David McCullough wrote:
Jivin Jeff Garzik lays it down ...
On Thu, Mar 24, 2005 at 02:27:08PM +1000, David McCullough wrote:
Hi all,
Here is a small patch for 2.6.11 that adds a routine:
add_true_randomness(__u32 *buf, int nwords);
so that true random number generator device drivers can add a entropy
to the system. Drivers that use this can be found in the latest release
of ocf-linux, an asynchronous crypto implementation for linux based on
the *BSD Cryptographic Framework.
http://ocf-linux.sourceforge.net/
Adding this can dramatically improve the performance of /dev/random on
small embedded systems which do not generate much entropy.
We've already had hardware RNG support for a while now.
No kernel patching needed.
Are you talking about /dev/hw_random ? If not then sorry I didn't see it :-(
On a lot of the small systems I work on, /dev/random is completely
unresponsive, and all the apps use /dev/random, not /dev/hw_random.
Would you suggest making /dev/random point to /dev/hw_random then ?
All the apps are supposed to use /dev/random, so that's correct.
For Hardware RNGs, userspace rngd daemon obtains entropy, checks it
(mainly checking for hardware failures), and then stuffs entropy into
the kernel random device. http://sf.net/projects/gkernel/
On the "to do" list is making rngd directly generate entropy use
'xstore' on VIA CPUs, rather than going kernel -> userland -> kernel.
Also, there are other entropy daemons floating about. I think there is
one that obtains noise from an audio device.
Jeff
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