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/security/nss/lib/freebl/sysrand.c

http://github.com/zpao/v8monkey
C | 78 lines | 27 code | 10 blank | 41 comment | 3 complexity | b9a899e477388ab820cf6afef97ab139 MD5 | raw file
 1/* ***** BEGIN LICENSE BLOCK *****
 2 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 3 *
 4 * The contents of this file are subject to the Mozilla Public License Version
 5 * 1.1 (the "License"); you may not use this file except in compliance with
 6 * the License. You may obtain a copy of the License at
 7 * http://www.mozilla.org/MPL/
 8 *
 9 * Software distributed under the License is distributed on an "AS IS" basis,
10 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
11 * for the specific language governing rights and limitations under the
12 * License.
13 *
14 * The Original Code is the Netscape security libraries.
15 *
16 * The Initial Developer of the Original Code is
17 * Netscape Communications Corporation.
18 * Portions created by the Initial Developer are Copyright (C) 1994-2000
19 * the Initial Developer. All Rights Reserved.
20 *
21 * Contributor(s):
22 *
23 * Alternatively, the contents of this file may be used under the terms of
24 * either the GNU General Public License Version 2 or later (the "GPL"), or
25 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
26 * in which case the provisions of the GPL or the LGPL are applicable instead
27 * of those above. If you wish to allow use of your version of this file only
28 * under the terms of either the GPL or the LGPL, and not to allow others to
29 * use your version of this file under the terms of the MPL, indicate your
30 * decision by deleting the provisions above and replace them with the notice
31 * and other provisions required by the GPL or the LGPL. If you do not delete
32 * the provisions above, a recipient may use your version of this file under
33 * the terms of any one of the MPL, the GPL or the LGPL.
34 *
35 * ***** END LICENSE BLOCK ***** */
36
37#ifdef FREEBL_NO_DEPEND
38#include "stubs.h"
39#endif
40
41#include "seccomon.h"
42
43static size_t rng_systemFromNoise(unsigned char *dest, size_t maxLen);
44
45#if defined(XP_UNIX) || defined(XP_BEOS)
46#include "unix_rand.c"
47#endif
48#ifdef XP_WIN
49#include "win_rand.c"
50#endif
51#ifdef XP_OS2
52#include "os2_rand.c"
53#endif
54
55/*
56 * Normal RNG_SystemRNG() isn't available, use the system noise to collect
57 * the required amount of entropy.
58 */
59static size_t 
60rng_systemFromNoise(unsigned char *dest, size_t maxLen) 
61{
62   size_t retBytes = maxLen;
63
64   while (maxLen) {
65	size_t nbytes = RNG_GetNoise(dest, maxLen);
66
67	PORT_Assert(nbytes != 0);
68
69	dest += nbytes;
70	maxLen -= nbytes;
71
72	/* some hw op to try to introduce more entropy into the next
73	 * RNG_GetNoise call */
74	rng_systemJitter();
75   }
76   return retBytes;
77}
78