php加密解密

<?php
class Mcrypt
{
/**
* 解密
*
* @param string $encryptedText 已加密字符串
* @param string $key 密钥
* @return string
*/
public static function _decrypt($encryptedText,$key = null)
{
$key = $key === null ? Config::get('secret_key') : $key;
$cryptText = base64_decode($encryptedText);
$ivSize = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
$iv = mcrypt_create_iv($ivSize, MCRYPT_RAND);
$decryptText = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $key, $cryptText, MCRYPT_MODE_ECB, $iv);
return trim($decryptText);
}

/**
* 加密
*
* @param string $plainText 未加密字符串
* @param string $key 密钥
*/
public static function _encrypt($plainText,$key = null)
{
$key = $key === null ? Config::get('secret_key') : $key;
$ivSize = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
$iv = mcrypt_create_iv($ivSize, MCRYPT_RAND);
$encryptText = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $plainText, MCRYPT_MODE_ECB, $iv);
return trim(base64_encode($encryptText));
}
}