填充无效，无法删除 [英] Padding is invalid and cannot be removed

问题描述

首先，我知道还有很多其他线程，我已经研究了它们并尝试了他们的建议，但到目前为止没有一个起作用，所以我开始了我自己的线程. /p>

我的程序需要从文本框中获取一个字符串并对其进行加密.稍后，它将被另一个Rijndael对象解密.

我确保2个rijndael对象使用相同的密钥和IV，设置了Padding属性，并且两者都相同，甚至设置了密码模式.尽管有所有这些，我仍然在"cs.FlushFinalBlock();"中收到填充无效且无法删除"错误 解密方法.

这是代码:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Security.Cryptography;
using System.IO;


namespace Encrypt
{
  public partial class Form1 : Form
  {
    public Form1()
    {
      InitializeComponent();
    }

    //ENCRYPT BUTTON IS CLICKED
    private void btnEncrypt_Click(object sender, EventArgs e)
    {
      string input = tbxInput.Text.Trim();
      string pwd = "password";
      string salt = "234LKJawenHK45ddI91L";

      pwd += salt;
      byte[] pwdArr = Encoding.Unicode.GetBytes(pwd.ToCharArray());
      byte[] saltArr = Encoding.Unicode.GetBytes(salt.ToCharArray());
      byte[] inputArr = Encoding.Unicode.GetBytes(input.ToCharArray());
      //byte[] inputArr = Convert.FromBase64String(input);

      PasswordDeriveBytes pdb = new PasswordDeriveBytes(pwdArr, saltArr);
      RijndaelManaged eRijndael = new RijndaelManaged();
      eRijndael.Mode = CipherMode.CBC;
      eRijndael.Padding = PaddingMode.PKCS7;
      eRijndael.Key = pdb.GetBytes(32);
      eRijndael.IV = pdb.GetBytes(16);
      eRijndael.BlockSize = 128;

      MemoryStream ms = new MemoryStream();
      CryptoStream cs = new CryptoStream(ms, eRijndael.CreateEncryptor(eRijndael.Key, eRijndael.IV), CryptoStreamMode.Write);
      cs.Write(inputArr, 0, inputArr.Length);
      cs.FlushFinalBlock();
      cs.Close();

      tbxEncrypted.Text = Convert.ToBase64String(ms.ToArray());
      ms.Close();
      eRijndael.Clear();
    }


    //DECRYPT BUTTON CLICKED
    private void btnDecrypt_Click(object sender, EventArgs e)
    {
      string input = tbxEncrypted.Text.Trim();
      string pwd = "password";
      string salt = "234LKJawenHK45ddI91L";

      //byte[] inputArr = Convert.FromBase64String(input);
      byte[] inputArr = Encoding.Unicode.GetBytes(input);
      byte[] pwdArr = Encoding.Unicode.GetBytes(pwd);
      byte[] saltArr = Encoding.Unicode.GetBytes(salt);

      PasswordDeriveBytes pdb = new PasswordDeriveBytes(pwdArr, saltArr);

      RijndaelManaged dRijndael = new RijndaelManaged();
      dRijndael.Mode = CipherMode.CBC;
      dRijndael.Padding = PaddingMode.PKCS7;
      dRijndael.Key = pdb.GetBytes(32);
      dRijndael.IV = pdb.GetBytes(16);
      dRijndael.BlockSize = 128;

      MemoryStream ms = new MemoryStream();
      CryptoStream cs = new CryptoStream(ms, dRijndael.CreateDecryptor(dRijndael.Key, dRijndael.IV), CryptoStreamMode.Write);
      cs.Write(inputArr, 0, inputArr.Length);
      cs.FlushFinalBlock();
      cs.Close();

      tbxDecrypted.Text = Convert.ToBase64String(ms.ToArray());
      ms.Close();
      dRijndael.Clear();
    }
  }
}

解决方案

是否已在调试模式下运行此程序... ... ???

只要看看错误出现在哪里并尝试找出原因〜

First of all, I'm aware there are many other threads out there and i have looked at them and have tried their recommendations and none have worked so far so i'm starting my own thread. 

My program needs to take a string from a textbox and encrypt it.  Later, it will be decrypted by a different Rijndael object.

I've made sure the 2 rijndael objects use the same key and IV, the Padding property is set and identical for both, and even the cipher mode is set.  Despite all of that I still get a "Padding is invalid and cannot be removed" error on 'cs.FlushFinalBlock();' in the decryption method.

Here's the code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Security.Cryptography;
using System.IO;


namespace Encrypt
{
  public partial class Form1 : Form
  {
    public Form1()
    {
      InitializeComponent();
    }

    //ENCRYPT BUTTON IS CLICKED
    private void btnEncrypt_Click(object sender, EventArgs e)
    {
      string input = tbxInput.Text.Trim();
      string pwd = "password";
      string salt = "234LKJawenHK45ddI91L";

      pwd += salt;
      byte[] pwdArr = Encoding.Unicode.GetBytes(pwd.ToCharArray());
      byte[] saltArr = Encoding.Unicode.GetBytes(salt.ToCharArray());
      byte[] inputArr = Encoding.Unicode.GetBytes(input.ToCharArray());
      //byte[] inputArr = Convert.FromBase64String(input);

      PasswordDeriveBytes pdb = new PasswordDeriveBytes(pwdArr, saltArr);
      RijndaelManaged eRijndael = new RijndaelManaged();
      eRijndael.Mode = CipherMode.CBC;
      eRijndael.Padding = PaddingMode.PKCS7;
      eRijndael.Key = pdb.GetBytes(32);
      eRijndael.IV = pdb.GetBytes(16);
      eRijndael.BlockSize = 128;

      MemoryStream ms = new MemoryStream();
      CryptoStream cs = new CryptoStream(ms, eRijndael.CreateEncryptor(eRijndael.Key, eRijndael.IV), CryptoStreamMode.Write);
      cs.Write(inputArr, 0, inputArr.Length);
      cs.FlushFinalBlock();
      cs.Close();

      tbxEncrypted.Text = Convert.ToBase64String(ms.ToArray());
      ms.Close();
      eRijndael.Clear();
    }


    //DECRYPT BUTTON CLICKED
    private void btnDecrypt_Click(object sender, EventArgs e)
    {
      string input = tbxEncrypted.Text.Trim();
      string pwd = "password";
      string salt = "234LKJawenHK45ddI91L";

      //byte[] inputArr = Convert.FromBase64String(input);
      byte[] inputArr = Encoding.Unicode.GetBytes(input);
      byte[] pwdArr = Encoding.Unicode.GetBytes(pwd);
      byte[] saltArr = Encoding.Unicode.GetBytes(salt);

      PasswordDeriveBytes pdb = new PasswordDeriveBytes(pwdArr, saltArr);

      RijndaelManaged dRijndael = new RijndaelManaged();
      dRijndael.Mode = CipherMode.CBC;
      dRijndael.Padding = PaddingMode.PKCS7;
      dRijndael.Key = pdb.GetBytes(32);
      dRijndael.IV = pdb.GetBytes(16);
      dRijndael.BlockSize = 128;

      MemoryStream ms = new MemoryStream();
      CryptoStream cs = new CryptoStream(ms, dRijndael.CreateDecryptor(dRijndael.Key, dRijndael.IV), CryptoStreamMode.Write);
      cs.Write(inputArr, 0, inputArr.Length);
      cs.FlushFinalBlock();
      cs.Close();

      tbxDecrypted.Text = Convert.ToBase64String(ms.ToArray());
      ms.Close();
      dRijndael.Clear();
    }
  }
}

解决方案

Have you run this in Debug Mode......???

just see where the error show up and try to find the cause~

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