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Implemented CERs for encryption and decryption.

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This commit is contained in:
antiduh
2014-06-24 22:51:38 +00:00
parent bf1312cb81
commit 8837f3e95c
2 changed files with 69 additions and 18 deletions
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83
Contexts/Context.cs
View File

@@ -5,6 +5,7 @@ using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;
namespace NSspi
{
@@ -89,7 +90,7 @@ namespace NSspi
SecureBuffer paddingBuffer;
SecureBufferAdapter adapter;
SecurityStatus status;
SecurityStatus status = SecurityStatus.InvalidHandle;
byte[] result;
trailerBuffer = new SecureBuffer( new byte[sizes.SecurityTrailer], BufferType.Token );
@@ -100,13 +101,37 @@ namespace NSspi
using( adapter = new SecureBufferAdapter( new[] { trailerBuffer, dataBuffer, paddingBuffer } ) )
{
// TODO SAFE_CER
status = ContextNativeMethods.EncryptMessage(
ref this.ContextHandle.rawHandle,
0,
adapter.Handle,
0
);
bool gotRef = false;
RuntimeHelpers.PrepareConstrainedRegions();
try
{
this.ContextHandle.DangerousAddRef( ref gotRef );
}
catch( Exception )
{
if( gotRef )
{
this.ContextHandle.DangerousRelease();
gotRef = false;
}
throw;
}
finally
{
if( gotRef )
{
status = ContextNativeMethods.EncryptMessage(
ref this.ContextHandle.rawHandle,
0,
adapter.Handle,
0
);
this.ContextHandle.DangerousRelease();
}
}
}
if( status != SecurityStatus.OK )
@@ -152,8 +177,8 @@ namespace NSspi
SecureBuffer dataBuffer;
SecureBuffer paddingBuffer;
SecureBufferAdapter adapter;
SecurityStatus status;
SecurityStatus status = SecurityStatus.InvalidHandle;
byte[] result = null;
int remaining;
int position;
@@ -217,13 +242,37 @@ namespace NSspi
using( adapter = new SecureBufferAdapter( new [] { trailerBuffer, dataBuffer, paddingBuffer } ) )
{
// TODO SAFE_CER
status = ContextNativeMethods.DecryptMessage(
ref this.ContextHandle.rawHandle,
adapter.Handle,
0,
0
);
bool gotRef = false;
RuntimeHelpers.PrepareConstrainedRegions();
try
{
this.ContextHandle.DangerousAddRef( ref gotRef );
}
catch( Exception )
{
if( gotRef )
{
this.ContextHandle.DangerousRelease();
gotRef = false;
}
throw;
}
finally
{
if( gotRef )
{
status = ContextNativeMethods.DecryptMessage(
ref this.ContextHandle.rawHandle,
adapter.Handle,
0,
0
);
this.ContextHandle.DangerousRelease();
}
}
}
if( status != SecurityStatus.OK )

4
Contexts/ContextNativeMethods.cs
View File

@@ -1,6 +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;
@@ -105,6 +106,7 @@ namespace NSspi
public static extern SecurityStatus DeleteSecurityContext( ref RawSspiHandle contextHandle );
[ReliabilityContract(Consistency.WillNotCorruptState, Cer.MayFail )]
[DllImport( "Secur32.dll", EntryPoint = "EncryptMessage", CharSet = CharSet.Unicode )]
public static extern SecurityStatus EncryptMessage(
ref RawSspiHandle contextHandle,
@@ -113,7 +115,7 @@ namespace NSspi
int sequenceNumber
);
[ReliabilityContract( Consistency.WillNotCorruptState, Cer.MayFail )]
[DllImport( "Secur32.dll", EntryPoint = "DecryptMessage", CharSet = CharSet.Unicode )]
public static extern SecurityStatus DecryptMessage(
ref RawSspiHandle contextHandle,