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87 lines
2.9 KiB
Python
Executable file
87 lines
2.9 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) 2010-2017 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: 0.2 $"
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__date__ = "$Date: 2010/10/01 $"
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__revision__ = "$Date: 2017/02/06 $"
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__license__ = "GPLv3"
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import sys
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from PIL import Image
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from typing import Union, IO
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def hide(input_image: Union[str, IO[bytes]], message: str):
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"""
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Hide a message (string) in an image.
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Use the red portion of a pixel (r, g, b) tuple to
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hide the message string characters as ASCII values.
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The red value of the first pixel is used for message_length of the string.
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"""
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message_length = len(message)
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assert message_length != 0, "message message_length is zero"
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assert message_length < 255, "message is too long"
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img = Image.open(input_image)
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# Use a copy of image to hide the text in
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encoded = img.copy()
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width, height = img.size
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index = 0
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for row in range(height):
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for col in range(width):
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(r, g, b) = img.getpixel((col, row))
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# first value is message_length of message
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if row == 0 and col == 0 and index < message_length:
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asc = message_length
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elif index <= message_length:
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c = message[index -1]
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asc = ord(c)
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else:
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asc = r
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encoded.putpixel((col, row), (asc, g , b))
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index += 1
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img.close()
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return encoded
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def reveal(input_image: Union[str, IO[bytes]]):
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"""
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Find a message in an image.
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Check the red portion of an pixel (r, g, b) tuple for
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hidden message characters (ASCII values).
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The red value of the first pixel is used for message_length of string.
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"""
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img = Image.open(input_image)
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width, height = img.size
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message = ""
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index = 0
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for row in range(height):
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for col in range(width):
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r, g, b = img.getpixel((col, row))
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# First pixel r value is length of message
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if row == 0 and col == 0:
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message_length = r
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elif index <= message_length:
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message += chr(r)
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index += 1
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img.close()
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return message
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