/*
 *  Copyright (C) 2017 - This file is part of libecc project
 *
 *  Authors:
 *      Ryad BENADJILA <ryadbenadjila@gmail.com>
 *      Arnaud EBALARD <arnaud.ebalard@ssi.gouv.fr>
 *      Jean-Pierre FLORI <jean-pierre.flori@ssi.gouv.fr>
 *
 *  Contributors:
 *      Nicolas VIVET <nicolas.vivet@ssi.gouv.fr>
 *      Karim KHALFALLAH <karim.khalfallah@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_SIG_DECDSA

#if !defined(WITH_HMAC)
#error "DECDSA signature needs HMAC, please activate it!"
#endif
#include <libecc/hash/hmac.h>

#include <libecc/nn/nn_rand.h>
#include <libecc/nn/nn_mul_public.h>
#include <libecc/nn/nn_logical.h>

#include <libecc/sig/sig_algs_internal.h>
#include <libecc/sig/ec_key.h>
#include <libecc/utils/utils.h>
#ifdef VERBOSE_INNER_VALUES
#define EC_SIG_ALG "DECDSA"
#endif
#include <libecc/utils/dbg_sig.h>

int decdsa_init_pub_key(ec_pub_key *out_pub, const ec_priv_key *in_priv)
{
        return __ecdsa_init_pub_key(out_pub, in_priv, DECDSA);
}

int decdsa_siglen(u16 p_bit_len, u16 q_bit_len, u8 hsize, u8 blocksize, u8 *siglen)
{
        return __ecdsa_siglen(p_bit_len, q_bit_len, hsize, blocksize, siglen);
}

int _decdsa_sign_init(struct ec_sign_context *ctx)
{
        int ret;

        /* Override our random source with NULL since we want a deterministic
         * generation.
         */
        MUST_HAVE((ctx != NULL), ret, err);

        ctx->rand = NULL;
        ret =  __ecdsa_sign_init(ctx, DECDSA);

err:
        return ret;
}

int _decdsa_sign_update(struct ec_sign_context *ctx,
                       const u8 *chunk, u32 chunklen)
{
        int ret;

        /* NOTE: for deterministic ECDSA, the random source MUST be NULL, hence
         * the following check.
         */
        MUST_HAVE((ctx != NULL) && (ctx->rand == NULL), ret, err);

        ret = __ecdsa_sign_update(ctx, chunk, chunklen, DECDSA);

err:
        return ret;
}

int _decdsa_sign_finalize(struct ec_sign_context *ctx, u8 *sig, u8 siglen)
{
        int ret;

        /* NOTE: for deterministic ECDSA, the random source MUST be NULL, hence
         * the following check.
         */
        MUST_HAVE((ctx != NULL) && (ctx->rand == NULL), ret, err);

        ret =  __ecdsa_sign_finalize(ctx, sig, siglen, DECDSA);

err:
        return ret;
}

int _decdsa_verify_init(struct ec_verify_context *ctx, const u8 *sig, u8 siglen)
{
        return __ecdsa_verify_init(ctx, sig, siglen, DECDSA);
}

int _decdsa_verify_update(struct ec_verify_context *ctx,
                         const u8 *chunk, u32 chunklen)
{
        return __ecdsa_verify_update(ctx, chunk, chunklen, DECDSA);
}

int _decdsa_verify_finalize(struct ec_verify_context *ctx)
{
        return __ecdsa_verify_finalize(ctx, DECDSA);
}

int decdsa_public_key_from_sig(ec_pub_key *out_pub1, ec_pub_key *out_pub2, const ec_params *params,
                              const u8 *sig, u8 siglen, const u8 *hash, u8 hsize)
{
        return __ecdsa_public_key_from_sig(out_pub1, out_pub2, params, sig, siglen, hash, hsize, DECDSA);
}

#else /* WITH_SIG_DECDSA */

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