php提供的对称加密算法

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KEY 是之前定义的常量
Mcrypt::encrypt();
Mcrypt::decrypt();
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defined('ROOT') or exit('Access Denied');
 
class Mcrypt{
      
    public static function encrypt($code){
        return base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, md5(KEY), $code, MCRYPT_MODE_ECB, mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB), MCRYPT_RAND)));
    }
      
    public static function decrypt($code){
        return mcrypt_decrypt(MCRYPT_RIJNDAEL_256, md5(KEY), base64_decode($code), MCRYPT_MODE_ECB, mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB), MCRYPT_RAND));
    }
 
}