forked from OSchip/llvm-project
155 lines
3.4 KiB
C++
155 lines
3.4 KiB
C++
//===-------------------------- random.cpp --------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include <__config>
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#if defined(_LIBCPP_USING_WIN32_RANDOM)
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// Must be defined before including stdlib.h to enable rand_s().
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#define _CRT_RAND_S
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#endif // defined(_LIBCPP_USING_WIN32_RANDOM)
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#include "random"
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#include "system_error"
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#if defined(__sun__)
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#define rename solaris_headers_are_broken
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#endif // defined(__sun__)
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#if defined(_LIBCPP_USING_DEV_RANDOM)
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#include <fcntl.h>
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#include <unistd.h>
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#elif defined(_LIBCPP_USING_NACL_RANDOM)
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#include <nacl/nacl_random.h>
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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#if defined(_LIBCPP_USING_ARC4_RANDOM)
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random_device::random_device(const string& __token)
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{
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if (__token != "/dev/urandom")
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__throw_system_error(ENOENT, ("random device not supported " + __token).c_str());
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}
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random_device::~random_device()
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{
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}
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unsigned
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random_device::operator()()
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{
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return arc4random();
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}
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#elif defined(_LIBCPP_USING_DEV_RANDOM)
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random_device::random_device(const string& __token)
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: __f_(open(__token.c_str(), O_RDONLY))
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{
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if (__f_ < 0)
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__throw_system_error(errno, ("random_device failed to open " + __token).c_str());
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}
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random_device::~random_device()
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{
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close(__f_);
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}
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unsigned
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random_device::operator()()
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{
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unsigned r;
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size_t n = sizeof(r);
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char* p = reinterpret_cast<char*>(&r);
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while (n > 0)
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{
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ssize_t s = read(__f_, p, n);
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if (s == 0)
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__throw_system_error(ENODATA, "random_device got EOF");
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if (s == -1)
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{
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if (errno != EINTR)
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__throw_system_error(errno, "random_device got an unexpected error");
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continue;
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}
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n -= static_cast<size_t>(s);
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p += static_cast<size_t>(s);
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}
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return r;
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}
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#elif defined(_LIBCPP_USING_NACL_RANDOM)
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random_device::random_device(const string& __token)
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{
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if (__token != "/dev/urandom")
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__throw_system_error(ENOENT, ("random device not supported " + __token).c_str());
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int error = nacl_secure_random_init();
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if (error)
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__throw_system_error(error, ("random device failed to open " + __token).c_str());
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}
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random_device::~random_device()
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{
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}
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unsigned
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random_device::operator()()
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{
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unsigned r;
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size_t n = sizeof(r);
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size_t bytes_written;
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int error = nacl_secure_random(&r, n, &bytes_written);
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if (error != 0)
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__throw_system_error(error, "random_device failed getting bytes");
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else if (bytes_written != n)
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__throw_runtime_error("random_device failed to obtain enough bytes");
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return r;
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}
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#elif defined(_LIBCPP_USING_WIN32_RANDOM)
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random_device::random_device(const string& __token)
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{
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if (__token != "/dev/urandom")
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__throw_system_error(ENOENT, ("random device not supported " + __token).c_str());
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}
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random_device::~random_device()
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{
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}
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unsigned
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random_device::operator()()
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{
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unsigned r;
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errno_t err = rand_s(&r);
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if (err)
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__throw_system_error(err, "random_device rand_s failed.");
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return r;
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}
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#else
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#error "Random device not implemented for this architecture"
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#endif
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double
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random_device::entropy() const _NOEXCEPT
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{
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return 0;
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}
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_LIBCPP_END_NAMESPACE_STD
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