[PHP]AES加密----PHP服务端和Android客户端

本文采取128位AES-CBC模式加密和解密

1.首先对服务端安装mcrypt：

sudo apt-get install php5-mcrypt php5-dev

sudo php5enmod mcrypt

sudo service apache2 restart

2.PHP服务端AES加密类代码

class MCrypt
        {
                private $iv = 'fedcba9876543210'; //初始化向量iv
                public $key;//AES加密的密钥key
                                //将密钥$key传进本类
                function __construct($key)
                {
                                        $this->key=$key;
                }
                                //加密
                function encrypt($str) {
                  //$key = $this->hex2bin($key);    
                  $iv = $this->iv;
                  $td = mcrypt_module_open('rijndael-128', '', 'cbc', $iv);
                  mcrypt_generic_init($td, $this->key, $iv);
                  $encrypted = mcrypt_generic($td, $str);
                                  \OCP\Util::writeLog('***MCrypt $key***', $this->key, \OCP\Util::ERROR);
                  mcrypt_generic_deinit($td);
                  mcrypt_module_close($td);
                  return bin2hex($encrypted);
                }
                                //解密
                function decrypt($code) {
                  //$key = $this->hex2bin($key);
                  $code = $this->hex2bin($code);
                  $iv = $this->iv;
                  $td = mcrypt_module_open('rijndael-128', '', 'cbc', $iv);
                  mcrypt_generic_init($td, $this->key, $iv);
                  $decrypted = mdecrypt_generic($td, $code);
                  mcrypt_generic_deinit($td);
                  mcrypt_module_close($td);
                  return utf8_encode(trim($decrypted));
                }
                protected function hex2bin($hexdata) {
                  $bindata = '';
                  for ($i = 0; $i < strlen($hexdata); $i += 2) {
                        $bindata .= chr(hexdec(substr($hexdata, $i, 2)));
                  }
                  return $bindata;
                }
        }

4.PHP服务端调用ASE加密类代码：

$key="";//自己添加AES密钥
//将加密的key传进AES类
$mcrypt = new MCrypt($key);
//对数据库中的密码进行AES加密
$psw = $mcrypt->encrypt();

5.Android服务端AES解密代码：

在Android中创建一个AESUtil类，需要用时调用

/**
 * AES解密：
 * 对服务器发回来的密码进行解密
 * 
 */
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import javax.crypto.Cipher;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

import com.pcloud.android.ui.activity.FirstAuthenActivity;

public class AESUtil {
     private String iv = "fedcba9876543210";//虚拟的 iv。和服务端要保持一致
     private IvParameterSpec ivspec;
     private SecretKeySpec keyspec;
     private Cipher cipher;
     
  //   private String SecretKey = "";//虚拟的 密钥 
     String msgToken=FirstAuthenActivity.msgToken;
     //String msgUrl=FirstAuthenActivity.msgUrl;
     String msgRandom=FirstAuthenActivity.msgRandom;
     
     //把随机数和tokenid进行MD5操作来作为AES密钥，和服务端的AES加密密钥要保持一致
     String SecretKey=stringToMD5(msgToken+msgRandom);
     
     public AESUtil()
     {
             ivspec = new IvParameterSpec(iv.getBytes());

             keyspec = new SecretKeySpec(SecretKey.getBytes(), "AES");
             
             try {
                     cipher = Cipher.getInstance("AES/CBC/NoPadding");
             } catch (NoSuchAlgorithmException e) {
                     // TODO Auto-generated catch block
                     e.printStackTrace();
             } catch (NoSuchPaddingException e) {
                     // TODO Auto-generated catch block
                     e.printStackTrace();
             }
     }
     
     public byte[] encrypt(String text) throws Exception
     {
             if(text == null || text.length() == 0)
                     throw new Exception("Empty string");
             
             byte[] encrypted = null;

             try {
                     cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);

                     encrypted = cipher.doFinal(padString(text).getBytes());
             } catch (Exception e)
             {                       
                     throw new Exception("[encrypt] " + e.getMessage());
             }
             
             return encrypted;
     }
     
     public byte[] decrypt(String code) throws Exception
     {
             if(code == null || code.length() == 0)
                     throw new Exception("Empty string");
             
             byte[] decrypted = null;

             try {
                     cipher.init(Cipher.DECRYPT_MODE, keyspec, ivspec);
                     
                     decrypted = cipher.doFinal(hexToBytes(code));
             } catch (Exception e)
             {
                     throw new Exception("[decrypt] " + e.getMessage());
             }
             return decrypted;
     }
     

     
     public static String bytesToHex(byte[] data)
     {
             if (data==null)
             {
                     return null;
             }
             
             int len = data.length;
             String str = "";
             for (int i=0; i<len; i++) {
                     if ((data[i]&0xFF)<16)
                             str = str + "0" + java.lang.Integer.toHexString(data[i]&0xFF);
                     else
                             str = str + java.lang.Integer.toHexString(data[i]&0xFF);
             }
             return str;
     }
     
             
     public static byte[] hexToBytes(String str) {
             if (str==null) {
                     return null;
             } else if (str.length() < 2) {
                     return null;
             } else {
                     int len = str.length() / 2;
                     byte[] buffer = new byte[len];
                     for (int i=0; i<len; i++) {
                             buffer[i] = (byte) Integer.parseInt(str.substring(i*2,i*2+2),16);
                     }
                     return buffer;
             }
     }
     
     

     private static String padString(String source)
     {
       char paddingChar = ' ';
       int size = 16;
       int x = source.length() % size;
       int padLength = size - x;

       for (int i = 0; i < padLength; i++)
       {
               source += paddingChar;
       }

       return source;
     }

6.Android客户端调用AES类进行解密：

//调用AES解密
       AESUtil mcrypt;
       mcrypt = new AESUtil();
       try {
           //对收到的密码进行AES解密
           String decrypted = new String( mcrypt.decrypt( rec[1]) );
           Log.d("解密的：",decrypted);
            } catch (Exception e) {
           // TODO 自动生成的 catch 块
           e.printStackTrace();
       }