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)
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_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_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_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_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_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_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 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)
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)