Question

我有一个小应用程序，其中读取任何文件（即.exe，.jpg，.img和所有其他文件），通过bytes[]将其传输到File.ReadAllBytes()，用3DES加密并保存File.WriteAllBytes()。比有解密方法做同样的反向。我的问题是，一切都工作正常，高达300MB原始文件，比我的内存异常。有什么建议如何解决这个问题？如何处理文件＆gt; 1GB？它可以帮助使用streamreader或cryptostream读写器吗？

阅读和加密文件：

 try
 {
     saveFileDialog1.FileName = "";
     DialogResult result = openFileDialog1.ShowDialog();
     if (result == DialogResult.OK) 
     {
         byte[] Results;
         System.Text.UTF8Encoding UTF8 = new System.Text.UTF8Encoding();
         fileToEncrypt = File.ReadAllBytes(openFileDialog1.FileName);
         MD5CryptoServiceProvider HashProvider = new MD5CryptoServiceProvider();
         byte[] TDESKey = HashProvider.ComputeHash(UTF8.GetBytes(textBox1.Text));
         TripleDESCryptoServiceProvider TDESAlgorithm = new TripleDESCryptoServiceProvider();
         TDESAlgorithm.Key = TDESKey;
         TDESAlgorithm.Mode = CipherMode.ECB;
         TDESAlgorithm.Padding = PaddingMode.PKCS7;
         ICryptoTransform Encryptor = TDESAlgorithm.CreateEncryptor();
         Results = Encryptor.TransformFinalBlock(fileToEncrypt, 0, fileToEncrypt.Length);
         saveFileDialog1.FileName = openFileDialog1.SafeFileName;
         saveFileDialog1.ShowDialog();
         if (saveFileDialog1.FileName != "")
         {
             File.WriteAllBytes(saveFileDialog1.FileName, Results);
         }
         TDESAlgorithm.Clear();
         HashProvider.Clear();
     }
 }
 catch
 {
     MessageBox.Show("Your system has not enough memory.", "", MessageBoxButtons.OK, MessageBoxIcon.Error);
 }

解密和保存：

 try
 {
     openFileDialog1.FileName = "";
     DialogResult result = openFileDialog1.ShowDialog();
     if (result == DialogResult.OK) // Test result.
     {
         byte[] Results;
         System.Text.UTF8Encoding UTF8 = new System.Text.UTF8Encoding();
         fileToDecrypt = File.ReadAllBytes(openFileDialog1.FileName);
         MD5CryptoServiceProvider HashProvider = new MD5CryptoServiceProvider();
         byte[] TDESKey = HashProvider.ComputeHash(UTF8.GetBytes(textBox1.Text));
         TripleDESCryptoServiceProvider TDESAlgorithm = new TripleDESCryptoServiceProvider();
         TDESAlgorithm.Key = TDESKey;
         TDESAlgorithm.Mode = CipherMode.ECB;
         TDESAlgorithm.Padding = PaddingMode.PKCS7;
         ICryptoTransform Decryptor = TDESAlgorithm.CreateDecryptor();
         Results = Decryptor.TransformFinalBlock(fileToDecrypt, 0, fileToDecrypt.Length);
         saveFileDialog1.FileName = Path.GetFileName(openFileDialog1.FileName);
         saveFileDialog1.ShowDialog();
         if (saveFileDialog1.FileName != "")
         {
             File.WriteAllBytes(saveFileDialog1.FileName, Results);
         }
         TDESAlgorithm.Clear();
         HashProvider.Clear();
     }
 }
 catch 
 {
     MessageBox.Show("Master password is wrong", "", MessageBoxButtons.OK, MessageBoxIcon.Error);
 }

我只是爱好编码器，所以我为我的代码祈祷一些仁慈：）

textbox1.Text是主密码。

Answer 1

最后我有一些使用cryptostream的东西 - 在我的笔记本上8分钟加密2,7GB文件。感谢Magnus的努力，我也会尝试你的代码

加密方法

DialogResult result = openFileDialog1.ShowDialog();
        if (result == DialogResult.OK) 
        {
            saveFileDialog1.FileName = openFileDialog1.SafeFileName;
            saveFileDialog1.ShowDialog();
            FileStream readFile = new FileStream(openFileDialog1.FileName, FileMode.Open, FileAccess.Read);
            FileStream writeFile = new FileStream(saveFileDialog1.FileName, FileMode.OpenOrCreate, FileAccess.Write);
            writeFile.SetLength(0);

            byte[] storage = new byte[100];
            long fileWritten = 0;
            long totlen = readFile.Length;
            int bytesToWrite;

            System.Text.UTF8Encoding UTF8 = new System.Text.UTF8Encoding();
            MD5CryptoServiceProvider HashProvider = new MD5CryptoServiceProvider();
            byte[] TDESKey = HashProvider.ComputeHash(UTF8.GetBytes(textBox1.Text));
            TripleDESCryptoServiceProvider TDES = new TripleDESCryptoServiceProvider();
            TDES.Key = TDESKey;
            TDES.Mode = CipherMode.ECB;
            TDES.Padding = PaddingMode.PKCS7;
            CryptoStream cryptStream = new CryptoStream(writeFile, TDES.CreateEncryptor(), CryptoStreamMode.Write);
            while (fileWritten < totlen)
            {
                bytesToWrite = readFile.Read(storage, 0, 100);
                cryptStream.Write(storage, 0, bytesToWrite);
                fileWritten = fileWritten + bytesToWrite;

            }

            cryptStream.Close();
            TDES.Clear();
            HashProvider.Clear();
        }

使用 TDES.CreateDecryptor()代替 TDES.CreateEncryptor()解密方法相同。我必须说File.ReadAllBytes()和File.WriteAllBytes()比文件300MB大小要快得多。

File.ReadAllBytes（）内存不足异常

1 个答案: