/* * Copyright (C) 2015 Southern Storm Software, Pty Ltd. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included * in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER * DEALINGS IN THE SOFTWARE. */ /* This example runs tests on the GHASH implementation to verify correct behaviour. */ #include #include #include // Test vectors from Appendix B of: // http://csrc.nist.gov/groups/ST/toolkit/BCM/documents/proposedmodes/gcm/gcm-revised-spec.pdf struct TestVector { const char *name; uint8_t key[16]; uint8_t data[112]; size_t dataLen; uint8_t hash[16]; }; static TestVector const testVectorGHASH_1 = { .name = "GHASH #1", .key = {0x66, 0xe9, 0x4b, 0xd4, 0xef, 0x8a, 0x2c, 0x3b, 0x88, 0x4c, 0xfa, 0x59, 0xca, 0x34, 0x2b, 0x2e}, .data = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, .dataLen = 16, .hash = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00} }; static TestVector const testVectorGHASH_2 = { .name = "GHASH #2", .key = {0x66, 0xe9, 0x4b, 0xd4, 0xef, 0x8a, 0x2c, 0x3b, 0x88, 0x4c, 0xfa, 0x59, 0xca, 0x34, 0x2b, 0x2e}, .data = {0x03, 0x88, 0xda, 0xce, 0x60, 0xb6, 0xa3, 0x92, 0xf3, 0x28, 0xc2, 0xb9, 0x71, 0xb2, 0xfe, 0x78, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80}, .dataLen = 32, .hash = {0xf3, 0x8c, 0xbb, 0x1a, 0xd6, 0x92, 0x23, 0xdc, 0xc3, 0x45, 0x7a, 0xe5, 0xb6, 0xb0, 0xf8, 0x85} }; static TestVector const testVectorGHASH_3 = { .name = "GHASH #3", .key = {0xb8, 0x3b, 0x53, 0x37, 0x08, 0xbf, 0x53, 0x5d, 0x0a, 0xa6, 0xe5, 0x29, 0x80, 0xd5, 0x3b, 0x78}, .data = {0x42, 0x83, 0x1e, 0xc2, 0x21, 0x77, 0x74, 0x24, 0x4b, 0x72, 0x21, 0xb7, 0x84, 0xd0, 0xd4, 0x9c, 0xe3, 0xaa, 0x21, 0x2f, 0x2c, 0x02, 0xa4, 0xe0, 0x35, 0xc1, 0x7e, 0x23, 0x29, 0xac, 0xa1, 0x2e, 0x21, 0xd5, 0x14, 0xb2, 0x54, 0x66, 0x93, 0x1c, 0x7d, 0x8f, 0x6a, 0x5a, 0xac, 0x84, 0xaa, 0x05, 0x1b, 0xa3, 0x0b, 0x39, 0x6a, 0x0a, 0xac, 0x97, 0x3d, 0x58, 0xe0, 0x91, 0x47, 0x3f, 0x59, 0x85, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00}, .dataLen = 80, .hash = {0x7f, 0x1b, 0x32, 0xb8, 0x1b, 0x82, 0x0d, 0x02, 0x61, 0x4f, 0x88, 0x95, 0xac, 0x1d, 0x4e, 0xac} }; static TestVector const testVectorGHASH_4 = { .name = "GHASH #4", .key = {0xb8, 0x3b, 0x53, 0x37, 0x08, 0xbf, 0x53, 0x5d, 0x0a, 0xa6, 0xe5, 0x29, 0x80, 0xd5, 0x3b, 0x78}, .data = {0xfe, 0xed, 0xfa, 0xce, 0xde, 0xad, 0xbe, 0xef, 0xfe, 0xed, 0xfa, 0xce, 0xde, 0xad, 0xbe, 0xef, 0xab, 0xad, 0xda, 0xd2, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x42, 0x83, 0x1e, 0xc2, 0x21, 0x77, 0x74, 0x24, 0x4b, 0x72, 0x21, 0xb7, 0x84, 0xd0, 0xd4, 0x9c, 0xe3, 0xaa, 0x21, 0x2f, 0x2c, 0x02, 0xa4, 0xe0, 0x35, 0xc1, 0x7e, 0x23, 0x29, 0xac, 0xa1, 0x2e, 0x21, 0xd5, 0x14, 0xb2, 0x54, 0x66, 0x93, 0x1c, 0x7d, 0x8f, 0x6a, 0x5a, 0xac, 0x84, 0xaa, 0x05, 0x1b, 0xa3, 0x0b, 0x39, 0x6a, 0x0a, 0xac, 0x97, 0x3d, 0x58, 0xe0, 0x91, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xa0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0xe0}, .dataLen = 112, .hash = {0x69, 0x8e, 0x57, 0xf7, 0x0e, 0x6e, 0xcc, 0x7f, 0xd9, 0x46, 0x3b, 0x72, 0x60, 0xa9, 0xae, 0x5f} }; GHASH ghash; byte buffer[128]; bool testGHASH_N(GHASH *hash, const struct TestVector *test, size_t inc) { size_t size = test->dataLen; size_t posn, len; hash->reset(test->key); for (posn = 0; posn < size; posn += inc) { len = size - posn; if (len > inc) len = inc; hash->update(test->data + posn, len); } hash->finalize(buffer, 16); return !memcmp(buffer, test->hash, 16); } void testGHASH(GHASH *hash, const struct TestVector *test) { bool ok; Serial.print(test->name); Serial.print(" ... "); ok = testGHASH_N(hash, test, test->dataLen); ok &= testGHASH_N(hash, test, 1); ok &= testGHASH_N(hash, test, 2); ok &= testGHASH_N(hash, test, 5); ok &= testGHASH_N(hash, test, 8); ok &= testGHASH_N(hash, test, 13); ok &= testGHASH_N(hash, test, 16); ok &= testGHASH_N(hash, test, 24); ok &= testGHASH_N(hash, test, 63); ok &= testGHASH_N(hash, test, 64); if (ok) Serial.println("Passed"); else Serial.println("Failed"); } void perfGHASH(GHASH *hash) { unsigned long start; unsigned long elapsed; int count; Serial.print("Hashing ... "); for (size_t posn = 0; posn < sizeof(buffer); ++posn) buffer[posn] = (uint8_t)posn; hash->reset(testVectorGHASH_1.key); start = micros(); for (count = 0; count < 200; ++count) { hash->update(buffer, sizeof(buffer)); } elapsed = micros() - start; Serial.print(elapsed / (sizeof(buffer) * 200.0)); Serial.print("us per byte, "); Serial.print((sizeof(buffer) * 200.0 * 1000000.0) / elapsed); Serial.println(" bytes per second"); } void setup() { Serial.begin(9600); Serial.println(); Serial.print("State Size ... "); Serial.println(sizeof(GHASH)); Serial.println(); Serial.println("Test Vectors:"); testGHASH(&ghash, &testVectorGHASH_1); testGHASH(&ghash, &testVectorGHASH_2); testGHASH(&ghash, &testVectorGHASH_3); testGHASH(&ghash, &testVectorGHASH_4); Serial.println(); Serial.println("Performance Tests:"); perfGHASH(&ghash); } void loop() { }