php实现AES/CBC/PKCS5Padding加密解密（又叫：对称加密）-优快云博客

今天在做一个和java程序接口的架接，java那边需要我这边(PHP)对传过去的值进行AES对称加密，接口返回的结果也是加密过的（就要用到解密），然后试了很多办法，也一一对应了AES的key密钥值，偏移量（IV）的值，都还是不能和java加密解密的结果一样，我很郁闷，我很焦躁。接着我就去找了一些文档，结果发现PHP里面补码方式只有：ZeroPadding这一种方式，而java接口那边是用PKCS5Padding补码方式，发现了问题所在，就编写了如下PHP实现AES/CBC/PKCS5Padding的加密解密方式。如有错误，还请指正！下面贴出详细代码

 
           <?php 
          
           class 
           MagicCrypt { 
          
           private 
           $iv 
           =  
           "0102030405060708" 
           ; 
           //密钥偏移量IV，可自定义 
          
           private 
           $encryptKey 
           =  
           "自定义16位长度key" 
           ; 
           //AESkey，可自定义 
          
           //加密 
          
           public 
           function 
           encrypt( 
           $encryptStr 
           ) { 
          
           $localIV 
           =  
           $this 
           ->iv; 
          
           $encryptKey 
           =  
           $this 
           ->encryptKey; 
          
           //Open module 
          
           $module 
           = mcrypt_module_open(MCRYPT_RIJNDAEL_128,  
           '' 
           , MCRYPT_MODE_CBC,  
           $localIV 
           ); 
          
           //print "module = $module <br/>" ; 
          
           mcrypt_generic_init( 
           $module 
           ,  
           $encryptKey 
           ,  
           $localIV 
           ); 
          
           //Padding 
          
           $block 
           = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC); 
          
           $pad 
           =  
           $block 
           - ( 
           strlen 
           ( 
           $encryptStr 
           ) %  
           $block 
           );  
           //Compute how many characters need to pad 
          
           $encryptStr 
           .=  
           str_repeat 
           ( 
           chr 
           ( 
           $pad 
           ),  
           $pad 
           );  
           // After pad, the str length must be equal to block or its integer multiples 
          
           //encrypt 
          
           $encrypted 
           = mcrypt_generic( 
           $module 
           ,  
           $encryptStr 
           ); 
          
           //Close 
          
           mcrypt_generic_deinit( 
           $module 
           ); 
          
           mcrypt_module_close( 
           $module 
           ); 
          
           return 
           base64_encode 
           ( 
           $encrypted 
           ); 
          
           } 
          
           //解密 
          
           public 
           function 
           decrypt( 
           $encryptStr 
           ) { 
          
           $localIV 
           =  
           $this 
           ->iv; 
          
           $encryptKey 
           =  
           $this 
           ->encryptKey; 
          
           //Open module 
          
           $module 
           = mcrypt_module_open(MCRYPT_RIJNDAEL_128,  
           '' 
           , MCRYPT_MODE_CBC,  
           $localIV 
           ); 
          
           //print "module = $module <br/>" ; 
          
           mcrypt_generic_init( 
           $module 
           ,  
           $encryptKey 
           ,  
           $localIV 
           ); 
          
           $encryptedData 
           =  
           base64_decode 
           ( 
           $encryptStr 
           ); 
          
           $encryptedData 
           = mdecrypt_generic( 
           $module 
           ,  
           $encryptedData 
           ); 
          
           return 
           $encryptedData 
           ; 
          
           } 
          
           } 
          
           $encryptString 
           =  
           'gz1DR+BsCzQe55HFdq1IiQ==' 
           ; 
          
           $encryptObj 
           =  
           new 
           MagicCrypt(); 
          
           $result 
           =  
           $encryptObj 
           ->encrypt( 
           $encryptString 
           ); 
           //加密结果 
          
           $decryptString 
           =  
           $decryptString 
           =  
           $encryptObj 
           ->decrypt( 
           $result 
           ); 
           //解密结果 
          
           echo 
           $result 
           .  
           "<br/>" 
           ; 
          
           echo 
           $decryptString 
           .  
           "<br/>" 
           ; 
          
           ?>