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Editing: test_GCM.py
# =================================================================== # # 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')
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