On Aug 24, 2015, at 11:33 AM, David Luengo López <[email protected]> wrote:
> 439 #define DUMMY_SEED "...................." /* at least MD_DIGEST_LENGTH */
> 440 /* Note that the seed does not matter, it's just that
> 441 * ssleay_rand_add expects to have something to hash. */
> 442 ssleay_rand_add(DUMMY_SEED, MD_DIGEST_LENGTH, 0.0);
>
> I don't know why the 0.0 parameter, since we are not adding anything here I
> never get more entropy in the pool. Any explanation for this 0.0?
Because there is actually no entropy in DUMMY_SEED --- it's a constant. This
piece of code is "stirring" the pool; it doesn't increase the amount of entropy
(unpredictability) in the pool, it just makes sure that all the bits of the
pool are equally unpredictable. Actual entropy must be added by some other
piece of code.
> Anyone knows what does OPENSSL_SYS_VOS macro means?
The notes from the patch from Paul Green adding randomness support for VOS
might have useful information for you:
https://rt.openssl.org/Ticket/Display.html?id=2563&user=guest&pass=guest
(I do not know enough about VxWorks or VOS to say whether defining
OPENSSL_SYS_VOS safely solves your problem, though it seems plausible)
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