文件加密和解密c＃Rijndael密码 [英] file encryption and decryption c# Rijndael cipher

问题描述

  private void btnEncrypt_Click（object sender ，EventArgs e）
 {
 // EncryptFile（）; 
 try 
 {
 OpenFileDialog dialog = new OpenFileDialog（）; 
 dialog.Filter =所有文件（*。*）|; 
 dialog.InitialDirectory = @桌面; 
 dialog.Title =请选择要加密的文件。 
 
 dialog.ShowDialog（）; 
 
 inputFile = dialog.FileName; 
 
 outputFile = inputFile; 
 
 string password = @myKey123; //你的钥匙
 UnicodeEncoding UE = new UnicodeEncoding（）; 
 byte [] key = UE.GetBytes（password）; 
 
 string cryptFile = outputFile; 
 FileStream fsCrypt = new FileStream（cryptFile，FileMode.Create）; 
 
 RijndaelManaged RMCrypto = new RijndaelManaged（）; 
 
 CryptoStream cs = new CryptoStream（fsCrypt，
 RMCrypto.CreateEncryptor（key，key），
 CryptoStreamMode.Write）; 
 
 FileStream fsIn = new FileStream（inputFile，FileMode.Open，FileAccess.Read，FileShare.ReadWrite）; 
 
 int数据; 
 while（（data = fsIn.ReadByte（））！= -1）
 cs.WriteByte（（byte）data）; 
 
 
 fsIn.Close（）; 
 cs.Close（）; 
 fsCrypt.Close（）; 
} 
 catch（Exception ex）
 {
 MessageBox.Show（ex.Message）; 
} 
  

这个功能很好，但是当我尝试解密相同的文本文件时，没有任何错误信息让我知道发生了什么，我使用以下代码进行解密

  private void btnDecrypt_Click（object发件人，EventArgs e）
 {
 try 
 {
 OpenFileDialog dialog = new OpenFileDialog（）; 
 dialog.Filter =所有文件（*。*）|; 
 dialog.InitialDirectory = @桌面; 
 dialog.Title =请选择要解密的文件。 
 
 dialog.ShowDialog（）; 
 
 inputFile = dialog.FileName; //C：\\Users\\daniel\\Desktop\\text.txt; 
 outputFile = inputFile; 
 
 
 string password = @myKey123; //您的密钥
 
 UnicodeEncoding UE = new UnicodeEncoding（）; 
 byte [] key = UE.GetBytes（password）; 
 
 FileStream fsCrypt = new FileStream（inputFile，FileMode.Open）; 
 
 RijndaelManaged RMCrypto = new RijndaelManaged（）; 
 
 CryptoStream cs = new CryptoStream（fsCrypt，
 RMCrypto.CreateDecryptor（key，key），
 CryptoStreamMode.Read）; 
 
 FileStream fsOut = new FileStream（outputFile，FileMode.Open，FileAccess.Read，FileShare.ReadWrite）; 
 
 int数据; 
 while（（data = cs.ReadByte（））！= -1）
 fsOut.WriteByte（（byte）data）; 
 
 fsOut.Close（）; 
 cs.Close（）; 
 fsCrypt.Close（）; 
 
} 
 catch（Exception ex）
 {
 MessageBox.Show（ex.Message）; 
} 
 
} 
} 
  

帮助？

解决方案

fsOut 作为只读流打开。

  FileStream fsOut = new FileStream（
 outputFile，
 FileMode.Open，
 FileAccess.Write，
 FileShare.ReadWrite）; 
  

注意：我也会写入一个临时文件并复制原始的，当我完成，但我没有一个很好的的原因。

I can encrypt a text file that is located on my desktop using the following code.

 private void btnEncrypt_Click(object sender, EventArgs e)
    {
        //EncryptFile(); 
        try
        {
            OpenFileDialog dialog = new OpenFileDialog();
            dialog.Filter = "All Files (*.*)|";
            dialog.InitialDirectory = @"Desktop";
            dialog.Title = "Please select a file to encrypt.";

            dialog.ShowDialog();

            inputFile = dialog.FileName;

            outputFile = inputFile;

            string password = @"myKey123"; // Your Key Here
            UnicodeEncoding UE = new UnicodeEncoding();
            byte[] key = UE.GetBytes(password);

            string cryptFile = outputFile;
            FileStream fsCrypt = new FileStream(cryptFile, FileMode.Create);

            RijndaelManaged RMCrypto = new RijndaelManaged();

            CryptoStream cs = new CryptoStream(fsCrypt,
                RMCrypto.CreateEncryptor(key, key),
                CryptoStreamMode.Write);

            FileStream fsIn = new FileStream(inputFile, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);

            int data;
            while ((data = fsIn.ReadByte()) != -1)
                cs.WriteByte((byte)data);


            fsIn.Close();
            cs.Close();
            fsCrypt.Close();
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }

this works great but when i try to decrypt the same text file nothing happens, no error message is thrown to let me know what is going on, i use the following code for decryption

private void btnDecrypt_Click(object sender, EventArgs e)
    {
        try
        {
            OpenFileDialog dialog = new OpenFileDialog();
            dialog.Filter = "All Files (*.*)|";
            dialog.InitialDirectory = @"Desktop";
            dialog.Title = "Please select a file to decrypt.";

            dialog.ShowDialog();

            inputFile = dialog.FileName; // "C:\\Users\\daniel\\Desktop\\text.txt";
            outputFile = inputFile;


                string password = @"myKey123"; // Your Key Here

                UnicodeEncoding UE = new UnicodeEncoding();
                byte[] key = UE.GetBytes(password);

                FileStream fsCrypt = new FileStream(inputFile, FileMode.Open);

                RijndaelManaged RMCrypto = new RijndaelManaged();

                CryptoStream cs = new CryptoStream(fsCrypt,
                    RMCrypto.CreateDecryptor(key, key),
                    CryptoStreamMode.Read);

                FileStream fsOut = new FileStream(outputFile, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);

                int data;
                while ((data = cs.ReadByte()) != -1)
                    fsOut.WriteByte((byte)data);

                fsOut.Close();
                cs.Close();
                fsCrypt.Close();

            }
        catch(Exception ex)
        {
            MessageBox.Show(ex.Message);
        }

        }
    }

can anybody help?

解决方案

fsOut is open as a read-only stream. Try this instead.

 FileStream fsOut = new FileStream(
       outputFile, 
       FileMode.Open, 
       FileAccess.Write, 
       FileShare.ReadWrite);

Note: I would also write to a temp file and copy over the original when completed but I don't have a great reason for it.

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