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1 /*
2 * Copyright (c) 2000-2004,2011,2014 Apple 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 #include <CommonCrypto/CommonRandomSPI.h>
31
32 using namespace UnixPlusPlus;
33
34
35 namespace Security {
36
37
38 //
39 // The common (shared) open file descriptor to /dev/random
40 //
41 ModuleNexus<DevRandomGenerator::Writable> DevRandomGenerator::mWriter;
42
43
44 //
45 // In the current implementation, opening the file descriptor is deferred.
46 //
47 DevRandomGenerator::DevRandomGenerator(bool writable)
48 {
49 }
50
51
52 //
53 // Standard generate (directly from /dev/random)
54 //
55 void DevRandomGenerator::random(void *data, size_t length)
56 {
57 if (CCRandomCopyBytes(kCCRandomDefault, data, length)) {
58 Syslog::error("DevRandomGenerator: failed to generate random");
59 UnixError::throwMe(EIO);
60 }
61 }
62
63
64 //
65 // If you opened for writing, you add entropy to the global pool here
66 //
67 void DevRandomGenerator::addEntropy(const void *data, size_t length)
68 {
69 if (mWriter().write(data, length) != length)
70 UnixError::throwMe(EIO); // short write (shouldn't happen)
71 }
72
73
74 } // end namespace Security