Stas Bekman wrote:
Stas Bekman wrote:
in one window start:
cat /dev/random
in the other:
perl -le 'system ("cat /proc/sys/kernel/random/entropy_avail"), sleep 1 while 1'
3712
0
0
688
and if in the third window I try to feed /dev/random while doing the above:
perl -le 'system ("echo stas >> /dev/random") while 1'
it makes no difference at all. no entropy is added. On the other hand /dev/urandom seems to be always full.
Yes, that's documented behaviour, at least for urandom. urandom is a very pseudo random source and it will never block
/dev/random on the other hand, is supposed to come with entropy guarantees and can block when it runs out of it. BUT, I believe that writing to /dev/random is supposed to add to the entropy pool.
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