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https://github.com/cedricbonhomme/Stegano.git
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113 lines
3.3 KiB
Python
Executable file
113 lines
3.3 KiB
Python
Executable file
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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# Stéganô - Stéganô is a basic Python Steganography module.
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# Copyright (C) 2010-2016 Cédric Bonhomme - https://www.cedricbonhomme.org
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#
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# For more information : https://github.com/cedricbonhomme/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: 0.1 $"
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__date__ = "$Date: 2010/10/01 $"
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__license__ = "GPLv3"
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import base64
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from functools import reduce
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def a2bits(chars):
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"""
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Converts a string to its bits representation as a string of 0's and 1's.
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>>> a2bits("Hello World!")
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'010010000110010101101100011011000110111100100000010101110110111101110010011011000110010000100001'
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"""
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return bin(reduce(lambda x, y : (x<<8)+y, (ord(c) for c in chars), 1))[3:]
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def a2bits_list(chars):
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"""
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Convert a string to its bits representation as a list of 0's and 1's.
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>>> a2bits_list("Hello World!")
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['01001000',
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'01100101',
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'01101100',
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'01101100',
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'01101111',
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'00100000',
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'01010111',
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'01101111',
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'01110010',
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'01101100',
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'01100100',
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'00100001']
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>>> "".join(a2bits_list("Hello World!"))
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'010010000110010101101100011011000110111100100000010101110110111101110010011011000110010000100001'
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"""
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return [bin(ord(x))[2:].rjust(8,"0") for x in chars]
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def bs(s):
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"""
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Converts an int to its bits representation as a string of 0's and 1's.
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"""
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return str(s) if s<=1 else bs(s>>1) + str(s&1)
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def setlsb(component, bit):
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"""
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Set Least Significant Bit of a colour component.
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"""
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return component & ~1 | int(bit)
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def n_at_a_time(items, n, fillvalue):
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"""
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Returns an iterator which groups n items at a time.
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Any final partial tuple will be padded with the fillvalue
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>>> list(n_at_a_time([1, 2, 3, 4, 5], 2, 'X'))
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[(1, 2), (3, 4), (5, 'X')]
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"""
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it = iter(items)
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return its.izip_longest(*[it] * n, fillvalue=fillvalue)
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def binary2base64(binary_file):
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"""
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Convert a binary file (OGG, executable, etc.) to a
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printable string.
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"""
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# Use mode = "rb" to read binary file
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fin = open(binary_file, "rb")
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binary_data = fin.read()
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fin.close()
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# Encode binary to base64 string (printable)
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return base64.b64encode(binary_data)
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"""fout = open(output_file, "w")
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fout.write(b64_data)
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fout.close"""
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def base642binary(b64_fname):
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"""
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Convert a printable file to a binary file.
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"""
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# Read base64 string
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#fin = open(b64_fname, "r")
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#b64_str = fin.read()
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#fin.close()
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# Decode base64 string to original binary sound object
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b64_fname += b'==='
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return base64.decodestring(b64_fname)
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#return base64.b64decode(b64_fname)
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