/* 
 *   Copyright 2014-2021 The GmSSL Project Authors. 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.
 *   You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 */


#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <gmssl/hex.h>
#include <gmssl/pbkdf2.h>



struct {
	char *pass;
	char *salt;
	int iter;
	int dklen;
	char *dk;
} pbkdf2_hmac_sha1_tests[] = {

	// rfc 6070 test vectors for pbkdf2-hmac-sha1
	{
		"password",
		"salt",
		1,
		20,
		"0c60c80f961f0e71f3a9b524af6012062fe037a6",
	},
	{
		"password",
		"salt",
		2,
		20,
		"ea6c014dc72d6f8ccd1ed92ace1d41f0d8de8957",
	},
	{
		"password",
		"salt",
		4096,
		20,
		"4b007901b765489abead49d926f721d065a429c1",
	},
	{
		"password",
		"salt",
		16777216,
		20,
		"eefe3d61cd4da4e4e9945b3d6ba2158c2634e984",
	},
	{
		"passwordPASSWORDpassword",
		"saltSALTsaltSALTsaltSALTsaltSALTsalt",
		4096,
		25,
		"3d2eec4fe41c849b80c8d83662c0e44a8b291a964cf2f07038",
	},
};


void test(void)
{
	HMAC_CTX ctx;
	uint8_t iter[4] = {0, 0, 0, 1};
	uint8_t mac[20];
	size_t len;
	int i;

	hmac_init(&ctx, DIGEST_sha1(), (uint8_t *)"password", 8);
	hmac_update(&ctx, (uint8_t *)"salt", 4);
	hmac_update(&ctx, iter, 4);
	hmac_finish(&ctx, mac, &len);

	for (i = 1; i < 4096; i++) {
		uint8_t buf[20];
		memset(&ctx, 0, sizeof(HMAC_CTX));
		hmac_init(&ctx, DIGEST_sha1(), (uint8_t *)"password", 8);
		hmac_update(&ctx, mac, len);
		hmac_finish(&ctx, buf, &len);
		int j;
		for (j = 0; j < len; j++) {
			mac[j] ^= buf[j];
		}
	}


	for (i = 0; i < len; i++) {
		printf("%02x", mac[i]);
	}
	printf("\n");
}

int main(void)
{
	int i;
	uint8_t key[64];
	uint8_t buf[64];
	size_t len;

	for (i = 0; i < sizeof(pbkdf2_hmac_sha1_tests)/sizeof(pbkdf2_hmac_sha1_tests[0]); i++) {
		hex2bin(pbkdf2_hmac_sha1_tests[i].dk, strlen(pbkdf2_hmac_sha1_tests[i].dk), buf);

		pbkdf2_genkey(DIGEST_sha1(),
			pbkdf2_hmac_sha1_tests[i].pass, strlen(pbkdf2_hmac_sha1_tests[i].pass),
			(uint8_t *)pbkdf2_hmac_sha1_tests[i].salt, strlen(pbkdf2_hmac_sha1_tests[i].salt),
			pbkdf2_hmac_sha1_tests[i].iter, pbkdf2_hmac_sha1_tests[i].dklen, key);

		if (memcmp(key, buf, pbkdf2_hmac_sha1_tests[i].dklen) != 0) {
			printf("%d failed\n", i);
		} else {
			printf("%d ok\n", i);
		}
	}

	return 1;
}