c# - 加解密小问题

Question

• 这是加密和解密程序 * 在 C# 中，该程序是可行的并且能够执行以弹出一个 Windows 应用程序表单，但问题是在我按下开始按钮之后，没有结果显示文件已被加密到我选择的新路径。代码内部有问题吗？

  using System;
  using System.Collections.Generic;
  using System.ComponentModel;
  using System.Data;
  using System.Drawing;
  using System.Linq;
  using System.Text;
  using System.Threading.Tasks;
  using System.Windows.Forms;
  using System.IO;
  
  namespace Advanced_Encryption_Decryption
  {
      public partial class EncryptDecrypt : Form
  {
      byte[] abc;
      byte[,] table;
  
      public EncryptDecrypt()
      {
          InitializeComponent();
      }
  
      private void btnBrowse_Click(object sender, EventArgs e)
      {
          OpenFileDialog od = new OpenFileDialog();
          od.Multiselect = false;
          if(od.ShowDialog() == DialogResult.OK)
          {
              tbPath.Text = od.FileName;
          }
      }
  
      private void btnEncryption_CheckedChanged(object sender, EventArgs e)
      {
          if(rbEncryption.Checked)
          {
              rbDecryption.Checked = false;
          }
      }
  
      private void btnDecryption_CheckedChanged(object sender, EventArgs e)
      {
          if (rbDecryption.Checked)
              rbEncryption.Checked = false;
      }
  
      private void EncryptDecrypt_Load(object sender, EventArgs e)
      {
          rbEncryption.Checked = true;
  
          //Initialize ABC and Table
          abc = new byte[256];
          for (int i = 0; i < 256; i++)
              abc[i] = Convert.ToByte(i);
  
          table = new byte[256, 256];
          for (int i = 0; i < 256; i++)
              for (int j = 0; j < 256; j++)
              {
                  table[i, j] = abc[(i + j) % 256];
              }
      }
  
      private void btnStart_Click(object sender, EventArgs e)
      {
          //Check Input Values
          if(!File.Exists(tbPath.Text))
          {
              MessageBox.Show("File Does Not Exist");
              return;
          }
  
          if(String.IsNullOrEmpty(tbPassword.Text))
          {
              MessageBox.Show("Password Empty. PLease Enter Your Password");
              return;
          }
  
          //Encryption and Decryption
  
          //Get File Content and Key for Encryption or Decryption
          try
          {
              byte[] fileContent = File.ReadAllBytes(tbPath.Text);
              byte[] passwordTmp = Encoding.ASCII.GetBytes(tbPassword.Text);
              byte[] keys = new byte[fileContent.Length];
              for (int i = 0; i < fileContent.Length; i++)
                  keys[i] = passwordTmp[i % passwordTmp.Length];
  
              //Encryption
              byte[] result = new byte[fileContent.Length];
  
              if (rbEncryption.Checked)
              {
  
                  for (int i = 0; i < fileContent.Length; i++)
                  {
                      byte value = fileContent[i];
                      byte key = keys[i];
                      int valueIndex = -1, keyIndex = -1;
                      for (int j = 0; j < 256; j++)
                          if (abc[j] == value)
                          {
                              valueIndex = j;
                              break;
                          }
                      for (int j = 0; j < 256; j++)
                          if (abc[j] == key)
                          {
                              keyIndex = j;
                              break;
                          }
  
                      result[i] = table[keyIndex, valueIndex];
                  }
              }
              //Decryption
              else
              {
                  for (int i = 0; i < fileContent.Length; i++)
                  {
                      byte value = fileContent[i];
                      byte key = keys[i];
                      int valueIndex = -1, keyIndex = -1;
                      for (int j = 0; j < 256; j++)
                          if (abc[j] == value)
                          {
                              valueIndex = j;
                              break;
                          }
                      for (int j = 0; j < 256; j++)
                          if (table[keyIndex, j] == value)
                          {
                              valueIndex = j;
                              break;
                          }
  
                      result[i] = abc[valueIndex];
                  }
              }
  
              //Save Result to New File with the SAME EXTENTION
              String fileExt = Path.GetExtension(tbPath.Text);
              SaveFileDialog sd = new SaveFileDialog();
              sd.Filter = "Files (*" + fileExt + ") | *" + fileExt;
              if(sd.ShowDialog() == DialogResult.OK)
              {
                  File.WriteAllBytes(sd.FileName, result);
              }
          }
  
          catch
          {
              MessageBox.Show("File is IN USE. Close other program is using 
              this file and TRY AGAIN");
              return;
          }
      }
  }
  

  }

标签： c#encryption