XML encryption - C# Discussion Boards

Re: Changing userControl run time?? [modified]

6-Jun-06 23:33

nafiseh_salmani wrote:
pnl_viewer.Visible=false; //a panel on the usercontrol
pnl_Story.Visible=false;//a panel on the usercontrol
pnl_AuthorName.Visible=true;//a panel on the usercontrol

Use Hide and Show methods instead of Visible.

control.Hide();
control.Show();

Best Regards.

_____________________________
Success is not something to wait for, its something to work for.

Nafiseh Salmani7-Jun-06 0:31

Nafiseh Salmani

7-Jun-06 0:31

thanks, but it dosen't work also!!!

<br />
public void load_html()<br />
{<br />
<br />
//pnl_viewer.Visible=false;<br />
pnl_viewer.Hide();<br />
//pnl_Story.Visible=false;<br />
pnl_Story.Hide();<br />
//pnl_AuthorName.Visible=true;<br />
pnl_AuthorName.Show();<br />
pnl_AuthorName.Location=new Point(8,8);<br />
pnl_viewer.Location=new Point(8,672);<br />
pnl_AuthorName.Update();<br />
pnl_Story.Update();<br />
pnl_viewer.Update();<br />
}

Re: Changing userControl run time?? [modified]

Mairaaj Khan7-Jun-06 20:49

Re: HandleCreated problem

7-Jun-06 20:49

nafiseh_salmani wrote:
pnl_viewer.Hide();pnl_viewer.Location=new Point(8,672);

Why you are setting its location after hiding it? Well! i checked it with the same location value and after showing the panel with show() method, obviously, it was not in front of my eyes because of its y's value that is 672.

I checked it again, and here is the tested code.

private void button1_Click(object sender, EventArgs e)
{
/* panel1.Hide();
panel1.Location = new Point(8,333);
//////both are working in my form.
*/
this.unload();
}
public void unload()
{
this.panel1.Hide();
}
private void button2_Click(object sender, EventArgs e)
{
this.panel1.Show();
this.textBox1.Text = "hello";
}
try to check your code regarding panels.

Best Regards.

_____________________________
Success is not something to wait for, its something to work for.

HandleCreated problem

sianatia6-Jun-06 22:14

sianatia

6-Jun-06 22:14

Hi,
I want to make a control invisible during handle creation but it doesn't work,eventhough i check the visible property and it is false.
What should i do?

Mairaaj Khan6-Jun-06 23:27

Re: Rich Text Box Questions

6-Jun-06 23:27

UAU wrote:
I want to make a control invisible

Use
Control.Hide();

Best Regards.

_____________________________
Success is not something to wait for, its something to work for.

XML encryption

engsrini6-Jun-06 22:09

engsrini

6-Jun-06 22:09

Dear all,

Finally i found some solution to encrypt XML file. instead of encrypting the whole file iam encrypting the Outer XML string alone and writing string again into the file.

Here iam calculating the CRC for the bytes and iam appending it to end of XML as a separate tag. so whenever i load the XML i will calcualte CRC and compare it with tag value If both are same then the XML file is not corrupted else the file is corrupted. here i have an issue, suppose the user changed the tag. then the XML document throws the error that unformatted document. so i can't check value of CRC since i can't read the CRC value from XML. Can anyone please pointout some other idea here.

Thanks and Regards
Srini

Rich Text Box Questions

Peter Sbarski6-Jun-06 21:09

Peter Sbarski

6-Jun-06 21:09

I am working on an application with a rich text box and I am starting to go crazy.

Here’s what I need to do:

* Set the width of the text box to the width of the widest string.
* Get the height of the text box given a particular width so that all text fits in and there are no vertical or horizontal gaps (i.e. tightest configuration) and no scroll bars.
* Get the next narrowest/widest configuration of the text box which has one less or one more line.

I have tried using MeasureString (with GenericTypographic and GenericDefault), I have tried using SetMeasureableCharactersRanges, I have tried counting pixels, I have tried enabling anti-aliasing and smoothing text, I feel that I have tried everything.

Unfortunately it seems that when I measure strings and then use these measurements with the text box, they mismatch.

For example, my text measuring function tells me that the width of the longest word is 10. However, when I set the width of the text box to 10 it turns out to be too small.

To make it right I have to add a fudge factor. Unfortunately it seems that for different strings the amount that I need to add varies. Sometimes it can be 1, sometimes it can be 10.

I am aware of the issues between GDI and GDI+ but is there nothing one can do?

Any help/suggestions would be greatly appreciated.

Thanks.

Mairaaj Khan6-Jun-06 21:50

Using TripleDES Encryption [modified]

6-Jun-06 21:50

tech_01 wrote:
To make it right I have to add a fudge factor. Unfortunately it seems that for different strings the amount that I need to add varies. Sometimes it can be 1, sometimes it can be 10.

Have you tried to calculate the Average space required by each character in the text box?
if this idea works then please! let me to know.
Thanks and
Best Regards.

_____________________________
Success is not something to wait for, its something to work for.

cybersurferdev6-Jun-06 20:45

6-Jun-06 20:45

Hi All

I need to use TripleDES encyption for my Web Application. I want to store the key used for encryption in the web.config file. How would I go about choosing a key, storing the key in the web.config, retrieving the key for encryption and decryption, and then doing the encryption itself. I'm relatively new at doing cryptography in C#.

Thanks Smile | :)

-- modified at 2:46 Wednesday 7th June, 2006

stancrm6-Jun-06 21:21

stancrm

6-Jun-06 21:21

You can see the sample from microsoft in your visual studio directory.
C:\Program Files\Microsoft Visual Studio .NET 2003\SDK\v1.1\QuickStart\howto\samples\cryptography\fileencrypt\cs

cybersurferdev6-Jun-06 21:38

6-Jun-06 21:38

I don't want to read data in from a file, then encrypt and decrypt it. I want to retrieve a value from the HTTP HEADERS and encrypt that, then redirect from that page with the ecrypted value appended to the URL and decrypt it on another page.

Kodanda Pani6-Jun-06 21:31

6-Jun-06 21:31

Hi,

You can use the following code.

TripleDESCryptoServiceProvider provider = null;
MemoryStream ms= null;
CryptoStream cs = null;
StreamWriter sw = null;

try
{
provider = new TripleDESCryptoServiceProvider();
ms = new MemoryStream();
cs = new CryptoStream(ms,provider.CreateEncryptor(Key,Vector),CryptoStreamMode.Write);
sw = new StreamWriter(cs);
sw.Write(strValue);
sw.Flush();
cs.FlushFinalBlock();
ms.Flush();
}
catch(Exception)
{
//do exception handling

}
finally
{
sw.Close();
cs.Close();
ms.Close();
}

Guess this will help you.

Regards,
Mahen

cybersurferdev6-Jun-06 21:42

6-Jun-06 21:42

That's great, thank you. But I would like to use keys (validationKey and decryptionKey) stored in my web.config file. Also, I want to retrieve a value from the HTTP HEADERS and encrypt that. Then append the encrypted string to a URL and redirect to another page and decrypt it there.

Kodanda Pani6-Jun-06 22:10

6-Jun-06 22:10

Hi,

If you want you can store the keys in web.config or else you can use registry etc. Store them as strings and covert them to Byte array while doing the encryption.

private static void GetKeys(byte[] Key, byte[] Vector)
{
string[] keystring;
string[] vectorstring;
byte[] intKey = new byte[24];
byte[] intVector = new byte[7];

strKey = System.Configuration.ConfigurationSettings.AppSettings["Key"];
strVector = System.Configuration.ConfigurationSettings.AppSettings["Vector"];
keystring = strKey.Split(new char[]{','});

vectorstring= strVector.Split(new char[]{','});
//build the keys
for(int i=0; i<23; i++)
{
intKey[i] = Convert.ToByte(strKey[i]);

}
for(int i=0; i<7; i++)
{
intVector[i] = Convert.ToByte(strVector[i]);
}
byte[] intLocalKey = {intKey[0], intKey[1], intKey[2], intKey[3], intKey[4], intKey[5], intKey[6], intKey[7], intKey[8], intKey[9], intKey[10], intKey[11], intKey[12], intKey[13], intKey[14], intKey[15], intKey[16], intKey[17], intKey[18], intKey[19], intKey[20], intKey[21], intKey[22], intKey[23]};
byte[] intLocalVec = {intVector[0], intVector[1], intVector[2], intVector[3], intVector[4], intVector[5], intVector[6], intVector[7]};
Key = intLocalKey;
Vector = intLocalVec;
}

Regards,
Mahen

cybersurferdev6-Jun-06 22:49

6-Jun-06 22:49

Thanks so much, you've been a really great help. But one last thing, what does the size of the Initialisation vector need to be and what characters may it store? Cos I need this for the web.config too.

Kodanda Pani7-Jun-06 0:03

7-Jun-06 0:03

Hi,

The size is 7. Its there in the declration of the array.

Regards,
Mahen

cybersurferdev6-Jun-06 23:32

6-Jun-06 23:32

What is the StrValue that you pass to the streamwriter?

Kodanda Pani7-Jun-06 0:04

7-Jun-06 0:04

Hi,

strValue is the text that needs to be encrypted.

Regards,
Mahen

cybersurferdev7-Jun-06 0:10

7-Jun-06 0:10

Can I not convert the string to a byte array and then pass it to the memorystream? Won't this work too? How do I retrieve the encrypted string once the process is complete?

Kodanda Pani7-Jun-06 0:20

7-Jun-06 0:20

Hi,

In the code used to encrypt add the following statement to get the encrypted text into a string variable strRtnvalue.

strRtnvalue = Convert.ToBase64String(ms.GetBuffer(),0,Convert.ToInt32(ms.Length));

Regards,
Mahen

cybersurferdev7-Jun-06 1:45

7-Jun-06 1:45

What text encoding must be used for the byte arrays? I'm using the UniCodeEncoding. But I keep getting an error that the key length is wrong for this algorithm. But my key is 48characters in length and the IV is 16cahracters in length.