PHP 实现AES/CBC/PKCS5Padding加解密（对称加密）

/**
 * Class Aes
 */
class Aes {
    private $iv = '';//**偏移量IV，可自定义
    private $encryptKey = '';//AESkey，可自定义

    public function set_key($key){
        $this->encryptKey = $key;
    }

    public function set_iv($iv){
        $this->iv = $iv;
    }

    //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 urlsafe_b64encode($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);

        $encryptedData = urlsafe_b64decode($encryptStr);
        $encryptedData = mdecrypt_generic($module, $encryptedData);

        return $encryptedData;
    }
}

其中urlsafe_b64encode()和urlsafe_b64decode()函数可以在我的其他博客里面查找！！