BadData error while during Decryption Plz how to solve this problem

jayabalan07

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 using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.IO;

using System.Security.Cryptography;

using System.Security;

using System.Runtime.InteropServices;

using System.Windows.Forms;
 
namespace cryptography

{

    public partial class CRYPTROGRAPHY : Form

    {

        public CRYPTROGRAPHY()

        {

            InitializeComponent();

        }

        [System.Runtime.InteropServices.DllImport("Kernal32.DLL", EntryPoint = "RTLZeromemory")]

        public static extern bool Zeromemory(IntPtr destination, int length);
 
        public static string Generatekey()

        {

            DESCryptoServiceProvider descrpto = (DESCryptoServiceProvider)DESCryptoServiceProvider.Create();

            return (ASCIIEncoding.ASCII.GetString(descrpto.Key));

        }
 
        public static void  Encrypt(string inputfile, string outputfile, string skey)

        {

            FileStream fileinput = new FileStream(inputfile, FileMode.Open, FileAccess.Read);

            FileStream fileoutput = new FileStream(outputfile, FileMode.Create , FileAccess.Write);

            DESCryptoServiceProvider des = new DESCryptoServiceProvider();

            des.Key = ASCIIEncoding.ASCII.GetBytes(skey);

            des.IV = ASCIIEncoding.ASCII.GetBytes(skey);

            ICryptoTransform descrypt = des.CreateEncryptor();

            CryptoStream cryptostream = new CryptoStream(fileoutput, descrypt, CryptoStreamMode.Write);

            byte[] bytearray = new byte[fileinput.Length];

            fileinput.Read(bytearray, 0, bytearray.Length);

            cryptostream.Write(bytearray, 0, bytearray.Length);

             fileoutput.Close();

         }

        public static void Decrypt(string inputfile, string outputfile, string skey)

        {

            try

            {
 
                FileStream fileoutput = new FileStream(outputfile, FileMode.Open, FileAccess.Write);

                DESCryptoServiceProvider des = new DESCryptoServiceProvider();

                des.Key = ASCIIEncoding.ASCII.GetBytes(skey);

                des.IV = ASCIIEncoding.ASCII.GetBytes(skey);
 
                FileStream fileinput = new FileStream(inputfile, FileMode.Open, FileAccess.Read);

                ICryptoTransform descrypt = des.CreateDecryptor();

                CryptoStream cryptostreamdec = new CryptoStream(fileinput , descrypt, CryptoStreamMode.Read);

                StreamWriter fsdec = new StreamWriter(outputfile);

                fsdec.Write(new StreamReader(cryptostreamdec).ReadToEnd());//Here BADData error 

                fsdec.Flush();

                fsdec.Close();

                MessageBox.Show("Data Decrypted");

            }

            catch (IOException ex)

            {

                MessageBox.Show(ex.ToString());

            }
 
            catch (CryptographicException ex)

            {

                MessageBox.Show(ex.StackTrace);

            }

        }

        //Browse button coding

        private void btn_Browse_Click(object sender, EventArgs e)

        {

            openFileDialog1.Filter = "(.*txt)|*.txt";

            if (openFileDialog1.ShowDialog() == DialogResult.OK)

            {

                txt_Filename.Text = openFileDialog1.FileName;

            }

        }

        //Form Loading 

        private void CRYPTROGRAPHY_Load(object sender, EventArgs e)

        {

            toolStripStatusLabel1.Text = "Select File";

        }

        //Encrypt

        private void btn_Enncrypt_Click(object sender, EventArgs e)

        {

            string mysecretkey = Generatekey();

            txt_Secretkey.Text = mysecretkey;

            Encrypt(txt_Filename.Text , txt_Save.Text , mysecretkey);//call encrypt method

            toolStripStatusLabel1.Text = "Encrypting data";
 
        }
 
        //call decrypt method

        private void btn_Decrypt_Click(object sender, EventArgs e)

        {

            string keyvalue = txt_Secretkey.Text;

            Decrypt(txt_Filename.Text, txt_Save.Text, keyvalue);

        }

    }

}

tlhintoq

TIP: When you are writing your question, there is a button on the tool bar that wraps the [code] tags around your copy/pasted code. It helps a bunch. Its the button with a '#' on it. More on tags. They're cool. Check'em out.

tlhintoq

You're going to have to give the volunteers here a bit more to go on that the entire code for your form.

Like *where* does the program break? On button_encrypt, or decrypt, or when you try to send it an entire file....

On what line does it break, and what is the exact error message you get?

jayabalan07

how to rectify it plz modify this code

tlhintoq

Quote:

Originally Posted by jayabalan07

how to rectify it plz modify this code

Dude, nobody here is going to do your homework for you.

Especially without some more to go on. Please refer to my earlier post that had QUESTIONS FOR YOU in it.

BadData error while during Decryption Plz how to solve this problem

re: BadData error while during Decryption Plz how to solve this problem

re: BadData error while during Decryption Plz how to solve this problem

re: BadData error while during Decryption Plz how to solve this problem

re: BadData error while during Decryption Plz how to solve this problem

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