rsae_priv_dec
int rsae_priv_dec(int, const u_char *, u_char *, RSA *, int);
RSA_meth_set_priv_dec(rsae_method, rsae_priv_dec);
static int rsae_priv_dec(int, const unsigned char *, unsigned char *,
RSA_meth_set_priv_dec(rsae_method, rsae_priv_dec);