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/*
* rand.c
*
* Pseudorandom number generation, based on OpenBSD arc4random().
*
* Copyright (c) 2000 Dug Song <dugsong@monkey.org>
* Copyright (c) 1996 David Mazieres <dm@lcs.mit.edu>
* Copyright (c) 2023-2024 Oliver Falk <oliver@linux-kernel.at>
*
*/
#include "config.h"
#ifdef _WIN32
/* XXX */
# undef _WIN32_WINNT
# define _WIN32_WINNT 0x0400
# include <wincrypt.h>
# define inline __inline
#else
# include <sys/types.h>
# include <sys/time.h>
# include <unistd.h>
#endif
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include "dumbnet.h"
struct rand_handle {
uint8_t i;
uint8_t j;
uint8_t s[256];
u_char *tmp;
int tmplen;
};
static inline void
rand_init(rand_t *rand)
{
int i;
for (i = 0; i < 256; i++)
rand->s[i] = i;
rand->i = rand->j = 0;
}
static inline void
rand_addrandom(rand_t *rand, u_char *buf, int len)
{
int i;
uint8_t si;
rand->i--;
for (i = 0; i < 256; i++) {
rand->i = (rand->i + 1);
si = rand->s[rand->i];
rand->j = (rand->j + si + buf[i % len]);
rand->s[rand->i] = rand->s[rand->j];
rand->s[rand->j] = si;
}
rand->j = rand->i;
}
rand_t *
rand_open(void)
{
rand_t *r;
u_char seed[256];
#ifdef _WIN32
HCRYPTPROV hcrypt = 0;
CryptAcquireContext(&hcrypt, NULL, NULL, PROV_RSA_FULL,
CRYPT_VERIFYCONTEXT);
CryptGenRandom(hcrypt, sizeof(seed), seed);
CryptReleaseContext(hcrypt, 0);
#else
struct timeval *tv = (struct timeval *)seed;
int fd;
if ((fd = open("/dev/arandom", O_RDONLY)) != -1 ||
(fd = open("/dev/urandom", O_RDONLY)) != -1) {
/* This is ugly, as we may end up with nothing in buffer, but
* that's very unlikely, anyway, wrappping the read in a conditional
* avoids compiler warning about unused variable */
if(read(fd, seed + sizeof(*tv), sizeof(seed) - sizeof(*tv))) {
// NOOP
}
close(fd);
}
gettimeofday(tv, NULL);
#endif
if ((r = malloc(sizeof(*r))) != NULL) {
rand_init(r);
rand_addrandom(r, seed, 128);
rand_addrandom(r, seed + 128, 128);
r->tmp = NULL;
r->tmplen = 0;
}
return (r);
}
static uint8_t
rand_getbyte(rand_t *r)
{
uint8_t si, sj;
r->i = (r->i + 1);
si = r->s[r->i];
r->j = (r->j + si);
sj = r->s[r->j];
r->s[r->i] = sj;
r->s[r->j] = si;
return (r->s[(si + sj) & 0xff]);
}
int
rand_get(rand_t *r, void *buf, size_t len)
{
u_char *p;
u_int i;
for (p = buf, i = 0; i < len; i++) {
p[i] = rand_getbyte(r);
}
return (0);
}
int
rand_set(rand_t *r, const void *buf, size_t len)
{
rand_init(r);
rand_addrandom(r, (u_char *)buf, len);
rand_addrandom(r, (u_char *)buf, len);
return (0);
}
int
rand_add(rand_t *r, const void *buf, size_t len)
{
rand_addrandom(r, (u_char *)buf, len);
return (0);
}
uint8_t
rand_uint8(rand_t *r)
{
return (rand_getbyte(r));
}
uint16_t
rand_uint16(rand_t *r)
{
uint16_t val;
val = rand_getbyte(r) << 8;
val |= rand_getbyte(r);
return (val);
}
uint32_t
rand_uint32(rand_t *r)
{
uint32_t val;
val = rand_getbyte(r) << 24;
val |= rand_getbyte(r) << 16;
val |= rand_getbyte(r) << 8;
val |= rand_getbyte(r);
return (val);
}
int
rand_shuffle(rand_t *r, void *base, size_t nmemb, size_t size)
{
u_char *save, *src, *dst, *start = (u_char *)base;
u_int i, j;
if (nmemb < 2)
return (0);
if ((u_int)r->tmplen < size) {
if (r->tmp == NULL) {
if ((save = malloc(size)) == NULL)
return (-1);
} else if ((save = realloc(r->tmp, size)) == NULL)
return (-1);
r->tmp = save;
r->tmplen = size;
} else
save = r->tmp;
for (i = 0; i < nmemb; i++) {
if ((j = rand_uint32(r) % (nmemb - 1)) != i) {
src = start + (size * i);
dst = start + (size * j);
memcpy(save, dst, size);
memcpy(dst, src, size);
memcpy(src, save, size);
}
}
return (0);
}
rand_t *
rand_close(rand_t *r)
{
if (r != NULL) {
if (r->tmp != NULL)
free(r->tmp);
free(r);
}
return (NULL);
}
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