def test_steganogrified_name():
"""Data will be hidden in a file with steganogrified at the end, when no output file name is provided."""
clean_message_image = copy2(
CLEAN_PNG_LOCATION,
CLEAN_PNG_LOCATION[:-4] + "_test_message_steganogrified_name.png")
clean_file_image = copy2(
CLEAN_PNG_LOCATION,
CLEAN_PNG_LOCATION[:-4] + "_test_file_steganogrified_name.png")
hidden_message = "Hidden text from test_steganogrified_name."
file_to_hide = "tests/FileToHide.zip"
stegs = Steganographer()
hidden_message_fname = stegs.steganographer_hide(clean_message_image,
hidden_message)
steganogrified_message_fname = clean_message_image[:-4] + "Steganogrified.png"
hidden_file_fname = stegs.steganographer_hide_file(clean_file_image,
file_to_hide)
steganogrified_file_fname = clean_file_image[:-4] + "Steganogrified.png"
assert hidden_message_fname == steganogrified_message_fname
assert os.path.isfile(steganogrified_message_fname)
assert hidden_file_fname == steganogrified_file_fname
assert os.path.isfile(steganogrified_file_fname)
os.remove(clean_message_image)
os.remove(hidden_message_fname)
os.remove(clean_file_image)
os.remove(hidden_file_fname)
def test_unicode_inverse():
"""Unicode characters are hidden and revealed."""
message = "test_unicode hidden message. Some random unicode characters: ЊЂѕ рЙе нЁ н╣ п╗ яЌ ▀џ ЯцЎ рЃџ рїЕ рЈю"
stegs = Steganographer()
assert message == stegs.steganographer_reveal(
stegs.steganographer_hide(CLEAN_PNG_LOCATION, message,
"tests/dirtyImage.png"))[0].decode('utf-8')
def test_steganographer_inverse(hidden_message):
"""Steganographer_reveal reveals what was hidden by steganographer_hide."""
clean_image = CLEAN_PNG_LOCATION
dirty_image = "tests/dirtyImage_test_steganographer_inverse.png"
stegs = Steganographer()
revealed_message = stegs.steganographer_reveal(
stegs.steganographer_hide(clean_image, hidden_message,
dirty_image))[0].decode('utf-8')
assert revealed_message == hidden_message
os.remove(dirty_image)
def test_steganographer_hide_name():
"""The image a string is hidden in is the correct one."""
clean_image = CLEAN_PNG_LOCATION
dirty_image = "tests/dirtyImage_test_steganographer_hide_name.png"
hidden_message = "Hidden text from test_steganographer_hide_name."
stegs = Steganographer()
hidden_fname = stegs.steganographer_hide(clean_image, hidden_message,
dirty_image)
assert hidden_fname == dirty_image
os.remove(dirty_image)
def test_stegs_hide_string_nonsense():
"""A random string, that can cause a decode error, will correctly be hidden in a new image."""
clean_image = CLEAN_PNG_LOCATION
dirty_image = "tests/dirtyImage_test_steganographer_hide_string_nonsense.png"
hidden_message = "─юљАЉ─ю─ю─ю─ю─ю─ю─ю─ю─юнг─ю\U000fc423─ю─ю─ю─юнг─ю─ю─юнгнг─юнг\U000fc423─юнг\U000fc423нгнг─ю\U000fc423нг─юнгљАЋљАЋљАЉљАЋљАЋљАЋљАЉљАЋљАЉљАЋљАЉ"
stegs = Steganographer()
hidden_fname = stegs.steganographer_hide(clean_image, hidden_message,
dirty_image)
with open(clean_image, 'rb') as clean, open(hidden_fname, 'rb') as dirty:
assert clean.read() != dirty.read()
assert compare_images(clean_image, hidden_fname) < 650
try:
Image.open(hidden_fname)
except OSError:
pytest.fail("Image is corrupt " + hidden_fname)
os.remove(dirty_image)
def test_steganographer_hide_string():
"""A string will correctly be hidden in a new image."""
clean_image = CLEAN_PNG_LOCATION
dirty_image = "tests/dirtyImage_test_steganographer_hide_string.png"
hidden_message = "Hidden text from test_steganographer_hide_string."
stegs = Steganographer()
hidden_fname = stegs.steganographer_hide(clean_image, hidden_message,
dirty_image)
with open(clean_image, 'rb') as clean, open(hidden_fname, 'rb') as dirty:
assert clean.read() != dirty.read()
assert compare_images(clean_image, hidden_fname) < 500
try:
Image.open(hidden_fname)
except OSError:
pytest.fail("Image is corrupt " + hidden_fname)
os.remove(dirty_image)
def main():
"""Given an image and a message or file steganographer will hide the message or file in the bits of the image."""
parser = argparse.ArgumentParser(
description=
"hides a message in a file or returns a message hidden in a file")
parser.add_argument(
"input",
help="file to hide a message in or file to reveal a message from")
parser.add_argument("-m",
"--message",
help="message to be hidden in the input file")
parser.add_argument(
"-o",
"--output",
help=
"name of output file to hide message in or to write revealed message",
default='')
parser.add_argument("-f",
"--file",
help="file to be hidden in the input file")
parser.add_argument("-r",
"--reveal",
action='store_true',
help="a file will be revealed")
parser.add_argument("-v",
"--version",
action='version',
version="steganographer {}".format(
pkg_resources.get_distribution('pip').version),
help="show version and exit")
args = parser.parse_args()
stegs = Steganographer()
# There is a message to hide.
if args.message:
hidden_fname = stegs.steganographer_hide(args.input, args.message,
args.output)
print("The message has been hidden in " + hidden_fname)
# There is a file to hide.
elif args.file:
hidden_fname = stegs.steganographer_hide_file(args.input, args.file,
args.output)
print("The file " + args.file + " has been hidden in " + hidden_fname)
# Revealing a file.
elif args.reveal:
revealed_data, file_name = stegs.steganographer_reveal(args.input)
if args.output:
file_name = args.output
with open(file_name, 'wb') as rev_file:
rev_file.write(revealed_data)
print("The hidden file was revealed in " + file_name)
# Revealing a message.
else:
hidden_message = stegs.steganographer_reveal(
args.input)[0].decode('utf-8')
if args.output:
open(args.output, 'w', encoding='utf-8').write(hidden_message)
print("The hidden message was written to " + args.output)
else:
try:
print("The hidden message was...\n" + hidden_message)
except UnicodeEncodeError: # pragma: no cover
output_name = args.input.split('.')[0] + '_message.txt'
print(
"The hidden message contains unsupported unicode characters and cannot be fully displayed "
+ "here. The correct message has been written to",
output_name)
print(hidden_message.encode('utf-8'))
open(output_name, 'w', encoding='utf-8').write(hidden_message)
