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authorGuilhem Moulin <guilhem@fripost.org>2014-01-23 02:18:40 +0100
committerGuilhem Moulin <guilhem@fripost.org>2015-06-07 04:27:57 +0200
commitba40cbca9650e1ddaa8357c21b5de31cc376c481 (patch)
tree292c6f88b870eee95d229c52a42b74655bc7ae2e /virtualenv
parentef60bfefc79b00a41ca3a8e9388d3cf3ff46068e (diff)
Ensure urandom entropy is of cryptographic quality.
The non-blocking PRNG /dev/urandom doesn't block if it has been seeded enough, sadly (e.g., if the entropy pool is empty). Reading a few bytes from the *blocking* should ensure that "the kernel RNG has [...] reach full entropy at least once, which guarantees cryptographic quality of the rest of the /dev/urandom stream." -- Tor bug #10676 https://trac.torproject.org/projects/tor/ticket/10676 See also urandom(4).
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