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Windows应用程序窗体，但是问题出在我按下“开始”按钮之后，没有结果显示给我该文件已加密到我选择的新路径。代码内有什么问题吗？

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;
        }
    }
}

}

加密和解密的次要问题

0 个答案: