ecdh.h

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#ifndef MBEDTLS_ECDH_H
#define MBEDTLS_ECDH_H

#include "ecp.h"

#ifdef __cplusplus
extern "C" {
#endif

typedef enum
{
    MBEDTLS_ECDH_OURS,
    MBEDTLS_ECDH_THEIRS,
} mbedtls_ecdh_side;

typedef struct
{
    mbedtls_ecp_group grp;      
    mbedtls_mpi d;              
    mbedtls_ecp_point Q;        
    mbedtls_ecp_point Qp;       
    mbedtls_mpi z;              
    int point_format;   
    mbedtls_ecp_point Vi;       
    mbedtls_ecp_point Vf;       
    mbedtls_mpi _d;             
}
mbedtls_ecdh_context;

int mbedtls_ecdh_gen_public( mbedtls_ecp_group *grp, mbedtls_mpi *d, mbedtls_ecp_point *Q,
                     int (*f_rng)(void *, unsigned char *, size_t),
                     void *p_rng );

int mbedtls_ecdh_compute_shared( mbedtls_ecp_group *grp, mbedtls_mpi *z,
                         const mbedtls_ecp_point *Q, const mbedtls_mpi *d,
                         int (*f_rng)(void *, unsigned char *, size_t),
                         void *p_rng );

void mbedtls_ecdh_init( mbedtls_ecdh_context *ctx );

void mbedtls_ecdh_free( mbedtls_ecdh_context *ctx );

int mbedtls_ecdh_make_params( mbedtls_ecdh_context *ctx, size_t *olen,
                      unsigned char *buf, size_t blen,
                      int (*f_rng)(void *, unsigned char *, size_t),
                      void *p_rng );

int mbedtls_ecdh_read_params( mbedtls_ecdh_context *ctx,
                      const unsigned char **buf, const unsigned char *end );

int mbedtls_ecdh_get_params( mbedtls_ecdh_context *ctx, const mbedtls_ecp_keypair *key,
                     mbedtls_ecdh_side side );

int mbedtls_ecdh_make_public( mbedtls_ecdh_context *ctx, size_t *olen,
                      unsigned char *buf, size_t blen,
                      int (*f_rng)(void *, unsigned char *, size_t),
                      void *p_rng );

int mbedtls_ecdh_read_public( mbedtls_ecdh_context *ctx,
                      const unsigned char *buf, size_t blen );

int mbedtls_ecdh_calc_secret( mbedtls_ecdh_context *ctx, size_t *olen,
                      unsigned char *buf, size_t blen,
                      int (*f_rng)(void *, unsigned char *, size_t),
                      void *p_rng );

#ifdef __cplusplus
}
#endif

#endif /* ecdh.h */