| /* |
| * Copyright (C) 2011 Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY GOOGLE, INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "OSRandomSource.h" |
| |
| #include <stdint.h> |
| #include <stdlib.h> |
| |
| #if OS(UNIX) |
| #include <fcntl.h> |
| #include <unistd.h> |
| #endif |
| |
| #if OS(WINDOWS) |
| #include <windows.h> |
| #include <wincrypt.h> // windows.h must be included before wincrypt.h. |
| #endif |
| |
| #if defined(__LB_SHELL__) |
| #include "lb_rand.h" |
| #endif |
| |
| #if OS(STARBOARD) |
| #include "starboard/system.h" |
| #endif |
| |
| namespace WTF { |
| |
| #if USE(OS_RANDOMNESS) |
| void cryptographicallyRandomValuesFromOS(unsigned char* buffer, size_t length) |
| { |
| #if OS(STARBOARD) |
| SbSystemGetRandomData(buffer, length); |
| #elif defined(__LB_SHELL__) |
| lb_get_random_bytes(reinterpret_cast<char *>(buffer), length); |
| #elif OS(UNIX) |
| int fd = open("/dev/urandom", O_RDONLY, 0); |
| if (fd < 0) |
| CRASH(); // We need /dev/urandom for this API to work... |
| |
| if (read(fd, buffer, length) != static_cast<ssize_t>(length)) |
| CRASH(); |
| |
| close(fd); |
| #elif OS(WINDOWS) |
| HCRYPTPROV hCryptProv = 0; |
| if (!CryptAcquireContext(&hCryptProv, 0, MS_DEF_PROV, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT)) |
| CRASH(); |
| if (!CryptGenRandom(hCryptProv, length, buffer)) |
| CRASH(); |
| CryptReleaseContext(hCryptProv, 0); |
| #else |
| #error "This configuration doesn't have a strong source of randomness." |
| // WARNING: When adding new sources of OS randomness, the randomness must |
| // be of cryptographic quality! |
| #endif |
| } |
| #endif |
| |
| } |