projects / apple / security.git / blame
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|---|---|---|
| d8f41ccd A |
1 | /* |
| 2 | * Copyright (c) 2000-2004,2006 Apple Computer, Inc. All Rights Reserved. | |
| 3 | * | |
| 4 | * @APPLE_LICENSE_HEADER_START@ | |
| 5 | * | |
| 6 | * This file contains Original Code and/or Modifications of Original Code | |
| 7 | * as defined in and that are subject to the Apple Public Source License | |
| 8 | * Version 2.0 (the 'License'). You may not use this file except in | |
| 9 | * compliance with the License. Please obtain a copy of the License at | |
| 10 | * http://www.opensource.apple.com/apsl/ and read it before using this | |
| 11 | * file. | |
| 12 | * | |
| 13 | * The Original Code and all software distributed under the License are | |
| 14 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
| 15 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, | |
| 16 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| 17 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. | |
| 18 | * Please see the License for the specific language governing rights and | |
| 19 | * limitations under the License. | |
| 20 | * | |
| 21 | * @APPLE_LICENSE_HEADER_END@ | |
| 22 | */ | |
| 23 | ||
| 24 | ||
| 25 | // | |
| 26 | // entropy - periodical to collect and seed entropy into /dev/random | |
| 27 | // | |
| 28 | #ifndef _H_ENTROPY | |
| 29 | #define _H_ENTROPY | |
| 30 | ||
| 31 | #include <security_utilities/machserver.h> | |
| 32 | #include <security_utilities/timeflow.h> | |
| 33 | #include <security_utilities/devrandom.h> | |
| 34 | ||
| 35 | using namespace Security; | |
| 36 | using MachPlusPlus::MachServer; | |
| 37 | ||
| 38 | ||
| 39 | // | |
| 40 | // A (one-off) timer object that manages system entropy | |
| 41 | // | |
| 42 | class EntropyManager : public MachServer::Timer, private DevRandomGenerator { | |
| 43 | // all the parameters you ever (should) want to change :-) | |
| 44 | static const int collectInterval = 600; // collect every 10 minutes | |
| 45 | static const int updateInterval = 3600 * 6; // update file every 6 hours | |
| 46 | static const int timingsToCollect = 40; // how many timings? | |
| 47 | ||
| 48 | public: | |
| 49 | EntropyManager(MachPlusPlus::MachServer &srv, const char *entropyFile); | |
| 50 | ||
| 51 | void action(); | |
| 52 | ||
| 53 | MachPlusPlus::MachServer &server; // to which we do setTimer() | |
| 54 | ||
| 55 | private: | |
| 56 | string mEntropyFilePath; // absolute path to entropy file | |
| 57 | Time::Absolute mNextUpdate; // next time for entropy file update | |
| 58 | ||
| 59 | void collectEntropy(); // collect system timings and seed RNG | |
| 60 | void updateEntropyFile(); // update entropy file from RNG if it's time | |
| 61 | ||
| 62 | static const size_t entropyFileSize = 20; // bytes (effectively one SHA-1 worth) | |
| 63 | }; | |
| 64 | ||
| 65 | #endif //_H_ENTROPY |