MD5.java

/*******************************************************************************
 * Copyright (C) 2009-2010 eoeMobile. 
 * All rights reserved.
 * http://www.eoeMobile.com/
 * 
 * CHANGE LOG:
 *  DATE			AUTHOR			COMMENTS
 * =============================================================================
 *  2010MAY11		Waznheng Ma		Refine for Constructor and error handler.
 *
 *******************************************************************************/

package edu.hebtu.movingcampus.utils;

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

import org.apache.http.impl.auth.UnsupportedDigestAlgorithmException;

import android.util.Log;

/**
 * @author Wongxming E-mail: Wongxming@eoemobile.com
 * @version 1.0
 */
public final class MD5 {
	private static final String LOG_TAG = "MD5";
	private static final String ALGORITHM = "MD5";

	private static char sHexDigits[] = { '0', '1', '2', '3', '4', '5', '6',
			'7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
	private static MessageDigest sDigest;

	static {
		try {
			sDigest = MessageDigest.getInstance(ALGORITHM);
		} catch (NoSuchAlgorithmException e) {
			LogUtil.e(LOG_TAG, "Get MD5 Digest failed.");
			throw new UnsupportedDigestAlgorithmException(ALGORITHM, e);
		}
	}

	private MD5() {
	}

	final public static String encode(String source) {
		byte[] btyes = source.getBytes();
		byte[] encodedBytes = sDigest.digest(btyes);

		return Utility.hexString(encodedBytes);
	}

	// public static void main(String[] args) {
	// // MD5 ("") = d41d8cd98f00b204e9800998ecf8427e
	// System.out.println(MD5.encode(""));
	// // MD5 ("a") = 0cc175b9c0f1b6a831c399e269772661
	// System.out.println(MD5.encode("a"));
	// // MD5 ("abc") = 900150983cd24fb0d6963f7d28e17f72
	// System.out.println(MD5.encode("abc"));
	// }
}