0951313c1e
This has to leave rust_gen_seed and rng_gen_seed around since they're used to initialise the std::rand RNGs.
84 lines
2.5 KiB
C++
84 lines
2.5 KiB
C++
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#include "rust_globals.h"
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#include "rust_rng.h"
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#include "rust_util.h"
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#ifdef __WIN32__
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void
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win32_require(LPCTSTR fn, BOOL ok) {
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if (!ok) {
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LPTSTR buf;
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DWORD err = GetLastError();
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FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
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FORMAT_MESSAGE_FROM_SYSTEM |
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FORMAT_MESSAGE_IGNORE_INSERTS,
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NULL, err,
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MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
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(LPTSTR) &buf, 0, NULL );
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fprintf(stderr, "%s failed with error %ld: %s", fn, err, buf);
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LocalFree((HLOCAL)buf);
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abort();
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}
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}
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#endif
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void
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rng_gen_seed(uint8_t* dest, size_t size) {
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#ifdef __WIN32__
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HCRYPTPROV hProv;
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win32_require
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(_T("CryptAcquireContext"),
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CryptAcquireContext(&hProv, NULL, NULL, PROV_RSA_FULL,
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CRYPT_VERIFYCONTEXT|CRYPT_SILENT));
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win32_require
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(_T("CryptGenRandom"), CryptGenRandom(hProv, size, (BYTE*) dest));
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win32_require
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(_T("CryptReleaseContext"), CryptReleaseContext(hProv, 0));
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#else
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int fd = open("/dev/urandom", O_RDONLY);
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if (fd == -1) {
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fprintf(stderr, "error opening /dev/urandom: %s", strerror(errno));
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abort();
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}
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size_t amount = 0;
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do {
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ssize_t ret = read(fd, dest+amount, size-amount);
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if (ret < 0) {
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fprintf(stderr, "error reading /dev/urandom: %s", strerror(errno));
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abort();
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}
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else if (ret == 0) {
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fprintf(stderr, "somehow hit eof reading from /dev/urandom");
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abort();
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}
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amount += (size_t)ret;
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} while (amount < size);
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int ret = close(fd);
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if (ret != 0) {
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fprintf(stderr, "error closing /dev/urandom: %s", strerror(errno));
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// FIXME #3697: Why does this fail sometimes?
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// abort();
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}
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#endif
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}
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//
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// Local Variables:
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// mode: C++
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// fill-column: 78;
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// indent-tabs-mode: nil
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// c-basic-offset: 4
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// buffer-file-coding-system: utf-8-unix
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// End:
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//
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