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