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w32rng.c

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** 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 Portable Runtime (NSPR).
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1999-2000
 * 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
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 * 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
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 * ***** END LICENSE BLOCK ***** */

#include <windows.h>
#include <time.h>
#include <io.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <primpl.h>

static BOOL
CurrentClockTickTime(LPDWORD lpdwHigh, LPDWORD lpdwLow)
{
    LARGE_INTEGER   liCount;

    if (!QueryPerformanceCounter(&liCount))
        return FALSE;

    *lpdwHigh = liCount.u.HighPart;
    *lpdwLow = liCount.u.LowPart;
    return TRUE;
}

extern PRSize _PR_MD_GetRandomNoise( void *buf, PRSize size )
{
    DWORD   dwHigh, dwLow, dwVal;
    int     n = 0;
    int     nBytes;
    time_t  sTime;

    if (size <= 0)
        return 0;

    CurrentClockTickTime(&dwHigh, &dwLow);

    // get the maximally changing bits first
    nBytes = sizeof(dwLow) > size ? size : sizeof(dwLow);
    memcpy((char *)buf, &dwLow, nBytes);
    n += nBytes;
    size -= nBytes;

    if (size <= 0)
        return n;

    nBytes = sizeof(dwHigh) > size ? size : sizeof(dwHigh);
    memcpy(((char *)buf) + n, &dwHigh, nBytes);
    n += nBytes;
    size -= nBytes;

    if (size <= 0)
        return n;

    // get the number of milliseconds that have elapsed since Windows started
    dwVal = GetTickCount();

    nBytes = sizeof(dwVal) > size ? size : sizeof(dwVal);
    memcpy(((char *)buf) + n, &dwVal, nBytes);
    n += nBytes;
    size -= nBytes;

    if (size <= 0)
        return n;

    // get the time in seconds since midnight Jan 1, 1970
    time(&sTime);
    nBytes = sizeof(sTime) > size ? size : sizeof(sTime);
    memcpy(((char *)buf) + n, &sTime, nBytes);
    n += nBytes;

    return n;
}


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