rsae_priv_enc
int rsae_priv_enc(int, const u_char *, u_char *, RSA *, int);
RSA_meth_set_priv_enc(rsae_method, rsae_priv_enc);
static int rsae_priv_enc(int, const unsigned char *, unsigned char *,
RSA_meth_set_priv_enc(rsae_method, rsae_priv_enc);