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Editing: test_ChaCha20.py
# =================================================================== # # Copyright (c) 2014, 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 os import re import unittest from binascii import hexlify, unhexlify from Crypto.Util.py3compat import b, tobytes, bchr from Crypto.Util.strxor import strxor_c from Crypto.SelfTest.st_common import list_test_cases from Crypto.Cipher import ChaCha20 class ChaCha20Test(unittest.TestCase): def test_new_positive(self): cipher = ChaCha20.new(key=b("0")*32, nonce=b"0"*8) self.assertEqual(cipher.nonce, b"0" * 8) cipher = ChaCha20.new(key=b("0")*32, nonce=b"0"*12) self.assertEqual(cipher.nonce, b"0" * 12) def test_new_negative(self): new = ChaCha20.new self.assertRaises(TypeError, new) self.assertRaises(TypeError, new, nonce=b("0")) self.assertRaises(ValueError, new, nonce=b("0")*8, key=b("0")) self.assertRaises(ValueError, new, nonce=b("0"), key=b("0")*32) def test_default_nonce(self): cipher1 = ChaCha20.new(key=bchr(1) * 32) cipher2 = ChaCha20.new(key=bchr(1) * 32) self.assertEqual(len(cipher1.nonce), 8) self.assertNotEqual(cipher1.nonce, cipher2.nonce) def test_nonce(self): key = b'A' * 32 nonce1 = b'P' * 8 cipher1 = ChaCha20.new(key=key, nonce=nonce1) self.assertEqual(nonce1, cipher1.nonce) nonce2 = b'Q' * 12 cipher2 = ChaCha20.new(key=key, nonce=nonce2) self.assertEqual(nonce2, cipher2.nonce) def test_eiter_encrypt_or_decrypt(self): """Verify that a cipher cannot be used for both decrypting and encrypting""" c1 = ChaCha20.new(key=b("5") * 32, nonce=b("6") * 8) c1.encrypt(b("8")) self.assertRaises(TypeError, c1.decrypt, b("9")) c2 = ChaCha20.new(key=b("5") * 32, nonce=b("6") * 8) c2.decrypt(b("8")) self.assertRaises(TypeError, c2.encrypt, b("9")) def test_round_trip(self): pt = b("A") * 1024 c1 = ChaCha20.new(key=b("5") * 32, nonce=b("6") * 8) c2 = ChaCha20.new(key=b("5") * 32, nonce=b("6") * 8) ct = c1.encrypt(pt) self.assertEqual(c2.decrypt(ct), pt) self.assertEqual(c1.encrypt(b("")), b("")) self.assertEqual(c2.decrypt(b("")), b("")) def test_streaming(self): """Verify that an arbitrary number of bytes can be encrypted/decrypted""" from Crypto.Hash import SHA1 segments = (1, 3, 5, 7, 11, 17, 23) total = sum(segments) pt = b("") while len(pt) < total: pt += SHA1.new(pt).digest() cipher1 = ChaCha20.new(key=b("7") * 32, nonce=b("t") * 8) ct = cipher1.encrypt(pt) cipher2 = ChaCha20.new(key=b("7") * 32, nonce=b("t") * 8) cipher3 = ChaCha20.new(key=b("7") * 32, nonce=b("t") * 8) idx = 0 for segment in segments: self.assertEqual(cipher2.decrypt(ct[idx:idx+segment]), pt[idx:idx+segment]) self.assertEqual(cipher3.encrypt(pt[idx:idx+segment]), ct[idx:idx+segment]) idx += segment def test_seek(self): cipher1 = ChaCha20.new(key=b("9") * 32, nonce=b("e") * 8) offset = 64 * 900 + 7 pt = b("1") * 64 cipher1.encrypt(b("0") * offset) ct1 = cipher1.encrypt(pt) cipher2 = ChaCha20.new(key=b("9") * 32, nonce=b("e") * 8) cipher2.seek(offset) ct2 = cipher2.encrypt(pt) self.assertEqual(ct1, ct2) def test_seek_tv(self): # Test Vector #4, A.1 from # http://tools.ietf.org/html/draft-nir-cfrg-chacha20-poly1305-04 key = bchr(0) + bchr(255) + bchr(0) * 30 nonce = bchr(0) * 8 cipher = ChaCha20.new(key=key, nonce=nonce) cipher.seek(64 * 2) expected_key_stream = unhexlify(b( "72d54dfbf12ec44b362692df94137f32" "8fea8da73990265ec1bbbea1ae9af0ca" "13b25aa26cb4a648cb9b9d1be65b2c09" "24a66c54d545ec1b7374f4872e99f096" )) ct = cipher.encrypt(bchr(0) * len(expected_key_stream)) self.assertEqual(expected_key_stream, ct) def test_rfc7539(self): # from https://tools.ietf.org/html/rfc7539 Annex A.1 # Each item is: key, nonce, block #, plaintext, ciphertext tvs = [ # Test Vector #1 ( "00"*32, "00"*12, 0, "00"*16*4, "76b8e0ada0f13d90405d6ae55386bd28" "bdd219b8a08ded1aa836efcc8b770dc7" "da41597c5157488d7724e03fb8d84a37" "6a43b8f41518a11cc387b669b2ee6586" ), # Test Vector #2 ( "00"*31 + "01", "00"*11 + "02", 1, "416e79207375626d697373696f6e2074" "6f20746865204945544620696e74656e" "6465642062792074686520436f6e7472" "696275746f7220666f72207075626c69" "636174696f6e20617320616c6c206f72" "2070617274206f6620616e2049455446" "20496e7465726e65742d447261667420" "6f722052464320616e6420616e792073" "746174656d656e74206d616465207769" "7468696e2074686520636f6e74657874" "206f6620616e20494554462061637469" "7669747920697320636f6e7369646572" "656420616e20224945544620436f6e74" "7269627574696f6e222e205375636820" "73746174656d656e747320696e636c75" "6465206f72616c2073746174656d656e" "747320696e2049455446207365737369" "6f6e732c2061732077656c6c20617320" "7772697474656e20616e6420656c6563" "74726f6e696320636f6d6d756e696361" "74696f6e73206d61646520617420616e" "792074696d65206f7220706c6163652c" "20776869636820617265206164647265" "7373656420746f", "a3fbf07df3fa2fde4f376ca23e827370" "41605d9f4f4f57bd8cff2c1d4b7955ec" "2a97948bd3722915c8f3d337f7d37005" "0e9e96d647b7c39f56e031ca5eb6250d" "4042e02785ececfa4b4bb5e8ead0440e" "20b6e8db09d881a7c6132f420e527950" "42bdfa7773d8a9051447b3291ce1411c" "680465552aa6c405b7764d5e87bea85a" "d00f8449ed8f72d0d662ab052691ca66" "424bc86d2df80ea41f43abf937d3259d" "c4b2d0dfb48a6c9139ddd7f76966e928" "e635553ba76c5c879d7b35d49eb2e62b" "0871cdac638939e25e8a1e0ef9d5280f" "a8ca328b351c3c765989cbcf3daa8b6c" "cc3aaf9f3979c92b3720fc88dc95ed84" "a1be059c6499b9fda236e7e818b04b0b" "c39c1e876b193bfe5569753f88128cc0" "8aaa9b63d1a16f80ef2554d7189c411f" "5869ca52c5b83fa36ff216b9c1d30062" "bebcfd2dc5bce0911934fda79a86f6e6" "98ced759c3ff9b6477338f3da4f9cd85" "14ea9982ccafb341b2384dd902f3d1ab" "7ac61dd29c6f21ba5b862f3730e37cfd" "c4fd806c22f221" ), # Test Vector #3 ( "1c9240a5eb55d38af333888604f6b5f0" "473917c1402b80099dca5cbc207075c0", "00"*11 + "02", 42, "2754776173206272696c6c69672c2061" "6e642074686520736c6974687920746f" "7665730a446964206779726520616e64" "2067696d626c6520696e207468652077" "6162653a0a416c6c206d696d73792077" "6572652074686520626f726f676f7665" "732c0a416e6420746865206d6f6d6520" "7261746873206f757467726162652e", "62e6347f95ed87a45ffae7426f27a1df" "5fb69110044c0d73118effa95b01e5cf" "166d3df2d721caf9b21e5fb14c616871" "fd84c54f9d65b283196c7fe4f60553eb" "f39c6402c42234e32a356b3e764312a6" "1a5532055716ead6962568f87d3f3f77" "04c6a8d1bcd1bf4d50d6154b6da731b1" "87b58dfd728afa36757a797ac188d1" ) ] for tv in tvs: key = unhexlify(tv[0]) nonce = unhexlify(tv[1]) offset = tv[2] * 64 pt = unhexlify(tv[3]) ct_expect = unhexlify(tv[4]) cipher = ChaCha20.new(key=key, nonce=nonce) if offset != 0: cipher.seek(offset) ct = cipher.encrypt(pt) assert(ct == ct_expect) class XChaCha20Test(unittest.TestCase): # From https://tools.ietf.org/html/draft-arciszewski-xchacha-03 def test_hchacha20(self): # Section 2.2.1 from Crypto.Cipher.ChaCha20 import _HChaCha20 key = b"00:01:02:03:04:05:06:07:08:09:0a:0b:0c:0d:0e:0f:10:11:12:13:14:15:16:17:18:19:1a:1b:1c:1d:1e:1f" key = unhexlify(key.replace(b":", b"")) nonce = b"00:00:00:09:00:00:00:4a:00:00:00:00:31:41:59:27" nonce = unhexlify(nonce.replace(b":", b"")) subkey = _HChaCha20(key, nonce) expected = b"82413b42 27b27bfe d30e4250 8a877d73 a0f9e4d5 8a74a853 c12ec413 26d3ecdc" expected = unhexlify(expected.replace(b" ", b"")) self.assertEqual(subkey, expected) def test_nonce(self): key = b'A' * 32 nonce = b'P' * 24 cipher = ChaCha20.new(key=key, nonce=nonce) self.assertEqual(nonce, cipher.nonce) def test_encrypt(self): # Section A.3.2 pt = b""" 5468652064686f6c65202870726f6e6f756e6365642022646f6c652229206973 20616c736f206b6e6f776e2061732074686520417369617469632077696c6420 646f672c2072656420646f672c20616e642077686973746c696e6720646f672e 2049742069732061626f7574207468652073697a65206f662061204765726d61 6e20736865706865726420627574206c6f6f6b73206d6f7265206c696b652061 206c6f6e672d6c656767656420666f782e205468697320686967686c7920656c 757369766520616e6420736b696c6c6564206a756d70657220697320636c6173 736966696564207769746820776f6c7665732c20636f796f7465732c206a6163 6b616c732c20616e6420666f78657320696e20746865207461786f6e6f6d6963 2066616d696c792043616e696461652e""" pt = unhexlify(pt.replace(b"\n", b"").replace(b" ", b"")) key = unhexlify(b"808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9f") iv = unhexlify(b"404142434445464748494a4b4c4d4e4f5051525354555658") ct = b""" 7d0a2e6b7f7c65a236542630294e063b7ab9b555a5d5149aa21e4ae1e4fbce87 ecc8e08a8b5e350abe622b2ffa617b202cfad72032a3037e76ffdcdc4376ee05 3a190d7e46ca1de04144850381b9cb29f051915386b8a710b8ac4d027b8b050f 7cba5854e028d564e453b8a968824173fc16488b8970cac828f11ae53cabd201 12f87107df24ee6183d2274fe4c8b1485534ef2c5fbc1ec24bfc3663efaa08bc 047d29d25043532db8391a8a3d776bf4372a6955827ccb0cdd4af403a7ce4c63 d595c75a43e045f0cce1f29c8b93bd65afc5974922f214a40b7c402cdb91ae73 c0b63615cdad0480680f16515a7ace9d39236464328a37743ffc28f4ddb324f4 d0f5bbdc270c65b1749a6efff1fbaa09536175ccd29fb9e6057b307320d31683 8a9c71f70b5b5907a66f7ea49aadc409""" ct = unhexlify(ct.replace(b"\n", b"").replace(b" ", b"")) cipher = ChaCha20.new(key=key, nonce=iv) cipher.seek(64) # Counter = 1 ct_test = cipher.encrypt(pt) self.assertEqual(ct, ct_test) class ByteArrayTest(unittest.TestCase): """Verify we can encrypt or decrypt bytearrays""" def runTest(self): data = b"0123" key = b"9" * 32 nonce = b"t" * 8 # Encryption data_ba = bytearray(data) key_ba = bytearray(key) nonce_ba = bytearray(nonce) cipher1 = ChaCha20.new(key=key, nonce=nonce) ct = cipher1.encrypt(data) cipher2 = ChaCha20.new(key=key_ba, nonce=nonce_ba) key_ba[:1] = b'\xFF' nonce_ba[:1] = b'\xFF' ct_test = cipher2.encrypt(data_ba) self.assertEqual(ct, ct_test) self.assertEqual(cipher1.nonce, cipher2.nonce) # Decryption key_ba = bytearray(key) nonce_ba = bytearray(nonce) ct_ba = bytearray(ct) cipher3 = ChaCha20.new(key=key_ba, nonce=nonce_ba) key_ba[:1] = b'\xFF' nonce_ba[:1] = b'\xFF' pt_test = cipher3.decrypt(ct_ba) self.assertEqual(data, pt_test) class MemoryviewTest(unittest.TestCase): """Verify we can encrypt or decrypt bytearrays""" def runTest(self): data = b"0123" key = b"9" * 32 nonce = b"t" * 8 # Encryption data_mv = memoryview(bytearray(data)) key_mv = memoryview(bytearray(key)) nonce_mv = memoryview(bytearray(nonce)) cipher1 = ChaCha20.new(key=key, nonce=nonce) ct = cipher1.encrypt(data) cipher2 = ChaCha20.new(key=key_mv, nonce=nonce_mv) key_mv[:1] = b'\xFF' nonce_mv[:1] = b'\xFF' ct_test = cipher2.encrypt(data_mv) self.assertEqual(ct, ct_test) self.assertEqual(cipher1.nonce, cipher2.nonce) # Decryption key_mv = memoryview(bytearray(key)) nonce_mv = memoryview(bytearray(nonce)) ct_mv = memoryview(bytearray(ct)) cipher3 = ChaCha20.new(key=key_mv, nonce=nonce_mv) key_mv[:1] = b'\xFF' nonce_mv[:1] = b'\xFF' pt_test = cipher3.decrypt(ct_mv) self.assertEqual(data, pt_test) class ChaCha20_AGL_NIR(unittest.TestCase): # From http://tools.ietf.org/html/draft-agl-tls-chacha20poly1305-04 # and http://tools.ietf.org/html/draft-nir-cfrg-chacha20-poly1305-04 tv = [ ( "00" * 32, "00" * 8, "76b8e0ada0f13d90405d6ae55386bd28bdd219b8a08ded1aa836efcc" "8b770dc7da41597c5157488d7724e03fb8d84a376a43b8f41518a11c" "c387b669b2ee6586" "9f07e7be5551387a98ba977c732d080d" "cb0f29a048e3656912c6533e32ee7aed" "29b721769ce64e43d57133b074d839d5" "31ed1f28510afb45ace10a1f4b794d6f" ), ( "00" * 31 + "01", "00" * 8, "4540f05a9f1fb296d7736e7b208e3c96eb4fe1834688d2604f450952" "ed432d41bbe2a0b6ea7566d2a5d1e7e20d42af2c53d792b1c43fea81" "7e9ad275ae546963" "3aeb5224ecf849929b9d828db1ced4dd" "832025e8018b8160b82284f3c949aa5a" "8eca00bbb4a73bdad192b5c42f73f2fd" "4e273644c8b36125a64addeb006c13a0" ), ( "00" * 32, "00" * 7 + "01", "de9cba7bf3d69ef5e786dc63973f653a0b49e015adbff7134fcb7df1" "37821031e85a050278a7084527214f73efc7fa5b5277062eb7a0433e" "445f41e3" ), ( "00" * 32, "01" + "00" * 7, "ef3fdfd6c61578fbf5cf35bd3dd33b8009631634d21e42ac33960bd1" "38e50d32111e4caf237ee53ca8ad6426194a88545ddc497a0b466e7d" "6bbdb0041b2f586b" ), ( "000102030405060708090a0b0c0d0e0f101112131415161718191a1b" "1c1d1e1f", "0001020304050607", "f798a189f195e66982105ffb640bb7757f579da31602fc93ec01ac56" "f85ac3c134a4547b733b46413042c9440049176905d3be59ea1c53f1" "5916155c2be8241a38008b9a26bc35941e2444177c8ade6689de9526" "4986d95889fb60e84629c9bd9a5acb1cc118be563eb9b3a4a472f82e" "09a7e778492b562ef7130e88dfe031c79db9d4f7c7a899151b9a4750" "32b63fc385245fe054e3dd5a97a5f576fe064025d3ce042c566ab2c5" "07b138db853e3d6959660996546cc9c4a6eafdc777c040d70eaf46f7" "6dad3979e5c5360c3317166a1c894c94a371876a94df7628fe4eaaf2" "ccb27d5aaae0ad7ad0f9d4b6ad3b54098746d4524d38407a6deb3ab7" "8fab78c9" ), ( "00" * 32, "00" * 7 + "02", "c2c64d378cd536374ae204b9ef933fcd" "1a8b2288b3dfa49672ab765b54ee27c7" "8a970e0e955c14f3a88e741b97c286f7" "5f8fc299e8148362fa198a39531bed6d" ), ] def runTest(self): for (key, nonce, stream) in self.tv: c = ChaCha20.new(key=unhexlify(b(key)), nonce=unhexlify(b(nonce))) ct = unhexlify(b(stream)) pt = b("\x00") * len(ct) self.assertEqual(c.encrypt(pt), ct) class TestOutput(unittest.TestCase): def runTest(self): # Encrypt/Decrypt data and test output parameter key = b'4' * 32 nonce = b'5' * 8 cipher = ChaCha20.new(key=key, nonce=nonce) pt = b'5' * 300 ct = cipher.encrypt(pt) output = bytearray(len(pt)) cipher = ChaCha20.new(key=key, nonce=nonce) res = cipher.encrypt(pt, output=output) self.assertEqual(ct, output) self.assertEqual(res, None) cipher = ChaCha20.new(key=key, nonce=nonce) res = cipher.decrypt(ct, output=output) self.assertEqual(pt, output) self.assertEqual(res, None) output = memoryview(bytearray(len(pt))) cipher = ChaCha20.new(key=key, nonce=nonce) cipher.encrypt(pt, output=output) self.assertEqual(ct, output) cipher = ChaCha20.new(key=key, nonce=nonce) cipher.decrypt(ct, output=output) self.assertEqual(pt, output) cipher = ChaCha20.new(key=key, nonce=nonce) self.assertRaises(TypeError, cipher.encrypt, pt, output=b'0'*len(pt)) cipher = ChaCha20.new(key=key, nonce=nonce) self.assertRaises(TypeError, cipher.decrypt, ct, output=b'0'*len(pt)) shorter_output = bytearray(len(pt) - 1) cipher = ChaCha20.new(key=key, nonce=nonce) self.assertRaises(ValueError, cipher.encrypt, pt, output=shorter_output) cipher = ChaCha20.new(key=key, nonce=nonce) self.assertRaises(ValueError, cipher.decrypt, ct, output=shorter_output) def get_tests(config={}): tests = [] tests += list_test_cases(ChaCha20Test) tests += list_test_cases(XChaCha20Test) tests.append(ChaCha20_AGL_NIR()) tests.append(ByteArrayTest()) tests.append(MemoryviewTest()) tests.append(TestOutput()) return tests if __name__ == '__main__': import unittest suite = lambda: unittest.TestSuite(get_tests()) unittest.main(defaultTest='suite')
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