/* * Copyright (c) 2000-2001 Apple Computer, Inc. All Rights Reserved. * * The contents of this file constitute Original Code as defined in and are * subject to the Apple Public Source License Version 1.2 (the 'License'). * You may not use this file except in compliance with the License. Please obtain * a copy of the License at http://www.apple.com/publicsource and read it before * using this file. * * This Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the * specific language governing rights and limitations under the License. */ // // yarrowseed - periodical to collect and seed entropy into /dev/random // #ifndef _H_ENTROPY #define _H_ENTROPY #include #include #include using namespace Security; using MachPlusPlus::MachServer; // // A (one-off) timer object that manages system entropy // class EntropyManager : public MachServer::Timer, private DevRandomGenerator { // all the parameters you ever (should) want to change :-) static const int collectInterval = 600; // collect every 10 minutes static const int updateInterval = 3600; // update file every hour static const int timingsToCollect = 40; // how many timings? public: EntropyManager(MachPlusPlus::MachServer &srv, const char *entropyFile); void action(); MachPlusPlus::MachServer &server; // to which we do setTimer() private: string mEntropyFilePath; // absolute path to entropy file Time::Absolute mNextUpdate; // next time for entropy file update void collectEntropy(); // collect system timings and seed RNG void updateEntropyFile(); // update entropy file from RNG if it's time static const size_t entropyFileSize = 20; // bytes (effectively one SHA-1 worth) }; #endif //_H_ENTROPY