Encriptar una URL

[hawkwindd]

Hola a todos, gracias por el espacio.

EL caso es que estoy intentando encriptar un parametro en una URL en ASP . NET


En el Evento Click del Hipervinculo:
Response.Redirect("pages/wz.aspx?var1=" & Encrypt(construllepath))


En la funcion de encriptamiento:

Private key() As Byte = {}
Private IV() As Byte = {&H12, &H34, &H56, &H78, &H90, &HAB, &HCD, &HEF}


Public Function Encrypt(ByVal stringToEncrypt As String) As String
Try
key = System.Text.Encoding.UTF8.GetBytes(Left(stringToEn crypt, 8))
Dim des As New DESCryptoServiceProvider()
Dim inputByteArray() As Byte = Encoding.UTF8.GetBytes(stringToEncrypt)
Dim ms As New MemoryStream()
Dim cs As New CryptoStream(ms, des.CreateEncryptor(key, IV), CryptoStreamMode.Write)
cs.Write(inputByteArray, 0, inputByteArray.Length)
cs.FlushFinalBlock()
Return Convert.ToBase64String(ms.ToArray())
Catch e As Exception
Return e.Message
End Try
End Function



En otra pagina recibo y desencripto

'desencripto y meto el resultado en var2
var2 = Decrypt(Request.QueryString("var1"))

'/////////////// Funcion //////////////////

Private key() As Byte = {}
Private IV() As Byte = {&H12, &H34, &H56, &H78, &H90, &HAB, &HCD, &HEF}

Public Function Decrypt(ByVal stringToDecrypt As String) As String
Dim inputByteArray(stringToDecrypt.Length) As Byte
Try
key = System.Text.Encoding.UTF8.GetBytes(Left(stringToDe crypt, 8))
Dim des As New DESCryptoServiceProvider()
inputByteArray = Convert.FromBase64String(stringToDecrypt)
Dim ms As New MemoryStream()
Dim cs As New CryptoStream(ms, des.CreateDecryptor(key, IV), CryptoStreamMode.Write)
cs.Write(inputByteArray, 0, inputByteArray.Length)
cs.FlushFinalBlock()
Dim encoding As System.Text.Encoding = System.Text.Encoding.UTF8
Return encoding.GetString(ms.ToArray())
Catch e As Exception
Return e.Message
End Try
End Function


El resultado es "Datos incorrectos. "



Agradezco sus sugerencias,
Saludos