import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;

public static String someHashMethod(String data, String hash) {
    byte[] hashBytes = hash.getBytes();
    SecretKeySpec signKey = new SecretKeySpec(hashBytes, "HmacSHA1");

    Mac mac = Mac.getInstance("HmacSHA1");
    mac.init(signKey);

    byte[] rawHmac = mac.doFinal(data.getBytes());

    BigInteger number = new BigInteger(1, rawHmac);
    String returnHash = number.toString(16);

    if (returnHash.length() == 39) {
        returnHash = "0" + returnHash;
    }
    return returnHash;
}