Protect against future mistakes with an assert().

Spotted by Harald Koch <chk@pobox.com>

(we don't have an ASN1_TEMPLATE to complain about at this stage,
so  errtt == NULL  should be OK)

(provided by Stephen)

just a slowdown.

performance to gain.

compiler bug reported in <01032110293775.22278@weba3.iname.net>
(the '++seq[i]' condition is evaluated as 256 rather than 0
when the previous value is 255).

without releasing a lock. This is the same fix as applied to
OpenSSL-engine-0_9_6-stable, minus the ENGINE_ctrl() change - the HEAD
already had that fixed.

lock - stupidly, my last change addressed only one of them.

combine in CHOICE options.

This was causing d2i_DSAPublicKey() to misbehave.

index -1).

FreeBSD's /bin/sh.

development line as well.

des_encrypt() and des_encrypt() defined on some systems (Solaris and
Unixware and maybe others), we rename des_encrypt() to des_encrypt1().
This should have very little impact on external software unless
someone has written a mode of DES, since that's all des_encrypt() is
meant for.