Encryption and Decryption in VB.NET

Encryption and Decryption  in VB.NET

We have to store some data securely, the best method is , convert the values into encryption and then store into database.

To retrieve that data again, convert the values into Decryption

Here is the small example for Encryption and Decryption Class.

 Imports System.IO  
 Imports System.Text  
 Imports System.Security.Cryptography  
 Imports System.Windows.Forms  
 Public Class EncryptDecrypt  
   Private Shared DESProvider As New TripleDESCryptoServiceProvider  
   Private Shared MD5Provider As New MD5CryptoServiceProvider  
   Public Shared Function MD5Hash(ByVal value As String) As Byte()  
     Return MD5Provider.ComputeHash(ASCIIEncoding.ASCII.GetBytes(value))  
   End Function  
   Public Shared Function EncryptString(ByVal stringToEncrypt As String, ByVal key As String) As String  
     DESProvider.Key = Crypto.MD5Hash(key)  
     DESProvider.Mode = CipherMode.ECB  
     Dim Buffer As Byte() = ASCIIEncoding.ASCII.GetBytes(stringToEncrypt)  
     Return Convert.ToBase64String(DESProvider.CreateEncryptor().TransformFinalBlock(Buffer, 0, Buffer.Length))  
   End Function  
   Public Shared Function DecryptString(ByVal encryptedString As String, ByVal key As String) As String  
     Try  
       DESProvider.Key = Crypto.MD5Hash(key)  
       DESProvider.Mode = CipherMode.ECB  
       Dim Buffer As Byte() = Convert.FromBase64String(encryptedString)  
       Return ASCIIEncoding.ASCII.GetString(DESProvider.CreateDecryptor().TransformFinalBlock(Buffer, 0, Buffer.Length))  
     Catch ex As Exception  
       MessageBox.Show("Invalid Key  ", " Decryption Failed", MessageBoxButtons.OK, MessageBoxIcon.Exclamation)  
       Return ""  
     End Try  
   End Function  
 End Class  

How to Use:
1. Add New Class to your vb.net project with the name "EncryptDecrypt"
2. Paste the above code to your new class

You can use this class anywhere in your application

Example

Encryption: - EncryptDecryp.EncryptString("Jyothi","")

Decryption :-EncryptDecryp.DecryptString(Encryptstring,"")