/// <summary>
/// Queries the security package's expections regarding message/token/signature/padding buffer sizes.
/// </summary>
/// <returns></returns>
private SecPkgContext_Sizes QueryBufferSizes()
{
SecPkgContext_Sizes sizes = new SecPkgContext_Sizes();
SecurityStatus status = SecurityStatus.InternalError;
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.QueryContextAttributes_Sizes(
ref this.ContextHandle.rawHandle,
ContextQueryAttrib.Sizes,
ref sizes
);
this.ContextHandle.DangerousRelease();
}
}
if (status != SecurityStatus.OK)
{
SSPIException exc = new SSPIException("Failed to query context buffer size attributes", status);
throw new SecurityException(ErrorHandling.ErrorCodes.Security.SSPI_ERROR, new string[] { exc.Message });
}
return(sizes);
}
internal static extern SecurityStatus QueryContextAttributes_Sizes(
ref RawSspiHandle contextHandle,
ContextQueryAttrib attrib,
ref SecPkgContext_Sizes sizes
);
