Java Code for Calculating HMAC-SHA1 & HMAC-SHA256 Signature

package com.pritom.kumar;

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

/**
 * Created by pritom on 09/10/2014.
 */
public class HmacSha1 {
    public static void main(String[] args) {
        System.out.println(hmacSha1("mykey", "helloworld"));
        System.out.println(hmacSha256("mykey", "helloworld"));
    }

    public static String hmacSha1(String KEY, String VALUE) {
        return hmacSha(KEY, VALUE, "HmacSHA1");
    }

    public static String hmacSha256(String KEY, String VALUE) {
        return hmacSha(KEY, VALUE, "HmacSHA256");
    }

    private static String hmacSha(String KEY, String VALUE, String SHA_TYPE) {
        try {
            SecretKeySpec signingKey = new SecretKeySpec(KEY.getBytes("UTF-8"), SHA_TYPE);
            Mac mac = Mac.getInstance(SHA_TYPE);
            mac.init(signingKey);
            byte[] rawHmac = mac.doFinal(VALUE.getBytes("UTF-8"));

            byte[] hexArray = {
                    (byte)'0', (byte)'1', (byte)'2', (byte)'3',
                    (byte)'4', (byte)'5', (byte)'6', (byte)'7',
                    (byte)'8', (byte)'9', (byte)'a', (byte)'b',
                    (byte)'c', (byte)'d', (byte)'e', (byte)'f'
            };
            byte[] hexChars = new byte[rawHmac.length * 2];
            for ( int j = 0; j < rawHmac.length; j++ ) {
                int v = rawHmac[j] & 0xFF;
                hexChars[j * 2] = hexArray[v >>> 4];
                hexChars[j * 2 + 1] = hexArray[v & 0x0F];
            }
            return new String(hexChars);
        }
        catch (Exception ex) {
            throw new RuntimeException(ex);
        }
    }
}

Output would be like this:

74ae5a4a3d9996d5918defc2c3d475471bbf59ac
7fdfaa9c9c0931f52d9ebf2538bc99700f2e771f3af1c1d93945c2256c11aedd