mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-10-31 22:25:30 +00:00
105 lines
3.6 KiB
C
105 lines
3.6 KiB
C
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/*
|
|
* 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 Portable Runtime (NSPR).
|
|
*
|
|
* The Initial Developer of the Original Code is Netscape
|
|
* Communications Corporation. Portions created by Netscape are
|
|
* Copyright (C) 1999-2000 Netscape Communications Corporation. All
|
|
* Rights Reserved.
|
|
*
|
|
* Contributor(s):
|
|
*
|
|
* Alternatively, the contents of this file may be used under the
|
|
* terms of the GNU General Public License Version 2 or later (the
|
|
* "GPL"), in which case the provisions of the GPL are applicable
|
|
* instead of those above. If you wish to allow use of your
|
|
* version of this file only under the terms of the GPL and not to
|
|
* allow others to use your version of this file under the MPL,
|
|
* indicate your decision by deleting the provisions above and
|
|
* replace them with the notice and other provisions required by
|
|
* the GPL. If you do not delete the provisions above, a recipient
|
|
* may use your version of this file under either the MPL or the
|
|
* GPL.
|
|
*/
|
|
|
|
|
|
/*
|
|
** prrng.h -- NSPR Random Number Generator
|
|
**
|
|
**
|
|
** lth. 29-Oct-1999.
|
|
*/
|
|
|
|
#ifndef prrng_h___
|
|
#define prrng_h___
|
|
|
|
#include "prtypes.h"
|
|
|
|
PR_BEGIN_EXTERN_C
|
|
|
|
/*
|
|
** PR_GetRandomNoise() -- Get random noise from the host platform
|
|
**
|
|
** Description:
|
|
** PR_GetRandomNoise() provides, depending on platform, a random value.
|
|
** The length of the random value is dependent on platform and the
|
|
** platform's ability to provide a random value at that moment.
|
|
**
|
|
** The intent of PR_GetRandomNoise() is to provide a "seed" value for a
|
|
** another random number generator that may be suitable for
|
|
** cryptographic operations. This implies that the random value
|
|
** provided may not be, by itself, cryptographically secure. The value
|
|
** generated by PR_GetRandomNoise() is at best, extremely difficult to
|
|
** predict and is as non-deterministic as the underlying platfrom can
|
|
** provide.
|
|
**
|
|
** Inputs:
|
|
** buf -- pointer to a caller supplied buffer to contain the
|
|
** generated random number. buf must be at least as large as
|
|
** is specified in the 'size' argument.
|
|
**
|
|
** size -- the requested size of the generated random number
|
|
**
|
|
** Outputs:
|
|
** a random number provided in 'buf'.
|
|
**
|
|
** Returns:
|
|
** PRSize value equal to the size of the random number actually
|
|
** generated, or zero. The generated size may be less than the size
|
|
** requested. A return value of zero means that PR_GetRandomNoise() is
|
|
** not implemented on this platform, or there is no available noise
|
|
** available to be returned at the time of the call.
|
|
**
|
|
** Restrictions:
|
|
** Calls to PR_GetRandomNoise() may use a lot of CPU on some platforms.
|
|
** Some platforms may block for up to a few seconds while they
|
|
** accumulate some noise. Busy machines generate lots of noise, but
|
|
** care is advised when using PR_GetRandomNoise() frequently in your
|
|
** application.
|
|
**
|
|
** History:
|
|
** Parts of the model dependent implementation for PR_GetRandomNoise()
|
|
** were taken in whole or part from code previously in Netscape's NSS
|
|
** component.
|
|
**
|
|
*/
|
|
NSPR_API(PRSize) PR_GetRandomNoise(
|
|
void *buf,
|
|
PRSize size
|
|
);
|
|
|
|
PR_END_EXTERN_C
|
|
|
|
#endif /* prrng_h___ */
|
|
/* end prrng.h */
|