tfm.h contains declarations for the public part of the library.
tfm_private.h contains the function which are private to tfm and should
not be exposed to the public.
Signed-off-by: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
When we ask to generate a prime whose size is a multiple of 8,
the code wrongly computes the mask as 0x00 instead of 0xFF, so the
generated prime always has the MSB set to 0x80 (the highest bit is OR'ed
later in the code).
