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75 lines
1.9 KiB
C++
75 lines
1.9 KiB
C++
// nonce.cpp
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/* Copyright 2009 10gen Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "stdafx.h"
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#include "nonce.h"
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extern int do_md5_test(void);
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namespace mongo {
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Security::Security() {
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static int n;
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massert("Security is a singleton class", ++n == 1);
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init();
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}
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void Security::init(){
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if( _initialized ) return;
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_initialized = true;
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#if defined(__linux__)
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_devrandom = new ifstream("/dev/urandom", ios::binary|ios::in);
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massert( "can't open dev/urandom", _devrandom->is_open() );
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#elif defined(_WIN32)
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srand(curTimeMicros());
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#else
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srandomdev();
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#endif
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assert( sizeof(nonce) == 8 );
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#ifndef NDEBUG
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if ( do_md5_test() )
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massert("md5 unit test fails", false);
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#endif
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}
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nonce Security::getNonce(){
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static boost::mutex m;
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boostlock lk(m);
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/* question/todo: /dev/random works on OS X. is it better
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to use that than random() / srandom()?
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*/
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nonce n;
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#if defined(__linux__)
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_devrandom->read((char*)&n, sizeof(n));
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massert("devrandom failed", !_devrandom->fail());
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#elif defined(_WIN32)
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n = (((unsigned long long)rand())<<32) | rand();
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#else
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n = (((unsigned long long)random())<<32) | random();
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#endif
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return n;
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}
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bool Security::_initialized;
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Security security;
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} // namespace mongo
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