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Helper methods to safely invoke the VerifySignature and MakeSignature native methods.

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This commit is contained in:
antiduh
2014-06-27 01:52:42 +00:00
parent 4224193f6f
commit ffb7e36edb
2 changed files with 96 additions and 62 deletions
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84
Contexts/ContextNativeMethods.cs
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@@ -257,5 +257,89 @@ namespace NSspi.Contexts
return status;
}
internal static SecurityStatus SafeMakeSignature(
SafeContextHandle handle,
int qualityOfProtection,
SecureBufferAdapter adapter,
int sequenceNumber )
{
bool gotRef = false;
SecurityStatus status = SecurityStatus.InternalError;
RuntimeHelpers.PrepareConstrainedRegions();
try
{
handle.DangerousAddRef( ref gotRef );
}
catch ( Exception )
{
if ( gotRef )
{
handle.DangerousRelease();
gotRef = false;
}
throw;
}
finally
{
if ( gotRef )
{
status = ContextNativeMethods.MakeSignature(
ref handle.rawHandle,
0,
adapter.Handle,
0
);
handle.DangerousRelease();
}
}
return status;
}
internal static SecurityStatus SafeVerifySignature(
SafeContextHandle handle,
int qualityOfProtection,
SecureBufferAdapter adapter,
int sequenceNumber )
{
bool gotRef = false;
SecurityStatus status = SecurityStatus.InternalError;
RuntimeHelpers.PrepareConstrainedRegions();
try
{
handle.DangerousAddRef( ref gotRef );
}
catch ( Exception )
{
if ( gotRef )
{
handle.DangerousRelease();
gotRef = false;
}
throw;
}
finally
{
if ( gotRef )
{
status = ContextNativeMethods.VerifySignature(
ref handle.rawHandle,
adapter.Handle,
0,
0
);
handle.DangerousRelease();
}
}
return status;
}
}
}