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/* -*- 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
*
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* 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
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*
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* 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
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* Portions created by the Initial Developer are Copyright (C) 1999-2000
* the Initial Developer. All Rights Reserved.
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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#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;
size_t n = 0;
size_t 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;
}