/*
 *  Copyright 2014-2024 The GmSSL Project. All Rights Reserved.
 *
 *  Licensed under the Apache License, Version 2.0 (the License); you may
 *  not use this file except in compliance with the License.
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 */


#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>
#include <gmssl/ghash.h>
#include <gmssl/hex.h>
#include <gmssl/rand.h>
#include <gmssl/error.h>


struct {
	char *H;
	char *A;
	char *C;
	char *T;
} ghash_tests[] = {
	// test 1
	{
		"66e94bd4ef8a2c3b884cfa59ca342b2e",
		"",
		"",
		"00000000000000000000000000000000",
	},
	// test 2
	{
		"66e94bd4ef8a2c3b884cfa59ca342b2e",
		"",
		"0388dace60b6a392f328c2b971b2fe78",
		"f38cbb1ad69223dcc3457ae5b6b0f885",

	},
	// test 3
	{
		"b83b533708bf535d0aa6e52980d53b78",
		"",
		"42831ec2217774244b7221b784d0d49c"
		"e3aa212f2c02a4e035c17e2329aca12e"
		"21d514b25466931c7d8f6a5aac84aa05"
		"1ba30b396a0aac973d58e091473f5985",
		"7f1b32b81b820d02614f8895ac1d4eac",
	},
	// test 4
	{
		"b83b533708bf535d0aa6e52980d53b78",
		"feedfacedeadbeeffeedfacedeadbeef"
		"abaddad2",
		"42831ec2217774244b7221b784d0d49c"
		"e3aa212f2c02a4e035c17e2329aca12e"
		"21d514b25466931c7d8f6a5aac84aa05"
		"1ba30b396a0aac973d58e091",
		"698e57f70e6ecc7fd9463b7260a9ae5f",
	},
	// test 5
	{
		"b83b533708bf535d0aa6e52980d53b78",
		"feedfacedeadbeeffeedfacedeadbeef"
		"abaddad2",
		"61353b4c2806934a777ff51fa22a4755"
		"699b2a714fcdc6f83766e5f97b6c7423"
		"73806900e49f24b22b097544d4896b42"
		"4989b5e1ebac0f07c23f4598",
		"df586bb4c249b92cb6922877e444d37b",
	},
	// test 6
	{
		"b83b533708bf535d0aa6e52980d53b78",
		"feedfacedeadbeeffeedfacedeadbeef"
		"abaddad2",
		"8ce24998625615b603a033aca13fb894"
		"be9112a5c3a211a8ba262a3cca7e2ca7"
		"01e4a9a4fba43c90ccdcb281d48c7c6f"
		"d62875d2aca417034c34aee5",
		"1c5afe9760d3932f3c9a878aac3dc3de",
	},
};

int test_ghash(void)
{
	uint8_t H[16];
	uint8_t A[32];
	uint8_t C[64];
	uint8_t T[16];
	uint8_t out[16];
	size_t Hlen, Alen, Clen, Tlen;
	int i;

	for (i = 0; i < sizeof(ghash_tests)/sizeof(ghash_tests[0]); i++) {
		hex_to_bytes(ghash_tests[i].H, strlen(ghash_tests[i].H), H, &Hlen);
		hex_to_bytes(ghash_tests[i].A, strlen(ghash_tests[i].A), A, &Alen);
		hex_to_bytes(ghash_tests[i].C, strlen(ghash_tests[i].C), C, &Clen);
		hex_to_bytes(ghash_tests[i].T, strlen(ghash_tests[i].T), T, &Tlen);
		ghash(H, A, Alen, C, Clen, out);

		if (memcmp(out, T, Tlen) != 0) {
			format_print(stderr, 0, 0, "test %d failed\n", i + 1);
			format_print(stderr, 0, 2, "H = %s\n", ghash_tests[i].H);
			format_print(stderr, 0, 2, "A = %s\n", ghash_tests[i].A);
			format_print(stderr, 0, 2, "C = %s\n", ghash_tests[i].C);
			format_bytes(stderr, 0, 2, "GHASH(H,A,C) = ", out, 16);
			format_print(stderr, 0, 2, "             = %s\n\n", ghash_tests[i].T);
			return -1;
		}
	}

	printf("%s() ok\n", __FUNCTION__);
	return 1;
}

int test_ghash_update(void)
{
	uint8_t H[16];
	uint8_t A[32];
	uint8_t C[80];
	uint8_t C_alias[80];
	uint8_t T[16];
	uint8_t out[16];
	size_t Hlen, Alen, Clen, Tlen;
	GHASH_CTX ghash_ctx;

	hex_to_bytes(ghash_tests[3].H, strlen(ghash_tests[3].H), H, &Hlen);
	hex_to_bytes(ghash_tests[3].A, strlen(ghash_tests[3].A), A, &Alen);
	hex_to_bytes(ghash_tests[3].C, strlen(ghash_tests[3].C), C, &Clen);
	hex_to_bytes(ghash_tests[3].T, strlen(ghash_tests[3].T), T, &Tlen);

	ghash_init(&ghash_ctx, H, A, Alen);
	ghash_update(&ghash_ctx, C, 7);
	ghash_update(&ghash_ctx, NULL, 0);
	ghash_update(&ghash_ctx, C + 7, Clen - 7);
	ghash_finish(&ghash_ctx, out);
	if (memcmp(out, T, Tlen) != 0) {
		error_print();
		return -1;
	}

	memcpy(C_alias, C, Clen);
	ghash(H, A, Alen, C_alias, Clen, C_alias);
	if (memcmp(C_alias, T, Tlen) != 0) {
		error_print();
		return -1;
	}

	printf("%s() ok\n", __FUNCTION__);
	return 1;
}

static int speed_ghash(void)
{
	GHASH_CTX ghash_ctx;
	uint8_t h[16] = {0};
	uint8_t aad[20] = {0};
	uint8_t blocks[4096];
	uint8_t ghash[16];
	clock_t start, end;
	double seconds;
	int i;

	ghash_init(&ghash_ctx, h, aad, sizeof(aad));
	for (i = 0; i < 4096; i++) {
		ghash_update(&ghash_ctx, blocks, sizeof(blocks));
	}
	start = clock();
	ghash_init(&ghash_ctx, h, aad, sizeof(aad));
	for (i = 0; i < 4096; i++) {
		ghash_update(&ghash_ctx, blocks, sizeof(blocks));
	}
	ghash_finish(&ghash_ctx, ghash);
	end = clock();

	seconds = (double)(end - start)/CLOCKS_PER_SEC;
	fprintf(stderr, "%s: %f MiB per second\n", __FUNCTION__, 16/seconds);

	return 1;
}


int main(int argc, char **argv)
{
	if (test_ghash() != 1) goto err;
	if (test_ghash_update() != 1) goto err;

#if ENABLE_TEST_SPEED
	speed_ghash();
#endif

	printf("%s all tests passed\n", __FILE__);
	return 0;
err:
	error_print();
	return -1;
}
