do_X509_REQ_verify
i = do_X509_REQ_verify(req, pktmp, vfyopts);
int do_X509_REQ_verify(X509_REQ *x, EVP_PKEY *pkey,
int ret = do_X509_REQ_verify(csr, pkey, vfyopts);
i = do_X509_REQ_verify(req, tpubkey, vfyopts);
i = do_X509_REQ_verify(req, pkey, vfyopts);