uint32_t
arc4random(void)
{
if (!rs_initialized)
__arc4random_stir();
return arc4_getword(&rs);
}
int
iterator_next(iterator *iter)
{
iter->off += (arc4_getword(&iter->as) % iter->skipmod) + 1;
return (iter->off);
}
u_int32_t
arc4random(void)
{
arc4_count -= 4;
if (arc4_count <= 0 || !rs_initialized || arc4_stir_pid != getpid())
__arc4random_stir();
return arc4_getword(&rs);
}
uint32_t
arc4random_pushb(const void *src, size_t len)
{
size_t rlen;
union {
uint8_t buf[256];
struct {
struct timeval tv;
const void *sp, *dp;
size_t sz;
uint32_t vu;
} s;
uint32_t xbuf;
} idat;
uint32_t res = 1;
if (!rs_initialized) {
arc4_init();
rs_initialized = 1;
}
idat.s.sp = &idat;
idat.s.dp = src;
idat.s.sz = len;
idat.s.vu = arc4_getword();
gettimeofday(&idat.s.tv, NULL);
rlen = MAX(sizeof(idat.s), len);
while (rlen--)
idat.buf[rlen % sizeof(idat.buf)] ^=
((const uint8_t *)src)[rlen % len];
rlen = MIN(sizeof(idat), MAX(sizeof(idat.s), len));
if (arc4_writeback((void *)&idat, rlen, 1))
res = 0;
arc4_addrandom((void *)&idat, rlen);
rlen = arc4_getbyte() & 1;
if (res)
res = idat.xbuf;
else
/* we got entropy from the kernel, so consider us stirred */
stir_finish(idat.buf[5]);
if (rlen)
(void)arc4_getbyte();
return (res ^ arc4_getword());
}
uint32_t
arc4random()
{
arc4_count -= 4;
if (!rs_initialized || arc4_count <= 0)
arc4random_stir();
return arc4_getword(&rs);
}
u_int32_t arc4random(void)
{
u_int32_t val;
arc4_count -= 4;
if (arc4_count <= 0 || !rs_initialized)
arc4_stir();
val = arc4_getword();
return val;
}
ARC4RANDOM_EXPORT ARC4RANDOM_UINT32
arc4random(void)
{
ARC4RANDOM_UINT32 val;
_ARC4_LOCK();
arc4_count -= 4;
arc4_stir_if_needed();
val = arc4_getword();
_ARC4_UNLOCK();
return val;
}
u_int32_t
arc4random(void)
{
u_int32_t val;
_ARC4_LOCK();
arc4_count -= 4;
arc4_stir_if_needed();
val = arc4_getword();
_ARC4_UNLOCK();
return val;
}
unsigned int
arc4random(void)
{
unsigned int rnd;
arc4_check_init();
arc4_check_stir();
rnd = arc4_getword(&rs);
return (rnd);
}
u_int32_t
arc4random(void)
{
u_int32_t val;
_ARC4_LOCK();
arc4_count -= 4;
if (arc4_count <= 0 || !rs_initialized || arc4_stir_pid != getpid())
arc4_stir();
val = arc4_getword();
_ARC4_UNLOCK();
return val;
}
u_int32_t
arc4random(void)
{
u_int32_t rnd;
THREAD_LOCK();
arc4_check_init();
arc4_check_stir();
rnd = arc4_getword();
arc4_count -= 4;
THREAD_UNLOCK();
return (rnd);
}
HB_U32 hb_arc4random( void )
{
HB_U32 val;
ARC4_LOCK();
arc4_count -= 4;
arc4_stir_if_needed();
val = arc4_getword();
ARC4_UNLOCK();
return val;
}
void
iterator_init(iterator *iter, struct arc4_stream *as)
{
int i;
char derive[16];
iter->skipmod = INIT_SKIPMOD;
iter->as = *as;
/* Put the PRNG in different state, using key dependant data
* provided by the PRNG itself.
*/
for (i = 0; i < sizeof(derive); i++)
derive[i] = arc4_getbyte(&iter->as);
arc4_addrandom(&iter->as, derive, sizeof(derive));
iter->off = arc4_getword(&iter->as) % iter->skipmod;
}
/*
* Calculate a uniformly distributed random number less than
* upper_bound avoiding "modulo bias".
*
* Uniformity is achieved by generating new random numbers
* until the one returned is outside the range
* [0, 2^32 % upper_bound[. This guarantees the selected
* random number will be inside the range
* [2^32 % upper_bound, 2^32[ which maps back to
* [0, upper_bound[ after reduction modulo upper_bound.
*/
uint32_t
arc4random_uniform(uint32_t upper_bound)
{
uint32_t r, min;
if (upper_bound < 2)
return (0);
#if defined(ULONG_MAX) && (ULONG_MAX > 0xFFFFFFFFUL)
min = 0x100000000UL % upper_bound;
#else
/* calculate (2^32 % upper_bound) avoiding 64-bit math */
if (upper_bound > 0x80000000U)
/* 2^32 - upper_bound (only one "value area") */
min = 1 + ~upper_bound;
else
/* ((2^32 - x) % x) == (2^32 % x) when x <= 2^31 */
min = (0xFFFFFFFFU - upper_bound + 1) % upper_bound;
#endif
/*
* This could theoretically loop forever but each retry has
* p > 0.5 (worst case, usually far better) of selecting a
* number inside the range we need, so it should rarely need
* to re-roll (at all).
*/
arc4_count -= 4;
if (!rs_initialized || arc4_stir_pid != getpid() || arc4_count <= 0)
arc4random_stir();
if (arc4_getbyte() & 1)
(void)arc4_getbyte();
do {
r = arc4_getword();
} while (r < min);
return (r % upper_bound);
}
