OpenSSL::X509::CRL#by_serial

static VALUE
ossl_x509crl_by_serial(VALUE self, VALUE serial)
{
    X509_CRL *crl;
    X509_REVOKED *rev = NULL;
    ASN1_INTEGER *asn1_serial;
    int found;

    GetX509CRL(self, crl);
    asn1_serial = num_to_asn1integer(serial, NULL);

    /* 0 = not found, 1 = found, 2 = found with reason removeFromCRL */
    found = X509_CRL_get0_by_serial(crl, &rev, asn1_serial);
    ASN1_INTEGER_free(asn1_serial);

    if (found == 0)
        return Qnil;

    /* ossl_x509revoked_new dups, so the result outlives the CRL safely */
    return ossl_x509revoked_new(rev);
}