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| /*
| * 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 <Crypto.h>
| #include <GHASH.h>
| #include <string.h>
|
| // 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 perfGHASHSetKey(GHASH *hash)
| {
| unsigned long start;
| unsigned long elapsed;
| int count;
|
| Serial.print("Set Key ... ");
|
| start = micros();
| for (count = 0; count < 1000; ++count) {
| hash->reset(testVectorGHASH_1.key);
| }
| elapsed = micros() - start;
|
| Serial.print(elapsed / 1000.0);
| Serial.print("us per op, ");
| Serial.print((1000.0 * 1000000.0) / elapsed);
| Serial.println(" ops per second");
| }
|
| void perfGHASHFinalize(GHASH *hash)
| {
| unsigned long start;
| unsigned long elapsed;
| int count;
|
| Serial.print("Finalize ... ");
|
| hash->reset(testVectorGHASH_1.key);
| hash->update("abc", 3);
| start = micros();
| for (count = 0; count < 1000; ++count) {
| hash->finalize(buffer, 16);
| }
| elapsed = micros() - start;
|
| Serial.print(elapsed / 1000.0);
| Serial.print("us per op, ");
| Serial.print((1000.0 * 1000000.0) / elapsed);
| Serial.println(" ops 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);
| perfGHASHSetKey(&ghash);
| perfGHASHFinalize(&ghash);
| }
|
| void loop()
| {
| }
|
|
