Encrypting & decrypta txt file

[3bood ghzawi]

Hi all... I'm asking of how i can encrypt and decript a txt file using C#, i think u don't mined to help me ... Thank u............... :-D

[Blue_Boy]

Have you search on google?[^]

---

I Love T-SQL "Don't torture yourself,let the life to do it for you." If my post helps you kindly save my time by voting my post. www.aktualiteti.com

[hamed vojdani]

because you want both Encrypting and Decrypting I would offer you gunzipstream

    public string Decode()
    {
        FileStream fs = new FileStream(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments) + "\\\\MyFile.dat", FileMode.Open, FileAccess.ReadWrite);
        byte\[\] array = new byte\[400\];
        GZipStream gstream = new GZipStream(fs, CompressionMode.Decompress);
        gstream.Read(array, 0, array.Length);
        gstream.Close();
        string Mytext = Encoding.UTF8.GetString(array);
        return Mytext;
    }

    public void Encode(string text)
    {
        byte\[\] array = Encoding.UTF8.GetBytes(text);
        FileStream fs = new FileStream(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments) + "\\\\MyFile.dat", FileMode.Create, FileAccess.ReadWrite);
        GZipStream gstream = new GZipStream(fs, CompressionMode.Compress);
        gstream.Write(array, 0, array.Length);
        gstream.Flush();
        gstream.Close();
    }

note: this solution is not completely secure!

[robbrad]

Hi, How could you make this happen on the click of a button? I've tried adding it to the event but the Public void Encode(string text) line obviously stops this happening. edit: Some of my terminology may not be correct, so if your unsure, just ask.

modified on Monday, December 21, 2009 10:41 AM

[hamed vojdani]

just insert button on the form and double click it, Then write button1_Click event code like shown. In this sample I encoded text of TextBox1 to 'Myfile.dat' in My Document note: must copy Encode function to Form class

    private void button1\_Click(object sender, EventArgs e)
    {
        Encode(TextBox1.Text);
    }

    public void Encode(string text)
    {
        byte\[\] array = Encoding.UTF8.GetBytes(text);
        FileStream fs = new FileStream(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments) + "\\\\MyFile.dat", FileMode.Create, FileAccess.ReadWrite);
        GZipStream gstream = new GZipStream(fs, CompressionMode.Compress);
        gstream.Write(array, 0, array.Length);
        gstream.Flush();
        gstream.Close();
    }

modified on Thursday, December 24, 2009 10:23 AM

[robbrad]

I get the following error when my code is run: "The given path's format is not supported." The error is in this line:

FileStream fs = new FileStream(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments) + "MYFILE.txt", FileMode.Create, FileAccess.ReadWrite);

It cant be a problem with my txt file i dont think, because i have used them before in my programs and they have worked fine. Any help would be appreciated. Extra information: - Using VS 2008 - .NET Framework 3.5 SP1

[hamed vojdani]

thanks you forget the "\\" before "MYFILE.txt" corrct that to this:

FileStream fs = new FileStream(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments) + "\\\\MYFILE.txt", FileMode.Create, FileAccess.ReadWrite);

[robbrad]

Thanks for your help so far. Just 1 more question. Ive managed to succesfully encrypt the data that is inputted into textbox1, but decoding it fails.

public Form1()
{
InitializeComponent();
Decode();
}
private void button2_Click(object sender, EventArgs e)

    {
        Decode();

        StreamReader rb = new StreamReader("C:\\\\file.txt");
        MessageBox.Show(rb.ReadToEnd());
        rb.Close();
        
    }
        public string Decode()
    {
        FileStream fs = new FileStream(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments) + "\\\\file.txt", FileMode.Open, FileAccess.ReadWrite);
        byte\[\] array = new byte\[400\];
        GZipStream gstream = new GZipStream(fs, CompressionMode.Decompress);
        gstream.Read(array, 0, array.Length);
        gstream.Close();
        string Mytext = Encoding.UTF8.GetString(array);
        return Mytext;
    }

It doesnt return any errors, it just clears the file. Any help would be appreciated

[robbrad]

Never mind, figured it out. Its amazing what a bit of sleep can do. Thanks