How to do secure encryption and decryption using DOTNET code
Following code will give you the way to do key based encryption and decryption, this code using Dotnet Cryptography class and vb.net. I have tested following code with Dotnet framwork 2.0 and window XP.
Namespace Imports System.Security.Cryptography
Global Variable
'Blow will be the Key to do Encryption and Decryption Private Shared TheKey() As Byte = {&H12, &H34, &H56, &H78, &H9A, &HBC, &HDE, &HFF} Private Shared Vector() As Byte = {&H11, &H22, &H33, &H44, &H55, &H66, &H77, &H88} Encryption Public Shared Function GetEncryptedData(ByVal message As String) As String Dim desServiceProvider As New DESCryptoServiceProvider Dim memoryStream As New MemoryStream Dim in_buf(), out_buf() As Byte 'Check for empty string If message = String.Empty Then Return String.Empty End If ' put the cleartext into the input buffer in_buf = Encoding.ASCII.GetBytes(message) Try 'create an DES Encryptor output stream Dim crStream As New CryptoStream(memoryStream, desServiceProvider.CreateEncryptor(TheKey, Vector), CryptoStreamMode.Write) crStream.Write(in_buf, 0, in_buf.Length) crStream.FlushFinalBlock() ' read the ciphertext into the output array out_buf = memoryStream.ToArray memoryStream.Close() crStream.Close() Catch ex As System.Security.Cryptography.CryptographicException ' if encryption fails,return an empty string Return String.Empty End Try Return Convert.ToBase64String(out_buf) End Function Decryption
Public Shared Function GetDecryptedData(ByVal message As String) As String Dim desServiceProvider As New DESCryptoServiceProvider Dim memoryStream As New MemoryStream Dim in_buf(), out_buf() As Byte 'Check for empty string If message = String.Empty Then Return String.Empty End If ' put the ciphertext into the input buffer Try in_buf = Convert.FromBase64String(message) Catch ex As System.FormatException ' if the string isn't in the correct format, then return empty string Return Return String.Empty End Try Try ' Create an DES Decryptor stream Dim crStream As New CryptoStream(memoryStream, desServiceProvider.CreateDecryptor(TheKey, Vector), CryptoStreamMode.Write) crStream.Write(in_buf, 0, in_buf.Length) crStream.FlushFinalBlock() ' read the cleartext into the output array out_buf = MemoryStream.ToArray MemoryStream.Close() crStream.Close() Catch ex As System.Security.Cryptography.CryptographicException ' if decryption fails, just silently return an empty string Return String.Empty End Try Return Encoding.ASCII.GetString(out_buf) End Function Note: If your project requirement is to do simple encryption decryptions then see below link http://riteshk.blogspot.com/2004/07/how-to-do-encryption-and-decryption.html
If you are using Microsoft enterprise library and your project requirement is very specific to use any standard framework to do encryption and decryption then see following link http://msdn.microsoft.com/en-us/library/cc309163.aspx
If you want to encrypt your app.config file the see following link http://riteshk.blogspot.com/2008/05/programatically-configuration-files.html |
Monday, February 23, 2009
How to do secure encryption and decryption using DOTNET code
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