ecdsa.h

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/*
 *  Copyright The Mbed TLS Contributors
 *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
 *
 *  This file is provided under the Apache License 2.0, or the
 *  GNU General Public License v2.0 or later.
 *
 *  **********
 *  Apache License 2.0:
 *
 *  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.
 *
 *  **********
 *
 *  **********
 *  GNU General Public License v2.0 or later:
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
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 *
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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *  with this program; if not, write to the Free Software Foundation, Inc.,
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 */
 
#ifndef MBEDTLS_ECDSA_H
#define MBEDTLS_ECDSA_H
 
#if !defined(MBEDTLS_CONFIG_FILE)
#include "config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif
 
#include "ecp.h"
#include "md.h"
 
/*
 * RFC-4492 page 20:
 *
 *     Ecdsa-Sig-Value ::= SEQUENCE {
 *         r       INTEGER,
 *         s       INTEGER
 *     }
 *
 * Size is at most
 *    1 (tag) + 1 (len) + 1 (initial 0) + ECP_MAX_BYTES for each of r and s,
 *    twice that + 1 (tag) + 2 (len) for the sequence
 * (assuming ECP_MAX_BYTES is less than 126 for r and s,
 * and less than 124 (total len <= 255) for the sequence)
 */
#if MBEDTLS_ECP_MAX_BYTES > 124
#error "MBEDTLS_ECP_MAX_BYTES bigger than expected, please fix MBEDTLS_ECDSA_MAX_LEN"
#endif
#define MBEDTLS_ECDSA_MAX_LEN  ( 3 + 2 * ( 3 + MBEDTLS_ECP_MAX_BYTES ) )
 
#ifdef __cplusplus
extern "C" {
#endif
 
typedef mbedtls_ecp_keypair mbedtls_ecdsa_context;
 
#if defined(MBEDTLS_ECP_RESTARTABLE)
 
typedef struct mbedtls_ecdsa_restart_ver mbedtls_ecdsa_restart_ver_ctx;
 
typedef struct mbedtls_ecdsa_restart_sig mbedtls_ecdsa_restart_sig_ctx;
 
#if defined(MBEDTLS_ECDSA_DETERMINISTIC)
typedef struct mbedtls_ecdsa_restart_det mbedtls_ecdsa_restart_det_ctx;
#endif
 
typedef struct
{
    mbedtls_ecp_restart_ctx ecp;        
    mbedtls_ecdsa_restart_ver_ctx *ver; 
    mbedtls_ecdsa_restart_sig_ctx *sig; 
#if defined(MBEDTLS_ECDSA_DETERMINISTIC)
    mbedtls_ecdsa_restart_det_ctx *det; 
#endif
} mbedtls_ecdsa_restart_ctx;
 
#else /* MBEDTLS_ECP_RESTARTABLE */
 
/* Now we can declare functions that take a pointer to that */
typedef void mbedtls_ecdsa_restart_ctx;
 
#endif /* MBEDTLS_ECP_RESTARTABLE */
 
int mbedtls_ecdsa_sign( mbedtls_ecp_group *grp, mbedtls_mpi *r, mbedtls_mpi *s,
                const mbedtls_mpi *d, const unsigned char *buf, size_t blen,
                int (*f_rng)(void *, unsigned char *, size_t), void *p_rng );
 
#if defined(MBEDTLS_ECDSA_DETERMINISTIC)
int mbedtls_ecdsa_sign_det( mbedtls_ecp_group *grp, mbedtls_mpi *r,
                            mbedtls_mpi *s, const mbedtls_mpi *d,
                            const unsigned char *buf, size_t blen,
                            mbedtls_md_type_t md_alg );
int mbedtls_ecdsa_sign_det_ext( mbedtls_ecp_group *grp, mbedtls_mpi *r,
                                mbedtls_mpi *s, const mbedtls_mpi *d,
                                const unsigned char *buf, size_t blen,
                                mbedtls_md_type_t md_alg,
                                int (*f_rng_blind)(void *, unsigned char *,
                                                   size_t),
                                void *p_rng_blind );
#endif /* MBEDTLS_ECDSA_DETERMINISTIC */
 
int mbedtls_ecdsa_verify( mbedtls_ecp_group *grp,
                          const unsigned char *buf, size_t blen,
                          const mbedtls_ecp_point *Q, const mbedtls_mpi *r,
                          const mbedtls_mpi *s);
 
int mbedtls_ecdsa_write_signature( mbedtls_ecdsa_context *ctx,
                                   mbedtls_md_type_t md_alg,
                           const unsigned char *hash, size_t hlen,
                           unsigned char *sig, size_t *slen,
                           int (*f_rng)(void *, unsigned char *, size_t),
                           void *p_rng );
 
int mbedtls_ecdsa_write_signature_restartable( mbedtls_ecdsa_context *ctx,
                           mbedtls_md_type_t md_alg,
                           const unsigned char *hash, size_t hlen,
                           unsigned char *sig, size_t *slen,
                           int (*f_rng)(void *, unsigned char *, size_t),
                           void *p_rng,
                           mbedtls_ecdsa_restart_ctx *rs_ctx );
 
#if defined(MBEDTLS_ECDSA_DETERMINISTIC)
#if ! defined(MBEDTLS_DEPRECATED_REMOVED)
#if defined(MBEDTLS_DEPRECATED_WARNING)
#define MBEDTLS_DEPRECATED    __attribute__((deprecated))
#else
#define MBEDTLS_DEPRECATED
#endif
int mbedtls_ecdsa_write_signature_det( mbedtls_ecdsa_context *ctx,
                               const unsigned char *hash, size_t hlen,
                               unsigned char *sig, size_t *slen,
                               mbedtls_md_type_t md_alg ) MBEDTLS_DEPRECATED;
#undef MBEDTLS_DEPRECATED
#endif /* MBEDTLS_DEPRECATED_REMOVED */
#endif /* MBEDTLS_ECDSA_DETERMINISTIC */
 
int mbedtls_ecdsa_read_signature( mbedtls_ecdsa_context *ctx,
                          const unsigned char *hash, size_t hlen,
                          const unsigned char *sig, size_t slen );
 
int mbedtls_ecdsa_read_signature_restartable( mbedtls_ecdsa_context *ctx,
                          const unsigned char *hash, size_t hlen,
                          const unsigned char *sig, size_t slen,
                          mbedtls_ecdsa_restart_ctx *rs_ctx );
 
int mbedtls_ecdsa_genkey( mbedtls_ecdsa_context *ctx, mbedtls_ecp_group_id gid,
                  int (*f_rng)(void *, unsigned char *, size_t), void *p_rng );
 
int mbedtls_ecdsa_from_keypair( mbedtls_ecdsa_context *ctx,
                                const mbedtls_ecp_keypair *key );
 
void mbedtls_ecdsa_init( mbedtls_ecdsa_context *ctx );
 
void mbedtls_ecdsa_free( mbedtls_ecdsa_context *ctx );
 
#if defined(MBEDTLS_ECP_RESTARTABLE)
void mbedtls_ecdsa_restart_init( mbedtls_ecdsa_restart_ctx *ctx );
 
void mbedtls_ecdsa_restart_free( mbedtls_ecdsa_restart_ctx *ctx );
#endif /* MBEDTLS_ECP_RESTARTABLE */
 
#ifdef __cplusplus
}
#endif
 
#endif /* ecdsa.h */