1/* 2 * Copyright (c) 2000-2001 Apple Computer, Inc. All Rights Reserved. 3 * 4 * The contents of this file constitute Original Code as defined in and are 5 * subject to the Apple Public Source License Version 1.2 (the 'License'). 6 * You may not use this file except in compliance with the License. Please obtain 7 * a copy of the License at http://www.apple.com/publicsource and read it before 8 * using this file. 9 * 10 * This Original Code and all software distributed under the License are 11 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS 12 * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT 13 * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR 14 * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the 15 * specific language governing rights and limitations under the License. 16 */ 17 18 19/* 20 * YarrowConnection.cpp - single, process-wide, thread-safe Yarrow client 21 */ 22#include "YarrowConnection.h" 23#include <security_utilities/globalizer.h> 24#include <security_utilities/devrandom.h> 25#include <Security/cssmtype.h> 26 27/* instantiated by C++ runtime at library load/init time */ 28class YarrowConnection : public DevRandomGenerator { 29public: 30 YarrowConnection() : DevRandomGenerator(getuid() == 0), writable(getuid() == 0) { } 31 const bool writable; 32}; 33 34/* the single global thing */ 35static ModuleNexus<YarrowConnection> yarrowConnection; 36 37 38/* and the exported functions */ 39void cspGetRandomBytes(void *buf, unsigned len) 40{ 41 yarrowConnection().random(buf, len); 42} 43 44void cspAddEntropy(const void *buf, unsigned len) 45{ 46 if (yarrowConnection().writable) 47 yarrowConnection().addEntropy(buf, len); 48} 49