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, ASN1_STRING_length(name_hash) * 2);
    ossl_bin2hex(ASN1_STRING_get0_data(name_hash), RSTRING_PTR(ret),
                 ASN1_STRING_length(name_hash));

    return ret;
}