Linux: Really using hardware random number generators.

Posted by coldtobi | 21 Oct, 2010, 23:16

A HW Random Number generator (HW RNG) helps programms a lot which needs some good entrophy, something especially on server systems is rare. Syntoms are slow key generation (ssl, ssh ... ) and poor performance when reading from /dev/random. 

However, soley having a HW RNG won't improve much -- this is what I learned today: I have a hifn 7955 based crypto accelerator in my NAS, but still poor /dev/random read rates. 

By coincident I learned that I looked at the wrong device -- the randoms by the hardware are available through /dev/hwrng. But how does other programms know that they should use this device instead of /dev/random? 

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