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When testcrypt.h lists a function argument as 'opt_val_foo', it means that the argument is optional in the sense that the C function can take a null pointer in place of a valid foo, and so the Python wrapper module should accept None in the corresponding argument slot from the client code and translate it into the special string "NULL" in the wire protocol. This works fine at argument translation time, but the code that reads testcrypt.h wasn't looking at it, so if you said 'opt_val_foo_suffix' in place of 'opt_val_foo' (indicating that that argument is optional _and_ the C function expects it in a translated form), then the initial pass over testcrypt.h wouldn't strip the _suffix, and would set up data structures with mismatched type names.