使用AES 256 C＃php加密和解密非常长的字符串

I got an encrypting function written in PHP which encrypts my data, and a decrypt function in C# which decrypts it and prints on screen(I'm developing a game in Unity engine). So the problem is, if the data string is long it won't decrypt the last part of it... I'm using AES 256 encryption with keyI got an encrypting function written in PHP whi