is no function called md5()
as discussed with jmc

a long sentence (from tj@).

or otherwise change Dt to reflect the name of an existing function;
feedback/ok schwarze

troff displays these as typographic quotes, but nroff implementations
almost always print them literally, which rarely has the intended effect
with modern fonts, even in stock xterm.
These uses of `` '' can be replaced either with more semantic alternatives
or with Dq, which prints typographic quotes in a UTF-8 locale (but will
automatically fall back to `` '' in an ASCII locale).
improvements and ok schwarze@

this license change. We will remember that we all still like beer.

"A collision attack published in 2007 can find collisions for full
MD4 in less than two hash operations."
ok deraadt@, man pages ok jmc@

references into a STANDARDS section;

variants) for URLs, allowing mandoc -Thtml to properly generate links;
(sendmail.8 changes are simply using Lk, which i somehow missed in previous)
ingo reminded me to verify that gnu groff recognises %U: 1.20.1 does not,
but 1.21 does;

ok deraadt jmc millert sobrado

ok pedro@, millert@

The Pad function does padding like in Final but does not finish processing.
The FileChunk function creates a digest from a portion of a file.
Also made the length parameters consistent (and size_t).

functions can take a NULL buf pointer.  They will malloc memory as
needed in this case.