# SPDX-FileCopyrightText: 2015 Legrandin # SPDX-License-Identifier: BSD-2-Clause from binascii import unhexlify import pytest from Crypto.Cipher import AES from Crypto.Cipher._mode_ccm import CCMMessageTooLongError from Crypto.Hash import SHAKE128 from Crypto.SelfTest.loader import load_test_vectors_wycheproof, wycheproof_id from Crypto.SelfTest.st_common import wycheproof_warnings from Crypto.Util._bytes import tobytes from Crypto.Util.strxor import strxor def get_tag_random(tag, length): return SHAKE128.new(data=tobytes(tag)).read(length) class TestCcm: 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_CCM, nonce=self.nonce_96) pt = get_tag_random("plaintext", 16 * 100) ct = cipher.encrypt(pt) cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96) pt2 = cipher.decrypt(ct) assert pt == pt2 def test_nonce(self): # If not passed, the nonce is created randomly cipher = AES.new(self.key_128, AES.MODE_CCM) nonce1 = cipher.nonce cipher = AES.new(self.key_128, AES.MODE_CCM) nonce2 = cipher.nonce assert len(nonce1) == 11 assert nonce1 != nonce2 cipher = AES.new(self.key_128, AES.MODE_CCM, self.nonce_96) ct = cipher.encrypt(self.data) cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96) assert ct == cipher.encrypt(self.data) def test_nonce_must_be_bytes(self): with pytest.raises(TypeError): AES.new(self.key_128, AES.MODE_CCM, nonce="test12345678") def test_nonce_length(self): with pytest.raises(ValueError): AES.new(self.key_128, AES.MODE_CCM, nonce=b"") with pytest.raises(ValueError): AES.new(self.key_128, AES.MODE_CCM, nonce=bytes([1]) * 6) with pytest.raises(ValueError): AES.new(self.key_128, AES.MODE_CCM, nonce=bytes([1]) * 14) for x in range(7, 13 + 1): AES.new(self.key_128, AES.MODE_CCM, nonce=bytes([1]) * x) def test_block_size(self): cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96) assert cipher.block_size == AES.block_size def test_nonce_attribute(self): cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96) assert cipher.nonce == self.nonce_96 # By default, a 11 bytes long nonce is randomly generated nonce1 = AES.new(self.key_128, AES.MODE_CCM).nonce nonce2 = AES.new(self.key_128, AES.MODE_CCM).nonce assert len(nonce1) == 11 assert nonce1 != nonce2 def test_unknown_parameters(self): with pytest.raises(TypeError): AES.new(self.key_128, AES.MODE_CCM, self.nonce_96, 7) with pytest.raises(TypeError): AES.new(self.key_128, AES.MODE_CCM, 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_CCM, 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_CCM, nonce=self.nonce_96) result = getattr(cipher, func)(b"") assert result == b"" def test_either_encrypt_or_decrypt(self): cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96) cipher.encrypt(b"") with pytest.raises(TypeError): cipher.decrypt(b"") cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96) cipher.decrypt(b"") with pytest.raises(TypeError): cipher.encrypt(b"") def test_data_must_be_bytes(self): cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96) with pytest.raises(TypeError): cipher.encrypt("test1234567890-*") cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96) with pytest.raises(TypeError): cipher.decrypt("test1234567890-*") def test_mac_len(self): # Invalid MAC length for mac_len in range(3, 17 + 1, 2): with pytest.raises(ValueError): AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96, mac_len=mac_len) # Valid MAC length for mac_len in range(4, 16 + 1, 2): cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96, mac_len=mac_len) _, mac = cipher.encrypt_and_digest(self.data) assert len(mac) == mac_len # Default MAC length cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96) _, mac = cipher.encrypt_and_digest(self.data) assert len(mac) == 16 def test_invalid_mac(self): from Crypto.Util.strxor import strxor_c cipher = AES.new(self.key_128, AES.MODE_CCM, 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_CCM, nonce=self.nonce_96) with pytest.raises(ValueError): cipher.decrypt_and_verify(ct, invalid_mac) def test_hex_mac(self): cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96) mac_hex = cipher.hexdigest() assert cipher.digest() == unhexlify(mac_hex) cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96) cipher.hexverify(mac_hex) def test_longer_assoc_data_than_declared(self): # More than zero cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96, assoc_len=0) with pytest.raises(ValueError): cipher.update(b"1") # Too large cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96, assoc_len=15) with pytest.raises(ValueError): cipher.update(self.data) def test_shorter_assoc_data_than_expected(self): DATA_LEN = len(self.data) # With plaintext cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96, assoc_len=DATA_LEN + 1) cipher.update(self.data) with pytest.raises(ValueError): cipher.encrypt(self.data) # With empty plaintext cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96, assoc_len=DATA_LEN + 1) cipher.update(self.data) with pytest.raises(ValueError): cipher.digest() # With ciphertext cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96, assoc_len=DATA_LEN + 1) cipher.update(self.data) with pytest.raises(ValueError): cipher.decrypt(self.data) # With empty ciphertext cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96) cipher.update(self.data) mac = cipher.digest() cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96, assoc_len=DATA_LEN + 1) cipher.update(self.data) with pytest.raises(ValueError): cipher.verify(mac) def test_shorter_and_longer_plaintext_than_declared(self): DATA_LEN = len(self.data) cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96, msg_len=DATA_LEN + 1) cipher.encrypt(self.data) with pytest.raises(ValueError): cipher.digest() cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96, msg_len=DATA_LEN - 1) with pytest.raises(ValueError): cipher.encrypt(self.data) def test_shorter_ciphertext_than_declared(self): DATA_LEN = len(self.data) cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96) ct, mac = cipher.encrypt_and_digest(self.data) cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96, msg_len=DATA_LEN + 1) cipher.decrypt(ct) with pytest.raises(ValueError): cipher.verify(mac) cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96, msg_len=DATA_LEN - 1) with pytest.raises(ValueError): cipher.decrypt(ct) 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_CCM, 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_CCM, nonce=self.nonce_96, msg_len=127, assoc_len=127) 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) assert 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_CCM, nonce=self.nonce_96, msg_len=127, assoc_len=127) 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) assert ciphertext == ct2 assert 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_CCM, nonce=self.nonce_96) cipher1.update(self.data) ct = cipher1.encrypt(self.data) tag = cipher1.digest() cipher2 = AES.new(key_ba, AES.MODE_CCM, 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() assert ct == ct_test assert tag == tag_test assert 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_CCM, 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)) assert 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_CCM, nonce=self.nonce_96) cipher1.update(self.data) ct = cipher1.encrypt(self.data) tag = cipher1.digest() cipher2 = AES.new(key_mv, AES.MODE_CCM, 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() assert ct == ct_test assert tag == tag_test assert 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_CCM, 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)) assert self.data == pt_test def test_output_param(self): pt = b"5" * 128 cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96) ct = cipher.encrypt(pt) tag = cipher.digest() output = bytearray(128) cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96) res = cipher.encrypt(pt, output=output) assert ct == output assert res is None cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96) res = cipher.decrypt(ct, output=output) assert pt == output assert res is None cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96) res, tag_out = cipher.encrypt_and_digest(pt, output=output) assert ct == output assert res is None assert tag == tag_out cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96) res = cipher.decrypt_and_verify(ct, tag, output=output) assert pt == output assert res is None def test_output_param_memoryview(self): pt = b"5" * 128 cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96) ct = cipher.encrypt(pt) output = memoryview(bytearray(128)) cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96) cipher.encrypt(pt, output=output) assert ct == output cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96) cipher.decrypt(ct, output=output) assert pt == output def test_output_param_neg(self): pt = b"5" * 16 cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96) ct = cipher.encrypt(pt) cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96) with pytest.raises(TypeError): cipher.encrypt(pt, output=b"0" * 16) cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96) with pytest.raises(TypeError): cipher.decrypt(ct, output=b"0" * 16) shorter_output = bytearray(15) cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96) with pytest.raises(ValueError): cipher.encrypt(pt, output=shorter_output) cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96) with pytest.raises(ValueError): cipher.decrypt(ct, output=shorter_output) def test_message_too_long(self): nonce = b"N" * 13 with pytest.raises(CCMMessageTooLongError): AES.new( self.key_128, AES.MODE_CCM, nonce=nonce, assoc_len=20, msg_len=0x10000, ) nonce = b"N" * 7 with pytest.raises(CCMMessageTooLongError): AES.new( self.key_128, AES.MODE_CCM, nonce=nonce, assoc_len=20, msg_len=2**64, ) nonce = b"N" * 13 cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=nonce) with pytest.raises(CCMMessageTooLongError): cipher.encrypt(b"C" * 0x10000) nonce = b"N" * 13 cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=nonce) with pytest.raises(CCMMessageTooLongError): cipher.decrypt(b"C" * 0x10000) class TestCcmFSM: key_128 = get_tag_random("key_128", 16) nonce_96 = get_tag_random("nonce_128", 12) data = get_tag_random("data", 16) def test_valid_init_encrypt_decrypt_digest_verify(self): # No authenticated data, fixed plaintext for assoc_len in (None, 0): for msg_len in (None, len(self.data)): # Verify path INIT->ENCRYPT->DIGEST cipher = AES.new( self.key_128, AES.MODE_CCM, nonce=self.nonce_96, assoc_len=assoc_len, msg_len=msg_len ) ct = cipher.encrypt(self.data) mac = cipher.digest() # Verify path INIT->DECRYPT->VERIFY cipher = AES.new( self.key_128, AES.MODE_CCM, nonce=self.nonce_96, assoc_len=assoc_len, msg_len=msg_len ) cipher.decrypt(ct) cipher.verify(mac) def test_valid_init_update_digest_verify(self): # No plaintext, fixed authenticated data for assoc_len in (None, len(self.data)): for msg_len in (None, 0): # Verify path INIT->UPDATE->DIGEST cipher = AES.new( self.key_128, AES.MODE_CCM, nonce=self.nonce_96, assoc_len=assoc_len, msg_len=msg_len ) cipher.update(self.data) mac = cipher.digest() # Verify path INIT->UPDATE->VERIFY cipher = AES.new( self.key_128, AES.MODE_CCM, nonce=self.nonce_96, assoc_len=assoc_len, msg_len=msg_len ) cipher.update(self.data) cipher.verify(mac) def test_valid_full_path(self): # Fixed authenticated data, fixed plaintext for assoc_len in (None, len(self.data)): for msg_len in (None, len(self.data)): # Verify path INIT->UPDATE->ENCRYPT->DIGEST cipher = AES.new( self.key_128, AES.MODE_CCM, nonce=self.nonce_96, assoc_len=assoc_len, msg_len=msg_len ) 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_CCM, nonce=self.nonce_96, assoc_len=assoc_len, msg_len=msg_len ) 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_CCM, nonce=self.nonce_96) cipher.digest() def test_valid_init_verify(self): # Verify path INIT->VERIFY cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96) mac = cipher.digest() cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96) cipher.verify(mac) def test_valid_multiple_encrypt_or_decrypt(self): # Only possible if msg_len is declared in advance 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_CCM, nonce=self.nonce_96, msg_len=64, assoc_len=assoc_len ) 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_CCM, nonce=self.nonce_96) cipher.update(self.data) first_mac = cipher.digest() for _x in range(4): assert first_mac == cipher.digest() # Multiple calls to verify cipher = AES.new(self.key_128, AES.MODE_CCM, 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_CCM, 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_CCM, nonce=self.nonce_96) cipher.update(self.data) pt = cipher.decrypt_and_verify(ct, mac) assert self.data == pt def test_invalid_multiple_encrypt_decrypt_without_msg_len(self): # Once per method, with or without assoc. data for method_name in "encrypt", "decrypt": for assoc_data_present in (True, False): cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96) if assoc_data_present: cipher.update(self.data) method = getattr(cipher, method_name) method(self.data) with pytest.raises(TypeError): method(self.data) 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_CCM, nonce=self.nonce_96, msg_len=32) if assoc_data_present: cipher.update(self.data) getattr(cipher, method1_name)(self.data) with pytest.raises(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_CCM, nonce=self.nonce_96) cipher.encrypt(self.data) cipher.digest() with pytest.raises(TypeError): getattr(cipher, method_name)(self.data) cipher = AES.new(self.key_128, AES.MODE_CCM, 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_CCM, 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_CCM, nonce=self.nonce_96) cipher.decrypt(ct) cipher.verify(mac) with pytest.raises(TypeError): getattr(cipher, method_name)(self.data) cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96) cipher.decrypt_and_verify(ct, mac) with pytest.raises(TypeError): getattr(cipher, method_name)(self.data) class TestVectors: """Class exercising the CCM test vectors found in Appendix C of NIST SP 800-38C and in RFC 3610""" # List of test vectors, each made up of: # - authenticated data # - plaintext # - ciphertext # - MAC # - AES key # - nonce test_vectors_hex = [ # NIST SP 800 38C ( "0001020304050607", "20212223", "7162015b", "4dac255d", "404142434445464748494a4b4c4d4e4f", "10111213141516", ), ( "000102030405060708090a0b0c0d0e0f", "202122232425262728292a2b2c2d2e2f", "d2a1f0e051ea5f62081a7792073d593d", "1fc64fbfaccd", "404142434445464748494a4b4c4d4e4f", "1011121314151617", ), ( "000102030405060708090a0b0c0d0e0f10111213", "202122232425262728292a2b2c2d2e2f3031323334353637", "e3b201a9f5b71a7a9b1ceaeccd97e70b6176aad9a4428aa5", "484392fbc1b09951", "404142434445464748494a4b4c4d4e4f", "101112131415161718191a1b", ), ( ("".join(["%02X" % (x * 16 + y) for x in range(16) for y in range(16)])) * 256, "202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f", "69915dad1e84c6376a68c2967e4dab615ae0fd1faec44cc484828529463ccf72", "b4ac6bec93e8598e7f0dadbcea5b", "404142434445464748494a4b4c4d4e4f", "101112131415161718191a1b1c", ), # RFC3610 ( "0001020304050607", "08090a0b0c0d0e0f101112131415161718191a1b1c1d1e", "588c979a61c663d2f066d0c2c0f989806d5f6b61dac384", "17e8d12cfdf926e0", "c0c1c2c3c4c5c6c7c8c9cacbcccdcecf", "00000003020100a0a1a2a3a4a5", ), ( "0001020304050607", "08090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f", "72c91a36e135f8cf291ca894085c87e3cc15c439c9e43a3b", "a091d56e10400916", "c0c1c2c3c4c5c6c7c8c9cacbcccdcecf", "00000004030201a0a1a2a3a4a5", ), ( "0001020304050607", "08090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f20", "51b1e5f44a197d1da46b0f8e2d282ae871e838bb64da859657", "4adaa76fbd9fb0c5", "c0c1c2c3c4c5c6c7c8c9cacbcccdcecf", "00000005040302A0A1A2A3A4A5", ), ( "000102030405060708090a0b", "0c0d0e0f101112131415161718191a1b1c1d1e", "a28c6865939a9a79faaa5c4c2a9d4a91cdac8c", "96c861b9c9e61ef1", "c0c1c2c3c4c5c6c7c8c9cacbcccdcecf", "00000006050403a0a1a2a3a4a5", ), ( "000102030405060708090a0b", "0c0d0e0f101112131415161718191a1b1c1d1e1f", "dcf1fb7b5d9e23fb9d4e131253658ad86ebdca3e", "51e83f077d9c2d93", "c0c1c2c3c4c5c6c7c8c9cacbcccdcecf", "00000007060504a0a1a2a3a4a5", ), ( "000102030405060708090a0b", "0c0d0e0f101112131415161718191a1b1c1d1e1f20", "6fc1b011f006568b5171a42d953d469b2570a4bd87", "405a0443ac91cb94", "c0c1c2c3c4c5c6c7c8c9cacbcccdcecf", "00000008070605a0a1a2a3a4a5", ), ( "0001020304050607", "08090a0b0c0d0e0f101112131415161718191a1b1c1d1e", "0135d1b2c95f41d5d1d4fec185d166b8094e999dfed96c", "048c56602c97acbb7490", "c0c1c2c3c4c5c6c7c8c9cacbcccdcecf", "00000009080706a0a1a2a3a4a5", ), ( "0001020304050607", "08090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f", "7b75399ac0831dd2f0bbd75879a2fd8f6cae6b6cd9b7db24", "c17b4433f434963f34b4", "c0c1c2c3c4c5c6c7c8c9cacbcccdcecf", "0000000a090807a0a1a2a3a4a5", ), ( "0001020304050607", "08090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f20", "82531a60cc24945a4b8279181ab5c84df21ce7f9b73f42e197", "ea9c07e56b5eb17e5f4e", "c0c1c2c3c4c5c6c7c8c9cacbcccdcecf", "0000000b0a0908a0a1a2a3a4a5", ), ( "000102030405060708090a0b", "0c0d0e0f101112131415161718191a1b1c1d1e", "07342594157785152b074098330abb141b947b", "566aa9406b4d999988dd", "c0c1c2c3c4c5c6c7c8c9cacbcccdcecf", "0000000c0b0a09a0a1a2a3a4a5", ), ( "000102030405060708090a0b", "0c0d0e0f101112131415161718191a1b1c1d1e1f", "676bb20380b0e301e8ab79590a396da78b834934", "f53aa2e9107a8b6c022c", "c0c1c2c3c4c5c6c7c8c9cacbcccdcecf", "0000000d0c0b0aa0a1a2a3a4a5", ), ( "000102030405060708090a0b", "0c0d0e0f101112131415161718191a1b1c1d1e1f20", "c0ffa0d6f05bdb67f24d43a4338d2aa4bed7b20e43", "cd1aa31662e7ad65d6db", "c0c1c2c3c4c5c6c7c8c9cacbcccdcecf", "0000000e0d0c0ba0a1a2a3a4a5", ), ( "0be1a88bace018b1", "08e8cf97d820ea258460e96ad9cf5289054d895ceac47c", "4cb97f86a2a4689a877947ab8091ef5386a6ffbdd080f8", "e78cf7cb0cddd7b3", "d7828d13b2b0bdc325a76236df93cc6b", "00412b4ea9cdbe3c9696766cfa", ), ( "63018f76dc8a1bcb", "9020ea6f91bdd85afa0039ba4baff9bfb79c7028949cd0ec", "4ccb1e7ca981befaa0726c55d378061298c85c92814abc33", "c52ee81d7d77c08a", "d7828d13b2b0bdc325a76236df93cc6b", "0033568ef7b2633c9696766cfa", ), ( "aa6cfa36cae86b40", "b916e0eacc1c00d7dcec68ec0b3bbb1a02de8a2d1aa346132e", "b1d23a2220ddc0ac900d9aa03c61fcf4a559a4417767089708", "a776796edb723506", "d7828d13b2b0bdc325a76236df93cc6b", "00103fe41336713c9696766cfa", ), ( "d0d0735c531e1becf049c244", "12daac5630efa5396f770ce1a66b21f7b2101c", "14d253c3967b70609b7cbb7c49916028324526", "9a6f49975bcadeaf", "d7828d13b2b0bdc325a76236df93cc6b", "00764c63b8058e3c9696766cfa", ), ( "77b60f011c03e1525899bcae", "e88b6a46c78d63e52eb8c546efb5de6f75e9cc0d", "5545ff1a085ee2efbf52b2e04bee1e2336c73e3f", "762c0c7744fe7e3c", "d7828d13b2b0bdc325a76236df93cc6b", "00f8b678094e3b3c9696766cfa", ), ( "cd9044d2b71fdb8120ea60c0", "6435acbafb11a82e2f071d7ca4a5ebd93a803ba87f", "009769ecabdf48625594c59251e6035722675e04c8", "47099e5ae0704551", "d7828d13b2b0bdc325a76236df93cc6b", "00d560912d3f703c9696766cfa", ), ( "d85bc7e69f944fb8", "8a19b950bcf71a018e5e6701c91787659809d67dbedd18", "bc218daa947427b6db386a99ac1aef23ade0b52939cb6a", "637cf9bec2408897c6ba", "d7828d13b2b0bdc325a76236df93cc6b", "0042fff8f1951c3c9696766cfa", ), ( "74a0ebc9069f5b37", "1761433c37c5a35fc1f39f406302eb907c6163be38c98437", "5810e6fd25874022e80361a478e3e9cf484ab04f447efff6", "f0a477cc2fc9bf548944", "d7828d13b2b0bdc325a76236df93cc6b", "00920f40e56cdc3c9696766cfa", ), ( "44a3aa3aae6475ca", "a434a8e58500c6e41530538862d686ea9e81301b5ae4226bfa", "f2beed7bc5098e83feb5b31608f8e29c38819a89c8e776f154", "4d4151a4ed3a8b87b9ce", "d7828d13b2b0bdc325a76236df93cc6b", "0027ca0c7120bc3c9696766cfa", ), ( "ec46bb63b02520c33c49fd70", "b96b49e21d621741632875db7f6c9243d2d7c2", "31d750a09da3ed7fddd49a2032aabf17ec8ebf", "7d22c8088c666be5c197", "d7828d13b2b0bdc325a76236df93cc6b", "005b8ccbcd9af83c9696766cfa", ), ( "47a65ac78b3d594227e85e71", "e2fcfbb880442c731bf95167c8ffd7895e337076", "e882f1dbd38ce3eda7c23f04dd65071eb41342ac", "df7e00dccec7ae52987d", "d7828d13b2b0bdc325a76236df93cc6b", "003ebe94044b9a3c9696766cfa", ), ( "6e37a6ef546d955d34ab6059", "abf21c0b02feb88f856df4a37381bce3cc128517d4", "f32905b88a641b04b9c9ffb58cc390900f3da12ab1", "6dce9e82efa16da62059", "d7828d13b2b0bdc325a76236df93cc6b", "008d493b30ae8b3c9696766cfa", ), ] test_vectors = [[unhexlify(x) for x in tv] for tv in test_vectors_hex] def test(self): for assoc_data, pt, ct, mac, key, nonce in self.test_vectors: # Encrypt cipher = AES.new(key, AES.MODE_CCM, nonce, mac_len=len(mac)) cipher.update(assoc_data) ct2, mac2 = cipher.encrypt_and_digest(pt) assert ct == ct2 assert mac == mac2 # Decrypt cipher = AES.new(key, AES.MODE_CCM, nonce, mac_len=len(mac)) cipher.update(assoc_data) pt2 = cipher.decrypt_and_verify(ct, mac) assert pt == pt2 def load_wycheproof_vectors(): def filter_tag(group): return group["tagSize"] // 8 return load_test_vectors_wycheproof( ("Cipher", "wycheproof"), "aes_ccm_test.json", "Wycheproof AES CCM", group_tag={"tag_size": filter_tag}, ) class TestVectorsWycheproof: _extra_params: dict = {} _id = "None" def warn(self, tv): if tv.warning and wycheproof_warnings(): import warnings warnings.warn("Wycheproof warning: %s (%s)" % (self._id, tv.comment)) def check_encrypt(self, tv): self._id = "Wycheproof Encrypt CCM Test #" + str(tv.id) try: cipher = AES.new(tv.key, AES.MODE_CCM, tv.iv, mac_len=tv.tag_size, **self._extra_params) except ValueError as e: if len(tv.iv) not in range(7, 13 + 1, 2) and "Length of parameter 'nonce'" in str(e): assert not tv.valid return if tv.tag_size not in range(4, 16 + 1, 2) and "Parameter 'mac_len'" in str(e): assert not tv.valid return raise e cipher.update(tv.aad) ct, tag = cipher.encrypt_and_digest(tv.msg) if tv.valid: assert ct == tv.ct assert tag == tv.tag self.warn(tv) def check_decrypt(self, tv): self._id = "Wycheproof Decrypt CCM Test #" + str(tv.id) try: cipher = AES.new(tv.key, AES.MODE_CCM, tv.iv, mac_len=tv.tag_size, **self._extra_params) except ValueError as e: if len(tv.iv) not in range(7, 13 + 1, 2) and "Length of parameter 'nonce'" in str(e): assert not tv.valid return if tv.tag_size not in range(4, 16 + 1, 2) and "Parameter 'mac_len'" in str(e): assert not tv.valid 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 assert pt == tv.msg self.warn(tv) def check_corrupt_decrypt(self, tv): self._id = "Wycheproof Corrupt Decrypt CCM Test #" + str(tv.id) if len(tv.iv) not in range(7, 13 + 1, 2) or len(tv.ct) == 0: return cipher = AES.new(tv.key, AES.MODE_CCM, 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") with pytest.raises(ValueError): cipher.decrypt_and_verify(ct_corrupt, tv.tag) @pytest.mark.parametrize("tv", load_wycheproof_vectors(), ids=wycheproof_id) def test(self, tv): self.check_encrypt(tv) self.check_decrypt(tv) self.check_corrupt_decrypt(tv)