From ad69438311efca4b703388fafb1a5443bf9dc220 Mon Sep 17 00:00:00 2001
From: Reece <code@reece.sx>
Date: Wed, 6 Jan 2021 00:59:00 +0000
Subject: [PATCH] Nuke platform RNG

---
 s_mp_rand_platform.c | 149 -------------------------------------------
 1 file changed, 149 deletions(-)

diff --git a/s_mp_rand_platform.c b/s_mp_rand_platform.c
index 06b2f1b..e69de29 100644
--- a/s_mp_rand_platform.c
+++ b/s_mp_rand_platform.c
@@ -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