mirror of
https://github.com/cedricbonhomme/Stegano.git
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248 lines
8.4 KiB
Python
248 lines
8.4 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://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: 0.6 $"
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__date__ = "$Date: 2016/04/13 $"
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__revision__ = "$Date: 2022/01/04 $"
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__license__ = "GPLv3"
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import io
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import os
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import unittest
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from unittest.mock import patch
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from stegano import lsb
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from stegano.lsb import generators
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class TestLSB(unittest.TestCase):
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def test_hide_empty_message(self):
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"""
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Test hiding the empty string.
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"""
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with self.assertRaises(AssertionError):
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lsb.hide("./tests/sample-files/Lenna.png", "", generators.eratosthenes())
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def test_hide_and_reveal_without_generator(self):
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messages_to_hide = ["a", "foo", "Hello World!", ":Python:"]
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for message in messages_to_hide:
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secret = lsb.hide("./tests/sample-files/Lenna.png", message)
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secret.save("./image.png")
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clear_message = lsb.reveal("./image.png")
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self.assertEqual(message, clear_message)
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def test_hide_and_reveal_with_eratosthenes(self):
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messages_to_hide = ["a", "foo", "Hello World!", ":Python:"]
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for message in messages_to_hide:
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secret = lsb.hide(
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"./tests/sample-files/Lenna.png", message, generators.eratosthenes()
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)
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secret.save("./image.png")
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clear_message = lsb.reveal("./image.png", generators.eratosthenes())
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self.assertEqual(message, clear_message)
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def test_hide_and_reveal_with_ackermann(self):
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messages_to_hide = ["foo"]
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for message in messages_to_hide:
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secret = lsb.hide(
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"./tests/sample-files/Lenna.png", message, generators.ackermann(m=3)
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)
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secret.save("./image.png")
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clear_message = lsb.reveal("./image.png", generators.ackermann(m=3))
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self.assertEqual(message, clear_message)
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def test_hide_and_reveal_with_ackermann_naive(self):
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messages_to_hide = ["foo"]
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for message in messages_to_hide:
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secret = lsb.hide(
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"./tests/sample-files/Lenna.png",
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message,
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generators.ackermann_naive(m=2),
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)
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secret.save("./image.png")
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clear_message = lsb.reveal("./image.png", generators.ackermann_naive(m=2))
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self.assertEqual(message, clear_message)
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def test_hide_and_reveal_with_mersenne(self):
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messages_to_hide = ["f"]
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for message in messages_to_hide:
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secret = lsb.hide(
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"./tests/sample-files/Montenach.png",
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message,
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generators.mersenne(),
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)
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secret.save("./image.png")
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clear_message = lsb.reveal("./image.png", generators.mersenne())
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self.assertEqual(message, clear_message)
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def test_hide_and_reveal_with_shi_tomashi(self):
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messages_to_hide = ["foo bar"]
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for message in messages_to_hide:
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secret = lsb.hide(
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"./tests/sample-files/Lenna.png",
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message,
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generators.shi_tomashi("./tests/sample-files/Lenna.png"),
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)
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secret.save("./image.png")
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clear_message = lsb.reveal(
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"./image.png", generators.shi_tomashi("./tests/sample-files/Lenna.png")
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)
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self.assertEqual(message, clear_message)
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def test_hide_and_reveal_with_shift(self):
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messages_to_hide = ["a", "foo", "Hello World!", ":Python:"]
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for message in messages_to_hide:
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secret = lsb.hide(
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"./tests/sample-files/Lenna.png", message, generators.eratosthenes(), 4
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)
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secret.save("./image.png")
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clear_message = lsb.reveal("./image.png", generators.eratosthenes(), 4)
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self.assertEqual(message, clear_message)
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def test_hide_and_reveal_UTF32LE(self):
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messages_to_hide = "I love 🍕 and 🍫!"
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secret = lsb.hide(
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"./tests/sample-files/Lenna.png",
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messages_to_hide,
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generators.eratosthenes(),
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encoding="UTF-32LE",
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)
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secret.save("./image.png")
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clear_message = lsb.reveal(
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"./image.png", generators.eratosthenes(), encoding="UTF-32LE"
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)
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self.assertEqual(messages_to_hide, clear_message)
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def test_with_transparent_png(self):
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messages_to_hide = ["a", "foo", "Hello World!", ":Python:"]
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for message in messages_to_hide:
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secret = lsb.hide(
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"./tests/sample-files/transparent.png",
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message,
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generators.eratosthenes(),
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)
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secret.save("./image.png")
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clear_message = lsb.reveal("./image.png", generators.eratosthenes())
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self.assertEqual(message, clear_message)
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@patch("builtins.input", return_value="y")
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def test_manual_convert_rgb(self, input):
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message_to_hide = "Hello World!"
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lsb.hide(
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"./tests/sample-files/Lenna-grayscale.png",
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message_to_hide,
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generators.eratosthenes(),
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)
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@patch("builtins.input", return_value="n")
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def test_refuse_convert_rgb(self, input):
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message_to_hide = "Hello World!"
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# lsb.hide(
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# "./tests/sample-files/Lenna-grayscale.png",
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# message_to_hide,
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# generators.eratosthenes(),
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# )
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with self.assertRaisesRegex(Exception, "Not a RGB image."):
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lsb.hide(
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"./tests/sample-files/Lenna-grayscale.png",
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message_to_hide,
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generators.eratosthenes(),
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)
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def test_with_location_of_image_as_argument(self):
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messages_to_hide = ["Hello World!"]
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for message in messages_to_hide:
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outputBytes = io.BytesIO()
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bytes_image = lsb.hide(
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"./tests/sample-files/20160505T130442.jpg",
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message,
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generators.identity(),
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)
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bytes_image.save(outputBytes, "PNG")
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outputBytes.seek(0)
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clear_message = lsb.reveal(outputBytes, generators.identity())
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self.assertEqual(message, clear_message)
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def test_auto_convert_rgb(self):
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message_to_hide = "Hello World!"
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lsb.hide(
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"./tests/sample-files/Lenna-grayscale.png",
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message_to_hide,
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generators.eratosthenes(),
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auto_convert_rgb=True,
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)
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def test_with_too_long_message(self):
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with open("./tests/sample-files/lorem_ipsum.txt") as f:
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message = f.read()
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message += message * 2
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with self.assertRaisesRegex(
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Exception, "The message you want to hide is too long:"
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):
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lsb.hide("./tests/sample-files/Lenna.png", message, generators.identity())
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def test_hide_and_reveal_with_bad_generator(self):
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message_to_hide = "Hello World!"
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secret = lsb.hide(
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"./tests/sample-files/Lenna.png", message_to_hide, generators.eratosthenes()
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)
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secret.save("./image.png")
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with self.assertRaises(IndexError):
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lsb.reveal("./image.png", generators.identity())
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def test_with_unknown_generator(self):
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message_to_hide = "Hello World!"
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with self.assertRaises(AttributeError):
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lsb.hide(
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"./tests/sample-files/Lenna.png",
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message_to_hide,
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generators.unknown_generator(), # type: ignore
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)
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def tearDown(self):
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try:
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os.unlink("./image.png")
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except Exception:
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pass
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if __name__ == "__main__":
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unittest.main()
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