[md]

<?php

/**
 * 消息内容加解密
 */
class MsgAes
{
    // 密码学方式，不可更改
    private static $method = \'AES-128-CBC\';

    // 加密
    public static function encrypt($aesKey, $data)
    {
        $ivLen        = openssl_cipher_iv_length(self::$method);
        $iv           = openssl_random_pseudo_bytes($ivLen);
        $encryptedStr = openssl_encrypt($data, self::$method, $aesKey, OPENSSL_RAW_DATA, $iv);
        return base64_encode($iv . $encryptedStr);
    }

    // 解密
    public static function decrypt($aesKey, $encryptedData)
    {
        $encryptedData = base64_decode($encryptedData);
        $ivLen         = openssl_cipher_iv_length(self::$method);
        $iv            = substr($encryptedData, 0, $ivLen);
        $encryptedStr  = substr($encryptedData, $ivLen);
        $decryptedStr  = openssl_decrypt($encryptedStr, self::$method, $aesKey, OPENSSL_RAW_DATA, $iv);
        return $decryptedStr;
    }
}