/* * Copyright (c) 2000-2004 Apple Computer, Inc. All Rights Reserved. * * @APPLE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this * file. * * The 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. * * @APPLE_LICENSE_HEADER_END@ */ // // devrandom - RNG operations based on /dev/random // #ifndef _H_DEVRANDOM #define _H_DEVRANDOM #include <security_utilities/utilities.h> #include <security_utilities/unix++.h> #include <security_utilities/globalizer.h> namespace Security { // // This RNG uses /dev/random. // It is not repeatable. AddEntropy() contributes random entropy to a global pool (only). // class DevRandomGenerator { struct Readonly : public UnixPlusPlus::FileDesc { Readonly() { open("/dev/random", O_RDONLY); } }; struct Writable : public UnixPlusPlus::FileDesc { Writable() { open("/dev/random", O_RDWR); } }; public: DevRandomGenerator(bool writable = false); void random(void *data, size_t length); void addEntropy(const void *data, size_t length); private: static ModuleNexus<Readonly> mReader; static ModuleNexus<Writable> mWriter; }; }; // end namespace Security #endif //_H_DEVRANDOM