HmacUtil.groovy

package fitt.util

import javax.crypto.Mac
import javax.crypto.spec.SecretKeySpec
import java.security.SignatureException


class HmacUtil {
    static String hmac(String text, String secret) {
        String result

        try {
            // get an hmac_sha1 key from the raw key bytes
            SecretKeySpec signingKey = new SecretKeySpec(secret.getBytes(), "HmacSHA1");

            // get an hmac_sha1 Mac instance and initialize with the signing key
            Mac mac = Mac.getInstance("HmacSHA1");
            mac.init(signingKey);

            // compute the hmac on input data bytes
            byte[] rawHmac = mac.doFinal(text.getBytes());
            result= rawHmac.encodeHex()
        } catch (Exception e) {
            throw new SignatureException("Failed to generate HMAC : " + e.getMessage());
        }
        return result
    }
}