def test_PrepMsg(self):
msg1 = np.array([34, 20, 5, 42, 26, 9, 3, 5, 60, 6, 24, 22])
msg2 = np.array([34, 16, 49, 31, 2, 9, 16, 22, 41, 38, 24, 22])
expectedresult1 = np.array(
[39, 19, 16, 44, 29, 13, 58, 19, 13, 14, 20, 44, 17, 20, 25, 31, 46, 2, 29, 35, 56, 17, 11, 20, 39,
51, 7, 30, 26, 11, 17, 27, 21, 11, 30, 34, 46, 48, 15, 53, 14, 26, 12, 7, 5, 8, 42, 41, 37, 19,
16, 35, 63, 20, 3, 12, 38, 26, 8, 37, 22, 23, 29])
expectedresult2 = np.array(
[1, 22, 21, 42, 33, 8, 40, 58, 13, 54, 19, 19, 58, 6, 5, 10, 29, 24, 34, 1, 53, 33, 30, 43, 17,
51, 29, 38, 52, 58, 55, 9, 49, 50, 24, 61, 0, 52, 51, 20, 25, 58, 15, 41, 53, 48, 6, 57, 10, 25,
11, 30, 16, 20, 47, 6, 0, 43, 6, 18, 38, 3, 29])
result1 = jt.prepmsg(msg1)
result2 = jt.prepmsg(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 jt65encodemessages(jt65msgs, verbose=False):
# Encode valid text into array of JT65 data
jt65data = []
for index, value in enumerate(jt65msgs):
legitjt = jt.encode(value)
legitpacket = jt.prepmsg(legitjt)
if verbose:
print "JT65 legit message " + str(index) + " : " + value
print "Encoded as : " + str(legitjt)
print "Legit channel symbols with RS :" + str(legitpacket)
jt65data.append(legitpacket)
return jt65data
def getgoodconfidence(packets, verbose=False):
# takes in a list of packets
# returns a list of all the confidence values for correct symbols
confidences = []
for packet in packets:
symbols = packet[0]
confidence = packet[1]
symboltrydecode = copy.deepcopy(symbols)
testdecode = jt65wrapy.unprepmsg(symboltrydecode)
realmessage = jt65wrapy.prepmsg(testdecode)
symbolmap = map(eq, realmessage, symbols)
for i in range(0, 63):
if symbolmap[i]:
confidences.append(confidence[i])
return confidences
def getgoodconfidence(packets, verbose=False):
# takes in a list of packets
# returns a list of all the confidence values for correct symbols
confidences = []
for packet in packets:
symbols = packet[0]
confidence = packet[1]
symboltrydecode = copy.deepcopy(symbols)
testdecode = jt65wrapy.unprepmsg(symboltrydecode)
realmessage = jt65wrapy.prepmsg(testdecode)
symbolmap = map(eq, realmessage, symbols)
for i in range(0, 63):
if symbolmap[i]:
confidences.append(confidence[i])
return confidences
def validatesteg(jt65msg, rxsymbols, hidekey, errordetectionthreshold, verbose=False):
# Determines if a given set of symbols contain steganography or are a
# normal JT65 message
errorcount = 0
# Determine what the symbols would be if there were no errors
truesymbols = jt.prepmsg(jt.encode(jt65msg))
# Determine how many symbols where steg should be hidden contain errors
for i in hidekey:
if rxsymbols[i] != truesymbols[i]:
errorcount += 1
if errorcount >= errordetectionthreshold:
return True
return False
def checkpacket(packet, verbose=False):
# packet is a two dimensional array of symbols and confidence
# returns diffs list of [diff position, packet symbol, clean encode symbol, confidence]
# if verbose prints <number of diffs>,<average confidence of diffs> to stdout
symbols = packet[0]
confidence = packet[1]
symboltrydecode = copy.deepcopy(symbols)
testdecode = jt65wrapy.unprepmsg(symboltrydecode)
realmessage = jt65wrapy.prepmsg(testdecode)
symbolmap = map(eq, realmessage, symbols)
diffs = []
for i in range(0, 63):
if not symbolmap[i]:
diffs.append([i, symbols[i], realmessage[i], confidence[i]])
if verbose:
print diffs
print realmessage
print symbols
return diffs
def checkpacket(packet, verbose=False):
# packet is a two dimensional array of symbols and confidence
# returns diffs list of [diff position, packet symbol, clean encode symbol, confidence]
# if verbose prints <number of diffs>,<average confidence of diffs> to stdout
symbols = packet[0]
confidence = packet[1]
symboltrydecode = copy.deepcopy(symbols)
testdecode = jt65wrapy.unprepmsg(symboltrydecode)
realmessage = jt65wrapy.prepmsg(testdecode)
symbolmap = map(eq, realmessage, symbols)
diffs = []
for i in range(0, 63):
if not symbolmap[i]:
diffs.append([i, symbols[i], realmessage[i], confidence[i]])
if verbose:
print diffs
print realmessage
print symbols
return diffs