/*  test_hmac_prng.c - TinyCrypt implementation of some HMAC-PRNG tests */

/*
 *  Copyright (C) 2015 by Intel Corporation, All Rights Reserved.
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 *    - Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 *    - Neither the name of Intel Corporation nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 *  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 */

/*
 * DESCRIPTION
 * This module tests the following PRNG routines:
 *
 * Scenarios tested include:
 * - HMAC-PRNG init
 * - HMAC-PRNG reseed
 * - HMAC-PRNG generate)
 */

#include <tinycrypt/hmac_prng.h>
#include <tinycrypt/constants.h>

#include <stdio.h>
#include <tc_util.h>
#include <drivers/system_timer.h>
#include <ztest.h>

/*
 * Main task to test AES
 */

void test_hmac_prng(void)
{
	/* Fake personalization and additional_input
	 * (replace by appropriate values)
	 * e.g.: hostname+timestamp
	 */
	u8_t additional_input[] = "additional input";
	u8_t personalization[] = "HOSTNAME";
	u32_t size = (1 << 15);
	struct tc_hmac_prng_struct h;
	u8_t random[size];
	u8_t seed[128];
	u32_t i;

	TC_START("Performing HMAC-PRNG tests:");
	TC_PRINT("HMAC-PRNG test#1 (init, reseed, generate):\n");

	/* Fake seed (replace by a a truly random seed): */
	for (i = 0; i < (u32_t)sizeof(seed); ++i) {
		seed[i] = i;
	}

	TC_PRINT("HMAC-PRNG test#1 (init):\n");

	/**TESTPOINT: Check HMAC-PRNG init*/
	zassert_true(tc_hmac_prng_init(&h, personalization,
		sizeof(personalization)), "HMAC-PRNG initialization failed.");

	TC_PRINT("HMAC-PRNG test#1 (reseed):\n");

	/**TESTPOINT: Check HMAC-PRNG reseed*/
	zassert_true(tc_hmac_prng_reseed(&h, seed, sizeof(seed),
				additional_input, sizeof(additional_input)),
			"HMAC-PRNG reseed failed.");

	TC_PRINT("HMAC-PRNG test#1 (generate):\n");

	/**TESTPOINT: Check HMAC-PRNG generate*/
	zassert_false(tc_hmac_prng_generate(random, size, &h) < 1,
			"HMAC-PRNG generate failed.");

	TC_PRINT("All HMAC tests succeeded!\n");
}