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* Slight overhaul of arc4random() and friends.Poul-Henning Kamp2002-10-111-22/+27
| | | | | | | | | | | | | | | | | | | | | | One bug fixed: Use getmicrouptime() to trigger reseeds so that we cannot be tricked by a clock being stepped backwards. Express parameters in natural units and with natural names. Don't use struct timeval more than we need to. Various stylistic and readability polishing. Introduce arc4rand(void *ptr, u_int len, int reseed) function which returns a stream of pseudo-random bytes, observing the automatic reseed criteria as well as allowing forced reseeds. Rewrite arc4random() in terms of arc4rand(). Sponsored by: DARPA & NAI Labs. Notes: svn path=/head/; revision=104900
* Fixed some typos, verboseness and misformatting in comments.Bruce Evans2001-08-301-10/+8
| | | | Notes: svn path=/head/; revision=82565
* Minor improvements to arc4random():Mike Silbersack2001-08-301-4/+29
| | | | | | | | | | | | | | - Decrease reseeding interval from every 64 to every 16384 runs to reduce entropy usage. - Add time based reseeding. (Every 5 minutes.) - Throw away the first 256 words of output as suggested in "Weaknesses in the Key Scheduling Algorithm of RC4." Reviewed by: Mark Murray MFC After: jkh says ok Notes: svn path=/head/; revision=82543
* Recouple arc4random(9) to the entropy device. This works whether theMark Murray2000-12-021-2/+4
| | | | | | | | | | entropy device is loaded or not. If the entropy device is NOT loaded, the the quality of perturbations supplied by this will suffer. Notes: svn path=/head/; revision=69520
* Back out previous revision now that sys/random.h is properly fixed.John Baldwin2000-09-111-2/+0
| | | | Notes: svn path=/head/; revision=65754
* Add #include's of sys/proc.h and sys/param.h to silence a warning.John Baldwin2000-09-111-0/+2
| | | | Notes: svn path=/head/; revision=65724
* Comment out unavailable call. This needs to be revisited when the entropyMark Murray2000-06-251-3/+4
| | | | | | | | device is complete. Reviewed by: dfr Notes: svn path=/head/; revision=62072
* In the extremely miniscule chance that read_random returns <= 0, don't tryDan Moschuk1999-11-291-2/+6
| | | | | | | and use that return code as a modulus (panics are bad, mmmkay?) Notes: svn path=/head/; revision=53893
* Address the concerns of the ``randomness'' of the initial PRNG. Now, weDan Moschuk1999-11-281-14/+32
| | | | | | | | | | use bits from /dev/random to stir the S-box. Also add an internal counter to keep the S-box stirred on a regular basis. Reviewed by: msmith Notes: svn path=/head/; revision=53864
* Introduce OpenBSD-like Random PIDs. Controlled by a sysctl knobDan Moschuk1999-11-281-0/+89
(kern.randompid), which is currently defaulted off. Use ARC4 (RC4) for our random number generation, which will not get me executed for violating crypto laws; a Good Thing(tm). Reviewed and Approved by: bde, imp Notes: svn path=/head/; revision=53842
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