OpenSSL::OCSP::CertificateId#issuer_name_hash

static VALUE
ossl_ocspcid_get_issuer_name_hash(VALUE self)
{
    OCSP_CERTID *id;
    ASN1_OCTET_STRING *name_hash;
    VALUE ret;

    GetOCSPCertId(self, id);
    OCSP_id_get0_info(&name_hash, NULL, NULL, NULL, id);

    ret = rb_str_new(NULL, name_hash->length * 2);
    ossl_bin2hex(name_hash->data, RSTRING_PTR(ret), name_hash->length);

    return ret;
}