Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

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

Revert 239931 and 239932 until I figure out why it breaks on stable branches
but not on -HEAD.

Noticed by: tinderbox
Pointy hat to: delphij

MFC r238964:

Teach md5(1) about sha512.

MFC r235211:

General mdoc(7) and typo fixes.

PR: 167696

MFC r227491:

- new sentence should start on new line.

Approved by: gjb

MFC r227488:

- add "check" option to MD5 and friends to compare files against known hash.

Approved by: cperciva

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Minor markup fix for the r186836 update.

Strengthen some of the language concerning attacks on MD5, in light of the
recent demonstration of a forged SSL certificate. Add text pointing out
that SHA-1 is at least theoretically broken. Add a recommendation that
new applications use SHA-256.

MFC after: 1 month

Bring a paragraph in this manual page a bit closer to the present date.

Discussed with: des

Belatedly update the md5(1) man page to reflect the addition of sha256.

Added the EXIT STATUS section where appropriate.

mdoc(7) fixes.

Add sha1 and rmd160 checksum tools.

Since the algorithms are already supported in libmd,
the size increase is small when a dynamic root is used.

Approved by: joerg, ru
MFC after: 2 weeks

Assorted markup, grammar, and spelling fixes.

Set exit code to 1 in case at least one of the input files
could not be opened.

Use `The .Nm utility'

mdoc(7) police: removed hard sentence breaks.

Mention collision attacks on MD5. From the md5(3) man page.

PR: docs/14158
Reviewed by: kris
Submitted by: Eric Frias <efrias@sg505.net>

mdoc(7) police:

Avoid using parenthesis enclosure macros (.Pq and .Po/.Pc) with plain text.
Not only this slows down the mdoc(7) processing significantly, but it also
has an undesired (in this case) effect of disabling hyphenation within the
entire enclosed block.

Remove whitespace at EOL.

This command has more than four options.

mdoc(7) police: use the default ``file ...'' feature of the .Ar macro.

mdoc(7) police: use the new features of the Nm macro.

Add -q quite mode.

Make `-r -s' also match the BSDI output.

Add a new "-r" (right) option that reverses the order a filename and the
hash is printed. This aids visual diffs.

Correct use of .Nm. Spelling. Add rcsid, remove unused #includes, use err(3).

Get md5(1) to use getopt(3). Also some minor -Wall cleaning
while here.

PR: 5387
Submitted by: Matthew Hunt <mph@pobox.com>

fix a few spelling changes

Submitted by: Josh Gilliam

Closes PR's: 4429, 4431-4438

PS: He has agreed to submit all contrib fixes back to the original author.

mdoc'ify man page

Add a '-p' option to md5. This will save some time in generation of the
ctm deltas.

Changed a sum(1) to a cksum(1).

This commit was generated by cvs2svn to compensate for changes in r3995,
which included commits to RCS files with non-trunk default branches.

Incorproate version of md5 placed into public domain by RSA.