Meetu's Desk [Meetu Choudhary]

Wednesday, June 17, 2009

Showing Image Dynamically

This piece of code demonstrate that when we take mouse on a particular image the place holder for the image displays the corresponding image... here goes the code

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >

<head>

<title>Meetu Choudhary</title>

`Script for head section`

<script language="javascript" type="text/javascript">

function showimage(imagename)

{

targetimage.src="images/" + imagename;

}

</script>

</head>

Body will have these contents..

<body>

<table width="694" height="525" border="0">

<tr>

<td width="141" height="95" valign="top">

<img src="images/image1.jpg" onmouseover="showimage('image1.jpg')" width="141" height="93">

</td>

<td width="141">

<img src="images/image2.jpg" width="141" height="93" onmouseover="showimage('image2.jpg')">

</td>

<td width="141">

<img src="images/image3.jpg" width="141" height="93" onmouseover="showimage('image3.jpg')">

</td>

<td width="139">

<img src="images/image4.jpg" width="141" height="93" onmouseover="showimage('image4.jpg')">

</td>

<td width="98">

<img src="images/image5.jpg" width="141" height="93" onmouseover="showimage('image5.jpg')">

</td>

</tr>

<tr>

<td height="424"> </td>

<td colspan="3" valign="top">

<img id="targetimage" src="images/image1.jpg" width="420" height="252"/>

</td>

<td> </td>

</tr>

</table>

</body>

</html>

To download the zip folder conating the demo of the article click here

Thanks and Regards

Meetu Choudhary

Thursday, June 11, 2009

Encrypt And Decrypt Using Digital Signatures

Now in continutaion to my earlier artcile the mirroe link of the article here I am going to describe how we can use the digital signatures for the purpose of Encryption and Decryption.

The Following code will show how we can encrypt the plain text.

Encryption

#region Encryption

public string GetEncryptedText(string PlainStringToEncrypt)

{

try

{

string PlainString = PlainStringToEncrypt.Trim();

byte[] cipherbytes = ASCIIEncoding.ASCII.GetBytes(PlainString);

RSACryptoServiceProvider rsa = (RSACryptoServiceProvider)x509_2.PublicKey.Key;

byte[] cipher = rsa.Encrypt(cipherbytes, false);

return Convert.ToBase64String(cipher);

}

catch (Exception e)

{

throw e;

}

}

#endregion

Now once we have encrypted text we need to decrypt it. the following section of code will demonstrate how to decrypt that encrypted text.

Decryption

#region Decryption

public string GetDecryptedText(string EncryptedStringToDecrypt)

{

try

{

try

{

byte[] cipherbytes = Convert.FromBase64String(EncryptedStringToDecrypt);

if (x509_2.HasPrivateKey)

{

RSACryptoServiceProvider rsa = (RSACryptoServiceProvider)x509_2.PrivateKey;

byte[] plainbytes = rsa.Decrypt(cipherbytes, false);

System.Text.ASCIIEncoding enc = new System.Text.ASCIIEncoding();

return enc.GetString(plainbytes);

}

else

{

throw new Exception("Certificate used for has no private key.");

}

}

catch (Exception e)

{

return e.Message;

}

}

catch

{

return EncryptedStringToDecrypt;

}

}

#endregion

Thanks and Regards

Meetu Choudhary

Meetu's Desk [Meetu Choudhary]

Wednesday, June 17, 2009

Showing Image Dynamically

`Script for head section`

Body will have these contents..

Thursday, June 11, 2009

Encrypt And Decrypt Using Digital Signatures

Encrypt And Decrypt Using Digital Signatures

Encryption

Decryption

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