php實現AES/CBC/PKCS5Padding加密解密（又叫：對稱加密）-1

   配合java程序接口的架接，java那邊需要我這邊對傳過去的值進行AES對稱加密，接口返回的結果也是加密過的（就要用到解密），然后試了很多辦法，也一一對應了AES的key密鑰值，偏移量（IV）的值，都還是不能和java加密解密的結果一樣。接着我就去找了一些文檔，結果發現PHP里面補碼方式只有：ZeroPadding這一種方式，而java接口那邊是用PKCS5Padding補碼方式，發現了問題所在，就編寫了如下PHP實現AES/CBC/PKCS5Padding的加密解密方式。如有錯誤，還請指正！

<?php
 
class MagicCrypt {
    private $iv = "0102030405060708";//密鑰偏移量IV，可自定義
 
    private $encryptKey = "自定義16位長度key";//AESkey，可自定義
 
    //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);//加密結果
$decryptString = $decryptString = $encryptObj->decrypt($result);//解密結果
echo $result . "<br/>";
echo $decryptString . "<br/>";
?>