int crypto_keypair_load_key (X509_KEYPAIR *keypair, const char *file, CRYPTO_PEM_PASSWD_CB *pem_callback, const void *pem_userdata);
void crypto_keypair_free (X509_KEYPAIR *keypair);
int crypto_default_pem_callback (char *buf, int size, const void *userdata);
int crypto_keypair_load_key (X509_KEYPAIR *keypair, const char *file, CRYPTO_PEM_PASSWD_CB *pem_callback, const void *pem_userdata);
void crypto_keypair_free (X509_KEYPAIR *keypair);
int crypto_default_pem_callback (char *buf, int size, const void *userdata);