package com.droiddev.utils;

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

import android.util.Log;

/**
 * MD5 util: this util is used to eccrypt string with MD5.
 *
 * @author Vincent Cheung
 * @since  May. 11, 2014
 */
public class MD5
{
	private static final String TAG = "MD5";
	
	public static String Encrypt(String origin) {
		MessageDigest md5 = null;
		
		try {
			md5 = MessageDigest.getInstance("MD5");
		} catch (NoSuchAlgorithmException e) {
			Log.d(TAG, "[md5 encrypt error]: " +e.getMessage());
			e.printStackTrace();
		}
		
		char[] charArray = origin.toCharArray();
		byte[] byteArray = new byte[charArray.length];
		
		for (int i = 0; i < charArray.length; i ++) {
			byteArray[i] = (byte) charArray[i];
		}
		
		byte[] md5Bytes = md5.digest(byteArray);
		/* transfer the result to hex string */
		StringBuffer hexValue = new StringBuffer();
		for (int i = 0; i < md5Bytes.length; i ++) {
			int val = ((int) md5Bytes[i]) & 0xff;
			if (val < 16) {
				hexValue.append("0");
			}
			
			hexValue.append(Integer.toHexString(val));
		}
		
		return hexValue.toString();
	}
}

package com.cooler.utils;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import android.util.Log;

/**
 * MD5 util: this util is used to eccrypt string with MD5.
 *
 * @author Vincent Cheung
 * @since  May. 11, 2014
 */
public class MD5
{
    private static final String TAG = MD5.class.getSimpleName();
	private static final String NULL = "";
	
	public static String Encrypt(String origin) {
		MessageDigest md5 = null;
		
		try {
			md5 = MessageDigest.getInstance("MD5");
		} catch (NoSuchAlgorithmException e) {
			Log.e(TAG, "[md5 encrypt error]: " + e.getMessage());
			return NULL;
		} 
		
		byte[] byteArray = null;
		try {
			byteArray = origin.getBytes("UTF-8");
		} catch (UnsupportedEncodingException e) {
			Log.e(TAG, "[md5 encrypt error]: " + e.getMessage());
			return NULL;
		}
		
		byte[] md5Bytes = md5.digest(byteArray);
		/* transfer the result to hex string */
		StringBuffer hexValue = new StringBuffer();
		for (int i = 0; i < md5Bytes.length; i ++) {
			int val = ((int) md5Bytes[i]) & 0xff;
			if (val < 16) {
				hexValue.append("0");
			}
			
			hexValue.append(Integer.toHexString(val));
		}
		
		return hexValue.toString();
	}
}

fix bug in MD5 when encypt chinese