[置顶] Android DES MD5 UTF—8 BASE64 加密解密

源码：http://download.csdn.net/download/lm_zp/9516883

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    >
 <TextView 
     android:id="@+id/text"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:text="加密和解密"
     
     />
   <EditText 
        android:id="@+id/jiami"
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:hint="请输入要加密的字符"
       />
 <Button 
     android:id="@+id/DESjiami"
      android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:text="DES加密"
     />
  <Button 
     android:id="@+id/MD5jiami"
      android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:text="MD5加密"
     />
   <Button 
     android:id="@+id/UTF_8jiami"
      android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:text="UTF-8加密"
     />
    <Button 
     android:id="@+id/Base64jiami"
      android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:text="Base64加密"
     />
     <EditText 
        android:id="@+id/jiemi"
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:hint="请输入要解密的字符"
       />
 <Button 
     android:id="@+id/DESjiemi"
      android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:text="DES解密"
     />
  
   <Button 
     android:id="@+id/UTF_8jiemi"
      android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:text="UTF-8解密"
     />
    <Button 
     android:id="@+id/Base64jiemi"
      android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:text="Base64解密"
     />
    
</LinearLayout>

package com.bawei.jiami;

import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.security.Key;
import java.security.MessageDigest;
import java.security.spec.AlgorithmParameterSpec;

import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;

import android.os.Bundle;
import android.app.Activity;
import android.util.Base64;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends Activity implements OnClickListener {

	private TextView xianshi;
	private EditText jiami;
	private EditText jiemi;
	private Button dESjiami;
	private Button mD5jiami;
	private Button uTF_8jiami;
	private Button base64jiami;
	private Button dESjiemi;
	private Button uTF_8jiemi;
	private Button base64jiemi;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		xianshi = (TextView) findViewById(R.id.text);
		jiami = (EditText) findViewById(R.id.jiami);
		jiemi = (EditText) findViewById(R.id.jiemi);
		dESjiami = (Button) findViewById(R.id.DESjiami);
		mD5jiami = (Button) findViewById(R.id.MD5jiami);
		uTF_8jiami = (Button) findViewById(R.id.UTF_8jiami);
		base64jiami = (Button) findViewById(R.id.Base64jiami);
		dESjiemi = (Button) findViewById(R.id.DESjiemi);
		uTF_8jiemi = (Button) findViewById(R.id.UTF_8jiemi);
		base64jiemi = (Button) findViewById(R.id.Base64jiemi);
		dESjiami.setOnClickListener(this);
		mD5jiami.setOnClickListener(this);
		uTF_8jiami.setOnClickListener(this);
		base64jiami.setOnClickListener(this);
		dESjiemi.setOnClickListener(this);
		uTF_8jiemi.setOnClickListener(this);
		base64jiemi.setOnClickListener(this);

	}

	@Override
	public void onClick(View v) {
		// TODO Auto-generated method stub
		String jiami1 = jiami.getText().toString();
		String jiemi1 = jiemi.getText().toString();
		switch (v.getId()) {
		//DES加密
		case R.id.DESjiami:
			String desjia = encrypt(jiami1);
			xianshi.setText(desjia);
			break;
           //MD5加密
		case R.id.MD5jiami:
			String md5jia = MD5(jiami1,true);
			
			xianshi.setText(md5jia);
			break;
			//UTF_8  加密
		case R.id.UTF_8jiami:
			try {
				String utf_8jia = URLEncoder.encode(jiami1,"utf-8");
				xianshi.setText(utf_8jia);
			} catch (UnsupportedEncodingException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			break;
			//BASe64加密
		case R.id.Base64jiami:
			byte[] bs = jiami1.getBytes();
			String base64jia = new String(Base64.encode(bs, Base64.DEFAULT));
			xianshi.setText(base64jia);
			break;
			//DES解密
		case R.id.DESjiemi:
			String desjie = decrypt(jiemi1);
			xianshi.setText(desjie);
			break;
		 //UTF_8解密
		case R.id.UTF_8jiemi:
			try {
				String utf_8jie = URLDecoder.decode(jiemi1,"utf-8");
				xianshi.setText(utf_8jie);
			} catch (UnsupportedEncodingException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			break;
		//Base64解密
		case R.id.Base64jiemi:
			String base64jie = new String(Base64.decode(jiemi1.getBytes(), Base64.DEFAULT));
			xianshi.setText(base64jie);

			break;

		}
	}
	
	
	/**
	 * MD5加密
	 * @param str
	 * @param isUp 
	 * true是否大写
	 * @return
	 */
	public static String MD5(String str, boolean isUp) {
		MessageDigest md5 = null;
		try {
			md5 = MessageDigest.getInstance("MD5");
		} catch (Exception e) {
			e.printStackTrace();
			return "";
		}
		char[] charArray = str.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);

		StringBuffer hexValue = new StringBuffer();
		for (int i = 0; i < md5Bytes.length; i++) {
			int val = (md5Bytes[i]) & 0xff;
			if (val < 16) {
				hexValue.append("0");
			}
			hexValue.append(Integer.toHexString(val));
		}
		if (isUp) {
			return (hexValue.toString()).toUpperCase();
		} else {
			return hexValue.toString();
		}
	}
	
	public String ALGORITHM_DES = "DES/CBC/PKCS5Padding";

	public String DESKEY = "QpOiUnYbVp3bB73Fsn7O12CX";

	/**
	 * DES加密方式
	 * 
	 * @param data
	 * @return
	 */
	public String encrypt(String data) {
		String str = encrypt(DESKEY, data);
		return str;
	}

	/**
	 * DES解密方式
	 * @param data
	 * @return
	 */
	public String decrypt(String data) {

		String str = decrypt(DESKEY, data);
		return str;
	}

	/**
	 * DES算法，加密
	 * 
	 * @param data
	 *            待加密字符串
	 * @param key
	 *            加密私钥，长度不能够小于8位
	 * @return 加密后的字节数组，一般结合Base64编码使用
	 * @throws InvalidAlgorithmParameterException
	 * @throws Exception
	 */
	public String encrypt(String key, String data) {
		if (data == null)
			return null;
		try {
			DESKeySpec dks = new DESKeySpec(key.getBytes());
			SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
			// key的长度不能够小于8位字节
			Key secretKey = keyFactory.generateSecret(dks);
			Cipher cipher = Cipher.getInstance(ALGORITHM_DES);
			IvParameterSpec iv = new IvParameterSpec("12345678".getBytes());
			AlgorithmParameterSpec paramSpec = iv;
			cipher.init(Cipher.ENCRYPT_MODE, secretKey, paramSpec);
			byte[] bytes = cipher.doFinal(data.getBytes());
			return byte2hex(bytes);
		} catch (Exception e) {
			e.printStackTrace();
			return data;
		}
	}

	/**
	 * DES算法，解密
	 * 
	 * @param data
	 *            待解密字符串
	 * @param key
	 *            解密私钥，长度不能够小于8位
	 * @return 解密后的字节数组
	 * @throws Exception
	 *             异常
	 */
	public String decrypt(String key, String data) {
		if (data == null)
			return null;
		try {
			DESKeySpec dks = new DESKeySpec(key.getBytes());
			SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
			// key的长度不能够小于8位字节
			Key secretKey = keyFactory.generateSecret(dks);
			Cipher cipher = Cipher.getInstance(ALGORITHM_DES);
			IvParameterSpec iv = new IvParameterSpec("12345678".getBytes());
			AlgorithmParameterSpec paramSpec = iv;
			cipher.init(Cipher.DECRYPT_MODE, secretKey, paramSpec);
			return new String(cipher.doFinal(hex2byte(data.getBytes())));
		} catch (Exception e) {
			e.printStackTrace();
			return data;
		}
	}

	/**
	 * 二行制转字符串
	 * 
	 * @param b
	 * @return
	 */
	private static String byte2hex(byte[] b) {
		StringBuilder hs = new StringBuilder();
		String stmp;
		for (int n = 0; b != null && n < b.length; n++) {
			stmp = Integer.toHexString(b[n] & 0XFF);
			if (stmp.length() == 1)
				hs.append('0');
			hs.append(stmp);
		}
		return hs.toString().toUpperCase();
	}

	private static byte[] hex2byte(byte[] b) {
		if ((b.length % 2) != 0)
			throw new IllegalArgumentException();
		byte[] b2 = new byte[b.length / 2];
		for (int n = 0; n < b.length; n += 2) {
			String item = new String(b, n, 2);
			b2[n / 2] = (byte) Integer.parseInt(item, 16);
		}
		return b2;
	}
	
	
	

}