Coverage Report

Created: 2023-03-25 06:03

/src/libsrtp/crypto/hash/null_auth.c
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/*
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 * null_auth.c
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 *
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 * implements the do-nothing auth algorithm
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 *
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 * David A. McGrew
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 * Cisco Systems, Inc.
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 *
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 */
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/*
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 *
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 * Copyright (c) 2001-2017, Cisco Systems, Inc.
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 *   Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 *
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 *   Redistributions in binary form must reproduce the above
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 *   copyright notice, this list of conditions and the following
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 *   disclaimer in the documentation and/or other materials provided
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 *   with the distribution.
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 *
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 *   Neither the name of the Cisco Systems, Inc. nor the names of its
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 *   contributors may be used to endorse or promote products derived
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 *   from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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 * OF THE POSSIBILITY OF SUCH DAMAGE.
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 *
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 */
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include "null_auth.h"
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#include "err.h" /* for srtp_debug */
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#include "alloc.h"
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#include "cipher_types.h"
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static srtp_err_status_t srtp_null_auth_alloc(srtp_auth_t **a,
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                                              int key_len,
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                                              int out_len)
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7.55k
{
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    extern const srtp_auth_type_t srtp_null_auth;
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7.55k
    uint8_t *pointer;
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    debug_print(srtp_mod_auth, "allocating auth func with key length %d",
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                key_len);
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    debug_print(srtp_mod_auth, "                          tag length %d",
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                out_len);
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    /* allocate memory for auth and srtp_null_auth_ctx_t structures */
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    pointer = (uint8_t *)srtp_crypto_alloc(sizeof(srtp_null_auth_ctx_t) +
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7.55k
                                           sizeof(srtp_auth_t));
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    if (pointer == NULL) {
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0
        return srtp_err_status_alloc_fail;
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0
    }
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    /* set pointers */
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    *a = (srtp_auth_t *)pointer;
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    (*a)->type = &srtp_null_auth;
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    (*a)->state = pointer + sizeof(srtp_auth_t);
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    (*a)->out_len = out_len;
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    (*a)->prefix_len = out_len;
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    (*a)->key_len = key_len;
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    return srtp_err_status_ok;
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}
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static srtp_err_status_t srtp_null_auth_dealloc(srtp_auth_t *a)
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{
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    extern const srtp_auth_type_t srtp_null_auth;
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    /* zeroize entire state*/
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    octet_string_set_to_zero(a, sizeof(srtp_null_auth_ctx_t) +
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7.55k
                                    sizeof(srtp_auth_t));
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    /* free memory */
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    srtp_crypto_free(a);
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    return srtp_err_status_ok;
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}
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static srtp_err_status_t srtp_null_auth_init(void *statev,
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                                             const uint8_t *key,
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                                             int key_len)
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7.35k
{
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    /* srtp_null_auth_ctx_t *state = (srtp_null_auth_ctx_t *)statev; */
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    (void)statev;
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    (void)key;
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    (void)key_len;
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    /* accept any length of key, and do nothing */
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    return srtp_err_status_ok;
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}
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static srtp_err_status_t srtp_null_auth_compute(void *statev,
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                                                const uint8_t *message,
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                                                int msg_octets,
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                                                int tag_len,
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                                                uint8_t *result)
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{
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    /* srtp_null_auth_ctx_t *state = (srtp_null_auth_ctx_t *)statev; */
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    (void)statev;
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    (void)message;
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    (void)msg_octets;
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    (void)tag_len;
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    (void)result;
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    return srtp_err_status_ok;
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}
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static srtp_err_status_t srtp_null_auth_update(void *statev,
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                                               const uint8_t *message,
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                                               int msg_octets)
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{
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    /* srtp_null_auth_ctx_t *state = (srtp_null_auth_ctx_t *)statev; */
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    (void)statev;
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    (void)message;
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    (void)msg_octets;
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    return srtp_err_status_ok;
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}
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static srtp_err_status_t srtp_null_auth_start(void *statev)
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11.5k
{
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    /* srtp_null_auth_ctx_t *state = (srtp_null_auth_ctx_t *)statev; */
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    (void)statev;
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    return srtp_err_status_ok;
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}
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/*
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 * srtp_auth_type_t - defines description, test case, and null_auth
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 * metaobject
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 */
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/* begin test case 0 */
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static const srtp_auth_test_case_t srtp_null_auth_test_case_0 = {
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    0,    /* octets in key            */
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    NULL, /* key                      */
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    0,    /* octets in data           */
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    NULL, /* data                     */
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    0,    /* octets in tag            */
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    NULL, /* tag                      */
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    NULL  /* pointer to next testcase */
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};
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/* end test case 0 */
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static const char srtp_null_auth_description[] = "null authentication function";
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const srtp_auth_type_t srtp_null_auth = {
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    srtp_null_auth_alloc,        /* */
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    srtp_null_auth_dealloc,      /* */
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    srtp_null_auth_init,         /* */
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    srtp_null_auth_compute,      /* */
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    srtp_null_auth_update,       /* */
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    srtp_null_auth_start,        /* */
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    srtp_null_auth_description,  /* */
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    &srtp_null_auth_test_case_0, /* */
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    SRTP_NULL_AUTH               /* */
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};