OpenSSL::Timestamp::Request#message_imprint=

static VALUE
ossl_ts_req_set_msg_imprint(VALUE self, VALUE hash)
{
    TS_REQ *req;
    TS_MSG_IMPRINT *mi;
    StringValue(hash);

    GetTSRequest(self, req);
    mi = TS_REQ_get_msg_imprint(req);
    if (!TS_MSG_IMPRINT_set_msg(mi, (unsigned char *)RSTRING_PTR(hash), RSTRING_LENINT(hash)))
        ossl_raise(eTimestampError, "TS_MSG_IMPRINT_set_msg");

    return hash;
}