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os2rng.c
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00001 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
00003  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00004  *
00005  * The contents of this file are subject to the Mozilla Public License Version
00006  * 1.1 (the "License"); you may not use this file except in compliance with
00007  * the License. You may obtain a copy of the License at
00008  * http://www.mozilla.org/MPL/
00009  *
00010  * Software distributed under the License is distributed on an "AS IS" basis,
00011  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00012  * for the specific language governing rights and limitations under the
00013  * License.
00014  *
00015  * The Original Code is the Netscape Portable Runtime (NSPR).
00016  *
00017  * The Initial Developer of the Original Code is
00018  * Netscape Communications Corporation.
00019  * Portions created by the Initial Developer are Copyright (C) 1999-2000
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *
00024  * Alternatively, the contents of this file may be used under the terms of
00025  * either the GNU General Public License Version 2 or later (the "GPL"), or
00026  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00027  * in which case the provisions of the GPL or the LGPL are applicable instead
00028  * of those above. If you wish to allow use of your version of this file only
00029  * under the terms of either the GPL or the LGPL, and not to allow others to
00030  * use your version of this file under the terms of the MPL, indicate your
00031  * decision by deleting the provisions above and replace them with the notice
00032  * and other provisions required by the GPL or the LGPL. If you do not delete
00033  * the provisions above, a recipient may use your version of this file under
00034  * the terms of any one of the MPL, the GPL or the LGPL.
00035  *
00036  * ***** END LICENSE BLOCK ***** */
00037 
00038 
00039 #define INCL_DOS
00040 #define INCL_DOSERRORS
00041 #include <os2.h>
00042 #include <stdlib.h>
00043 #include <time.h>
00044 #include "primpl.h"
00045 
00046 static BOOL clockTickTime(unsigned long *phigh, unsigned long *plow)
00047 {
00048     APIRET rc = NO_ERROR;
00049     QWORD qword = {0,0};
00050 
00051     rc = DosTmrQueryTime(&qword);
00052     if (rc != NO_ERROR)
00053        return FALSE;
00054 
00055     *phigh = qword.ulHi;
00056     *plow  = qword.ulLo;
00057 
00058     return TRUE;
00059 }
00060 
00061 extern PRSize _PR_MD_GetRandomNoise(void *buf, PRSize size )
00062 {
00063     unsigned long high = 0;
00064     unsigned long low  = 0;
00065     clock_t val = 0;
00066     int n = 0;
00067     int nBytes = 0;
00068     time_t sTime;
00069 
00070     if (size <= 0)
00071        return 0;
00072 
00073     clockTickTime(&high, &low);
00074 
00075     /* get the maximally changing bits first */
00076     nBytes = sizeof(low) > size ? size : sizeof(low);
00077     memcpy(buf, &low, nBytes);
00078     n += nBytes;
00079     size -= nBytes;
00080 
00081     if (size <= 0)
00082        return n;
00083 
00084     nBytes = sizeof(high) > size ? size : sizeof(high);
00085     memcpy(((char *)buf) + n, &high, nBytes);
00086     n += nBytes;
00087     size -= nBytes;
00088 
00089     if (size <= 0)
00090        return n;
00091 
00092     /* get the number of milliseconds that have elapsed since application started */
00093     val = clock();
00094 
00095     nBytes = sizeof(val) > size ? size : sizeof(val);
00096     memcpy(((char *)buf) + n, &val, nBytes);
00097     n += nBytes;
00098     size -= nBytes;
00099 
00100     if (size <= 0)
00101        return n;
00102 
00103     /* get the time in seconds since midnight Jan 1, 1970 */
00104     time(&sTime);
00105     nBytes = sizeof(sTime) > size ? size : sizeof(sTime);
00106     memcpy(((char *)buf) + n, &sTime, nBytes);
00107     n += nBytes;
00108 
00109     return n;
00110 }