Tom Lane <t...@sss.pgh.pa.us> writes: > David CARLIER <devne...@gmail.com> writes: >> I m not against as such that depends of the implementation but I ve seen in >> quick glance it s RC4 ?
arc4random uses ChaCha20 since OpenBSD 5.5 (and libbsd 0.8.0 on Linux). It uses getentropy(2) to seed itself at regular intervals and at fork(). http://man.openbsd.org/arc4random.3 > More generally, why should we bother with an additional implementation? > Is this better than /dev/urandom, and if so why? If what is wanted is something more like /dev/urandom, one can call getentropy(2) (or on Linux, getrandom(2)) directly, which avoids having to open the device file each time. http://man.openbsd.org/getentropy.2 https://manpages.debian.org/stretch/manpages-dev/getrandom.2.en.html - ilmari -- "The surreality of the universe tends towards a maximum" -- Skud's Law "Never formulate a law or axiom that you're not prepared to live with the consequences of." -- Skud's Meta-Law
