mirror of
https://github.com/cedricbonhomme/Stegano.git
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89 lines
2.5 KiB
Python
89 lines
2.5 KiB
Python
#!/usr/bin/env python
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# Stegano - Stegano is a pure Python steganography module.
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# Copyright (C) 2010-2024 Cédric Bonhomme - https://www.cedricbonhomme.org
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#
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# For more information : https://git.sr.ht/~cedric/stegano
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>
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__author__ = "Cedric Bonhomme"
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__version__ = "$Revision: 0.7 $"
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__date__ = "$Date: 2016/03/13 $"
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__revision__ = "$Date: 2019/05/31 $"
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__license__ = "GPLv3"
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from typing import IO, Iterator, Union
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from stegano import tools
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from .generators import identity
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def hide(
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image: Union[str, IO[bytes]],
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message: str,
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generator: Union[None, Iterator[int]] = None,
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shift: int = 0,
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encoding: str = "UTF-8",
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auto_convert_rgb: bool = False,
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):
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"""Hide a message (string) in an image with the
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LSB (Least Significant Bit) technique.
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"""
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hider = tools.Hider(image, message, encoding, auto_convert_rgb)
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width = hider.encoded_image.width
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if not generator:
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generator = identity()
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while shift != 0:
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next(generator)
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shift -= 1
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while hider.encode_another_pixel():
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generated_number = next(generator)
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col = generated_number % width
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row = int(generated_number / width)
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hider.encode_pixel((col, row))
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return hider.encoded_image
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def reveal(
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encoded_image: Union[str, IO[bytes]],
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generator: Union[None, Iterator[int]] = None,
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shift: int = 0,
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encoding: str = "UTF-8",
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):
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"""Find a message in an image (with the LSB technique)."""
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revealer = tools.Revealer(encoded_image, encoding)
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width = revealer.encoded_image.width
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if not generator:
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generator = identity()
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while shift != 0:
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next(generator)
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shift -= 1
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while True:
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generated_number = next(generator)
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col = generated_number % width
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row = int(generated_number / width)
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if revealer.decode_pixel((col, row)):
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return revealer.secret_message
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