Cross Reference: /bind-9.11.3/lib/isc/entropy.c

Lines Matching defs:entropy
9 /* $Id: entropy.c,v 1.22 2010/08/10 23:48:19 tbox Exp $ */
13  * This is the system independent part of the entropy module.  It is
15  * \link unix/entropy.c unix/entropy.c \endlink or win32/entropy.c.
26 #include <isc/entropy.h>
58  * Size of entropy pool in 32-bit words.  This _MUST_ be a power of 2.
90 	isc_uint32_t	entropy;	/*%< current entropy estimate in bits */
140 	isc_uint32_t	total;		/*%< entropy from this source */
219  * Add in entropy, even when the value we're adding in could be
223 add_entropy(isc_entropy_t *ent, isc_uint32_t entropy) {
225 	entropy = ISC_MIN(entropy, RND_POOLBITS);
226 	/* Add in the entropy we already have. */
227 	entropy += ent->pool.entropy;
229 	ent->pool.entropy = ISC_MIN(entropy, RND_POOLBITS);
233  * Decrement the amount of entropy the pool has.
236 subtract_entropy(isc_entropy_t *ent, isc_uint32_t entropy) {
237 	entropy = ISC_MIN(entropy, ent->pool.entropy);
238 	ent->pool.entropy -= entropy;
242  * Add in entropy, even when the value we're adding in could be
305  * Requires that the lock is held on the entropy pool.
309 		    isc_uint32_t entropy)
365 	add_entropy(ent, entropy);
366 	subtract_pseudo(ent, entropy);
429 	 * If any delta is 0, we got no entropy.  If all are non-zero, we
576 			 * of entropy in the pool, don't block here.  It is
581 			if (ent->pool.entropy >= THRESHOLD_BITS)
587 			 * Verify that we got enough entropy to do one
590 			if (ent->pool.entropy < THRESHOLD_BITS) {
631 		deltae = ISC_MIN(deltae, ent->pool.entropy);
648 	/* put the entropy we almost extracted back */
663 	pool->entropy = 0;
672 	pool->entropy = 0;
908 	 * Hook it into the entropy system.
987 	 * Hook it into the entropy system.
1032 	unsigned int entropy;
1044 		entropy = crunchsamples(ent, sq);
1045 		add_entropy(ent, entropy);
1071 		    isc_uint32_t entropy)
1077 	entropypool_adddata(ent, data, length, entropy);
1091 			       " rotate %u entropy %u pseudo %u nsources %u"
1095 		ent->pool.entropy, ent->pool.pseudo,
1117 	estimate = ent->pool.entropy;
1163 	 * entropy multiple times.
1175 				"entropy, since your system is lacking\n"
1280 	 * final_result is ISC_R_SUCCESS if at least one source of entropy