def main():
secret = trapdoor.loadtrapdoor()
if len(sys.argv) < 5 or (sys.argv[-2] not in ("-out", "--out")):
print("usage: python3 encrypt.py <realtext>",
"<faketext0> [<faketext1> ...] -out <outfile>")
return
faketextfns = sys.argv[2:-2]
realtextfn = sys.argv[1]
outfn = sys.argv[-1]
print("plaintext:", realtextfn)
print("decoy texts:", faketextfns)
print("encrypted output:", outfn)
inbits = streamofbits.bits(realtextfn, infinitepad=True)
fakestreams = [streamofbits.bits(fn, infinitepad=True)
for fn in faketextfns]
realkey = []
fakekeys = []
for fn in faketextfns:
fakekeys.append([])
totalbits = 8 * streamofbits.maxfilesize([realtextfn] + faketextfns)
with open(outfn, "wb") as outfile:
for bitnum in range(totalbits):
inbit = next(inbits)
enc = encode(inbit, secret)
asbytes = streamofbits.bits_to_bytes(enc)
outfile.write(bytes(asbytes))
realkey.append(enc[0] ^ inbit)
for fakestream,fakekey in zip(fakestreams,fakekeys):
fakebit = next(fakestream)
fakekey.append(enc[0] ^ fakebit)
with open("realkey", "wb") as outfile:
asbytes = streamofbits.bits_to_bytes(realkey)
outfile.write(bytes(asbytes))
for i,fakekey in enumerate(fakekeys):
with open("fakekey{0}".format(i), "wb") as outfile:
asbytes = streamofbits.bits_to_bytes(fakekey)
outfile.write(bytes(asbytes))
def main():
secret = trapdoor.loadtrapdoor()
if len(sys.argv) != 2:
print("usage: python3 decrypt.py <infile>")
return
inbits = streamofbits.bits(sys.argv[1])
cipherbits = list(inbits)
plainbits = []
for encoded in streamofbits.n_at_a_time(cipherbits,
constants.ELEMENT_LENGTH *
constants.ELEMENTS_PER_BIT):
numS = countSs(encoded, secret)
plainbits.append(numS % 2)
print(bytes.decode(bytes(streamofbits.bits_to_bytes(plainbits))), end="")
def main():
if len(sys.argv) != 3:
print("usage: python3 decryptwithkey.py <infile> <keyfile>")
return
inbits = streamofbits.bits(sys.argv[1])
inkeybits = streamofbits.bits(sys.argv[2])
cipherbits = list(inbits)
keybits = list(inkeybits)
plainbits = []
encodinglength = constants.ELEMENT_LENGTH * constants.ELEMENTS_PER_BIT
encodeds = streamofbits.n_at_a_time(cipherbits, encodinglength)
for encoded,keybit in zip(encodeds, keybits):
nextbit = encoded[0] ^ keybit
plainbits.append(nextbit)
print(bytes.decode(bytes(streamofbits.bits_to_bytes(plainbits))), end="")
