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