excessive SHA1 calls

[tridge at samba.org]

Love,

 > About 24000 sha1 calls seems to be in the right dimension for one s2k, but
 > that shouldn't account for all your time since that would be be around 0.4s
 > for my slow hotplate, eh, powerbook.

Is there any way to avoid this? Can we cache any of it?

0.4s per connection is a _lot_ to be paying. We've noticing it under
valgrind as that becomes a lot more under a synthetic CPU.

Cheers, Tridge