public SafeCspHandle Duplicate()
{
Contract.Requires(!IsInvalid && !IsClosed);
// In the window between the call to CryptContextAddRef and when the raw handle value is assigned
// into this safe handle, there's a second reference to the original safe handle that the CLR does
// not know about, so we need to bump the reference count around this entire operation to ensure
// that we don't have the original handle closed underneath us.
bool acquired = false;
RuntimeHelpers.PrepareConstrainedRegions();
try
{
DangerousAddRef(ref acquired);
IntPtr originalHandle = DangerousGetHandle();
int error = (int)CapiNative.ErrorCode.Success;
SafeCspHandle duplicate = new SafeCspHandle();
// A successful call to CryptContextAddRef and an assignment of the handle value to the duplicate
// SafeHandle need to happen atomically, so we contain them within a CER.
RuntimeHelpers.PrepareConstrainedRegions();
try { }
finally
{
if (!CryptContextAddRef(this, IntPtr.Zero, 0))
{
error = Marshal.GetLastWin32Error();
}
else
{
duplicate.SetHandle(originalHandle);
}
}
// If we could not call CryptContextAddRef succesfully, then throw the error here otherwise
// we should be in a valid state at this point.
if (error != (int)CapiNative.ErrorCode.Success)
{
duplicate.Dispose();
throw new CryptographicException(error);
}
else
{
Debug.Assert(!duplicate.IsInvalid, "Failed to duplicate handle successfully");
}
return(duplicate);
}
finally
{
if (acquired)
{
DangerousRelease();
}
}
}
public SafeCspHandle Duplicate()
{
SafeCspHandle handle2;
bool success = false;
RuntimeHelpers.PrepareConstrainedRegions();
try
{
base.DangerousAddRef(ref success);
IntPtr ptr = base.DangerousGetHandle();
int hr = 0;
SafeCspHandle handle = new SafeCspHandle();
RuntimeHelpers.PrepareConstrainedRegions();
try
{
}
finally
{
if (!CryptContextAddRef(this, IntPtr.Zero, 0))
{
hr = Marshal.GetLastWin32Error();
}
else
{
handle.SetHandle(ptr);
}
}
if (hr != 0)
{
handle.Dispose();
throw new CryptographicException(hr);
}
handle2 = handle;
}
finally
{
if (success)
{
base.DangerousRelease();
}
}
return handle2;
}
