Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

RFC 2289 requires all hashes be stored in little endian format before
folding to 64 bits, while SHA1 code is big endian. Therefore, a bswap32
is required before using the value.

Without this change, the implementation does not conform to test vector
found in RFC 2289.

PR: bin/170519
Submitted by: Arthur Mesh <arthurmesh gmail com> (with changes)
MFC after: 1 week

Resolve conflicts.

Fix SHA1 hashing.

Resolve conflicts

Merge

Disconnect OPIE from internal MD4/5 routines

This commit was generated by cvs2svn to compensate for changes in r22347,
which included commits to RCS files with non-trunk default branches.

Initial import of OPIE v2.3 from
ftp://ftp.nrl.navy.mil/pub/security/opie/