convert bcopy to memcpy in md5 and sha1. also be consistent about clearing
context and making digest required to Final.

Defining the interface in terms of char * means most callers are
required to cast their pointers, which is ugly and possibly error
prone. accidentally casting an int to a pointer, for example, instead
of the address of the int. implicit void * casting is safer.

This updates the kernel hash interfaces to use void *. Similar changes
are possible for userland. I think it's safe, but there may be some
peculiar source compatbility issues there, so let's just do the kernel
first.
ok dlg millert

in SHA1Final(), explicitly clear the local buffer
ok mikeb

Make the hmac ipad/opad globals "const" and fixup the crypto functions
to match.

ok deraadt@

unbreak landisk kernel sha1 by working around a compiler bug;
also brings kernel sha1 more in line with userland;
discussed with miod@ and millert@;

``it's'' -> ``its'' when the grammar gods require this change.

Some KNF, made bit count u_int64_t instead of u_int32_t (similar to libc).
Added constants for buffer lengths.

ok millert@

remove sparc64/gcc2 workaround.

ok millert@ deraadt@ jason@

Move the rounds into separate functions on sparc64 so gcc's optimizer
doesn't blow up. This is a hack but is better than compiling sha1.c
with -O0 on sparc64. From NetBSD (mrg).
deraadt@ OK

branches: 1.2.8;
better indent for easier searching

branches: 1.1.2;
move crypto code