The Tor Browser: netwerk/srtp/src/crypto/hash/auth.c@6474c204b198 (annotated)

netwerk/srtp/src/crypto/hash/auth.c@6474c204b198 (annotated)

netwerk/srtp/src/crypto/hash/auth.c

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

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

 /*
  * auth.c
  *
  * some bookkeeping functions for authentication functions
  *
  * David A. McGrew
  * Cisco Systems, Inc.
  */
 /*
  *
  * Copyright (c) 2001-2006, Cisco Systems, Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  *   Redistributions of source code must retain the above copyright
  *   notice, this list of conditions and the following disclaimer.
  *
  *   Redistributions in binary form must reproduce the above
  *   copyright notice, this list of conditions and the following
  *   disclaimer in the documentation and/or other materials provided
  *   with the distribution.
  *
  *   Neither the name of the Cisco Systems, Inc. nor the names of its
  *   contributors may be used to endorse or promote products derived
  *   from this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  * OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  */
 #include "auth.h"
 /* the debug module for authentiation */
 debug_module_t mod_auth = {
 ,                  /* debugging is off by default */
   "auth func"         /* printable name for module   */
 };
 int
 auth_get_key_length(const auth_t *a) {
   return a->key_len;
 }
 int
 auth_get_tag_length(const auth_t *a) {
   return a->out_len;
 }
 int
 auth_get_prefix_length(const auth_t *a) {
   return a->prefix_len;
 }
 int
 auth_type_get_ref_count(const auth_type_t *at) {
   return at->ref_count;
 }
 /*
  * auth_type_test() tests an auth function of type ct against
  * test cases provided in a list test_data of values of key, data, and tag
  * that is known to be good
  */
 /* should be big enough for most occasions */
 #define SELF_TEST_TAG_BUF_OCTETS 32
 err_status_t
 auth_type_test(const auth_type_t *at, const auth_test_case_t *test_data) {
   const auth_test_case_t *test_case = test_data;
   auth_t *a;
   err_status_t status;
   uint8_t tag[SELF_TEST_TAG_BUF_OCTETS];
   int i, case_num = 0;
   debug_print(mod_auth, "running self-test for auth function %s",
 	      at->description);
   /*
    * check to make sure that we have at least one test case, and
    * return an error if we don't - we need to be paranoid here
    */
   if (test_case == NULL)
     return err_status_cant_check;
   /* loop over all test cases */
   while (test_case != NULL) {
     /* check test case parameters */
     if (test_case->tag_length_octets > SELF_TEST_TAG_BUF_OCTETS)
       return err_status_bad_param;
     /* allocate auth */
     status = auth_type_alloc(at, &a, test_case->key_length_octets,
 			     test_case->tag_length_octets);
     if (status)
       return status;
     /* initialize auth */
     status = auth_init(a, test_case->key);
     if (status) {
       auth_dealloc(a);
       return status;
     }
     /* zeroize tag then compute */
     octet_string_set_to_zero(tag, test_case->tag_length_octets);
     status = auth_compute(a, test_case->data,
 			  test_case->data_length_octets, tag);
     if (status) {
       auth_dealloc(a);
       return status;
     }
     debug_print(mod_auth, "key: %s",
 		octet_string_hex_string(test_case->key,
 					test_case->key_length_octets));
     debug_print(mod_auth, "data: %s",
 		octet_string_hex_string(test_case->data,
 				   test_case->data_length_octets));
     debug_print(mod_auth, "tag computed: %s",
 	   octet_string_hex_string(tag, test_case->tag_length_octets));
     debug_print(mod_auth, "tag expected: %s",
 	   octet_string_hex_string(test_case->tag,
 				   test_case->tag_length_octets));
     /* check the result */
     status = err_status_ok;
     for (i=0; i < test_case->tag_length_octets; i++)
       if (tag[i] != test_case->tag[i]) {
 	status = err_status_algo_fail;
 	debug_print(mod_auth, "test case %d failed", case_num);
 	debug_print(mod_auth, "  (mismatch at octet %d)", i);
       }
     if (status) {
       auth_dealloc(a);
       return err_status_algo_fail;
     }
     /* deallocate the auth function */
     status = auth_dealloc(a);
     if (status)
       return status;
     /*
      * the auth function passed the test case, so move on to the next test
      * case in the list; if NULL, we'll quit and return an OK
      */
     test_case = test_case->next_test_case;
     ++case_num;
   }
   return err_status_ok;
 }
 /*
  * auth_type_self_test(at) performs auth_type_test on at's internal
  * list of test data.
  */
 err_status_t
 auth_type_self_test(const auth_type_t *at) {
   return auth_type_test(at, at->test_data);
 }

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netwerk/srtp/src/crypto/hash/auth.c@6474c204b198 (annotated)

netwerk/srtp/src/crypto/hash/auth.c