The Tor Browser: netwerk/srtp/src/crypto/replay/ut

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

     1 /*

     2  * ut_sim.c

     3  *

     4  * an unreliable transport simulator

     5  * (for testing replay databases and suchlike)

     6  *

     7  * David A. McGrew

     8  * Cisco Systems, Inc.

     9  */

    11 /*

    12  *

    13  * Copyright (c) 2001-2006, Cisco Systems, Inc.

    14  * All rights reserved.

    15  *

    16  * Redistribution and use in source and binary forms, with or without

    17  * modification, are permitted provided that the following conditions

    18  * are met:

    19  *

    20  *   Redistributions of source code must retain the above copyright

    21  *   notice, this list of conditions and the following disclaimer.

    22  *

    23  *   Redistributions in binary form must reproduce the above

    24  *   copyright notice, this list of conditions and the following

    25  *   disclaimer in the documentation and/or other materials provided

    26  *   with the distribution.

    27  *

    28  *   Neither the name of the Cisco Systems, Inc. nor the names of its

    29  *   contributors may be used to endorse or promote products derived

    30  *   from this software without specific prior written permission.

    31  *

    32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

    33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

    34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS

    35  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE

    36  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,

    37  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

    38  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR

    39  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

    40  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

    41  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

    42  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED

    43  * OF THE POSSIBILITY OF SUCH DAMAGE.

    44  *

    45  */

    48 #include "ut_sim.h"

    51 int

    52 ut_compar(const void *a, const void *b) {

    53   return rand() > (RAND_MAX/2) ? -1 : 1;

    54 }

    56 void

    57 ut_init(ut_connection *utc) {

    58   int i;

    59   utc->index = 0;

    61   for (i=0; i < UT_BUF; i++)

    62     utc->buffer[i] = i;

    64   qsort(utc->buffer, UT_BUF, sizeof(uint32_t), ut_compar);

    66   utc->index = UT_BUF - 1;

    67 }

    69 uint32_t

    70 ut_next_index(ut_connection *utc) {

    71   uint32_t tmp;

    73   tmp = utc->buffer[0];

    74   utc->index++;

    75   utc->buffer[0] = utc->index;

    77   qsort(utc->buffer, UT_BUF, sizeof(uint32_t), ut_compar);

    79   return tmp;

    80 }

    84 #ifdef UT_TEST

    86 #include <stdio.h>

    88 int

    89 main() {

    90   uint32_t i, irecvd, idiff;

    91   ut_connection utc;

    93   ut_init(&utc);

    95   for (i=0; i < 1000; i++) {

    96     irecvd = ut_next_index(&utc);

    97     idiff = i - irecvd;

    98     printf("%lu\t%lu\t%d\n", i, irecvd, idiff);

    99   }

   101   return 0;

   102 }

   105 #endif

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