binary file).")
-
-# Image containing the secret
-parser_hide.add_argument("-o", "--output", dest="output_image_file",
-                required=True, help="Output image containing the secret.")
-
-
-# Subparser: Reveal
-parser_reveal = subparsers.add_parser('reveal', help='reveal help')
-parser_reveal.add_argument("-i", "--input", dest="input_image_file",
-                required=True, help="Input image file.")
-parser_reveal.add_argument("-g", "--generator", dest="generator_function",
-                required=True, help="Generator")
-parser_reveal.add_argument("-o", dest="secret_binary",
-                help="Output for the binary secret (Text or any binary file).")
-
-
-# Subparser: List generators
-parser_list_generators = subparsers.add_parser('list-generators',
-                                                help='list-generators help')
-
-arguments = parser.parse_args()
-
-if arguments.command != 'list-generators':
-    try:
-        arguments.generator_function
-    except AttributeError:
-        print('You must specify the name of a generator.')
-        parser.print_help()
-        exit(1)
-
-    try:
-        generator = getattr(generators, arguments.generator_function)()
-    except AttributeError as e:
-        print("Unknown generator: {}".format(arguments.generator_function))
-        exit(1)
-
-if arguments.command == 'hide':
-    if arguments.secret_message != None:
-        secret = arguments.secret_message
-    elif arguments.secret_file != "":
-        secret = tools.binary2base64(arguments.secret_file)
-
-    img_encoded = lsbset.hide(arguments.input_image_file, secret, generator)
-    try:
-        img_encoded.save(arguments.output_image_file)
-    except Exception as e:
-        # If hide() returns an error (Too long message).
-        print(e)
-
-elif arguments.command == 'reveal':
-    try:
-        secret = lsbset.reveal(arguments.input_image_file, generator)
-    except IndexError:
-        print("Impossible to detect message.")
-        exit(0)
-    if arguments.secret_binary != None:
-        data = tools.base642binary(secret)
-        with open(arguments.secret_binary, "w") as f:
-            f.write(data)
-    else:
-        print(secret)
-
-elif arguments.command == 'list-generators':
-    import inspect
-    all_generators = inspect.getmembers(generators, inspect.isfunction)
-    for generator in all_generators:
-        print('Generator id:')
-        print('    {}'.format(crayons.green(generator[0], bold=True)))
-        print('Desciption:')
-        print('    {}'.format(generator[1].__doc__))

bin/stegano-red

@@ -1,56 +0,0 @@
-#!/usr/bin/env python
-# -*- coding: utf-8 -*-
-
-# Stéganô - Stéganô is a basic Python Steganography module.
-# Copyright (C) 2010-2017  Cédric Bonhomme - https://www.cedricbonhomme.org
-#
-# For more information : https://github.com/cedricbonhomme/Stegano
-#
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>
-
-__author__ = "Cedric Bonhomme"
-__version__ = "$Revision: 0.1 $"
-__date__ = "$Date: 2017/02/06 $"
-__license__ = "GPLv3"
-
-try:
-    from stegano import red
-except:
-    print("Install stegano: sudo pip install Stegano")
-
-import argparse
-parser = argparse.ArgumentParser(prog='stegano-red')
-subparsers = parser.add_subparsers(help='sub-command help', dest='command')
-
-parser_hide = subparsers.add_parser('hide', help='hide help')
-parser_hide.add_argument("-i", "--input", dest="input_image_file",
-                help="Image file")
-parser_hide.add_argument("-m", dest="secret_message",
-                help="Your secret message to hide (non binary).")
-parser_hide.add_argument("-o", "--output", dest="output_image_file",
-                help="Image file")
-
-parser_reveal = subparsers.add_parser('reveal', help='reveal help')
-parser_reveal.add_argument("-i", "--input", dest="input_image_file",
-                help="Image file")
-
-arguments = parser.parse_args()
-
-if arguments.command == 'hide':
-    secret = red.hide(arguments.input_image_file, arguments.secret_message)
-    secret.save(arguments.output_image_file)
-
-elif arguments.command == 'reveal':
-    secret = red.reveal(arguments.input_image_file)
-    print(secret)

docs/conf.py

@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 #
 # Stéganô documentation build configuration file, created by
 # sphinx-quickstart on Wed Jul 25 13:33:39 2012.
@@ -10,233 +9,162 @@
 #
 # All configuration values have a default; values that are commented out
 # serve to show the default.
-
-import sys, os
-
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.
-#sys.path.insert(0, os.path.abspath('.'))
-
+# sys.path.insert(0, os.path.abspath('.'))
 # -- General configuration -----------------------------------------------------
-
 # If your documentation needs a minimal Sphinx version, state it here.
-#needs_sphinx = '1.0'
-
+# needs_sphinx = '1.0'
 # Add any Sphinx extension module names here, as strings. They can be extensions
 # coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
 extensions = []
 
 # Add any paths that contain templates here, relative to this directory.
-templates_path = ['_templates']
+templates_path = ["_templates"]
 
 # The suffix of source filenames.
-source_suffix = '.rst'
+source_suffix = ".rst"
 
 # The encoding of source files.
-#source_encoding = 'utf-8-sig'
+# source_encoding = 'utf-8-sig'
 
 # The master toctree document.
-master_doc = 'index'
+master_doc = "index"
 
 # General information about the project.
-project = u'Stéganô'
-copyright = u'2012-2017, Cédric Bonhomme'
+project = "Stegano"
+copyright = "2010-2025, Cédric Bonhomme"
+author = "Cédric Bonhomme <cedric@cedricbonhomme.org>"
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
 # built documents.
 #
 # The short X.Y version.
-version = '0.7'
+version = "0.11"
 # The full version, including alpha/beta/rc tags.
-release = '0.7'
+release = "0.11.0"
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
-#language = None
+# language = None
 
 # There are two options for replacing |today|: either, you set today to some
 # non-false value, then it is used:
-#today = ''
+# today = ''
 # Else, today_fmt is used as the format for a strftime call.
-#today_fmt = '%B %d, %Y'
+# today_fmt = '%B %d, %Y'
 
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.
-exclude_patterns = ['_build']
+exclude_patterns = ["_build"]
 
 # The reST default role (used for this markup: `text`) to use for all documents.
-#default_role = None
+# default_role = None
 
 # If true, '()' will be appended to :func: etc. cross-reference text.
-#add_function_parentheses = True
+# add_function_parentheses = True
 
 # If true, the current module name will be prepended to all description
 # unit titles (such as .. function::).
-#add_module_names = True
+# add_module_names = True
 
 # If true, sectionauthor and moduleauthor directives will be shown in the
 # output. They are ignored by default.
-#show_authors = False
-
-# The name of the Pygments (syntax highlighting) style to use.
-pygments_style = 'sphinx'
+# show_authors = False
 
 # A list of ignored prefixes for module index sorting.
-#modindex_common_prefix = []
+# modindex_common_prefix = []
 
 
 # -- Options for HTML output ---------------------------------------------------
 
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
-html_theme = 'bizstyle'
+html_theme = "sphinx_rtd_theme"
 
 # Theme options are theme-specific and customize the look and feel of a theme
 # further.  For a list of options available for each theme, see the
 # documentation.
-#html_theme_options = {}
+# html_theme_options = {}
 
 # Add any paths that contain custom themes here, relative to this directory.
-#html_theme_path = []
+# html_theme_path = []
 
 # The name for this set of Sphinx documents.  If None, it defaults to
 # "<project> v<release> documentation".
-#html_title = None
+# html_title = None
 
 # A shorter title for the navigation bar.  Default is the same as html_title.
-#html_short_title = None
+# html_short_title = None
 
 # The name of an image file (relative to this directory) to place at the top
 # of the sidebar.
-#html_logo = None
+# html_logo = None
 
 # The name of an image file (within the static path) to use as favicon of the
 # docs.  This file should be a Windows icon file (.ico) being 16x16 or 32x32
 # pixels large.
-#html_favicon = None
+# html_favicon = None
 
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,
 # so a file named "default.css" will overwrite the builtin "default.css".
-html_static_path = ['_static']
+html_static_path = ["_static"]
 
 # If not '', a 'Last updated on:' timestamp is inserted at every page bottom,
 # using the given strftime format.
-#html_last_updated_fmt = '%b %d, %Y'
+# html_last_updated_fmt = '%b %d, %Y'
 
 # If true, SmartyPants will be used to convert quotes and dashes to
 # typographically correct entities.
-#html_use_smartypants = True
+# html_use_smartypants = True
 
 # Custom sidebar templates, maps document names to template names.
-#html_sidebars = {}
+# html_sidebars = {}
 
 # Additional templates that should be rendered to pages, maps page names to
 # template names.
-#html_additional_pages = {}
+# html_additional_pages = {}
 
 # If false, no module index is generated.
-#html_domain_indices = True
-
-# If false, no index is generated.
-html_use_index = False
+# html_domain_indices = True
 
 # If true, the index is split into individual pages for each letter.
-#html_split_index = False
+# html_split_index = False
 
 # If true, links to the reST sources are added to the pages.
-#html_show_sourcelink = True
+# html_show_sourcelink = True
 
 # If true, "Created using Sphinx" is shown in the HTML footer. Default is True.
-#html_show_sphinx = True
+# html_show_sphinx = True
 
 # If true, "(C) Copyright ..." is shown in the HTML footer. Default is True.
-#html_show_copyright = True
+# html_show_copyright = True
 
 # If true, an OpenSearch description file will be output, and all pages will
 # contain a <link> tag referring to it.  The value of this option must be the
 # base URL from which the finished HTML is served.
-#html_use_opensearch = ''
+# html_use_opensearch = ''
 
 # This is the file name suffix for HTML files (e.g. ".xhtml").
-#html_file_suffix = None
-
-# Output file base name for HTML help builder.
-htmlhelp_basename = 'Stgandoc'
+# html_file_suffix = None
 
 
 # -- Options for LaTeX output --------------------------------------------------
 
-latex_elements = {
-# The paper size ('letterpaper' or 'a4paper').
-#'papersize': 'letterpaper',
-
-# The font size ('10pt', '11pt' or '12pt').
-#'pointsize': '10pt',
-
-# Additional stuff for the LaTeX preamble.
-#'preamble': '',
-}
+latex_engine = "pdflatex"
 
 # Grouping the document tree into LaTeX files. List of tuples
 # (source start file, target name, title, author, documentclass [howto/manual]).
 latex_documents = [
-  ('index', 'Stgan.tex', u'Stéganô Documentation',
-   u'Cédric Bonhomme', 'manual'),
+    ("index", "Stgan.tex", "Stegano Documentation", "Cédric Bonhomme", "howto"),
 ]
 
-# The name of an image file (relative to this directory) to place at the top of
-# the title page.
-#latex_logo = None
+latex_show_urls = True
+latex_show_pagerefs = True
 
-# For "manual" documents, if this is true, then toplevel headings are parts,
-# not chapters.
-#latex_use_parts = False
-
-# If true, show page references after internal links.
-#latex_show_pagerefs = False
-
-# If true, show URL addresses after external links.
-#latex_show_urls = False
-
-# Documents to append as an appendix to all manuals.
-#latex_appendices = []
-
-# If false, no module index is generated.
-#latex_domain_indices = True
-
-
-# -- Options for manual page output --------------------------------------------
-
-# One entry per manual page. List of tuples
-# (source start file, name, description, authors, manual section).
-man_pages = [
-    ('index', 'stgan', u'Stéganô Documentation',
-     [u'Cédric Bonhomme'], 1)
-]
-
-# If true, show URL addresses after external links.
-#man_show_urls = False
-
-
-# -- Options for Texinfo output ------------------------------------------------
-
-# Grouping the document tree into Texinfo files. List of tuples
-# (source start file, target name, title, author,
-#  dir menu entry, description, category)
-texinfo_documents = [
-  ('index', 'Stgan', u'Stéganô Documentation',
-   u'Cédric Bonhomme', 'Stgan', 'One line description of project.',
-   'Miscellaneous'),
-]
-
-# Documents to append as an appendix to all manuals.
-#texinfo_appendices = []
-
-# If false, no module index is generated.
-#texinfo_domain_indices = True
-
-# How to display URL addresses: 'footnote', 'no', or 'inline'.
-#texinfo_show_urls = 'footnote'
+ADDITIONAL_PREAMBLE = r"""
+\setcounter{tocdepth}{3}
+"""

docs/index.rst

@@ -6,33 +6,15 @@
 Presentation
 ============
 
-.. image:: https://img.shields.io/pypi/pyversions/Stegano.svg?style=flat-square
-    :target: https://pypi.python.org/pypi/Stegano
-
-.. image:: https://img.shields.io/pypi/v/Stegano.svg?style=flat-square
-    :target: https://github.com/cedricbonhomme/Stegano/releases/latest
-
-.. image:: https://img.shields.io/pypi/l/Stegano.svg?style=flat-square
-    :target: https://www.gnu.org/licenses/gpl-3.0.html
-
-.. image:: https://img.shields.io/travis/cedricbonhomme/Stegano.svg?style=flat-square
-    :target: https://travis-ci.org/cedricbonhomme/Stegano
-
-.. image:: https://img.shields.io/github/stars/cedricbonhomme/Stegano.svg?maxAge=2592000&style=flat-square
-    :target: https://github.com/cedricbonhomme/Stegano/stargazers
-
-.. image:: https://img.shields.io/badge/SayThanks.io-%E2%98%BC-1EAEDB.svg?style=flat-square
-    :target: https://saythanks.io/to/cedricbonhomme
-
-Stéganô_ is a pure Python steganography_ module.
+Stegano_ is a pure Python steganography_ module.
 
 Steganography is the art and science of writing hidden messages in such a way
 that no one, apart from the sender and intended recipient, suspects the
 existence of the message, a form of security through obscurity.
-Consequently, functions provided by Stéganô only hide messages,
+Consequently, functions provided by Stegano only hide messages,
 without encryption. Steganography is often used with cryptography.
 
-Stéganô implements these methods of hiding:
+Stegano implements these methods of hiding:
 
 - using the red portion of a pixel to hide ASCII messages;
 - using the `Least Significant Bit <http://en.wikipedia.org/wiki/Least_significant_bit>`_ (LSB) technique;
@@ -44,6 +26,8 @@ Moreover some methods of steganalysis_ are provided:
 - steganalysis of LSB encoding in color images;
 - statistical steganalysis.
 
+You can also use Stegano through a `Web service <https://github.com/cedricbonhomme/stegano-web>`_.
+Not all functionalities of Stegano are covered.
 
 Requirements
 ============
@@ -53,7 +37,7 @@ Requirements
 - `piexif`_.
 
 
-Turorial
+Tutorial
 ========
 
 .. toctree::
@@ -64,21 +48,21 @@ Turorial
     software
     steganalysis
 
-You can also have a look at the
+You can have a look at the
 `unit tests <https://github.com/cedricbonhomme/Stegano/tree/master/tests>`_.
 
 
 License
 =======
 
-Stéganô_ is under GPL v3 license.
+Stegano_ is under GPL v3 license.
 
 
 Donation
 ========
 
-If you wish and if you like Stéganô, you can donate via bitcoin.
-My bitcoin address: `1GVmhR9fbBeEh7rP1qNq76jWArDdDQ3otZ <http://blockexplorer.com/address/1GVmhR9fbBeEh7rP1qNq76jWArDdDQ3otZ>`_
+If you wish and if you like Stegano, you can
+`donate <https://github.com/sponsors/cedricbonhomme>`_.
 
 
 
@@ -89,7 +73,7 @@ Contact
 
 
 .. _Python: https://www.python.org
-.. _Stéganô: https://github.com/cedricbonhomme/Stegano
+.. _Stegano: https://github.com/cedricbonhomme/Stegano
 .. _`Pillow`: https://pypi.python.org/pypi/Pillow
 .. _`piexif`: https://pypi.python.org/pypi/piexif
 .. _steganography: http://en.wikipedia.org/wiki/Steganography

docs/installation.rst

@@ -3,16 +3,13 @@ Installation
 
 .. code-block:: bash
 
-    $ sudo pip install Stegano
+    $ poetry install Stegano
 
-You will be able to use Stéganô in your Python programs
+You will be able to use Stegano in your Python programs
 or as a command line tool.
 
 If you want to retrieve the source code (with the unit tests):
 
 .. code-block:: bash
 
-    $ git clone https://github.com/cedricbonhomme/Stegano.git
-
-.. image:: https://api.travis-ci.org/cedricbonhomme/Stegano.svg?branch=master
-    :target: https://travis-ci.org/cedricbonhomme/Stegano
+    $ git clone https://github.com/cedricbonhomme/Stegano

docs/module.rst

@@ -1,13 +1,15 @@
-Using Stéganô as a Python module
+Using Stegano as a Python module
 ================================
 
+You can find more examples in the
+`unit tests directory <https://github.com/cedricbonhomme/Stegano/tree/master/tests>`_.
+
 LSB method
 ----------
 
 .. code-block:: python
 
-    Python 3.5.1 (default, Dec  7 2015, 11:33:57)
-    [GCC 4.9.2] on linux
+    Python 3.11.0 (main, Oct 31 2022, 15:15:22) [GCC 12.2.0] on linux
     Type "help", "copyright", "credits" or "license" for more information.
     >>> from stegano import lsb
     >>> secret = lsb.hide("./tests/sample-files/Lenna.png", "Hello world!")
@@ -24,29 +26,33 @@ Sets are used in order to select the pixels where the message will be hidden.
 
 .. code-block:: python
 
-    Python 3.5.1 (default, Dec  7 2015, 11:33:57)
-    [GCC 4.9.2] on linux
+    Python 3.11.0 (main, Oct 31 2022, 15:15:22) [GCC 12.2.0] on linux
     Type "help", "copyright", "credits" or "license" for more information.
-    >>> from stegano import lsbset
-    >>> from stegano.lsbset import generators
+    >>> from stegano import lsb
+    >>> from stegano.lsb import generators
 
     # Hide a secret with the Sieve of Eratosthenes
     >>> secret_message = "Hello World!"
-    >>> secret_image = lsbset.hide("./tests/sample-files/Lenna.png",
-                                    secret_message,
-                                    generators.eratosthenes())
+    >>> secret_image = lsb.hide("./tests/sample-files/Lenna.png", secret_message, generators.eratosthenes())
     >>> secret_image.save("./image.png")
 
     # Try to decode with another generator
-    >>> message = lsbset.reveal("./image.png", generators.fibonacci())
+    >>> message = lsb.reveal("./image.png", generators.fibonacci())
     Traceback (most recent call last):
-      File "<stdin>", line 1, in <module>
-      File "/home/cedric/projects/Stegano/stegano/lsbset/lsbset.py", line 111, in reveal
-        for color in img_list[generated_number]:
-    IndexError: list index out of range
+    File "/Users/flavien/.local/share/virtualenvs/Stegano-sY_cwr69/bin/stegano-lsb", line 6, in <module>
+        sys.exit(main())
+    File "/Users/flavien/Perso/dev/Stegano/bin/lsb.py", line 190, in main
+        img_encoded = lsb.hide(
+    File "/Users/flavien/Perso/dev/Stegano/stegano/lsb/lsb.py", line 63, in hide
+        hider.encode_pixel((col, row))
+    File "/Users/flavien/Perso/dev/Stegano/stegano/tools.py", line 165, in encode_pixel
+        r, g, b, *a = self.encoded_image.getpixel(coordinate)
+    File "/Users/flavien/.local/share/virtualenvs/Stegano-sY_cwr69/lib/python3.10/site-packages/PIL/Image.py", line 1481, in getpixel
+        return self.im.getpixel(xy)
+    IndexError: image index out of range
 
     # Decode with Eratosthenes
-    >>> message = lsbset.reveal("./image.png", generators.eratosthenes())
+    >>> message = lsb.reveal("./image.png", generators.eratosthenes())
     >>> message
     'Hello World!'
 
@@ -91,6 +97,12 @@ Sets are used in order to select the pixels where the message will be hidden.
     syracuse
         Generate the sequence of Syracuse.
 
+    shi_tomashi Shi-Tomachi corner generator of the given points
+        https://docs.opencv.org/4.x/d4/d8c/tutorial_py_shi_tomasi.html
+
+    triangular_numbers Triangular numbers: a(n) = C(n+1,2) = n(n+1)/2 = 0+1+2+...+n.
+        http://oeis.org/A000217
+
 
 
 Description field of the image
@@ -100,8 +112,7 @@ For JPEG and TIFF images.
 
 .. code-block:: python
 
-    Python 3.5.1 (default, Dec  7 2015, 11:33:57)
-    [GCC 4.9.2] on linux
+    Python 3.11.0 (main, Oct 31 2022, 15:15:22) [GCC 12.2.0] on linux
     Type "help", "copyright", "credits" or "license" for more information.
     >>> from stegano import exifHeader
     >>> secret = exifHeader.hide("./tests/sample-files/20160505T130442.jpg",

docs/requirements.txt

@@ -0,0 +1,2 @@
+sphinx
+sphinx_rtd_theme

docs/software.rst

@@ -1,104 +1,158 @@
-Using Stéganô in command line for your scripts
-==============================================
+Using Stegano in command line
+=============================
+
+The command ``stegano-lsb``
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Hide and reveal a message with the LSB method.
 
 Display help
 ------------
 
 .. code-block:: bash
 
-    $ lsb --help
-    usage: lsb [-h] {hide,reveal} ...
+    $ stegano-lsb --help
+    usage: stegano-lsb [-h] {hide,reveal,list-generators} ...
 
     positional arguments:
-      {hide,reveal}  sub-command help
-        hide         hide help
-        reveal       reveal help
+    {hide,reveal,list-generators}
+                            sub-command help
+        hide                hide help
+        reveal              reveal help
+        list-generators     list-generators help
 
-    optional arguments:
-      -h, --help     show this help message and exit
+    options:
+    -h, --help            show this help message and exit
 
 
 .. code-block:: bash
 
-    $ lsb hide --help
-    usage: lsb hide [-h] -i INPUT_IMAGE_FILE (-m SECRET_MESSAGE | -f SECRET_FILE)
-                    -o OUTPUT_IMAGE_FILE
+    $ stegano-lsb hide --help
+    usage: stegano-lsb hide [-h] -i INPUT_IMAGE_FILE [-e {UTF-8,UTF-32LE}] [-g [GENERATOR_FUNCTION ...]] [-s SHIFT] (-m SECRET_MESSAGE | -f SECRET_FILE) -o OUTPUT_IMAGE_FILE
 
-    optional arguments:
-      -h, --help            show this help message and exit
-      -i INPUT_IMAGE_FILE, --input INPUT_IMAGE_FILE
+    options:
+    -h, --help            show this help message and exit
+    -i INPUT_IMAGE_FILE, --input INPUT_IMAGE_FILE
                             Input image file.
-      -m SECRET_MESSAGE     Your secret message to hide (non binary).
-      -f SECRET_FILE        Your secret to hide (Text or any binary file).
-      -o OUTPUT_IMAGE_FILE, --output OUTPUT_IMAGE_FILE
+    -e {UTF-8,UTF-32LE}, --encoding {UTF-8,UTF-32LE}
+                            Specify the encoding of the message to hide. UTF-8 (default) or UTF-32LE.
+    -g [GENERATOR_FUNCTION ...], --generator [GENERATOR_FUNCTION ...]
+                            Generator (with optional arguments)
+    -s SHIFT, --shift SHIFT
+                            Shift for the generator
+    -m SECRET_MESSAGE     Your secret message to hide (non binary).
+    -f SECRET_FILE        Your secret to hide (Text or any binary file).
+    -o OUTPUT_IMAGE_FILE, --output OUTPUT_IMAGE_FILE
                             Output image containing the secret.
 
 
 .. code-block:: bash
 
-    $ lsb reveal --help
-    usage: lsb reveal [-h] -i INPUT_IMAGE_FILE [-o SECRET_BINARY]
+    $ stegano-lsb reveal --help
+    usage: stegano-lsb reveal [-h] -i INPUT_IMAGE_FILE [-e {UTF-8,UTF-32LE}] [-g [GENERATOR_FUNCTION ...]] [-s SHIFT] [-o SECRET_BINARY]
 
-    optional arguments:
-      -h, --help            show this help message and exit
-      -i INPUT_IMAGE_FILE, --input INPUT_IMAGE_FILE
+    options:
+    -h, --help            show this help message and exit
+    -i INPUT_IMAGE_FILE, --input INPUT_IMAGE_FILE
                             Input image file.
-      -o SECRET_BINARY      Output for the binary secret (Text or any binary
-                            file)
+    -e {UTF-8,UTF-32LE}, --encoding {UTF-8,UTF-32LE}
+                            Specify the encoding of the message to reveal. UTF-8 (default) or UTF-32LE.
+    -g [GENERATOR_FUNCTION ...], --generator [GENERATOR_FUNCTION ...]
+                            Generator (with optional arguments)
+    -s SHIFT, --shift SHIFT
+                            Shift for the generator
+    -o SECRET_BINARY      Output for the binary secret (Text or any binary file).
 
 
-Hide and reveal a text message with the LSB method
---------------------------------------------------
+Hide and reveal a text message
+------------------------------
 
 .. code-block:: bash
 
-    $ lsb hide -i ./tests/sample-files/Lenna.png -m 'Hello World!' -o ./Lenna_enc.png
-    $ lsb reveal -i ./Lenna_enc.png
+    $ stegano-lsb hide -i ./tests/sample-files/Lenna.png -m 'Hello World!' -o ./Lenna_enc.png
+    $ stegano-lsb reveal -i ./Lenna_enc.png
     Hello World!
 
+Specify an encoding
+-------------------
+
+.. code-block:: bash
+
+    $ stegano-lsb hide -i ./tests/sample-files/Lenna.png -m 'I love 🍕 and 🍫.' -e UTF-32LE -o ./Lenna_enc.png
+    $ stegano-lsb reveal -i ./Lenna_enc.png
+    I love 🍕 and 🍫.
+
+The default encoding is UTF-8.
+
 Hide and reveal a binary file
 -----------------------------
 
 .. code-block:: bash
 
     $ wget http://www.gnu.org/music/free-software-song.ogg
-    $ lsb hide -i ./tests/sample-files/Montenach.png -f ./free-software-song.ogg -o ./Montenach_enc.png
+    $ stegano-lsb hide -i ./tests/sample-files/Montenach.png -f ./free-software-song.ogg -o ./Montenach_enc.png
     $ rm free-software-song.ogg
-    $ lsb reveal -i ./Montenach_enc.png -o ./song.ogg
+    $ stegano-lsb reveal -i ./Montenach_enc.png -o ./song.ogg
+
 
-Hide and reveal a text message with the LSB method and generated sets
----------------------------------------------------------------------
 
 Sets are used in order to select the pixels where the message will be hidden.
 
+Hide and reveal a text message with set
+---------------------------------------
+
 .. code-block:: bash
 
     # Hide the message with the Sieve of Eratosthenes
-    $ lsb-set hide -i ./tests/sample-files/Montenach.png --generator eratosthenes -m 'Joyeux Noël!' -o ./surprise.png
+    $ stegano-lsb hide -i ./tests/sample-files/Montenach.png --generator eratosthenes -m 'Joyeux Noël!' -o ./surprise.png
 
     # Try to reveal with Mersenne numbers
-    $ lsb-set reveal --generator mersenne -i ./surprise.png
+    $ stegano-lsb reveal --generator mersenne -i ./surprise.png
 
     # Try to reveal with fermat numbers
-    $ lsb-set reveal --generator fermat -i ./surprise.png
+    $ stegano-lsb reveal --generator fermat -i ./surprise.png
 
     # Try to reveal with carmichael numbers
-    $ lsb-set reveal --generator carmichael -i ./surprise.png
+    $ stegano-lsb reveal --generator carmichael -i ./surprise.png
 
     # Try to reveal with Sieve of Eratosthenes
-    $ lsb-set reveal --generator eratosthenes -i ./surprise.png
+    $ stegano-lsb reveal --generator eratosthenes -i ./surprise.png
 
-    # List all available generators
-    $ lsb-set list-generators
+
+Sometimes it can be useful to skip the first values of a set. For example if you want
+to hide several messages or because due to the selected generator
+(Fibonacci starts with 0, 1, 1, etc.). Or maybe you just want to add more complexity.
+In this case, simply use the optional arguments ``--shift`` or ``-s``:
+
+
+.. code-block:: bash
+
+    $ stegano-lsb hide -i ./tests/sample-files/Lenna.png -m 'Shifted secret message' -o ~/Lenna1.png --shift 7
+    $ stegano-lsb reveal -i ~/Lenna1.png --shift 7
+    Shifted secret message
+
+
+List all available generators
+------------------------------
+
+.. code-block:: bash
+
+    $ stegano-lsb list-generators
     Generator id:
         ackermann
     Desciption:
         Ackermann number.
 
+    Generator id:
+        ackermann_naive
+    Desciption:
+        Ackermann number.
+
     Generator id:
         carmichael
     Desciption:
-        Composite numbers n such that a^(n-1) == 1 (mod n) for every a coprime to n.
+        Composite numbers n such that a^(n-1) == 1 (mod n) for every a coprime
+        to n.
         https://oeis.org/A002997
 
     Generator id:
@@ -138,14 +192,9 @@ Sets are used in order to select the pixels where the message will be hidden.
     Generator id:
         mersenne
     Desciption:
-        Generate 2^n - 1.
+        Generate 2^p - 1, where p is prime.
         https://oeis.org/A001348
 
-    Generator id:
-        syracuse
-    Desciption:
-        Generate the sequence of Syracuse.
-
     Generator id:
         triangular_numbers
     Desciption:
@@ -153,28 +202,18 @@ Sets are used in order to select the pixels where the message will be hidden.
         http://oeis.org/A000217
 
 
-An other example:
-
-.. code-block:: bash
-
-    # Hide the message - LSB with a set defined by the identity function (f(x) = x).
-    lsb-set hide -i ./tests/sample-files/Montenach.png --generator identity -m 'I like steganography.' -o ./enc-identity.png
-
-    # Hide the message - LSB only.
-    lsb hide -i ./tests/sample-files/Montenach.png -m 'I like steganography.' -o ./enc.png
-
-    # Check if the two generated files are the same.
-    sha1sum ./enc-identity.png ./enc.png
-
-    # The output of lsb is given to lsb-set.
-    lsb-set reveal -i ./enc.png --generator identity
-
-    # The output of lsb-set is given to lsb.
-    lsb reveal -i ./enc-identity.png
 
 
-Hide and reveal a text message with the red portion of a pixel
---------------------------------------------------------------
+
+
+
+The command ``stegano-red``
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Hide and reveal a text message with the red portion of a pixel.
+
+Display help
+------------
 
 .. code-block:: bash
 
@@ -190,7 +229,11 @@ Hide and reveal a text message with the red portion of a pixel
     -o OUTPUT_IMAGE_FILE, --output OUTPUT_IMAGE_FILE
                         Image file
 
-    $ stegano-red hide -i ./tests/sample-files/Lenna.png -m 'Basic steganography technique.' -o ~/Lenna1.png
+Hide and reveal a text message
+------------------------------
 
+.. code-block:: bash
+
+    $ stegano-red hide -i ./tests/sample-files/Lenna.png -m 'Basic steganography technique.' -o ~/Lenna1.png
     $ stegano-red reveal -i ~/Lenna1.png
     Basic steganography technique.

docs/steganalysis.rst

@@ -7,13 +7,13 @@ Parity
 .. code-block:: bash
 
     # Hide the message  with Sieve of Eratosthenes
-    lsb-set hide -i ./tests/sample-files/20160505T130442.jpg -o ./surprise.png --generator eratosthenes -m 'Very important message.'
+    stegano-lsb hide -i ./tests/sample-files/20160505T130442.jpg -o ./surprise.png --generator eratosthenes -m 'Very important message.'
 
     # Steganalysis of the original photo
-    steganalysis-parity -i ./tests/sample-files/20160505T130442.jpg -o ./surprise_st_original.png
+    stegano-steganalysis-parity -i ./tests/sample-files/20160505T130442.jpg -o ./surprise_st_original.png
 
     # Steganalysis of the secret photo
-    steganalysis-parity -i ./surprise.png -o ./surprise_st_secret.png
+    stegano-steganalysis-parity -i ./surprise.png -o ./surprise_st_secret.png
 
     # Reveal with Sieve of Eratosthenes
-    lsb-set reveal -i ./surprise.png --generator eratosthenes
+    stegano-lsb reveal -i ./surprise.png --generator eratosthenes

pyproject.toml

@@ -0,0 +1,93 @@
+[build-system]
+requires = ["poetry-core>=2.0"]
+build-backend = "poetry.core.masonry.api"
+
+
+[project]
+name = "stegano"
+version = "1.0.1"
+description = "A pure Python Steganography module."
+authors = [
+    {name = "Cédric Bonhomme", email= "cedric@cedricbonhomme.org"}
+]
+license = "GPL-3.0-or-later"
+readme = "README.md"
+keywords = ["Steganography", "Security", "Stegano"]
+
+dynamic = ["classifiers"]
+
+requires-python = ">=3.10,<4.0"
+dependencies = [
+    "pillow (>=9.5,<11.0)",
+    "piexif (>=1.1.3)",
+    "crayons (>=0.4.0)",
+    "opencv-python (>=4.8.1.78)"
+]
+
+[project.urls]
+Homepage = "https://github.com/cedricbonhomme/Stegano"
+Changelog = "https://github.com/cedricbonhomme/Stegano/blob/master/CHANGELOG.md"
+Repository = "https://github.com/cedricbonhomme/Stegano"
+Documentation = "https://stegano.readthedocs.io"
+
+[project.scripts]
+stegano-lsb = "stegano.console.lsb:main"
+stegano-red = "stegano.console.red:main"
+stegano-steganalysis-parity = "stegano.console.parity:main"
+stegano-steganalysis-statistics = "stegano.console.statistics:main"
+
+
+[tool.poetry]
+requires-poetry = ">=2.0"
+classifiers = [
+    "Development Status :: 5 - Production/Stable",
+    "Environment :: Console",
+    "Intended Audience :: Developers",
+    "Intended Audience :: Science/Research",
+    "Topic :: Security",
+    "Operating System :: POSIX :: Linux",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
+    "License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)"
+]
+include = [
+    "README.md",
+    "COPYING",
+    "CHANGELOG.md",
+    "docs/**/*",
+]
+
+
+[tool.poetry.group.dev.dependencies]
+mypy = "^1.8.0"
+flake8 = "^6.0.0"
+nose2 = "^0.14.0"
+Sphinx = "^6.2.1"
+pre-commit = "^3.6.0"
+
+
+[tool.poetry.group.dev]
+optional = true
+
+
+[tool.mypy]
+python_version = "3.12"
+check_untyped_defs = true
+ignore_errors = false
+ignore_missing_imports = true
+strict_optional = true
+no_implicit_optional = true
+warn_unused_ignores = true
+warn_redundant_casts = true
+warn_unused_configs = true
+warn_unreachable = true
+
+show_error_context = true
+pretty = true
+
+exclude = "build|dist|docs|stegano.egg-info"
+
+[tool.isort]
+profile = "black"

requirements.dev.txt

@@ -1,4 +0,0 @@
-pep8
-coverage
-coveralls
-mypy

requirements.txt

@@ -1,3 +0,0 @@
-pillow
-piexif
-crayons

setup.cfg

@@ -1,2 +0,0 @@
-[metadata]
-description-file = README.rst

setup.py

@@ -1,64 +0,0 @@
-#!/usr/bin/python
-# -*- coding: utf-8 -*-
-
-import os
-import sys
-import shutil
-
-try:
-    from setuptools import setup
-except ImportError:
-    from distutils.core import setup
-
-packages = [
-    'stegano',
-    'stegano.red',
-    'stegano.exifHeader',
-    'stegano.lsb',
-    'stegano.lsbset',
-    'stegano.steganalysis'
-]
-
-scripts = [
-    'bin/lsb',
-    'bin/lsb-set',
-    'bin/stegano-red',
-    'bin/steganalysis-parity',
-    'bin/steganalysis-statistics'
-]
-
-requires = ['pillow', 'piexif', 'crayons']
-
-with open('README.rst', 'r') as f:
-    readme = f.read()
-with open('CHANGELOG.rst', 'r') as f:
-    changelog = f.read()
-
-setup(
-    name='Stegano',
-    version='0.7',
-    author='Cédric Bonhomme',
-    author_email='cedric@cedricbonhomme.org',
-    packages=packages,
-    include_package_data=True,
-    scripts=scripts,
-    url='https://github.com/cedricbonhomme/Stegano',
-    description='A pure Python Steganography module.',
-    long_description=readme + '\n|\n\n' + changelog,
-    platforms = ['Linux'],
-    license='GPLv3',
-    install_requires=requires,
-    zip_safe=False,
-    classifiers=[
-        'Development Status :: 5 - Production/Stable',
-        'Environment :: Console',
-        'Intended Audience :: Developers',
-        'Intended Audience :: Science/Research',
-        'Topic :: Security',
-        'Operating System :: OS Independent',
-        'Programming Language :: Python :: 3.4',
-        'Programming Language :: Python :: 3.5',
-        'Programming Language :: Python :: 3.6',
-        'License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)'
-    ]
-)

stegano/__init__.py

@@ -1,9 +1,5 @@
 #!/usr/bin/env python
-# -*- coding: utf-8 -*-
 
-from . import red
-from . import exifHeader
-from . import lsb
-from . import lsbset
+from . import exifHeader, lsb, red, steganalysis
 
-from . import steganalysis
+__all__ = ["red", "exifHeader", "lsb", "steganalysis"]

stegano/console/lsb.py

@@ -0,0 +1,227 @@
+#!/usr/bin/env python
+# Stegano - Stegano is a pure Python steganography module.
+# Copyright (C) 2010-2025 Cédric Bonhomme - https://www.cedricbonhomme.org
+#
+# For more information : https://github.com/cedricbonhomme/Stegano
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>
+
+__author__ = "Cedric Bonhomme"
+__version__ = "$Revision: 0.7 $"
+__date__ = "$Date: 2016/03/18 $"
+__revision__ = "$Date: 2019/06/04 $"
+__license__ = "GPLv3"
+
+import inspect
+
+import crayons
+
+try:
+    from stegano import lsb
+    from stegano.lsb import generators
+except Exception:
+    print("Install stegano: pipx install Stegano")
+
+import argparse
+
+from stegano import tools
+
+
+class ValidateGenerator(argparse.Action):
+    def __call__(self, parser, args, values, option_string=None):
+        valid_generators = [
+            generator[0]
+            for generator in inspect.getmembers(generators, inspect.isfunction)
+        ]
+        # Verify that the generator is valid
+        generator = values[0]
+        if generator not in valid_generators:
+            raise ValueError("Unknown generator: %s" % generator)
+        # Set the generator_function arg of the parser
+        setattr(args, self.dest, values)
+
+
+def main():
+    parser = argparse.ArgumentParser(prog="stegano-lsb")
+    subparsers = parser.add_subparsers(
+        help="sub-command help", dest="command", required=True
+    )
+
+    # Subparser: Hide
+    parser_hide = subparsers.add_parser("hide", help="hide help")
+    # Original image
+    parser_hide.add_argument(
+        "-i",
+        "--input",
+        dest="input_image_file",
+        required=True,
+        help="Input image file.",
+    )
+    parser_hide.add_argument(
+        "-e",
+        "--encoding",
+        dest="encoding",
+        choices=tools.ENCODINGS.keys(),
+        default="UTF-8",
+        help="Specify the encoding of the message to hide."
+        " UTF-8 (default) or UTF-32LE.",
+    )
+
+    # Generator
+    parser_hide.add_argument(
+        "-g",
+        "--generator",
+        dest="generator_function",
+        action=ValidateGenerator,
+        nargs="*",
+        required=False,
+        default=None,
+        help="Generator (with optional arguments)",
+    )
+
+    # Shift the message to hide
+    parser_hide.add_argument(
+        "-s", "--shift", dest="shift", default=0, help="Shift for the generator"
+    )
+
+    group_secret = parser_hide.add_mutually_exclusive_group(required=True)
+    # Non binary secret message to hide
+    group_secret.add_argument(
+        "-m", dest="secret_message", help="Your secret message to hide (non binary)."
+    )
+    # Binary secret message to hide
+    group_secret.add_argument(
+        "-f", dest="secret_file", help="Your secret to hide (Text or any binary file)."
+    )
+
+    # Image containing the secret
+    parser_hide.add_argument(
+        "-o",
+        "--output",
+        dest="output_image_file",
+        required=True,
+        help="Output image containing the secret.",
+    )
+
+    # Subparser: Reveal
+    parser_reveal = subparsers.add_parser("reveal", help="reveal help")
+    parser_reveal.add_argument(
+        "-i",
+        "--input",
+        dest="input_image_file",
+        required=True,
+        help="Input image file.",
+    )
+    parser_reveal.add_argument(
+        "-e",
+        "--encoding",
+        dest="encoding",
+        choices=tools.ENCODINGS.keys(),
+        default="UTF-8",
+        help="Specify the encoding of the message to reveal."
+        " UTF-8 (default) or UTF-32LE.",
+    )
+
+    # Generator
+    parser_reveal.add_argument(
+        "-g",
+        "--generator",
+        dest="generator_function",
+        action=ValidateGenerator,
+        nargs="*",
+        required=False,
+        help="Generator (with optional arguments)",
+    )
+
+    # Shift the message to reveal
+    parser_reveal.add_argument(
+        "-s", "--shift", dest="shift", default=0, help="Shift for the generator"
+    )
+    parser_reveal.add_argument(
+        "-o",
+        dest="secret_binary",
+        help="Output for the binary secret (Text or any binary file).",
+    )
+
+    # Subparser: List generators
+    subparsers.add_parser("list-generators", help="list-generators help")
+
+    arguments = parser.parse_args()
+
+    if arguments.command != "list-generators":
+        if not arguments.generator_function:
+            generator = None
+        else:
+            try:
+                if arguments.generator_function[0] == "LFSR":
+                    # Compute the size of the image for use by the LFSR generator if needed
+                    tmp = tools.open_image(arguments.input_image_file)
+                    size = tmp.width * tmp.height
+                    tmp.close()
+                    arguments.generator_function.append(size)
+                if len(arguments.generator_function) > 1:
+                    generator = getattr(generators, arguments.generator_function[0])(
+                        *[int(e) for e in arguments.generator_function[1:]]
+                    )
+                else:
+                    generator = getattr(generators, arguments.generator_function[0])()
+
+            except AttributeError:
+                print(f"Unknown generator: {arguments.generator_function}")
+                exit(1)
+
+    if arguments.command == "hide":
+        if arguments.secret_message is not None:
+            secret = arguments.secret_message
+        elif arguments.secret_file != "":
+            secret = tools.binary2base64(arguments.secret_file)
+
+        img_encoded = lsb.hide(
+            image=arguments.input_image_file,
+            message=secret,
+            generator=generator,
+            shift=int(arguments.shift),
+            encoding=arguments.encoding,
+        )
+        try:
+            img_encoded.save(arguments.output_image_file)
+        except Exception as e:
+            # If hide() returns an error (Too long message).
+            print(e)
+
+    elif arguments.command == "reveal":
+        try:
+            secret = lsb.reveal(
+                encoded_image=arguments.input_image_file,
+                generator=generator,
+                shift=int(arguments.shift),
+                encoding=arguments.encoding,
+            )
+        except IndexError:
+            print("Impossible to detect message.")
+            exit(0)
+        if arguments.secret_binary is not None:
+            data = tools.base642binary(secret)
+            with open(arguments.secret_binary, "wb") as f:
+                f.write(data)
+        else:
+            print(secret)
+
+    elif arguments.command == "list-generators":
+        all_generators = inspect.getmembers(generators, inspect.isfunction)
+        for generator in all_generators:
+            print("Generator id:")
+            print(f"    {crayons.green(generator[0], bold=True)}")
+            print("Desciption:")
+            print(f"    {generator[1].__doc__}")

stegano/console/parity.py

@@ -1,8 +1,6 @@
 #!/usr/bin/env python
-#-*- coding: utf-8 -*-
-
-# Stéganô - Stéganô is a basic Python Steganography module.
-# Copyright (C) 2010-2017  Cédric Bonhomme - https://www.cedricbonhomme.org
+# Stegano - Stegano is a pure Python steganography module.
+# Copyright (C) 2010-2025 Cédric Bonhomme - https://www.cedricbonhomme.org
 #
 # For more information : https://github.com/cedricbonhomme/Stegano
 #
@@ -24,21 +22,34 @@ __version__ = "$Revision: 0.7 $"
 __date__ = "$Date: 2016/08/25 $"
 __license__ = "GPLv3"
 
-try:
-    from stegano.steganalysis import parity
-except:
-    print("Install Stegano: sudo pip install Stegano")
+import argparse
 
 from PIL import Image
 
-import argparse
-parser = argparse.ArgumentParser(prog='steganalysis-parity')
-parser.add_argument("-i", "--input", dest="input_image_file",
-                help="Image file")
-parser.add_argument("-o", "--output", dest="output_image_file",
-                help="Image file")
-arguments = parser.parse_args()
+try:
+    from stegano.steganalysis import parity
+except Exception:
+    print("Install Stegano: pipx install Stegano")
 
-input_image_file = Image.open(arguments.input_image_file)
-output_image = parity.steganalyse(input_image_file)
-output_image.save(arguments.output_image_file)
+
+def main():
+    parser = argparse.ArgumentParser(prog="stegano-steganalysis-parity")
+    parser.add_argument(
+        "-i",
+        "--input",
+        dest="input_image_file",
+        required=True,
+        help="Input image file.",
+    )
+    parser.add_argument(
+        "-o",
+        "--output",
+        dest="output_image_file",
+        required=True,
+        help="Output image file.",
+    )
+    arguments = parser.parse_args()
+
+    input_image_file = Image.open(arguments.input_image_file)
+    output_image = parity.steganalyse(input_image_file)
+    output_image.save(arguments.output_image_file)

stegano/console/red.py

@@ -0,0 +1,61 @@
+#!/usr/bin/env python
+# Stegano - Stegano is a pure Python steganography module.
+# Copyright (C) 2010-2025 Cédric Bonhomme - https://www.cedricbonhomme.org
+#
+# For more information : https://github.com/cedricbonhomme/Stegano
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>
+
+__author__ = "Cedric Bonhomme"
+__version__ = "$Revision: 0.1 $"
+__date__ = "$Date: 2017/02/06 $"
+__license__ = "GPLv3"
+
+import argparse
+
+try:
+    from stegano import red
+except Exception:
+    print("Install stegano: sudo pip install Stegano")
+
+
+def main():
+    parser = argparse.ArgumentParser(prog="stegano-red")
+    subparsers = parser.add_subparsers(help="sub-command help", dest="command")
+
+    parser_hide = subparsers.add_parser("hide", help="hide help")
+    parser_hide.add_argument(
+        "-i", "--input", dest="input_image_file", help="Image file"
+    )
+    parser_hide.add_argument(
+        "-m", dest="secret_message", help="Your secret message to hide (non binary)."
+    )
+    parser_hide.add_argument(
+        "-o", "--output", dest="output_image_file", help="Image file"
+    )
+
+    parser_reveal = subparsers.add_parser("reveal", help="reveal help")
+    parser_reveal.add_argument(
+        "-i", "--input", dest="input_image_file", help="Image file"
+    )
+
+    arguments = parser.parse_args()
+
+    if arguments.command == "hide":
+        secret = red.hide(arguments.input_image_file, arguments.secret_message)
+        secret.save(arguments.output_image_file)
+
+    elif arguments.command == "reveal":
+        secret = red.reveal(arguments.input_image_file)
+        print(secret)

stegano/console/statistics.py

@@ -1,8 +1,6 @@
 #!/usr/bin/env python
-#-*- coding: utf-8 -*-
-
-# Stéganô - Stéganô is a basic Python Steganography module.
-# Copyright (C) 2010-2017  Cédric Bonhomme - https://www.cedricbonhomme.org
+# Stegano - Stegano is a pure Python steganography module.
+# Copyright (C) 2010-2025 Cédric Bonhomme - https://www.cedricbonhomme.org
 #
 # For more information : https://github.com/cedricbonhomme/Stegano
 #
@@ -25,21 +23,22 @@ __date__ = "$Date: 2016/08/26 $"
 __revision__ = "$Date: 2016/08/26 $"
 __license__ = "GPLv3"
 
-try:
-    from stegano.steganalysis import statistics
-except:
-    print("Install Stegano: sudo pip install Stegano")
+import argparse
 
 from PIL import Image
 
-import argparse
-parser = argparse.ArgumentParser(prog='steganalysis-parity')
-parser.add_argument("-i", "--input", dest="input_image_file",
-                help="Image file")
-parser.add_argument("-o", "--output", dest="output_image_file",
-                help="Image file")
-arguments = parser.parse_args()
+try:
+    from stegano.steganalysis import statistics
+except Exception:
+    print("Install Stegano: sudo pip install Stegano")
 
-input_image_file = Image.open(arguments.input_image_file)
-output_image = statistics.steganalyse(input_image_file)
-output_image.save(arguments.output_image_file)
+
+def main():
+    parser = argparse.ArgumentParser(prog="stegano-steganalysis-parity")
+    parser.add_argument("-i", "--input", dest="input_image_file", help="Image file")
+    parser.add_argument("-o", "--output", dest="output_image_file", help="Image file")
+    arguments = parser.parse_args()
+
+    input_image_file = Image.open(arguments.input_image_file)
+    output_image = statistics.steganalyse(input_image_file)
+    output_image.save(arguments.output_image_file)

stegano/exifHeader/__init__.py

@@ -1,4 +1,5 @@
 #!/usr/bin/env python
-#-*- coding: utf-8 -*-
 
-from .exifHeader import *
+from .exifHeader import hide, reveal
+
+__all__ = ["hide", "reveal"]

stegano/exifHeader/exifHeader.py

@@ -1,8 +1,6 @@
 #!/usr/bin/env python
-#-*- coding: utf-8 -*-
-
-# Stéganô - Stéganô is a basic Python Steganography module.
-# Copyright (C) 2010-2017  Cédric Bonhomme - https://www.cedricbonhomme.org
+# Stegano - Stegano is a pure Python steganography module.
+# Copyright (C) 2010-2025 Cédric Bonhomme - https://www.cedricbonhomme.org
 #
 # For more information : https://github.com/cedricbonhomme/Stegano
 #
@@ -25,25 +23,32 @@ __date__ = "$Date: 2016/05/26 $"
 __revision__ = "$Date: 2017/01/18 $"
 __license__ = "GPLv3"
 
-from PIL import Image
 import piexif
 
-def hide(input_image_file, img_enc, secret_message = None, secret_file = None, img_format = None):
-    """Hide a message (string) in an image.
-    """
-    from zlib import compress
-    from base64 import b64encode
+from stegano import tools
 
-    if secret_file != None:
-        with open(secret_file, "r") as f:
+
+def hide(
+    input_image_file,
+    img_enc,
+    secret_message=None,
+    secret_file=None,
+    img_format=None,
+):
+    """Hide a message (string) in an image."""
+    from base64 import b64encode
+    from zlib import compress
+
+    if secret_file is not None:
+        with open(secret_file) as f:
             secret_message = f.read()
 
     try:
         text = compress(b64encode(bytes(secret_message, "utf-8")))
-    except:
+    except Exception:
         text = compress(b64encode(secret_message))
 
-    img = Image.open(input_image_file)
+    img = tools.open_image(input_image_file)
 
     if img_format is None:
         img_format = img.format
@@ -61,20 +66,20 @@ def hide(input_image_file, img_enc, secret_message = None, secret_file = None, i
 
 
 def reveal(input_image_file):
-    """Find a message in an image.
-    """
+    """Find a message in an image."""
     from base64 import b64decode
     from zlib import decompress
 
-    img = Image.open(input_image_file)
+    img = tools.open_image(input_image_file)
+
     try:
-        if img.format in ['JPEG', 'TIFF']:
-            if 'exif' in img.info:
-                exif_dict = piexif.load(img.info.get("exif", b''))
+        if img.format in ["JPEG", "TIFF"]:
+            if "exif" in img.info:
+                exif_dict = piexif.load(img.info.get("exif", b""))
                 description_key = piexif.ImageIFD.ImageDescription
                 encoded_message = exif_dict["0th"][description_key]
             else:
-                encoded_message = b''
+                encoded_message = b""
         else:
             raise ValueError("Given file is neither JPEG nor TIFF.")
     finally:
@@ -87,41 +92,70 @@ if __name__ == "__main__":
     # Point of entry in execution mode.
     # TODO: improve the management of arguments
     from optparse import OptionParser
+
     parser = OptionParser(version=__version__)
-    parser.add_option('--hide', action='store_true', default=False,
-                      help="Hides a message in an image.")
-    parser.add_option('--reveal', action='store_true', default=False,
-                      help="Reveals the message hided in an image.")
+    parser.add_option(
+        "--hide",
+        action="store_true",
+        default=False,
+        help="Hides a message in an image.",
+    )
+    parser.add_option(
+        "--reveal",
+        action="store_true",
+        default=False,
+        help="Reveals the message hided in an image.",
+    )
     # Original image
-    parser.add_option("-i", "--input", dest="input_image_file",
-                    help="Input image file.")
+    parser.add_option(
+        "-i", "--input", dest="input_image_file", help="Input image file."
+    )
     # Image containing the secret
-    parser.add_option("-o", "--output", dest="output_image_file",
-                    help="Output image containing the secret.")
+    parser.add_option(
+        "-o",
+        "--output",
+        dest="output_image_file",
+        help="Output image containing the secret.",
+    )
 
     # Secret raw message to hide
-    parser.add_option("-m", "--secret-message", dest="secret_message",
-                    help="Your raw secret message to hide.")
+    parser.add_option(
+        "-m",
+        "--secret-message",
+        dest="secret_message",
+        help="Your raw secret message to hide.",
+    )
 
     # Secret text file to hide.
-    parser.add_option("-f", "--secret-file", dest="secret_file",
-                    help="Your secret text file to hide.")
+    parser.add_option(
+        "-f",
+        "--secret-file",
+        dest="secret_file",
+        help="Your secret text file to hide.",
+    )
 
-    parser.set_defaults(input_image_file = './pictures/Elisha-Cuthbert.jpg',
-                        output_image_file = './pictures/Elisha-Cuthbert_enc.jpg',
-                        secret_message = '', secret_file = '')
+    parser.set_defaults(
+        input_image_file="./pictures/Elisha-Cuthbert.jpg",
+        output_image_file="./pictures/Elisha-Cuthbert_enc.jpg",
+        secret_message="",
+        secret_file="",
+    )
 
     (options, args) = parser.parse_args()
 
     if options.hide:
         if options.secret_message != "" and options.secret_file == "":
-            hide(input_image_file=options.input_image_file, \
-                    img_enc=options.output_image_file, \
-                    secret_message=options.secret_message)
+            hide(
+                input_image_file=options.input_image_file,
+                img_enc=options.output_image_file,
+                secret_message=options.secret_message,
+            )
         elif options.secret_message == "" and options.secret_file != "":
-            hide(input_image_file=options.input_image_file, \
-                    img_enc=options.output_image_file, \
-                    secret_file=options.secret_file)
+            hide(
+                input_image_file=options.input_image_file,
+                img_enc=options.output_image_file,
+                secret_file=options.secret_file,
+            )
 
     elif options.reveal:
         reveal(input_image_file=options.input_image_file)

stegano/lsb/__init__.py

@@ -1,4 +1,5 @@
 #!/usr/bin/env python
-#-*- coding: utf-8 -*-
 
-from .lsb import *
+from .lsb import hide, reveal
+
+__all__ = ["hide", "reveal"]

stegano/lsb/generators.py

@@ -0,0 +1,254 @@
+#!/usr/bin/env python
+# Stegano - Stegano is a pure Python steganography module.
+# Copyright (C) 2010-2025 Cédric Bonhomme - https://www.cedricbonhomme.org
+#
+# For more information : https://github.com/cedricbonhomme/Stegano
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>
+
+__author__ = "Cedric Bonhomme"
+__version__ = "$Revision: 0.3 $"
+__date__ = "$Date: 2011/12/28 $"
+__revision__ = "$Date: 2021/11/29 $"
+__license__ = "GPLv3"
+
+import itertools
+import math
+from typing import Any, Dict, Iterator, List
+
+import cv2
+import numpy as np
+
+
+def identity() -> Iterator[int]:
+    """f(x) = x"""
+    n = 0
+    while True:
+        yield n
+        n += 1
+
+
+def triangular_numbers() -> Iterator[int]:
+    """Triangular numbers: a(n) = C(n+1,2) = n(n+1)/2 = 0+1+2+...+n.
+    http://oeis.org/A000217
+    """
+    n = 0
+    while True:
+        yield (n * (n + 1)) // 2
+        n += 1
+
+
+def fermat() -> Iterator[int]:
+    """Generate the n-th Fermat Number.
+    https://oeis.org/A000215
+    """
+    y = 3
+    while True:
+        yield y
+        y = pow(y - 1, 2) + 1
+
+
+def mersenne() -> Iterator[int]:
+    """Generate 2^p - 1, where p is prime.
+    https://oeis.org/A001348
+    """
+    prime_numbers = eratosthenes()
+    while True:
+        yield 2 ** next(prime_numbers) - 1
+
+
+def eratosthenes() -> Iterator[int]:
+    """Generate the prime numbers with the sieve of Eratosthenes.
+    https://oeis.org/A000040
+    """
+    d: Dict[int, List[int]] = {}
+    for i in itertools.count(2):
+        if i in d:
+            for j in d[i]:
+                d[i + j] = d.get(i + j, []) + [j]
+            del d[i]
+        else:
+            d[i * i] = [i]
+            yield i
+
+
+def composite() -> Iterator[int]:
+    """Generate the composite numbers using the sieve of Eratosthenes.
+    https://oeis.org/A002808
+    """
+    p1 = 3
+    for p2 in eratosthenes():
+        yield from range(p1 + 1, p2)
+        p1 = p2
+
+
+def carmichael() -> Iterator[int]:
+    """Composite numbers n such that a^(n-1) == 1 (mod n) for every a coprime
+    to n.
+    https://oeis.org/A002997
+    """
+    for m in composite():
+        for a in range(2, m):
+            if pow(a, m, m) != a:
+                break
+        else:
+            yield m
+
+
+def ackermann_slow(m: int, n: int) -> int:
+    """Ackermann number."""
+    if m == 0:
+        return n + 1
+    elif n == 0:
+        return ackermann_slow(m - 1, 1)
+    else:
+        return ackermann_slow(m - 1, ackermann_slow(m, n - 1))
+
+
+def ackermann_naive(m: int) -> Iterator[int]:
+    """Naive Ackermann encapsulated in a generator."""
+    n = 0
+    while True:
+        yield ackermann_slow(m, n)
+        n += 1
+
+
+def ackermann_fast(m: int, n: int) -> int:
+    """Ackermann number."""
+    while m >= 4:
+        if n == 0:
+            n = 1
+        else:
+            n = ackermann_fast(m, n - 1)
+        m -= 1
+    if m == 3:
+        return (1 << n + 3) - 3
+    elif m == 2:
+        return (n << 1) + 3
+    elif m == 1:
+        return n + 2
+    else:
+        return n + 1
+
+
+def ackermann(m: int) -> Iterator[int]:
+    """Ackermann encapsulated in a generator."""
+    n = 0
+    while True:
+        yield ackermann_fast(m, n)
+        n += 1
+
+
+def fibonacci() -> Iterator[int]:
+    """Generate the sequence of Fibonacci.
+    https://oeis.org/A000045
+    """
+    a, b = 1, 2
+    while True:
+        yield a
+        a, b = b, a + b
+
+
+def log_gen() -> Iterator[int]:
+    """Logarithmic generator."""
+    y = 1
+    while True:
+        adder = max(1, math.pow(10, int(math.log10(y))))
+        yield int(y)
+        y = y + int(adder)
+
+
+polys = {
+    2: [2, 1],
+    3: [3, 1],
+    4: [4, 1],
+    5: [5, 2],
+    6: [6, 1],
+    7: [7, 1],
+    8: [8, 4, 3, 2],
+    9: [9, 4],
+    10: [10, 3],
+    11: [11, 2],
+    12: [12, 6, 4, 1],
+    13: [13, 4, 3, 1],
+    14: [14, 8, 6, 1],
+    15: [15, 1],
+    16: [16, 12, 3, 1],
+    17: [17, 3],
+    18: [18, 7],
+    19: [19, 5, 2, 1],
+    20: [20, 3],
+    21: [21, 2],
+    22: [22, 1],
+    23: [23, 5],
+    24: [24, 7, 2, 1],
+    25: [25, 3],
+    26: [26, 6, 2, 1],
+    27: [27, 5, 2, 1],
+    28: [28, 3],
+    29: [29, 2],
+    30: [30, 23, 2, 1],
+    31: [31, 3],
+}
+
+
+def LFSR(m: int) -> Iterator[int]:
+    """LFSR generator of the given size
+    https://en.wikipedia.org/wiki/Linear-feedback_shift_register
+    """
+    n: int = m.bit_length() - 1
+    # Set initial state to {1 0 0 ... 0}
+    state: List[int] = [0] * n
+    state[0] = 1
+    feedback: int = 0
+    poly: List[int] = polys[n]
+    while True:
+        # Compute the feedback bit
+        feedback = 0
+        for i in range(len(poly)):
+            feedback = feedback ^ state[poly[i] - 1]
+        # Roll the registers
+        state.pop()
+        # Add the feedback bit
+        state.insert(0, feedback)
+        # Convert the registers to an int
+        out = sum(e * (2**i) for i, e in enumerate(state))
+        yield out
+
+
+def shi_tomashi(
+    image_path: str,
+    max_corners: int = 100,
+    quality: float = 0.01,
+    min_distance: float = 10.0,
+) -> Iterator[int]:
+    """Shi-Tomachi corner generator of the given points
+    https://docs.opencv.org/4.x/d4/d8c/tutorial_py_shi_tomasi.html
+    """
+    image = cv2.imread(image_path)
+    gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
+    corners: np.ndarray = cv2.goodFeaturesToTrack(
+        gray, max_corners, quality, min_distance
+    )
+    corners_int: np.ndarray[Any, np.dtype[np.signedinteger[Any]]] = np.array(
+        np.intp(corners)
+    )
+    i = 0
+    while True:
+        x, y = corners_int[i].ravel()
+        # Compute the pixel number with top left of image as origin
+        # using coordinates of the corner.
+        # (y * number of pixels a row) + pixels left in last row
+        yield (y * image.shape[1]) + x
+        i += 1

stegano/lsb/lsb.py

@@ -1,8 +1,6 @@
 #!/usr/bin/env python
-#-*- coding: utf-8 -*-
-
-# Stéganô - Stéganô is a basic Python Steganography module.
-# Copyright (C) 2010-2017  Cédric Bonhomme - https://www.cedricbonhomme.org
+# Stegano - Stegano is a pure Python steganography module.
+# Copyright (C) 2010-2025 Cédric Bonhomme - https://www.cedricbonhomme.org
 #
 # For more information : https://github.com/cedricbonhomme/Stegano
 #
@@ -20,105 +18,73 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>
 
 __author__ = "Cedric Bonhomme"
-__version__ = "$Revision: 0.3 $"
-__date__ = "$Date: 2016/08/04 $"
-__revision__ = "$Date: 2017/05/04 $"
+__version__ = "$Revision: 0.7 $"
+__date__ = "$Date: 2016/03/13 $"
+__revision__ = "$Date: 2019/05/31 $"
 __license__ = "GPLv3"
 
-import sys
-
-from PIL import Image
+from typing import IO, Iterator, Union
 
 from stegano import tools
 
-def hide(input_image_file: str,
-        message,
-        encoding='UTF-8',
-        auto_convert_rgb: bool = False):
+from .generators import identity
+
+
+def hide(
+    image: Union[str, IO[bytes]],
+    message: str,
+    generator: Union[None, Iterator[int]] = None,
+    shift: int = 0,
+    encoding: str = "UTF-8",
+    auto_convert_rgb: bool = False,
+):
     """Hide a message (string) in an image with the
     LSB (Least Significant Bit) technique.
     """
-    message_length = len(message)
-    assert message_length != 0, "message length is zero"
+    hider = tools.Hider(image, message, encoding, auto_convert_rgb)
+    width = hider.encoded_image.width
 
-    img = Image.open(input_image_file)
+    if not generator:
+        generator = identity()
 
-    if img.mode not in ['RGB', 'RGBA']:
-        if not auto_convert_rgb:
-            print('The mode of the image is not RGB. Mode is {}'.\
-                                                            format(img.mode))
-            answer = input('Convert the image to RGB ? [Y / n]\n') or 'Y'
-            if answer.lower() == 'n':
-                raise Exception('Not a RGB image.')
-        img = img.convert('RGB')
+    while shift != 0:
+        next(generator)
+        shift -= 1
 
-    encoded = img.copy()
-    width, height = img.size
-    index = 0
+    while hider.encode_another_pixel():
+        generated_number = next(generator)
 
-    message = str(message_length) + ":" + str(message)
-    message_bits = "".join(tools.a2bits_list(message, encoding))
-    message_bits += '0' * ((3 - (len(message_bits) % 3)) % 3)
+        col = generated_number % width
+        row = int(generated_number / width)
 
-    npixels = width * height
-    len_message_bits = len(message_bits)
-    if len_message_bits > npixels * 3:
-        raise Exception("The message you want to hide is too long: {}". \
-                                                        format(message_length))
-    for row in range(height):
-        for col in range(width):
-            if index + 3 <= len_message_bits :
+        hider.encode_pixel((col, row))
 
-                # Get the colour component.
-                pixel = img.getpixel((col, row))
-                r = pixel[0]
-                g = pixel[1]
-                b = pixel[2]
-
-                # Change the Least Significant Bit of each colour component.
-                r = tools.setlsb(r, message_bits[index])
-                g = tools.setlsb(g, message_bits[index+1])
-                b = tools.setlsb(b, message_bits[index+2])
-
-                # Save the new pixel
-                if img.mode == 'RGBA':
-                    encoded.putpixel((col, row), (r, g, b, pixel[3]))
-                else:
-                    encoded.putpixel((col, row), (r, g, b))
-
-                index += 3
-            else:
-                img.close()
-                return encoded
+    return hider.encoded_image
 
 
-def reveal(input_image_file, encoding='UTF-8'):
-    """Find a message in an image (with the LSB technique).
-    """
-    img = Image.open(input_image_file)
-    width, height = img.size
-    buff, count = 0, 0
-    bitab = []
-    limit = None
-    for row in range(height):
-        for col in range(width):
+def reveal(
+    encoded_image: Union[str, IO[bytes]],
+    generator: Union[None, Iterator[int]] = None,
+    shift: int = 0,
+    encoding: str = "UTF-8",
+    close_file: bool = True,
+):
+    """Find a message in an image (with the LSB technique)."""
+    revealer = tools.Revealer(encoded_image, encoding, close_file)
+    width = revealer.encoded_image.width
 
-            # pixel = [r, g, b] or [r,g,b,a]
-            pixel = img.getpixel((col, row))
-            if img.mode == 'RGBA':
-                pixel = pixel[:3] # ignore the alpha
-            for color in pixel:
-                buff += (color&1)<<(tools.ENCODINGS[encoding]-1 - count)
-                count += 1
-                if count == tools.ENCODINGS[encoding]:
-                    bitab.append(chr(buff))
-                    buff, count = 0, 0
-                    if bitab[-1] == ":" and limit == None:
-                        try:
-                            limit = int("".join(bitab[:-1]))
-                        except:
-                            pass
+    if not generator:
+        generator = identity()
 
-            if len(bitab)-len(str(limit))-1 == limit :
-                img.close()
-                return "".join(bitab)[len(str(limit))+1:]
+    while shift != 0:
+        next(generator)
+        shift -= 1
+
+    while True:
+        generated_number = next(generator)
+
+        col = generated_number % width
+        row = int(generated_number / width)
+
+        if revealer.decode_pixel((col, row)):
+            return revealer.secret_message

stegano/lsbset/__init__.py

@@ -1,4 +0,0 @@
-#!/usr/bin/env python
-#-*- coding: utf-8 -*-
-
-from .lsbset import *

stegano/lsbset/generators.py

@@ -1,140 +0,0 @@
-#!/usr/bin/env python
-# -*- coding: utf-8 -*-
-
-# Stéganô - Stéganô is a basic Python Steganography module.
-# Copyright (C) 2010-2017  Cédric Bonhomme - https://www.cedricbonhomme.org
-#
-# For more information : https://github.com/cedricbonhomme/Stegano
-#
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>
-
-__author__ = "Cedric Bonhomme"
-__version__ = "$Revision: 0.3 $"
-__date__ = "$Date: 2011/12/28 $"
-__revision__ = "$Date: 2017/03/10 $"
-__license__ = "GPLv3"
-
-import math
-import itertools
-from typing import Iterator, List, Dict
-
-def identity() -> Iterator[int]:
-    """f(x) = x
-    """
-    n = 0
-    while True:
-        yield n
-        n += 1
-
-def triangular_numbers() -> Iterator[int]:
-    """Triangular numbers: a(n) = C(n+1,2) = n(n+1)/2 = 0+1+2+...+n.
-    http://oeis.org/A000217
-    """
-    n = 0
-    while True:
-        yield (n*(n+1))//2
-        n += 1
-
-def fermat() -> Iterator[int]:
-    """Generate the n-th Fermat Number.
-    https://oeis.org/A000215
-    """
-    y = 3
-    while True:
-        yield y
-        y = pow(y-1,2)+1
-
-def mersenne() -> Iterator[int]:
-    """Generate 2^n - 1.
-    https://oeis.org/A001348
-    """
-    y = 3
-    while True:
-        yield y
-        y = 2*y + 1
-
-def eratosthenes() -> Iterator[int]:
-    """Generate the prime numbers with the sieve of Eratosthenes.
-    https://oeis.org/A000040
-    """
-    d = {} # type: Dict[int, List[int]]
-    for i in itertools.count(2):
-        if i in d:
-            for j in d[i]:
-                d[i + j] = d.get(i + j, []) + [j]
-            del d[i]
-        else:
-            d[i * i] = [i]
-            yield i
-
-def composite() -> Iterator[int]:
-    """Generate the composite numbers using the sieve of Eratosthenes.
-    https://oeis.org/A002808
-    """
-    p1 = 3
-    for p2 in eratosthenes():
-        for n in range(p1 + 1, p2):
-            yield n
-        p1 = p2
-
-def carmichael() -> Iterator[int]:
-    """Composite numbers n such that a^(n-1) == 1 (mod n) for every a coprime to n.
-    https://oeis.org/A002997
-    """
-    for m in composite():
-        for a in range(2, m):
-            if pow(a,m,m) != a:
-                break
-        else:
-            yield m
-
-def ackermann(m: int, n: int) -> int:
-    """Ackermann number.
-    """
-    if m == 0:
-        return n + 1
-    elif n == 0:
-        return ackermann(m - 1, 1)
-    else:
-        return ackermann(m - 1, ackermann(m, n - 1))
-
-def fibonacci() -> Iterator[int]:
-    """Generate the sequence of Fibonacci.
-    https://oeis.org/A000045
-    """
-    a, b = 1, 2
-    while True:
-        yield a
-        a, b = b, a + b
-
-def syracuse(l: int = 15) -> Iterator[int]:
-    """Generate the sequence of Syracuse.
-    """
-    y = l
-    while True:
-        yield y
-        q,r = divmod(y,2)
-        if r == 0:
-            y = q
-        else:
-            y = 3*y + 1
-
-def log_gen() -> Iterator[int]:
-    """Logarithmic generator.
-    """
-    y = 1
-    while True:
-        adder = max(1, math.pow(10, int(math.log10(y))))
-        yield int(y)
-        y = y + int(adder)

stegano/lsbset/lsbset.py

@@ -1,122 +0,0 @@
-#!/usr/bin/env python
-#-*- coding: utf-8 -*-
-
-# Stéganô - Stéganô is a basic Python Steganography module.
-# Copyright (C) 2010-2017  Cédric Bonhomme - https://www.cedricbonhomme.org
-#
-# For more information : https://github.com/cedricbonhomme/Stegano
-#
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>
-
-__author__ = "Cedric Bonhomme"
-__version__ = "$Revision: 0.5 $"
-__date__ = "$Date: 2016/03/13 $"
-__revision__ = "$Date: 2017/05/04 $"
-__license__ = "GPLv3"
-
-import sys
-
-from PIL import Image
-
-from stegano import tools
-from . import generators
-
-def hide(input_image_file,
-        message,
-        generator,
-        encoding='UTF-8',
-        auto_convert_rgb=False):
-    """Hide a message (string) in an image with the
-    LSB (Least Significant Bit) technique.
-    """
-    message_length = len(message)
-    assert message_length != 0, "message length is zero"
-
-    img = Image.open(input_image_file)
-
-    if img.mode not in ['RGB', 'RGBA']:
-        if not auto_convert_rgb:
-            print('The mode of the image is not RGB. Mode is {}'.\
-                                                            format(img.mode))
-            answer = input('Convert the image to RGB ? [Y / n]\n') or 'Y'
-            if answer.lower() == 'n':
-                raise Exception('Not a RGB image.')
-        img = img.convert('RGB')
-
-    img_list = list(img.getdata())
-    width, height = img.size
-    index = 0
-
-    message = str(message_length) + ":" + str(message)
-    message_bits = "".join(tools.a2bits_list(message, encoding))
-    message_bits += '0' * ((3 - (len(message_bits) % 3)) % 3)
-
-    npixels = width * height
-    len_message_bits = len(message_bits)
-    if len_message_bits > npixels * 3:
-        raise Exception("The message you want to hide is too long: {}". \
-                                                        format(message_length))
-
-    while index + 3 <= len_message_bits :
-        generated_number = next(generator)
-        r, g, b, *a = img_list[generated_number]
-
-        # Change the Least Significant Bit of each colour component.
-        r = tools.setlsb(r, message_bits[index])
-        g = tools.setlsb(g, message_bits[index+1])
-        b = tools.setlsb(b, message_bits[index+2])
-
-        # Save the new pixel
-        if img.mode == 'RGBA':
-            img_list[generated_number] = (r, g , b, a[0])
-        else:
-            img_list[generated_number] = (r, g , b)
-
-        index += 3
-
-    # create empty new image of appropriate format
-    encoded = Image.new('RGB', (img.size))
-
-    # insert saved data into the image
-    encoded.putdata(img_list)
-
-    return encoded
-
-
-def reveal(input_image_file, generator, encoding='UTF-8'):
-    """Find a message in an image (with the LSB technique).
-    """
-    img = Image.open(input_image_file)
-    img_list = list(img.getdata())
-    width, height = img.size
-    buff, count = 0, 0
-    bitab = []
-    limit = None
-
-    while True:
-        generated_number = next(generator)
-        # color = [r, g, b]
-        for color in img_list[generated_number]:
-            buff += (color&1)<<(tools.ENCODINGS[encoding]-1 - count)
-            count += 1
-            if count == tools.ENCODINGS[encoding]:
-                bitab.append(chr(buff))
-                buff, count = 0, 0
-                if bitab[-1] == ":" and limit == None:
-                    try:
-                        limit = int("".join(bitab[:-1]))
-                    except:
-                        pass
-        if len(bitab)-len(str(limit))-1 == limit :
-            return "".join(bitab)[len(str(limit))+1:]

stegano/red/__init__.py

@@ -1,4 +1,5 @@
 #!/usr/bin/env python
-#-*- coding: utf-8 -*-
 
-from .red import *
+from .red import hide, reveal
+
+__all__ = ["hide", "reveal"]

stegano/red/red.py

@@ -1,8 +1,6 @@
 #!/usr/bin/env python
-# -*- coding: utf-8 -*-
-
-# Stéganô - Stéganô is a basic Python Steganography module.
-# Copyright (C) 2010-2017  Cédric Bonhomme - https://www.cedricbonhomme.org
+# Stegano - Stéganô is a basic Python Steganography module.
+# Copyright (C) 2010-2024  Cédric Bonhomme - https://www.cedricbonhomme.org
 #
 # For more information : https://github.com/cedricbonhomme/Stegano
 #
@@ -25,11 +23,12 @@ __date__ = "$Date: 2010/10/01 $"
 __revision__ = "$Date: 2017/02/06 $"
 __license__ = "GPLv3"
 
-import sys
+from typing import IO, Union
 
-from PIL import Image
+from stegano import tools
 
-def hide(input_image_file, message):
+
+def hide(input_image: Union[str, IO[bytes]], message: str):
     """
     Hide a message (string) in an image.
 
@@ -40,7 +39,7 @@ def hide(input_image_file, message):
     message_length = len(message)
     assert message_length != 0, "message message_length is zero"
     assert message_length < 255, "message is too long"
-    img = Image.open(input_image_file)
+    img = tools.open_image(input_image)
     # Use a copy of image to hide the text in
     encoded = img.copy()
     width, height = img.size
@@ -52,16 +51,17 @@ def hide(input_image_file, message):
             if row == 0 and col == 0 and index < message_length:
                 asc = message_length
             elif index <= message_length:
-                c = message[index -1]
+                c = message[index - 1]
                 asc = ord(c)
             else:
                 asc = r
-            encoded.putpixel((col, row), (asc, g , b))
+            encoded.putpixel((col, row), (asc, g, b))
             index += 1
     img.close()
     return encoded
 
-def reveal(input_image_file):
+
+def reveal(input_image: Union[str, IO[bytes]]):
     """
     Find a message in an image.
 
@@ -69,7 +69,7 @@ def reveal(input_image_file):
     hidden message characters (ASCII values).
     The red value of the first pixel is used for message_length of string.
     """
-    img = Image.open(input_image_file)
+    img = tools.open_image(input_image)
     width, height = img.size
     message = ""
     index = 0

stegano/steganalysis/__init__.py

@@ -1,5 +1 @@
 #!/usr/bin/env python
-#-*- coding: utf-8 -*-
-
-from .parity import *
-from .statistics import *

stegano/steganalysis/parity.py

@@ -1,8 +1,6 @@
 #!/usr/bin/env python
-#-*- coding: utf-8 -*-
-
-# Stéganô - Stéganô is a basic Python Steganography module.
-# Copyright (C) 2010-2017  Cédric Bonhomme - https://www.cedricbonhomme.org
+# Stegano - Stegano is a pure Python steganography module.
+# Copyright (C) 2010-2025 Cédric Bonhomme - https://www.cedricbonhomme.org
 #
 # For more information : https://github.com/cedricbonhomme/Stegano
 #
@@ -20,22 +18,26 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>
 
 __author__ = "Cedric Bonhomme"
-__version__ = "$Revision: 0.1 $"
+__version__ = "$Revision: 0.9.4 $"
 __date__ = "$Date: 2010/10/01 $"
+__revision__ = "$Date: 2019/06/06 $"
 __license__ = "GPLv3"
 
 from PIL import Image
 
-def steganalyse(img):
+
+def steganalyse(img: Image.Image) -> Image.Image:
     """
     Steganlysis of the LSB technique.
     """
-    encoded = img.copy()
+    encoded = Image.new(img.mode, (img.size))
     width, height = img.size
-    bits = ""
     for row in range(height):
         for col in range(width):
-            r, g, b = img.getpixel((col, row))
+            if pixel := img.getpixel((col, row)):
+                r, g, b = pixel[0:3]
+            else:
+                raise Exception("Error during steganlysis.")
             if r % 2 == 0:
                 r = 0
             else:
@@ -48,5 +50,5 @@ def steganalyse(img):
                 b = 0
             else:
                 b = 255
-            encoded.putpixel((col, row), (r, g , b))
+            encoded.putpixel((col, row), (r, g, b))
     return encoded

stegano/steganalysis/statistics.py

@@ -1,8 +1,6 @@
 #!/usr/bin/env python
-#-*- coding: utf-8 -*-
-
-# Stéganô - Stéganô is a basic Python Steganography module.
-# Copyright (C) 2010-2017  Cédric Bonhomme - https://www.cedricbonhomme.org
+# Stegano - Stegano is a pure Python steganography module.
+# Copyright (C) 2010-2025 Cédric Bonhomme - https://www.cedricbonhomme.org
 #
 # For more information : https://github.com/cedricbonhomme/Stegano
 #
@@ -22,34 +20,33 @@
 __author__ = "Cedric Bonhomme"
 __version__ = "$Revision: 0.2 $"
 __date__ = "$Date: 2010/10/01 $"
-__revision__ = "$Date: 2016/08/26 $"
+__revision__ = "$Date: 2021/11/01 $"
 __license__ = "GPLv3"
 
-import operator
+import typing
+from collections import Counter, OrderedDict
 
-from PIL import Image
-from collections import Counter
-from collections import OrderedDict
 
 def steganalyse(img):
     """
     Steganlysis of the LSB technique.
     """
-    encoded = img.copy()
     width, height = img.size
-    colours = Counter()
+    colours_counter: typing.Counter[int] = Counter()
     for row in range(height):
         for col in range(width):
             r, g, b = img.getpixel((col, row))
-            colours[r] += 1
+            colours_counter[r] += 1
 
-    most_common = colours.most_common(10)
-    dict_colours = OrderedDict(sorted(list(colours.items()), key=lambda t: t[1]))
+    most_common = colours_counter.most_common(10)
+    dict_colours = OrderedDict(
+        sorted(list(colours_counter.items()), key=lambda t: t[1])
+    )
 
-    colours = 0
+    colours: float = 0
     for colour in list(dict_colours.keys()):
         colours += colour
     colours = colours / len(dict_colours)
 
-    #return colours.most_common(10)
+    # return colours.most_common(10)
     return list(dict_colours.keys())[:30], most_common

stegano/tools.py

@@ -1,8 +1,6 @@
 #!/usr/bin/env python
-# -*- coding: utf-8 -*-
-
-# Stéganô - Stéganô is a basic Python Steganography module.
-# Copyright (C) 2010-2017  Cédric Bonhomme - https://www.cedricbonhomme.org
+# Stegano - Stegano is a pure Python steganography module.
+# Copyright (C) 2010-2025 Cédric Bonhomme - https://www.cedricbonhomme.org
 #
 # For more information : https://github.com/cedricbonhomme/Stegano
 #
@@ -27,13 +25,13 @@ __license__ = "GPLv3"
 
 import base64
 import itertools
-from typing import List, Iterator, Tuple, Union
 from functools import reduce
+from typing import IO, List, Union
+
+from PIL import Image
+
+ENCODINGS = {"UTF-8": 8, "UTF-32LE": 32}
 
-ENCODINGS = {
-    'UTF-8': 8,
-    'UTF-32LE': 32
-}
 
 def a2bits(chars: str) -> str:
     """Converts a string to its bits representation as a string of 0's and 1's.
@@ -41,9 +39,10 @@ def a2bits(chars: str) -> str:
     >>> a2bits("Hello World!")
     '010010000110010101101100011011000110111100100000010101110110111101110010011011000110010000100001'
     """
-    return bin(reduce(lambda x, y : (x<<8)+y, (ord(c) for c in chars), 1))[3:]
+    return bin(reduce(lambda x, y: (x << 8) + y, (ord(c) for c in chars), 1))[3:]
 
-def a2bits_list(chars: str, encoding: str ='UTF-8') -> List[str]:
+
+def a2bits_list(chars: str, encoding: str = "UTF-8") -> List[str]:
     """Convert a string to its bits representation as a list of 0's and 1's.
 
     >>>  a2bits_list("Hello World!")
@@ -62,20 +61,20 @@ def a2bits_list(chars: str, encoding: str ='UTF-8') -> List[str]:
     >>> "".join(a2bits_list("Hello World!"))
     '010010000110010101101100011011000110111100100000010101110110111101110010011011000110010000100001'
     """
-    return [bin(ord(x))[2:].rjust(ENCODINGS[encoding],"0") for x in chars]
+    return [bin(ord(x))[2:].rjust(ENCODINGS[encoding], "0") for x in chars]
+
 
 def bs(s: int) -> str:
-    """Converts an int to its bits representation as a string of 0's and 1's.
-    """
-    return str(s) if s<=1 else bs(s>>1) + str(s&1)
+    """Converts an int to its bits representation as a string of 0's and 1's."""
+    return str(s) if s <= 1 else bs(s >> 1) + str(s & 1)
+
 
 def setlsb(component: int, bit: str) -> int:
-    """Set Least Significant Bit of a colour component.
-    """
+    """Set Least Significant Bit of a colour component."""
     return component & ~1 | int(bit)
 
-def n_at_a_time(items: List[int], n: int, fillvalue: str) \
-        -> Iterator[Tuple[Union[int, str]]]:
+
+def n_at_a_time(items: List[int], n: int, fillvalue: str):
     """Returns an iterator which groups n items at a time.
     Any final partial tuple will be padded with the fillvalue
 
@@ -85,6 +84,7 @@ def n_at_a_time(items: List[int], n: int, fillvalue: str) \
     it = iter(items)
     return itertools.zip_longest(*[it] * n, fillvalue=fillvalue)
 
+
 def binary2base64(binary_file: str) -> str:
     """Convert a binary file (OGG, executable, etc.) to a
     printable string.
@@ -94,8 +94,130 @@ def binary2base64(binary_file: str) -> str:
         encoded_string = base64.b64encode(bin_file.read())
     return encoded_string.decode()
 
+
 def base642binary(b64_fname: str) -> bytes:
-    """Convert a printable string to a binary file.
-    """
-    b64_fname += '==='
+    """Convert a printable string to a binary file."""
+    b64_fname += "==="
     return base64.b64decode(b64_fname)
+
+
+def open_image(fname_or_instance: Union[str, IO[bytes]]):
+    """Opens a Image and returns it.
+
+    :param fname_or_instance: Can either be the location of the image as a
+                              string or the Image.Image instance itself.
+    """
+    if isinstance(fname_or_instance, Image.Image):
+        return fname_or_instance
+
+    return Image.open(fname_or_instance)
+
+
+class Hider:
+    def __init__(
+        self,
+        input_image: Union[str, IO[bytes]],
+        message: str,
+        encoding: str = "UTF-8",
+        auto_convert_rgb: bool = False,
+    ):
+        self._index = 0
+
+        message_length = len(message)
+        assert message_length != 0, "message length is zero"
+
+        image = open_image(input_image)
+
+        if image.mode not in ["RGB", "RGBA"]:
+            if not auto_convert_rgb:
+                print(f"The mode of the image is not RGB. Mode is {image.mode}")
+                answer = input("Convert the image to RGB ? [Y / n]\n") or "Y"
+                if answer.lower() == "n":
+                    raise Exception("Not a RGB image.")
+
+            image = image.convert("RGB")
+
+        self.encoded_image = image.copy()
+        image.close()
+
+        message = str(message_length) + ":" + str(message)
+        self._message_bits = "".join(a2bits_list(message, encoding))
+        self._message_bits += "0" * ((3 - (len(self._message_bits) % 3)) % 3)
+
+        width, height = self.encoded_image.size
+        npixels = width * height
+        self._len_message_bits = len(self._message_bits)
+
+        if self._len_message_bits > npixels * 3:
+            raise Exception(
+                f"The message you want to hide is too long: {message_length}"
+            )
+
+    def encode_another_pixel(self):
+        return True if self._index + 3 <= self._len_message_bits else False
+
+    def encode_pixel(self, coordinate: tuple):
+        # Get the colour component.
+        r, g, b, *a = self.encoded_image.getpixel(coordinate)
+
+        # Change the Least Significant Bit of each colour component.
+        r = setlsb(r, self._message_bits[self._index])
+        g = setlsb(g, self._message_bits[self._index + 1])
+        b = setlsb(b, self._message_bits[self._index + 2])
+
+        # Save the new pixel
+        if self.encoded_image.mode == "RGBA":
+            self.encoded_image.putpixel(coordinate, (r, g, b, *a))
+        else:
+            self.encoded_image.putpixel(coordinate, (r, g, b))
+
+        self._index += 3
+
+
+class Revealer:
+    def __init__(
+        self,
+        encoded_image: Union[str, IO[bytes]],
+        encoding: str = "UTF-8",
+        close_file: bool = True,
+    ):
+        self.encoded_image = open_image(encoded_image)
+        self._encoding_length = ENCODINGS[encoding]
+        self._buff, self._count = 0, 0
+        self._bitab: List[str] = []
+        self._limit: Union[None, int] = None
+        self.secret_message = ""
+        self.close_file = close_file
+
+    def decode_pixel(self, coordinate: tuple):
+        # pixel = [r, g, b] or [r,g,b,a]
+        pixel = self.encoded_image.getpixel(coordinate)
+
+        if self.encoded_image.mode == "RGBA":
+            pixel = pixel[:3]  # ignore the alpha
+
+        for color in pixel:
+            self._buff += (color & 1) << (self._encoding_length - 1 - self._count)
+            self._count += 1
+
+            if self._count == self._encoding_length:
+                self._bitab.append(chr(self._buff))
+                self._buff, self._count = 0, 0
+
+                if self._bitab[-1] == ":" and self._limit is None:
+                    if "".join(self._bitab[:-1]).isdigit():
+                        self._limit = int("".join(self._bitab[:-1]))
+                    else:
+                        raise IndexError("Impossible to detect message.")
+
+        if len(self._bitab) - len(str(self._limit)) - 1 == self._limit:
+            self.secret_message = "".join(self._bitab)[
+                len(str(self._limit)) + 1 :  # noqa: E203
+            ]
+            if self.close_file:
+                self.encoded_image.close()
+
+            return True
+
+        else:
+            return False

tests/expected-results/LFSR

@@ -0,0 +1,256 @@
+2
+5
+11
+22
+44
+88
+177
+99
+199
+143
+30
+61
+122
+244
+232
+208
+161
+67
+135
+15
+31
+63
+127
+255
+254
+252
+249
+242
+228
+200
+144
+33
+66
+133
+10
+20
+41
+83
+167
+79
+159
+62
+125
+250
+245
+234
+213
+170
+85
+171
+87
+174
+92
+184
+112
+224
+193
+131
+6
+12
+24
+49
+98
+197
+138
+21
+43
+86
+172
+89
+179
+102
+204
+153
+50
+101
+203
+151
+47
+95
+191
+126
+253
+251
+247
+239
+222
+188
+121
+243
+230
+205
+155
+55
+110
+221
+187
+119
+238
+220
+185
+114
+229
+202
+149
+42
+84
+169
+82
+165
+74
+148
+40
+81
+162
+68
+137
+18
+37
+75
+150
+45
+90
+180
+104
+209
+163
+70
+140
+25
+51
+103
+206
+156
+57
+115
+231
+207
+158
+60
+120
+241
+227
+198
+141
+27
+54
+108
+216
+176
+97
+194
+132
+8
+17
+34
+69
+139
+23
+46
+93
+186
+117
+235
+215
+175
+94
+189
+123
+246
+237
+219
+183
+111
+223
+190
+124
+248
+240
+225
+195
+134
+13
+26
+52
+105
+211
+166
+77
+154
+53
+107
+214
+173
+91
+182
+109
+218
+181
+106
+212
+168
+80
+160
+65
+130
+4
+9
+19
+39
+78
+157
+59
+118
+236
+217
+178
+100
+201
+146
+36
+73
+147
+38
+76
+152
+48
+96
+192
+129
+3
+7
+14
+29
+58
+116
+233
+210
+164
+72
+145
+35
+71
+142
+28
+56
+113
+226
+196
+136
+16
+32
+64
+128
+1
+2

tests/expected-results/carmichael

@@ -0,0 +1,33 @@
+561
+1105
+1729
+2465
+2821
+6601
+8911
+10585
+15841
+29341
+41041
+46657
+52633
+62745
+63973
+75361
+101101
+115921
+126217
+162401
+172081
+188461
+252601
+278545
+294409
+314821
+334153
+340561
+399001
+410041
+449065
+488881
+512461

tests/expected-results/composite

@@ -0,0 +1,114 @@
+4
+6
+8
+9
+10
+12
+14
+15
+16
+18
+20
+21
+22
+24
+25
+26
+27
+28
+30
+32
+33
+34
+35
+36
+38
+39
+40
+42
+44
+45
+46
+48
+49
+50
+51
+52
+54
+55
+56
+57
+58
+60
+62
+63
+64
+65
+66
+68
+69
+70
+72
+74
+75
+76
+77
+78
+80
+81
+82
+84
+85
+86
+87
+88
+90
+91
+92
+93
+94
+95
+96
+98
+99
+100
+102
+104
+105
+106
+108
+110
+111
+112
+114
+115
+116
+117
+118
+119
+120
+121
+122
+123
+124
+125
+126
+128
+129
+130
+132
+133
+134
+135
+136
+138
+140
+141
+142
+143
+144
+145
+146
+147
+148
+150

tests/expected-results/eratosthenes

@@ -0,0 +1,168 @@
+2
+3
+5
+7
+11
+13
+17
+19
+23
+29
+31
+37
+41
+43
+47
+53
+59
+61
+67
+71
+73
+79
+83
+89
+97
+101
+103
+107
+109
+113
+127
+131
+137
+139
+149
+151
+157
+163
+167
+173
+179
+181
+191
+193
+197
+199
+211
+223
+227
+229
+233
+239
+241
+251
+257
+263
+269
+271
+277
+281
+283
+293
+307
+311
+313
+317
+331
+337
+347
+349
+353
+359
+367
+373
+379
+383
+389
+397
+401
+409
+419
+421
+431
+433
+439
+443
+449
+457
+461
+463
+467
+479
+487
+491
+499
+503
+509
+521
+523
+541
+547
+557
+563
+569
+571
+577
+587
+593
+599
+601
+607
+613
+617
+619
+631
+641
+643
+647
+653
+659
+661
+673
+677
+683
+691
+701
+709
+719
+727
+733
+739
+743
+751
+757
+761
+769
+773
+787
+797
+809
+811
+821
+823
+827
+829
+839
+853
+857
+859
+863
+877
+881
+883
+887
+907
+911
+919
+929
+937
+941
+947
+953
+967
+971
+977
+983
+991
+997

tests/expected-results/fermat

@@ -0,0 +1,9 @@
+3
+5
+17
+257
+65537
+4294967297
+18446744073709551617
+340282366920938463463374607431768211457
+115792089237316195423570985008687907853269984665640564039457584007913129639937

tests/expected-results/mersenne

@@ -0,0 +1,20 @@
+3
+7
+31
+127
+2047
+8191
+131071
+524287
+8388607
+536870911
+2147483647
+137438953471
+2199023255551
+8796093022207
+140737488355327
+9007199254740991
+576460752303423487
+2305843009213693951
+147573952589676412927
+2361183241434822606847

tests/expected-results/statistics

@@ -0,0 +1 @@
+([58, 56, 54, 57, 60, 59, 62, 61, 63, 65, 64, 66, 67, 254, 68, 69, 255, 70, 253, 71, 72, 74, 252, 73, 251, 250, 75, 249, 76, 77], [(224, 4327), (221, 4138), (223, 4057), (222, 3987), (225, 3713), (220, 3554), (209, 3516), (207, 3476), (208, 3424), (219, 3360)])

tests/expected-results/triangular_numbers

@@ -0,0 +1,54 @@
+0
+1
+3
+6
+10
+15
+21
+28
+36
+45
+55
+66
+78
+91
+105
+120
+136
+153
+171
+190
+210
+231
+253
+276
+300
+325
+351
+378
+406
+435
+465
+496
+528
+561
+595
+630
+666
+703
+741
+780
+820
+861
+903
+946
+990
+1035
+1081
+1128
+1176
+1225
+1275
+1326
+1378
+1431

tests/test_exifHeader.py

@@ -1,8 +1,6 @@
 #!/usr/bin/env python
-#-*- coding: utf-8 -*-
-
-# Stéganô - Stéganô is a basic Python Steganography module.
-# Copyright (C) 2010-2017  Cédric Bonhomme - https://www.cedricbonhomme.org
+# Stegano - Stegano is a pure Python steganography module.
+# Copyright (C) 2010-2025 Cédric Bonhomme - https://www.cedricbonhomme.org
 #
 # For more information : https://github.com/cedricbonhomme/Stegano
 #
@@ -25,20 +23,19 @@ __date__ = "$Date: 2016/05/17 $"
 __revision__ = "$Date: 2017/01/18 $"
 __license__ = "GPLv3"
 
+import io
 import os
 import unittest
-import io
 
 from stegano import exifHeader
 
-class TestEXIFHeader(unittest.TestCase):
 
+class TestEXIFHeader(unittest.TestCase):
     def test_hide_empty_message(self):
-        """Test hiding the empty string.
-        """
-        secret = exifHeader.hide("./tests/sample-files/20160505T130442.jpg",
-                                "./image.jpg", secret_message="")
-        #secret.save(""./image.png"")
+        """Test hiding the empty string."""
+        exifHeader.hide(
+            "./tests/sample-files/20160505T130442.jpg", "./image.jpg", secret_message=""
+        )
 
         clear_message = exifHeader.reveal("./image.jpg")
 
@@ -48,17 +45,20 @@ class TestEXIFHeader(unittest.TestCase):
         messages_to_hide = ["a", "foo", "Hello World!", ":Python:"]
 
         for message in messages_to_hide:
-            secret = exifHeader.hide("./tests/sample-files/20160505T130442.jpg",
-                                    "./image.jpg", secret_message=message)
+            exifHeader.hide(
+                "./tests/sample-files/20160505T130442.jpg",
+                "./image.jpg",
+                secret_message=message,
+            )
 
             clear_message = exifHeader.reveal("./image.jpg")
 
-            self.assertEqual(message, message)
+            self.assertEqual(message, clear_message.decode())
 
     def test_with_image_without_exif_data(self):
-        secret = exifHeader.hide("./tests/sample-files/Lenna.jpg",
-                                "./image.jpg", secret_message="")
-        #secret.save(""./image.png"")
+        exifHeader.hide(
+            "./tests/sample-files/Lenna.jpg", "./image.jpg", secret_message=""
+        )
 
         clear_message = exifHeader.reveal("./image.jpg")
 
@@ -68,40 +68,42 @@ class TestEXIFHeader(unittest.TestCase):
         text_file_to_hide = "./tests/sample-files/lorem_ipsum.txt"
         with open(text_file_to_hide, "rb") as f:
             message = f.read()
-        secret = exifHeader.hide("./tests/sample-files/20160505T130442.jpg",
-                            img_enc="./image.jpg",
-                            secret_file=text_file_to_hide)
+        exifHeader.hide(
+            "./tests/sample-files/20160505T130442.jpg",
+            img_enc="./image.jpg",
+            secret_file=text_file_to_hide,
+        )
 
         clear_message = exifHeader.reveal("./image.jpg")
         self.assertEqual(message, clear_message)
 
     def test_with_png_image(self):
-        secret = exifHeader.hide("./tests/sample-files/Lenna.png",
-                                "./image.png", secret_message="Secret")
-        #secret.save(""./image.png"")
+        exifHeader.hide(
+            "./tests/sample-files/Lenna.png", "./image.png", secret_message="Secret"
+        )
 
         with self.assertRaises(ValueError):
-            clear_message = exifHeader.reveal("./image.png")
+            exifHeader.reveal("./image.png")
 
     def test_with_bytes(self):
         outputBytes = io.BytesIO()
         message = b"Secret"
-        exifHeader.hide(open("./tests/sample-files/20160505T130442.jpg", 'rb'),
-                            outputBytes,
-                            secret_message=message)
+        with open("./tests/sample-files/20160505T130442.jpg", "rb") as f:
+            exifHeader.hide(f, outputBytes, secret_message=message)
 
-        clear_message = exifHeader.reveal(outputBytes)
-        self.assertEqual(message, clear_message)
+            clear_message = exifHeader.reveal(outputBytes)
+            self.assertEqual(message, clear_message)
 
     def tearDown(self):
         try:
             os.unlink("./image.jpg")
-        except:
+        except Exception:
             pass
         try:
             os.unlink("./image.png")
-        except:
+        except Exception:
             pass
 
-if __name__ == '__main__':
+
+if __name__ == "__main__":
     unittest.main()

tests/test_generators.py

@@ -1,8 +1,6 @@
 #!/usr/bin/env python
-#-*- coding: utf-8 -*-
-
-# Stéganô - Stéganô is a basic Python Steganography module.
-# Copyright (C) 2010-2017  Cédric Bonhomme - https://www.cedricbonhomme.org
+# Stegano - Stegano is a pure Python steganography module.
+# Copyright (C) 2010-2025 Cédric Bonhomme - https://www.cedricbonhomme.org
 #
 # For more information : https://github.com/cedricbonhomme/Stegano
 #
@@ -25,88 +23,179 @@ __date__ = "$Date: 2017/03/01 $"
 __revision__ = "$Date: 2017/03/01 $"
 __license__ = "GPLv3"
 
-import unittest
 import itertools
+import unittest
+
+import cv2
+import numpy as np
+
+from stegano.lsb import generators
 
-from stegano.lsbset import generators
 
 class TestGenerators(unittest.TestCase):
-
     def test_identity(self):
-        """Test the identity generator.
-        """
-        self.assertEqual(tuple(itertools.islice(generators.identity(), 15)),
-                        (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14))
+        """Test the identity generator."""
+        self.assertEqual(
+            tuple(itertools.islice(generators.identity(), 15)),
+            (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14),
+        )
 
     def test_fibonacci(self):
-        """Test the Fibonacci generator.
-        """
-        self.assertEqual(tuple(itertools.islice(generators.fibonacci(), 20)),
-                        (1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610,
-                        987, 1597, 2584, 4181, 6765, 10946))
+        """Test the Fibonacci generator."""
+        self.assertEqual(
+            tuple(itertools.islice(generators.fibonacci(), 20)),
+            (
+                1,
+                2,
+                3,
+                5,
+                8,
+                13,
+                21,
+                34,
+                55,
+                89,
+                144,
+                233,
+                377,
+                610,
+                987,
+                1597,
+                2584,
+                4181,
+                6765,
+                10946,
+            ),
+        )
 
     def test_eratosthenes(self):
-        """Test the Eratosthenes sieve.
-        """
-        self.assertEqual(tuple(itertools.islice(generators.eratosthenes(), 168)),
-                        (2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47,
-                        53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107,
-                        109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167,
-                        173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229,
-                        233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283,
-                        293, 307, 311, 313, 317, 331, 337, 347, 349, 353, 359,
-                        367, 373, 379, 383, 389, 397, 401, 409, 419, 421, 431,
-                        433, 439, 443, 449, 457, 461, 463, 467, 479, 487, 491,
-                        499, 503, 509, 521, 523, 541, 547, 557, 563, 569, 571,
-                        577, 587, 593, 599, 601, 607, 613, 617, 619, 631, 641,
-                        643, 647, 653, 659, 661, 673, 677, 683, 691, 701, 709,
-                        719, 727, 733, 739, 743, 751, 757, 761, 769, 773, 787,
-                        797, 809, 811, 821, 823, 827, 829, 839, 853, 857, 859,
-                        863, 877, 881, 883, 887, 907, 911, 919, 929, 937, 941,
-                        947, 953, 967, 971, 977, 983, 991, 997))
+        """Test the Eratosthenes sieve."""
+        with open("./tests/expected-results/eratosthenes") as f:
+            self.assertEqual(
+                tuple(itertools.islice(generators.eratosthenes(), 168)),
+                tuple(int(line) for line in f),
+            )
 
     def test_composite(self):
-        """Test the composite sieve.
-        """
-        self.assertEqual(tuple(itertools.islice(generators.composite(), 114)),
-                        (4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25,
-                        26, 27, 28, 30, 32, 33, 34, 35, 36, 38, 39, 40, 42, 44,
-                        45, 46, 48, 49, 50, 51, 52, 54, 55, 56, 57, 58, 60, 62,
-                        63, 64, 65, 66, 68, 69, 70, 72, 74, 75, 76, 77, 78, 80,
-                        81, 82, 84, 85, 86, 87, 88, 90, 91, 92, 93, 94, 95, 96,
-                        98, 99, 100, 102, 104, 105, 106, 108, 110, 111, 112,
-                        114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124,
-                        125, 126, 128, 129, 130, 132, 133, 134, 135, 136, 138,
-                        140, 141, 142, 143, 144, 145, 146, 147, 148, 150))
+        """Test the composite sieve."""
+        with open("./tests/expected-results/composite") as f:
+            self.assertEqual(
+                tuple(itertools.islice(generators.composite(), 114)),
+                tuple(int(line) for line in f),
+            )
 
     def test_fermat(self):
-        """Test the Fermat generator.
-        """
-        self.assertEqual(tuple(itertools.islice(generators.fermat(), 9)),
-                        (3, 5, 17, 257, 65537, 4294967297, 18446744073709551617,
-                        340282366920938463463374607431768211457,
-                        115792089237316195423570985008687907853269984665640564039457584007913129639937))
+        """Test the Fermat generator."""
+        with open("./tests/expected-results/fermat") as f:
+            self.assertEqual(
+                tuple(itertools.islice(generators.fermat(), 9)),
+                tuple(int(line) for line in f),
+            )
 
     def test_triangular_numbers(self):
-        """Test the Triangular numbers generator.
+        """Test the Triangular numbers generator."""
+        with open("./tests/expected-results/triangular_numbers") as f:
+            self.assertEqual(
+                tuple(itertools.islice(generators.triangular_numbers(), 54)),
+                tuple(int(line) for line in f),
+            )
+
+    def test_mersenne(self):
+        """Test the Mersenne generator."""
+        with open("./tests/expected-results/mersenne") as f:
+            self.assertEqual(
+                tuple(itertools.islice(generators.mersenne(), 20)),
+                tuple(int(line) for line in f),
+            )
+
+    def test_carmichael(self):
+        """Test the Carmichael generator."""
+        with open("./tests/expected-results/carmichael") as f:
+            self.assertEqual(
+                tuple(itertools.islice(generators.carmichael(), 33)),
+                tuple(int(line) for line in f),
+            )
+
+    def test_ackermann_slow(self):
+        """Test the Ackermann set."""
+        with open("./tests/expected-results/ackermann") as f:
+            self.assertEqual(generators.ackermann_slow(3, 1), int(f.readline()))
+            self.assertEqual(generators.ackermann_slow(3, 2), int(f.readline()))
+
+    def test_ackermann_naive(self):
+        """Test the Naive Ackermann generator"""
+        gen = generators.ackermann_naive(3)
+        next(gen)
+        with open("./tests/expected-results/ackermann") as f:
+            self.assertEqual(next(gen), int(f.readline()))
+            self.assertEqual(next(gen), int(f.readline()))
+
+    def test_ackermann_fast(self):
+        """Test the Ackermann set."""
+        with open("./tests/expected-results/ackermann") as f:
+            self.assertEqual(generators.ackermann_fast(3, 1), int(f.readline()))
+            self.assertEqual(generators.ackermann_fast(3, 2), int(f.readline()))
+            self.assertEqual(generators.ackermann_fast(4, 1), int(f.readline()))
+
+    def test_ackermann(self):
+        """Test the Ackermann generator"""
+        gen = generators.ackermann(3)
+        next(gen)
+        with open("./tests/expected-results/ackermann") as f:
+            self.assertEqual(next(gen), int(f.readline()))
+            self.assertEqual(next(gen), int(f.readline()))
+
+    def test_LFSR(self):
+        """Test the LFSR generator"""
+        with open("./tests/expected-results/LFSR") as f:
+            self.assertEqual(
+                tuple(itertools.islice(generators.LFSR(2**8), 256)),
+                tuple(int(line) for line in f),
+            )
+
+    def test_shi_tomashi(self):
+        """Test the Shi Tomashi generator"""
+
+        # The expected results are only for tests/sample-files/Montenach.png file and
+        # the below mentioned shi-tomashi configuration.
+        # If the values below are changed,
+        # please ensure the tests/expected-results/shi_tomashi.txt
+        # is also appropriately modified
+        # Using the shi_tomashi_reconfigure static method
+
+        image = cv2.imread("tests/sample-files/Montenach.png")
+        gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
+        corners = cv2.goodFeaturesToTrack(gray, 1000, 0.001, 10)
+        # Commented because min_distance argument of generators.shi_tomashi is now set
+        # to 10.0:
+        # corners = np.int0(corners)
+        corners = corners.reshape(corners.shape[0], -1)
+        test_file = np.loadtxt("tests/expected-results/shi_tomashi.txt")
+        test_file_reshaped = test_file.reshape(
+            int(test_file.shape[0]), int(test_file.shape[1])
+        )
+        res = np.testing.assert_allclose(corners, test_file_reshaped, rtol=1e-0, atol=0)  # type: ignore
+        self.assertIsNone(res)
+
+    @staticmethod
+    def shi_tomashi_reconfigure(
+        file_name: str,
+        max_corners: int = 1000,
+        quality: float = 0.001,
+        min_distance: int = 10,
+    ):
         """
-        self.assertEqual(tuple(itertools.islice(generators.triangular_numbers(), 54)),
-                        (0, 1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 66, 78, 91,
-                        105, 120, 136, 153, 171, 190, 210, 231, 253, 276, 300,
-                        325, 351, 378, 406, 435, 465, 496, 528, 561, 595, 630,
-                        666, 703, 741, 780, 820, 861, 903, 946, 990, 1035, 1081,
-                        1128, 1176, 1225, 1275, 1326, 1378, 1431))
-
-    # def test_mersenne(self):
-    #     """Test the Mersenne generator.
-    #     """
-    #     self.assertEqual(tuple(itertools.islice(generators.mersenne(), 20)),
-    #                     (3, 7, 31, 127, 2047, 8191, 131071, 524287, 8388607,
-    #                     536870911, 2147483647, 137438953471, 2199023255551,
-    #                     8796093022207, 140737488355327, 9007199254740991,
-    #                     576460752303423487, 2305843009213693951,
-    #                     147573952589676412927, 2361183241434822606847))
+        Method to update/reconfigure Shi-Tomashi for various images and configuration
+        """
+        image = cv2.imread(file_name)
+        gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
+        corners = cv2.goodFeaturesToTrack(gray, max_corners, quality, min_distance)
+        # Commented because min_distance argument of generators.shi_tomashi is now set
+        # to 10.0:
+        # corners = np.int0(corners)
+        corners = corners.reshape(corners.shape[0], -1)
+        np.savetxt("tests/expected-results/shi_tomashi.txt", corners)
 
 
-if __name__ == '__main__':
+if __name__ == "__main__":
     unittest.main()

tests/test_lsb.py

@@ -1,8 +1,6 @@
 #!/usr/bin/env python
-#-*- coding: utf-8 -*-
-
-# Stéganô - Stéganô is a basic Python Steganography module.
-# Copyright (C) 2010-2017  Cédric Bonhomme - https://www.cedricbonhomme.org
+# Stegano - Stegano is a pure Python steganography module.
+# Copyright (C) 2010-2024  Cédric Bonhomme - https://www.cedricbonhomme.org
 #
 # For more information : https://github.com/cedricbonhomme/Stegano
 #
@@ -20,134 +18,231 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>
 
 __author__ = "Cedric Bonhomme"
-__version__ = "$Revision: 0.3 $"
-__date__ = "$Date: 2016/04/12 $"
-__revision__ = "$Date: 2017/05/04 $"
+__version__ = "$Revision: 0.6 $"
+__date__ = "$Date: 2016/04/13 $"
+__revision__ = "$Date: 2022/01/04 $"
 __license__ = "GPLv3"
 
 import io
 import os
-import base64
 import unittest
 from unittest.mock import patch
 
 from stegano import lsb
+from stegano.lsb import generators
+
 
 class TestLSB(unittest.TestCase):
-
     def test_hide_empty_message(self):
         """
         Test hiding the empty string.
         """
         with self.assertRaises(AssertionError):
-            secret = lsb.hide("./tests/sample-files/Lenna.png", "")
+            lsb.hide("./tests/sample-files/Lenna.png", "", generators.eratosthenes())
 
-    def test_hide_and_reveal(self):
-        messages_to_hide = ['a', 'foo', 'Hello World!', ':Python:']
+    def test_hide_and_reveal_without_generator(self):
+        messages_to_hide = ["a", "foo", "Hello World!", ":Python:"]
         for message in messages_to_hide:
             secret = lsb.hide("./tests/sample-files/Lenna.png", message)
             secret.save("./image.png")
 
             clear_message = lsb.reveal("./image.png")
+
+            self.assertEqual(message, clear_message)
+
+    def test_hide_and_reveal_with_eratosthenes(self):
+        messages_to_hide = ["a", "foo", "Hello World!", ":Python:"]
+        for message in messages_to_hide:
+            secret = lsb.hide(
+                "./tests/sample-files/Lenna.png", message, generators.eratosthenes()
+            )
+            secret.save("./image.png")
+
+            clear_message = lsb.reveal("./image.png", generators.eratosthenes())
+
+            self.assertEqual(message, clear_message)
+
+    def test_hide_and_reveal_with_ackermann(self):
+        messages_to_hide = ["foo"]
+        for message in messages_to_hide:
+            secret = lsb.hide(
+                "./tests/sample-files/Lenna.png", message, generators.ackermann(m=3)
+            )
+            secret.save("./image.png")
+
+            clear_message = lsb.reveal("./image.png", generators.ackermann(m=3))
+
+            self.assertEqual(message, clear_message)
+
+    def test_hide_and_reveal_with_ackermann_naive(self):
+        messages_to_hide = ["foo"]
+        for message in messages_to_hide:
+            secret = lsb.hide(
+                "./tests/sample-files/Lenna.png",
+                message,
+                generators.ackermann_naive(m=2),
+            )
+            secret.save("./image.png")
+
+            clear_message = lsb.reveal("./image.png", generators.ackermann_naive(m=2))
+
+            self.assertEqual(message, clear_message)
+
+    def test_hide_and_reveal_with_mersenne(self):
+        messages_to_hide = ["f"]
+        for message in messages_to_hide:
+            secret = lsb.hide(
+                "./tests/sample-files/Montenach.png",
+                message,
+                generators.mersenne(),
+            )
+            secret.save("./image.png")
+
+            clear_message = lsb.reveal("./image.png", generators.mersenne())
+
+            self.assertEqual(message, clear_message)
+
+    def test_hide_and_reveal_with_shi_tomashi(self):
+        messages_to_hide = ["foo bar"]
+        for message in messages_to_hide:
+            secret = lsb.hide(
+                "./tests/sample-files/Lenna.png",
+                message,
+                generators.shi_tomashi("./tests/sample-files/Lenna.png"),
+            )
+            secret.save("./image.png")
+
+            clear_message = lsb.reveal(
+                "./image.png", generators.shi_tomashi("./tests/sample-files/Lenna.png")
+            )
+
+            self.assertEqual(message, clear_message)
+
+    def test_hide_and_reveal_with_shift(self):
+        messages_to_hide = ["a", "foo", "Hello World!", ":Python:"]
+        for message in messages_to_hide:
+            secret = lsb.hide(
+                "./tests/sample-files/Lenna.png", message, generators.eratosthenes(), 4
+            )
+            secret.save("./image.png")
+
+            clear_message = lsb.reveal("./image.png", generators.eratosthenes(), 4)
+
             self.assertEqual(message, clear_message)
 
     def test_hide_and_reveal_UTF32LE(self):
-        messages_to_hide = 'I love 🍕 and 🍫!'
-        secret = lsb.hide("./tests/sample-files/Lenna.png",
-                            messages_to_hide, 'UTF-32LE')
+        messages_to_hide = "I love 🍕 and 🍫!"
+        secret = lsb.hide(
+            "./tests/sample-files/Lenna.png",
+            messages_to_hide,
+            generators.eratosthenes(),
+            encoding="UTF-32LE",
+        )
         secret.save("./image.png")
 
-        clear_message = lsb.reveal("./image.png", 'UTF-32LE')
+        clear_message = lsb.reveal(
+            "./image.png", generators.eratosthenes(), encoding="UTF-32LE"
+        )
         self.assertEqual(messages_to_hide, clear_message)
 
     def test_with_transparent_png(self):
-        messages_to_hide = ['🍕', 'a', 'foo', 'Hello World!', ':Python:']
+        messages_to_hide = ["a", "foo", "Hello World!", ":Python:"]
         for message in messages_to_hide:
-            secret = lsb.hide("./tests/sample-files/transparent.png",
-                                message, 'UTF-32LE')
+            secret = lsb.hide(
+                "./tests/sample-files/transparent.png",
+                message,
+                generators.eratosthenes(),
+            )
             secret.save("./image.png")
 
-            clear_message = lsb.reveal("./image.png", 'UTF-32LE')
+            clear_message = lsb.reveal("./image.png", generators.eratosthenes())
 
             self.assertEqual(message, clear_message)
 
-    @patch('builtins.input', return_value='y')
+    @patch("builtins.input", return_value="y")
     def test_manual_convert_rgb(self, input):
-        message_to_hide = 'I love 🍕 and 🍫!'
-        secret = lsb.hide("./tests/sample-files/Lenna-grayscale.png",
-                            message_to_hide, 'UTF-32LE')
+        message_to_hide = "Hello World!"
+        lsb.hide(
+            "./tests/sample-files/Lenna-grayscale.png",
+            message_to_hide,
+            generators.eratosthenes(),
+        )
 
-    @patch('builtins.input', return_value='n')
+    @patch("builtins.input", return_value="n")
     def test_refuse_convert_rgb(self, input):
-        message_to_hide = 'I love 🍕 and 🍫!'
-        with self.assertRaises(Exception):
-            secret = lsb.hide("./tests/sample-files/Lenna-grayscale.png",
-                                    message_to_hide, 'UTF-32LE')
+        message_to_hide = "Hello World!"
+        # lsb.hide(
+        #         "./tests/sample-files/Lenna-grayscale.png",
+        #         message_to_hide,
+        #         generators.eratosthenes(),
+        #     )
+        with self.assertRaisesRegex(Exception, "Not a RGB image."):
+            lsb.hide(
+                "./tests/sample-files/Lenna-grayscale.png",
+                message_to_hide,
+                generators.eratosthenes(),
+            )
+
+    def test_with_location_of_image_as_argument(self):
+        messages_to_hide = ["Hello World!"]
+
+        for message in messages_to_hide:
+            outputBytes = io.BytesIO()
+            bytes_image = lsb.hide(
+                "./tests/sample-files/20160505T130442.jpg",
+                message,
+                generators.identity(),
+            )
+            bytes_image.save(outputBytes, "PNG")
+            outputBytes.seek(0)
+
+            clear_message = lsb.reveal(outputBytes, generators.identity())
+
+            self.assertEqual(message, clear_message)
 
     def test_auto_convert_rgb(self):
-        message_to_hide = 'I love 🍕 and 🍫!'
-        secret = lsb.hide("./tests/sample-files/Lenna-grayscale.png",
-                            message_to_hide, 'UTF-32LE', True)
-
-    def test_with_text_file(self):
-        text_file_to_hide = './tests/sample-files/lorem_ipsum.txt'
-        with open(text_file_to_hide) as f:
-            message = f.read()
-        secret = lsb.hide("./tests/sample-files/Lenna.png", message)
-        secret.save("./image.png")
-
-        clear_message = lsb.reveal("./image.png")
-        self.assertEqual(message, clear_message)
-
-    def test_with_binary_file(self):
-        binary_file_to_hide = "./tests/sample-files/free-software-song.ogg"
-        with open(binary_file_to_hide, "rb") as bin_file:
-            encoded_string = base64.b64encode(bin_file.read())
-            message = encoded_string.decode()
-        secret = lsb.hide("./tests/sample-files/Montenach.png", message)
-        secret.save("./image.png")
-
-        clear_message = lsb.reveal("./image.png")
-        clear_message += '==='
-        clear_message = base64.b64decode(clear_message)
-        with open('file1', 'wb') as f:
-            f.write(clear_message)
-        with open('file1', 'rb') as bin_file:
-            encoded_string = base64.b64encode(bin_file.read())
-            message1 = encoded_string.decode()
-        self.assertEqual(message, message1)
-        try:
-            os.unlink('./file1')
-        except:
-            pass
+        message_to_hide = "Hello World!"
+        lsb.hide(
+            "./tests/sample-files/Lenna-grayscale.png",
+            message_to_hide,
+            generators.eratosthenes(),
+            auto_convert_rgb=True,
+        )
 
     def test_with_too_long_message(self):
         with open("./tests/sample-files/lorem_ipsum.txt") as f:
             message = f.read()
-        message += message*2
-        with self.assertRaises(Exception):
-            lsb.hide("./tests/sample-files/Lenna.png", message)
+        message += message * 2
+        with self.assertRaisesRegex(
+            Exception, "The message you want to hide is too long:"
+        ):
+            lsb.hide("./tests/sample-files/Lenna.png", message, generators.identity())
 
-    def test_with_bytes(self):
-        messages_to_hide = ["a", "foo", "Hello World!", ":Python:"]
+    def test_hide_and_reveal_with_bad_generator(self):
+        message_to_hide = "Hello World!"
+        secret = lsb.hide(
+            "./tests/sample-files/Lenna.png", message_to_hide, generators.eratosthenes()
+        )
+        secret.save("./image.png")
 
-        for message in messages_to_hide:
-            message = "Hello World"
-            outputBytes = io.BytesIO()
-            bytes_image = lsb.hide(open("./tests/sample-files/20160505T130442.jpg", 'rb'), message)
-            bytes_image.save(outputBytes, "PNG")
-            outputBytes.seek(0)
+        with self.assertRaises(IndexError):
+            lsb.reveal("./image.png", generators.identity())
 
-            clear_message = lsb.reveal(outputBytes)
-
-            self.assertEqual(message, clear_message)
+    def test_with_unknown_generator(self):
+        message_to_hide = "Hello World!"
+        with self.assertRaises(AttributeError):
+            lsb.hide(
+                "./tests/sample-files/Lenna.png",
+                message_to_hide,
+                generators.unknown_generator(),  # type: ignore
+            )
 
     def tearDown(self):
         try:
             os.unlink("./image.png")
-        except:
+        except Exception:
             pass
 
 
-if __name__ == '__main__':
+if __name__ == "__main__":
     unittest.main()

tests/test_lsbset.py

@@ -1,130 +0,0 @@
-#!/usr/bin/env python
-#-*- coding: utf-8 -*-
-
-# Stéganô - Stéganô is a basic Python Steganography module.
-# Copyright (C) 2010-2017  Cédric Bonhomme - https://www.cedricbonhomme.org
-#
-# For more information : https://github.com/cedricbonhomme/Stegano
-#
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>
-
-__author__ = "Cedric Bonhomme"
-__version__ = "$Revision: 0.4 $"
-__date__ = "$Date: 2016/04/13 $"
-__revision__ = "$Date: 2017/05/04 $"
-__license__ = "GPLv3"
-
-import os
-import unittest
-from unittest.mock import patch
-
-from stegano import lsbset
-from stegano.lsbset import generators
-
-class TestLSBSet(unittest.TestCase):
-
-    def test_hide_empty_message(self):
-        """
-        Test hiding the empty string.
-        """
-        with self.assertRaises(AssertionError):
-            secret = lsbset.hide("./tests/sample-files/Lenna.png", "",
-                                    generators.eratosthenes())
-
-    def test_hide_and_reveal(self):
-        messages_to_hide = ["a", "foo", "Hello World!", ":Python:"]
-        for message in messages_to_hide:
-            secret = lsbset.hide("./tests/sample-files/Lenna.png", message,
-                                    generators.eratosthenes())
-            secret.save("./image.png")
-
-            clear_message = lsbset.reveal("./image.png",
-                                    generators.eratosthenes())
-
-            self.assertEqual(message, clear_message)
-
-    def test_hide_and_reveal_UTF32LE(self):
-        messages_to_hide = 'I love 🍕 and 🍫!'
-        secret = lsbset.hide("./tests/sample-files/Lenna.png",
-                            messages_to_hide,
-                            generators.eratosthenes(),
-                            'UTF-32LE')
-        secret.save("./image.png")
-
-        clear_message = lsbset.reveal("./image.png", generators.eratosthenes(),
-                                        'UTF-32LE')
-        self.assertEqual(messages_to_hide, clear_message)
-
-    def test_with_transparent_png(self):
-        messages_to_hide = ["a", "foo", "Hello World!", ":Python:"]
-        for message in messages_to_hide:
-            secret = lsbset.hide("./tests/sample-files/transparent.png",
-                                    message, generators.eratosthenes())
-            secret.save("./image.png")
-
-            clear_message = lsbset.reveal("./image.png",
-                                    generators.eratosthenes())
-
-            self.assertEqual(message, clear_message)
-
-    @patch('builtins.input', return_value='y')
-    def test_manual_convert_rgb(self, input):
-        message_to_hide = "Hello World!"
-        secret = lsbset.hide("./tests/sample-files/Lenna-grayscale.png",
-                                    message_to_hide, generators.eratosthenes())
-
-    @patch('builtins.input', return_value='n')
-    def test_refuse_convert_rgb(self, input):
-        message_to_hide = "Hello World!"
-        with self.assertRaises(Exception):
-            secret = lsbset.hide("./tests/sample-files/Lenna-grayscale.png",
-                                    message_to_hide, generators.eratosthenes())
-
-    def test_auto_convert_rgb(self):
-        message_to_hide = "Hello World!"
-        secret = lsbset.hide("./tests/sample-files/Lenna-grayscale.png",
-                            message_to_hide, generators.eratosthenes(),
-                            auto_convert_rgb=True)
-
-    def test_with_too_long_message(self):
-        with open("./tests/sample-files/lorem_ipsum.txt") as f:
-            message = f.read()
-        with self.assertRaises(Exception):
-            lsbset.hide("./tests/sample-files/Lenna.png", message,
-                                    generators.eratosthenes())
-
-    def test_hide_and_reveal_with_bad_generator(self):
-        message_to_hide = "Hello World!"
-        secret = lsbset.hide("./tests/sample-files/Lenna.png", message_to_hide,
-                                    generators.eratosthenes())
-        secret.save("./image.png")
-
-        with self.assertRaises(IndexError):
-            clear_message = lsbset.reveal("./image.png", generators.identity())
-
-    def test_with_unknown_generator(self):
-        message_to_hide = "Hello World!"
-        with self.assertRaises(AttributeError):
-            secret = lsbset.hide("./tests/sample-files/Lenna.png",
-                                    message_to_hide, generators.eratosthene())
-
-    def tearDown(self):
-        try:
-            os.unlink("./image.png")
-        except:
-            pass
-
-
-if __name__ == '__main__':
-    unittest.main()

tests/test_red.py

@@ -1,8 +1,6 @@
 #!/usr/bin/env python
-#-*- coding: utf-8 -*-
-
-# Stéganô - Stéganô is a basic Python Steganography module.
-# Copyright (C) 2010-2017  Cédric Bonhomme - https://www.cedricbonhomme.org
+# Stegano - Stegano is a pure Python steganography module.
+# Copyright (C) 2010-2025 Cédric Bonhomme - https://www.cedricbonhomme.org
 #
 # For more information : https://github.com/cedricbonhomme/Stegano
 #
@@ -29,14 +27,14 @@ import unittest
 
 from stegano import red
 
-class TestRed(unittest.TestCase):
 
+class TestRed(unittest.TestCase):
     def test_hide_empty_message(self):
         """
         Test hiding the empty string.
         """
         with self.assertRaises(AssertionError):
-            secret = red.hide("./tests/sample-files/Lenna.png", "")
+            red.hide("./tests/sample-files/Lenna.png", "")
 
     def test_hide_and_reveal(self):
         messages_to_hide = ["a", "foo", "Hello World!", ":Python:"]
@@ -47,7 +45,7 @@ class TestRed(unittest.TestCase):
 
             clear_message = red.reveal("./image.png")
 
-            self.assertEqual(message, message)
+            self.assertEqual(message, clear_message)
 
     def test_with_too_long_message(self):
         with open("./tests/sample-files/lorem_ipsum.txt") as f:
@@ -58,9 +56,9 @@ class TestRed(unittest.TestCase):
     def tearDown(self):
         try:
             os.unlink("./image.png")
-        except:
+        except Exception:
             pass
 
 
-if __name__ == '__main__':
+if __name__ == "__main__":
     unittest.main()

tests/test_steganalysis.py

@@ -0,0 +1,66 @@
+#!/usr/bin/env python
+
+# Stegano - Stegano is a pure Python steganography module.
+# Copyright (C) 2010-2017  Cédric Bonhomme - https://www.cedricbonhomme.org
+#
+# For more information : https://github.com/cedricbonhomme/Stegano
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>
+
+__author__ = "Cedric Bonhomme"
+__version__ = "$Revision: 0.9.4 $"
+__date__ = "$Date: 2019/06/06 $"
+__revision__ = "$Date: 2019/06/06 $"
+__license__ = "GPLv3"
+
+import unittest
+
+from PIL import Image, ImageChops
+
+from stegano import lsb
+from stegano.steganalysis import parity, statistics
+
+
+class TestSteganalysis(unittest.TestCase):
+    def test_parity(self):
+        """Test stegano.steganalysis.parity"""
+        text_file_to_hide = "./tests/sample-files/lorem_ipsum.txt"
+        with open(text_file_to_hide) as f:
+            message = f.read()
+        secret = lsb.hide("./tests/sample-files/Lenna.png", message)
+        analysis = parity.steganalyse(secret)
+        target = Image.open("./tests/expected-results/parity.png")
+        diff = ImageChops.difference(target, analysis).getbbox()
+        self.assertTrue(diff is None)
+
+    def test_parity_rgba(self):
+        """Test that stegano.steganalysis.parity works with RGBA images"""
+        img = Image.open("./tests/sample-files/transparent.png")
+        analysis = parity.steganalyse(img)
+        target = Image.open("./tests/expected-results/parity_rgba.png")
+        diff = ImageChops.difference(target, analysis).getbbox()
+        self.assertTrue(diff is None)
+
+    def test_statistics(self):
+        """Test stegano.steganalysis.statistics"""
+        image = Image.open("./tests/sample-files/Lenna.png")
+        stats = str(statistics.steganalyse(image)) + "\n"
+        file = open("./tests/expected-results/statistics")
+        target = file.read()
+        file.close()
+        self.assertEqual(stats, target)
+
+
+if __name__ == "__main__":
+    unittest.main()