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#include <sys/types.h>
#ifndef _WIN32
# include <sys/stat.h>
# include <sys/time.h>
#endif
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#ifndef _WIN32
# include <unistd.h>
#endif
#include "randombytes.h"
#include "randombytes_sysrandom.h"
#include "utils.h"
#ifdef _WIN32
# include <windows.h>
# define RtlGenRandom SystemFunction036
# if defined(__cplusplus)
extern "C"
# endif
BOOLEAN NTAPI RtlGenRandom(PVOID RandomBuffer, ULONG RandomBufferLength);
# pragma comment(lib, "advapi32.lib")
#endif
#ifdef __OpenBSD__
uint32_t
randombytes_sysrandom(void)
{
return arc4random();
}
void
randombytes_sysrandom_stir(void)
{
}
uint32_t
randombytes_sysrandom_uniform(const uint32_t upper_bound)
{
return arc4random_uniform(upper_bound);
}
void
randombytes_sysrandom_buf(void * const buf, const size_t size)
{
return arc4random_buf(buf, size);
}
int
randombytes_sysrandom_close(void)
{
return 0;
}
#else /* __OpenBSD__ */
typedef struct SysRandom_ {
int random_data_source_fd;
int initialized;
} SysRandom;
static SysRandom stream = {
SODIUM_C99(.random_data_source_fd =) -1,
SODIUM_C99(.initialized =) 0
};
#ifndef _WIN32
static ssize_t
safe_read(const int fd, void * const buf_, size_t count)
{
unsigned char *buf = (unsigned char *) buf_;
ssize_t readnb;
assert(count > (size_t) 0U);
do {
while ((readnb = read(fd, buf, count)) < (ssize_t) 0 &&
(errno == EINTR || errno == EAGAIN)); /* LCOV_EXCL_LINE */
if (readnb < (ssize_t) 0) {
return readnb; /* LCOV_EXCL_LINE */
}
if (readnb == (ssize_t) 0) {
break; /* LCOV_EXCL_LINE */
}
count -= (size_t) readnb;
buf += readnb;
} while (count > (ssize_t) 0);
return (ssize_t) (buf - (unsigned char *) buf_);
}
#endif
#ifndef _WIN32
static int
randombytes_sysrandom_random_dev_open(void)
{
/* LCOV_EXCL_START */
struct stat st;
static const char *devices[] = {
# ifndef USE_BLOCKING_RANDOM
"/dev/urandom",
# endif
"/dev/random", NULL
};
const char ** device = devices;
int fd;
do {
fd = open(*device, O_RDONLY);
if (fd != -1) {
if (fstat(fd, &st) == 0 && S_ISCHR(st.st_mode)) {
# if defined(F_SETFD) && defined(FD_CLOEXEC)
(void) fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC);
# endif
return fd;
}
(void) close(fd);
} else if (errno == EINTR) {
continue;
}
device++;
} while (*device != NULL);
errno = EIO;
return -1;
/* LCOV_EXCL_STOP */
}
static void
randombytes_sysrandom_init(void)
{
const int errno_save = errno;
if ((stream.random_data_source_fd =
randombytes_sysrandom_random_dev_open()) == -1) {
abort(); /* LCOV_EXCL_LINE */
}
errno = errno_save;
}
#else /* _WIN32 */
static void
randombytes_sysrandom_init(void)
{
}
#endif
void
randombytes_sysrandom_stir(void)
{
if (stream.initialized == 0) {
randombytes_sysrandom_init();
stream.initialized = 1;
}
}
static void
randombytes_sysrandom_stir_if_needed(void)
{
if (stream.initialized == 0) {
randombytes_sysrandom_stir();
}
}
int
randombytes_sysrandom_close(void)
{
int ret = -1;
#ifndef _WIN32
if (stream.random_data_source_fd != -1 &&
close(stream.random_data_source_fd) == 0) {
stream.random_data_source_fd = -1;
stream.initialized = 0;
ret = 0;
}
#else /* _WIN32 */
if (stream.initialized != 0) {
stream.initialized = 0;
ret = 0;
}
#endif
return ret;
}
uint32_t
randombytes_sysrandom(void)
{
uint32_t r;
randombytes_sysrandom_buf(&r, sizeof r);
return r;
}
void
randombytes_sysrandom_buf(void * const buf, const size_t size)
{
randombytes_sysrandom_stir_if_needed();
#ifdef ULONG_LONG_MAX
/* coverity[result_independent_of_operands] */
assert(size <= ULONG_LONG_MAX);
#endif
#ifndef _WIN32
if (safe_read(stream.random_data_source_fd, buf, size) != (ssize_t) size) {
abort(); /* LCOV_EXCL_LINE */
}
#else
if (size > (size_t) 0xffffffff) {
abort(); /* LCOV_EXCL_LINE */
}
if (! RtlGenRandom((PVOID) buf, (ULONG) size)) {
abort(); /* LCOV_EXCL_LINE */
}
#endif
}
/*
* randombytes_sysrandom_uniform() derives from OpenBSD's arc4random_uniform()
* Copyright (c) 2008, Damien Miller <djm@openbsd.org>
*/
uint32_t
randombytes_sysrandom_uniform(const uint32_t upper_bound)
{
uint32_t min;
uint32_t r;
if (upper_bound < 2) {
return 0;
}
min = (uint32_t) (-upper_bound % upper_bound);
for (;;) {
r = randombytes_sysrandom();
if (r >= min) {
break;
}
} /* LCOV_EXCL_LINE */
return r % upper_bound;
}
#endif
const char *
randombytes_sysrandom_implementation_name(void)
{
return "sysrandom";
}
struct randombytes_implementation randombytes_sysrandom_implementation = {
SODIUM_C99(.implementation_name =) randombytes_sysrandom_implementation_name,
SODIUM_C99(.random =) randombytes_sysrandom,
SODIUM_C99(.stir =) randombytes_sysrandom_stir,
SODIUM_C99(.uniform =) randombytes_sysrandom_uniform,
SODIUM_C99(.buf =) randombytes_sysrandom_buf,
SODIUM_C99(.close =) randombytes_sysrandom_close
};
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