def generate_key(key_material, sid_value):
sid_value_nob64 = base64.b64decode(sid_value)
# part of the decoded SID value contains a random 16-byte value needed to decrypt the response
rand_16_bytes = sid_value_nob64[0:16]
blake = monocypher.Blake2b(key=rand_16_bytes)
blake.update(key_material)
hash1 = blake.finalize()
blake = monocypher.Blake2b(key=hash1)
blake.update(key_material)
hash2 = blake.finalize()
slice1 = hash2[0:32]
slice2 = hash2[32:]
key = []
for i, b1 in enumerate(slice1):
kb = b1 ^ slice2[i]
key.append(kb)
key = bytes(key)
return key
def generate_JSESSIONID(key):
blake = monocypher.Blake2b()
blake.update(key)
hash1 = blake.finalize()
slice1 = hash1[0:16]
slice2 = hash1[16:32]
buf = []
for i, b1 in enumerate(slice1):
kb = b1 ^ slice2[i]
buf.append(kb)
buf = bytes(buf)
JSESSIONID = base64.b64encode(buf)
print("JSESSIONID: %s" % JSESSIONID)
def test_blake2b_against_test_vectors(self):
with open(BLAKE2_TEST_VECTOR_FILENAME, 'rt') as f:
test_vectors = json.load(f)
for test_vector in test_vectors:
if test_vector['hash'] != 'blake2b':
continue
if test_vector['key'] != '': # todo remove
continue
v_in = binascii.unhexlify(test_vector['in'])
v_key = binascii.unhexlify(test_vector['key'])
v_out = binascii.unhexlify(test_vector['out'])
result = monocypher.blake2b(v_in, v_key)
self.assertEqual(v_out, result)
b = monocypher.Blake2b(key=v_key)
b.update(v_in)
self.assertEqual(v_out, b.finalize())
result = hashlib.blake2b(v_in).digest()
self.assertEqual(v_out, result)