ecdsa.h

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/*
 *  Copyright The Mbed TLS Contributors
 *  SPDX-License-Identifier: Apache-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.
 */

#ifndef MBEDTLS_ECDSA_H
#define MBEDTLS_ECDSA_H
#include "mbedtls/private_access.h"

#include "mbedtls/build_info.h"

#include "mbedtls/ecp.h"
#include "mbedtls/md.h"

/*
 *     Ecdsa-Sig-Value ::= SEQUENCE {
 *         r       INTEGER,
 *         s       INTEGER
 *     }
 *
 * For each of r and s, the value (V) may include an extra initial "0" bit.
 */
#define MBEDTLS_ECDSA_MAX_SIG_LEN( bits )                               \
    ( /*T,L of SEQUENCE*/ ( ( bits ) >= 61 * 8 ? 3 : 2 ) +              \
      /*T,L of r,s*/        2 * ( ( ( bits ) >= 127 * 8 ? 3 : 2 ) +     \
      /*V of r,s*/                ( ( bits ) + 8 ) / 8 ) )

#define MBEDTLS_ECDSA_MAX_LEN  MBEDTLS_ECDSA_MAX_SIG_LEN( MBEDTLS_ECP_MAX_BITS )

#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 MBEDTLS_PRIVATE(ecp);        
    mbedtls_ecdsa_restart_ver_ctx *MBEDTLS_PRIVATE(ver); 
    mbedtls_ecdsa_restart_sig_ctx *MBEDTLS_PRIVATE(sig); 
#if defined(MBEDTLS_ECDSA_DETERMINISTIC)
    mbedtls_ecdsa_restart_det_ctx *MBEDTLS_PRIVATE(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_can_do( mbedtls_ecp_group_id gid );

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_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 sig_size, 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 sig_size, size_t *slen,
                           int (*f_rng)(void *, unsigned char *, size_t),
                           void *p_rng,
                           mbedtls_ecdsa_restart_ctx *rs_ctx );

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 */