def embed_or_extract(algorithm, filename, destfilename, message, para, embed):
"""This function gets as parameters
filename ... the input file name
destfilename ... the output filen ame
message ... the message
para ... the parameter for the chosen algorithm
embed ... boolean: if True, we embed, else we extract.
If embed is True it uses libstego to embed the given message
in the given output file, calling the <algorithm>_embed()
function in libstego.
If embed is False, it uses libstego to extract a message
from the given file, calling the <algorithm>_extract()
function in libstego.
This function can therefor be called recursively to check
if embedding a message worked by calling it with embed=False.
"""
ending = filename[-3:]
print ending
if embed:
msglen = len(message) + 1
else:
message = libstego.new_charp()
msglen = libstego.new_intp()
if ending == "gif":
src_data = libstegofile.palette_data_t()
stego_data = libstegofile.palette_data_t()
gif_int = libstegofile.gif_internal_data_t()
libstegofile.io_gif_read(filename, src_data, gif_int)
if algorithm == "Sort / Unsort":
if embed:
libstego.sortunsort_embed(src_data, stego_data, message, msglen, para)
else:
libstego.sortunsort_extract(src_data, message, msglen, para)
elif algorithm == "GifShuffle":
if embed:
if para.method == 1:
pw_message = para.password
pw_message_len = para.pwlen
para.password = ""
para.pwlen = 0
pwmsg_data = libstegofile.palette_data_t()
para.method = 0
libstego.gifshuffle_embed(src_data, pwmsg_data, pw_message, pw_message_len, para)
para.method = 1
libstego.gifshuffle_embed(pwmsg_data, stego_data, message, msglen, para)
else:
print "normal gifshuffle:"
print "pw: " + para.password
print "pwlen: " + str(para.pwlen)
libstego.gifshuffle_embed(src_data, stego_data, message, msglen, para)
else:
if para.method == 1:
pw_message = para.password
pw_message_len = para.pwlen
para.password = ""
para.pwlen = 0
pwmsg_data = libstegofile.palette_data_t()
para.method = 0
libstego.gifshuffle_embed(src_data, pwmsg_data, pw_message, pw_message_len, para)
para.adv_pal = pwmsg_data
para.method = 1
libstego.gifshuffle_extract(src_data, message, msglen, para)
else:
libstego.gifshuffle_extract(src_data, message, msglen, para)
elif algorithm == "Frirui":
if embed:
libstego.frirui_embed(src_data, stego_data, message, msglen, para)
else:
libstego.frirui_extract(src_data, message, msglen, para)
if embed:
print "integrate and write ..."
libstegofile.io_gif_integrate(gif_int, stego_data)
libstegofile.io_gif_write(destfilename, gif_int)
# libstegofile.io_gif_cleanup_data(stego_data)
# libstegofile.io_gif_cleanup_data(src_data)
# libstegofile.io_gif_cleanup_internal(gif_int)
elif ending == "png":
src_data = libstegofile.rgb_data_t()
stego_data = libstegofile.rgb_data_t()
png_int = libstegofile.png_internal_data_t()
libstegofile.io_png_read(filename, src_data, png_int)
if algorithm == "Battlesteg":
if embed:
libstego.battlesteg_embed(src_data, stego_data, message, msglen, para)
else:
libstego.battlesteg_extract(src_data, message, msglen, para)
elif algorithm == "CPT":
if embed:
libstego.cpt_embed(src_data, stego_data, message, msglen, para)
else:
libstego.cpt_extract(src_data, message, msglen, para)
elif algorithm == "LSB":
bytes = libstego.new_charpp()
num_bytes = libstego.new_intp()
stego_data = src_data
libstego.lsb_convert_png(stego_data, bytes, num_bytes)
if embed:
ret = libstego.lsb_embed_indirect(
libstego.charpp_value(bytes), libstego.intp_value(num_bytes), message, msglen, para
)
if ret != 0:
print "An error occured. Error code: " + ` libstego.cvar.lstg_errno `
return False
else:
ret = libstego.lsb_extract_indirect(
libstego.charpp_value(bytes), libstego.intp_value(num_bytes), message, msglen, para
)
if ret != 0:
print "An error occured. Error code: " + ` libstego.cvar.lstg_errno `
return False
libstego.lsb_cleanup_converted_data(libstego.charpp_value(bytes))
libstego.delete_charpp(bytes)
if embed:
libstegofile.io_png_integrate(png_int, stego_data)
libstegofile.io_png_write(destfilename, png_int)
libstegofile.io_png_cleanup_data(stego_data)
# png cleanup ruft segmentation faults hervor...
# libstegofile.io_png_cleanup_data(src_data)
# libstegofile.io_png_cleanup_internal(png_int)
elif ending == "svg":
src_data = libstegofile.svg_data_t()
stego_data = libstegofile.svg_data_t()
svg_int = libstegofile.svg_internal_data_t()
libstegofile.io_svg_read(filename, src_data, svg_int)
if algorithm == "SVG Steg":
if embed:
ret = libstego.svg_embed(src_data, stego_data, message, msglen, para)
if ret != 0:
print "An error occured. Error code: " + ` libstego.cvar.lstg_errno `
return False
else:
ret = libstego.svg_extract(src_data, message, msglen, para)
if ret != 0:
print "An error occured. Error code: " + ` libstego.cvar.lstg_errno `
return False
if embed:
libstegofile.io_svg_integrate(svg_int, stego_data)
libstegofile.io_svg_write(destfilename, svg_int)
libstegofile.io_svg_cleanup_data(stego_data)
libstegofile.io_svg_cleanup_data(src_data)
libstegofile.io_svg_cleanup_internal(svg_int)
elif ending == "wav":
src_data = libstegofile.wav_data_t()
stego_data = libstegofile.wav_data_t()
wav_int = libstegofile.wav_internal_data_t()
libstegofile.io_wav_read(filename, src_data, svg_int)
if algorithm == "Echo Hiding":
if embed:
libstego.echohiding_embed(src_data, stego_data, message, msglen, para)
else:
libstego.echohiding_extract(src_data, message, msglen, para)
elif algorithm == "Phase Coding":
if embed:
libstego.phasecoding_embed(src_data, stego_data, message, msglen, para)
else:
libstego.phasecoding_extract(src_data, message, msglen, para)
libstegofile.io_wav_integrate(wav_int, stego_data)
libstegofile.io_wav_write(destfilename, wav_int)
libstegofile.io_wav_cleanup_data(stego_data)
libstegofile.io_wav_cleanup_data(src_data)
libstegofile.io_wav_cleanup_internal(wav_int)
elif ending == "jpg" or "peg":
src_data = libstegofile.jpeg_data_t()
stego_data = libstegofile.jpeg_data_t()
jpg_int = libstegofile.jpeg_internal_data_t()
libstegofile.io_jpeg_read(filename, src_data, jpg_int)
if algorithm == "F5":
if embed:
libstego.f5_embed(src_data, stego_data, message, msglen, para)
else:
libstego.f5_extract(src_data, message, msglen, para)
elif algorithm == "MB2":
if embed:
libstego.mb2_embed(src_data, stego_data, message, msglen, para)
else:
libstego.mb2_extract(src_data, message, msglen, para)
libstegofile.io_jpeg_integrate(jpg_int, stego_data)
libstegofile.io_jpeg_write(destfilename, jpg_int)
# libstegofile.io_jpeg_cleanup_data(stego_data)
libstegofile.io_jpeg_cleanup_data(src_data)
libstegofile.io_jpeg_cleanup_internal(jpg_int)
# TODO: extract for testing purpose!
if embed:
return True
else:
new_message = str(libstego.charp_value(message))
length = libstego.intp_value(msglen)
print new_message
return new_message
def get_capacity(algorithm, filename, para):
"""This function gets parameters
algorithm ... the String naming the chosen algorithm
filename ... the chosen input filename
para ... a parameter for the chosen algorithm
and computes the capacity of the algorithm for the
given file and parameters.
It returns the capacity.
"""
if filename[-3:] == "gif":
palette_data = libstegofile.palette_data_t()
gif_struct = libstegofile.gif_internal_data_t()
bla = libstegofile.io_gif_read(filename, palette_data, gif_struct)
if algorithm == "Frirui":
cap = libstego.frirui_check_capacity(palette_data, para)
elif algorithm == "GifShuffle":
cap = libstego.gifshuffle_check_capacity(palette_data, para)
elif algorithm == "Sort / Unsort":
cap = libstego.sortunsort_check_capacity(palette_data, para)
libstegofile.io_gif_cleanup_data(palette_data)
# libstegofile.io_gif_cleanup_internal(gif_struct)
elif filename[-3:] == "png":
rgb_data = libstegofile.rgb_data_t()
rgb_internal = libstegofile.png_internal_data_t()
bla = libstegofile.io_png_read(filename, rgb_data, rgb_internal)
if algorithm == "Battlesteg":
cap = libstego.battlesteg_check_capacity(rgb_data, para)
elif algorithm == "CPT":
cap = libstego.cpt_check_capacity(rgb_data, para)
elif algorithm == "LSB":
bytes = libstego.new_charpp()
num_bytes = libstego.new_intp()
libstego.lsb_convert_png(rgb_data, bytes, num_bytes)
cap = libstego.lsb_check_capacity_indirect(
libstego.charpp_value(bytes), libstego.intp_value(num_bytes), para
)
libstego.lsb_cleanup_converted_data(libstego.charpp_value(bytes))
libstego.delete_charpp(bytes)
elif filename[-3:] == "wav":
wav_data = wav_data_t()
wav_int = wav_internal_data_t()
bla = libstegofile.io_wav_read(filename, wav_data, wav_int)
if algorithm == "Echo Hiding":
cap = libstego.echohiding_check_capacity(wav_data, para)
elif algorithm == "Phase Coding":
cap = libstego.phasecoding_check_capacity(wav_data, para)
elif algorithm == "PW":
cap = libstego.pw_check_capacity(wav_data, para)
elif filename[-3:] == "svg":
svg_data = libstegofile.svg_data_t()
svg_int = libstegofile.svg_internal_data_t()
bla = libstegofile.io_svg_read(filename, svg_data, svg_int)
if algorithm == "SVG Steg":
cap = libstego.svg_check_capacity(svg_data, para)
elif filename[-3:] in ["peg", "jpg"]:
jpeg_data = libstegofile.jpeg_data_t()
jpeg_int = libstegofile.jpeg_internal_data_t()
bla = libstegofile.io_jpeg_read(filename, jpeg_data, jpeg_int)
if algorithm == "F5":
cap = libstego.f5_check_capacity(jpeg_data, para)
elif algorithm == "MB2":
cap = libstego.mb2_check_capacity(jpeg_data, para)
elif algorithm == "PQ":
cap = libstego.pq_check_capacity(jpeg_data, para)
elif algorithm == "LSB":
cap = libstego.lsb_check_capacity(palette_data, para)
print cap
if cap[0] == 0:
return cap[1]
else:
print "Error computing capacity!"
return 666
def embed_or_extract_with_method(embed, method, filename, destfilename, message, msglen):
if embed:
print "embedding with method " + `method+1` + ", algo: " + method_to_algo[method]
else:
p_message = libstego.new_charp()
p_msglen = libstego.new_intp()
print "extracting with method " + `method+1` + ", algo: " + method_to_algo[method]
if method_to_algo[method] == "PQ":
# prepare data strucures
jpeg_data = libstegofile.jpeg_data_t()
stego_data = libstegofile.jpeg_data_t()
jpeg_int = libstegofile.jpeg_internal_data_t()
# read file data
err = libstegofile.io_jpeg_read(filename, jpeg_data, jpeg_int)
if err != 0:
# TODO better error handling
print "Error while reading JPG"
return
para = methods[method]
if embed:
err = libstego.pq_embed(jpeg_data, stego_data, message, len(message) + 1, para)
if err == 0:
err = libstegofile.io_jpeg_integrate(jpeg_int, stego_data)
if err != 0:
print "Error while integrating JPEG"
err = libstegofile.io_jpeg_write(destfilename, jpeg_int)
if err != 0:
print "Error while writing JPEG"
else:
print "An error occured while embedding with PQ."
else:
err = libstego.pq_extract(jpeg_data, p_message, p_msglen, para)
if err != 0:
print "An error occured while extracting with PQ."
# cleanup
libstegofile.io_jpeg_cleanup_data(jpeg_data)
libstegofile.io_jpeg_cleanup_data(stego_data)
libstegofile.io_jpeg_cleanup_internal_data(jpeg_int)
elif method_to_algo[method] == "F5":
# prepare data strucures
jpeg_data = libstegofile.jpeg_data_t()
stego_data = libstegofile.jpeg_data_t()
jpeg_int = libstegofile.jpeg_internal_data_t()
# read file data
err = libstegofile.io_jpeg_read(filename, jpeg_data, jpeg_int)
if err != 0:
# TODO better error handling
print "Error while reading JPG"
return
para = methods[method]
if embed:
err = libstego.f5_embed(jpeg_data, stego_data, message, len(message) + 1, para)
if err == 0:
err = libstegofile.io_jpeg_integrate(jpg_int, stego_data)
err = libstegofile.io_jpeg_write(destfilename, jpeg_int)
else:
print "Error while embedding with F5."
else:
err = libstego.f5_extract(jpeg_data, p_message, p_msglen, para)
if err != 0:
print "Error while extracting with F5."
# cleanup
libstegofile.jpeg_cleanup_data(jpeg_data)
libstegofile.io_jpeg_cleanup_data(stego_data)
libstegofile.io_jpeg_cleanup_internal_data(jpeg_int)
elif method_to_algo[method] == "Adv. Gifshuffle":
# prepare data strucures
palette_data = libstegofile.palette_data_t()
stego_data = libstegofile.palette_data_t()
gif_int = libstegofile.gif_internal_data_t()
# read file data
err = libstegofile.io_gif_read(filename, palette_data, gif_int)
if err != 0:
# TODO better error handling
print "Error while reading GIF"
return
para = methods[method]
if embed:
pw_message = para.password
pw_message_len = para.pwlen
para.password = ""
para.pwlen = 0
pwmsg_data = libstegofile.palette_data_t()
para.method = 0
err = libstego.gifshuffle_embed(palette_data, pwmsg_data, pw_message,
pw_message_len, para)
para.method = 1
err = libstego.gifshuffle_embed(pwmsg_data, stego_data,
message, msglen, para)
err = libstegofile.io_gif_integrate(gif_int, stego_data)
err = libstegofile.io_gif_write(destfilename, gif_int)
else:
pw_message = para.password
pw_message_len = para.pwlen
para.password = ""
para.pwlen = 0
pwmsg_data = libstegofile.palette_data_t()
para.method = 0
err = libstego.gifshuffle_embed(palette_data, pwmsg_data, pw_message,
pw_message_len, para)
para.adv_pal = pwmsg_data
para.method = 1
err = libstego.gifshuffle_extract(palette_data, p_message, p_msglen, para)
# cleanup
libstegofile.io_gif_cleanup_data(stego_data)
libstegofile.io_gif_cleanup_data(palette_data)
libstegofile.io_gif_cleanup_internal(gif_int)
elif method_to_algo[method] == "Gifshuffle":
# prepare data strucures
palette_data = libstegofile.palette_data_t()
stego_data = libstegofile.palette_data_t()
gif_int = libstegofile.gif_internal_data_t()
# read file data
err = libstegofile.io_gif_read(filename, palette_data, gif_int)
if err != 0:
# TODO better error handling
print "Error while reading GIF"
return
para = methods[method]
if embed:
err = libstego.gifshuffle_embed(palette_data, stego_data, message, msglen, para)
err = libstegofile.io_gif_integrate(gif_int, stego_data)
err = libstegofile.io_gif_write(destfilename, gif_int)
else:
err = libstego.gifshuffle_extract(palette_data, p_message, p_msglen, para)
# cleanup
libstegofile.io_gif_cleanup_data(stego_data)
libstegofile.io_gif_cleanup_data(palette_data)
libstegofile.io_gif_cleanup_internal(gif_int)
elif method_to_algo[method] == "Frirui":
# prepare data strucures
palette_data = libstegofile.palette_data_t()
stego_data = libstegofile.palette_data_t()
gif_int = libstegofile.gif_internal_data_t()
# read file data
err = libstegofile.io_gif_read(filename, palette_data, gif_int)
if err != 0:
# TODO better error handling
print "Error while reading GIF"
return
para = methods[method]
if embed:
err = libstego.frirui_embed(palette_data, stego_data, message, msglen, para)
err = libstegofile.io_gif_integrate(gif_int, stego_data)
err = libstegofile.io_gif_write(destfilename, gif_int)
else:
err = libstego.frirui_extract(palette_data, p_message, p_msglen, para)
# cleanup
libstegofile.io_gif_cleanup_data(stego_data)
libstegofile.io_gif_cleanup_data(palette_data)
libstegofile.io_gif_cleanup_internal(gif_int)
elif method_to_algo[method] == "Sort/Unsort":
# prepare data strucures
palette_data = libstegofile.palette_data_t()
stego_data = libstegofile.palette_data_t()
gif_int = libstegofile.gif_internal_data_t()
# read file data
err = libstegofile.io_gif_read(filename, palette_data, gif_int)
if err != 0:
# TODO better error handling
print "Error while reading GIF"
return
para = methods[method]
if embed:
libstego.sortunsort_embed(palette_data, stego_data, message, msglen, para)
err = libstegofile.io_gif_integrate(gif_int, stego_data)
err = libstegofile.io_gif_write(destfilename, gif_int)
else:
libstego.sortunsort_extract(palette_data, p_message, p_msglen, para)
# cleanup
libstegofile.io_gif_cleanup_data(stego_data)
libstegofile.io_gif_cleanup_data(palette_data)
libstegofile.io_gif_cleanup_internal(gif_int)
elif method_to_algo[method] == "CPT":
# prepare data strucures
rgb_data = libstegofile.rgb_data_t()
stego_data = libstegofile.rgb_data_t()
png_int = libstegofile.png_internal_data_t()
# read file data
err = libstegofile.io_png_read(filename, rgb_data, png_int)
if err != 0:
# TODO better error handling
print "Error while reading PNG"
return
para = methods[method]
if embed:
print(para.password)
print(para.pwlen)
print(para.block_width)
print(para.block_height)
err = libstego.cpt_embed(rgb_data, stego_data, message, msglen, para)
if err == 0:
err = libstegofile.io_png_integrate(png_int, stego_data)
err = libstegofile.io_png_write(destfilename, png_int)
else:
err = libstego.cpt_extract(rgb_data, p_message, p_msglen, para)
# cleanup
libstegofile.io_png_cleanup_data(rgb_data)
libstegofile.io_png_cleanup_data(stego_data)
libstegofile.io_png_cleanup_internal(png_int)
elif method_to_algo[method] == "Battlesteg":
# prepare data strucures
rgb_data = libstegofile.rgb_data_t()
stego_data = libstegofile.rgb_data_t()
png_int = libstegofile.png_internal_data_t()
# read file data
err = libstegofile.io_png_read(filename, rgb_data, png_int)
if err != 0:
# TODO better error handling
print "Error while reading PNG"
return
para = methods[method]
if embed:
err = libstego.battlesteg_embed(rgb_data, stego_data, message, msglen, para)
if err == 0:
err = libstegofile.io_png_integrate(png_int, stego_data)
err = libstegofile.io_png_write(destfilename, png_int)
else:
err = libstego.battlesteg_extract(rgb_data, p_message, p_msglen, para)
# cleanup
libstegofile.io_png_cleanup_data(rgb_data)
libstegofile.io_png_cleanup_data(stego_data)
libstegofile.io_png_cleanup_internal(png_int)
elif method_to_algo[method] == "SVG Steg":
# prepare data strucures
svg_data = libstegofile.svg_data_t()
svg_stego = libstegofile.svg_data_t()
svg_int = libstegofile.svg_internal_data_t()
# read file data
err = libstegofile.io_svg_read(filename, svg_data, svg_int)
if err != 0:
# TODO better error handling
print "Error while reading SVG"
return
para = methods[method]
if embed:
err = libstego.svg_embed(svg_data, stego_data, message, msglen, para)
if err == 0:
err = libstegofile.io_svg_integrate(svg_int, stego_data)
if err != 0:
print "Error while integrating SVG"
err = libstegofile.io_svg_write(destfilename, svg_int)
if err != 0:
print "Error while writing SVG"
else:
print "Error while embedding with SVG Stego"
else:
err = libstego.svg_extract(svg_data, p_message, p_msglen, para)
if err != 0:
print "Error while extracting with SVG Stego"
# cleanup
libstegofile.svg_cleanup_data(svg_data)
libstegofile.svg_cleanup_data(stego_data)
libstegofile.svg_cleanup_internal(svg_int)
elif method_to_algo[method] == "Echo Hiding":
# prepare data strucures
wav_data = libstegofile.wav_data_t()
stego_data = libstegofile.wav_data_t()
wav_int = libstegofile.wav_internal_data_t()
# read file data
err = libstegofile.io_wav_read(filename, wav_data, wav_int)
if err != 0:
# TODO better error handling
print "Error while reading WAV"
return
para = methods[method]
if embed:
err = libstego.eh_embed(wav_data, stego_data, message, msglen, para)
if err == 0:
err = libstegofile.io_wav_integrate(wav_int, stego_data)
if err != 0:
print "Error while integrating WAV"
err = libstegofile.io_wav_write(destfilename, wav_int)
if err != 0:
print "Error while writing WAV"
else:
print "Error while embedding with Echo Hiding"
else:
err = libstego.eh_extract(wav_data, p_message, p_msglen, para)
if err != 0:
print "Error while extracting with Echo Hiding"
# cleanup
libstegofile.wav_cleanup_data(wav_data)
libstegofile.wav_cleanup_data(stego_data)
libstegofile.wav_cleanup_internal(wav_int)
elif method_to_algo[method] == "Phase Coding":
# TODO implement
pass
elif method_to_algo[method] == "LSB":
# TODO implement
pass
if embed:
return None
else:
message = str(libstego.charp_value(p_message))
print message
msglen = libstego.intp_value(p_msglen)
return message
def get_best_method(filename, msglen):
global num_methods
global method_to_algo
global methods
for method in range(0, num_methods):
fits = False
para = methods[method]
print "Testing method " + `method+1`
print "Algorithm: " + method_to_algo[method]
if method_to_algo[method] == "PQ":
# prepare data strucures
jpeg_data = libstegofile.jpeg_data_t()
jpeg_int = libstegofile.jpeg_internal_data_t()
# read file data
err = libstegofile.io_jpeg_read(filename, jpeg_data, jpeg_int)
if err != 0:
# TODO better error handling -> detailed message what went wrong
# by using the 'lstg_errno' code
return None
# check if message fits with the current params
if libstego.pq_check_capacity(jpeg_data, para) >= msglen:
fits = True
# cleanup
libstegofile.io_jpeg_cleanup_data(jpeg_data)
libstegofile.io_jpeg_cleanup_internal_data(jpeg_int)
elif method_to_algo[method] == "F5":
# prepare data strucures
jpeg_data = libstegofile.jpeg_data_t()
jpeg_int = libstegofile.jpeg_internal_data_t()
# read file data
err = libstegofile.io_jpeg_read(filename, jpeg_data, jpeg_int)
if err != 0:
# TODO better error handling -> detailed message what went wrong
# by using the 'lstg_errno' code
return None
# check if message fits with the current params
if libstego.f5_check_capacity(jpeg_data) >= msglen:
fits = True
# cleanup
libstegofile.io_jpeg_cleanup_data(jpeg_data)
libstegofile.io_jpeg_cleanup_internal_data(jpeg_int)
elif method_to_algo[method] in ["Adv. Gifshuffle", "Gifshuffle"]:
# prepare data strucures
palette_data = libstegofile.palette_data_t()
gif_int = libstegofile.gif_internal_data_t()
# read file data
err = libstegofile.io_gif_read(filename, palette_data, gif_int)
if err != 0:
# TODO better error handling -> detailed message what went wrong
# by using the 'lstg_errno' code
return None
# check if message fits with the current params
if libstego.gifshuffle_check_capacity(palette_data, para) >= msglen:
fits = True
# cleanup
libstegofile.io_gif_cleanup_data(palette_data)
libstegofile.io_gif_cleanup_internal(gif_int)
elif method_to_algo[method] == "Frirui":
# prepare data strucures
palette_data = libstegofile.palette_data_t()
gif_int = libstegofile.gif_internal_data_t()
# read file data
err = libstegofile.io_gif_read(filename, palette_data, gif_int)
if err != 0:
# TODO better error handling -> detailed message what went wrong
# by using the 'lstg_errno' code
return None
# check if message fits with the current params
if libstego.frirui_check_capacity(palette_data, para) >= msglen:
fits = True
# cleanup
libstegofile.io_gif_cleanup_data(palette_data)
libstegofile.io_gif_cleanup_internal(gif_int)
elif method_to_algo[method] == "Sort/Unsort":
# prepare data strucures
palette_data = libstegofile.palette_data_t()
gif_int = libstegofile.gif_internal_data_t()
# read file data
err = libstegofile.io_gif_read(filename, palette_data, gif_int)
if err != 0:
# TODO better error handling -> detailed message what went wrong
# by using the 'lstg_errno' code
return None
# check if message fits with the current params
if libstego.sortunsort_check_capacity(palette_data, para) >= msglen:
fits = True
# cleanup
libstegofile.io_gif_cleanup_data(palette_data)
libstegofile.io_gif_cleanup_internal(gif_int)
elif method_to_algo[method] == "CPT":
# prepare data strucures
rgb_data = libstegofile.rgb_data_t()
png_int = libstegofile.png_internal_data_t()
# read file data
err = libstegofile.io_png_read(filename, rgb_data, png_int)
if err != 0:
# TODO better error handling -> detailed message what went wrong
# by using the 'lstg_errno' code
return None
# check if message fits with the current params
if libstego.cpt_check_capacity(rgb_data, para) >= msglen:
fits = True
# cleanup
libstegofile.io_png_cleanup_data(rgb_data)
libstegofile.io_png_cleanup_internal(png_int)
elif method_to_algo[method] == "Battlesteg":
# prepare data strucures
rgb_data = libstegofile.rgb_data_t()
png_int = libstegofile.png_internal_data_t()
# read file data
err = libstegofile.io_png_read(filename, rgb_data, png_int)
if err != 0:
# TODO better error handling -> detailed message what went wrong
# by using the 'lstg_errno' code
return None
# check if message fits with the current params
if libstego.battlesteg_check_capacity(rgb_data, para) >= msglen:
fits = True
# cleanup
libstegofile.io_png_cleanup_data(rgb_data)
libstegofile.io_png_cleanup_internal(png_int)
elif method_to_algo[method] == "SVG Steg":
# prepare data strucures
svg_data = libstegofile.svg_data_t()
svg_int = libstegofile.svg_internal_data_t()
# read file data
err = libstegofile.io_svg_read(filename, svg_data, svg_int)
if err != 0:
# TODO better error handling -> detailed message what went wrong
# by using the 'lstg_errno' code
return None
# check if message fits with the current params
if libstego.svg_check_capacity(svg_data, para) >= msglen:
fits = True
# cleanup
libstegofile.io_svg_cleanup_data(svg_data)
libstegofile.io_svg_cleanup_internal(svg_int)
elif method_to_algo[method] == "Echo Hiding":
# prepare data strucures
wav_data = libstegofile.wav_data_t()
wav_int = libstegofile.wav_internal_data_t()
# read file data
err = libstegofile.io_wav_read(filename, wav_data, wav_int)
if err != 0:
# TODO better error handling -> detailed message what went wrong
# by using the 'lstg_errno' code
return None
# check if message fits with the current params
if libstego.eh_check_capacity(wav_data, para) >= msglen:
fits = True
# cleanup
libstegofile.io_wav_cleanup_data(wav_data)
libstegofile.io_wav_cleanup_internal(wav_int)
elif method_to_algo[method] == "Phase Coding":
# TODO implement
pass
elif method_to_algo[method] == "LSB":
# TODO implement
pass
if fits:
print "best method: " + `method+1`
return method
return None
def get_algorithm(filename, msglen, password):
if filename.endswith("jpeg") or filename.endswith("jpg"):
# PQ, F5, LSB
jpeg_data = libstegofile.jpeg_data_t()
jpeg_int = libstegofile.jpeg_internal_data_t()
err = libstegofile.io_jpeg_read(filename,jpeg_data, jpeg_int)
#TODO: ERROR (everywhere)
para = libstegofile.pq_parameter()
para.header_size = 0
para.quality = 0
if libstego.pq_check_capacity(jpeg_data, para) >= msglen:
libstegofile.jpeg_cleanup_data(jpeg_data)
libstegofile.io_jpeg_cleanup_internal(jpg_int)
return ["PQ",para]
para = libstegofile.f5_parameter()
if libstego.f5_check_capacity(jpeg_data, para) >= msglen:
libstegofile.jpeg_cleanup_data(jpeg_data)
libstegofile.io_jpeg_cleanup_internal(jpg_int)
return ["F5",para]
para = libstegofile.lsb_parameter()
# if libstego.lsb_check_capacity(jpeg_data, para) >= msglen:
# libstegofile.jpeg_cleanup_data(jpeg_data)
# libstegofile.io_jpeg_cleanup_internal(jpg_int)
# return ["LSB",para]
libstegofile.jpeg_cleanup_data(jpeg_data)
libstegofile.io_jpeg_cleanup_internal(jpg_int)
return
elif filename.endswith("gif"):
# AdvGifshuffle, Gifshuffle, Frirui, Sort/Unsort, LSB
palette_data = libstegofile.palette_data_t()
gif_int = libstegofile.gif_internal_data_t()
err = libstegofile.io_gif_read(filename, palette_data, gif_int)
para = libstegofile.gifshuffle_parameter()
if libstego.gifshuffle_check_capacity(palette_data, para) >= msglen:
return ["Adv. Gifshuffle", para]
# no elif gifshuffle since it has the same capacity that adv gusfhuffle has
para = libstegofile.frirui_parameter()
para.method = 0;
para.size = 100;
para.password = password
para.pwlen = len(password)
#para.method = 1;
#para.threshold = 574;
#para.password = password
#para.pwlen = len(password)
#para.method = 1;
#para.threshold = 1148;
#para.password = password
#para.pwlen = len(password)
#para.method = 2;
#para.password = password
#para.pwlen = len(password)
#para.method = 1;
#para.threshold = 2295;
#para.password = password
#para.pwlen = len(password)
#para.method = 0;
#para.size = 6;
#para.password = password
#para.pwlen = len(password)
# DONE: multiple parameter sets for frirui from Matthias here!
if libstego.frirui_check_capacity(palette_data, para) >= msglen:
return ["Frirui", para]
para = libstegofile.sortunsort_parameter()
if libstego.sortunsort_check_capacity(palette_data, para) >= msglen:
return ["Sort/Unsort", para]
"""para = libstegofile_lsb_parameter_t()
#TODO: LSB Wrappers for structs like palette_data -> Jan ?
if libstego.lsb_check_capacity(palette_data, para) >= msglen:
return ["LSB", para]"""
elif filename.endswith("png"):
# CPT, Battlesteg, LSB
rgb_data = libstegofile.rgb_data_t()
png_int = libstegofile.png_internal_data_t()
err = libstegofile.io_png_read(filename, rgb_data, png_int)
for i in [2,4,6,8]:
para = libstegofile.cpt_parameter()
para.block_width = i;
para.block_height = i;
para.password = password
para.pwlen = len(password)
if libstegofile.cpt_check_capacity(rgb_data, para) >= msglen:
return ["CPT", para]
para = libstegofile.battlesteg_parameter()
para.startbit = 7
para.move_away = 3
para.range = 5
para.password = password
para.pwlen = len(password)
# parameter set "capacity"
#para = libstegofile.battlesteg_parameter()
#para.startbit = 6
#para.move_away = 3
#para.range = 5
#para.password = "******"
#para.pwlen = 8
if libstegofile.battlesteg_check_capacity(rgb_data, para) >= msglen:
return ["BattleSteg", para]
"""para = libstegofile.lsb_parameter()
para.password = password
para.pwlen = len(password)
para.select_mode = 2
if libstegofile.lsb_check_capacity(rgb_data, para) >= msglen:
return ["LSB", para]"""
elif filename.endswith("wav"):
# Phase Coding, Echo Hiding, LSB
pass
elif filename.endswith("svg"):
# SVGSteg
svg_data = libstegofile.svg_data_t()
svg_int = libstegofile.svg_internal_data_t()
err = libstegofile.io_svg_read(filename, svg_data, svg_int)
if err != 0:
return None
para = libstegofile.svg_parameter_t()
para.password = password
para.pwlen = len(password)
para.first_embed_digit = 3
fits = False
if libstego.svg_check_capacity(svg_dat, para) >= msglen:
fits = True
libstegofile.svg_cleanup_data(svg_dat)
libstegofile.svg_cleanup_internal(svg_int)
if fits == True:
return ["SVG", para]
def get_best_method(filename, filetype, msglen, password):
# setup all methods
setup_methods(password)
# get methods for current file type
num_selected, sel_method = get_methods_for_filetype(filetype)
for i in [0, num_selected-1]:
fits = False
if method_to_algo[i] == "PQ":
# prepare data strucures
jpeg_data = libstegofile.jpeg_data_t()
jpeg_int = libstegofile.jpeg_internal_data_t()
# read file data
err = libstegofile.io_jpeg_read(filename, jpeg_data, jpeg_int)
if err != 0:
# TODO better error handling -> detailed message what went wrong
# by using the 'lstg_errno' code
return None
# check if message fits with the current params
para = methods[i]
if libstego.pq_check_capacity(jpeg_data, para) >= msglen:
fits = True
# cleanup
libstegofile.jpeg_cleanup_data(jpeg_data)
libstegofile.io_jpeg_cleanup_internal(jpg_int)
if method_to_algo[i] == "F5":
# prepare data strucures
jpeg_data = libstegofile.jpeg_data_t()
jpeg_int = libstegofile.jpeg_internal_data_t()
# read file data
err = libstegofile.io_jpeg_read(filename, jpeg_data, jpeg_int)
if err != 0:
# TODO better error handling -> detailed message what went wrong
# by using the 'lstg_errno' code
return None
# check if message fits with the current params
para = methods[i]
if libstego.f5_check_capacity(jpeg_data, para) >= msglen:
fits = True
# cleanup
libstegofile.jpeg_cleanup_data(jpeg_data)
libstegofile.io_jpeg_cleanup_internal(jpg_int)
if method_to_algo[i] in ["Adv. Gifshuffle", "Gifshuffle"]:
# prepare data strucures
palette_data = libstegofile.palette_data_t()
gif_int = libstegofile.gif_internal_data_t()
# read file data
err = libstegofile.io_gif_read(filename, palette_data, gif_int)
if err != 0:
# TODO better error handling -> detailed message what went wrong
# by using the 'lstg_errno' code
return None
# check if message fits with the current params
para = methods[i]
if libstego.gifshuffle_check_capacity(palette_data, para) >= msglen:
fits = True
# cleanup
libstegofile.io_gif_cleanup_data(palette_data)
libstegofile.io_gif_cleanup_internal(gif_int)
if method_to_algo[i] == "Frirui":
# prepare data strucures
palette_data = libstegofile.palette_data_t()
gif_int = libstegofile.gif_internal_data_t()
# read file data
err = libstegofile.io_gif_read(filename, palette_data, gif_int)
if err != 0:
# TODO better error handling -> detailed message what went wrong
# by using the 'lstg_errno' code
return None
# check if message fits with the current params
para = methods[i]
if libstego.frirui_check_capacity(palette_data, para) >= msglen:
fits = True
# cleanup
libstegofile.io_gif_cleanup_data(palette_data)
libstegofile.io_gif_cleanup_internal(gif_int)
if method_to_algo[i] == "Sort/Unsort":
# prepare data strucures
palette_data = libstegofile.palette_data_t()
gif_int = libstegofile.gif_internal_data_t()
# read file data
err = libstegofile.io_gif_read(filename, palette_data, gif_int)
if err != 0:
# TODO better error handling -> detailed message what went wrong
# by using the 'lstg_errno' code
return None
# check if message fits with the current params
para = methods[i]
if libstego.sortunsort_check_capacity(palette_data, para) >= msglen:
fits = True
# cleanup
libstegofile.io_gif_cleanup_data(palette_data)
libstegofile.io_gif_cleanup_internal(gif_int)
if method_to_algo[i] == "CPT":
# prepare data strucures
rgb_data = libstegofile.rgb_data_t()
png_int = libstegofile.png_internal_data_t()
# read file data
err = libstegofile.io_png_read(filename, rgb_data, png_int)
if err != 0:
# TODO better error handling -> detailed message what went wrong
# by using the 'lstg_errno' code
return None
# check if message fits with the current params
para = methods[i]
if libstegofile.cpt_check_capacity(rgb_data, para) >= msglen:
fits = True
# cleanup
libstegofile.io_png_cleanup_data(rgb_data)
libstegofile.io_png_cleanup_internal(png_int)
if method_to_algo[i] == "Battlesteg":
# prepare data strucures
rgb_data = libstegofile.rgb_data_t()
png_int = libstegofile.png_internal_data_t()
# read file data
err = libstegofile.io_png_read(filename, rgb_data, png_int)
if err != 0:
# TODO better error handling -> detailed message what went wrong
# by using the 'lstg_errno' code
return None
# check if message fits with the current params
para = methods[i]
if libstegofile.battlesteg_check_capacity(rgb_data, para) >= msglen:
fits = True
# cleanup
libstegofile.io_png_cleanup_data(rgb_data)
libstegofile.io_png_cleanup_internal(png_int)
if method_to_algo[i] == "SVG Steg":
# prepare data strucures
svg_data = libstegofile.svg_data_t()
svg_int = libstegofile.svg_internal_data_t()
# read file data
err = libstegofile.io_svg_read(filename, svg_data, svg_int)
if err != 0:
# TODO better error handling -> detailed message what went wrong
# by using the 'lstg_errno' code
return None
# check if message fits with the current params
para = methods[i]
if libstego.svg_check_capacity(svg_data, para) >= msglen:
fits = True
# cleanup
libstegofile.svg_cleanup_data(svg_data)
libstegofile.svg_cleanup_internal(svg_int)
if method_to_algo[i] == "Echo Hiding":
# TODO implement
pass
if method_to_algo[i] == "Phase Coding":
# TODO implement
pass
if method_to_algo[i] == "LSB":
# TODO implement
pass
if fits:
return i
return None