/*
 *  Copyright (C) 2022 - This file is part of libecc project
 *
 *  Authors:
 *      Ryad BENADJILA <ryadbenadjila@gmail.com>
 *      Arnaud EBALARD <arnaud.ebalard@ssi.gouv.fr>
 *
 *  This software is licensed under a dual BSD and GPL v2 license.
 *  See LICENSE file at the root folder of the project.
 */
#include <libecc/lib_ecc_config.h>
#ifdef WITH_HASH_BASH384

#include <libecc/hash/bash384.h>

/* Init hash function. Returns 0 on success, -1 on error. */
int bash384_init(bash384_context *ctx)
{
	int ret;

	ret = _bash_init(ctx, BASH384_DIGEST_SIZE); EG(ret, err);

	/* Tell that we are initialized */
	ctx->magic = BASH384_HASH_MAGIC;

err:
	return ret;
}

/* Update hash function. Returns 0 on success, -1 on error. */
int bash384_update(bash384_context *ctx, const u8 *input, u32 ilen)
{
	int ret;

	BASH384_HASH_CHECK_INITIALIZED(ctx, ret, err);

	ret = _bash_update((bash_context *)ctx, input, ilen);

err:
	return ret;
}

/* Finalize hash function. Returns 0 on success, -1 on error. */
int bash384_final(bash384_context *ctx, u8 output[BASH384_DIGEST_SIZE])
{
	int ret;

	BASH384_HASH_CHECK_INITIALIZED(ctx, ret, err);

	ret = _bash_finalize((bash_context *)ctx, output); EG(ret, err);

	/* Tell that we are uninitialized */
	ctx->magic = WORD(0);
	ret = 0;

err:
	return ret;
}

/*
 * Scattered version performing init/update/finalize on a vector of buffers
 * 'inputs' with the length of each buffer passed via 'ilens'. The function
 * loops on pointers in 'inputs' until it finds a NULL pointer. The function
 * returns 0 on success, -1 on error.
 */
int bash384_scattered(const u8 **inputs, const u32 *ilens,
			u8 output[BASH384_DIGEST_SIZE])
{
	bash384_context ctx;
	int ret, pos = 0;

	MUST_HAVE((inputs != NULL) && (ilens != NULL) && (output != NULL), ret, err);

	ret = bash384_init(&ctx); EG(ret, err);

	while (inputs[pos] != NULL) {
		const u8 *buf = inputs[pos];
		u32 buflen = ilens[pos];

		ret = bash384_update(&ctx, buf, buflen); EG(ret, err);

		pos += 1;
	}

	ret = bash384_final(&ctx, output);

err:
	return ret;
}

/*
 * Single call version performing init/update/final on given input.
 * Returns 0 on success, -1 on error.
 */
int bash384(const u8 *input, u32 ilen, u8 output[BASH384_DIGEST_SIZE])
{
	bash384_context ctx;
	int ret;

	ret = bash384_init(&ctx); EG(ret, err);
	ret = bash384_update(&ctx, input, ilen); EG(ret, err);
	ret = bash384_final(&ctx, output);

err:
	return ret;
}

#else /* WITH_HASH_BASH384 */

/*
 * Dummy definition to avoid the empty translation unit ISO C warning
 */
typedef int dummy;
#endif /* WITH_HASH_BASH384 */