Mercurial > dropbear
view libtommath/bn_s_mp_rand_platform.c @ 1723:5386011b740d
Disable toom and karatsuba for new libtommath
author | Matt Johnston <matt@ucc.asn.au> |
---|---|
date | Thu, 18 Jun 2020 19:12:07 +0800 |
parents | 1051e4eea25a |
children |
line wrap: on
line source
#include "tommath_private.h" #ifdef BN_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 BN_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) || defined(_WIN32_WCE) #define BN_S_READ_WINCSP_C #ifndef _WIN32_WINNT #define _WIN32_WINNT 0x0400 #endif #ifdef _WIN32_WCE #define UNDER_CE #define ARM #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 (!CryptAcquireContext(&h, NULL, MS_DEF_PROV, PROV_RSA_FULL, (CRYPT_VERIFYCONTEXT | CRYPT_MACHINE_KEYSET)) && !CryptAcquireContext(&h, NULL, MS_DEF_PROV, 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(BN_S_READ_WINCSP_C) && defined(__linux__) && defined(__GLIBC_PREREQ) #if __GLIBC_PREREQ(2, 25) #define BN_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(BN_S_READ_WINCSP_C) && !defined(MP_NO_DEV_URANDOM) #define BN_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 #if defined(MP_PRNG_ENABLE_LTM_RNG) #define BN_S_READ_LTM_RNG unsigned long (*ltm_rng)(unsigned char *out, unsigned long outlen, void (*callback)(void)); void (*ltm_rng_callback)(void); static mp_err s_read_ltm_rng(void *p, size_t n) { unsigned long res; if (ltm_rng == NULL) return MP_ERR; res = ltm_rng(p, n, ltm_rng_callback); if (res != n) return MP_ERR; 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); mp_err s_read_ltm_rng(void *p, size_t n); 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); if ((err != MP_OKAY) && MP_HAS(S_READ_LTM_RNG)) err = s_read_ltm_rng(p, n); return err; } #endif