[Nicolas Williams <Nicolas.Williams@sun.com>] client-side pre-auth re-architecting

[Sam Hartman]

Note that we mostly consider keyblocks immutable in new code and so
you probably want a keyblock ** or something.


Actually we don't so much consider them immutable, but we you should
use the initializor and destructor provided by the crypto library
rather than calling malloc or free or realloc directly for the
contents.