зеркало из https://github.com/mozilla/gecko-dev.git
129 строки
4.2 KiB
C
129 строки
4.2 KiB
C
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.1 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1999 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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/*
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** Delete this section of the header after (if) agreement is reached to
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** provide the service suggested here. Move some parts of it, if
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** appropriate to platform specific implementation files.
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**
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** Proposal: Nothing in this header file should be construed as a
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** commitment on the part of the NSPR team, Netsacpe/AOL/Sun Alliance
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** et.al. to provide the API or function suggested in this header file.
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** This is a proposal, a draft, yadda. ... So, don't count on it.
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** lth. 29-Oct-1999
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**
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** --------------------------------------------------------------------
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**
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** Requirements, Discussion:
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**
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** Goal: foreach platform, find at least 160 bits of "good noise", that
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** is: from the platform itself, not extrapolated, stired, hashed,
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** xor'd, whatever, from a little available noise.
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**
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**
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** Required on the following platforms:
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** MAC, Win9x, WinNT, Solaris, Linux (k: 2.2.x).
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** Best effort on:
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** AIX, HP-UX.
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** Not required on:
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** Tru65 Unix (Compaq)
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**
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** Notes:
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**
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** I presume it is legal to put this function on Mozilla.org,
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** that it is not regulated as "cryptographic 'munitions'".
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**
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** Cartman says they need it 15-Jan-2000.
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**
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** --------------------------------------------------------------------
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*/
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/*
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** prrng.h -- NSPR Random Number Generator
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**
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**
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**
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**
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**
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** lth. 29-Oct-1999.
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*/
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#ifndef prrng_h___
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#define prrng_h___
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#include "prtypes.h"
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PR_BEGIN_EXTERN_C
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/*
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** PR_GetRandomNoise() -- Get random noise from the host platform
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**
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** Description:
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** PR_GetRandomNoise() provides, depending on platform, a random value.
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** The length of the random value is dependent on platform and the
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** platform's ability to provide a random value at that moment.
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**
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** The intent of PR_GetRandomNoise() is to provide a "seed" value for a
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** another random number generator that may be suitable for
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** cryptographic operations. This implies that the random value
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** provided may not be, by itself, cryptographically secure. The value
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** generated by PR_GetRandomNoise() is at best, extremely difficult to
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** predict and is as non-deterministic as the underlying platfrom can
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** provide.
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**
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** Inputs:
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** buf -- pointer to a caller supplied buffer to contain the
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** generated random number. buf must be at least as large as
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** is specified in the 'size' argument.
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**
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** size -- the requested size of the generated random number
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**
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** Outputs:
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** a random number provided in 'buf'.
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**
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** Returns:
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** PRSize value equal to the size of the random number actually
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** generated, or zero. The generated size may be less than the size
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** requested. A return value of zero means that PR_GetRandomNoise() is
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** not implemented on this platform, or there is no available noise
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** available to be returned at the time of the call.
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**
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** Restrictions:
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** Calls to PR_GetRandomNoise() may use a lot of CPU on some platforms.
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** Some platforms may block for up to a few seconds while they
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** accumulate some noise. Busy machines generate lots of noise, but
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** care is advised when using PR_GetRandomNoise() frequently in your
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** application.
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**
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** History:
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** Parts of the model dependent implementation for PR_GetRandomNoise()
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** were taken in whole or part from code previously in Netscape's NSS
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** component. There is no Goddamned Goverenment Munitions is this
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** code. Clinton: FOAD.
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**
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*/
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NSPR_API(PRSize) PR_GetRandomNoise(
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void *buf,
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PRSize size
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);
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PR_END_EXTERN_C
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#endif /* prrng_h___ */
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/* end prrng.h */
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