Windows: how to get high resolution time in PRNG

Greg Hudson ghudson at MIT.EDU
Tue Aug 9 16:46:38 EDT 2011

Oh, and I'll note that Heimdal's libroken has a gettimeofday()
implementation for Windows which appears to have better precision than
ours; I would suggest using that code in the libkrb5support function.

(On a complete tangent, lib/hcrypto/rand-w32.c may provide clues as to
how to get k5_get_os_entropy to work on XP.)

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