Public Function GetTlsKeyExchangeAlgorithm( _
   ByVal cipher As DicomTlsCipherSuiteType _
) As DicomTlsExchangeMethodType

Dim instance As DicomNet
Dim cipher As DicomTlsCipherSuiteType
Dim value As DicomTlsExchangeMethodType
 
value = instance.GetTlsKeyExchangeAlgorithm(cipher)

public DicomTlsExchangeMethodType GetTlsKeyExchangeAlgorithm( 
   DicomTlsCipherSuiteType cipher
)

public:
DicomTlsExchangeMethodType GetTlsKeyExchangeAlgorithm( 
   DicomTlsCipherSuiteType cipher
) 

<StructLayout(LayoutKind.Sequential)> _
  Public Structure MSG
      Public hwnd As IntPtr
      Public message As UInteger
      Public wParam As IntPtr
      Public lParam As IntPtr
      Public time As UInteger
      Public p As System.Drawing.Point
  End Structure
  Public Enum WaitReturn
      Complete
      Timeout
  End Enum

  Private Class Utils
      <DllImport("user32.dll")> _
      Shared Function PeekMessage(<System.Runtime.InteropServices.Out()> ByRef lpMsg As MSG, ByVal hWnd As IntPtr, ByVal wMsgFilterMin As UInteger, ByVal wMsgFilterMax As UInteger, ByVal wRemoveMsg As UInteger) As <MarshalAs(UnmanagedType.Bool)> Boolean
      End Function

      <DllImport("user32.dll")> _
      Shared Function TranslateMessage(ByRef lpMsg As MSG) As Boolean
      End Function
      <DllImport("user32.dll")> _
      Shared Function DispatchMessage(ByRef lpmsg As MSG) As IntPtr
      End Function

      Private Const PM_REMOVE As UInteger = 1

      Public Shared Function WaitForComplete(ByVal mill As Double, ByVal wh As WaitHandle) As WaitReturn
          Dim goal As TimeSpan = New TimeSpan(DateTime.Now.AddMilliseconds(mill).Ticks)

          Do
              Dim msg As MSG = New MSG()

              If PeekMessage(msg, IntPtr.Zero, 0, 0, PM_REMOVE) Then
                  TranslateMessage(msg)
                  DispatchMessage(msg)
              End If

              If wh.WaitOne(New TimeSpan(0, 0, 0), False) Then
                  Return WaitReturn.Complete
              End If

              If goal.CompareTo(New TimeSpan(DateTime.Now.Ticks)) < 0 Then
                  Return WaitReturn.Timeout
              End If

          Loop While True
      End Function
  End Class

  '
  ' Secure client (TLS)
  '
  Private Class Client : Inherits DicomNet
      Private waitEvent As AutoResetEvent = New AutoResetEvent(False)
   Private clientPEM As String = LeadtoolsExamples.Common.ImagesPath.Path + "client.pem"

   Public Sub New()
      MyBase.New(Nothing, DicomNetSecurityeMode.Tls)
      SetTlsCipherSuiteByIndex(0, DicomTlsCipherSuiteType.DheRsaWithDesCbcSha)
      SetTlsClientCertificate(clientPEM, DicomTlsCertificateType.Pem, Nothing)

      'Over here we can get detailed information about the Cipher Suite
      ' Can also call GetTlsCipherSuiteByIndex
      Dim cipherSuite As DicomTlsCipherSuiteType
      cipherSuite = GetTlsCipherSuite()
      'Returns DicomTlsEncryptionMethodType
      Console.WriteLine("Encryption Algorithm is : {0}", GetTlsEncryptionAlgorithm(cipherSuite))
      'Returns DicomTlsAuthenticationMethodType
      Console.WriteLine("Authentication Algorithm is : {0}", GetTlsAuthenticationAlgorithm(cipherSuite))
      'Returns DicomTlsMacMethodType
      Console.WriteLine("Integrity Algorithm is : {0}", GetTlsIntegrityAlgorithm(cipherSuite))
      'Returns DicomTlsExchangeMethodType
      Console.WriteLine("Key Exchange Algorithm is : {0}", GetTlsKeyExchangeAlgorithm(cipherSuite))
      Console.WriteLine("Encryption Key Length is : {0}", GetTlsEncryptionKeyLength(cipherSuite))
      Console.WriteLine("Mutual Authentication Key Length is : {0}", GetTlsMutualAuthenticationKeyLength(cipherSuite))

   End Sub

   Public Function Wait() As Boolean
      Dim ret As WaitReturn

      ret = Utils.WaitForComplete((5 * 60) * 1000, waitEvent)

      Return (ret = WaitReturn.Complete)
   End Function

   Protected Overrides Sub OnConnect(ByVal [error] As DicomExceptionCode)
      waitEvent.Set()
   End Sub

   Protected Overrides Function OnPrivateKeyPassword(ByVal encryption As Boolean) As String
      Return "test"
   End Function

   Protected Overrides Sub OnSecureLinkReady(ByVal [error] As DicomExceptionCode)
      waitEvent.Set()
   End Sub
End Class

'
' Secure server (TLS)
'
Private Class ServerConnection : Inherits DicomNet

   Private serverPEM As String = LeadtoolsExamples.Common.ImagesPath.Path + "server.pem"

   Public Sub New()
      MyBase.New(Nothing, DicomNetSecurityeMode.Tls)
      SetTlsCipherSuiteByIndex(0, DicomTlsCipherSuiteType.DheRsaWith3DesEdeCbcSha)
      SetTlsClientCertificate(serverPEM, DicomTlsCertificateType.Pem, Nothing)
   End Sub

   Protected Overrides Function OnPrivateKeyPassword(ByVal encryption As Boolean) As String
      Return "test"
   End Function
End Class

  Private Class Server : Inherits DicomNet
      Private client As ServerConnection

      Public Sub New()
          MyBase.New(Nothing, DicomNetSecurityeMode.None)
      End Sub

      Protected Overrides Sub OnAccept(ByVal [error] As DicomExceptionCode)
          client = New ServerConnection()

          Accept(client)
      End Sub

      Protected Overloads Overrides Sub Dispose(ByVal __p1 As Boolean)
          client.Dispose()
          MyBase.Dispose(__p1)
      End Sub
  End Class



  Public Sub TLSSecuritySample()
      DicomEngine.Startup()
      DicomNet.Startup()

      Using server As Server = New Server()
          Using client As Client = New Client()
              server.Listen("127.0.0.1", 104, 1) ' start server
              client.Connect(Nothing, 1000, "127.0.0.1", 104) ' connect to server
              If (Not client.Wait()) Then ' wait for connection to finish
                  Debug.Fail("Connection timed out")
              End If

              Debug.Assert(client.IsConnected(), "Client not connected")

              '
              ' Wait for authenication
              '
              If (Not client.Wait()) Then
                  Debug.Fail("Connection timed out waiting for authenication")
              End If

              ' Once two computers have negotiated the ciphersuite, and have 
              ' authenticated each other, they can begin transferring 
              ' messages and data between them.

              ' Continue with normal dicom communication

              client.CloseForced(True)
          End Using
          server.CloseForced(True)
      End Using

      DicomEngine.Shutdown()
      DicomNet.Shutdown()
  End Sub

[StructLayout(LayoutKind.Sequential)]
public struct MSG
{
    public IntPtr hwnd;
    public uint message;
    public IntPtr wParam;
    public IntPtr lParam;
    public uint time;
    public System.Drawing.Point p;
}
public enum WaitReturn
{
    Complete,
    Timeout,
}

class Utils
{
    [DllImport("user32.dll")]
    [return: MarshalAs(UnmanagedType.Bool)]
    static extern bool PeekMessage(out MSG lpMsg, IntPtr hWnd,
                                   uint wMsgFilterMin, uint wMsgFilterMax,
                                   uint wRemoveMsg);

    [DllImport("user32.dll")]
    static extern bool TranslateMessage([In] ref MSG lpMsg);
    [DllImport("user32.dll")]
    static extern IntPtr DispatchMessage([In] ref MSG lpmsg);

    const uint PM_REMOVE = 1;

    public static WaitReturn WaitForComplete(double mill, WaitHandle wh)
    {
        TimeSpan goal = new TimeSpan(DateTime.Now.AddMilliseconds(mill).Ticks);

        do
        {
            MSG msg = new MSG();

            if (PeekMessage(out msg, IntPtr.Zero, 0, 0, PM_REMOVE))
            {
                TranslateMessage(ref msg);
                DispatchMessage(ref msg);
            }

            if (wh.WaitOne(new TimeSpan(0, 0, 0), false))
            {
                return WaitReturn.Complete;
            }

            if (goal.CompareTo(new TimeSpan(DateTime.Now.Ticks)) < 0)
            {
                return WaitReturn.Timeout;
            }

        } while (true);
    }
}

//
// Secure client (TLS)
//
class Client : DicomNet
{
    AutoResetEvent waitEvent = new AutoResetEvent(false);
    string clientPEM = LeadtoolsExamples.Common.ImagesPath.Path + "client.pem";

    public Client()
        : base(null, DicomNetSecurityeMode.Tls)
    {
       SetTlsCipherSuiteByIndex(0, DicomTlsCipherSuiteType.DheRsaWithDesCbcSha);
       SetTlsClientCertificate(clientPEM,DicomTlsCertificateType.Pem, null);

       //Over here we can get detailed information about the Cipher Suite
       DicomTlsCipherSuiteType cipherSuite = GetTlsCipherSuite();// Can also call GetTlsCipherSuiteByIndex
       //Returns DicomTlsEncryptionMethodType
       Console.WriteLine("Encryption Algorithm is : {0}", GetTlsEncryptionAlgorithm(cipherSuite));
       //Returns DicomTlsAuthenticationMethodType
       Console.WriteLine("Authentication Algorithm is : {0}", GetTlsAuthenticationAlgorithm(cipherSuite));
       //Returns DicomTlsMacMethodType
       Console.WriteLine("Integrity Algorithm is : {0}", GetTlsIntegrityAlgorithm(cipherSuite));
       //Returns DicomTlsExchangeMethodType
       Console.WriteLine("Key Exchange Algorithm is : {0}", GetTlsKeyExchangeAlgorithm(cipherSuite));
       Console.WriteLine("Encryption Key Length is : {0}", GetTlsEncryptionKeyLength(cipherSuite));
       Console.WriteLine("Mutual Authentication Key Length is : {0}", GetTlsMutualAuthenticationKeyLength(cipherSuite));
    }

    public bool Wait()
    {
        WaitReturn ret;

        ret = Utils.WaitForComplete((5 * 60) * 1000, waitEvent);

        return (ret == WaitReturn.Complete);
    }

    protected override void OnConnect(DicomExceptionCode error)
    {
        waitEvent.Set();
    }

    protected override string OnPrivateKeyPassword(bool encryption)
    {
        return "test";
    }

    protected override void OnSecureLinkReady(DicomExceptionCode error)
    {
        waitEvent.Set();
    }
}

//
// Secure server (TLS)
//
class ServerConnection : DicomNet
{

    string serverPEM = LeadtoolsExamples.Common.ImagesPath.Path + "server.pem";

    public ServerConnection()
        : base(null, DicomNetSecurityeMode.Tls)
    {
       SetTlsCipherSuiteByIndex(0, DicomTlsCipherSuiteType.DheRsaWith3DesEdeCbcSha);
       SetTlsClientCertificate(serverPEM, DicomTlsCertificateType.Pem, null);
    }

    protected override string OnPrivateKeyPassword(bool encryption)
    {
        return "test";
    }
}

class Server : DicomNet
{
    ServerConnection client;

    public Server()
        : base(null, DicomNetSecurityeMode.None)
    {
    }

    protected override void OnAccept(DicomExceptionCode error)
    {
        client = new ServerConnection();

        Accept(client);
    }

    protected override void Dispose(bool __p1)
    {
        client.Dispose();
        base.Dispose(__p1);
    }
}


public void TLSSecuritySample()
{
    DicomEngine.Startup();
    DicomNet.Startup();

    using (Server server = new Server())
    {
        using (Client client = new Client())
        {
            server.Listen("127.0.0.1", 104, 1); // start server
            client.Connect(null, 1000, "127.0.0.1", 104); // connect to server
            if (!client.Wait()) // wait for connection to finish
            {
                Debug.Fail("Connection timed out");
            }

            Debug.Assert(client.IsConnected(), "Client not connected");

            //
            // Wait for authenication
            //
            if (!client.Wait())
            {
                Debug.Fail("Connection timed out waiting for authenication");
            }

            // Once two computers have negotiated the ciphersuite, and have 
            // authenticated each other, they can begin transferring 
            // messages and data between them.

            // Continue with normal dicom communication

            client.CloseForced(true);
        }
        server.CloseForced(true);
    }

    DicomEngine.Shutdown();
    DicomNet.Shutdown();
}