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#ifndef NCR_DH_H
# define NCR_DH_H
#include <tomcrypt.h>
typedef struct {
int type; /* PK_PRIVATE or PK_PUBLIC */
mp_int p;
mp_int g;
mp_int x; /* private */
mp_int y; /* public: y=g^x */
} dh_key;
int dh_generate_key(dh_key * key);
int dh_import_params(dh_key * key, uint8_t* p, size_t p_size, uint8_t* g, size_t g_size);
void dh_free(dh_key * key);
int dh_generate_public(dh_key * public, dh_key* private);
int dh_export(uint8_t *out, unsigned long *outlen, int type, dh_key *key);
int dh_import(const uint8_t *in, size_t inlen, dh_key *key);
int dh_derive_gxy(struct key_item_st* newkey, dh_key * key,
void* pk, size_t pk_size);
#endif
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