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Nuke platform RNG

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This commit is contained in:
Reece Wilson 2021-01-06 00:59:00 +00:00
parent c18817cc22
commit ad69438311
1 changed files with 0 additions and 149 deletions
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149
s_mp_rand_platform.c
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@ -1,149 +0,0 @@
#include "tommath_private.h"
#ifdef S_MP_RAND_PLATFORM_C
/* LibTomMath, multiple-precision integer library -- Tom St Denis */
/* SPDX-License-Identifier: Unlicense */
/* First the OS-specific special cases
* - *BSD
* - Windows
*/
#if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) || defined(__DragonFly__)
#define S_READ_ARC4RANDOM_C
static mp_err s_read_arc4random(void *p, size_t n)
{
arc4random_buf(p, n);
return MP_OKAY;
}
#endif
#if defined(_WIN32)
#define S_READ_WINCSP_C
#ifndef _WIN32_WINNT
#define _WIN32_WINNT 0x0501
#endif
#ifndef WINVER
#define WINVER 0x0501
#endif
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <wincrypt.h>
static mp_err s_read_wincsp(void *p, size_t n)
{
static HCRYPTPROV hProv = 0;
if (hProv == 0) {
HCRYPTPROV h = 0;
if (!CryptAcquireContextW(&h, NULL, MS_DEF_PROV_W, PROV_RSA_FULL,
(CRYPT_VERIFYCONTEXT | CRYPT_MACHINE_KEYSET)) &&
!CryptAcquireContextW(&h, NULL, MS_DEF_PROV_W, PROV_RSA_FULL,
CRYPT_VERIFYCONTEXT | CRYPT_MACHINE_KEYSET | CRYPT_NEWKEYSET)) {
return MP_ERR;
}
hProv = h;
}
return CryptGenRandom(hProv, (DWORD)n, (BYTE *)p) == TRUE ? MP_OKAY : MP_ERR;
}
#endif /* WIN32 */
#if !defined(S_READ_WINCSP_C) && defined(__linux__) && defined(__GLIBC_PREREQ)
#if __GLIBC_PREREQ(2, 25)
#define S_READ_GETRANDOM_C
#include <sys/random.h>
#include <errno.h>
static mp_err s_read_getrandom(void *p, size_t n)
{
char *q = (char *)p;
while (n > 0u) {
ssize_t ret = getrandom(q, n, 0);
if (ret < 0) {
if (errno == EINTR) {
continue;
}
return MP_ERR;
}
q += ret;
n -= (size_t)ret;
}
return MP_OKAY;
}
#endif
#endif
/* We assume all platforms besides windows provide "/dev/urandom".
* In case yours doesn't, define MP_NO_DEV_URANDOM at compile-time.
*/
#if !defined(S_READ_WINCSP_C) && !defined(MP_NO_DEV_URANDOM)
#define S_READ_URANDOM_C
#ifndef MP_DEV_URANDOM
#define MP_DEV_URANDOM "/dev/urandom"
#endif
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
static mp_err s_read_urandom(void *p, size_t n)
{
int fd;
char *q = (char *)p;
do {
fd = open(MP_DEV_URANDOM, O_RDONLY);
} while ((fd == -1) && (errno == EINTR));
if (fd == -1) return MP_ERR;
while (n > 0u) {
ssize_t ret = read(fd, p, n);
if (ret < 0) {
if (errno == EINTR) {
continue;
}
close(fd);
return MP_ERR;
}
q += ret;
n -= (size_t)ret;
}
close(fd);
return MP_OKAY;
}
#endif
mp_err s_read_arc4random(void *p, size_t n);
mp_err s_read_wincsp(void *p, size_t n);
mp_err s_read_getrandom(void *p, size_t n);
mp_err s_read_urandom(void *p, size_t n);
/*
* Note: libtommath relies on dead code elimination
* for the configuration system, i.e., the MP_HAS macro.
*
* If you observe linking errors in this functions,
* your compiler does not perform the dead code compilation
* such that the unused functions are still referenced.
*
* This happens for example for MSVC if the /Od compilation
* option is given. The option /Od instructs MSVC to
* not perform any "optimizations", not even removal of
* dead code wrapped in `if (0)` blocks.
*
* If you still insist on compiling with /Od, simply
* comment out the lines which result in linking errors.
*
* We intentionally don't fix this issue in order
* to have a single point of failure for misconfigured compilers.
*/
mp_err s_mp_rand_platform(void *p, size_t n)
{
mp_err err = MP_ERR;
if ((err != MP_OKAY) && MP_HAS(S_READ_ARC4RANDOM)) err = s_read_arc4random(p, n);
if ((err != MP_OKAY) && MP_HAS(S_READ_WINCSP)) err = s_read_wincsp(p, n);
if ((err != MP_OKAY) && MP_HAS(S_READ_GETRANDOM)) err = s_read_getrandom(p, n);
if ((err != MP_OKAY) && MP_HAS(S_READ_URANDOM)) err = s_read_urandom(p, n);
return err;
}
#endif