serpent, transform: rework GET_32BIT_MSB_FIRST, PUT_...
The macros GET_32BIT_MSB_FIRST and PUT_32BIT_MSB_FIRST duplicate
functionality available in unaligned.h, namely get_uint32 and
put_uint32. Replace all uses outside serpent.c with calls to
get_uint32 and put_uint32.
We are going to make our serpent implementation compile-time
bytesexual, so we do retain a separate implementation of this
functionality in a form which will make that easier. In particular,
they take arguments for the base and length of the array in
which 32-bit we are making the 32-bit access.
Also, this disentangles serpent.c from secnet.h. To make serpent.c
easier to reuse, remove the #include of secnet.h (and replace it with
stdint.h, which we do need and were getting via secnet.h).
No functional change.
Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
~mdw / secnet / commit