def test_9(self):
"""test_9 AES-GCM: Failed encryption and decryption by changing a header byte"""
# Generate 16 byte key
key = os.urandom(mpin.PAS)
# Generate 12 byte IV
iv = os.urandom(mpin.IVL)
# Generate a 32 byte random header
header = os.urandom(32)
# Plaintext input
plaintext1 = "A test message"
ciphertext, tag1 = mpin.aes_gcm_encrypt(key, iv, header, plaintext1)
new = list(header)
new[0] = "a"
header_bad = ''.join(new)
plaintext2, tag2 = mpin.aes_gcm_decrypt(key, iv, header_bad,
ciphertext)
self.assertNotEqual(tag1, tag2)
self.assertEqual(plaintext1, plaintext2)
def test_7(self):
"""test_7 AES-GCM: Successful encryption and decryption"""
# Generate 16 byte key
key = os.urandom(mpin.PAS)
# Generate 12 byte IV
iv = os.urandom(mpin.IVL)
# Generate a 32 byte random header
header = os.urandom(32)
# Plaintext input
plaintext1 = "A test message"
ciphertext, tag1 = mpin.aes_gcm_encrypt(key, iv, header, plaintext1)
plaintext2, tag2 = mpin.aes_gcm_decrypt(key, iv, header, ciphertext)
self.assertEqual(tag1, tag2)
self.assertEqual(plaintext1, plaintext2)
nIter)
rtn, server_aes_key = mpin.server_key(HASH_TYPE_MPIN, Z,
server_secret, w, HM, HID, u,
ut)
if rtn != 0:
print "ERROR: Generating server_aes_key %s" % rtn
print "Server AES Key: %s" % server_aes_key.encode("hex")
if MPIN_FULL:
plaintext = "A test message"
print "message to encrypt: ", plaintext
header_hex = "1554a69ecbf04e507eb6985a234613246206c85f8af73e61ab6e2382a26f457d"
header = header_hex.decode("hex")
iv_hex = "2b213af6b0edf6972bf996fb"
iv = iv_hex.decode("hex")
time_func(
'ciphertext, tag = mpin.aes_gcm_encrypt(client_aes_key, iv, header, plaintext)',
nIter)
ciphertext, tag = mpin.aes_gcm_encrypt(client_aes_key, iv, header,
plaintext)
print "ciphertext ", ciphertext.encode("hex")
print "tag1 ", tag.encode("hex")
time_func(
'plaintext2, tag2 = mpin.aes_gcm_decrypt(server_aes_key, iv, header, ciphertext)',
nIter)
plaintext2, tag2 = mpin.aes_gcm_decrypt(server_aes_key, iv, header,
ciphertext)
print "decrypted message: ", plaintext2
print "tag2 ", tag2.encode("hex")