1/* 2 * Copyright (c) 2000-2004 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// devrandom - RNG operations based on /dev/random 27// 28#ifndef _H_DEVRANDOM 29#define _H_DEVRANDOM 30 31#include <security_utilities/utilities.h> 32#include <security_utilities/unix++.h> 33#include <security_utilities/globalizer.h> 34 35 36namespace Security { 37 38 39// 40// This RNG uses /dev/random. 41// It is not repeatable. AddEntropy() contributes random entropy to a global pool (only). 42// 43class DevRandomGenerator { 44 struct Readonly : public UnixPlusPlus::FileDesc { 45 Readonly() { open("/dev/random", O_RDONLY); } 46 }; 47 48 struct Writable : public UnixPlusPlus::FileDesc { 49 Writable() { open("/dev/random", O_RDWR); } 50 }; 51 52public: 53 DevRandomGenerator(bool writable = false); 54 55 void random(void *data, size_t length); 56 void addEntropy(const void *data, size_t length); 57 58private: 59 static ModuleNexus<Readonly> mReader; 60 static ModuleNexus<Writable> mWriter; 61}; 62 63 64}; // end namespace Security 65 66 67#endif //_H_DEVRANDOM 68