InitializeBinding Method

Imports Leadtools 
Imports Leadtools.Ccow 
Imports Leadtools.Ccow.UI 
 
Public Sub SecureBinding() 
   Dim contextManager As IContextManager = Utils.COMCreateObject(Of IContextManager)(CcowProgId) 
   Dim participant As SecureParticipant = New SecureParticipant() 
   Dim secure As ISecureBinding = TryCast(contextManager, ISecureBinding) 
   Dim coupon As Integer = 0 
 
   Try 
      Dim binderPublicKey As String = String.Empty 
      Dim mac As String = String.Empty, hash As String 
      Dim access As Object 
 
      coupon = contextManager.JoinCommonContext(participant, ApplicationName, True, False) 
 
      ' 
      ' Bind securely context manager 
      ' 
      mac = secure.InitializeBinding(coupon, Leadtools.Ccow.Constants.PassCodeNames, Leadtools.Ccow.Constants.PassCodeValues, binderPublicKey) 
      hash = Utils.BinaryEncode(Utils.Hash(binderPublicKey & SecureParticipant.Passcode)) 
      Debug.Assert(mac.ToLower() = hash.ToLower()) 
 
      ' 
      ' Create participant mac and finalize binding 
      ' 
      mac = Utils.BinaryEncode(Utils.Hash(participant.PublicKey + SecureParticipant.Passcode)) 
      access = secure.FinalizeBinding(coupon, participant.PublicKey, mac) 
 
      ' 
      ' Display access 
      ' 
      If Not access Is Nothing Then 
         Dim a As String() = CType(access, String()) 
 
         Dim i As Integer = 0 
         Do While i < a.Length 
            Debug.WriteLine(String.Format("     {0}" & Microsoft.VisualBasic.Constants.vbTab & "{1}", a(i), a(i + 1))) 
            i += 2 
         Loop 
      End If 
      SetUserContext(contextManager, participant, coupon) 
      contextManager.LeaveCommonContext(coupon) 
   Catch e As Exception 
      Debug.WriteLine(e.Message) 
   End Try 
End Sub 
 
Private Sub SetUserContext(ByVal contextManager As IContextManager, ByVal participant As SecureParticipant, ByVal coupon As Integer) 
   Dim secure As ISecureContextData = TryCast(contextManager, ISecureContextData) 
   Dim userSubject As Subject = New Subject("User") 
   Dim transactionCoupon As Integer = 0 
   Dim noContinue As Boolean = True, disconnect As Boolean = False 
   Dim reasons As Object 
   Dim decision As String = "accept" 
 
   userSubject.Items.Add(New ContextItem("User.id.logon")) 
   userSubject.Items(0).Value = "test" 
   userSubject.Items.Add(New ContextItem("User.co.Name")) 
   userSubject.Items(1).Value = "Test User" 
 
   Try 
      Dim messageDigest, appSignature As String 
      Dim values As List(Of String) = New List(Of String)() 
 
      For Each v As Object In userSubject.ToItemValueArray() 
         values.Add(v.ToString()) 
      Next v 
 
      transactionCoupon = contextManager.StartContextChanges(coupon) 
 
      ' 
      ' Create digital signature 
      ' 
      messageDigest = coupon.ToString() & String.Join("", userSubject.ToItemNameArray()) + String.Join("", values.ToArray()) + transactionCoupon.ToString() 
      appSignature = participant.CreateSignature(messageDigest) 
 
      secure.SetItemValues(coupon, userSubject.ToItemNameArray(), userSubject.ToItemValueArray(), transactionCoupon, appSignature) 
      reasons = contextManager.EndContextChanges(transactionCoupon, noContinue) 
 
      ' 
      ' If any application responded that they cannot apply the change we need to display 
      ' a dialog that displays the reasons for the problems. 
      ' 
      If (Not reasons Is Nothing AndAlso (CType(reasons, String())).Length > 0) OrElse noContinue Then 
         Dim pd As ProblemDialog = New ProblemDialog(CType(reasons, String()), noContinue) 
         Dim result As DialogResult 
 
         result = pd.ShowDialog() 
         If noContinue Then 
            decision = "cancel" 
         End If 
         If result = System.Windows.Forms.DialogResult.OK Then 
            decision = "accept" 
         ElseIf result = DialogResult.Cancel Then 
            decision = "cancel" 
         Else 
            decision = "cancel" 
            disconnect = True 
         End If 
      End If 
 
      ' 
      ' If user decided to break context we must leave 
      ' 
      contextManager.PublishChangesDecision(transactionCoupon, decision) 
      If disconnect Then 
         contextManager.LeaveCommonContext(coupon) 
      End If 
 
   Catch e As Exception 
      Debug.WriteLine(e.Message) 
   End Try 
 
End Sub 
 
<ComVisible(True)> 
Public Class SecureParticipant 
   Implements IContextParticipant 
 
   Public Const Passcode As String = "A2C053FC-182C-4167-BB56-EE394BC5DB05" 
   Public Const ApplicationName As String = "LEADTOOLS CCOW App" 
 
   Private _KeyContainer As KeyContainer = Nothing 
 
   Public ReadOnly Property PublicKey() As String 
      Get 
         If Not _KeyContainer Is Nothing Then 
            Return Utils.BinaryEncode(_KeyContainer.GetPublicKey()) 
         End If 
         Return String.Empty 
      End Get 
   End Property 
 
   Public Sub New() 
      _KeyContainer = New KeyContainer(ApplicationName) 
   End Sub 
 
   Public Function CreateSignature(ByVal messageDigest As String) As String 
      Dim signature As Byte() = _KeyContainer.Sign(messageDigest) 
 
      Return Utils.BinaryEncode(signature) 
   End Function 
 
   Public Sub CommonContextTerminated() Implements IContextParticipant.CommonContextTerminated 
      Console.WriteLine("CommonContextTerminated") 
   End Sub 
 
   Public Sub ContextChangesAccepted(ByVal contextCoupon As Integer) Implements IContextParticipant.ContextChangesAccepted 
      Console.WriteLine("ContextChangesAccepted") 
   End Sub 
 
   Public Sub ContextChangesCanceled(ByVal contextCoupon As Integer) Implements IContextParticipant.ContextChangesCanceled 
      Console.WriteLine("ContextChangesCanceled") 
   End Sub 
 
   Public Function ContextChangesPending(ByVal contextCoupon As Integer, ByRef reason As String) As String Implements IContextParticipant.ContextChangesPending 
      reason = String.Empty 
      Console.WriteLine("ContextChangesPending") 
      Return "accept" 
   End Function 
 
   Public Sub Ping() Implements IContextParticipant.Ping 
   End Sub 
 
 
End Class