Announced v0.2.0 release

Added the ability to acquire a valid credential by providing a username/password combination.

.gitignore

@@ -0,0 +1 @@
+.vs

NSspi.sln

@@ -1,6 +1,8 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio 2012
+# Visual Studio 14
+VisualStudioVersion = 14.0.25420.1
+MinimumVisualStudioVersion = 10.0.40219.1
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "TestClient", "TestClient\TestClient.csproj", "{E93FBF1A-5198-44D6-BDF0-880D17F2B81A}"
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "TestProtocol", "TestProtocol\TestProtocol.csproj", "{9BFD94E1-D9FB-44D7-A6E7-8BAC2620E535}"

NSspi/.gitignore

@@ -0,0 +1,2 @@
+bin
+obj

NSspi/ByteWriter.cs

@@ -1,9 +1,4 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Runtime.InteropServices;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace NSspi
 {
@@ -13,7 +8,7 @@ namespace NSspi
     public static class ByteWriter
     {
         // Big endian: Most significant byte at lowest address in memory.
-        
+
         /// <summary>
         /// Writes a 2-byte signed integer to the buffer in big-endian format.
         /// </summary>
@@ -37,8 +32,7 @@ namespace NSspi
             buffer[position + 0] = (byte)( value >> 24 );
             buffer[position + 1] = (byte)( value >> 16 );
             buffer[position + 2] = (byte)( value >> 8 );
-            buffer[position + 3] = (byte)( value);
-
+            buffer[position + 3] = (byte)( value );
         }
 
         /// <summary>
@@ -77,4 +71,4 @@ namespace NSspi
             return value;
         }
     }
-}
+}

NSspi/Contexts/ClientContext.cs

@@ -1,9 +1,4 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Runtime.InteropServices;
-using System.Text;
-using System.Threading.Tasks;
 using NSspi.Buffers;
 using NSspi.Credentials;
 
@@ -14,7 +9,7 @@ namespace NSspi.Contexts
     /// with the server and to encrypt, decrypt, sign and verify messages to and from the server.
     /// </summary>
     /// <remarks>
-    /// A client and server establish a shared security context by exchanging authentication tokens. Once 
+    /// A client and server establish a shared security context by exchanging authentication tokens. Once
     /// the shared context is established, the client and server can pass messages to each other, encrypted,
     /// signed, etc, using the established parameters of the shared context.
     /// </remarks>
@@ -33,7 +28,7 @@ namespace NSspi.Contexts
         /// <param name="requestedAttribs">Requested attributes that describe the desired properties of the
         /// context once it is established. If a context cannot be established that satisfies the indicated
         /// properties, the context initialization is aborted.</param>
-        public ClientContext( ClientCredential cred, string serverPrinc, ContextAttrib requestedAttribs )
+        public ClientContext( Credential cred, string serverPrinc, ContextAttrib requestedAttribs )
             : base( cred )
         {
             this.serverPrinc = serverPrinc;
@@ -47,11 +42,11 @@ namespace NSspi.Contexts
         /// This method is performed iteratively to start, continue, and end the authentication cycle with the
         /// server. Each stage works by acquiring a token from one side, presenting it to the other side
         /// which in turn may generate a new token.
-        /// 
+        ///
         /// The cycle typically starts and ends with the client. On the first invocation on the client,
         /// no server token exists, and null is provided in its place. The client returns its status, providing
-        /// its output token for the server. The server accepts the clients token as input and provides a 
-        /// token as output to send back to the client. This cycle continues until the server and client 
+        /// its output token for the server. The server accepts the clients token as input and provides a
+        /// token as output to send back to the client. This cycle continues until the server and client
         /// both indicate, typically, a SecurityStatus of 'OK'.
         /// </remarks>
         /// <param name="serverToken">The most recently received token from the server, or null if beginning
@@ -60,7 +55,7 @@ namespace NSspi.Contexts
         /// <returns>A status message indicating the progression of the authentication cycle.
         /// A status of 'OK' indicates that the cycle is complete, from the client's perspective. If the outToken
         /// is not null, it must be sent to the server.
-        /// A status of 'Continue' indicates that the output token should be sent to the server and 
+        /// A status of 'Continue' indicates that the output token should be sent to the server and
         /// a response should be anticipated.</returns>
         public SecurityStatus Init( byte[] serverToken, out byte[] outToken )
         {
@@ -73,7 +68,7 @@ namespace NSspi.Contexts
 
             SecureBuffer serverBuffer;
             SecureBufferAdapter serverAdapter;
-            
+
             if( this.Disposed )
             {
                 throw new ObjectDisposedException( "ClientContext" );
@@ -86,24 +81,24 @@ namespace NSspi.Contexts
             {
                 throw new InvalidOperationException( "Must provide the server's response when continuing the init process." );
             }
-            
+
             // The security package tells us how big its biggest token will be. We'll allocate a buffer
             // that size, and it'll tell us how much it used.
-            outTokenBuffer = new SecureBuffer( 
-                new byte[ this.Credential.PackageInfo.MaxTokenLength ], 
-                BufferType.Token 
+            outTokenBuffer = new SecureBuffer(
+                new byte[this.Credential.PackageInfo.MaxTokenLength],
+                BufferType.Token
             );
 
             serverBuffer = null;
-            if ( serverToken != null )
+            if( serverToken != null )
             {
                 serverBuffer = new SecureBuffer( serverToken, BufferType.Token );
             }
 
             // Some notes on handles and invoking InitializeSecurityContext
-            //  - The first time around, the phContext parameter (the 'old' handle) is a null pointer to what 
-            //    would be an RawSspiHandle, to indicate this is the first time it's being called. 
-            //    The phNewContext is a pointer (reference) to an RawSspiHandle struct of where to write the 
+            //  - The first time around, the phContext parameter (the 'old' handle) is a null pointer to what
+            //    would be an RawSspiHandle, to indicate this is the first time it's being called.
+            //    The phNewContext is a pointer (reference) to an RawSspiHandle struct of where to write the
             //    new handle's values.
             //  - The next time you invoke ISC, it takes a pointer to the handle it gave you last time in phContext,
             //    and takes a pointer to where it should write the new handle's values in phNewContext.
@@ -111,13 +106,13 @@ namespace NSspi.Contexts
             //       "On the second call, phNewContext can be the same as the handle specified in the phContext
             //        parameter."
             //    It will overwrite the handle you gave it with the new handle value.
-            //  - All handle structures themselves are actually *two* pointer variables, eg, 64 bits on 32-bit 
+            //  - All handle structures themselves are actually *two* pointer variables, eg, 64 bits on 32-bit
             //    Windows, 128 bits on 64-bit Windows.
             //  - So in the end, on a 64-bit machine, we're passing a 64-bit value (the pointer to the struct) that
             //    points to 128 bits of memory (the struct itself) for where to write the handle numbers.
-            using ( outAdapter = new SecureBufferAdapter( outTokenBuffer ) )
+            using( outAdapter = new SecureBufferAdapter( outTokenBuffer ) )
             {
-                if ( this.ContextHandle.IsInvalid )
+                if( this.ContextHandle.IsInvalid )
                 {
                     status = ContextNativeMethods.InitializeSecurityContext_1(
                         ref this.Credential.Handle.rawHandle,
@@ -136,7 +131,7 @@ namespace NSspi.Contexts
                 }
                 else
                 {
-                    using ( serverAdapter = new SecureBufferAdapter( serverBuffer ) )
+                    using( serverAdapter = new SecureBufferAdapter( serverBuffer ) )
                     {
                         status = ContextNativeMethods.InitializeSecurityContext_2(
                             ref this.Credential.Handle.rawHandle,
@@ -179,4 +174,4 @@ namespace NSspi.Contexts
             return status;
         }
     }
-}
+}

NSspi/Contexts/Context.cs

@@ -1,23 +1,18 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
-using System.Text;
-using System.Threading.Tasks;
 using NSspi.Buffers;
-using NSspi.Contexts;
 using NSspi.Credentials;
 
 namespace NSspi.Contexts
 {
     /// <summary>
-    /// Represents a security context and provides common functionality required for all security 
+    /// Represents a security context and provides common functionality required for all security
     /// contexts.
     /// </summary>
     /// <remarks>
-    /// This class is abstract and has a protected constructor and Initialize method. The exact 
-    /// initialization implementation is provided by a subclasses, which may perform initialization 
+    /// This class is abstract and has a protected constructor and Initialize method. The exact
+    /// initialization implementation is provided by a subclasses, which may perform initialization
     /// in a variety of manners.
     /// </remarks>
     public abstract class Context : IDisposable
@@ -200,7 +195,7 @@ namespace NSspi.Contexts
 
             Array.Copy( paddingBuffer.Buffer, 0, result, position, paddingBuffer.Length );
             position += paddingBuffer.Length;
-                        
+
             return result;
         }
 
@@ -257,7 +252,7 @@ namespace NSspi.Contexts
             paddingLength = ByteWriter.ReadInt16_BE( input, position );
             position += 2;
 
-            if ( trailerLength + dataLength + paddingLength + 2 + 4 + 2 > input.Length )
+            if( trailerLength + dataLength + paddingLength + 2 + 4 + 2 > input.Length )
             {
                 throw new ArgumentException( "The buffer contains invalid data - the embedded length data does not add up." );
             }
@@ -278,7 +273,7 @@ namespace NSspi.Contexts
             {
                 throw new ArgumentException( "Input is missing data - it is not long enough to contain a fully encrypted message" );
             }
-            
+
             if( dataBuffer.Length <= remaining )
             {
                 Array.Copy( input, position, dataBuffer.Buffer, 0, dataBuffer.Length );
@@ -295,9 +290,8 @@ namespace NSspi.Contexts
                 Array.Copy( input, position, paddingBuffer.Buffer, 0, paddingBuffer.Length );
             }
             // else there was no padding.
-            
 
-            using( adapter = new SecureBufferAdapter( new [] { trailerBuffer, dataBuffer, paddingBuffer } ) )
+            using( adapter = new SecureBufferAdapter( new[] { trailerBuffer, dataBuffer, paddingBuffer } ) )
             {
                 status = ContextNativeMethods.SafeDecryptMessage(
                     this.ContextHandle,
@@ -348,7 +342,7 @@ namespace NSspi.Contexts
 
             Array.Copy( message, dataBuffer.Buffer, message.Length );
 
-            using ( adapter = new SecureBufferAdapter( new[] { dataBuffer, signatureBuffer } ) )
+            using( adapter = new SecureBufferAdapter( new[] { dataBuffer, signatureBuffer } ) )
             {
                 status = ContextNativeMethods.SafeMakeSignature(
                     this.ContextHandle,
@@ -358,7 +352,7 @@ namespace NSspi.Contexts
                 );
             }
 
-            if ( status != SecurityStatus.OK )
+            if( status != SecurityStatus.OK )
             {
                 throw new SSPIException( "Failed to create message signature.", status );
             }
@@ -366,7 +360,7 @@ namespace NSspi.Contexts
             byte[] outMessage;
             int position = 0;
 
-            // Enough room for 
+            // Enough room for
             //  - original message length (4 bytes)
             //  - signature length        (2 bytes)
             //  - original message
@@ -389,6 +383,35 @@ namespace NSspi.Contexts
             return outMessage;
         }
 
+        /// <summary>
+        /// Returns the Session Key from a context or null on failure.
+        /// </summary>
+        /// <remarks>
+        /// Session keys are sometimes needed for other purposes or HMAC functions. This function
+        /// will run QueryAttribute to get the session key struct, and read and return the key from
+        /// that struct.
+        /// </remarks>
+        /// <returns>byte[] with the session key data or null on failure</returns>
+        public byte[] QuerySessionKey()
+        {
+            SecurityStatus status;
+
+            byte[] SessionKey = null;
+
+            status = ContextNativeMethods.SafeQueryContextAttribute(
+                this.ContextHandle,
+                ContextQueryAttrib.SessionKey,
+                ref SessionKey
+            );
+
+            if( status != SecurityStatus.OK )
+            {
+                throw new SSPIException( "Failed to query session key.", status );
+            }
+
+            return SessionKey;
+        }
+
         /// <summary>
         /// Verifies the signature of a signed message
         /// </summary>
@@ -414,8 +437,8 @@ namespace NSspi.Contexts
             CheckLifecycle();
 
             sizes = QueryBufferSizes();
-            
-            if ( signedMessage.Length < 2 + 4 + sizes.MaxSignature )
+
+            if( signedMessage.Length < 2 + 4 + sizes.MaxSignature )
             {
                 throw new ArgumentException( "Input message is too small to possibly fit a valid message" );
             }
@@ -430,7 +453,7 @@ namespace NSspi.Contexts
             sigLen = ByteWriter.ReadInt16_BE( signedMessage, position );
             position += 2;
 
-            if ( messageLen + sigLen + 2 + 4 > signedMessage.Length )
+            if( messageLen + sigLen + 2 + 4 > signedMessage.Length )
             {
                 throw new ArgumentException( "The buffer contains invalid data - the embedded length data does not add up." );
             }
@@ -443,7 +466,7 @@ namespace NSspi.Contexts
             Array.Copy( signedMessage, position, signatureBuffer.Buffer, 0, sigLen );
             position += sigLen;
 
-            using ( adapter = new SecureBufferAdapter( new[] { dataBuffer, signatureBuffer } ) )
+            using( adapter = new SecureBufferAdapter( new[] { dataBuffer, signatureBuffer } ) )
             {
                 status = ContextNativeMethods.SafeVerifySignature(
                     this.ContextHandle,
@@ -453,12 +476,12 @@ namespace NSspi.Contexts
                 );
             }
 
-            if ( status == SecurityStatus.OK )
+            if( status == SecurityStatus.OK )
             {
                 origMessage = dataBuffer.Buffer;
                 return true;
             }
-            else if ( status == SecurityStatus.MessageAltered ||
+            else if( status == SecurityStatus.MessageAltered ||
                       status == SecurityStatus.OutOfSequence )
             {
                 origMessage = null;
@@ -485,9 +508,9 @@ namespace NSspi.Contexts
             {
                 this.ContextHandle.DangerousAddRef( ref gotRef );
             }
-            catch ( Exception )
+            catch( Exception )
             {
-                if ( gotRef )
+                if( gotRef )
                 {
                     this.ContextHandle.DangerousRelease();
                     gotRef = false;
@@ -497,7 +520,7 @@ namespace NSspi.Contexts
             }
             finally
             {
-                if ( gotRef )
+                if( gotRef )
                 {
                     status = ContextNativeMethods.QueryContextAttributes_Sizes(
                         ref this.ContextHandle.rawHandle,
@@ -521,7 +544,7 @@ namespace NSspi.Contexts
         /// </summary>
         /// <param name="attrib">The string-valued attribute to query.</param>
         /// <returns></returns>
-        private string QueryContextString(ContextQueryAttrib attrib)
+        private string QueryContextString( ContextQueryAttrib attrib )
         {
             SecPkgContext_String stringAttrib;
             SecurityStatus status = SecurityStatus.InternalError;
@@ -540,9 +563,9 @@ namespace NSspi.Contexts
             {
                 this.ContextHandle.DangerousAddRef( ref gotRef );
             }
-            catch ( Exception )
+            catch( Exception )
             {
-                if ( gotRef )
+                if( gotRef )
                 {
                     this.ContextHandle.DangerousRelease();
                     gotRef = false;
@@ -551,7 +574,7 @@ namespace NSspi.Contexts
             }
             finally
             {
-                if ( gotRef )
+                if( gotRef )
                 {
                     status = ContextNativeMethods.QueryContextAttributes_String(
                         ref this.ContextHandle.rawHandle,
@@ -561,14 +584,14 @@ namespace NSspi.Contexts
 
                     this.ContextHandle.DangerousRelease();
 
-                    if ( status == SecurityStatus.OK )
+                    if( status == SecurityStatus.OK )
                     {
                         result = Marshal.PtrToStringUni( stringAttrib.StringResult );
                         ContextNativeMethods.FreeContextBuffer( stringAttrib.StringResult );
                     }
                 }
             }
-            
+
             if( status == SecurityStatus.Unsupported )
             {
                 return null;
@@ -582,7 +605,7 @@ namespace NSspi.Contexts
         }
 
         /// <summary>
-        /// Verifies that the object's lifecycle (initialization / disposition) state is suitable for using the 
+        /// Verifies that the object's lifecycle (initialization / disposition) state is suitable for using the
         /// object.
         /// </summary>
         private void CheckLifecycle()
@@ -597,4 +620,4 @@ namespace NSspi.Contexts
             }
         }
     }
-}
+}

NSspi/Contexts/ContextAttrib.cs

@@ -1,29 +1,25 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace NSspi.Contexts
 {
     /// <summary>
-    /// Defines options for creating a security context via win32 InitializeSecurityContext 
+    /// Defines options for creating a security context via win32 InitializeSecurityContext
     /// (used by clients) and AcceptSecurityContext (used by servers).
     /// Required attribute flags are specified when creating the context. InitializeSecurityContext
-    /// and AcceptSecurityContext returns a value indicating what final attributes the created context 
+    /// and AcceptSecurityContext returns a value indicating what final attributes the created context
     /// actually has.
     /// </summary>
     [Flags]
-    public enum ContextAttrib : int 
+    public enum ContextAttrib : int
     {
         /// <summary>
         /// No additional attributes are provided.
         /// </summary>
         Zero = 0,
-        
+
         /// <summary>
         /// The server can use the context to authenticate to other servers as the client. The
-        /// MutualAuth flag must be set for this flag to work. Valid for Kerberos. Ignore this flag for 
+        /// MutualAuth flag must be set for this flag to work. Valid for Kerberos. Ignore this flag for
         /// constrained delegation.
         /// </summary>
         Delegate = 0x00000001,
@@ -36,17 +32,16 @@ namespace NSspi.Contexts
         /// </summary>
         MutualAuth = 0x00000002,
 
-
         /// <summary>
-        /// Detect replayed messages that have been encoded by using the EncryptMessage or MakeSignature 
+        /// Detect replayed messages that have been encoded by using the EncryptMessage or MakeSignature
         /// message support functionality.
         /// </summary>
         ReplayDetect = 0x00000004,
 
         /// <summary>
-        /// Detect messages received out of sequence when using the message support functionality. 
-        /// This flag implies all of the conditions specified by the Integrity flag - out-of-order sequence 
-        /// detection can only be trusted if the integrity of any underlying sequence detection mechanism 
+        /// Detect messages received out of sequence when using the message support functionality.
+        /// This flag implies all of the conditions specified by the Integrity flag - out-of-order sequence
+        /// detection can only be trusted if the integrity of any underlying sequence detection mechanism
         /// in transmitted data can be trusted.
         /// </summary>
         SequenceDetect = 0x00000008,
@@ -55,12 +50,12 @@ namespace NSspi.Contexts
         // Confidentiality is supported for NTLM with Microsoft
         // Windows NT version 4.0, SP4 and later and with the
         // Kerberos protocol in Microsoft Windows 2000 and later.
-        
+
         /// <summary>
         /// The context must protect data while in transit. Encrypt messages by using the EncryptMessage function.
         /// </summary>
         Confidentiality = 0x00000010,
-        
+
         /// <summary>
         /// A new session key must be negotiated.
         /// This value is supported only by the Kerberos security package.
@@ -68,13 +63,13 @@ namespace NSspi.Contexts
         UseSessionKey = 0x00000020,
 
         /// <summary>
-        /// The security package allocates output buffers for you. Buffers allocated by the security package have 
+        /// The security package allocates output buffers for you. Buffers allocated by the security package have
         /// to be released by the context memory management functions.
         /// </summary>
         AllocateMemory = 0x00000100,
 
         /// <summary>
-        /// The security context will not handle formatting messages. This value is the default for the Kerberos, 
+        /// The security context will not handle formatting messages. This value is the default for the Kerberos,
         /// Negotiate, and NTLM security packages.
         /// </summary>
         Connection = 0x00000800,
@@ -84,7 +79,7 @@ namespace NSspi.Contexts
         /// </summary>
         /// <remarks>
         /// A client specifies InitExtendedError in InitializeSecurityContext
-        /// and the server specifies AcceptExtendedError in AcceptSecurityContext. 
+        /// and the server specifies AcceptExtendedError in AcceptSecurityContext.
         /// </remarks>
         InitExtendedError = 0x00004000,
 
@@ -93,7 +88,7 @@ namespace NSspi.Contexts
         /// </summary>
         /// <remarks>
         /// A client specifies InitExtendedError in InitializeSecurityContext
-        /// and the server specifies AcceptExtendedError in AcceptSecurityContext. 
+        /// and the server specifies AcceptExtendedError in AcceptSecurityContext.
         /// </remarks>
         AcceptExtendedError = 0x00008000,
 
@@ -112,7 +107,7 @@ namespace NSspi.Contexts
         /// Replayed and out-of-sequence messages will not be detected with the setting of this attribute.
         /// Set ReplayDetect and SequenceDetect also if these behaviors are desired.
         /// </summary>
-        InitIntegrity = 0x00010000, 
+        InitIntegrity = 0x00010000,
 
         /// <summary>
         /// Sign messages and verify signatures by using the EncryptMessage and MakeSignature functions.
@@ -134,4 +129,4 @@ namespace NSspi.Contexts
         /// </summary>
         InitUseSuppliedCreds = 0x00000080,
     }
-}
+}

NSspi/Contexts/ContextNativeMethods.cs

@@ -1,13 +1,8 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
 using System.Runtime.CompilerServices;
 using System.Runtime.ConstrainedExecution;
 using System.Runtime.InteropServices;
-using System.Text;
-using System.Threading.Tasks;
 using NSspi.Buffers;
-using NSspi.Contexts;
 
 namespace NSspi.Contexts
 {
@@ -28,7 +23,7 @@ namespace NSspi.Contexts
           _Out_        PULONG pfContextAttr,
           _Out_opt_    PTimeStamp ptsTimeStamp
         );
-         
+
         SECURITY_STATUS SEC_Entry InitializeSecurityContext(
           _In_opt_     PCredHandle phCredential,                // [in] handle to the credentials
           _In_opt_     PCtxtHandle phContext,                   // [in/out] handle of partially formed context. Always NULL the first time through
@@ -45,7 +40,7 @@ namespace NSspi.Contexts
         );
         */
 
-        [DllImport( "Secur32.dll", EntryPoint = "AcceptSecurityContext",CharSet = CharSet.Unicode )]
+        [DllImport( "Secur32.dll", EntryPoint = "AcceptSecurityContext", CharSet = CharSet.Unicode )]
         internal static extern SecurityStatus AcceptSecurityContext_1(
             ref RawSspiHandle credHandle,
             IntPtr oldContextHandle,
@@ -58,7 +53,6 @@ namespace NSspi.Contexts
             ref TimeStamp expiry
         );
 
-
         [DllImport( "Secur32.dll", EntryPoint = "AcceptSecurityContext", CharSet = CharSet.Unicode )]
         internal static extern SecurityStatus AcceptSecurityContext_2(
             ref RawSspiHandle credHandle,
@@ -72,7 +66,6 @@ namespace NSspi.Contexts
             ref TimeStamp expiry
         );
 
-
         [DllImport( "Secur32.dll", EntryPoint = "InitializeSecurityContext", CharSet = CharSet.Unicode )]
         internal static extern SecurityStatus InitializeSecurityContext_1(
             ref RawSspiHandle credentialHandle,
@@ -89,7 +82,6 @@ namespace NSspi.Contexts
             ref TimeStamp expiry
         );
 
-
         [DllImport( "Secur32.dll", EntryPoint = "InitializeSecurityContext", CharSet = CharSet.Unicode )]
         internal static extern SecurityStatus InitializeSecurityContext_2(
             ref RawSspiHandle credentialHandle,
@@ -106,12 +98,11 @@ namespace NSspi.Contexts
             ref TimeStamp expiry
         );
 
-        [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success )]
+        [ReliabilityContract( Consistency.WillNotCorruptState, Cer.Success )]
         [DllImport( "Secur32.dll", EntryPoint = "DeleteSecurityContext", CharSet = CharSet.Unicode )]
         internal static extern SecurityStatus DeleteSecurityContext( ref RawSspiHandle contextHandle );
 
-
-        [ReliabilityContract(Consistency.WillNotCorruptState, Cer.MayFail )]
+        [ReliabilityContract( Consistency.WillNotCorruptState, Cer.MayFail )]
         [DllImport( "Secur32.dll", EntryPoint = "EncryptMessage", CharSet = CharSet.Unicode )]
         internal static extern SecurityStatus EncryptMessage(
             ref RawSspiHandle contextHandle,
@@ -155,7 +146,7 @@ namespace NSspi.Contexts
             ref SecPkgContext_Sizes sizes
         );
 
-        [ReliabilityContract( Consistency.WillNotCorruptState, Cer.Success)]
+        [ReliabilityContract( Consistency.WillNotCorruptState, Cer.Success )]
         [DllImport( "Secur32.dll", EntryPoint = "QueryContextAttributes", CharSet = CharSet.Unicode )]
         internal static extern SecurityStatus QueryContextAttributes_String(
             ref RawSspiHandle contextHandle,
@@ -163,11 +154,18 @@ namespace NSspi.Contexts
             ref SecPkgContext_String names
         );
 
+        [ReliabilityContract( Consistency.WillNotCorruptState, Cer.Success )]
+        [DllImport( "Secur32.dll", EntryPoint = "QueryContextAttributes", CharSet = CharSet.Unicode )]
+        internal static extern SecurityStatus QueryContextAttributes(
+           ref RawSspiHandle contextHandle,
+           ContextQueryAttrib attrib,
+           IntPtr attribute
+       );
+
         [ReliabilityContract( Consistency.WillNotCorruptState, Cer.Success )]
         [DllImport( "Secur32.dll", EntryPoint = "FreeContextBuffer", CharSet = CharSet.Unicode )]
         internal static extern SecurityStatus FreeContextBuffer( IntPtr handle );
 
-
         [ReliabilityContract( Consistency.WillNotCorruptState, Cer.Success )]
         [DllImport( "Secur32.dll", EntryPoint = "ImpersonateSecurityContext", CharSet = CharSet.Unicode )]
         internal static extern SecurityStatus ImpersonateSecurityContext( ref RawSspiHandle contextHandle );
@@ -176,8 +174,74 @@ namespace NSspi.Contexts
         [DllImport( "Secur32.dll", EntryPoint = "RevertSecurityContext", CharSet = CharSet.Unicode )]
         internal static extern SecurityStatus RevertSecurityContext( ref RawSspiHandle contextHandle );
 
+        [StructLayout( LayoutKind.Sequential )]
+        private class KeyStruct
+        {
+            public int size;
+            public IntPtr data;
+        }
+
+        internal static SecurityStatus SafeQueryContextAttribute(
+            SafeContextHandle handle,
+            ContextQueryAttrib attribute,
+            ref byte[] buffer
+            )
+        {
+            bool gotRef = false;
+
+            SecurityStatus status = SecurityStatus.InternalError;
+            RuntimeHelpers.PrepareConstrainedRegions();
+
+            int pointerSize = System.Environment.Is64BitOperatingSystem ? 8 : 4; //NOTE: update this when 128 bit processors exist
+            IntPtr alloc_buffer = Marshal.AllocHGlobal( sizeof( uint ) + pointerSize ); //NOTE: this is at most 4 + sizeof(void*) bytes
+                                                                                        //see struct SecPkgContext_SessionKey
+                                                                                        // https://msdn.microsoft.com/en-us/library/windows/desktop/aa380096(v=vs.85).aspx
+            try
+            {
+                handle.DangerousAddRef( ref gotRef );
+            }
+            catch( Exception )
+            {
+                if( gotRef )
+                {
+                    handle.DangerousRelease();
+                    gotRef = false;
+                    buffer = null;
+                }
+
+                throw;
+            }
+            finally
+            {
+                if( gotRef )
+                {
+                    status = ContextNativeMethods.QueryContextAttributes(
+                        ref handle.rawHandle,
+                        attribute,
+                        alloc_buffer
+                    );
+                    if( status == SecurityStatus.OK )
+                    {
+                        KeyStruct key = new KeyStruct();
+
+                        Marshal.PtrToStructure( alloc_buffer, key ); // fit to the proper size, read a byte[]
+
+                        byte[] sizedBuffer = new byte[key.size];
+
+                        for( int i = 0; i < key.size; i++ )
+                            sizedBuffer[i] = Marshal.ReadByte( key.data, i );
+
+                        buffer = sizedBuffer;
+                    }
+                    handle.DangerousRelease();
+                }
+            }
+            Marshal.FreeHGlobal( alloc_buffer );
+            return status;
+        }
+
         /// <summary>
-        /// Safely invokes the native EncryptMessage function, making sure that handle ref counting is 
+        /// Safely invokes the native EncryptMessage function, making sure that handle ref counting is
         /// performed in a proper CER.
         /// </summary>
         /// <param name="handle"></param>
@@ -199,9 +263,9 @@ namespace NSspi.Contexts
             {
                 handle.DangerousAddRef( ref gotRef );
             }
-            catch ( Exception )
+            catch( Exception )
             {
-                if ( gotRef )
+                if( gotRef )
                 {
                     handle.DangerousRelease();
                     gotRef = false;
@@ -211,7 +275,7 @@ namespace NSspi.Contexts
             }
             finally
             {
-                if ( gotRef )
+                if( gotRef )
                 {
                     status = ContextNativeMethods.EncryptMessage(
                         ref handle.rawHandle,
@@ -228,7 +292,7 @@ namespace NSspi.Contexts
         }
 
         /// <summary>
-        /// Safely invokes the native DecryptMessage function, making sure that handle ref counting is 
+        /// Safely invokes the native DecryptMessage function, making sure that handle ref counting is
         /// performed in a proper CER.
         /// </summary>
         /// <param name="handle"></param>
@@ -236,10 +300,10 @@ namespace NSspi.Contexts
         /// <param name="bufferAdapter"></param>
         /// <param name="sequenceNumber"></param>
         /// <returns></returns>
-        internal static SecurityStatus SafeDecryptMessage( 
-            SafeContextHandle handle, 
-            int qualityOfProtection, 
-            SecureBufferAdapter bufferAdapter, 
+        internal static SecurityStatus SafeDecryptMessage(
+            SafeContextHandle handle,
+            int qualityOfProtection,
+            SecureBufferAdapter bufferAdapter,
             int sequenceNumber )
         {
             SecurityStatus status = SecurityStatus.InvalidHandle;
@@ -279,7 +343,7 @@ namespace NSspi.Contexts
         }
 
         /// <summary>
-        /// Safely invokes the native MakeSignature function, making sure that handle ref counting is 
+        /// Safely invokes the native MakeSignature function, making sure that handle ref counting is
         /// performed in a proper CER.
         /// </summary>
         /// <param name="handle"></param>
@@ -301,9 +365,9 @@ namespace NSspi.Contexts
             {
                 handle.DangerousAddRef( ref gotRef );
             }
-            catch ( Exception )
+            catch( Exception )
             {
-                if ( gotRef )
+                if( gotRef )
                 {
                     handle.DangerousRelease();
                     gotRef = false;
@@ -313,7 +377,7 @@ namespace NSspi.Contexts
             }
             finally
             {
-                if ( gotRef )
+                if( gotRef )
                 {
                     status = ContextNativeMethods.MakeSignature(
                         ref handle.rawHandle,
@@ -330,7 +394,7 @@ namespace NSspi.Contexts
         }
 
         /// <summary>
-        /// Safely invokes the native VerifySignature function, making sure that handle ref counting is 
+        /// Safely invokes the native VerifySignature function, making sure that handle ref counting is
         /// performed in a proper CER.
         /// </summary>
         /// <param name="handle"></param>
@@ -352,9 +416,9 @@ namespace NSspi.Contexts
             {
                 handle.DangerousAddRef( ref gotRef );
             }
-            catch ( Exception )
+            catch( Exception )
             {
-                if ( gotRef )
+                if( gotRef )
                 {
                     handle.DangerousRelease();
                     gotRef = false;
@@ -364,7 +428,7 @@ namespace NSspi.Contexts
             }
             finally
             {
-                if ( gotRef )
+                if( gotRef )
                 {
                     status = ContextNativeMethods.VerifySignature(
                         ref handle.rawHandle,
@@ -380,4 +444,4 @@ namespace NSspi.Contexts
             return status;
         }
     }
-}
+}

NSspi/Contexts/ContextQueries.cs

@@ -1,9 +1,5 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
 using System.Runtime.InteropServices;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace NSspi.Contexts
 {
@@ -27,4 +23,4 @@ namespace NSspi.Contexts
     {
         public IntPtr StringResult;
     }
-}
+}

NSspi/Contexts/ContextQueryAttrib.cs

@@ -1,8 +1,4 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace NSspi.Contexts
 {
@@ -36,5 +32,15 @@ namespace NSspi.Contexts
         /// Results for a query of this type are stored in a Win32 SecPkgContext_Authority structure.
         /// </remarks>
         Authority = 6,
+
+        /// <summary>
+        /// Queries the context for it's neogtiated SessionKey
+        /// </summary>
+        /// <remarks>
+        /// Results for a query of this type are stored in a Win32 SecPkgContext_SessionKey structure
+        /// </remarks>
+        SessionKey = 9,
+
+        AccessToken = 13, //not implemented yet but this would be cool
     }
-}
+}

NSspi/Contexts/ImpersonationHandle.cs

@@ -1,21 +1,17 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace NSspi.Contexts
 {
     /// <summary>
-    /// Represents impersonation performed on a server on behalf of a client. 
+    /// Represents impersonation performed on a server on behalf of a client.
     /// </summary>
     /// <remarks>
     /// The handle controls the lifetime of impersonation, and will revert the impersonation
     /// if it is disposed, or if it is finalized ie by being leaked and garbage collected.
-    /// 
+    ///
     /// If the handle is accidentally leaked while operations are performed on behalf of the user,
     /// impersonation may be reverted at any arbitrary time, perhaps during those operations.
-    /// This may lead to operations being performed in the security context of the server, 
+    /// This may lead to operations being performed in the security context of the server,
     /// potentially leading to security vulnerabilities.
     /// </remarks>
     public class ImpersonationHandle : IDisposable
@@ -27,7 +23,7 @@ namespace NSspi.Contexts
         /// Initializes a new instance of the ImpersonationHandle. Does not perform impersonation.
         /// </summary>
         /// <param name="server">The server context that is performing impersonation.</param>
-        internal ImpersonationHandle(ServerContext server)
+        internal ImpersonationHandle( ServerContext server )
         {
             this.server = server;
             this.disposed = false;
@@ -54,6 +50,5 @@ namespace NSspi.Contexts
                 this.server.RevertImpersonate();
             }
         }
-
     }
-}
+}

NSspi/Contexts/SafeContextHandle.cs

@@ -1,9 +1,5 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
 using System.Runtime.ConstrainedExecution;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace NSspi.Contexts
 {
@@ -28,4 +24,4 @@ namespace NSspi.Contexts
             return status == SecurityStatus.OK;
         }
     }
-}
+}

NSspi/Contexts/ServerContext.cs

@@ -1,9 +1,5 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
 using System.Runtime.CompilerServices;
-using System.Text;
-using System.Threading.Tasks;
 using NSspi.Buffers;
 using NSspi.Credentials;
 
@@ -25,7 +21,7 @@ namespace NSspi.Contexts
         /// </summary>
         /// <param name="cred"></param>
         /// <param name="requestedAttribs"></param>
-        public ServerContext(ServerCredential cred, ContextAttrib requestedAttribs) : base ( cred )
+        public ServerContext( Credential cred, ContextAttrib requestedAttribs ) : base( cred )
         {
             this.requestedAttribs = requestedAttribs;
             this.finalAttribs = ContextAttrib.Zero;
@@ -50,11 +46,11 @@ namespace NSspi.Contexts
         /// This method is performed iteratively to continue and end the authentication cycle with the
         /// client. Each stage works by acquiring a token from one side, presenting it to the other side
         /// which in turn may generate a new token.
-        /// 
+        ///
         /// The cycle typically starts and ends with the client. On the first invocation on the client,
         /// no server token exists, and null is provided in its place. The client returns its status, providing
-        /// its output token for the server. The server accepts the clients token as input and provides a 
-        /// token as output to send back to the client. This cycle continues until the server and client 
+        /// its output token for the server. The server accepts the clients token as input and provides a
+        /// token as output to send back to the client. This cycle continues until the server and client
         /// both indicate, typically, a SecurityStatus of 'OK'.
         /// </remarks>
         /// <param name="clientToken">The most recently received token from the client.</param>
@@ -63,7 +59,7 @@ namespace NSspi.Contexts
         /// <returns>A status message indicating the progression of the authentication cycle.
         /// A status of 'OK' indicates that the cycle is complete, from the servers's perspective. If the nextToken
         /// is not null, it must be sent to the client.
-        /// A status of 'Continue' indicates that the output token should be sent to the client and 
+        /// A status of 'Continue' indicates that the output token should be sent to the client and
         /// a response should be anticipated.</returns>
         public SecurityStatus AcceptToken( byte[] clientToken, out byte[] nextToken )
         {
@@ -82,21 +78,21 @@ namespace NSspi.Contexts
             }
             else if( this.Initialized )
             {
-                throw new InvalidOperationException( 
+                throw new InvalidOperationException(
                     "Attempted to continue initialization of a ServerContext after initialization had completed."
                 );
             }
 
             clientBuffer = new SecureBuffer( clientToken, BufferType.Token );
 
-            outBuffer = new SecureBuffer( 
-                new byte[ this.Credential.PackageInfo.MaxTokenLength ], 
-                BufferType.Token 
+            outBuffer = new SecureBuffer(
+                new byte[this.Credential.PackageInfo.MaxTokenLength],
+                BufferType.Token
             );
 
-            using ( clientAdapter = new SecureBufferAdapter( clientBuffer ) )
+            using( clientAdapter = new SecureBufferAdapter( clientBuffer ) )
             {
-                using ( outAdapter = new SecureBufferAdapter( outBuffer ) )
+                using( outAdapter = new SecureBufferAdapter( outBuffer ) )
                 {
                     if( this.ContextHandle.IsInvalid )
                     {
@@ -125,19 +121,17 @@ namespace NSspi.Contexts
                             ref this.finalAttribs,
                             ref rawExpiry
                         );
-
-
                     }
                 }
             }
 
-            if ( status == SecurityStatus.OK )
+            if( status == SecurityStatus.OK )
             {
                 nextToken = null;
 
                 base.Initialize( rawExpiry.ToDateTime() );
 
-                if ( outBuffer.Length != 0 )
+                if( outBuffer.Length != 0 )
                 {
                     nextToken = new byte[outBuffer.Length];
                     Array.Copy( outBuffer.Buffer, nextToken, nextToken.Length );
@@ -147,7 +141,7 @@ namespace NSspi.Contexts
                     nextToken = null;
                 }
             }
-            else if ( status == SecurityStatus.ContinueNeeded )
+            else if( status == SecurityStatus.ContinueNeeded )
             {
                 nextToken = new byte[outBuffer.Length];
                 Array.Copy( outBuffer.Buffer, nextToken, nextToken.Length );
@@ -161,17 +155,17 @@ namespace NSspi.Contexts
         }
 
         /// <summary>
-        /// Changes the current thread's security context to impersonate the user of the client. 
+        /// Changes the current thread's security context to impersonate the user of the client.
         /// </summary>
         /// <remarks>
-        /// Requires that the security package provided with the server's credentials, as well as the 
+        /// Requires that the security package provided with the server's credentials, as well as the
         /// client's credentials, support impersonation.
-        /// 
-        /// Currently, only one thread may initiate impersonation per security context. Impersonation may 
+        ///
+        /// Currently, only one thread may initiate impersonation per security context. Impersonation may
         /// follow threads created by the initial impersonation thread, however.
         /// </remarks>
         /// <returns>A handle to capture the lifetime of the impersonation. Dispose the handle to revert
-        /// impersonation. If the handle is leaked, the impersonation will automatically revert at a 
+        /// impersonation. If the handle is leaked, the impersonation will automatically revert at a
         /// non-deterministic time when the handle is finalized by the Garbage Collector.</returns>
         public ImpersonationHandle ImpersonateClient()
         {
@@ -183,14 +177,20 @@ namespace NSspi.Contexts
             {
                 throw new ObjectDisposedException( "ServerContext" );
             }
+            else if( this.Initialized == false )
+            {
+                throw new InvalidOperationException(
+                    "The server context has not been completely initialized."
+                );
+            }
             else if( impersonating )
             {
                 throw new InvalidOperationException( "Cannot impersonate again while already impersonating." );
             }
             else if( this.SupportsImpersonate == false )
             {
-                throw new InvalidOperationException( 
-                    "The ServerContext is using a security package that does not support impersonation." 
+                throw new InvalidOperationException(
+                    "The ServerContext is using a security package that does not support impersonation."
                 );
             }
 
@@ -236,7 +236,7 @@ namespace NSspi.Contexts
             {
                 throw new SSPIException( "Failed to impersonate the client", status );
             }
-            
+
             return handle;
         }
 
@@ -300,4 +300,4 @@ namespace NSspi.Contexts
             base.Dispose( disposing );
         }
     }
-}
+}

NSspi/Credentials/AuthData.cs

@@ -0,0 +1,55 @@
+using System;
+using System.Runtime.InteropServices;
+
+namespace NSspi.Credentials
+{
+    /// <summary>
+    /// Provides authentication data in native method calls.
+    /// </summary>
+    /// <remarks>
+    /// Implements the 'SEC_WINNT_AUTH_IDENTITY' structure. See:
+    ///
+    /// https://msdn.microsoft.com/en-us/library/windows/desktop/aa380131(v=vs.85).aspx
+    /// </remarks>
+    [StructLayout( LayoutKind.Sequential )]
+    internal struct NativeAuthData
+    {
+        public NativeAuthData( string domain, string username, string password, NativeAuthDataFlag flag )
+        {
+            this.Domain = domain;
+            this.DomainLength = domain.Length;
+
+            this.User = username;
+            this.UserLength = username.Length;
+
+            this.Password = password;
+            this.PasswordLength = password.Length;
+
+            this.Flags = flag;
+        }
+
+        [MarshalAs( UnmanagedType.LPWStr )]
+        public string User;
+
+        public int UserLength;
+
+        [MarshalAs( UnmanagedType.LPWStr )]
+        public string Domain;
+
+        public int DomainLength;
+
+        [MarshalAs( UnmanagedType.LPWStr )]
+        public string Password;
+
+        public int PasswordLength;
+
+        public NativeAuthDataFlag Flags;
+    }
+
+    internal enum NativeAuthDataFlag : int
+    {
+        Ansi = 1,
+
+        Unicode = 1
+    }
+}

NSspi/Credentials/ClientCredential.cs

@@ -1,24 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Runtime.CompilerServices;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace NSspi.Credentials
-{
-    /// <summary>
-    /// Represents the credentials of the user running the current process, for use as an SSPI client.
-    /// </summary>
-    public class ClientCredential : CurrentCredential
-    {
-        /// <summary>
-        /// Initializes a new instance of the ClientCredential class.
-        /// </summary>
-        /// <param name="package">The security package to acquire the credential handle from.</param>
-        public ClientCredential( string package )
-            : base( package, CredentialUse.Outbound )
-        {
-        }
-    }
-}

NSspi/Credentials/ClientCurrentCredential.cs

@@ -0,0 +1,20 @@
+using System;
+
+namespace NSspi.Credentials
+{
+    /// <summary>
+    /// Represents a handle to the credentials of the user running the current process, to be used to
+    /// authenticate as a client.
+    /// </summary>
+    public class ClientCurrentCredential : CurrentCredential
+    {
+        /// <summary>
+        /// Initializes a new instance of the ClientCurrentCredential class.
+        /// </summary>
+        /// <param name="package">The security package to acquire the credential handle from.</param>
+        public ClientCurrentCredential( string package )
+            : base( package, CredentialUse.Outbound )
+        {
+        }
+    }
+}

NSspi/Credentials/Credential.cs

@@ -1,13 +1,6 @@
 using System;
-using System.Collections.Generic;
-using System.DirectoryServices.AccountManagement;
-using System.Linq;
 using System.Runtime.CompilerServices;
-using System.Runtime.ConstrainedExecution;
 using System.Runtime.InteropServices;
-using System.Text;
-using System.Threading.Tasks;
-using NSspi.Credentials;
 
 namespace NSspi.Credentials
 {
@@ -49,7 +42,7 @@ namespace NSspi.Credentials
 
             this.PackageInfo = PackageSupport.GetPackageCapabilities( this.SecurityPackage );
         }
-        
+
         /// <summary>
         /// Gets metadata for the security package associated with the credential.
         /// </summary>
@@ -151,7 +144,7 @@ namespace NSspi.Credentials
             protected set
             {
                 CheckLifecycle();
-                                
+
                 this.expiry = value;
             }
         }
@@ -187,9 +180,9 @@ namespace NSspi.Credentials
 
         protected virtual void Dispose( bool disposing )
         {
-            if ( this.disposed == false )
+            if( this.disposed == false )
             {
-                if ( disposing )
+                if( disposing )
                 {
                     this.safeCredHandle.Dispose();
                 }
@@ -206,4 +199,4 @@ namespace NSspi.Credentials
             }
         }
     }
-}
+}

NSspi/Credentials/CredentialNativeMethods.cs

@@ -1,17 +1,12 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
 using System.Runtime.ConstrainedExecution;
 using System.Runtime.InteropServices;
-using System.Text;
-using System.Threading.Tasks;
-using NSspi.Credentials;
 
 namespace NSspi.Credentials
 {
     internal static class CredentialNativeMethods
     {
-        [ReliabilityContract( Consistency.WillNotCorruptState, Cer.MayFail)]
+        [ReliabilityContract( Consistency.WillNotCorruptState, Cer.MayFail )]
         [DllImport( "Secur32.dll", EntryPoint = "AcquireCredentialsHandle", CharSet = CharSet.Unicode )]
         internal static extern SecurityStatus AcquireCredentialsHandle(
             string principleName,
@@ -25,13 +20,27 @@ namespace NSspi.Credentials
             ref TimeStamp expiry
         );
 
+        [ReliabilityContract( Consistency.WillNotCorruptState, Cer.MayFail )]
+        [DllImport( "Secur32.dll", EntryPoint = "AcquireCredentialsHandle", CharSet = CharSet.Unicode )]
+        internal static extern SecurityStatus AcquireCredentialsHandle_AuthData(
+            string principleName,
+            string packageName,
+            CredentialUse credentialUse,
+            IntPtr loginId,
+            ref NativeAuthData authData,
+            IntPtr getKeyFunc,
+            IntPtr getKeyData,
+            ref RawSspiHandle credentialHandle,
+            ref TimeStamp expiry
+        );
+
+
         [ReliabilityContract( Consistency.WillNotCorruptState, Cer.Success )]
         [DllImport( "Secur32.dll", EntryPoint = "FreeCredentialsHandle", CharSet = CharSet.Unicode )]
         internal static extern SecurityStatus FreeCredentialsHandle(
             ref RawSspiHandle credentialHandle
         );
 
-
         /// <summary>
         /// The overload of the QueryCredentialsAttribute method that is used for querying the name attribute.
         /// In this call, it takes a void* to a structure that contains a wide char pointer. The wide character
@@ -49,4 +58,4 @@ namespace NSspi.Credentials
             ref QueryNameAttribCarrier name
         );
     }
-}
+}

NSspi/Credentials/CredentialQueryAttrib.cs

@@ -1,8 +1,4 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace NSspi.Credentials
 {
@@ -16,4 +12,4 @@ namespace NSspi.Credentials
         /// </summary>
         Names = 1,
     }
-}
+}

NSspi/Credentials/CredentialUse.cs

@@ -1,8 +1,4 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace NSspi.Credentials
 {
@@ -29,4 +25,4 @@ namespace NSspi.Credentials
         /// </summary>
         Both = 3,
     }
-}
+}

NSspi/Credentials/CurrentCredential.cs

@@ -1,9 +1,5 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
 using System.Runtime.CompilerServices;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace NSspi.Credentials
 {
@@ -38,7 +34,7 @@ namespace NSspi.Credentials
             this.Handle = new SafeCredentialHandle();
 
             // The finally clause is the actual constrained region. The VM pre-allocates any stack space,
-            // performs any allocations it needs to prepare methods for execution, and postpones any 
+            // performs any allocations it needs to prepare methods for execution, and postpones any
             // instances of the 'uncatchable' exceptions (ThreadAbort, StackOverflow, OutOfMemory).
             RuntimeHelpers.PrepareConstrainedRegions();
             try { }
@@ -57,13 +53,12 @@ namespace NSspi.Credentials
                );
             }
 
-            if ( status != SecurityStatus.OK )
+            if( status != SecurityStatus.OK )
             {
                 throw new SSPIException( "Failed to call AcquireCredentialHandle", status );
             }
 
             this.Expiry = rawExpiry.ToDateTime();
         }
-
     }
-}
+}

NSspi/Credentials/PasswordCredential.cs

@@ -0,0 +1,78 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.CompilerServices;
+using System.Text;
+
+namespace NSspi.Credentials
+{
+    /// <summary>
+    /// Represents credentials acquired by providing a username, password, and domain.
+    /// </summary>
+    public class PasswordCredential : Credential
+    {
+        /// <summary>
+        /// Initializes a new instance of the PasswordCredential class.
+        /// </summary>
+        /// <remarks>
+        /// It is possible to acquire a valid handle to credentials that do not provide a valid
+        /// username-password combination. The username and password are not validation until the
+        /// authentication cycle begins.
+        /// </remarks>
+        /// <param name="domain">The domain to authenticate to.</param>
+        /// <param name="username">The username of the user to authenticate as.</param>
+        /// <param name="password">The user's password.</param>
+        /// <param name="secPackage">The SSPI security package to create credentials for.</param>
+        /// <param name="use">
+        /// Specify inbound when acquiring credentials for a server; outbound for a client.
+        /// </param>
+        public PasswordCredential( string domain, string username, string password, string secPackage, CredentialUse use ) 
+            : base( secPackage )
+        {
+            NativeAuthData authData = new NativeAuthData( domain, username, password, NativeAuthDataFlag.Unicode );
+
+            Init( authData, secPackage, use );
+        }
+
+        private void Init( NativeAuthData authData, string secPackage, CredentialUse use )
+        {
+            string packageName;
+            TimeStamp rawExpiry = new TimeStamp();
+            SecurityStatus status = SecurityStatus.InternalError;
+
+            // -- Package --
+            // Copy off for the call, since this.SecurityPackage is a property.
+            packageName = this.SecurityPackage;
+
+            this.Handle = new SafeCredentialHandle();
+
+
+            // The finally clause is the actual constrained region. The VM pre-allocates any stack space,
+            // performs any allocations it needs to prepare methods for execution, and postpones any
+            // instances of the 'uncatchable' exceptions (ThreadAbort, StackOverflow, OutOfMemory).
+            RuntimeHelpers.PrepareConstrainedRegions();
+            try { }
+            finally
+            {
+                status = CredentialNativeMethods.AcquireCredentialsHandle_AuthData(
+                   null,
+                   packageName,
+                   use,
+                   IntPtr.Zero,
+                   ref authData,
+                   IntPtr.Zero,
+                   IntPtr.Zero,
+                   ref this.Handle.rawHandle,
+                   ref rawExpiry
+               );
+            }
+
+            if( status != SecurityStatus.OK )
+            {
+                throw new SSPIException( "Failed to call AcquireCredentialHandle", status );
+            }
+
+            this.Expiry = rawExpiry.ToDateTime();
+        }
+    }
+}

NSspi/Credentials/QueryNameSupport.cs

@@ -1,9 +1,5 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
 using System.Runtime.InteropServices;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace NSspi.Credentials
 {
@@ -14,9 +10,9 @@ namespace NSspi.Credentials
     internal struct QueryNameAttribCarrier
     {
         /// <summary>
-        /// A pointer to a null-terminated ascii-encoded containing the principle name 
+        /// A pointer to a null-terminated ascii-encoded containing the principle name
         /// associated with a credential
         /// </summary>
         public IntPtr Name;
     }
-}
+}

NSspi/Credentials/SafeCredentialHandle.cs

@@ -1,9 +1,5 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
 using System.Runtime.ConstrainedExecution;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace NSspi.Credentials
 {
@@ -28,5 +24,4 @@ namespace NSspi.Credentials
             return status == SecurityStatus.OK;
         }
     }
-
-}
+}

NSspi/Credentials/ServerCurrentCredential.cs

@@ -1,25 +1,21 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Runtime.CompilerServices;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace NSspi.Credentials
 {
     /// <summary>
-    /// Represents the credentials of the user running the current process, for use as an SSPI server.
+    /// Represents a handle to the credentials of the user running the current process, to be used to
+    /// authenticate as a server.
     /// </summary>
-    public class ServerCredential : CurrentCredential
+    public class ServerCurrentCredential : CurrentCredential
     {
         /// <summary>
-        /// Initializes a new instance of the ServerCredential class, acquiring credentials from 
+        /// Initializes a new instance of the ServerCredential class, acquiring credentials from
         /// the current thread's security context.
         /// </summary>
         /// <param name="package">The name of the security package to obtain credentials from.</param>
-        public ServerCredential( string package )
+        public ServerCurrentCredential( string package )
             : base( package, CredentialUse.Inbound )
         {
         }
     }
-}
+}

NSspi/EnumMgr.cs

@@ -0,0 +1,57 @@
+using System;
+using System.Reflection;
+
+namespace NSspi
+{
+    [AttributeUsage( AttributeTargets.Field )]
+    public class EnumStringAttribute : Attribute
+    {
+        public EnumStringAttribute( string text )
+        {
+            this.Text = text;
+        }
+
+        public string Text { get; private set; }
+    }
+
+    public class EnumMgr
+    {
+        public static string ToText( Enum value )
+        {
+            FieldInfo field = value.GetType().GetField( value.ToString() );
+
+            EnumStringAttribute[] attribs = (EnumStringAttribute[])field.GetCustomAttributes( typeof( EnumStringAttribute ), false );
+
+            if( attribs == null || attribs.Length == 0 )
+            {
+                return null;
+            }
+            else
+            {
+                return attribs[0].Text;
+            }
+        }
+
+        public static T FromText<T>( string text )
+        {
+            FieldInfo[] fields = typeof( T ).GetFields();
+
+            EnumStringAttribute[] attribs;
+
+            foreach( FieldInfo field in fields )
+            {
+                attribs = (EnumStringAttribute[])field.GetCustomAttributes( typeof( EnumStringAttribute ), false );
+
+                foreach( EnumStringAttribute attrib in attribs )
+                {
+                    if( attrib.Text == text )
+                    {
+                        return (T)field.GetValue( null );
+                    }
+                }
+            }
+
+            throw new ArgumentException( "Could not find a matching enumeration value for the text '" + text + "'." );
+        }
+    }
+}

NSspi/NSspi.csproj

@@ -23,6 +23,7 @@
     <WarningLevel>4</WarningLevel>
     <AllowUnsafeBlocks>false</AllowUnsafeBlocks>
     <Prefer32Bit>false</Prefer32Bit>
+    <DocumentationFile>bin\Debug\NSspi.XML</DocumentationFile>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>pdbonly</DebugType>
@@ -42,11 +43,7 @@
     <Reference Include="System.Core" />
     <Reference Include="System.DirectoryServices" />
     <Reference Include="System.DirectoryServices.AccountManagement" />
-    <Reference Include="System.Xml.Linq" />
-    <Reference Include="System.Data.DataSetExtensions" />
-    <Reference Include="Microsoft.CSharp" />
     <Reference Include="System.Data" />
-    <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
     <Compile Include="ByteWriter.cs" />
@@ -58,17 +55,20 @@
     <Compile Include="Contexts\ContextQueryAttrib.cs" />
     <Compile Include="Contexts\ImpersonationHandle.cs" />
     <Compile Include="Contexts\SafeContextHandle.cs" />
+    <Compile Include="Credentials\AuthData.cs" />
+    <Compile Include="Credentials\ClientCurrentCredential.cs" />
     <Compile Include="Credentials\CurrentCredential.cs" />
+    <Compile Include="Credentials\PasswordCredential.cs" />
+    <Compile Include="Credentials\ServerCurrentCredential.cs" />
+    <Compile Include="EnumMgr.cs" />
     <Compile Include="SecPkgInfo.cs" />
     <Compile Include="Contexts\ServerContext.cs" />
-    <Compile Include="Credentials\ClientCredential.cs" />
     <Compile Include="Credentials\Credential.cs" />
     <Compile Include="Credentials\CredentialNativeMethods.cs" />
     <Compile Include="Credentials\CredentialQueryAttrib.cs" />
     <Compile Include="Credentials\CredentialUse.cs" />
     <Compile Include="Credentials\QueryNameSupport.cs" />
     <Compile Include="Credentials\SafeCredentialHandle.cs" />
-    <Compile Include="Credentials\ServerCredential.cs" />
     <Compile Include="NativeMethods.cs" />
     <Compile Include="PackageSupport.cs" />
     <Compile Include="PackageNames.cs" />
@@ -83,7 +83,9 @@
     <Compile Include="SspiHandle.cs" />
     <Compile Include="TimeStamp.cs" />
   </ItemGroup>
-  <ItemGroup />
+  <ItemGroup>
+    <None Include="NSspi.nuspec" />
+  </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
        Other similar extension points exist, see Microsoft.Common.targets.

NSspi/NSspi.nuspec

@@ -0,0 +1,18 @@
+<?xml version="1.0"?>
+<package >
+    <metadata>
+        <id>NSspi</id>
+        <version>0.2.0.0</version>
+        <authors>Kevin Thompson</authors>
+        <owners>Kevin Thompson</owners>
+        <projectUrl>https://github.com/antiduh/nsspi</projectUrl>
+        <requireLicenseAcceptance>false</requireLicenseAcceptance>
+        <description>
+            A C#/.Net interface to the Win32 SSPI authentication API,
+            better known as Windows Integrated Authentication.
+        </description>
+        <language>C#</language>
+        <releaseNotes>Adds support for username/password credentials, but introduces a minor change in the interface that breaks existing code.</releaseNotes>
+        <copyright>Copyright 2017</copyright>
+    </metadata>
+</package>

NSspi/NativeMethods.cs

@@ -1,21 +1,15 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
 using System.Runtime.ConstrainedExecution;
 using System.Runtime.InteropServices;
-using System.Text;
-using System.Threading.Tasks;
-using NSspi.Contexts;
 
 namespace NSspi
 {
     internal static class NativeMethods
     {
-        [ReliabilityContract( Consistency.WillNotCorruptState, Cer.Success)]
+        [ReliabilityContract( Consistency.WillNotCorruptState, Cer.Success )]
         [DllImport( "Secur32.dll", EntryPoint = "FreeContextBuffer", CharSet = CharSet.Unicode )]
         internal static extern SecurityStatus FreeContextBuffer( IntPtr buffer );
 
-
         [ReliabilityContract( Consistency.WillNotCorruptState, Cer.Success )]
         [DllImport( "Secur32.dll", EntryPoint = "QuerySecurityPackageInfo", CharSet = CharSet.Unicode )]
         internal static extern SecurityStatus QuerySecurityPackageInfo( string packageName, ref IntPtr pkgInfo );
@@ -23,6 +17,5 @@ namespace NSspi
         [ReliabilityContract( Consistency.WillNotCorruptState, Cer.Success )]
         [DllImport( "Secur32.dll", EntryPoint = "EnumerateSecurityPackages", CharSet = CharSet.Unicode )]
         internal static extern SecurityStatus EnumerateSecurityPackages( ref int numPackages, ref IntPtr pkgInfoArry );
-
     }
-}
+}

NSspi/PackageNames.cs

@@ -1,8 +1,4 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace NSspi
 {
@@ -26,4 +22,4 @@ namespace NSspi
         /// </summary>
         public const string Ntlm = "NTLM";
     }
-}
+}

NSspi/PackageSupport.cs

@@ -1,10 +1,6 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace NSspi
 {
@@ -24,7 +20,7 @@ namespace NSspi
             SecurityStatus status = SecurityStatus.InternalError;
 
             IntPtr rawInfoPtr;
-            
+
             rawInfoPtr = new IntPtr();
             info = new SecPkgInfo();
 
@@ -35,11 +31,11 @@ namespace NSspi
             {
                 status = NativeMethods.QuerySecurityPackageInfo( packageName, ref rawInfoPtr );
 
-                if ( rawInfoPtr != IntPtr.Zero )
+                if( rawInfoPtr != IntPtr.Zero )
                 {
                     try
                     {
-                        if ( status == SecurityStatus.OK )
+                        if( status == SecurityStatus.OK )
                         {
                             // This performs allocations as it makes room for the strings contained in the SecPkgInfo class.
                             Marshal.PtrToStructure( rawInfoPtr, info );
@@ -71,7 +67,7 @@ namespace NSspi
             IntPtr pkgArrayPtr;
             IntPtr pkgPtr;
             int numPackages = 0;
-            int pkgSize = Marshal.SizeOf( typeof(SecPkgInfo) );
+            int pkgSize = Marshal.SizeOf( typeof( SecPkgInfo ) );
 
             pkgArrayPtr = new IntPtr();
 
@@ -90,7 +86,7 @@ namespace NSspi
                             // Bwooop Bwooop Alocation Alert
                             // 1) We allocate the array
                             // 2) We allocate the individual elements in the array (they're class objects).
-                            // 3) We allocate the strings in the individual elements in the array when we 
+                            // 3) We allocate the strings in the individual elements in the array when we
                             //    call Marshal.PtrToStructure()
 
                             packages = new SecPkgInfo[numPackages];
@@ -99,7 +95,7 @@ namespace NSspi
                             {
                                 packages[i] = new SecPkgInfo();
                             }
-                            
+
                             for( int i = 0; i < numPackages; i++ )
                             {
                                 pkgPtr = IntPtr.Add( pkgArrayPtr, i * pkgSize );
@@ -123,4 +119,4 @@ namespace NSspi
             return packages;
         }
     }
-}
+}

NSspi/Properties/AssemblyInfo.cs

@@ -1,36 +1,35 @@
 using System.Reflection;
-using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 
-// General Information about an assembly is controlled through the following 
+// General Information about an assembly is controlled through the following
 // set of attributes. Change these attribute values to modify the information
 // associated with an assembly.
-[assembly: AssemblyTitle("NSspi")]
-[assembly: AssemblyDescription("")]
-[assembly: AssemblyConfiguration("")]
-[assembly: AssemblyCompany("Kevin Thompson")]
-[assembly: AssemblyProduct("NSspi")]
-[assembly: AssemblyCopyright("Copyright © Kevin Thompson 2014")]
-[assembly: AssemblyTrademark("")]
-[assembly: AssemblyCulture("")]
+[assembly: AssemblyTitle( "NSspi" )]
+[assembly: AssemblyDescription( "" )]
+[assembly: AssemblyConfiguration( "" )]
+[assembly: AssemblyCompany( "Kevin Thompson" )]
+[assembly: AssemblyProduct( "NSspi" )]
+[assembly: AssemblyCopyright( "Copyright © Kevin Thompson 2017" )]
+[assembly: AssemblyTrademark( "" )]
+[assembly: AssemblyCulture( "" )]
 
-// Setting ComVisible to false makes the types in this assembly not visible 
-// to COM components.  If you need to access a type in this assembly from 
+// Setting ComVisible to false makes the types in this assembly not visible
+// to COM components.  If you need to access a type in this assembly from
 // COM, set the ComVisible attribute to true on that type.
-[assembly: ComVisible(false)]
+[assembly: ComVisible( false )]
 
 // The following GUID is for the ID of the typelib if this project is exposed to COM
-[assembly: Guid("9abf710c-c646-42aa-8183-76bfa141a07b")]
+[assembly: Guid( "9abf710c-c646-42aa-8183-76bfa141a07b" )]
 
 // Version information for an assembly consists of the following four values:
 //
 //      Major Version
-//      Minor Version 
+//      Minor Version
 //      Build Number
 //      Revision
 //
-// You can specify all the values or you can default the Build and Revision Numbers 
+// You can specify all the values or you can default the Build and Revision Numbers
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("1.0.0.0")]
-[assembly: AssemblyFileVersion("1.0.0.0")]
+[assembly: AssemblyVersion( "0.2.0.0" )]
+[assembly: AssemblyFileVersion( "0.2.0.0" )]

NSspi/SSPIException.cs

@@ -1,9 +1,5 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
 using System.Runtime.Serialization;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace NSspi
 {
@@ -26,7 +22,7 @@ namespace NSspi
             this.message = message;
             this.errorCode = errorCode;
         }
-        
+
         /// <summary>
         /// Initializes a new instance of the SSPIException class from serialization data.
         /// </summary>
@@ -35,7 +31,7 @@ namespace NSspi
         protected SSPIException( SerializationInfo info, StreamingContext context )
             : base( info, context )
         {
-            this.message = info.GetString( "messsage" );
+            this.message = info.GetString( "message" );
             this.errorCode = (SecurityStatus)info.GetUInt32( "errorCode" );
         }
 
@@ -70,8 +66,13 @@ namespace NSspi
         {
             get
             {
-                return string.Format( "{0}. Error Code = '{1:X}'.", this.message, this.errorCode );
+                return string.Format(
+                    "{0}. Error Code = '0x{1:X}' - \"{2}\".",
+                    this.message,
+                    this.errorCode,
+                    EnumMgr.ToText( this.errorCode )
+                );
             }
         }
     }
-}
+}

NSspi/SecPkgInfo.cs

@@ -1,9 +1,5 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
 using System.Runtime.InteropServices;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace NSspi
 {
@@ -47,55 +43,55 @@ namespace NSspi
     }
 
     /// <summary>
-    /// Describes the capabilities of a security package. 
+    /// Describes the capabilities of a security package.
     /// </summary>
     [Flags]
-    public enum SecPkgCapability : uint 
+    public enum SecPkgCapability : uint
     {
         /// <summary>
         /// Whether the package supports generating messages with integrity information. Required for MakeSignature and VerifySignature.
         /// </summary>
-        Integrity       = 0x1,
+        Integrity = 0x1,
 
         /// <summary>
         /// Whether the package supports generating encrypted messages. Required for EncryptMessage and DecryptMessage.
         /// </summary>
-        Privacy         = 0x2,
+        Privacy = 0x2,
 
         /// <summary>
         /// Whether the package uses any other buffer information than token buffers.
         /// </summary>
-        TokenOnly       = 0x4,
+        TokenOnly = 0x4,
 
         /// <summary>
         /// Whether the package supports datagram-style authentication.
         /// </summary>
-        Datagram        = 0x8,
+        Datagram = 0x8,
 
         /// <summary>
         /// Whether the package supports creating contexts with connection semantics
         /// </summary>
-        Connection      = 0x10,
+        Connection = 0x10,
 
         /// <summary>
         /// Multiple legs are neccessary for authentication.
         /// </summary>
-        MultiLeg        = 0x20,
+        MultiLeg = 0x20,
 
         /// <summary>
         /// Server authentication is not supported.
         /// </summary>
-        ClientOnly      = 0x40,
+        ClientOnly = 0x40,
 
         /// <summary>
         /// Supports extended error handling facilities.
         /// </summary>
-        ExtendedError   = 0x80,
+        ExtendedError = 0x80,
 
         /// <summary>
         /// Supports client impersonation on the server.
         /// </summary>
-        Impersonation   = 0x100,
+        Impersonation = 0x100,
 
         /// <summary>
         /// Understands Windows princple and target names.
@@ -105,45 +101,45 @@ namespace NSspi
         /// <summary>
         /// Supports stream semantics
         /// </summary>
-        Stream          = 0x400,
+        Stream = 0x400,
 
         /// <summary>
         /// Package may be used by the Negiotiate meta-package.
         /// </summary>
-        Negotiable      = 0x800,
+        Negotiable = 0x800,
 
         /// <summary>
         /// Compatible with GSS.
         /// </summary>
-        GssCompatible   = 0x1000,
+        GssCompatible = 0x1000,
 
         /// <summary>
         /// Supports LsaLogonUser
         /// </summary>
-        Logon           = 0x2000,
+        Logon = 0x2000,
 
         /// <summary>
         /// Token buffers are in Ascii format.
         /// </summary>
-        AsciiBuffers    = 0x4000,
+        AsciiBuffers = 0x4000,
 
         /// <summary>
         /// Supports separating large tokens into multiple buffers.
         /// </summary>
-        Fragment        = 0x8000,
+        Fragment = 0x8000,
 
         /// <summary>
         /// Supports mutual authentication between a client and server.
         /// </summary>
-        MutualAuth      = 0x10000,
+        MutualAuth = 0x10000,
 
         /// <summary>
         /// Supports credential delegation from the server to a third context.
         /// </summary>
-        Delegation      = 0x20000,
+        Delegation = 0x20000,
 
         /// <summary>
-        /// Supports calling EncryptMessage with the read-only-checksum flag, which protects data only 
+        /// Supports calling EncryptMessage with the read-only-checksum flag, which protects data only
         /// with a checksum and does not encrypt it.
         /// </summary>
         ReadOnlyChecksum = 0x40000,
@@ -157,11 +153,11 @@ namespace NSspi
         /// <summary>
         /// Extends the negotiate package; only one such package may be registered at any time.
         /// </summary>
-        ExtendsNego     = 0x00100000,
+        ExtendsNego = 0x00100000,
 
         /// <summary>
         /// This package is negotiated by the package of type ExtendsNego.
         /// </summary>
-        Negotiable2     = 0x00200000,
+        Negotiable2 = 0x00200000,
     }
-}
+}

NSspi/SecureBuffer/SecureBuffer.cs

@@ -1,9 +1,5 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
 using System.Runtime.InteropServices;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace NSspi.Buffers
 {
@@ -37,10 +33,10 @@ namespace NSspi.Buffers
     /// </summary>
     /// <remarks>The buffer is translated into a SecureBufferInternal for the actual call.
     /// To keep the call setup code simple, and to centralize the buffer pinning code,
-    /// this class stores and returns buffers as regular byte arrays. The buffer 
+    /// this class stores and returns buffers as regular byte arrays. The buffer
     /// pinning support code in SecureBufferAdapter handles conversion to SecureBufferInternal
     /// for pass to the managed api, as well as pinning relevant chunks of memory.
-    /// 
+    ///
     /// Furthermore, the native API may not use the entire buffer, and so a mechanism
     /// is needed to communicate the usage of the buffer separate from the length
     /// of the buffer.</remarks>
@@ -50,7 +46,7 @@ namespace NSspi.Buffers
         /// Initializes a new instance of the SecureBuffer class.
         /// </summary>
         /// <param name="buffer">The buffer to wrap.</param>
-        /// <param name="type">The type or purpose of the buffer, for purposes of 
+        /// <param name="type">The type or purpose of the buffer, for purposes of
         /// invoking the native API.</param>
         public SecureBuffer( byte[] buffer, BufferType type )
         {
@@ -75,4 +71,4 @@ namespace NSspi.Buffers
         /// </summary>
         public int Length { get; internal set; }
     }
-}
+}

NSspi/SecureBuffer/SecureBufferAdapter.cs

@@ -1,10 +1,7 @@
 using System;
 using System.Collections.Generic;
-using System.Linq;
 using System.Runtime.ConstrainedExecution;
 using System.Runtime.InteropServices;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace NSspi.Buffers
 {
@@ -13,52 +10,52 @@ namespace NSspi.Buffers
     /// </summary>
     /// <remarks>
     /// The native APIs consume lists of buffers, with each buffer indicating its type or purpose.
-    /// 
+    ///
     /// The buffers themselves are simple byte arrays, and the native APIs consume arrays of buffers.
-    /// 
+    ///
     /// Since winapi calling convention, perhaps as an extension of C calling convention, does not
     /// provide a standard convention means of communicating the length of any array, custom structures
     /// must be created to carry the buffer length and usage.
-    /// 
+    ///
     /// Not only does the API need to know how long each buffer is, and how long the array of buffers is,
     /// it needs to communicate back how much of each buffer was filled; we may provide it a token buffer
     /// that is 12288 bytes long, but it might only use 125 bytes of that, which we need a way of knowing.
-    /// 
-    /// As a result of this, the API requires byte arrays to be carried in structs that are natively known as 
+    ///
+    /// As a result of this, the API requires byte arrays to be carried in structs that are natively known as
     /// SecureBuffers (known as SecureBufferInternal in this project), and then arrays of SecureBuffers are
     /// carried in a SecureBufferDescriptor structure.
-    /// 
+    ///
     /// As such, this class has to do a significant amount of marshaling work just to get the buffers back and
     /// forth to the native APIs.
     ///   * We have to pin all buffers
     ///   * We have to pin the array of buffers
     ///   * We have to obtain IntPtr handles to each of the buffers and to the array of buffers.
-    ///   * Since we provide EasyToUse SecureBuffer classes from the rest of the project, but we 
+    ///   * Since we provide EasyToUse SecureBuffer classes from the rest of the project, but we
     ///     provide SecureBufferInternal structures from the native API, we have to copy back values
     ///     from the SecureBufferInternal structs to our SecureBuffer class.
-    ///     
+    ///
     /// To make this class easy to use, it accepts either one or many buffers as its constructor; and
-    /// implements IDisposable to know when to marshal values back from the unmanaged structures and to 
-    /// release pinned handles. 
-    /// 
+    /// implements IDisposable to know when to marshal values back from the unmanaged structures and to
+    /// release pinned handles.
+    ///
     /// Additionally, in case the adapter is leaked without disposing, the adapter implements a Critical
     /// Finalizer, to ensure that the GCHandles are released, else we will permanently pin handles.
-    /// 
+    ///
     /// The typical flow is to take one or many buffers; create and fill the neccessary unmanaged structures;
     /// pin memory; acquire the IntPtr handles; let the caller access the top-level IntPtr representing
     /// the SecureBufferDescriptor, to provide to the native APIs; wait for the caller to invoke the native
     /// API; wait for the caller to invoke our Dispose; marshal back any data from the native structures
     /// (buffer write counts); release all GCHandles to unpin memory.
-    /// 
+    ///
     /// The total descriptor structure is as follows:
-    /// |-- Descriptor handle 
+    /// |-- Descriptor handle
     ///     |-- Array of buffers
     ///         |-- Buffer 1
     ///         |-- Buffer 2
     ///         ...
     ///         |-- Buffer N.
-    ///         
-    /// Each object in that structure must be pinned and passed as an IntPtr to the native APIs. 
+    ///
+    /// Each object in that structure must be pinned and passed as an IntPtr to the native APIs.
     /// All this to pass what boils down to a List of byte arrays..
     /// </remarks>
     internal sealed class SecureBufferAdapter : CriticalFinalizerObject, IDisposable
@@ -120,7 +117,7 @@ namespace NSspi.Buffers
             this.bufferHandles = new GCHandle[this.buffers.Count];
             this.bufferCarrier = new SecureBufferInternal[this.buffers.Count];
 
-            for ( int i = 0; i < this.buffers.Count; i++ )
+            for( int i = 0; i < this.buffers.Count; i++ )
             {
                 this.bufferHandles[i] = GCHandle.Alloc( this.buffers[i].Buffer, GCHandleType.Pinned );
 
@@ -156,7 +153,7 @@ namespace NSspi.Buffers
         {
             get
             {
-                if ( this.disposed )
+                if( this.disposed )
                 {
                     throw new ObjectDisposedException( "Cannot use SecureBufferListHandle after it has been disposed" );
                 }
@@ -184,11 +181,11 @@ namespace NSspi.Buffers
         [ReliabilityContract( Consistency.WillNotCorruptState, Cer.Success )]
         private void Dispose( bool disposing )
         {
-            if ( this.disposed == true ) { return; }
+            if( this.disposed == true ) { return; }
 
-            if ( disposing )
+            if( disposing )
             {
-                // When this class is actually being used for its original purpose - to convey buffers 
+                // When this class is actually being used for its original purpose - to convey buffers
                 // back and forth to SSPI calls - we need to copy the potentially modified structure members
                 // back to our caller's buffer.
                 for( int i = 0; i < this.buffers.Count; i++ )
@@ -218,4 +215,4 @@ namespace NSspi.Buffers
             this.disposed = true;
         }
     }
-}
+}

NSspi/SecureBuffer/SecureBufferDataRep.cs

@@ -1,8 +1,4 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace NSspi.Buffers
 {
@@ -22,4 +18,4 @@ namespace NSspi.Buffers
         /// </summary>
         Network = 0x00
     }
-}
+}

NSspi/SecureBuffer/SecureBufferDesc.cs

@@ -1,10 +1,5 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Runtime.ConstrainedExecution;
 using System.Runtime.InteropServices;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace NSspi.Buffers
 {
@@ -12,7 +7,7 @@ namespace NSspi.Buffers
     /// Represents the native layout of the secure buffer descriptor that is provided directly
     /// to native API calls.
     /// </summary>
-    [StructLayout( LayoutKind.Sequential)]
+    [StructLayout( LayoutKind.Sequential )]
     internal struct SecureBufferDescInternal
     {
         /// <summary>
@@ -35,4 +30,4 @@ namespace NSspi.Buffers
         /// </summary>
         public const int ApiVersion = 0;
     }
-}
+}

NSspi/SecureBuffer/SecureBufferType.cs

@@ -1,8 +1,4 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace NSspi.Buffers
 {
@@ -38,7 +34,7 @@ namespace NSspi.Buffers
 
         /// <summary>
         /// The buffer passed to an API call contained more data than was necessary for completing the action,
-        /// such as the case when a streaming-mode connection that does not preserve message bounders, such as TCP 
+        /// such as the case when a streaming-mode connection that does not preserve message bounders, such as TCP
         /// is used as the transport. The extra data is returned back to the caller in a buffer of this type.
         /// </summary>
         Extra = 0x05,
@@ -57,7 +53,7 @@ namespace NSspi.Buffers
         Stream = 0x0A,
         ChannelBindings = 0x0E,
         TargetHost = 0x10,
-        ReadOnlyFlag = unchecked( (int)0x80000000 ),
+        ReadOnlyFlag = unchecked((int)0x80000000),
         ReadOnlyWithChecksum = 0x10000000
     }
-}
+}

NSspi/SecurityStatus.cs

@@ -1,13 +1,9 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace NSspi
 {
     /*
-    // From winerror.h 
+    // From winerror.h
     #define SEC_E_OK                         ((HRESULT)0x00000000L)
     #define SEC_E_INSUFFICIENT_MEMORY        _HRESULT_TYPEDEF_(0x80090300L)
     #define SEC_E_INVALID_HANDLE             _HRESULT_TYPEDEF_(0x80090301L)
@@ -30,56 +26,99 @@ namespace NSspi
         /// <summary>
         /// The request completed successfully
         /// </summary>
-        OK                  = 0x00000000,
-        
+        [EnumString( "No error" )]
+        OK = 0x00000000,
+
         /// <summary>
         /// The token returned by the context needs to be provided to the cooperating party
         /// to continue construction of the context.
         /// </summary>
-        ContinueNeeded      = 0x00090312,
+        [EnumString( "Authentication cycle needs to continue" )]
+        ContinueNeeded = 0x00090312,
 
         /// <summary>
         /// Occurs after a client calls InitializeSecurityContext to indicate that the client
         /// must call CompleteAuthToken.
         /// </summary>
-        CompleteNeeded      = 0x00090313,
+        [EnumString( "Authentication cycle needs to perform a 'complete'." )]
+        CompleteNeeded = 0x00090313,
 
         /// <summary>
         /// Occurs after a client calls InitializeSecurityContext to indicate that the client
         /// must call CompleteAuthToken and pass the result to the server.
         /// </summary>
-        CompAndContinue     = 0x00090314,
+        [EnumString( "Authentication cycle needs to perform a 'complete' and then continue." )]
+        CompAndContinue = 0x00090314,
 
         /// <summary>
         /// An attempt to use the context was performed after the context's expiration time elapsed.
         /// </summary>
-        ContextExpired      = 0x00090317,
-        CredentialsNeeded   = 0x00090320,
-        Renegotiate         = 0x00090321,
+        [EnumString( "The security context was used after its expiration time passed." )]
+        ContextExpired = 0x00090317,
+
+        [EnumString( "The credentials supplied to the security context were not fully initialized." )]
+        CredentialsNeeded = 0x00090320,
+
+        [EnumString( "The context data must be re-negotiated with the peer" )]
+        Renegotiate = 0x00090321,
 
         // Errors
-        OutOfMemory         = 0x80090300,
-        InvalidHandle       = 0x80090301,
-        Unsupported         = 0x80090302,
-        TargetUnknown       = 0x80090303,
-        InternalError       = 0x80090304,
+        [EnumString( "Not enough memory." )]
+        OutOfMemory = 0x80090300,
+
+        [EnumString( "The handle provided to the API was invalid." )]
+        InvalidHandle = 0x80090301,
+
+        [EnumString( "The attempted operation is not supported" )]
+        Unsupported = 0x80090302,
+
+        [EnumString( "The specified principle is not known in the authentication system." )]
+        TargetUnknown = 0x80090303,
+
+        [EnumString( "An internal error occurred" )]
+        InternalError = 0x80090304,
 
         /// <summary>
         /// No security provider package was found with the given name.
         /// </summary>
-        PackageNotFound     = 0x80090305,
+        [EnumString( "The requested security package was not found." )]
+        PackageNotFound = 0x80090305,
 
-        NotOwner            = 0x80090306,
-        CannotInstall       = 0x80090307,
-        InvalidToken        = 0x80090308,
-        CannotPack          = 0x80090309,
-        QopNotSupported     = 0x8009030A,
-        NoImpersonation     = 0x8009030B,
-        LogonDenied         = 0x8009030C,
-        UnknownCredentials  = 0x8009030D,
-        NoCredentials       = 0x8009030E,
-        MessageAltered      = 0x8009030F,
-        OutOfSequence       = 0x80090310,
+        NotOwner = 0x80090306,
+        CannotInstall = 0x80090307,
+
+        /// <summary>
+        /// A token was provided that contained incorrect or corrupted data.
+        /// </summary>
+        [EnumString( "The provided authentication token is invalid or corrupted." )]
+        InvalidToken = 0x80090308,
+
+        CannotPack = 0x80090309,
+        QopNotSupported = 0x8009030A,
+
+        /// <summary>
+        /// Impersonation is not supported.
+        /// </summary>
+        [EnumString( "Impersonation is not supported with the current security package." )]
+        NoImpersonation = 0x8009030B,
+
+        [EnumString( "The logon was denied, perhaps because the provided credentials were incorrect." )]
+        LogonDenied = 0x8009030C,
+
+        [EnumString( "The credentials provided are not recognized by the selected security package." )]
+        UnknownCredentials = 0x8009030D,
+
+        [EnumString( "No credentials are available in the selected security package." )]
+        NoCredentials = 0x8009030E,
+
+        [EnumString( "A message that was provided to the Decrypt or VerifySignature functions was altered " +
+        "after it was created." )]
+        MessageAltered = 0x8009030F,
+
+        [EnumString( "A message was received out of the expected order." )]
+        OutOfSequence = 0x80090310,
+
+        [EnumString( "The current security package cannot contact an authenticating authority." )]
         NoAuthenticatingAuthority = 0x80090311,
 
         /// <summary>
@@ -88,25 +127,26 @@ namespace NSspi
         /// <remarks>
         /// This occurs regularly with SSPI contexts that exchange data using a streaming context,
         /// where the data returned from the streaming communications channel, such as a TCP socket,
-        /// did not contain the complete message. 
+        /// did not contain the complete message.
         /// Similarly, a streaming channel may return too much data, in which case the API function
         /// will indicate success, but will save off the extra, unrelated data in a buffer of
         /// type 'extra'.
         /// </remarks>
-        IncompleteMessage   = 0x80090318,
+        IncompleteMessage = 0x80090318,
+
         IncompleteCredentials = 0x80090320,
-        BufferNotEnough     = 0x80090321,
-        WrongPrincipal      = 0x80090322,
-        TimeSkew            = 0x80090324,
-        UntrustedRoot       = 0x80090325,
-        IllegalMessage      = 0x80090326,
-        CertUnknown         = 0x80090327,
-        CertExpired         = 0x80090328,
-        AlgorithmMismatch   = 0x80090331,
-        SecurityQosFailed   = 0x80090332,
+        BufferNotEnough = 0x80090321,
+        WrongPrincipal = 0x80090322,
+        TimeSkew = 0x80090324,
+        UntrustedRoot = 0x80090325,
+        IllegalMessage = 0x80090326,
+        CertUnknown = 0x80090327,
+        CertExpired = 0x80090328,
+        AlgorithmMismatch = 0x80090331,
+        SecurityQosFailed = 0x80090332,
         SmartcardLogonRequired = 0x8009033E,
-        UnsupportedPreauth  = 0x80090343,
-        BadBinding          = 0x80090346
+        UnsupportedPreauth = 0x80090343,
+        BadBinding = 0x80090346
     }
 
     /// <summary>
@@ -124,5 +164,4 @@ namespace NSspi
             return (uint)status > 0x80000000u;
         }
     }
-
-}
+}

NSspi/SspiHandle.cs

@@ -1,31 +1,25 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Runtime.CompilerServices;
 using System.Runtime.ConstrainedExecution;
 using System.Runtime.InteropServices;
-using System.Text;
-using System.Threading.Tasks;
-using NSspi.Contexts;
 
 namespace NSspi
 {
     /// <summary>
-    /// Represents the raw structure for any handle created for the SSPI API, for example, credential 
-    /// handles, context handles, and security package handles. Any SSPI handle is always the size 
-    /// of two native pointers. 
+    /// Represents the raw structure for any handle created for the SSPI API, for example, credential
+    /// handles, context handles, and security package handles. Any SSPI handle is always the size
+    /// of two native pointers.
     /// </summary>
     /// <remarks>
     /// The documentation for SSPI handles can be found here:
     /// http://msdn.microsoft.com/en-us/library/windows/desktop/aa380495(v=vs.85).aspx
-    /// 
+    ///
     /// This class is not reference safe - if used directly, or referenced directly, it may be leaked,
     /// or subject to finalizer races, or any of the hundred of things SafeHandles were designed to fix.
     /// Do not directly use this class - use only though SafeHandle wrapper objects. Any reference needed
     /// to this handle for performing work (InitializeSecurityContext, eg) should be performed a CER
     /// that employs handle reference counting across the native API invocation.
     /// </remarks>
-    [StructLayout( LayoutKind.Sequential, Pack = 1 ) ]
+    [StructLayout( LayoutKind.Sequential, Pack = 1 )]
     internal struct RawSspiHandle
     {
         private IntPtr lowPart;
@@ -46,7 +40,7 @@ namespace NSspi
         /// <remarks>
         /// This method is executed in a CER during handle release.
         /// </remarks>
-        [ReliabilityContract( Consistency.WillNotCorruptState, Cer.Success)]
+        [ReliabilityContract( Consistency.WillNotCorruptState, Cer.Success )]
         public void SetInvalid()
         {
             this.lowPart = IntPtr.Zero;
@@ -69,7 +63,7 @@ namespace NSspi
 
         public override bool IsInvalid
         {
-            get { return IsClosed || this.rawHandle.IsZero();  }
+            get { return IsClosed || this.rawHandle.IsZero(); }
         }
 
         [ReliabilityContract( Consistency.WillNotCorruptState, Cer.Success )]
@@ -79,4 +73,4 @@ namespace NSspi
             return true;
         }
     }
-}
+}

NSspi/TimeStamp.cs

@@ -1,14 +1,10 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
 using System.Runtime.InteropServices;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace NSspi
 {
     /// <summary>
-    /// Represents a Windows API Timestamp structure, which stores time in units of 100 nanosecond 
+    /// Represents a Windows API Timestamp structure, which stores time in units of 100 nanosecond
     /// ticks, counting from January 1st, year 1601 at 00:00 UTC. Time is stored as a 64-bit value.
     /// </summary>
     [StructLayout( LayoutKind.Sequential )]
@@ -29,13 +25,13 @@ namespace NSspi
         /// <returns></returns>
         public DateTime ToDateTime()
         {
-            ulong test = (ulong)this.time + (ulong)(Epoch.Ticks);
+            ulong test = (ulong)this.time + (ulong)( Epoch.Ticks );
 
-            // Sometimes the value returned is massive, eg, 0x7fffff154e84ffff, which is a value 
+            // Sometimes the value returned is massive, eg, 0x7fffff154e84ffff, which is a value
             // somewhere in the year 30848. This would overflow DateTime, since it peaks at 31-Dec-9999.
             // It turns out that this value corresponds to a TimeStamp's maximum value, reduced by my local timezone
             // http://stackoverflow.com/questions/24478056/
-            if ( test > (ulong)DateTime.MaxValue.Ticks )
+            if( test > (ulong)DateTime.MaxValue.Ticks )
             {
                 return DateTime.MaxValue;
             }
@@ -45,4 +41,4 @@ namespace NSspi
             }
         }
     }
-}
+}

NsspiDemo/.gitignore

@@ -0,0 +1,2 @@
+bin
+obj

NsspiDemo/App.config

@@ -1,6 +1,6 @@
 <?xml version="1.0"?>
 <configuration>
-    <startup> 
-        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>
-    </startup>
-</configuration>
+  <startup>
+    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0" />
+  </startup>
+</configuration>

NsspiDemo/Program.cs

@@ -16,10 +16,10 @@ namespace NSspi
 
         private static void CredTest( string packageName )
         {
-            ClientCredential clientCred = null;
+            ClientCurrentCredential clientCred = null;
             ClientContext client = null;
 
-            ServerCredential serverCred = null;
+            ServerCurrentCredential serverCred = null;
             ServerContext server = null;
 
             byte[] clientToken;
@@ -30,24 +30,23 @@ namespace NSspi
 
             try
             {
-                clientCred = new ClientCredential( packageName );
-                serverCred = new ServerCredential( packageName );
+                clientCred = new ClientCurrentCredential( packageName );
+                serverCred = new ServerCurrentCredential( packageName );
 
                 Console.Out.WriteLine( clientCred.PrincipleName );
 
-                client = new ClientContext( 
-                    clientCred, 
-                    serverCred.PrincipleName, 
-                    ContextAttrib.MutualAuth | 
+                client = new ClientContext(
+                    clientCred,
+                    serverCred.PrincipleName,
+                    ContextAttrib.MutualAuth |
                     ContextAttrib.InitIdentify |
                     ContextAttrib.Confidentiality |
                     ContextAttrib.ReplayDetect |
-                    ContextAttrib.SequenceDetect | 
+                    ContextAttrib.SequenceDetect |
                     ContextAttrib.Connection |
                     ContextAttrib.Delegate
                 );
 
-
                 server = new ServerContext(
                     serverCred,
                     ContextAttrib.MutualAuth |
@@ -64,18 +63,17 @@ namespace NSspi
 
                 clientStatus = client.Init( serverToken, out clientToken );
 
-                while ( true )
+                while( true )
                 {
                     serverStatus = server.AcceptToken( clientToken, out serverToken );
 
-                    if ( serverStatus != SecurityStatus.ContinueNeeded && clientStatus != SecurityStatus.ContinueNeeded ) { break; }
+                    if( serverStatus != SecurityStatus.ContinueNeeded && clientStatus != SecurityStatus.ContinueNeeded ) { break; }
 
                     clientStatus = client.Init( serverToken, out clientToken );
 
-                    if ( serverStatus != SecurityStatus.ContinueNeeded && clientStatus != SecurityStatus.ContinueNeeded ) { break; }
+                    if( serverStatus != SecurityStatus.ContinueNeeded && clientStatus != SecurityStatus.ContinueNeeded ) { break; }
                 }
 
-
                 Console.Out.WriteLine( "Server authority: " + server.AuthorityName );
                 Console.Out.WriteLine( "Server context user: " + server.ContextUserName );
 
@@ -102,7 +100,7 @@ namespace NSspi
                     throw new Exception();
                 }
 
-                for( int i= 0; i < plainText.Length; i++ )
+                for( int i = 0; i < plainText.Length; i++ )
                 {
                     if( plainText[i] != roundTripPlaintext[i] )
                     {
@@ -117,25 +115,23 @@ namespace NSspi
                     throw new Exception();
                 }
 
-
                 using( server.ImpersonateClient() )
                 {
-
                 }
 
                 cipherText = client.MakeSignature( plainText );
 
                 bool goodSig = server.VerifySignature( cipherText, out roundTripPlaintext );
 
-                if ( goodSig == false ||
+                if( goodSig == false ||
                      roundTripPlaintext.Length != plainText.Length )
                 {
                     throw new Exception();
                 }
-                
-                for ( int i = 0; i < plainText.Length; i++ )
+
+                for( int i = 0; i < plainText.Length; i++ )
                 {
-                    if ( plainText[i] != roundTripPlaintext[i] )
+                    if( plainText[i] != roundTripPlaintext[i] )
                     {
                         throw new Exception();
                     }
@@ -145,12 +141,12 @@ namespace NSspi
             }
             finally
             {
-                if ( server != null )
+                if( server != null )
                 {
                     server.Dispose();
                 }
 
-                if ( client != null )
+                if( client != null )
                 {
                     client.Dispose();
                 }
@@ -160,11 +156,11 @@ namespace NSspi
                     clientCred.Dispose();
                 }
 
-                if ( serverCred != null )
+                if( serverCred != null )
                 {
                     serverCred.Dispose();
                 }
             }
         }
     }
-}
+}

NsspiDemo/Properties/AssemblyInfo.cs

@@ -1,8 +1,7 @@
 using System.Reflection;
-using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 
-// General Information about an assembly is controlled through the following 
+// General Information about an assembly is controlled through the following
 // set of attributes. Change these attribute values to modify the information
 // associated with an assembly.
 [assembly: AssemblyTitle( "NsspiDemo" )]
@@ -14,8 +13,8 @@ using System.Runtime.InteropServices;
 [assembly: AssemblyTrademark( "" )]
 [assembly: AssemblyCulture( "" )]
 
-// Setting ComVisible to false makes the types in this assembly not visible 
-// to COM components.  If you need to access a type in this assembly from 
+// Setting ComVisible to false makes the types in this assembly not visible
+// to COM components.  If you need to access a type in this assembly from
 // COM, set the ComVisible attribute to true on that type.
 [assembly: ComVisible( false )]
 
@@ -25,12 +24,12 @@ using System.Runtime.InteropServices;
 // Version information for an assembly consists of the following four values:
 //
 //      Major Version
-//      Minor Version 
+//      Minor Version
 //      Build Number
 //      Revision
 //
-// You can specify all the values or you can default the Build and Revision Numbers 
+// You can specify all the values or you can default the Build and Revision Numbers
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
 [assembly: AssemblyVersion( "1.0.0.0" )]
-[assembly: AssemblyFileVersion( "1.0.0.0" )]
+[assembly: AssemblyFileVersion( "1.0.0.0" )]

Readme.txt

@@ -1,70 +0,0 @@
-This projects provides a C# / .Net interface to the Windows Integrated Authentication API, 
-better known as SSPI (Security Service Provider Interface).
-
-The project is provided as a .Net 4.0 assembly, but can just as easily be upgraded to .Net 4.5 
-or later. The solution file can be opened by Visual Studio 2010 SP1, Visual Studio 2012, or 
-later Visual Studio editions.
-
-The SSPI API provides an interface for real authentication protocols, such as Kerberos or 
-NTLM, to be invoked transparently by client and server code in order to perform authentication
-and message manipulation. These authentication protocols are better known as 'security packages'.
-
-The SSPI API exposes these packages using a common API, and so a program may invoke one or the 
-other with only minor changes in implementation. SSPI also supports the 'negotiate' 'meta' 
-package, that allows a client and server to decide dynamically which real security provider to 
-use, and then itself provides a passthrough interface to the real package.
-
-==== Usage ====
-
-Typically, a client acquires some form of a credential, either from the currently logged on
-user's security context, by acquiring a username and password from the user, or by some other
-means. The server acquires a credential in a similar manner. Each uses their credentials to 
-identify themselves to each other.
-
-A client and a server each start with uninitialized security contexts. They exchange negotiation
-and authentication tokens to perform authentication, and if all succeeds, they create a shared 
-security context in the form of a client's context and a server's context. The effectively shared
-context agrees on the security package to use (kerberos, NTLM), and what parameters to use 
-for message passing. Every new client that authenticates with a server creates a new security 
-context specific to that client-server pairing.
-
-From the software perspective, a client security context initializes itself by exchanging 
-authentication tokens with a server; the server initializes itself by exchanging authentication
-tokens with the client.
-
-This API provides raw access to the authentication tokens created during the negotiation and 
-authentication process. In this manner, any application can integrate SSPI-based authentication
-by deciding for themselves how to integrate the tokens into their application protocol.
-
-The project is broken up into 3 chunks:
-
- * The NSspi library, which provides safe, managed access to the SSPI API.
- * NsspiDemo, a quick demo program to show how to exercise the features of NSspi locally.
- * UI demo programs TestClient and TestServer (that have a common dependency on TestProtocol) that
-   may be run on separate machines, that show how one might integrate SSPI into a custom 
-   application.
-
-==== More information ====
-
-If you would like to understand the SSPI API, feel free to browse the following references:
-
-MSDN documentation on the SSPI API
-	http://msdn.microsoft.com/en-us/library/windows/desktop/aa374731(v=vs.85).aspx
-
-MSDN article on SSPI along with a sample Managed C++ SSPI library and UI client/servers.
-	http://msdn.microsoft.com/en-us/library/ms973911.aspx
-
-Relevant StackOverflow questions:
-"Client-server authentication - using SSPI?"
-  - http://stackoverflow.com/questions/17241365/
-
-"Validate Windows Identity Token"
-  - http://stackoverflow.com/questions/11238141/
-
-"How to deal with allocations in constrained execution regions?"
-  - http://stackoverflow.com/questions/24442209/
-
-"AcquireCredentialsHandle returns massive expiration time"
-  - http://stackoverflow.com/questions/24478056/
-
-

TestClient/.gitignore

@@ -0,0 +1,2 @@
+bin
+obj

TestClient/App.config

@@ -1,6 +1,6 @@
 <?xml version="1.0"?>
 <configuration>
-    <startup> 
-        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>
-    </startup>
-</configuration>
+  <startup>
+    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0" />
+  </startup>
+</configuration>

TestClient/ClientForm.cs

@@ -1,12 +1,6 @@
 using System;
-using System.Collections.Generic;
-using System.ComponentModel;
-using System.Data;
-using System.Drawing;
-using System.Linq;
 using System.Net.Sockets;
 using System.Text;
-using System.Threading.Tasks;
 using System.Windows.Forms;
 using NSspi;
 using NSspi.Contexts;
@@ -20,7 +14,7 @@ namespace TestClient
     public partial class ClientForm : Form
     {
         private ClientContext context;
-        private ClientCredential cred;
+        private ClientCurrentCredential cred;
 
         private CustomConnection connection;
 
@@ -48,16 +42,16 @@ namespace TestClient
             this.FormClosing += Form1_FormClosing;
 
             // --- SSPI ---
-            this.cred = new ClientCredential( PackageNames.Negotiate );
+            this.cred = new ClientCurrentCredential( PackageNames.Negotiate );
 
             this.context = new ClientContext(
                 cred,
                 "",
-                ContextAttrib.InitIntegrity | 
-                ContextAttrib.ReplayDetect | 
-                ContextAttrib.SequenceDetect | 
-                ContextAttrib.MutualAuth | 
-                ContextAttrib.Delegate | 
+                ContextAttrib.InitIntegrity |
+                ContextAttrib.ReplayDetect |
+                ContextAttrib.SequenceDetect |
+                ContextAttrib.MutualAuth |
+                ContextAttrib.Delegate |
                 ContextAttrib.Confidentiality
             );
 
@@ -107,7 +101,6 @@ namespace TestClient
                         throw;
                     }
                 }
-
             }
         }
 
@@ -116,7 +109,6 @@ namespace TestClient
             this.connection.Stop();
         }
 
-
         private void encryptButton_Click( object sender, EventArgs e )
         {
             byte[] plaintext;
@@ -149,7 +141,7 @@ namespace TestClient
 
         private void connection_Received( Message message )
         {
-            this.Invoke( (Action)delegate()
+            this.Invoke( (Action)delegate ()
             {
                 if( message.Operation == ProtocolOp.ServerToken )
                 {
@@ -180,11 +172,11 @@ namespace TestClient
             this.initializing = false;
             this.lastServerToken = null;
 
-            this.BeginInvoke( (Action)delegate()
+            this.BeginInvoke( (Action)delegate ()
             {
                 this.context.Dispose();
-                this.context = new ClientContext( 
-                    this.cred, 
+                this.context = new ClientContext(
+                    this.cred,
                     "",
                     ContextAttrib.InitIntegrity |
                     ContextAttrib.ReplayDetect |
@@ -195,9 +187,9 @@ namespace TestClient
                 );
 
                 UpdateButtons();
-            });
+            } );
         }
-        
+
         private void DoInit()
         {
             SecurityStatus status;
@@ -253,4 +245,4 @@ namespace TestClient
             this.signButton.Enabled = this.connected;
         }
     }
-}
+}

TestClient/Program.cs

@@ -1,22 +1,19 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
 using System.Windows.Forms;
 
 namespace TestClient
 {
-    static class Program
+    internal static class Program
     {
         /// <summary>
         /// The main entry point for the application.
         /// </summary>
         [STAThread]
-        static void Main()
+        private static void Main()
         {
             Application.EnableVisualStyles();
             Application.SetCompatibleTextRenderingDefault( false );
             Application.Run( new ClientForm() );
         }
     }
-}
+}

TestClient/Properties/AssemblyInfo.cs

@@ -1,8 +1,7 @@
 using System.Reflection;
-using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 
-// General Information about an assembly is controlled through the following 
+// General Information about an assembly is controlled through the following
 // set of attributes. Change these attribute values to modify the information
 // associated with an assembly.
 [assembly: AssemblyTitle( "TestClient" )]
@@ -14,8 +13,8 @@ using System.Runtime.InteropServices;
 [assembly: AssemblyTrademark( "" )]
 [assembly: AssemblyCulture( "" )]
 
-// Setting ComVisible to false makes the types in this assembly not visible 
-// to COM components.  If you need to access a type in this assembly from 
+// Setting ComVisible to false makes the types in this assembly not visible
+// to COM components.  If you need to access a type in this assembly from
 // COM, set the ComVisible attribute to true on that type.
 [assembly: ComVisible( false )]
 
@@ -25,11 +24,11 @@ using System.Runtime.InteropServices;
 // Version information for an assembly consists of the following four values:
 //
 //      Major Version
-//      Minor Version 
+//      Minor Version
 //      Build Number
 //      Revision
 //
-// You can specify all the values or you can default the Build and Revision Numbers 
+// You can specify all the values or you can default the Build and Revision Numbers
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
 [assembly: AssemblyVersion( "1.0.0.0" )]

TestProtocol/.gitignore

@@ -0,0 +1,2 @@
+bin
+obj

TestProtocol/App.config

@@ -1,6 +1,6 @@
 <?xml version="1.0"?>
 <configuration>
-    <startup> 
-        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>
-    </startup>
-</configuration>
+  <startup>
+    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0" />
+  </startup>
+</configuration>

TestProtocol/CustomConnection.cs

@@ -1,10 +1,6 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
 using System.Net.Sockets;
-using System.Text;
 using System.Threading;
-using System.Threading.Tasks;
 using System.Windows.Forms;
 using NSspi;
 
@@ -13,7 +9,7 @@ namespace TestProtocol
     public class CustomConnection
     {
         private Thread receiveThread;
-        
+
         private Socket socket;
 
         private bool running;
@@ -24,7 +20,7 @@ namespace TestProtocol
         }
 
         public delegate void ReceivedAction( Message message );
-        
+
         public event ReceivedAction Received;
 
         public event Action Disconnected;
@@ -33,7 +29,7 @@ namespace TestProtocol
         {
             if( this.running )
             {
-                throw new InvalidOperationException("Already running");
+                throw new InvalidOperationException( "Already running" );
             }
 
             this.socket = new Socket( AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp );
@@ -65,7 +61,7 @@ namespace TestProtocol
                 throw new InvalidOperationException( "Not connected" );
             }
 
-            byte[] outBuffer = new byte[ message.Data.Length + 8 ];
+            byte[] outBuffer = new byte[message.Data.Length + 8];
             int position = 0;
 
             ByteWriter.WriteInt32_BE( (int)message.Operation, outBuffer, position );
@@ -124,16 +120,15 @@ namespace TestProtocol
                     //                          |--4 bytes--|--4 bytes--|---N--|
                     // Every command is a TLV - | Operation |  Length   | Data |
 
-
                     // Read the operation.
                     this.socket.Receive( readBuffer, 4, SocketFlags.None );
 
                     // Check if we popped out of a receive call after we were shut down.
                     if( this.running == false ) { break; }
-                    
+
                     operation = (ProtocolOp)ByteWriter.ReadInt32_BE( readBuffer, 0 );
 
-                    // Read the length 
+                    // Read the length
                     this.socket.Receive( readBuffer, 4, SocketFlags.None );
                     messageLength = ByteWriter.ReadInt32_BE( readBuffer, 0 );
 
@@ -153,14 +148,13 @@ namespace TestProtocol
                         remaining -= chunkLength;
                         position += chunkLength;
                     }
-
                 }
                 catch( SocketException e )
                 {
                     if( e.SocketErrorCode == SocketError.ConnectionAborted ||
                         e.SocketErrorCode == SocketError.Interrupted ||
                         e.SocketErrorCode == SocketError.OperationAborted ||
-                        e.SocketErrorCode == SocketError.Shutdown || 
+                        e.SocketErrorCode == SocketError.Shutdown ||
                         e.SocketErrorCode == SocketError.ConnectionReset )
                     {
                         // Shutting down.
@@ -179,7 +173,7 @@ namespace TestProtocol
                     byte[] dataCopy = new byte[messageLength];
                     Array.Copy( readBuffer, 0, dataCopy, 0, messageLength );
                     Message message = new Message( operation, dataCopy );
-                 
+
                     try
                     {
                         this.Received( message );
@@ -187,8 +181,7 @@ namespace TestProtocol
                     catch( Exception e )
                     { }
                 }
-                
             }
         }
     }
-}
+}

TestProtocol/CustomServer.cs

@@ -159,7 +159,7 @@ namespace TestProtocol
 
                     operation = (ProtocolOp)ByteWriter.ReadInt32_BE( readBuffer, 0 );
 
-                    // Read the length 
+                    // Read the length
                     this.readSocket.Receive( readBuffer, 4, SocketFlags.None );
                     messageLength = ByteWriter.ReadInt32_BE( readBuffer, 0 );
 
@@ -212,7 +212,6 @@ namespace TestProtocol
                     catch( Exception )
                     { }
                 }
-
             }
 
             try
@@ -225,5 +224,4 @@ namespace TestProtocol
             catch { }
         }
     }
-
-}
+}

TestProtocol/Message.cs

@@ -1,14 +1,10 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace TestProtocol
 {
     public class Message
     {
-        public Message(ProtocolOp op, byte[] data)
+        public Message( ProtocolOp op, byte[] data )
         {
             this.Operation = op;
             this.Data = data;
@@ -18,4 +14,4 @@ namespace TestProtocol
 
         public byte[] Data { get; private set; }
     }
-}
+}

TestProtocol/Properties/AssemblyInfo.cs

@@ -1,8 +1,7 @@
 using System.Reflection;
-using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 
-// General Information about an assembly is controlled through the following 
+// General Information about an assembly is controlled through the following
 // set of attributes. Change these attribute values to modify the information
 // associated with an assembly.
 [assembly: AssemblyTitle( "TestProtocol" )]
@@ -14,8 +13,8 @@ using System.Runtime.InteropServices;
 [assembly: AssemblyTrademark( "" )]
 [assembly: AssemblyCulture( "" )]
 
-// Setting ComVisible to false makes the types in this assembly not visible 
-// to COM components.  If you need to access a type in this assembly from 
+// Setting ComVisible to false makes the types in this assembly not visible
+// to COM components.  If you need to access a type in this assembly from
 // COM, set the ComVisible attribute to true on that type.
 [assembly: ComVisible( false )]
 
@@ -25,12 +24,12 @@ using System.Runtime.InteropServices;
 // Version information for an assembly consists of the following four values:
 //
 //      Major Version
-//      Minor Version 
+//      Minor Version
 //      Build Number
 //      Revision
 //
-// You can specify all the values or you can default the Build and Revision Numbers 
+// You can specify all the values or you can default the Build and Revision Numbers
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
 [assembly: AssemblyVersion( "1.0.0.0" )]
-[assembly: AssemblyFileVersion( "1.0.0.0" )]
+[assembly: AssemblyFileVersion( "1.0.0.0" )]

TestProtocol/ProtocolOp.cs

@@ -1,8 +1,4 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace TestProtocol
 {
@@ -14,4 +10,4 @@ namespace TestProtocol
         EncryptedMessage = 3,
         SignedMessage = 4,
     }
-}
+}

TestServer/.gitignore

@@ -0,0 +1,2 @@
+bin
+obj

TestServer/App.config

@@ -1,6 +1,6 @@
 <?xml version="1.0"?>
 <configuration>
-    <startup> 
-        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>
-    </startup>
-</configuration>
+  <startup>
+    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0" />
+  </startup>
+</configuration>

TestServer/Program.cs

@@ -1,22 +1,19 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
 using System.Windows.Forms;
 
 namespace TestServer
 {
-    static class Program
+    internal static class Program
     {
         /// <summary>
         /// The main entry point for the application.
         /// </summary>
         [STAThread]
-        static void Main()
+        private static void Main()
         {
             Application.EnableVisualStyles();
             Application.SetCompatibleTextRenderingDefault( false );
             Application.Run( new ServerForm() );
         }
     }
-}
+}

TestServer/Properties/AssemblyInfo.cs

@@ -1,8 +1,7 @@
 using System.Reflection;
-using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 
-// General Information about an assembly is controlled through the following 
+// General Information about an assembly is controlled through the following
 // set of attributes. Change these attribute values to modify the information
 // associated with an assembly.
 [assembly: AssemblyTitle( "TestServer" )]
@@ -14,8 +13,8 @@ using System.Runtime.InteropServices;
 [assembly: AssemblyTrademark( "" )]
 [assembly: AssemblyCulture( "" )]
 
-// Setting ComVisible to false makes the types in this assembly not visible 
-// to COM components.  If you need to access a type in this assembly from 
+// Setting ComVisible to false makes the types in this assembly not visible
+// to COM components.  If you need to access a type in this assembly from
 // COM, set the ComVisible attribute to true on that type.
 [assembly: ComVisible( false )]
 
@@ -25,12 +24,12 @@ using System.Runtime.InteropServices;
 // Version information for an assembly consists of the following four values:
 //
 //      Major Version
-//      Minor Version 
+//      Minor Version
 //      Build Number
 //      Revision
 //
-// You can specify all the values or you can default the Build and Revision Numbers 
+// You can specify all the values or you can default the Build and Revision Numbers
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
 [assembly: AssemblyVersion( "1.0.0.0" )]
-[assembly: AssemblyFileVersion( "1.0.0.0" )]
+[assembly: AssemblyFileVersion( "1.0.0.0" )]

TestServer/ServerForm.cs

@@ -1,11 +1,5 @@
 using System;
-using System.Collections.Generic;
-using System.ComponentModel;
-using System.Data;
-using System.Drawing;
-using System.Linq;
 using System.Text;
-using System.Threading.Tasks;
 using System.Windows.Forms;
 using TestProtocol;
 
@@ -19,7 +13,7 @@ namespace TestServer
 
     public partial class ServerForm : Form
     {
-        private ServerCredential serverCred;
+        private ServerCurrentCredential serverCred;
 
         private ServerContext serverContext;
 
@@ -35,15 +29,15 @@ namespace TestServer
         {
             InitializeComponent();
 
-            this.serverCred = new ServerCredential( PackageNames.Negotiate );
+            this.serverCred = new ServerCurrentCredential( PackageNames.Negotiate );
 
-            this.serverContext = new ServerContext( 
+            this.serverContext = new ServerContext(
                 serverCred,
-                ContextAttrib.AcceptIntegrity | 
-                ContextAttrib.ReplayDetect | 
-                ContextAttrib.SequenceDetect | 
-                ContextAttrib.MutualAuth | 
-                ContextAttrib.Delegate | 
+                ContextAttrib.AcceptIntegrity |
+                ContextAttrib.ReplayDetect |
+                ContextAttrib.SequenceDetect |
+                ContextAttrib.MutualAuth |
+                ContextAttrib.Delegate |
                 ContextAttrib.Confidentiality
             );
 
@@ -129,11 +123,11 @@ namespace TestServer
             {
                 MessageBox.Show( "Starting impersonation: " + Environment.UserName );
 
-                FileStream stream = File.Create( Environment.GetFolderPath( Environment.SpecialFolder.DesktopDirectory) + @"\test.txt" );
+                FileStream stream = File.Create( Environment.GetFolderPath( Environment.SpecialFolder.DesktopDirectory ) + @"\test.txt" );
                 StreamWriter writer = new StreamWriter( stream, Encoding.UTF8 );
 
                 writer.WriteLine( "Hello world." );
-                
+
                 writer.Close();
                 stream.Close();
             }
@@ -150,7 +144,6 @@ namespace TestServer
             this.signButton.Enabled = this.connected;
         }
 
-
         private void server_Received( Message message )
         {
             if( message.Operation == ProtocolOp.ClientToken )
@@ -177,7 +170,6 @@ namespace TestServer
             this.initializing = true;
             this.connected = false;
 
-
             this.serverContext.Dispose();
             this.serverContext = new ServerContext(
                 serverCred,
@@ -189,14 +181,13 @@ namespace TestServer
                 ContextAttrib.Confidentiality
             );
 
-            this.BeginInvoke( (Action)delegate() 
+            this.BeginInvoke( (Action)delegate ()
             {
                 UpdateButtons();
                 this.clientUsernameTextBox.Text = "";
-            });
+            } );
         }
 
-
         private void HandleInit( Message message )
         {
             byte[] nextToken;
@@ -218,8 +209,8 @@ namespace TestServer
                         this.initializing = false;
                         this.connected = true;
 
-                        this.Invoke( (Action)delegate() 
-                        { 
+                        this.Invoke( (Action)delegate ()
+                        {
                             UpdateButtons();
                             this.clientUsernameTextBox.Text = serverContext.ContextUserName;
                         } );
@@ -227,29 +218,28 @@ namespace TestServer
                 }
                 else
                 {
-                    this.Invoke( (Action)delegate() 
+                    this.Invoke( (Action)delegate ()
                     {
                         MessageBox.Show( "Failed to accept token from client. Sspi error code: " + status );
                     } );
                 }
-
             }
         }
 
         private void HandleEncrypted( Message message )
         {
-            this.Invoke( (Action)delegate()
+            this.Invoke( (Action)delegate ()
             {
                 byte[] plainText = this.serverContext.Decrypt( message.Data );
                 string text = Encoding.UTF8.GetString( plainText );
-                
+
                 this.receivedTextbox.Text += "Received encrypted message from client:\r\n" + text + "\r\n";
             } );
         }
 
         private void HandleSigned( Message message )
         {
-            this.Invoke( (Action)delegate()
+            this.Invoke( (Action)delegate ()
             {
                 byte[] plainText;
 
@@ -268,11 +258,10 @@ namespace TestServer
 
         private void HandleUnknown( Message message )
         {
-            this.Invoke( (Action)delegate()
+            this.Invoke( (Action)delegate ()
             {
                 MessageBox.Show( "Received unexpected message from server. Message type: " + message.Operation );
             } );
         }
-
     }
-}
+}

readme.md

@@ -0,0 +1,61 @@
+## Downloads ##
+
+The latest release of NSspi is v0.2.0. 
+
+Version 0.2.0 adds the ability to authenticate using provided username/password credentials.  
+**Please note** that v0.2.0 introduces a small change in the design that breaks backwards compatibility with previous verisons.
+
+* [Source](https://github.com/antiduh/nsspi/archive/0.2.0.zip)
+* [Binaries](https://github.com/antiduh/nsspi/releases/download/0.1.3/nsspi-0.2.0-bin.zip)
+* [Nuget package](https://www.nuget.org/packages/NSspi)
+
+You can also browse the list of [releases](https://github.com/antiduh/nsspi/releases).
+
+
+
+## Introduction ##
+This projects provides a C# / .Net interface to the Windows Integrated Authentication API, better known as SSPI (Security Service Provider Interface). This allows a custom client / server system to authenticate users using their existing logon credentials. This allows a developer to provide Single-Sign-On in their application.
+
+## Overview ##
+The API provides raw access to authentication tokens so that authentication can be easily integrated into any networking system - you can send the tokens over a socket, a remoting interface, or heck even a serial port if you want; they're just bytes. Clients and servers may exchange encrypted and signed messages, and the server can perform client impersonation.
+
+The project is provided as a .Net 4.0 assembly, but can just as easily be upgraded to .Net 4.5 or later. The solution file can be opened by Visual Studio 2010 SP1, Visual Studio 2012, or later Visual Studio editions.
+
+The SSPI API provides an interface for real authentication protocols, such as Kerberos or NTLM, to be invoked transparently by client and server code in order to perform authentication and message manipulation. These authentication protocols are better known as 'security packages'.
+
+The SSPI API exposes these packages using a common API, and so a program may invoke one or the other with only minor changes in implementation. SSPI also supports the 'negotiate' 'meta' package, that allows a client and server to decide dynamically which real security provider to use, and then itself provides a passthrough interface to the real package.
+
+## Usage ##
+
+Typically, a client acquires some form of a credential, either from the currently logged on user's security context, by acquiring a username and password from the user, or by some other means. The server acquires a credential in a similar manner. Each uses their credentials to identify themselves to each other.
+
+A client and a server each start with uninitialized security contexts. They exchange negotiation and authentication tokens to perform authentication, and if all succeeds, they create a shared security context in the form of a client's context and a server's context. The effectively shared context agrees on the security package to use (kerberos, NTLM), and what parameters to use for message passing. Every new client that authenticates with a server creates a new security context specific to that client-server pairing.
+
+From the software perspective, a client security context initializes itself by exchanging authentication tokens with a server; the server initializes itself by exchanging authentication tokens with the client.
+
+This API provides raw access to the authentication tokens created during the negotiation and authentication process. In this manner, any application can integrate SSPI-based authentication by deciding for themselves how to integrate the tokens into their application protocol.
+
+The project is broken up into 3 chunks:
+
+ * The NSspi library, which provides safe, managed access to the SSPI API.
+ * NsspiDemo, a quick demo program to show how to exercise the features of NSspi locally.
+ * UI demo programs TestClient and TestServer (that have a common dependency on TestProtocol) that
+   may be run on separate machines, that show how one might integrate SSPI into a custom 
+   application.
+
+## More information ##
+
+If you would like to understand the SSPI API, feel free to browse the following references:
+
+MSDN documentation on the SSPI API:<br/>
+&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; [http://msdn.microsoft.com/en-us/library/windows/desktop/aa374731(v=vs.85).aspx](http://msdn.microsoft.com/en-us/library/windows/desktop/aa374731\(v=vs.85\).aspx)
+
+MSDN article on SSPI along with a sample Managed C++ SSPI library and UI client/servers.<br/>
+&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; [http://msdn.microsoft.com/en-us/library/ms973911.aspx](http://msdn.microsoft.com/en-us/library/ms973911.aspx)
+
+Relevant StackOverflow questions:
+
+* [Client-server authentication - using SSPI?](http://stackoverflow.com/questions/17241365/)
+* [Validate Windows Identity Token](http://stackoverflow.com/questions/11238141/)
+* [How to deal with allocations in constrained execution regions?](http://stackoverflow.com/questions/24442209/)
+* [AcquireCredentialsHandle returns massive expiration time](http://stackoverflow.com/questions/24478056/)