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Diffstat (limited to 'Source/JavaScriptCore/wtf/OSRandomSource.cpp')
-rw-r--r-- | Source/JavaScriptCore/wtf/OSRandomSource.cpp | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/Source/JavaScriptCore/wtf/OSRandomSource.cpp b/Source/JavaScriptCore/wtf/OSRandomSource.cpp new file mode 100644 index 0000000..0c1416a --- /dev/null +++ b/Source/JavaScriptCore/wtf/OSRandomSource.cpp @@ -0,0 +1,71 @@ +/* + * 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 + +namespace WTF { + +#if USE(OS_RANDOMNESS) +void cryptographicallyRandomValuesFromOS(unsigned char* buffer, size_t length) +{ +#if 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 + +} |