LEADTOOLS Medical (Leadtools.Dicom assembly)
LEAD Technologies, Inc

Initialize Method (DicomNet)

Example 







The location of the temporary files. This should be the same string that was used in the DicomNet constructor.
The security mode to use when initializing the network structure. This should be the same value that was used in the DicomNet constructor.
A DicomOpenSslContextCreationSettings object that is used to modify the security defaults. This is used only if the parameter mode is DicomNetSecurityeMode.Tls. Pass a null reference (Nothing in Visual Basic) to get the default values.
Changes security options from the defaults. .NET support
Syntax
'Declaration
 
Public Sub Initialize( _
   ByVal path As String, _
   ByVal mode As DicomNetSecurityeMode, _
   ByVal openSslContextCreationSettings As DicomOpenSslContextCreationSettings _
) 
'Usage
 
Dim instance As DicomNet
Dim path As String
Dim mode As DicomNetSecurityeMode
Dim openSslContextCreationSettings As DicomOpenSslContextCreationSettings
 
instance.Initialize(path, mode, openSslContextCreationSettings)
ObjectiveC Syntax
 function Leadtools.Dicom.DicomNet.Initialize( 
   path ,
   mode ,
   openSslContextCreationSettings 
)

Parameters

path
The location of the temporary files. This should be the same string that was used in the DicomNet constructor.
mode
The security mode to use when initializing the network structure. This should be the same value that was used in the DicomNet constructor.
openSslContextCreationSettings
A DicomOpenSslContextCreationSettings object that is used to modify the security defaults. This is used only if the parameter mode is DicomNetSecurityeMode.Tls. Pass a null reference (Nothing in Visual Basic) to get the default values.
Remarks
This method is to be used in conjunction with the DicomNet(string, DicomNetSecurityeMode, bool) constructor when changing security options from the defaults. Note that when using the DicomNet(string, DicomNetSecurityeMode, bool) version of the constructor, in addition to calling Startup, it is also necessary to call Initialize in order to prepare the DicomNet object for use. Use the openSslContextCreationSettings parameter when the security mode is set to DicomNetSecurityeMode.Tls.

Note that the following uses of the DicomNet constructors are functionally equivalent:

  1.             DicomNet net = new DicomNet(path, mode);
                
    
  2.             DicomNet net = new DicomNet(path, mode, false);
                net.Initialize(path, mode, null);
                
    
Example
Copy CodeCopy Code  
<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)

         '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) connection with a client
   '
   Private Class ServerConnection : Inherits DicomNet

      Public Sub New()
         MyBase.New(Nothing, DicomNetSecurityeMode.Tls, False)

      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
      Private certificationAuthoritiesFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "CA.pem")

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

      Protected Overrides Sub OnAccept(ByVal [error] As DicomExceptionCode)
         Dim serverPEM As String = Path.Combine(LEAD_VARS.ImagesDir, "server.pem")
         client = New ServerConnection()
         'Require and verify a client certificate.
         'Support SSL version 3 or TLS Version 1 for the handshake.
         'Use trusted certificate authority file to verify the client certificate
         'Verify the client certificate chain to a maximum depth of 2.
         Dim settings As New DicomOpenSslContextCreationSettings(DicomSslMethodType.TlsV1, _
            certificationAuthoritiesFileName, _
            DicomOpenSslVerificationFlags.Peer Or DicomOpenSslVerificationFlags.FailIfNoPeerCertificate, _
            2, _
            DicomOpenSslOptionsFlags.NoSslV2 Or DicomOpenSslOptionsFlags.AllBugWorkarounds)
         'You can use the properties too, to specify the context creation settings.
         settings.MethodType = DicomSslMethodType.SslV23
         settings.CertificationAuthoritiesFileName = certificationAuthoritiesFileName
         settings.VerificationFlags = DicomOpenSslVerificationFlags.Peer Or DicomOpenSslVerificationFlags.FailIfNoPeerCertificate
         settings.Options = DicomOpenSslOptionsFlags.NoSslV2 Or DicomOpenSslOptionsFlags.AllBugWorkarounds

         client.Initialize(Nothing, DicomNetSecurityeMode.Tls, settings)
         client.SetTlsCipherSuiteByIndex(0, DicomTlsCipherSuiteType.DheRsaWith3DesEdeCbcSha)
         client.SetTlsClientCertificate(serverPEM, DicomTlsCertificateType.Pem, Nothing)

         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

Public NotInheritable Class LEAD_VARS
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class
[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) connection with a client
     //

     class ServerConnection : DicomNet
     {
         public ServerConnection()
             : base(null, DicomNetSecurityeMode.Tls, false)
         {

         }

         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)
         {
            string serverPEM = Path.Combine(LEAD_VARS.ImagesDir, "server.pem");
            client = new ServerConnection();
            if (client != null)
            {
               string certificationAuthoritiesFileName = Path.Combine(LEAD_VARS.ImagesDir, "CA.pem");
               //Require and verify a client certificate.
               //Support SSL version 3 or TLS Version 1 for the handshake.
               //Use trusted certificate authority file to verify the client certificate
               //Verify the client certificate chain to a maximum depth of 2.
               DicomOpenSslContextCreationSettings settings = new DicomOpenSslContextCreationSettings(DicomSslMethodType.TlsV1, 
                  certificationAuthoritiesFileName,
                  DicomOpenSslVerificationFlags.Peer |
                  DicomOpenSslVerificationFlags.FailIfNoPeerCertificate,
                  2,
                  DicomOpenSslOptionsFlags.NoSslV2|
                  DicomOpenSslOptionsFlags.AllBugWorkarounds);
               //You can use the properties too, to specify the context creation settings.
               //settings.MethodType = DicomSslMethodType.SslV23;
               //settings.CertificationAuthoritiesFileName = certificationAuthoritiesFileName;
               //settings.VerificationFlags =  DicomOpenSslVerificationFlags.Peer |
               //                              DicomOpenSslVerificationFlags.FailIfNoPeerCertificate;
               //settings.Options = DicomOpenSslOptionsFlags.NoSslV2| DicomOpenSslOptionsFlags.AllBugWorkarounds;
               client.Initialize(null, DicomNetSecurityeMode.Tls, settings);
               client.SetTlsCipherSuiteByIndex(0, DicomTlsCipherSuiteType.DheRsaWith3DesEdeCbcSha);
               client.SetTlsClientCertificate(serverPEM, DicomTlsCertificateType.Pem, null);
            }
            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();
     }

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

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

See Also

Reference

DicomNet Class
DicomNet Members
Startup Method

 

 


Products | Support | Contact Us | Copyright Notices

© 2006-2012 All Rights Reserved. LEAD Technologies, Inc.

Leadtools.Dicom requires a Medical toolkit server license and unlock key. For more information, refer to: Imaging Pro/Document/Medical Features