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��/**

 * Alipay.com Inc. Copyright (c) 2004-2005 All Rights Reserved.

 * 

 * <p>

 * Created on 2005-7-9

 * </p>

 */

package com.alipay.util;



import java.io.UnsupportedEncodingException;

import java.security.MessageDigest;

import java.security.NoSuchAlgorithmException;



/**

 * MD5R�[�{�l�

 */

public class Md5Encrypt {

	/**

	 * Used building output as Hex

	 */

	private static final char[] DIGITS = { '0', '1', '2', '3', '4', '5', '6',

			'7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };



	/**

	 * [�[W{&N2�ۈLMD5R�[�

	 * 

	 * @param text

	 *            fe�

	 * 

	 * @return [�e�

	 */

	public static String md5(String text) {

		MessageDigest msgDigest = null;



		try {

			msgDigest = MessageDigest.getInstance("MD5");

		} catch (NoSuchAlgorithmException e) {

			throw new IllegalStateException(

					"System doesn't support MD5 algorithm.");

		}



		try {

			msgDigest.update(text.getBytes("GBK"));



		} catch (UnsupportedEncodingException e) {



			throw new IllegalStateException(

					"System doesn't support your  EncodingException.");



		}



		byte[] bytes = msgDigest.digest();



		String md5Str = new String(encodeHex(bytes));



		return md5Str;

	}



	public static char[] encodeHex(byte[] data) {



		int l = data.length;



		char[] out = new char[l << 1];



		// two characters form the hex value.

		for (int i = 0, j = 0; i < l; i++) {

			out[j++] = DIGITS[(0xF0 & data[i]) >>> 4];

			out[j++] = DIGITS[0x0F & data[i]];

		}



		return out;

	}



}