Md5.java

package com.acme.gwt.shared.util;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 * Created by IntelliJ IDEA.
 * User: jim
 * Date: 3/11/11
 * Time: 11:14 AM
 * To change this template use File | Settings | File Templates.
 */
public class Md5 {
	public static final String HTTP = "http://";
	public static final String[] GRAVPREFIX = {HTTP, HTTP + "0.", HTTP + "1.",
			HTTP + "2.", HTTP + "www.",};
	public static int c;

	public static String md5Hex(String input) {
		MessageDigest md5;

		try {
			md5 = MessageDigest.getInstance("MD5");
			md5.reset();
			md5.update(input.getBytes());

			byte messageDigest[] = md5.digest();
			final int length = messageDigest.length;
			final Byte[] bytes = new Byte[length];
			for (int i = 0; i < bytes.length; i++) {
				bytes[i] = messageDigest[i];

			}

			return rgb2hex(bytes);
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace(); //Todo: verify for a purpose
		}
		return null;
	}

	public static <T extends Number> String rgb2hex(final String prefix, T... c) {
		final StringBuilder sb = prefix == null
				? new StringBuilder()
				: new StringBuilder(prefix);
		for (T b : c) {
			sb.append(Integer.toHexString(((b.intValue())) & 0xff | 0x100)
					.substring(1));
		}
		return sb.toString();
	}

	public static <T extends Number> String rgb2hex(T... c) {
		return rgb2hex(null, c);
	}
}