LEADTOOLS Medical (Leadtools.Dicom assembly)

GetTlsCipherSuiteByIndex Method

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Example 







Index of the cipher suite to get. This is a zero-based index into an 8-position array that contains available cipher suites, listed by preference.
Returns the cipher suite present at the specified index.
Syntax
public DicomTlsCipherSuiteType GetTlsCipherSuiteByIndex( 
   int index
)
'Declaration
 
Public Function GetTlsCipherSuiteByIndex( _
   ByVal index As Integer _
) As DicomTlsCipherSuiteType
'Usage
 
Dim instance As DicomNet
Dim index As Integer
Dim value As DicomTlsCipherSuiteType
 
value = instance.GetTlsCipherSuiteByIndex(index)
public DicomTlsCipherSuiteType GetTlsCipherSuiteByIndex( 
   int index
)

            

            
 function Leadtools.Dicom.DicomNet.GetTlsCipherSuiteByIndex( 
   index 
)
public:
DicomTlsCipherSuiteType GetTlsCipherSuiteByIndex( 
   int index
) 

Parameters

index
Index of the cipher suite to get. This is a zero-based index into an 8-position array that contains available cipher suites, listed by preference.

Return Value

The cipher suite agreed upon during the TLS protocol. If no cipher suite has been agreed upon yet, the method will return DicomTlsCipherSuiteType.None.
Remarks
More cipher suites from the TLS standard can be added. Currently however, LEADTOOLS only supports those cipher suites specified by the DicomTlsCipherSuiteType enumeration.
Example
Copy Code  
Imports Leadtools
  Imports Leadtools.Dicom

  <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 = Path.Combine(LEAD_VARS.ImagesDir, "client.pem")

   Public Sub New()
      MyBase.New(Nothing, DicomNetSecurityeMode.Tls)
      SetTlsCipherSuiteByIndex(0, DicomTlsCipherSuiteType.DheRsaWithDesCbcSha)
      SetTlsClientCertificate(clientPEM, DicomTlsCertificateType.Pem, Nothing)
   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 = Path.Combine(LEAD_VARS.ImagesDir, "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.

               ' Now we can get detailed information about the Cipher Suite 
               Dim cipherSuite As DicomTlsCipherSuiteType
               cipherSuite = client.GetTlsCipherSuite()

               Console.WriteLine("Encryption Algorithm is : {0}",             client.GetTlsEncryptionAlgorithm(cipherSuite))
               Console.WriteLine("Authentication Algorithm is : {0}",         client.GetTlsAuthenticationAlgorithm(cipherSuite))
               Console.WriteLine("Integrity Algorithm is : {0}",              client.GetTlsIntegrityAlgorithm(cipherSuite))
               Console.WriteLine("Key Exchange Algorithm is : {0}",           client.GetTlsKeyExchangeAlgorithm(cipherSuite))
               Console.WriteLine("Encryption Key Length is : {0}",            client.GetTlsEncryptionKeyLength(cipherSuite))
               Console.WriteLine("Mutual Authentication Key Length is : {0}", client.GetTlsMutualAuthenticationKeyLength(cipherSuite))

              ' Continue with normal dicom communication

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

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

  Public NotInheritable Class LEAD_VARS
  Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
  End Class
using Leadtools;
using Leadtools.Dicom;

[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 = Path.Combine(LEAD_VARS.ImagesDir, "client.pem");

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

    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 = Path.Combine(LEAD_VARS.ImagesDir, "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.

            //Now we can get detailed information about the Cipher Suite 
            DicomTlsCipherSuiteType cipherSuite = client.GetTlsCipherSuite();// Can also call GetTlsCipherSuiteByIndex 

            Console.WriteLine("Encryption Algorithm is : {0}",             client.GetTlsEncryptionAlgorithm(cipherSuite));
            Console.WriteLine("Authentication Algorithm is : {0}",         client.GetTlsAuthenticationAlgorithm(cipherSuite));
            Console.WriteLine("Integrity Algorithm is : {0}",              client.GetTlsIntegrityAlgorithm(cipherSuite));
            Console.WriteLine("Key Exchange Algorithm is : {0}",           client.GetTlsKeyExchangeAlgorithm(cipherSuite));
            Console.WriteLine("Encryption Key Length is : {0}",            client.GetTlsEncryptionKeyLength(cipherSuite));
            Console.WriteLine("Mutual Authentication Key Length is : {0}", client.GetTlsMutualAuthenticationKeyLength(cipherSuite));

            // Continue with normal dicom communication

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

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

static class LEAD_VARS
{
public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}
Requirements

Target Platforms

See Also

Reference

DicomNet Class
DicomNet Members
SetTlsCipherSuiteByIndex Method
GetTlsCipherSuite Method

 

 


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