def test_PrepSteg(self):
msg1 = np.array([16, 52, 50, 11, 6, 13, 41, 26, 39, 15, 39, 11])
msg2 = np.array([20, 36, 39, 11, 59, 23, 28, 16, 53, 8, 57, 0])
expectedresult1 = np.array(
[47, 44, 14, 33, 4, 58, 19, 6, 16, 52, 50, 11, 6, 13, 41, 26, 39, 15, 39, 11])
expectedresult2 = np.array(
[22, 29, 9, 53, 17, 23, 57, 14, 20, 36, 39, 11, 59, 23, 28, 16, 53, 8, 57, 0])
result1 = jt.prepsteg(msg1)
result2 = jt.prepsteg(msg2)
self.assertEqual(len(result1), len(expectedresult1))
self.assertEqual(len(result2), len(expectedresult2))
self.assertEqual(result1.tolist(), expectedresult1.tolist())
self.assertEqual(result2.tolist(), expectedresult2.tolist())
def createciphermsgs_packer_other(totalpackets, ciphermsgs, cipherlist, verbose=False):
# Packs hidden message into JT65 symbols with all the other available ciphers
for index in range(totalpackets):
status = 0
if index == 0:
# First packet sets first bit to one, then remaining bits show
# total number of packets
status = 0x80 | totalpackets
else:
# All remaining packets send packet number, zero indexed
status = index
thissteg = bytes8tojt65(cipherlist[index * 8:(index * 8) + 8], status)
secretjtfec = jt.prepsteg(thissteg)
if verbose:
print "Status: " + str(status)
print "JT65 Encoded Cipher Data Msg " + str(index) + " : " + str(thissteg)
print "JT65 Encoded Cipher Data Msg with FEC " + str(index) + " : " + str(secretjtfec)
ciphermsgs.append(secretjtfec)
def createciphermsgs_none(jt65msgcount, stegmsg, verbose=False):
# Packs hidden message into JT65 symbols with no cipher
ciphermsgs = []
# Can we fit your hidden message?
if jt65msgcount * 13 < len(stegmsg):
print(
"Length of hidden message exceeds capacity of number of valid JT65 messages provided")
sys.exit(0)
for index in range(jt65msgcount):
secretjt = jt.encode(stegmsg[index * 13:index * 13 + 13])
secretjtfec = jt.prepsteg(secretjt)
if verbose:
print "Secret message " + str(index) + " : " + stegmsg[index * 13:index * 13 + 13]
print "Secret message " + str(index) + " encoded : " + str(secretjt)
print "Secret message " + str(index) + " encoded with FEC : " + str(secretjtfec)
ciphermsgs.append(secretjtfec)
return ciphermsgs
def createciphermsgs_packer_xor(totalpackets, originallength, ciphermsgs, cipherlist, verbose=False):
# Packs hidden message into JT65 symbols with XOR cipher
for index in range(totalpackets):
# Determine how many bytes are in this message
if originallength >= 8:
thislength = 8
else:
thislength = originallength % 8
originallength -= 8
status = 0
if index == 0:
# First packet sets first bit to one, then remaining bits show
# total number of packets
status = 0x80 | totalpackets
elif index == totalpackets - 1:
# Last packet sets second bit to one, then remaining bites show how
# many bytes to read out of this packet
status = status | 0x40 | thislength
else:
# All remaining packets send packet number, zero indexed
status = index
if index == 0 and index == totalpackets - 1:
# Handle the case where the total size is only one packet long
status = 0x80 | 0x40 | thislength
thissteg = bytes8tojt65(cipherlist[index * 8:(index * 8) + 8], status)
secretjtfec = jt.prepsteg(thissteg)
if verbose:
print "Status: " + str(status) + " thislength : " + str(thislength)
print "JT65 Encoded Cipher Data Msg " + str(index) + " : " + str(thissteg)
print "JT65 Encoded Cipher Data Msg with FEC " + str(index) + " : " + str(secretjtfec)
ciphermsgs.append(secretjtfec)
