test_ChaCha20_Poly1305.py
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| py
Geri
# =================================================================== # # Copyright (c) 2018, Helder Eijs <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 from Crypto.Cipher import ChaCha20_Poly1305 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 ChaCha20Poly1305Tests(unittest.TestCase): key_256 = get_tag_random("key_256", 32) nonce_96 = get_tag_random("nonce_96", 12) data_128 = get_tag_random("data_128", 16) def test_loopback(self): cipher = ChaCha20_Poly1305.new(key=self.key_256, nonce=self.nonce_96) pt = get_tag_random("plaintext", 16 * 100) ct = cipher.encrypt(pt) cipher = ChaCha20_Poly1305.new(key=self.key_256, nonce=self.nonce_96) pt2 = cipher.decrypt(ct) self.assertEqual(pt, pt2) def test_nonce(self): # Nonce can only be 8 or 12 bytes cipher = ChaCha20_Poly1305.new(key=self.key_256, nonce=b'H' * 8) self.assertEqual(len(cipher.nonce), 8) cipher = ChaCha20_Poly1305.new(key=self.key_256, nonce=b'H' * 12) self.assertEqual(len(cipher.nonce), 12) # If not passed, the nonce is created randomly cipher = ChaCha20_Poly1305.new(key=self.key_256) nonce1 = cipher.nonce cipher = ChaCha20_Poly1305.new(key=self.key_256) nonce2 = cipher.nonce self.assertEqual(len(nonce1), 12) self.assertNotEqual(nonce1, nonce2) cipher = ChaCha20_Poly1305.new(key=self.key_256, nonce=self.nonce_96) ct = cipher.encrypt(self.data_128) cipher = ChaCha20_Poly1305.new(key=self.key_256, nonce=self.nonce_96) self.assertEqual(ct, cipher.encrypt(self.data_128)) def test_nonce_must_be_bytes(self): self.assertRaises(TypeError, ChaCha20_Poly1305.new, key=self.key_256, nonce=u'test12345678') def test_nonce_length(self): # nonce can only be 8 or 12 bytes long self.assertRaises(ValueError, ChaCha20_Poly1305.new, key=self.key_256, nonce=b'0' * 7) self.assertRaises(ValueError, ChaCha20_Poly1305.new, key=self.key_256, nonce=b'') def test_block_size(self): # Not based on block ciphers cipher = ChaCha20_Poly1305.new(key=self.key_256, nonce=self.nonce_96) self.assertFalse(hasattr(cipher, 'block_size')) def test_nonce_attribute(self): cipher = ChaCha20_Poly1305.new(key=self.key_256, nonce=self.nonce_96) self.assertEqual(cipher.nonce, self.nonce_96) # By default, a 12 bytes long nonce is randomly generated nonce1 = ChaCha20_Poly1305.new(key=self.key_256).nonce nonce2 = ChaCha20_Poly1305.new(key=self.key_256).nonce self.assertEqual(len(nonce1), 12) self.assertNotEqual(nonce1, nonce2) def test_unknown_parameters(self): self.assertRaises(TypeError, ChaCha20_Poly1305.new, key=self.key_256, param=9) def test_null_encryption_decryption(self): for func in "encrypt", "decrypt": cipher = ChaCha20_Poly1305.new(key=self.key_256, nonce=self.nonce_96) result = getattr(cipher, func)(b"") self.assertEqual(result, b"") def test_either_encrypt_or_decrypt(self): cipher = ChaCha20_Poly1305.new(key=self.key_256, nonce=self.nonce_96) cipher.encrypt(b"") self.assertRaises(TypeError, cipher.decrypt, b"") cipher = ChaCha20_Poly1305.new(key=self.key_256, nonce=self.nonce_96) cipher.decrypt(b"") self.assertRaises(TypeError, cipher.encrypt, b"") def test_data_must_be_bytes(self): cipher = ChaCha20_Poly1305.new(key=self.key_256, nonce=self.nonce_96) self.assertRaises(TypeError, cipher.encrypt, u'test1234567890-*') cipher = ChaCha20_Poly1305.new(key=self.key_256, nonce=self.nonce_96) self.assertRaises(TypeError, cipher.decrypt, u'test1234567890-*') def test_mac_len(self): cipher = ChaCha20_Poly1305.new(key=self.key_256, nonce=self.nonce_96) _, mac = cipher.encrypt_and_digest(self.data_128) self.assertEqual(len(mac), 16) def test_invalid_mac(self): from Crypto.Util.strxor import strxor_c cipher = ChaCha20_Poly1305.new(key=self.key_256, nonce=self.nonce_96) ct, mac = cipher.encrypt_and_digest(self.data_128) invalid_mac = strxor_c(mac, 0x01) cipher = ChaCha20_Poly1305.new(key=self.key_256, nonce=self.nonce_96) self.assertRaises(ValueError, cipher.decrypt_and_verify, ct, invalid_mac) def test_hex_mac(self): cipher = ChaCha20_Poly1305.new(key=self.key_256, nonce=self.nonce_96) mac_hex = cipher.hexdigest() self.assertEqual(cipher.digest(), unhexlify(mac_hex)) cipher = ChaCha20_Poly1305.new(key=self.key_256, 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 = ChaCha20_Poly1305.new(key=self.key_256, 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 = ChaCha20_Poly1305.new(key=self.key_256, 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 = ChaCha20_Poly1305.new(key=self.key_256, 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_256) nonce_ba = bytearray(self.nonce_96) header_ba = bytearray(self.data_128) data_ba = bytearray(self.data_128) cipher1 = ChaCha20_Poly1305.new(key=self.key_256, nonce=self.nonce_96) cipher1.update(self.data_128) ct = cipher1.encrypt(self.data_128) tag = cipher1.digest() cipher2 = ChaCha20_Poly1305.new(key=self.key_256, nonce=self.nonce_96) 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'\x99\x99\x99' 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_256) nonce_ba = bytearray(self.nonce_96) header_ba = bytearray(self.data_128) ct_ba = bytearray(ct) tag_ba = bytearray(tag) del data_ba cipher3 = ChaCha20_Poly1305.new(key=self.key_256, nonce=self.nonce_96) key_ba[:3] = b'\xFF\xFF\xFF' nonce_ba[:3] = b'\xFF\xFF\xFF' cipher3.update(header_ba) header_ba[:3] = b'\xFF\xFF\xFF' pt_test = cipher3.decrypt(ct_ba) ct_ba[:3] = b'\xFF\xFF\xFF' cipher3.verify(tag_ba) self.assertEqual(pt_test, self.data_128) def test_memoryview(self): # Encrypt key_mv = memoryview(bytearray(self.key_256)) nonce_mv = memoryview(bytearray(self.nonce_96)) header_mv = memoryview(bytearray(self.data_128)) data_mv = memoryview(bytearray(self.data_128)) cipher1 = ChaCha20_Poly1305.new(key=self.key_256, nonce=self.nonce_96) cipher1.update(self.data_128) ct = cipher1.encrypt(self.data_128) tag = cipher1.digest() cipher2 = ChaCha20_Poly1305.new(key=self.key_256, nonce=self.nonce_96) 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'\x99\x99\x99' 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_256)) nonce_mv = memoryview(bytearray(self.nonce_96)) header_mv = memoryview(bytearray(self.data_128)) ct_mv = memoryview(bytearray(ct)) tag_mv = memoryview(bytearray(tag)) del data_mv cipher3 = ChaCha20_Poly1305.new(key=self.key_256, nonce=self.nonce_96) key_mv[:3] = b'\xFF\xFF\xFF' nonce_mv[:3] = b'\xFF\xFF\xFF' cipher3.update(header_mv) header_mv[:3] = b'\xFF\xFF\xFF' pt_test = cipher3.decrypt(ct_mv) ct_mv[:3] = b'\x99\x99\x99' cipher3.verify(tag_mv) self.assertEqual(pt_test, self.data_128) class XChaCha20Poly1305Tests(unittest.TestCase): def test_nonce(self): # Nonce can only be 24 bytes cipher = ChaCha20_Poly1305.new(key=b'Y' * 32, nonce=b'H' * 24) self.assertEqual(len(cipher.nonce), 24) self.assertEqual(cipher.nonce, b'H' * 24) def test_encrypt(self): # From https://tools.ietf.org/html/draft-arciszewski-xchacha-03 # Section A.3.1 pt = b""" 4c616469657320616e642047656e746c656d656e206f662074686520636c6173 73206f66202739393a204966204920636f756c64206f6666657220796f75206f 6e6c79206f6e652074697020666f7220746865206675747572652c2073756e73 637265656e20776f756c642062652069742e""" pt = unhexlify(pt.replace(b"\n", b"").replace(b" ", b"")) aad = unhexlify(b"50515253c0c1c2c3c4c5c6c7") key = unhexlify(b"808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9f") iv = unhexlify(b"404142434445464748494a4b4c4d4e4f5051525354555657") ct = b""" bd6d179d3e83d43b9576579493c0e939572a1700252bfaccbed2902c21396cbb 731c7f1b0b4aa6440bf3a82f4eda7e39ae64c6708c54c216cb96b72e1213b452 2f8c9ba40db5d945b11b69b982c1bb9e3f3fac2bc369488f76b2383565d3fff9 21f9664c97637da9768812f615c68b13b52e""" ct = unhexlify(ct.replace(b"\n", b"").replace(b" ", b"")) tag = unhexlify(b"c0875924c1c7987947deafd8780acf49") cipher = ChaCha20_Poly1305.new(key=key, nonce=iv) cipher.update(aad) ct_test, tag_test = cipher.encrypt_and_digest(pt) self.assertEqual(ct, ct_test) self.assertEqual(tag, tag_test) cipher = ChaCha20_Poly1305.new(key=key, nonce=iv) cipher.update(aad) cipher.decrypt_and_verify(ct, tag) class ChaCha20Poly1305FSMTests(unittest.TestCase): key_256 = get_tag_random("key_256", 32) nonce_96 = get_tag_random("nonce_96", 12) data_128 = get_tag_random("data_128", 16) def test_valid_init_encrypt_decrypt_digest_verify(self): # No authenticated data, fixed plaintext # Verify path INIT->ENCRYPT->DIGEST cipher = ChaCha20_Poly1305.new(key=self.key_256, nonce=self.nonce_96) ct = cipher.encrypt(self.data_128) mac = cipher.digest() # Verify path INIT->DECRYPT->VERIFY cipher = ChaCha20_Poly1305.new(key=self.key_256, 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 = ChaCha20_Poly1305.new(key=self.key_256, nonce=self.nonce_96) cipher.update(self.data_128) mac = cipher.digest() # Verify path INIT->UPDATE->VERIFY cipher = ChaCha20_Poly1305.new(key=self.key_256, nonce=self.nonce_96) cipher.update(self.data_128) cipher.verify(mac) def test_valid_full_path(self): # Fixed authenticated data, fixed plaintext # Verify path INIT->UPDATE->ENCRYPT->DIGEST cipher = ChaCha20_Poly1305.new(key=self.key_256, nonce=self.nonce_96) cipher.update(self.data_128) ct = cipher.encrypt(self.data_128) mac = cipher.digest() # Verify path INIT->UPDATE->DECRYPT->VERIFY cipher = ChaCha20_Poly1305.new(key=self.key_256, nonce=self.nonce_96) cipher.update(self.data_128) cipher.decrypt(ct) cipher.verify(mac) def test_valid_init_digest(self): # Verify path INIT->DIGEST cipher = ChaCha20_Poly1305.new(key=self.key_256, nonce=self.nonce_96) cipher.digest() def test_valid_init_verify(self): # Verify path INIT->VERIFY cipher = ChaCha20_Poly1305.new(key=self.key_256, nonce=self.nonce_96) mac = cipher.digest() cipher = ChaCha20_Poly1305.new(key=self.key_256, 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_128, self.data_128 + b"3"): cipher = ChaCha20_Poly1305.new(key=self.key_256, nonce=self.nonce_96) if auth_data is not None: cipher.update(auth_data) method = getattr(cipher, method_name) method(self.data_128) method(self.data_128) method(self.data_128) method(self.data_128) def test_valid_multiple_digest_or_verify(self): # Multiple calls to digest cipher = ChaCha20_Poly1305.new(key=self.key_256, nonce=self.nonce_96) cipher.update(self.data_128) first_mac = cipher.digest() for x in range(4): self.assertEqual(first_mac, cipher.digest()) # Multiple calls to verify cipher = ChaCha20_Poly1305.new(key=self.key_256, nonce=self.nonce_96) cipher.update(self.data_128) for x in range(5): cipher.verify(first_mac) def test_valid_encrypt_and_digest_decrypt_and_verify(self): # encrypt_and_digest cipher = ChaCha20_Poly1305.new(key=self.key_256, nonce=self.nonce_96) cipher.update(self.data_128) ct, mac = cipher.encrypt_and_digest(self.data_128) # decrypt_and_verify cipher = ChaCha20_Poly1305.new(key=self.key_256, nonce=self.nonce_96) cipher.update(self.data_128) pt = cipher.decrypt_and_verify(ct, mac) self.assertEqual(self.data_128, 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 = ChaCha20_Poly1305.new(key=self.key_256, nonce=self.nonce_96) if assoc_data_present: cipher.update(self.data_128) getattr(cipher, method1_name)(self.data_128) self.assertRaises(TypeError, getattr(cipher, method2_name), self.data_128) def test_invalid_encrypt_or_update_after_digest(self): for method_name in "encrypt", "update": cipher = ChaCha20_Poly1305.new(key=self.key_256, nonce=self.nonce_96) cipher.encrypt(self.data_128) cipher.digest() self.assertRaises(TypeError, getattr(cipher, method_name), self.data_128) cipher = ChaCha20_Poly1305.new(key=self.key_256, nonce=self.nonce_96) cipher.encrypt_and_digest(self.data_128) def test_invalid_decrypt_or_update_after_verify(self): cipher = ChaCha20_Poly1305.new(key=self.key_256, nonce=self.nonce_96) ct = cipher.encrypt(self.data_128) mac = cipher.digest() for method_name in "decrypt", "update": cipher = ChaCha20_Poly1305.new(key=self.key_256, nonce=self.nonce_96) cipher.decrypt(ct) cipher.verify(mac) self.assertRaises(TypeError, getattr(cipher, method_name), self.data_128) cipher = ChaCha20_Poly1305.new(key=self.key_256, nonce=self.nonce_96) cipher.decrypt(ct) cipher.verify(mac) self.assertRaises(TypeError, getattr(cipher, method_name), self.data_128) cipher = ChaCha20_Poly1305.new(key=self.key_256, nonce=self.nonce_96) cipher.decrypt_and_verify(ct, mac) self.assertRaises(TypeError, getattr(cipher, method_name), self.data_128) def compact(x): return unhexlify(x.replace(" ", "").replace(":", "")) class TestVectorsRFC(unittest.TestCase): """Test cases from RFC7539""" # AAD, PT, CT, MAC, KEY, NONCE test_vectors_hex = [ ( '50 51 52 53 c0 c1 c2 c3 c4 c5 c6 c7', '4c 61 64 69 65 73 20 61 6e 64 20 47 65 6e 74 6c' '65 6d 65 6e 20 6f 66 20 74 68 65 20 63 6c 61 73' '73 20 6f 66 20 27 39 39 3a 20 49 66 20 49 20 63' '6f 75 6c 64 20 6f 66 66 65 72 20 79 6f 75 20 6f' '6e 6c 79 20 6f 6e 65 20 74 69 70 20 66 6f 72 20' '74 68 65 20 66 75 74 75 72 65 2c 20 73 75 6e 73' '63 72 65 65 6e 20 77 6f 75 6c 64 20 62 65 20 69' '74 2e', 'd3 1a 8d 34 64 8e 60 db 7b 86 af bc 53 ef 7e c2' 'a4 ad ed 51 29 6e 08 fe a9 e2 b5 a7 36 ee 62 d6' '3d be a4 5e 8c a9 67 12 82 fa fb 69 da 92 72 8b' '1a 71 de 0a 9e 06 0b 29 05 d6 a5 b6 7e cd 3b 36' '92 dd bd 7f 2d 77 8b 8c 98 03 ae e3 28 09 1b 58' 'fa b3 24 e4 fa d6 75 94 55 85 80 8b 48 31 d7 bc' '3f f4 de f0 8e 4b 7a 9d e5 76 d2 65 86 ce c6 4b' '61 16', '1a:e1:0b:59:4f:09:e2:6a:7e:90:2e:cb:d0:60:06:91', '80 81 82 83 84 85 86 87 88 89 8a 8b 8c 8d 8e 8f' '90 91 92 93 94 95 96 97 98 99 9a 9b 9c 9d 9e 9f', '07 00 00 00' + '40 41 42 43 44 45 46 47', ), ( 'f3 33 88 86 00 00 00 00 00 00 4e 91', '49 6e 74 65 72 6e 65 74 2d 44 72 61 66 74 73 20' '61 72 65 20 64 72 61 66 74 20 64 6f 63 75 6d 65' '6e 74 73 20 76 61 6c 69 64 20 66 6f 72 20 61 20' '6d 61 78 69 6d 75 6d 20 6f 66 20 73 69 78 20 6d' '6f 6e 74 68 73 20 61 6e 64 20 6d 61 79 20 62 65' '20 75 70 64 61 74 65 64 2c 20 72 65 70 6c 61 63' '65 64 2c 20 6f 72 20 6f 62 73 6f 6c 65 74 65 64' '20 62 79 20 6f 74 68 65 72 20 64 6f 63 75 6d 65' '6e 74 73 20 61 74 20 61 6e 79 20 74 69 6d 65 2e' '20 49 74 20 69 73 20 69 6e 61 70 70 72 6f 70 72' '69 61 74 65 20 74 6f 20 75 73 65 20 49 6e 74 65' '72 6e 65 74 2d 44 72 61 66 74 73 20 61 73 20 72' '65 66 65 72 65 6e 63 65 20 6d 61 74 65 72 69 61' '6c 20 6f 72 20 74 6f 20 63 69 74 65 20 74 68 65' '6d 20 6f 74 68 65 72 20 74 68 61 6e 20 61 73 20' '2f e2 80 9c 77 6f 72 6b 20 69 6e 20 70 72 6f 67' '72 65 73 73 2e 2f e2 80 9d', '64 a0 86 15 75 86 1a f4 60 f0 62 c7 9b e6 43 bd' '5e 80 5c fd 34 5c f3 89 f1 08 67 0a c7 6c 8c b2' '4c 6c fc 18 75 5d 43 ee a0 9e e9 4e 38 2d 26 b0' 'bd b7 b7 3c 32 1b 01 00 d4 f0 3b 7f 35 58 94 cf' '33 2f 83 0e 71 0b 97 ce 98 c8 a8 4a bd 0b 94 81' '14 ad 17 6e 00 8d 33 bd 60 f9 82 b1 ff 37 c8 55' '97 97 a0 6e f4 f0 ef 61 c1 86 32 4e 2b 35 06 38' '36 06 90 7b 6a 7c 02 b0 f9 f6 15 7b 53 c8 67 e4' 'b9 16 6c 76 7b 80 4d 46 a5 9b 52 16 cd e7 a4 e9' '90 40 c5 a4 04 33 22 5e e2 82 a1 b0 a0 6c 52 3e' 'af 45 34 d7 f8 3f a1 15 5b 00 47 71 8c bc 54 6a' '0d 07 2b 04 b3 56 4e ea 1b 42 22 73 f5 48 27 1a' '0b b2 31 60 53 fa 76 99 19 55 eb d6 31 59 43 4e' 'ce bb 4e 46 6d ae 5a 10 73 a6 72 76 27 09 7a 10' '49 e6 17 d9 1d 36 10 94 fa 68 f0 ff 77 98 71 30' '30 5b ea ba 2e da 04 df 99 7b 71 4d 6c 6f 2c 29' 'a6 ad 5c b4 02 2b 02 70 9b', 'ee ad 9d 67 89 0c bb 22 39 23 36 fe a1 85 1f 38', '1c 92 40 a5 eb 55 d3 8a f3 33 88 86 04 f6 b5 f0' '47 39 17 c1 40 2b 80 09 9d ca 5c bc 20 70 75 c0', '00 00 00 00 01 02 03 04 05 06 07 08', ) ] test_vectors = [[unhexlify(x.replace(" ", "").replace(":", "")) 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 = ChaCha20_Poly1305.new(key=key, nonce=nonce) cipher.update(assoc_data) ct2, mac2 = cipher.encrypt_and_digest(pt) self.assertEqual(ct, ct2) self.assertEqual(mac, mac2) # Decrypt cipher = ChaCha20_Poly1305.new(key=key, nonce=nonce) cipher.update(assoc_data) pt2 = cipher.decrypt_and_verify(ct, mac) self.assertEqual(pt, pt2) class TestVectorsWycheproof(unittest.TestCase): def __init__(self, wycheproof_warnings): unittest.TestCase.__init__(self) self._wycheproof_warnings = wycheproof_warnings self._id = "None" def load_tests(self, filename): def filter_tag(group): return group['tagSize'] // 8 def filter_algo(root): return root['algorithm'] result = load_test_vectors_wycheproof(("Cipher", "wycheproof"), filename, "Wycheproof ChaCha20-Poly1305", root_tag={'algo': filter_algo}, group_tag={'tag_size': filter_tag}) return result def setUp(self): self.tv = [] self.tv.extend(self.load_tests("chacha20_poly1305_test.json")) self.tv.extend(self.load_tests("xchacha20_poly1305_test.json")) 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 %s Test #%s" % (tv.algo, tv.id) try: cipher = ChaCha20_Poly1305.new(key=tv.key, nonce=tv.iv) except ValueError as e: assert len(tv.iv) not in (8, 12) and "Nonce must be" in str(e) return 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 %s Test #%s" % (tv.algo, tv.id) try: cipher = ChaCha20_Poly1305.new(key=tv.key, nonce=tv.iv) except ValueError as e: assert len(tv.iv) not in (8, 12) and "Nonce must be" in str(e) return 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 ChaCha20-Poly1305 Test #" + str(tv.id) if len(tv.iv) == 0 or len(tv.ct) < 1: return cipher = ChaCha20_Poly1305.new(key=tv.key, nonce=tv.iv) 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 TestOutput(unittest.TestCase): def runTest(self): # Encrypt/Decrypt data and test output parameter key = b'4' * 32 nonce = b'5' * 12 cipher = ChaCha20_Poly1305.new(key=key, nonce=nonce) pt = b'5' * 16 ct = cipher.encrypt(pt) output = bytearray(16) cipher = ChaCha20_Poly1305.new(key=key, nonce=nonce) res = cipher.encrypt(pt, output=output) self.assertEqual(ct, output) self.assertEqual(res, None) cipher = ChaCha20_Poly1305.new(key=key, nonce=nonce) res = cipher.decrypt(ct, output=output) self.assertEqual(pt, output) self.assertEqual(res, None) output = memoryview(bytearray(16)) cipher = ChaCha20_Poly1305.new(key=key, nonce=nonce) cipher.encrypt(pt, output=output) self.assertEqual(ct, output) cipher = ChaCha20_Poly1305.new(key=key, nonce=nonce) cipher.decrypt(ct, output=output) self.assertEqual(pt, output) cipher = ChaCha20_Poly1305.new(key=key, nonce=nonce) self.assertRaises(TypeError, cipher.encrypt, pt, output=b'0'*16) cipher = ChaCha20_Poly1305.new(key=key, nonce=nonce) self.assertRaises(TypeError, cipher.decrypt, ct, output=b'0'*16) shorter_output = bytearray(7) cipher = ChaCha20_Poly1305.new(key=key, nonce=nonce) self.assertRaises(ValueError, cipher.encrypt, pt, output=shorter_output) cipher = ChaCha20_Poly1305.new(key=key, nonce=nonce) self.assertRaises(ValueError, cipher.decrypt, ct, output=shorter_output) def get_tests(config={}): wycheproof_warnings = config.get('wycheproof_warnings') tests = [] tests += list_test_cases(ChaCha20Poly1305Tests) tests += list_test_cases(XChaCha20Poly1305Tests) tests += list_test_cases(ChaCha20Poly1305FSMTests) tests += [TestVectorsRFC()] tests += [TestVectorsWycheproof(wycheproof_warnings)] tests += [TestOutput()] return tests if __name__ == '__main__': def suite(): unittest.TestSuite(get_tests()) unittest.main(defaultTest='suite')
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