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

GetTlsEncryptionAlgorithm Method

Example 







The cipher suite for which to get the encryption mode or algorithm.
Returns the encryption mode (DES, 3DES, etc.) for the specified cipher suite. .NET support
Syntax
public DicomTlsEncryptionMethodType GetTlsEncryptionAlgorithm( 
   DicomTlsCipherSuiteType cipher
)
'Declaration
 
Public Function GetTlsEncryptionAlgorithm( _
   ByVal cipher As DicomTlsCipherSuiteType _
) As DicomTlsEncryptionMethodType
'Usage
 
Dim instance As DicomNet
Dim cipher As DicomTlsCipherSuiteType
Dim value As DicomTlsEncryptionMethodType
 
value = instance.GetTlsEncryptionAlgorithm(cipher)
public DicomTlsEncryptionMethodType GetTlsEncryptionAlgorithm( 
   DicomTlsCipherSuiteType cipher
)
ObjectiveC Syntax
 function Leadtools.Dicom.DicomNet.GetTlsEncryptionAlgorithm( 
   cipher 
)
public:
DicomTlsEncryptionMethodType GetTlsEncryptionAlgorithm( 
   DicomTlsCipherSuiteType cipher
) 

Parameters

cipher
The cipher suite for which to get the encryption mode or algorithm.

Return Value

The encryption mode or algorithm for the specified cipher suite.
Remarks
There are several different cipher suites. Some of these differ only in the encryption mode or algorithm.
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)
   '
   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.

                 ' 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);

            //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 = 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.

                 // 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
GetTlsAuthenticationAlgorithm Method
GetTlsIntegrityAlgorithm Method
GetTlsKeyExchangeAlgorithm Method
GetTlsEncryptionKeyLength Method
GetTlsMutualAuthenticationKeyLength Method

 

 


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