在前面介绍了一些加密解密类的使用，这里综合起来做一个简单的测试，代码如下：

MainActivity：

复制代码 代码如下:
package com.home.testdes;

import android.os.Bundle;
import android.util.Log;
import android.app.Activity;

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
DESUtil u = new DESUtil();
String mi = u.getEnc("I love you");
Log.i("加密后", mi);
String ming = u.getDec(mi);
Log.i("解密后", ming);
}
}

加密解密工具类：

复制代码 代码如下:
package com.home.testdes;

import java.security.Key;
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.util.Base64;

/**
* 使用DES加密和解密工具类
*
* @author Administrator
*
*/
public class DESUtil {

private Key key;// 密钥的key值
private byte[] DESkey;
private byte[] DESIV = { 0x12, 0x34, 0x56, 0x78, (byte) 0x90, (byte) 0xAB,
(byte) 0xCD, (byte) 0xEF };
private AlgorithmParameterSpec iv = null;// 加密算法的参数接口

public DESUtil() {
try {
this.DESkey = "abcdefghijk".getBytes("UTF-8");// 设置密钥
DESKeySpec keySpec = new DESKeySpec(DESkey);// 设置密钥参数
iv = new IvParameterSpec(DESIV);// 设置向量
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");// 获得密钥工厂
key = keyFactory.generateSecret(keySpec);// 得到密钥对象
} catch (Exception e) {
e.printStackTrace();
}
}

/**
* 加密String 明文输入密文输出
*
* @param inputString
* 待加密的明文
* @return 加密后的字符串
*/
public String getEnc(String inputString) {
byte[] byteMi = null;
byte[] byteMing = null;
String outputString = "";
try {
byteMing = inputString.getBytes("UTF-8");
byteMi = this.getEncCode(byteMing);
byte[] temp = Base64.encode(byteMi, Base64.DEFAULT);
outputString = new String(temp);
} catch (Exception e) {
} finally {
byteMing = null;
byteMi = null;
}
return outputString;
}

/**
* 解密String 以密文输入明文输出
*
* @param inputString
* 需要解密的字符串
* @return 解密后的字符串
*/
public String getDec(String inputString) {
byte[] byteMing = null;
byte[] byteMi = null;
String strMing = "";
try {
byteMi = Base64.decode(inputString.getBytes(), Base64.DEFAULT);
byteMing = this.getDesCode(byteMi);
strMing = new String(byteMing, "UTF8");
} catch (Exception e) {
} finally {
byteMing = null;
byteMi = null;
}
return strMing;
}

/**
* 加密以byte[]明文输入,byte[]密文输出
*
* @param bt
* 待加密的字节码
* @return 加密后的字节码
*/
private byte[] getEncCode(byte[] bt) {
byte[] byteFina = null;
Cipher cipher;
try {
// 得到Cipher实例
cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, key, iv);
byteFina = cipher.doFinal(bt);
} catch (Exception e) {
e.printStackTrace();
} finally {
cipher = null;
}
return byteFina;
}

/**
* 解密以byte[]密文输入,以byte[]明文输出
*
* @param bt
* 待解密的字节码
* @return 解密后的字节码
*/
private byte[] getDesCode(byte[] bt) {
Cipher cipher;
byte[] byteFina = null;
try {
// 得到Cipher实例
cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, key, iv);
byteFina = cipher.doFinal(bt);
} catch (Exception e) {
e.printStackTrace();
} finally {
cipher = null;
}
return byteFina;
}
}