ecdsa.h

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#ifndef MBEDTLS_ECDSA_H
#define MBEDTLS_ECDSA_H

#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 ) )

typedef mbedtls_ecp_keypair mbedtls_ecdsa_context;

#ifdef __cplusplus
extern "C" {
#endif

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 );
#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 );

#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_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 );

#ifdef __cplusplus
}
#endif

#endif /* ecdsa.h */