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FUNC_WRAPPED is an alternative keyword to FUNC which you can use to introduce a function specification in testcrypt.h, indicating that the function is _not_ the one of the same name used in the main PuTTY code, but instead a wrapper on it in testcrypt.c whose API was reworked to be more friendly to translation into Python. There are a lot of those wrappers already, and previously they passed without comment in testcrypt.h, and were put into service by #defining over the top of each name before expanding the marshalling functions. Now, all those #defines are gone, because the use of FUNC_WRAPPED in testcrypt.h is enough to clue in the marshalling wrapper to be generated with a call to foo_wrapper() instead of foo(). Mostly the purpose of this is to make testcrypt.h a bit more self-documenting: if you see FUNC_WRAPPED, you know not to be confused by the Python and C function definitions totally failing to match.