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

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2015-10-21 05:03:22 +02:00
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is the Netscape security libraries.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1994-2000
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifdef FREEBL_NO_DEPEND
#include "stubs.h"
#endif
#include "seccomon.h"
static size_t rng_systemFromNoise(unsigned char *dest, size_t maxLen);
#if defined(XP_UNIX) || defined(XP_BEOS)
#include "unix_rand.c"
#endif
#ifdef XP_WIN
#include "win_rand.c"
#endif
#ifdef XP_OS2
#include "os2_rand.c"
#endif
/*
* Normal RNG_SystemRNG() isn't available, use the system noise to collect
* the required amount of entropy.
*/
static size_t
rng_systemFromNoise(unsigned char *dest, size_t maxLen)
{
size_t retBytes = maxLen;
while (maxLen) {
size_t nbytes = RNG_GetNoise(dest, maxLen);
PORT_Assert(nbytes != 0);
dest += nbytes;
maxLen -= nbytes;
/* some hw op to try to introduce more entropy into the next
* RNG_GetNoise call */
rng_systemJitter();
}
return retBytes;
}