Binary encryption

[TomB]

Anyone know of an example/tutorial for encrypting a binary file?

I'm able to encrypt/decrypt simple text files, but anything more complicated
craps out.

Thanks
TomB

[James]

Re: Binary encryption

I think there is a class for this in the .Net frame work. I haven't used it
but look in MSDN.


"TomB" <shuckle@hotmai lXXX.com> wrote in message
news:%233Joj4Bn EHA.952@TK2MSFT NGP10.phx.gbl.. .[color=blue]
> Anyone know of an example/tutorial for encrypting a binary file?
>
> I'm able to encrypt/decrypt simple text files, but anything more[/color]
complicated[color=blue]
> craps out.
>
> Thanks
> TomB
>
>[/color]

[Daniel O'Connell [C# MVP]]

Re: Binary encryption


"TomB" <shuckle@hotmai lXXX.com> wrote in message
news:%233Joj4Bn EHA.952@TK2MSFT NGP10.phx.gbl.. .[color=blue]
> Anyone know of an example/tutorial for encrypting a binary file?
>
> I'm able to encrypt/decrypt simple text files, but anything more
> complicated
> craps out.
>[/color]

It shouldn't matter what the contents are. What encryption method are you
using? Can you post a short, but complete program that shows what your
problem is?

[TomB]

Re: Binary encryption

Encrypt and Decrypt are my button names.



RijndaelEnhance d is from

http://www.obviex.com/samples/EncryptionWithSalt.aspx

Thanks

TomB



private void Encrypt_Click(o bject sender, System.EventArg s e)

{

Cursor.Current= Cursors.WaitCur sor;

Encrypt.Text="E ncrypting...";

Encrypt.Refresh ();

string IV;



IV=(Password.Te xt+"01234567890 123456").Substr ing(0,16);


RijndaelEnhance d re=new RijndaelEnhance d(Password.Text ,IV);


StreamReader _sr=new StreamReader(Fi leName.Text);

byte[] byteArray=re.En cryptToBytes(_s r.ReadToEnd());

string encryptedText=C onvert.ToBase64 String(byteArra y);

//string encryptedText=r e.Encrypt(_sr.R eadToEnd());

StreamWriter _sw;

try

{

_sw=new
StreamWriter(En cryptedFileLoca tion.Text,false ,System.Text.En coding.UTF8);


_sw.Write( encryptedText);

//_sw.Write(Conve rt.ToBase64Stri ng(byteArray));

_sw.Flush();

_sw.Close();

MessageBox.Show ("Encrypted File saved as " +
EncryptedFileLo cation.Text,"Fi le
Encrypted",Mess ageBoxButtons.O K,MessageBoxIco n.Information);

}

catch (Exception ex)

{

MessageBox.Show (ex.Message);

}

finally

{

Encrypt.Text="& Encrypt";

Cursor.Current= Cursors.Default ;

}

}

private void Decrypt_Click(o bject sender, System.EventArg s e)

{


try

{

Decrypt.Text="D ecrypting...";

Cursor.Current= Cursors.WaitCur sor;

string IV;

IV=(Password.Te xt+"01234567890 123456").Substr ing(0,16);


RijndaelEnhance d re=new RijndaelEnhance d(Password.Text ,IV);


StreamReader _sr=new
StreamReader(En cryptedFileLoca tion.Text,Syste m.Text.Encoding .UTF8);

string encryptedText=_ sr.ReadToEnd();

string DecryptedText=r e.Decrypt(encry ptedText);

StreamWriter _sw=new
StreamWriter(De cryptedFileLoca tion.Text,false ,System.Text.En coding.UTF8);

_sw.Write(Conve rt.FromBase64St ring(DecryptedT ext));

//_sw.Write(Decry ptedText);

_sw.Flush();

_sw.Close();

MessageBox.Show ("Decrypted File saved as '" + DecryptedFileLo cation.Text +
"'.","File Decrypted",Mess ageBoxButtons.O K,MessageBoxIco n.Information);

}

catch (Exception ex)

{

// I imagine an exception would occur if the password is incorrect

//MessageBox.Show (ex.Message);

MessageBox.Show ("The file '" + EncryptedFileLo cation.Text + "' could not be
decrypted. Please ensure you entered the correct password and filename",

"Unable to decrypt file",

MessageBoxButto ns.OK,

MessageBoxIcon. Warning );

}

finally

{

Decrypt.Text="D ecrypt";

Cursor.Current= Cursors.Default ;

}

}



"Daniel O'Connell [C# MVP]" <onyxkirx@--NOSPAM--comcast.net> wrote in
message news:%23GxTZMCn EHA.596@TK2MSFT NGP11.phx.gbl.. .[color=blue]
>
> "TomB" <shuckle@hotmai lXXX.com> wrote in message
> news:%233Joj4Bn EHA.952@TK2MSFT NGP10.phx.gbl.. .[color=green]
> > Anyone know of an example/tutorial for encrypting a binary file?
> >
> > I'm able to encrypt/decrypt simple text files, but anything more
> > complicated
> > craps out.
> >[/color]
>
> It shouldn't matter what the contents are. What encryption method are you
> using? Can you post a short, but complete program that shows what your
> problem is?
>
>[/color]

[Jon Skeet [C# MVP]]

Re: Binary encryption

TomB <shuckle@hotmai lXXX.com> wrote:[color=blue]
> Encrypt and Decrypt are my button names.[/color]

<snip>

The problem is that you're treating the binary files as if they're text
files. Don't use a StreamReader - just read straight from the stream.

--
Jon Skeet - <skeet@pobox.co m>

http://www.pobox.com/~skeet

If replying to the group, please do not mail me too

[TomB]

Re: Binary encryption

Ah. OK.

Thanks Jon, I'll give that a shot.

Thanks for your help.

TomB

"Jon Skeet [C# MVP]" <skeet@pobox.co m> wrote in message
news:MPG.1bb410 b9a822c85098b43 e@msnews.micros oft.com...[color=blue]
> TomB <shuckle@hotmai lXXX.com> wrote:[color=green]
> > Encrypt and Decrypt are my button names.[/color]
>
> <snip>
>
> The problem is that you're treating the binary files as if they're text
> files. Don't use a StreamReader - just read straight from the stream.
>
> --
> Jon Skeet - <skeet@pobox.co m>
> http://www.pobox.com/~skeet
> If replying to the group, please do not mail me too[/color]