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diff --git a/lib/Crypto/SelfTest/Cipher/test_CCM.py b/lib/Crypto/SelfTest/Cipher/test_CCM.py
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+++ b/lib/Crypto/SelfTest/Cipher/test_CCM.py
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+# ===================================================================
+#
+# 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.
+# ===================================================================
+
+import unittest
+from binascii import unhexlify
+
+from Crypto.SelfTest.st_common import list_test_cases
+from Crypto.SelfTest.loader import load_test_vectors_wycheproof
+from Crypto.Util.py3compat import tobytes, bchr
+from Crypto.Cipher import AES
+from Crypto.Hash import SHAKE128
+
+from Crypto.Util.strxor import strxor
+
+
+def get_tag_random(tag, length):
+ return SHAKE128.new(data=tobytes(tag)).read(length)
+
+
+class CcmTests(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_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)
+ self.assertEqual(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
+ self.assertEqual(len(nonce1), 11)
+ self.assertNotEqual(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)
+ self.assertEqual(ct, cipher.encrypt(self.data))
+
+ def test_nonce_must_be_bytes(self):
+ self.assertRaises(TypeError, AES.new, self.key_128, AES.MODE_CCM,
+ nonce=u'test12345678')
+
+ def test_nonce_length(self):
+ self.assertRaises(ValueError, AES.new, self.key_128, AES.MODE_CCM,
+ nonce=b"")
+ self.assertRaises(ValueError, AES.new, self.key_128, AES.MODE_CCM,
+ nonce=bchr(1) * 6)
+ self.assertRaises(ValueError, AES.new, self.key_128, AES.MODE_CCM,
+ nonce=bchr(1) * 14)
+ for x in range(7, 13 + 1):
+ AES.new(self.key_128, AES.MODE_CCM, nonce=bchr(1) * x)
+
+ def test_block_size(self):
+ cipher = AES.new(self.key_128, AES.MODE_CCM, 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_CCM, nonce=self.nonce_96)
+ self.assertEqual(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
+ self.assertEqual(len(nonce1), 11)
+ self.assertNotEqual(nonce1, nonce2)
+
+ def test_unknown_parameters(self):
+ self.assertRaises(TypeError, AES.new, self.key_128, AES.MODE_CCM,
+ self.nonce_96, 7)
+ self.assertRaises(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"")
+ self.assertEqual(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"")
+ self.assertRaises(TypeError, cipher.decrypt, b"")
+
+ cipher = AES.new(self.key_128, AES.MODE_CCM, 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_CCM, nonce=self.nonce_96)
+ self.assertRaises(TypeError, cipher.encrypt, u'test1234567890-*')
+
+ cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
+ self.assertRaises(TypeError, cipher.decrypt, u'test1234567890-*')
+
+ def test_mac_len(self):
+ # Invalid MAC length
+ for mac_len in range(3, 17 + 1, 2):
+ self.assertRaises(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)
+ self.assertEqual(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)
+ 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_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)
+ self.assertRaises(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()
+ self.assertEqual(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)
+ self.assertRaises(ValueError, cipher.update, b"1")
+
+ # Too large
+ cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96,
+ assoc_len=15)
+ self.assertRaises(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)
+ self.assertRaises(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)
+ self.assertRaises(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)
+ self.assertRaises(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)
+ self.assertRaises(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)
+ self.assertRaises(ValueError, cipher.digest)
+
+ cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96,
+ msg_len=DATA_LEN - 1)
+ self.assertRaises(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)
+ self.assertRaises(ValueError, cipher.verify, mac)
+
+ cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96,
+ msg_len=DATA_LEN - 1)
+ self.assertRaises(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)
+ 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_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)
+ 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_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()
+
+ 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_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))
+
+ 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_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()
+
+ 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_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))
+
+ self.assertEqual(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)
+ self.assertEqual(ct, output)
+ self.assertEqual(res, None)
+
+ cipher = AES.new(self.key_128, AES.MODE_CCM, 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_CCM, 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_CCM, 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_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)
+ self.assertEqual(ct, output)
+
+ cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
+ cipher.decrypt(ct, output=output)
+ self.assertEqual(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)
+ self.assertRaises(TypeError, cipher.encrypt, pt, output=b'0'*16)
+
+ cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
+ self.assertRaises(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)
+ self.assertRaises(ValueError, cipher.encrypt, pt, output=shorter_output)
+ cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
+ self.assertRaises(ValueError, cipher.decrypt, ct, output=shorter_output)
+
+
+class CcmFSMTests(unittest.TestCase):
+
+ 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):
+ self.assertEqual(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)
+ self.assertEqual(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)
+ self.assertRaises(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)
+ 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_CCM, 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_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)
+ self.assertRaises(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)
+ self.assertRaises(TypeError, getattr(cipher, method_name),
+ self.data)
+
+
+class TestVectors(unittest.TestCase):
+ """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(0,16) for y in range(0,16)]))*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 runTest(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)
+ self.assertEqual(ct, ct2)
+ self.assertEqual(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)
+ self.assertEqual(pt, pt2)
+
+
+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_ccm_test.json",
+ "Wycheproof AES CCM",
+ 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 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:
+ self.assertEqual(ct, tv.ct)
+ self.assertEqual(tag, tv.tag)
+ self.warn(tv)
+
+ def test_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
+ self.assertEqual(pt, tv.msg)
+ self.warn(tv)
+
+ def test_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")
+ 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)
+
+
+def get_tests(config={}):
+ wycheproof_warnings = config.get('wycheproof_warnings')
+
+ tests = []
+ tests += list_test_cases(CcmTests)
+ tests += list_test_cases(CcmFSMTests)
+ tests += [TestVectors()]
+ tests += [TestVectorsWycheproof(wycheproof_warnings)]
+
+ return tests
+
+
+if __name__ == '__main__':
+ def suite():
+ unittest.TestSuite(get_tests())
+ unittest.main(defaultTest='suite')

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