AES.php

<?php
class MagicCrypt
{
    public static $iv = "";
    public static $encryptKey = "";

    public function __construct($key = '', $iv = '')
    {
        $this->key = $key;
        $this->iv = $iv;
    }
    //加密
    public static function encrypt($encryptStr)
    {
        $localIV = self::$iv;
        $encryptKey = self::$encryptKey;

        //Open module
        $module = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, $localIV);
        mcrypt_generic_init($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 static function decrypt($encryptStr)
    {
        $localIV = self::$iv;
        $encryptKey = self::$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;
    }
}