使用rijndeal算法解密会产生填充错误

Question

我正在使用rijndeal来加密和解密一些数据！但它给了我这个错误：

Padding is invalid and cannot be removed.

我搜索了很多，但没有什么能帮我解决这个错误！ 这是我的加密/解密代码：

public string Encrypt(string text)
    {

        mainRM = new System.Security.Cryptography.RijndaelManaged();
        mainRM.BlockSize = 256;
        mainRM.KeySize = 256;
        memorystream = new System.IO.MemoryStream();
        ICryptoTransform icrypt = mainRM.CreateEncryptor(key, iv);
        CryptoStream cryptstream = new CryptoStream(memorystream, icrypt, CryptoStreamMode.Write);
        cryptstream.FlushFinalBlock();
        System.IO.StreamWriter sw = new System.IO.StreamWriter(cryptstream);
        sw.Write(text);
        return Convert.ToBase64String(memorystream.ToArray());
    }

    public string Decrypt(string CryptedText)
    {
        string custinfo;
        System.IO.StreamReader streamreader;
        mainRM = new RijndaelManaged();
        mainRM.BlockSize = 256;
        mainRM.KeySize = 256;
        memorystream = new System.IO.MemoryStream(Convert.FromBase64String(CryptedText));
        ICryptoTransform icrypt = mainRM.CreateDecryptor(key, iv);
        memorystream.Position = 0;
        CryptoStream cryptstream = new CryptoStream(memorystream, icrypt, CryptoStreamMode.Read);
        cryptstream.FlushFinalBlock();
        streamreader = new System.IO.StreamReader(cryptstream);
        custinfo = streamreader.ReadToEnd();
        return custinfo;
    }

任何人都可以帮助我吗？

Answer 1

将解密端设置为无填充。解密并查看您添加到明文末尾的内容。这将告诉您加密端添加的填充。更改加密端以显式设置该填充并更改解密端以明确期望相同的填充。

或者将两者都设置为PKCS7（aka PKCS5）填充。你需要在两侧都有相同的填充。