# ===================================================================
#
# Copyright (c) 2015, Legrandin <helderijs@gmail.com>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in
# the documentation and/or other materials provided with the
# distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
# ===================================================================
from __future__ import print_function
import unittest
from binascii import unhexlify
from Crypto.SelfTest.st_common import list_test_cases
from Crypto.SelfTest.loader import load_test_vectors, load_test_vectors_wycheproof
from Crypto.Util.py3compat import tobytes, bchr
from Crypto.Cipher import AES
from Crypto.Hash import SHAKE128, SHA256
from Crypto.Util.strxor import strxor
def get_tag_random(tag, length):
return SHAKE128.new(data=tobytes(tag)).read(length)
class GcmTests(unittest.TestCase):
key_128 = get_tag_random("key_128", 16)
nonce_96 = get_tag_random("nonce_128", 12)
data = get_tag_random("data", 128)
def test_loopback_128(self):
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
pt = get_tag_random("plaintext", 16 * 100)
ct = cipher.encrypt(pt)
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
pt2 = cipher.decrypt(ct)
self.assertEqual(pt, pt2)
def test_nonce(self):
# Nonce is optional (a random one will be created)
AES.new(self.key_128, AES.MODE_GCM)
cipher = AES.new(self.key_128, AES.MODE_GCM, self.nonce_96)
ct = cipher.encrypt(self.data)
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
self.assertEqual(ct, cipher.encrypt(self.data))
def test_nonce_must_be_bytes(self):
self.assertRaises(TypeError, AES.new, self.key_128, AES.MODE_GCM,
nonce=u'test12345678')
def test_nonce_length(self):
# nonce can be of any length (but not empty)
self.assertRaises(ValueError, AES.new, self.key_128, AES.MODE_GCM,
nonce=b"")
for x in range(1, 128):
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=bchr(1) * x)
cipher.encrypt(bchr(1))
def test_block_size_128(self):
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
self.assertEqual(cipher.block_size, AES.block_size)
def test_nonce_attribute(self):
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
self.assertEqual(cipher.nonce, self.nonce_96)
# By default, a 15 bytes long nonce is randomly generated
nonce1 = AES.new(self.key_128, AES.MODE_GCM).nonce
nonce2 = AES.new(self.key_128, AES.MODE_GCM).nonce
self.assertEqual(len(nonce1), 16)
self.assertNotEqual(nonce1, nonce2)
def test_unknown_parameters(self):
self.assertRaises(TypeError, AES.new, self.key_128, AES.MODE_GCM,
self.nonce_96, 7)
self.assertRaises(TypeError, AES.new, self.key_128, AES.MODE_GCM,
nonce=self.nonce_96, unknown=7)
# But some are only known by the base cipher
# (e.g. use_aesni consumed by the AES module)
AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96,
use_aesni=False)
def test_null_encryption_decryption(self):
for func in "encrypt", "decrypt":
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
result = getattr(cipher, func)(b"")
self.assertEqual(result, b"")
def test_either_encrypt_or_decrypt(self):
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
cipher.encrypt(b"")
self.assertRaises(TypeError, cipher.decrypt, b"")
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
cipher.decrypt(b"")
self.assertRaises(TypeError, cipher.encrypt, b"")
def test_data_must_be_bytes(self):
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
self.assertRaises(TypeError, cipher.encrypt, u'test1234567890-*')
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
self.assertRaises(TypeError, cipher.decrypt, u'test1234567890-*')
def test_mac_len(self):
# Invalid MAC length
self.assertRaises(ValueError, AES.new, self.key_128, AES.MODE_GCM,
nonce=self.nonce_96, mac_len=3)
self.assertRaises(ValueError, AES.new, self.key_128, AES.MODE_GCM,
nonce=self.nonce_96, mac_len=16+1)
# Valid MAC length
for mac_len in range(5, 16 + 1):
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96,
mac_len=mac_len)
_, mac = cipher.encrypt_and_digest(self.data)
self.assertEqual(len(mac), mac_len)
# Default MAC length
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
_, mac = cipher.encrypt_and_digest(self.data)
self.assertEqual(len(mac), 16)
def test_invalid_mac(self):
from Crypto.Util.strxor import strxor_c
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
ct, mac = cipher.encrypt_and_digest(self.data)
invalid_mac = strxor_c(mac, 0x01)
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
self.assertRaises(ValueError, cipher.decrypt_and_verify, ct,
invalid_mac)
def test_hex_mac(self):
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
mac_hex = cipher.hexdigest()
self.assertEqual(cipher.digest(), unhexlify(mac_hex))
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
cipher.hexverify(mac_hex)
def test_message_chunks(self):
# Validate that both associated data and plaintext/ciphertext
# can be broken up in chunks of arbitrary length
auth_data = get_tag_random("authenticated data", 127)
plaintext = get_tag_random("plaintext", 127)
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
cipher.update(auth_data)
ciphertext, ref_mac = cipher.encrypt_and_digest(plaintext)
def break_up(data, chunk_length):
return [data[i:i+chunk_length] for i in range(0, len(data),
chunk_length)]
# Encryption
for chunk_length in 1, 2, 3, 7, 10, 13, 16, 40, 80, 128:
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
for chunk in break_up(auth_data, chunk_length):
cipher.update(chunk)
pt2 = b""
for chunk in break_up(ciphertext, chunk_length):
pt2 += cipher.decrypt(chunk)
self.assertEqual(plaintext, pt2)
cipher.verify(ref_mac)
# Decryption
for chunk_length in 1, 2, 3, 7, 10, 13, 16, 40, 80, 128:
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
for chunk in break_up(auth_data, chunk_length):
cipher.update(chunk)
ct2 = b""
for chunk in break_up(plaintext, chunk_length):
ct2 += cipher.encrypt(chunk)
self.assertEqual(ciphertext, ct2)
self.assertEqual(cipher.digest(), ref_mac)
def test_bytearray(self):
# Encrypt
key_ba = bytearray(self.key_128)
nonce_ba = bytearray(self.nonce_96)
header_ba = bytearray(self.data)
data_ba = bytearray(self.data)
cipher1 = AES.new(self.key_128,
AES.MODE_GCM,
nonce=self.nonce_96)
cipher1.update(self.data)
ct = cipher1.encrypt(self.data)
tag = cipher1.digest()
cipher2 = AES.new(key_ba,
AES.MODE_GCM,
nonce=nonce_ba)
key_ba[:3] = b"\xFF\xFF\xFF"
nonce_ba[:3] = b"\xFF\xFF\xFF"
cipher2.update(header_ba)
header_ba[:3] = b"\xFF\xFF\xFF"
ct_test = cipher2.encrypt(data_ba)
data_ba[:3] = b"\xFF\xFF\xFF"
tag_test = cipher2.digest()
self.assertEqual(ct, ct_test)
self.assertEqual(tag, tag_test)
self.assertEqual(cipher1.nonce, cipher2.nonce)
# Decrypt
key_ba = bytearray(self.key_128)
nonce_ba = bytearray(self.nonce_96)
header_ba = bytearray(self.data)
del data_ba
cipher4 = AES.new(key_ba,
AES.MODE_GCM,
nonce=nonce_ba)
key_ba[:3] = b"\xFF\xFF\xFF"
nonce_ba[:3] = b"\xFF\xFF\xFF"
cipher4.update(header_ba)
header_ba[:3] = b"\xFF\xFF\xFF"
pt_test = cipher4.decrypt_and_verify(bytearray(ct_test), bytearray(tag_test))
self.assertEqual(self.data, pt_test)
def test_memoryview(self):
# Encrypt
key_mv = memoryview(bytearray(self.key_128))
nonce_mv = memoryview(bytearray(self.nonce_96))
header_mv = memoryview(bytearray(self.data))
data_mv = memoryview(bytearray(self.data))
cipher1 = AES.new(self.key_128,
AES.MODE_GCM,
nonce=self.nonce_96)
cipher1.update(self.data)
ct = cipher1.encrypt(self.data)
tag = cipher1.digest()
cipher2 = AES.new(key_mv,
AES.MODE_GCM,
nonce=nonce_mv)
key_mv[:3] = b"\xFF\xFF\xFF"
nonce_mv[:3] = b"\xFF\xFF\xFF"
cipher2.update(header_mv)
header_mv[:3] = b"\xFF\xFF\xFF"
ct_test = cipher2.encrypt(data_mv)
data_mv[:3] = b"\xFF\xFF\xFF"
tag_test = cipher2.digest()
self.assertEqual(ct, ct_test)
self.assertEqual(tag, tag_test)
self.assertEqual(cipher1.nonce, cipher2.nonce)
# Decrypt
key_mv = memoryview(bytearray(self.key_128))
nonce_mv = memoryview(bytearray(self.nonce_96))
header_mv = memoryview(bytearray(self.data))
del data_mv
cipher4 = AES.new(key_mv,
AES.MODE_GCM,
nonce=nonce_mv)
key_mv[:3] = b"\xFF\xFF\xFF"
nonce_mv[:3] = b"\xFF\xFF\xFF"
cipher4.update(header_mv)
header_mv[:3] = b"\xFF\xFF\xFF"
pt_test = cipher4.decrypt_and_verify(memoryview(ct_test), memoryview(tag_test))
self.assertEqual(self.data, pt_test)
def test_output_param(self):
pt = b'5' * 128
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
ct = cipher.encrypt(pt)
tag = cipher.digest()
output = bytearray(128)
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
res = cipher.encrypt(pt, output=output)
self.assertEqual(ct, output)
self.assertEqual(res, None)
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
res = cipher.decrypt(ct, output=output)
self.assertEqual(pt, output)
self.assertEqual(res, None)
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
res, tag_out = cipher.encrypt_and_digest(pt, output=output)
self.assertEqual(ct, output)
self.assertEqual(res, None)
self.assertEqual(tag, tag_out)
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
res = cipher.decrypt_and_verify(ct, tag, output=output)
self.assertEqual(pt, output)
self.assertEqual(res, None)
def test_output_param_memoryview(self):
pt = b'5' * 128
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
ct = cipher.encrypt(pt)
output = memoryview(bytearray(128))
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
cipher.encrypt(pt, output=output)
self.assertEqual(ct, output)
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
cipher.decrypt(ct, output=output)
self.assertEqual(pt, output)
def test_output_param_neg(self):
LEN_PT = 128
pt = b'5' * LEN_PT
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
ct = cipher.encrypt(pt)
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
self.assertRaises(TypeError, cipher.encrypt, pt, output=b'0' * LEN_PT)
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
self.assertRaises(TypeError, cipher.decrypt, ct, output=b'0' * LEN_PT)
shorter_output = bytearray(LEN_PT - 1)
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
self.assertRaises(ValueError, cipher.encrypt, pt, output=shorter_output)
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
self.assertRaises(ValueError, cipher.decrypt, ct, output=shorter_output)
class GcmFSMTests(unittest.TestCase):
key_128 = get_tag_random("key_128", 16)
nonce_96 = get_tag_random("nonce_128", 12)
data = get_tag_random("data", 128)
def test_valid_init_encrypt_decrypt_digest_verify(self):
# No authenticated data, fixed plaintext
# Verify path INIT->ENCRYPT->DIGEST
cipher = AES.new(self.key_128, AES.MODE_GCM,
nonce=self.nonce_96)
ct = cipher.encrypt(self.data)
mac = cipher.digest()
# Verify path INIT->DECRYPT->VERIFY
cipher = AES.new(self.key_128, AES.MODE_GCM,
nonce=self.nonce_96)
cipher.decrypt(ct)
cipher.verify(mac)
def test_valid_init_update_digest_verify(self):
# No plaintext, fixed authenticated data
# Verify path INIT->UPDATE->DIGEST
cipher = AES.new(self.key_128, AES.MODE_GCM,
nonce=self.nonce_96)
cipher.update(self.data)
mac = cipher.digest()
# Verify path INIT->UPDATE->VERIFY
cipher = AES.new(self.key_128, AES.MODE_GCM,
nonce=self.nonce_96)
cipher.update(self.data)
cipher.verify(mac)
def test_valid_full_path(self):
# Fixed authenticated data, fixed plaintext
# Verify path INIT->UPDATE->ENCRYPT->DIGEST
cipher = AES.new(self.key_128, AES.MODE_GCM,
nonce=self.nonce_96)
cipher.update(self.data)
ct = cipher.encrypt(self.data)
mac = cipher.digest()
# Verify path INIT->UPDATE->DECRYPT->VERIFY
cipher = AES.new(self.key_128, AES.MODE_GCM,
nonce=self.nonce_96)
cipher.update(self.data)
cipher.decrypt(ct)
cipher.verify(mac)
def test_valid_init_digest(self):
# Verify path INIT->DIGEST
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
cipher.digest()
def test_valid_init_verify(self):
# Verify path INIT->VERIFY
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
mac = cipher.digest()
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
cipher.verify(mac)
def test_valid_multiple_encrypt_or_decrypt(self):
for method_name in "encrypt", "decrypt":
for auth_data in (None, b"333", self.data,
self.data + b"3"):
if auth_data is None:
assoc_len = None
else:
assoc_len = len(auth_data)
cipher = AES.new(self.key_128, AES.MODE_GCM,
nonce=self.nonce_96)
if auth_data is not None:
cipher.update(auth_data)
method = getattr(cipher, method_name)
method(self.data)
method(self.data)
method(self.data)
method(self.data)
def test_valid_multiple_digest_or_verify(self):
# Multiple calls to digest
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
cipher.update(self.data)
first_mac = cipher.digest()
for x in range(4):
self.assertEqual(first_mac, cipher.digest())
# Multiple calls to verify
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
cipher.update(self.data)
for x in range(5):
cipher.verify(first_mac)
def test_valid_encrypt_and_digest_decrypt_and_verify(self):
# encrypt_and_digest
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
cipher.update(self.data)
ct, mac = cipher.encrypt_and_digest(self.data)
# decrypt_and_verify
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
cipher.update(self.data)
pt = cipher.decrypt_and_verify(ct, mac)
self.assertEqual(self.data, pt)
def test_invalid_mixing_encrypt_decrypt(self):
# Once per method, with or without assoc. data
for method1_name, method2_name in (("encrypt", "decrypt"),
("decrypt", "encrypt")):
for assoc_data_present in (True, False):
cipher = AES.new(self.key_128, AES.MODE_GCM,
nonce=self.nonce_96)
if assoc_data_present:
cipher.update(self.data)
getattr(cipher, method1_name)(self.data)
self.assertRaises(TypeError, getattr(cipher, method2_name),
self.data)
def test_invalid_encrypt_or_update_after_digest(self):
for method_name in "encrypt", "update":
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
cipher.encrypt(self.data)
cipher.digest()
self.assertRaises(TypeError, getattr(cipher, method_name),
self.data)
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
cipher.encrypt_and_digest(self.data)
def test_invalid_decrypt_or_update_after_verify(self):
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
ct = cipher.encrypt(self.data)
mac = cipher.digest()
for method_name in "decrypt", "update":
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
cipher.decrypt(ct)
cipher.verify(mac)
self.assertRaises(TypeError, getattr(cipher, method_name),
self.data)
cipher = AES.new(self.key_128, AES.MODE_GCM, nonce=self.nonce_96)
cipher.decrypt_and_verify(ct, mac)
self.assertRaises(TypeError, getattr(cipher, method_name),
self.data)
class TestVectors(unittest.TestCase):
"""Class exercising the GCM test vectors found in
http://csrc.nist.gov/groups/ST/toolkit/BCM/documents/proposedmodes/gcm/gcm-revised-spec.pdf"""
# List of test vectors, each made up of:
# - authenticated data
# - plaintext
# - ciphertext
# - MAC
# - AES key
# - nonce
test_vectors_hex = [
(
'',
'',
'',
'58e2fccefa7e3061367f1d57a4e7455a',
'00000000000000000000000000000000',
'000000000000000000000000'
),
(
'',
'00000000000000000000000000000000',
'0388dace60b6a392f328c2b971b2fe78',
'ab6e47d42cec13bdf53a67b21257bddf',
'00000000000000000000000000000000',
'000000000000000000000000'
),
(
'',
'd9313225f88406e5a55909c5aff5269a86a7a9531534f7da2e4c303d8a318a72' +
'1c3c0c95956809532fcf0e2449a6b525b16aedf5aa0de657ba637b391aafd255',
'42831ec2217774244b7221b784d0d49ce3aa212f2c02a4e035c17e2329aca12e' +
'21d514b25466931c7d8f6a5aac84aa051ba30b396a0aac973d58e091473f5985',
'4d5c2af327cd64a62cf35abd2ba6fab4',
'feffe9928665731c6d6a8f9467308308',
'cafebabefacedbaddecaf888'
),
(
'feedfacedeadbeeffeedfacedeadbeefabaddad2',
'd9313225f88406e5a55909c5aff5269a86a7a9531534f7da2e4c303d8a318a72' +
'1c3c0c95956809532fcf0e2449a6b525b16aedf5aa0de657ba637b39',
'42831ec2217774244b7221b784d0d49ce3aa212f2c02a4e035c17e2329aca12e' +
'21d514b25466931c7d8f6a5aac84aa051ba30b396a0aac973d58e091',
'5bc94fbc3221a5db94fae95ae7121a47',
'feffe9928665731c6d6a8f9467308308',
'cafebabefacedbaddecaf888'
),
(
'feedfacedeadbeeffeedfacedeadbeefabaddad2',
'd9313225f88406e5a55909c5aff5269a86a7a9531534f7da2e4c303d8a318a72' +
'1c3c0c95956809532fcf0e2449a6b525b16aedf5aa0de657ba637b39',
'61353b4c2806934a777ff51fa22a4755699b2a714fcdc6f83766e5f97b6c7423' +
'73806900e49f24b22b097544d4896b424989b5e1ebac0f07c23f4598',
'3612d2e79e3b0785561be14aaca2fccb',
'feffe9928665731c6d6a8f9467308308',
'cafebabefacedbad'
),
(
'feedfacedeadbeeffeedfacedeadbeefabaddad2',
'd9313225f88406e5a55909c5aff5269a86a7a9531534f7da2e4c303d8a318a72' +
'1c3c0c95956809532fcf0e2449a6b525b16aedf5aa0de657ba637b39',
'8ce24998625615b603a033aca13fb894be9112a5c3a211a8ba262a3cca7e2ca7' +
'01e4a9a4fba43c90ccdcb281d48c7c6fd62875d2aca417034c34aee5',
'619cc5aefffe0bfa462af43c1699d050',
'feffe9928665731c6d6a8f9467308308',
'9313225df88406e555909c5aff5269aa' +
'6a7a9538534f7da1e4c303d2a318a728c3c0c95156809539fcf0e2429a6b5254' +
'16aedbf5a0de6a57a637b39b'
),
(
'',
'',
'',
'cd33b28ac773f74ba00ed1f312572435',
'000000000000000000000000000000000000000000000000',
'000000000000000000000000'
),
(
'',
'00000000000000000000000000000000',
'98e7247c07f0fe411c267e4384b0f600',
'2ff58d80033927ab8ef4d4587514f0fb',
'000000000000000000000000000000000000000000000000',
'000000000000000000000000'
),
(
'',
'd9313225f88406e5a55909c5aff5269a86a7a9531534f7da2e4c303d8a318a72' +
'1c3c0c95956809532fcf0e2449a6b525b16aedf5aa0de657ba637b391aafd255',
'3980ca0b3c00e841eb06fac4872a2757859e1ceaa6efd984628593b40ca1e19c' +
'7d773d00c144c525ac619d18c84a3f4718e2448b2fe324d9ccda2710acade256',
'9924a7c8587336bfb118024db8674a14',
'feffe9928665731c6d6a8f9467308308feffe9928665731c',
'cafebabefacedbaddecaf888'
),
(
'feedfacedeadbeeffeedfacedeadbeefabaddad2',
'd9313225f88406e5a55909c5aff5269a86a7a9531534f7da2e4c303d8a318a72' +
'1c3c0c95956809532fcf0e2449a6b525b16aedf5aa0de657ba637b39',
'3980ca0b3c00e841eb06fac4872a2757859e1ceaa6efd984628593b40ca1e19c' +
'7d773d00c144c525ac619d18c84a3f4718e2448b2fe324d9ccda2710',
'2519498e80f1478f37ba55bd6d27618c',
'feffe9928665731c6d6a8f9467308308feffe9928665731c',
'cafebabefacedbaddecaf888'
),
(
'feedfacedeadbeeffeedfacedeadbeefabaddad2',
'd9313225f88406e5a55909c5aff5269a86a7a9531534f7da2e4c303d8a318a72' +
'1c3c0c95956809532fcf0e2449a6b525b16aedf5aa0de657ba637b39',
'0f10f599ae14a154ed24b36e25324db8c566632ef2bbb34f8347280fc4507057' +
'fddc29df9a471f75c66541d4d4dad1c9e93a19a58e8b473fa0f062f7',
'65dcc57fcf623a24094fcca40d3533f8',
'feffe9928665731c6d6a8f9467308308feffe9928665731c',
'cafebabefacedbad'
),
(
'feedfacedeadbeeffeedfacedeadbeefabaddad2',
'd9313225f88406e5a55909c5aff5269a86a7a9531534f7da2e4c303d8a318a72' +
'1c3c0c95956809532fcf0e2449a6b525b16aedf5aa0de657ba637b39',
'd27e88681ce3243c4830165a8fdcf9ff1de9a1d8e6b447ef6ef7b79828666e45' +
'81e79012af34ddd9e2f037589b292db3e67c036745fa22e7e9b7373b',
'dcf566ff291c25bbb8568fc3d376a6d9',
'feffe9928665731c6d6a8f9467308308feffe9928665731c',
'9313225df88406e555909c5aff5269aa' +
'6a7a9538534f7da1e4c303d2a318a728c3c0c95156809539fcf0e2429a6b5254' +
'16aedbf5a0de6a57a637b39b'
),
(
'',
'',
'',
'530f8afbc74536b9a963b4f1c4cb738b',
'0000000000000000000000000000000000000000000000000000000000000000',
'000000000000000000000000'
),
(
'',
'00000000000000000000000000000000',
'cea7403d4d606b6e074ec5d3baf39d18',
'd0d1c8a799996bf0265b98b5d48ab919',
'0000000000000000000000000000000000000000000000000000000000000000',
'000000000000000000000000'
),
( '',
'd9313225f88406e5a55909c5aff5269a86a7a9531534f7da2e4c303d8a318a72' +
'1c3c0c95956809532fcf0e2449a6b525b16aedf5aa0de657ba637b391aafd255',
'522dc1f099567d07f47f37a32a84427d643a8cdcbfe5c0c97598a2bd2555d1aa' +
'8cb08e48590dbb3da7b08b1056828838c5f61e6393ba7a0abcc9f662898015ad',
'b094dac5d93471bdec1a502270e3cc6c',
'feffe9928665731c6d6a8f9467308308feffe9928665731c6d6a8f9467308308',
'cafebabefacedbaddecaf888'
),
(
'feedfacedeadbeeffeedfacedeadbeefabaddad2',
'd9313225f88406e5a55909c5aff5269a86a7a9531534f7da2e4c303d8a318a72' +
'1c3c0c95956809532fcf0e2449a6b525b16aedf5aa0de657ba637b39',
'522dc1f099567d07f47f37a32a84427d643a8cdcbfe5c0c97598a2bd2555d1aa' +
'8cb08e48590dbb3da7b08b1056828838c5f61e6393ba7a0abcc9f662',
'76fc6ece0f4e1768cddf8853bb2d551b',
'feffe9928665731c6d6a8f9467308308feffe9928665731c6d6a8f9467308308',
'cafebabefacedbaddecaf888'
),
(
'feedfacedeadbeeffeedfacedeadbeefabaddad2',
'd9313225f88406e5a55909c5aff5269a86a7a9531534f7da2e4c303d8a318a72' +
'1c3c0c95956809532fcf0e2449a6b525b16aedf5aa0de657ba637b39',
'c3762df1ca787d32ae47c13bf19844cbaf1ae14d0b976afac52ff7d79bba9de0' +
'feb582d33934a4f0954cc2363bc73f7862ac430e64abe499f47c9b1f',
'3a337dbf46a792c45e454913fe2ea8f2',
'feffe9928665731c6d6a8f9467308308feffe9928665731c6d6a8f9467308308',
'cafebabefacedbad'
),
(
'feedfacedeadbeeffeedfacedeadbeefabaddad2',
'd9313225f88406e5a55909c5aff5269a86a7a9531534f7da2e4c303d8a318a72' +
'1c3c0c95956809532fcf0e2449a6b525b16aedf5aa0de657ba637b39',
'5a8def2f0c9e53f1f75d7853659e2a20eeb2b22aafde6419a058ab4f6f746bf4' +
'0fc0c3b780f244452da3ebf1c5d82cdea2418997200ef82e44ae7e3f',
'a44a8266ee1c8eb0c8b5d4cf5ae9f19a',
'feffe9928665731c6d6a8f9467308308feffe9928665731c6d6a8f9467308308',
'9313225df88406e555909c5aff5269aa' +
'6a7a9538534f7da1e4c303d2a318a728c3c0c95156809539fcf0e2429a6b5254' +
'16aedbf5a0de6a57a637b39b'
)
]
test_vectors = [[unhexlify(x) for x in tv] for tv in test_vectors_hex]
def runTest(self):
for assoc_data, pt, ct, mac, key, nonce in self.test_vectors:
# Encrypt
cipher = AES.new(key, AES.MODE_GCM, nonce, mac_len=len(mac))
cipher.update(assoc_data)
ct2, mac2 = cipher.encrypt_and_digest(pt)
self.assertEqual(ct, ct2)
self.assertEqual(mac, mac2)
# Decrypt
cipher = AES.new(key, AES.MODE_GCM, nonce, mac_len=len(mac))
cipher.update(assoc_data)
pt2 = cipher.decrypt_and_verify(ct, mac)
self.assertEqual(pt, pt2)
class TestVectorsGueronKrasnov(unittest.TestCase):
"""Class exercising the GCM test vectors found in
'The fragility of AES-GCM authentication algorithm', Gueron, Krasnov
https://eprint.iacr.org/2013/157.pdf"""
def test_1(self):
key = unhexlify("3da6c536d6295579c0959a7043efb503")
iv = unhexlify("2b926197d34e091ef722db94")
aad = unhexlify("00000000000000000000000000000000" +
"000102030405060708090a0b0c0d0e0f" +
"101112131415161718191a1b1c1d1e1f" +
"202122232425262728292a2b2c2d2e2f" +
"303132333435363738393a3b3c3d3e3f")
digest = unhexlify("69dd586555ce3fcc89663801a71d957b")
cipher = AES.new(key, AES.MODE_GCM, iv).update(aad)
self.assertEqual(digest, cipher.digest())
def test_2(self):
key = unhexlify("843ffcf5d2b72694d19ed01d01249412")
iv = unhexlify("dbcca32ebf9b804617c3aa9e")
aad = unhexlify("00000000000000000000000000000000" +
"101112131415161718191a1b1c1d1e1f")
pt = unhexlify("000102030405060708090a0b0c0d0e0f" +
"101112131415161718191a1b1c1d1e1f" +
"202122232425262728292a2b2c2d2e2f" +
"303132333435363738393a3b3c3d3e3f" +
"404142434445464748494a4b4c4d4e4f")
ct = unhexlify("6268c6fa2a80b2d137467f092f657ac0" +
"4d89be2beaa623d61b5a868c8f03ff95" +
"d3dcee23ad2f1ab3a6c80eaf4b140eb0" +
"5de3457f0fbc111a6b43d0763aa422a3" +
"013cf1dc37fe417d1fbfc449b75d4cc5")
digest = unhexlify("3b629ccfbc1119b7319e1dce2cd6fd6d")
cipher = AES.new(key, AES.MODE_GCM, iv).update(aad)
ct2, digest2 = cipher.encrypt_and_digest(pt)
self.assertEqual(ct, ct2)
self.assertEqual(digest, digest2)
class NISTTestVectorsGCM(unittest.TestCase):
def __init__(self, a):
self.use_clmul = True
unittest.TestCase.__init__(self, a)
class NISTTestVectorsGCM_no_clmul(unittest.TestCase):
def __init__(self, a):
self.use_clmul = False
unittest.TestCase.__init__(self, a)
test_vectors_nist = load_test_vectors(
("Cipher", "AES"),
"gcmDecrypt128.rsp",
"GCM decrypt",
{"count": lambda x: int(x)}) or []
test_vectors_nist += load_test_vectors(
("Cipher", "AES"),
"gcmEncryptExtIV128.rsp",
"GCM encrypt",
{"count": lambda x: int(x)}) or []
for idx, tv in enumerate(test_vectors_nist):
# The test vector file contains some directive lines
if isinstance(tv, str):
continue
def single_test(self, tv=tv):
self.description = tv.desc
cipher = AES.new(tv.key, AES.MODE_GCM, nonce=tv.iv,
mac_len=len(tv.tag), use_clmul=self.use_clmul)
cipher.update(tv.aad)
if "FAIL" in tv.others:
self.assertRaises(ValueError, cipher.decrypt_and_verify,
tv.ct, tv.tag)
else:
pt = cipher.decrypt_and_verify(tv.ct, tv.tag)
self.assertEqual(pt, tv.pt)
setattr(NISTTestVectorsGCM, "test_%d" % idx, single_test)
setattr(NISTTestVectorsGCM_no_clmul, "test_%d" % idx, single_test)
class TestVectorsWycheproof(unittest.TestCase):
def __init__(self, wycheproof_warnings, **extra_params):
unittest.TestCase.__init__(self)
self._wycheproof_warnings = wycheproof_warnings
self._extra_params = extra_params
self._id = "None"
def setUp(self):
def filter_tag(group):
return group['tagSize'] // 8
self.tv = load_test_vectors_wycheproof(("Cipher", "wycheproof"),
"aes_gcm_test.json",
"Wycheproof GCM",
group_tag={'tag_size': filter_tag})
def shortDescription(self):
return self._id
def warn(self, tv):
if tv.warning and self._wycheproof_warnings:
import warnings
warnings.warn("Wycheproof warning: %s (%s)" % (self._id, tv.comment))
def test_encrypt(self, tv):
self._id = "Wycheproof Encrypt GCM Test #" + str(tv.id)
try:
cipher = AES.new(tv.key, AES.MODE_GCM, tv.iv, mac_len=tv.tag_size,
**self._extra_params)
except ValueError as e:
if len(tv.iv) == 0 and "Nonce cannot be empty" in str(e):
return
raise e
cipher.update(tv.aad)
ct, tag = cipher.encrypt_and_digest(tv.msg)
if tv.valid:
self.assertEqual(ct, tv.ct)
self.assertEqual(tag, tv.tag)
self.warn(tv)
def test_decrypt(self, tv):
self._id = "Wycheproof Decrypt GCM Test #" + str(tv.id)
try:
cipher = AES.new(tv.key, AES.MODE_GCM, tv.iv, mac_len=tv.tag_size,
**self._extra_params)
except ValueError as e:
if len(tv.iv) == 0 and "Nonce cannot be empty" in str(e):
return
raise e
cipher.update(tv.aad)
try:
pt = cipher.decrypt_and_verify(tv.ct, tv.tag)
except ValueError:
assert not tv.valid
else:
assert tv.valid
self.assertEqual(pt, tv.msg)
self.warn(tv)
def test_corrupt_decrypt(self, tv):
self._id = "Wycheproof Corrupt Decrypt GCM Test #" + str(tv.id)
if len(tv.iv) == 0 or len(tv.ct) < 1:
return
cipher = AES.new(tv.key, AES.MODE_GCM, tv.iv, mac_len=tv.tag_size,
**self._extra_params)
cipher.update(tv.aad)
ct_corrupt = strxor(tv.ct, b"\x00" * (len(tv.ct) - 1) + b"\x01")
self.assertRaises(ValueError, cipher.decrypt_and_verify, ct_corrupt, tv.tag)
def runTest(self):
for tv in self.tv:
self.test_encrypt(tv)
self.test_decrypt(tv)
self.test_corrupt_decrypt(tv)
class TestVariableLength(unittest.TestCase):
def __init__(self, **extra_params):
unittest.TestCase.__init__(self)
self._extra_params = extra_params
def runTest(self):
key = b'0' * 16
h = SHA256.new()
for length in range(160):
nonce = '{0:04d}'.format(length).encode('utf-8')
data = bchr(length) * length
cipher = AES.new(key, AES.MODE_GCM, nonce=nonce, **self._extra_params)
ct, tag = cipher.encrypt_and_digest(data)
h.update(ct)
h.update(tag)
self.assertEqual(h.hexdigest(), "7b7eb1ffbe67a2e53a912067c0ec8e62ebc7ce4d83490ea7426941349811bdf4")
def get_tests(config={}):
from Crypto.Util import _cpu_features
wycheproof_warnings = config.get('wycheproof_warnings')
tests = []
tests += list_test_cases(GcmTests)
tests += list_test_cases(GcmFSMTests)
tests += [TestVectors()]
tests += [TestVectorsWycheproof(wycheproof_warnings)]
tests += list_test_cases(TestVectorsGueronKrasnov)
tests += [TestVariableLength()]
if config.get('slow_tests'):
tests += list_test_cases(NISTTestVectorsGCM)
if _cpu_features.have_clmul():
tests += [TestVectorsWycheproof(wycheproof_warnings, use_clmul=False)]
tests += [TestVariableLength(use_clmul=False)]
if config.get('slow_tests'):
tests += list_test_cases(NISTTestVectorsGCM_no_clmul)
else:
print("Skipping test of PCLMULDQD in AES GCM")
return tests
if __name__ == '__main__':
def suite():
unittest.TestSuite(get_tests())
unittest.main(defaultTest='suite')
|