Page MenuHomeFreeBSD
Differential D19948 Diff 56322 sys/libkern/arc4random.c

Changeset View

Standalone View

View Options

sys/libkern/arc4random.c

Show All 30 Lines
#include <sys/types.h> #include <sys/types.h>
#include <sys/param.h> #include <sys/param.h>
#include <sys/kernel.h> #include <sys/kernel.h>
#include <sys/libkern.h> #include <sys/libkern.h>
#include <sys/linker.h> #include <sys/linker.h>
#include <sys/lock.h> #include <sys/lock.h>
#include <sys/malloc.h> #include <sys/malloc.h>
#include <sys/mutex.h> #include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/random.h> #include <sys/random.h>
#include <sys/smp.h> #include <sys/smp.h>
#include <sys/time.h> #include <sys/time.h>
#include <crypto/chacha20/chacha.h> #include <crypto/chacha20/chacha.h>
#include <dev/random/randomdev.h> #include <dev/random/randomdev.h>
#include <machine/cpu.h> #include <machine/cpu.h>
▲ Show 20 Lines • Show All 124 Lines • ▼ Show 20 Lines
*/ */
void void
arc4rand(void *ptr, u_int len, int reseed) arc4rand(void *ptr, u_int len, int reseed)
{ {
struct chacha20_s *chacha20; struct chacha20_s *chacha20;
struct timeval tv; struct timeval tv;
u_int length; u_int length;
u_int8_t *p; u_int8_t *p;
#ifdef INVARIANTS
if ((curthread->td_pflags & TDP_RNG_SEEDED) == 0)
WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL,
"arc4rand may block once");
#endif
if (reseed || atomic_cmpset_int(&arc4rand_iniseed_state, ARC4_ENTR_HAVE, ARC4_ENTR_SEED)) if (reseed || atomic_cmpset_int(&arc4rand_iniseed_state, ARC4_ENTR_HAVE, ARC4_ENTR_SEED))
CHACHA20_FOREACH(chacha20) CHACHA20_FOREACH(chacha20)
chacha20_randomstir(chacha20); chacha20_randomstir(chacha20);
chacha20 = &chacha20inst[curcpu]; chacha20 = &chacha20inst[curcpu];
getmicrouptime(&tv); getmicrouptime(&tv);
/* We may get unlucky and be migrated off this CPU, but that is expected to be infrequent */ /* We may get unlucky and be migrated off this CPU, but that is expected to be infrequent */
Show All 35 Lines