int ecp_util_read_key(int fd, ecp_ecdh_public_t *public, ecp_ecdh_private_t *private, int *line_cnt);
int ecp_util_write_key(int fd, ecp_ecdh_public_t *public, ecp_ecdh_private_t *private, int *line_cnt);

int ecp_util_load_key(char *filename, ecp_ecdh_public_t *public, ecp_ecdh_private_t *private);
int ecp_util_save_key(char *filename, ecp_ecdh_public_t *public, ecp_ecdh_private_t *private);