75  * entropy into a subset of pools per iteration with the goal of feeding
107  * Allow the sysadmin to select the broad category of entropy types to harvest.
122     "Entropy Device Parameters");
135 	/* The context of the kernel thread processing harvested entropy */
153 					    "entropy harvest mutex", NULL, MTX_SPIN)
203 		/* XXX: FIX!! This is a *great* place to pass hardware/live entropy to random(9) */  in random_kthread()
226  * Run through all fast sources reading entropy for the given
228  * of entropy accumulation pools in use; it is 32 for Fortuna.
233 	uint32_t entropy[HARVESTSIZE];  in random_sources_feed()  local
255 	 * all of the PRNG's pools with entropy; if there is enough entropy  in random_sources_feed()
256 	 * available from "fast" entropy sources this will allow us to finish  in random_sources_feed()
259 	 * small chunk of entropy every 1 / RANDOM_KTHREAD_HZ seconds.  in random_sources_feed()
263 	 * PRNG or smaller pools for Fortuna, we might collect more entropy  in random_sources_feed()
265 	 * a different PRNG, larger pools, or fast entropy sources which are  in random_sources_feed()
266 	 * not able to provide as much entropy as we request may result in the  in random_sources_feed()
269 	 * try again for a large amount of entropy.  in random_sources_feed()
273 		    RANDOM_FORTUNA_DEFPOOLSIZE, sizeof(entropy));  in random_sources_feed()
276 	 * Step over all of live entropy sources, and feed their output  in random_sources_feed()
284 				/* Source pushes entropy asynchronously. */  in random_sources_feed()
287 			n = rrs->rrs_source->rs_read(entropy, sizeof(entropy));  in random_sources_feed()
288 			KASSERT((n <= sizeof(entropy)),  in random_sources_feed()
290 			    __func__, n, sizeof(entropy)));  in random_sources_feed()
293 			 * Sometimes the HW entropy source doesn't have anything  in random_sources_feed()
295 			 * We don't perform any other verification of an entropy  in random_sources_feed()
297 			 * to sizeof(entropy), quality is unchecked, etc), so  in random_sources_feed()
301 			 * But it's still a better entropy source than RDRAND.  in random_sources_feed()
305 			random_harvest_direct(entropy, n, rrs->rrs_source->rs_source);  in random_sources_feed()
310 	explicit_bzero(entropy, sizeof(entropy));  in random_sources_feed()
314  * State used for conducting NIST SP 800-90B health tests on entropy sources.
348 		 * For pure entropy sources the timestamp counter is generally  in copy_event()
350 		 * intervals, so does not contribute much to the entropy.  To  in copy_event()
508 	 * Set cutoff values for the two tests, given a min-entropy estimate for  in random_healthtest_init()
510 	 * min-entropy estimate of 1 bit and a sample rate of RANDOM_KTHREAD_HZ,  in random_healthtest_init()
548 		 * For environmental sources, the main source of entropy is the  in random_healthtest_init()
551 		 * min-entropy estimate of 1 bit per sample.  For "pure"  in random_healthtest_init()
609 	 * Disallow userspace modification of pure entropy sources.  in random_check_uint_harvestmask()
620     "Entropy harvesting mask");
648     "Entropy harvesting mask (printable)");
718     "Entropy harvesting mask (symbolic)");
737  * Subroutine to slice up a contiguous chunk of 'entropy' and feed it into the
742 random_early_prime(char *entropy, size_t len)  in random_early_prime()  argument
757 		memcpy(event.he_entropy, entropy + i, sizeof(event.he_entropy));  in random_early_prime()
760 	explicit_bzero(entropy, len);  in random_early_prime()
798 	 * Get entropy that may have been preloaded by loader(8)  in random_harvestq_prime()
799 	 * and use it to pre-charge the entropy harvest queue.  in random_harvestq_prime()
807 			printf("random: no preloaded entropy cache\n");  in random_harvestq_prime()
815 			printf("random: no platform bootloader entropy\n");  in random_harvestq_prime()
832  * Entropy harvesting queue routine.
846 random_harvest_queue_(const void *entropy, u_int size, enum random_entropy_source origin)  in random_harvest_queue_()  argument
865 			memcpy(event->he_entropy, entropy, size);  in random_harvest_queue_()
869 			event->he_entropy[0] = jenkins_hash(entropy, size, (uint32_t)(uintptr_t)event);  in random_harvest_queue_()
876  * Entropy harvesting fast routine.
882 random_harvest_fast_(const void *entropy, u_int size)  in random_harvest_fast_()  argument
888 	    jenkins_hash(entropy, size, random_get_cyclecount());  in random_harvest_fast_()
893  * Entropy harvesting direct routine.
896  * (e.g.) booting when initial entropy is being gathered.
899 random_harvest_direct_(const void *entropy, u_int size, enum random_entropy_source origin)  in random_harvest_direct_()  argument
909 	memcpy(event.he_entropy, entropy, size);  in random_harvest_direct_()
981 	    "List of active fast entropy sources.");