ecdh.h

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#ifndef POLARSSL_ECDH_H
#define POLARSSL_ECDH_H
 
#include "ecp.h"
 
#ifdef __cplusplus
extern "C" {
#endif
 
typedef enum
{
    POLARSSL_ECDH_OURS,
    POLARSSL_ECDH_THEIRS,
} ecdh_side;
 
typedef struct
{
    ecp_group grp;      
    mpi d;              
    ecp_point Q;        
    ecp_point Qp;       
    mpi z;              
    int point_format;   
    ecp_point Vi;       
    ecp_point Vf;       
    mpi _d;             
}
ecdh_context;
 
int ecdh_gen_public( ecp_group *grp, mpi *d, ecp_point *Q,
                     int (*f_rng)(void *, unsigned char *, size_t),
                     void *p_rng );
 
int ecdh_compute_shared( ecp_group *grp, mpi *z,
                         const ecp_point *Q, const mpi *d,
                         int (*f_rng)(void *, unsigned char *, size_t),
                         void *p_rng );
 
void ecdh_init( ecdh_context *ctx );
 
void ecdh_free( ecdh_context *ctx );
 
int ecdh_make_params( ecdh_context *ctx, size_t *olen,
                      unsigned char *buf, size_t blen,
                      int (*f_rng)(void *, unsigned char *, size_t),
                      void *p_rng );
 
int ecdh_read_params( ecdh_context *ctx,
                      const unsigned char **buf, const unsigned char *end );
 
int ecdh_get_params( ecdh_context *ctx, const ecp_keypair *key,
                     ecdh_side side );
 
int ecdh_make_public( ecdh_context *ctx, size_t *olen,
                      unsigned char *buf, size_t blen,
                      int (*f_rng)(void *, unsigned char *, size_t),
                      void *p_rng );
 
int ecdh_read_public( ecdh_context *ctx,
                      const unsigned char *buf, size_t blen );
 
int ecdh_calc_secret( ecdh_context *ctx, size_t *olen,
                      unsigned char *buf, size_t blen,
                      int (*f_rng)(void *, unsigned char *, size_t),
                      void *p_rng );
 
int ecdh_self_test( int verbose );
 
#ifdef __cplusplus
}
#endif
 
#endif /* ecdh.h */