sign

static VALUE
ossl_ocspreq_sign(int argc, VALUE *argv, VALUE self)
{
    VALUE signer_cert, signer_key, certs, flags;
    OCSP_REQUEST *req;
    X509 *signer;
    EVP_PKEY *key;
    STACK_OF(X509) *x509s;
    unsigned long flg;
    int ret;

    rb_scan_args(argc, argv, "22", &signer_cert, &signer_key, &certs, &flags);
    signer = GetX509CertPtr(signer_cert);
    key = GetPrivPKeyPtr(signer_key);
    flg = NIL_P(flags) ? 0 : NUM2INT(flags);
    if(NIL_P(certs)){
        x509s = sk_X509_new_null();
        flags |= OCSP_NOCERTS;
    }
    else x509s = ossl_x509_ary2sk(certs);
    GetOCSPReq(self, req);
    ret = OCSP_request_sign(req, signer, key, EVP_sha1(), x509s, flg);
    sk_X509_pop_free(x509s, X509_free);
    if(!ret) ossl_raise(eOCSPError, NULL);

    return self;
}