def testCmacComputation(self):
key = bytearray([
0x12, 0x34, 0x56, 0x78, 0x12, 0x34, 0x56, 0x78, 0x12, 0x34, 0x56,
0x78, 0x12, 0x34, 0x56, 0x78
])
cmac = XTEA_CMAC(key)
cmac.update(x2a('de ad be ef'))
result = cmac.final()
expectedResult = bytearray(x2a('b5 f3 eb 27 15 45 e5 55'))
self.assertEqual(result, expectedResult)
def main():
parser = argparse.ArgumentParser(
description='Decrypt dumps collected earlier')
parser.add_argument('trackerId')
args = parser.parse_args()
dumpDir = '~/.galileo'
db = LocalDatabase(dumpDir)
trackerId = args.trackerId
trackerDumpDir = db.getDeviceDirectoryName(trackerId)
key = db.loadKey(trackerId)
files = os.listdir(trackerDumpDir)
files = [x for x in files if not 'dec' in x]
for filename in files:
dumpname = os.path.join(trackerDumpDir, filename)
file = open(dumpname)
data = file.read()
pieces = data.split('\n\n')
responsePresent = len(pieces) == 2
if responsePresent:
[megadumpData, megadumpResponseData] = pieces
else:
[megadumpData] = pieces
megadump = Dump(MEGADUMP)
megadump.data = bytearray(x2a(megadumpData))
megadump.megadump()
try:
decrypt(megadump, key)
except UnknownDumpTypeError:
print('Encountered an UnknownDumpTypeError in the dump of file: ' +
filename)
megadump.toFile(dumpname.replace('.txt', '_dec.txt'))
if responsePresent:
CHUNK_LEN = 20
megadumpResponse = DumpResponse(x2a(megadumpResponseData),
CHUNK_LEN)
megadumpResponse.megadump()
try:
decrypt(megadumpResponse, key, offset=10)
except UnknownDumpTypeError:
print(
'Encountered an UnknownDumpTypeError in the responsedump of file: '
+ filename)
megadumpResponse.toFile(dumpname.replace('.txt', '_resp_dec.txt'))
def testParseProtocolHeader(self):
block = TrackerBlock()
block.data = bytearray(x2a('2E 02 00 00 01 00 D0 00 00 00'))
self.assertEqual(block.megadumpType, '2E')
self.assertEqual(block.encryption, 1)
self.assertEqual(block.nonce, bytearray([0xD0, 0x00, 0x00, 0x00]))
def testDumpProperties(self):
dump = Dump(13)
dump.data = bytearray(
x2a('2E 02 00 00 01 00 D0 00 00 00 AB CD EF 12 34 56'))
self.assertEqual(dump.serial, 'ABCDEF123456')
self.assertEqual(dump.trackerType, 86)
def testComputeCounter(self):
key = bytearray([
0x12, 0x34, 0x56, 0x78, 0x12, 0x34, 0x56, 0x78, 0x12, 0x34, 0x56,
0x78, 0x12, 0x34, 0x56, 0x78
])
nonce = bytearray([0xDE, 0xAD, 0xBE, 0xEF])
counter = computeCounter(key, nonce)
self.assertEqual(counter, bytearray(x2a('a9 3f 69 fc 60 eb 75 25')))
def testMultipleLines(self):
self.assertEqual(x2a('00\n01\n02\n03'), [0, 1, 2, 3])
self.assertEqual(x2a('00 01\n02 03'), [0, 1, 2, 3])
def testSimple(self):
self.assertEqual(x2a('2'), [2])
self.assertEqual(x2a('02'), [2])
self.assertEqual(x2a('2 3'), [2, 3])
def testDecrypt(self):
z = xtea_decrypt(bytearray('0123456789012345', 'utf-8'),
bytearray(x2a('B6 7C 01 66 2F F6 96 4A')))
self.assertEqual(a2s(z), 'ABCDEFGH')
def testSimple(self):
self.assertEqual(x2a('2'), [2])
self.assertEqual(x2a('02'), [2])
self.assertEqual(x2a('2 3'), [2, 3])