The Tor Browser: nsprpub/pr/src/md/os2/os2rng.c@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     7 #define INCL_DOS

     8 #define INCL_DOSERRORS

     9 #include <os2.h>

    10 #include <stdlib.h>

    11 #include <time.h>

    12 #include "primpl.h"

    14 static BOOL clockTickTime(unsigned long *phigh, unsigned long *plow)

    15 {

    16     APIRET rc = NO_ERROR;

    17     QWORD qword = {0,0};

    19     rc = DosTmrQueryTime(&qword);

    20     if (rc != NO_ERROR)

    21        return FALSE;

    23     *phigh = qword.ulHi;

    24     *plow  = qword.ulLo;

    26     return TRUE;

    27 }

    29 extern PRSize _PR_MD_GetRandomNoise(void *buf, PRSize size )

    30 {

    31     unsigned long high = 0;

    32     unsigned long low  = 0;

    33     clock_t val = 0;

    34     int n = 0;

    35     int nBytes = 0;

    36     time_t sTime;

    38     if (size <= 0)

    39        return 0;

    41     clockTickTime(&high, &low);

    43     /* get the maximally changing bits first */

    44     nBytes = sizeof(low) > size ? size : sizeof(low);

    45     memcpy(buf, &low, nBytes);

    46     n += nBytes;

    47     size -= nBytes;

    49     if (size <= 0)

    50        return n;

    52     nBytes = sizeof(high) > size ? size : sizeof(high);

    53     memcpy(((char *)buf) + n, &high, nBytes);

    54     n += nBytes;

    55     size -= nBytes;

    57     if (size <= 0)

    58        return n;

    60     /* get the number of milliseconds that have elapsed since application started */

    61     val = clock();

    63     nBytes = sizeof(val) > size ? size : sizeof(val);

    64     memcpy(((char *)buf) + n, &val, nBytes);

    65     n += nBytes;

    66     size -= nBytes;

    68     if (size <= 0)

    69        return n;

    71     /* get the time in seconds since midnight Jan 1, 1970 */

    72     time(&sTime);

    73     nBytes = sizeof(sTime) > size ? size : sizeof(sTime);

    74     memcpy(((char *)buf) + n, &sTime, nBytes);

    75     n += nBytes;

    77     return n;

    78 }

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