diff options
Diffstat (limited to 'cross/lib/getrandom.c')
| -rw-r--r-- | cross/lib/getrandom.c | 190 |
1 files changed, 0 insertions, 190 deletions
diff --git a/cross/lib/getrandom.c b/cross/lib/getrandom.c deleted file mode 100644 index 19bb3429baf..00000000000 --- a/cross/lib/getrandom.c +++ /dev/null @@ -1,190 +0,0 @@ -/* Obtain a series of random bytes. - - Copyright 2020-2023 Free Software Foundation, Inc. - - This file is free software: you can redistribute it and/or modify - it under the terms of the GNU Lesser General Public License as - published by the Free Software Foundation; either version 2.1 of the - License, or (at your option) any later version. - - This file is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public License - along with this program. If not, see <https://www.gnu.org/licenses/>. */ - -/* Written by Paul Eggert. */ - -#include <config.h> - -#include <sys/random.h> - -#include <errno.h> -#include <fcntl.h> -#include <unistd.h> - -#if defined _WIN32 && ! defined __CYGWIN__ -# define WIN32_LEAN_AND_MEAN -# include <windows.h> -# if HAVE_BCRYPT_H -# include <bcrypt.h> -# else -# define NTSTATUS LONG -typedef void * BCRYPT_ALG_HANDLE; -# define BCRYPT_USE_SYSTEM_PREFERRED_RNG 0x00000002 -# if HAVE_LIB_BCRYPT -extern NTSTATUS WINAPI BCryptGenRandom (BCRYPT_ALG_HANDLE, UCHAR *, ULONG, ULONG); -# endif -# endif -# if !HAVE_LIB_BCRYPT -# include <wincrypt.h> -# ifndef CRYPT_VERIFY_CONTEXT -# define CRYPT_VERIFY_CONTEXT 0xF0000000 -# endif -# endif -#endif - -#include "minmax.h" - -#if defined _WIN32 && ! defined __CYGWIN__ - -/* Don't assume that UNICODE is not defined. */ -# undef LoadLibrary -# define LoadLibrary LoadLibraryA -# undef CryptAcquireContext -# define CryptAcquireContext CryptAcquireContextA - -# if !HAVE_LIB_BCRYPT - -/* Avoid warnings from gcc -Wcast-function-type. */ -# define GetProcAddress \ - (void *) GetProcAddress - -/* BCryptGenRandom with the BCRYPT_USE_SYSTEM_PREFERRED_RNG flag works only - starting with Windows 7. */ -typedef NTSTATUS (WINAPI * BCryptGenRandomFuncType) (BCRYPT_ALG_HANDLE, UCHAR *, ULONG, ULONG); -static BCryptGenRandomFuncType BCryptGenRandomFunc = NULL; -static BOOL initialized = FALSE; - -static void -initialize (void) -{ - HMODULE bcrypt = LoadLibrary ("bcrypt.dll"); - if (bcrypt != NULL) - { - BCryptGenRandomFunc = - (BCryptGenRandomFuncType) GetProcAddress (bcrypt, "BCryptGenRandom"); - } - initialized = TRUE; -} - -# else - -# define BCryptGenRandomFunc BCryptGenRandom - -# endif - -#else -/* These devices exist on all platforms except native Windows. */ - -/* Name of a device through which the kernel returns high quality random - numbers, from an entropy pool. When the pool is empty, the call blocks - until entropy sources have added enough bits of entropy. */ -# ifndef NAME_OF_RANDOM_DEVICE -# define NAME_OF_RANDOM_DEVICE "/dev/random" -# endif - -/* Name of a device through which the kernel returns random or pseudo-random - numbers. It uses an entropy pool, but, in order to avoid blocking, adds - bits generated by a pseudo-random number generator, as needed. */ -# ifndef NAME_OF_NONCE_DEVICE -# define NAME_OF_NONCE_DEVICE "/dev/urandom" -# endif - -#endif - -/* Set BUFFER (of size LENGTH) to random bytes under the control of FLAGS. - Return the number of bytes written (> 0). - Upon error, return -1 and set errno. */ -ssize_t -getrandom (void *buffer, size_t length, unsigned int flags) -#undef getrandom -{ -#if defined _WIN32 && ! defined __CYGWIN__ - /* BCryptGenRandom, defined in <bcrypt.h> - <https://docs.microsoft.com/en-us/windows/win32/api/bcrypt/nf-bcrypt-bcryptgenrandom> - with the BCRYPT_USE_SYSTEM_PREFERRED_RNG flag - works in Windows 7 and newer. */ - static int bcrypt_not_working /* = 0 */; - if (!bcrypt_not_working) - { -# if !HAVE_LIB_BCRYPT - if (!initialized) - initialize (); -# endif - if (BCryptGenRandomFunc != NULL - && BCryptGenRandomFunc (NULL, buffer, length, - BCRYPT_USE_SYSTEM_PREFERRED_RNG) - == 0 /*STATUS_SUCCESS*/) - return length; - bcrypt_not_working = 1; - } -# if !HAVE_LIB_BCRYPT - /* CryptGenRandom, defined in <wincrypt.h> - <https://docs.microsoft.com/en-us/windows/win32/api/wincrypt/nf-wincrypt-cryptgenrandom> - works in older releases as well, but is now deprecated. - CryptAcquireContext, defined in <wincrypt.h> - <https://docs.microsoft.com/en-us/windows/win32/api/wincrypt/nf-wincrypt-cryptacquirecontexta> */ - { - static int crypt_initialized /* = 0 */; - static HCRYPTPROV provider; - if (!crypt_initialized) - { - if (CryptAcquireContext (&provider, NULL, NULL, PROV_RSA_FULL, - CRYPT_VERIFY_CONTEXT)) - crypt_initialized = 1; - else - crypt_initialized = -1; - } - if (crypt_initialized >= 0) - { - if (!CryptGenRandom (provider, length, buffer)) - { - errno = EIO; - return -1; - } - return length; - } - } -# endif - errno = ENOSYS; - return -1; -#elif HAVE_GETRANDOM - return getrandom (buffer, length, flags); -#else - static int randfd[2] = { -1, -1 }; - bool devrandom = (flags & GRND_RANDOM) != 0; - int fd = randfd[devrandom]; - - if (fd < 0) - { - static char const randdevice[][MAX (sizeof NAME_OF_NONCE_DEVICE, - sizeof NAME_OF_RANDOM_DEVICE)] - = { NAME_OF_NONCE_DEVICE, NAME_OF_RANDOM_DEVICE }; - int oflags = (O_RDONLY + O_CLOEXEC - + (flags & GRND_NONBLOCK ? O_NONBLOCK : 0)); - fd = open (randdevice[devrandom], oflags); - if (fd < 0) - { - if (errno == ENOENT || errno == ENOTDIR) - errno = ENOSYS; - return -1; - } - randfd[devrandom] = fd; - } - - return read (fd, buffer, length); -#endif -} |