def __recover_message(self, mediate_length, key):
"""
After extraction is completed, call this method to decode and extract original message.
:param mediate_length: the mediate length of hidden message (necessary to perform decoding)
:return: extracted message
"""
if not mediate_length:
mediate_length = mediate_length
if mediate_length <= 0:
raise AttributeError('Necessary argument not specified!')
if len(self.message_to_proc_part) > mediate_length:
self.message_to_proc_part = self.message_to_proc_part[:mediate_length]
elif len(self.message_to_proc_part) < mediate_length:
raise RuntimeError("Couldn't extract message with provided argument.")
# print self.message_to_proc_part.tolist()
s = int(math.ceil(math.sqrt(len(self.message_to_proc_part) / StegoCore.BITS)))
try:
msg_matrix_encoded_array = np.reshape(self.message_to_proc_part, (s, s, StegoCore.BITS))
except ValueError:
print colorize("Wrong session key. Can't extract message.", COLORS.FAIL)
return ''
msg_matrix_encoded = sh.bits_matrix_to_int_matrix(msg_matrix_encoded_array)
msg_matrix = QMatrix.decode_matrix_message(msg_matrix_encoded, key)
msg = sh.matrix_to_message(msg_matrix)
return msg
def __configure_for_stream_mode(self, stream_mode, **kwargs):
"""
Configure session for specified stream mode
:param stream_mode:
:param kwargs:
:return:
"""
print "Configurating..."
self.stream_mode = stream_mode
if stream_mode == StreamMode.StreamFromFileToFile:
# file to file
input = kwargs[KEY_INPUT_FILE_NAME]
self.stego_mode = kwargs[KEY_STEGO_MODE]
self.file_source = wave.open(input, 'rb')
if self.stego_mode == StegoMode.Hide:
self.output_wave_file = wave.open(kwargs[KEY_OUTPUT_FILE_NAME],
'wb')
self.output_wave_file.setnchannels(
self.file_source.getnchannels())
self.output_wave_file.setsampwidth(
self.file_source.getsampwidth())
self.output_wave_file.setframerate(
self.file_source.getframerate())
self.enable_processing = True
elif stream_mode == StreamMode.StreamFromBuildInInputToSoundFlower:
# build-in input to sound flower
self.stego_mode = StegoMode.Hide
elif stream_mode == StreamMode.StreamFromSoundFlowerToBuildInOutput:
# sound flower to build-in output
self.stego_mode = StegoMode.Recover
else:
print colorize("Unsupported stream mode! [%i]" % self.stream_mode,
COLORS.FAIL)
def __hide(self, chunk_source, chunk_container):
"""
Hide message part in container
:param chunk: chunk to be used as container
:return: processed or the original chunk
"""
container_processed, self.message_to_proc_part = self.gsc.hide(chunk_source, chunk_container, self.message_to_proc_part)
if not len(self.message_to_proc_part):
print colorize("Message integrated.", COLORS.OKBLUE)
return chunk_source, container_processed
def scan(self):
"""
Begin synchronization and message extraction.
"""
if not (self.stream_mode
== StreamMode.StreamFromSoundFlowerToBuildInOutput
or self.stream_mode == StreamMode.StreamFromFileToFile):
print colorize("Not applicable for current stream mode!",
COLORS.FAIL)
return
print colorize("Begin scanning...", COLORS.OKGREEN)
self.enable_processing = True
def deserialize(self, filename=SETTINGS_FILE_NAME):
if os.path.isfile(filename):
with open(filename, 'r') as infile:
data = json.load(infile)
self.frames_to_skip = data[SETTING_KEY_FRAMES_TO_SKIP]
self.frame_size = data[SETTINGS_KEY_FRAME_SIZE]
self.sync_mark = data[SETTINGS_KEY_SYNC_MARK]
self.security_or_capacity = data[SETTINGS_SECURITY_OR_CAPACITY]
self.build_in_input_audio_device_name = data[SETTINGS_KEY_BUILD_IN_INPUT]
self.build_in_output_audio_device_name = data[SETTINGS_KEY_BUILD_IN_OUTPUT]
self.virtual_audio_device_name = data[SETTINGS_KEY_VIRTUAL_DEVICE]
else:
print colorize("%s couldn't be found. Applying default settings." % SETTINGS_FILE_NAME, COLORS.FAIL)
self.serialize()
self.deserialize()
def do_connect(self, line):
"""
Create session with specified mode.
usage:
connect m=<mode>&d=<debug>
:param mode:
0 - record sound from mic, hide message and redirect it to SoundFlower virtual device
1 - receive sound from SoundFlower virtual device, recover message and play it in dynamics
:param debug
0 - false (default)
1 - true
"""
args = urlparse.parse_qs(line)
try:
mode = int(args['m'][0])
except KeyError:
mode = 0
try:
self.debug = bool(args['d'][0])
if self.debug:
print colorize("Debug mode.", COLORS.WARNING)
except KeyError:
pass
if not (mode == StreamMode.StreamFromBuildInInputToSoundFlower
or mode == StreamMode.StreamFromSoundFlowerToBuildInOutput):
self.print_err(inspect.currentframe().f_code.co_name.replace(
'do_', ''))
return
# load settings
settings = StegoSettings.Instance()
settings.deserialize()
if settings.validate_stream_mode(mode):
self.session = StegoScramblerSession(
mode, **{
StegoCore.SYNC_MARK_KEY: settings.sync_mark,
StegoCore.SECURITY_OR_CAPACITY:
settings.security_or_capacity
})
self.session.open_stream()
else:
print colorize(
"There are no supported audio devices for current stream mode.",
COLORS.FAIL)
def recover(self, session_key, user_key, msg_file_name):
"""
Extract and decode message, save it to file
:param session_key:
:param user_key:
:return:
"""
if not (self.stream_mode
== StreamMode.StreamFromSoundFlowerToBuildInOutput
or self.stream_mode == StreamMode.StreamFromFileToFile):
print colorize("Not applicable for current stream mode!",
COLORS.FAIL)
return
message = self.core.recover(session_key, user_key)
gs_io.save_message_to_file(msg_file_name, message)
if not message == '':
print colorize("Message recovered.", COLORS.OKGREEN)
def __init__(self, stego_mode, **kwargs):
"""
Init core class instance.
:param stego_mode: StegoMode.Hide or StegoMode.Recover
:param kwargs:
1) StegoMode.Hide - necessary keys:
a) StegoCore.SKIP_FRAMES_KEY - number of frames to skip before integration [optional]
b) StegoCore.SYNC_MARK_KEY - text marker to perform synchronization [optional]
2) StegoMode.Recover - optional key:
a) StegoCore.SKIP_FRAMES_KEY - number of frames to skip before integration [optional]
b) StegoCore.SYNC_MARK_KEY - text marker to perform synchronization [optional]
"""
self.stego_mode = stego_mode # encode or decode
self.message_to_proc_part = np.empty(0, dtype=np.int8) # the part of message that left to be integrated
self.skip_frames = 0 # how many frames shoud be skipped
self.mediate_length = 0 # length of message to recover (length of bits array)
self.security_or_capacity = 0
# synchronization
self.sync_mark = '' # synchronization mark
self.sync_mark_encoded_array = np.empty(0, dtype=np.int8) # synchronization mark encoded
self.sync_mark_temp_encoded_array = [] # list that may contain sync mark
if stego_mode == StegoMode.Hide:
if StegoCore.SKIP_FRAMES_KEY in kwargs:
# set number of frames to skip
self.skip_frames = kwargs[StegoCore.SKIP_FRAMES_KEY]
else:
if StegoCore.SKIP_FRAMES_KEY in kwargs:
# set number of frames to skip
self.skip_frames = kwargs[StegoCore.SKIP_FRAMES_KEY]
if StegoCore.SYNC_MARK_KEY in kwargs:
self.sync_mark = kwargs[StegoCore.SYNC_MARK_KEY]
self.__synchronization_prepare()
if StegoCore.SECURITY_OR_CAPACITY in kwargs:
self.security_or_capacity = kwargs[StegoCore.SECURITY_OR_CAPACITY]
self.gsc = gsc_core.PyCore(self.sync_mark_encoded_array, 1024, 3 * 1024, self.security_or_capacity)
else:
print colorize("Error: no sync mark provided", COLORS.FAIL)
def hide(self,
msg_file_name,
key,
recover_info_filename=RECOVER_INFO_DEFAULT_FILE_NAME):
"""
Load message and call core method to begin integration.
:param msg_file_name: file name of the file with message
:param key: key to encode message
"""
if not (self.stream_mode
== StreamMode.StreamFromBuildInInputToSoundFlower
or self.stream_mode == StreamMode.StreamFromFileToFile):
print colorize("Not applicable for current stream mode!",
COLORS.FAIL)
# load mesage
message = gs_io.load_message_from_file(msg_file_name)
if not message == '':
print colorize("Begin integration...", COLORS.OKBLUE)
session_key = self.core.hide(message, key)
gs_io.save_data_to_recover(recover_info_filename, session_key)
self.enable_processing = True
else:
print colorize("Wrong or empty file with message!", COLORS.FAIL)
def print_err(self, fa_name):
print colorize("Wrong arguments. Type `help " + fa_name + "`",
COLORS.FAIL)
def __init__(self):
cmd.Cmd.__init__(self)
self.session = None
self.debug = False
print colorize("Welcome!", COLORS.WARNING)
def main(opts):
input_container_file_name = ''
message_file_name = ''
output_container_file_name = ''
key = -1
message_length = -1
recover_info_file_name = RECOVER_INFO_DEFAULT_FILE_NAME
# --------------------------------------
# print colorize("Debug mode.", COLORS.WARNING)
# # --------------------------------------
# hide = True
# #hide = False
# # --------------------------------------
# if hide:
# # --------------------------------------
# input_container_file_name = "wav/input.wav"
# message_file_name = "data/msg.txt"
# output_container_file_name = "wav/output.wav"
# key = 7
# recover_info_file_name = "data/recover_info.txt"
# # --------------------------------------
# else:
# # --------------------------------------
# input_container_file_name = "wav/output.wav"
# message_file_name = "data/msg_recovered.txt"
# key = 7
# recover_info_file_name = "data/recover_info.txt"
# # --------------------------------------
# --------------------------------------
for opt, arg in opts:
if opt == '-h':
print_usage()
sys.exit()
elif opt in ("-i", "--ifile"):
input_container_file_name = arg
elif opt in ("-m", "--mfile"):
message_file_name = arg
elif opt in ("-o", "--ofile"):
output_container_file_name = arg
elif opt in ("-k", "--key"):
key = int(arg)
elif opt in ("-l", "--length"):
message_length = int(arg)
elif opt in ("-r", "--recover_info"):
recover_info_file_name = arg
if input_container_file_name == '' or message_file_name == '':
print_usage()
sys.exit()
if not output_container_file_name == '':
# --------------------------------------
# hide
# --------------------------------------
# load settings
settings = StegoSettings.Instance()
settings.deserialize()
if settings.validate_stream_mode(StreamMode.StreamFromFileToFile):
stego_session = StegoScramblerSession(
StreamMode.StreamFromFileToFile, **{
KEY_STEGO_MODE: StegoMode.Hide,
KEY_INPUT_FILE_NAME: input_container_file_name,
KEY_OUTPUT_FILE_NAME: output_container_file_name,
StegoCore.SKIP_FRAMES_KEY: settings.frames_to_skip,
StegoCore.SYNC_MARK_KEY: settings.sync_mark,
StegoCore.SECURITY_OR_CAPACITY:
settings.security_or_capacity
})
stego_session.open_stream()
stego_session.hide(message_file_name, key)
else:
print "There are no supported audio devices for current stream mode."
# --------------------------------------
else:
if message_length <= 0:
message_length = gs_io.load_data_to_recover(recover_info_file_name)
if message_length > 0:
# --------------------------------------
# recover
# --------------------------------------
# load settings
settings = StegoSettings.Instance()
settings.deserialize()
if settings.validate_stream_mode(StreamMode.StreamFromFileToFile):
stego_session = StegoScramblerSession(
StreamMode.StreamFromFileToFile, **{
KEY_STEGO_MODE:
StegoMode.Recover,
KEY_INPUT_FILE_NAME:
input_container_file_name,
StegoCore.SKIP_FRAMES_KEY:
settings.frames_to_skip,
StegoCore.SYNC_MARK_KEY:
settings.sync_mark,
StegoCore.SECURITY_OR_CAPACITY:
settings.security_or_capacity
})
stego_session.open_stream()
stego_session.scan()
else:
print "There are no supported audio devices for current stream mode."
# --------------------------------------
else:
print_usage()
sys.exit()
try:
while stego_session.stream.is_active():
time.sleep(0.1)
except KeyboardInterrupt:
pass
finally:
if stego_session.stego_mode == StegoMode.Recover:
session_key = gs_io.load_data_to_recover(recover_info_file_name)
try:
stego_session.recover(session_key, key, message_file_name)
except AttributeError:
pass
except ValueError:
pass
except RuntimeError:
pass
stego_session.close_stream()
print colorize('Done!', COLORS.WARNING)
sys.exit(0)
def open_stream(self):
# instantiate PyAudio
self.p_audio = pyaudio.PyAudio()
if self.stream_mode == StreamMode.StreamFromFileToFile:
print colorize("Opening file stream...", COLORS.WARNING)
# file to file
format, channels, rate = self.p_audio.get_format_from_width(self.file_source.getsampwidth()), \
self.file_source.getnchannels(), self.file_source.getframerate()
input_dev_idx = gs_device_info.detect_build_in_input_device_idx(
self.p_audio)
output_dev_idx = gs_device_info.detect_build_in_output_device_idx(
self.p_audio)
enable_input, enable_output = False, True
elif self.stream_mode == StreamMode.StreamFromBuildInInputToSoundFlower:
print colorize("Opening stream...", COLORS.OKBLUE)
# build-in input to sound flower
format, channels, rate = FORMAT, CHANNELS, RATE
input_dev_idx = gs_device_info.detect_build_in_input_device_idx(
self.p_audio)
output_dev_idx = gs_device_info.detect_virtual_audio_device_idx(
self.p_audio)
enable_input, enable_output = True, True
elif self.stream_mode == StreamMode.StreamFromSoundFlowerToBuildInOutput:
print colorize("Opening stream...", COLORS.OKGREEN)
# sound flower to build-in output
format, channels, rate = FORMAT, CHANNELS, RATE
input_dev_idx = gs_device_info.detect_virtual_audio_device_idx(
self.p_audio)
output_dev_idx = gs_device_info.detect_build_in_output_device_idx(
self.p_audio)
enable_input, enable_output = True, True
else:
print colorize("Unsupported stream mode! [%i]" % self.stream_mode,
COLORS.FAIL)
raise ValueError("Unsupported stream mode! [%i]" %
self.stream_mode)
settings = StegoSettings.Instance()
print colorize("Input device: %i" % input_dev_idx, COLORS.WARNING)
print colorize("Output device: %i" % output_dev_idx, COLORS.WARNING)
print colorize(
"Format: {0}, Channels: {1}, Rate: {2}, Frame size: {3}".format(
format, channels, rate, settings.frame_size), COLORS.WARNING)
# standard L-R stereo
channel_map = (0, 1)
try:
stream_info = pyaudio.PaMacCoreStreamInfo(
flags=pyaudio.PaMacCoreStreamInfo.paMacCorePlayNice, # default
channel_map=channel_map)
except AttributeError:
print colorize(
"Sorry, couldn't find PaMacCoreStreamInfo. Make sure that "
"you're running on OS X.", COLORS.FAIL)
sys.exit(-1)
if gs_device_info.validate_audio_setup(self.p_audio, format, channels,
rate, input_dev_idx):
self.stream = self.p_audio.open(
format=format,
channels=channels,
rate=rate,
frames_per_buffer=settings.frame_size,
input=enable_input,
output=enable_output,
output_host_api_specific_stream_info=stream_info,
input_device_index=input_dev_idx,
output_device_index=output_dev_idx,
stream_callback=self.__recording_callback)
self.stream.start_stream()
src_latency = 1000.0 * self.stream.get_input_latency()
buffer_latency = 1000.0 * settings.frame_size / rate
dst_latency = 1000.0 * self.stream.get_output_latency()
total_latency = buffer_latency + dst_latency + src_latency
print colorize(
"Expected delay: %0.1f ms (src: %0.1f, buf: %0.1f, dst: %0.1f)"
% (total_latency, src_latency, buffer_latency, dst_latency),
COLORS.WARNING)
else:
print colorize("Unsupported audio configuration!", COLORS.FAIL)
raise ValueError("Unsupported audio configuration!")
