The Tor Browser: netwerk/srtp/src/crypto/hash/null

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

     1 /*

     2  * null_auth.c

     3  *

     4  * implements the do-nothing auth algorithm

     5  *

     6  * David A. McGrew

     7  * Cisco Systems, Inc.

     8  *

     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 "null_auth.h"

    49 #include "alloc.h"

    51 /* null_auth uses the auth debug module */

    53 extern debug_module_t mod_auth;

    55 err_status_t

    56 null_auth_alloc(auth_t **a, int key_len, int out_len) {

    57   extern auth_type_t null_auth;

    58   uint8_t *pointer;

    60   debug_print(mod_auth, "allocating auth func with key length %d", key_len);

    61   debug_print(mod_auth, "                          tag length %d", out_len);

    63   /* allocate memory for auth and null_auth_ctx_t structures */

    64   pointer = (uint8_t*)crypto_alloc(sizeof(null_auth_ctx_t) + sizeof(auth_t));

    65   if (pointer == NULL)

    66     return err_status_alloc_fail;

    68   /* set pointers */

    69   *a = (auth_t *)pointer;

    70   (*a)->type = &null_auth;

    71   (*a)->state = pointer + sizeof (auth_t);

    72   (*a)->out_len = out_len;

    73   (*a)->prefix_len = out_len;

    74   (*a)->key_len = key_len;

    76   /* increment global count of all null_auth uses */

    77   null_auth.ref_count++;

    79   return err_status_ok;

    80 }

    82 err_status_t

    83 null_auth_dealloc(auth_t *a) {

    84   extern auth_type_t null_auth;

    86   /* zeroize entire state*/

    87   octet_string_set_to_zero((uint8_t *)a,

    88 			   sizeof(null_auth_ctx_t) + sizeof(auth_t));

    90   /* free memory */

    91   crypto_free(a);

    93   /* decrement global count of all null_auth uses */

    94   null_auth.ref_count--;

    96   return err_status_ok;

    97 }

    99 err_status_t

   100 null_auth_init(null_auth_ctx_t *state, const uint8_t *key, int key_len) {

   102   /* accept any length of key, and do nothing */

   104   return err_status_ok;

   105 }

   107 err_status_t

   108 null_auth_compute(null_auth_ctx_t *state, uint8_t *message,

   109 		   int msg_octets, int tag_len, uint8_t *result) {

   111   return err_status_ok;

   112 }

   114 err_status_t

   115 null_auth_update(null_auth_ctx_t *state, uint8_t *message,

   116 		   int msg_octets) {

   118   return err_status_ok;

   119 }

   121 err_status_t

   122 null_auth_start(null_auth_ctx_t *state) {

   123   return err_status_ok;

   124 }

   126 /*

   127  * auth_type_t - defines description, test case, and null_auth

   128  * metaobject

   129  */

   131 /* begin test case 0 */

   133 auth_test_case_t

   134 null_auth_test_case_0 = {

   135   0,                                       /* octets in key            */

   136   NULL,                                    /* key                      */

   137   0,                                       /* octets in data           */

   138   NULL,                                    /* data                     */

   139   0,                                       /* octets in tag            */

   140   NULL,                                    /* tag                      */

   141   NULL                                     /* pointer to next testcase */

   142 };

   144 /* end test case 0 */

   146 char null_auth_description[] = "null authentication function";

   148 auth_type_t

   149 null_auth  = {

   150   (auth_alloc_func)      null_auth_alloc,

   151   (auth_dealloc_func)    null_auth_dealloc,

   152   (auth_init_func)       null_auth_init,

   153   (auth_compute_func)    null_auth_compute,

   154   (auth_update_func)     null_auth_update,

   155   (auth_start_func)      null_auth_start,

   156   (char *)               null_auth_description,

   157   (int)                  0,  /* instance count */

   158   (auth_test_case_t *)   &null_auth_test_case_0,

   159   (debug_module_t *)     NULL,

   160   (auth_type_id_t)       NULL_AUTH

   161 };

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