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#include <security_utilities/devrandom.h> 29#include <security_utilities/logging.h> 30 31using namespace UnixPlusPlus; 32 33 34namespace Security { 35 36 37// 38// The common (shared) open file descriptor to /dev/random 39// 40ModuleNexus<DevRandomGenerator::Readonly> DevRandomGenerator::mReader; 41ModuleNexus<DevRandomGenerator::Writable> DevRandomGenerator::mWriter; 42 43 44// 45// In the current implementation, opening the file descriptor is deferred. 46// 47DevRandomGenerator::DevRandomGenerator(bool writable) 48{ 49} 50 51 52// 53// Standard generate (directly from /dev/random) 54// 55void DevRandomGenerator::random(void *data, size_t length) 56{ 57 try { 58 size_t bytesRead = mReader().read(data, length); 59 if (bytesRead != length) { // short read (shouldn't happen) 60 Syslog::error("DevRandomGenerator: wanted %ld got %ld bytes", 61 length, bytesRead); 62 UnixError::throwMe(EIO); 63 } 64 } catch(const UnixError &uerr) { 65 Syslog::error("DevRandomGenerator: error %d reading /dev/random", 66 uerr.error); 67 throw; 68 } 69} 70 71 72// 73// If you opened for writing, you add entropy to the global pool here 74// 75void DevRandomGenerator::addEntropy(const void *data, size_t length) 76{ 77 if (mWriter().write(data, length) != length) 78 UnixError::throwMe(EIO); // short write (shouldn't happen) 79} 80 81 82} // end namespace Security 83