sign

static VALUE
ossl_x509crl_sign(VALUE self, VALUE key, VALUE digest)
{
    X509_CRL *crl;
    EVP_PKEY *pkey;
    const EVP_MD *md;

    GetX509CRL(self, crl);
    pkey = GetPrivPKeyPtr(key); /* NO NEED TO DUP */
    md = GetDigestPtr(digest);
    if (!X509_CRL_sign(crl, pkey, md)) {
        ossl_raise(eX509CRLError, NULL);
    }

    return self;
}