291 lines
8.3 KiB
C
291 lines
8.3 KiB
C
/*
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*
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* Copyright(c) 2013-2017, 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 "auth.h"
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#include "alloc.h"
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#include "err.h" /* for srtp_debug */
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#include "auth_test_cases.h"
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#define NSS_PKCS11_2_0_COMPAT 1
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#include <nss.h>
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#include <pk11pub.h>
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#define SHA1_DIGEST_SIZE 20
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/* the debug module for authentiation */
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srtp_debug_module_t srtp_mod_hmac = {
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0, /* debugging is off by default */
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"hmac sha-1 nss" /* printable name for module */
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};
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typedef struct {
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NSSInitContext *nss;
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PK11SymKey *key;
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PK11Context *ctx;
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} srtp_hmac_nss_ctx_t;
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static srtp_err_status_t srtp_hmac_alloc(srtp_auth_t **a,
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int key_len,
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int out_len)
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{
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extern const srtp_auth_type_t srtp_hmac;
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srtp_hmac_nss_ctx_t *hmac;
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NSSInitContext *nss;
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debug_print(srtp_mod_hmac, "allocating auth func with key length %d",
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key_len);
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debug_print(srtp_mod_hmac, " tag length %d",
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out_len);
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/* check output length - should be less than 20 bytes */
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if (out_len > SHA1_DIGEST_SIZE) {
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return srtp_err_status_bad_param;
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}
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/* Initialize NSS equiv of NSS_NoDB_Init(NULL) */
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nss = NSS_InitContext("", "", "", "", NULL,
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NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
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NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
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NSS_INIT_OPTIMIZESPACE);
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if (!nss) {
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return srtp_err_status_auth_fail;
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}
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*a = (srtp_auth_t *)srtp_crypto_alloc(sizeof(srtp_auth_t));
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if (*a == NULL) {
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NSS_ShutdownContext(nss);
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return srtp_err_status_alloc_fail;
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}
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hmac =
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(srtp_hmac_nss_ctx_t *)srtp_crypto_alloc(sizeof(srtp_hmac_nss_ctx_t));
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if (hmac == NULL) {
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NSS_ShutdownContext(nss);
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srtp_crypto_free(*a);
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*a = NULL;
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return srtp_err_status_alloc_fail;
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}
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hmac->nss = nss;
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hmac->key = NULL;
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hmac->ctx = NULL;
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/* set pointers */
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(*a)->state = hmac;
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(*a)->type = &srtp_hmac;
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(*a)->out_len = out_len;
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(*a)->key_len = key_len;
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(*a)->prefix_len = 0;
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return srtp_err_status_ok;
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}
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static srtp_err_status_t srtp_hmac_dealloc(srtp_auth_t *a)
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{
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srtp_hmac_nss_ctx_t *hmac;
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hmac = (srtp_hmac_nss_ctx_t *)a->state;
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if (hmac) {
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/* free any PK11 values that have been created */
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if (hmac->key) {
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PK11_FreeSymKey(hmac->key);
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hmac->key = NULL;
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}
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if (hmac->ctx) {
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PK11_DestroyContext(hmac->ctx, PR_TRUE);
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hmac->ctx = NULL;
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}
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if (hmac->nss) {
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NSS_ShutdownContext(hmac->nss);
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hmac->nss = NULL;
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}
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/* zeroize everything */
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octet_string_set_to_zero(hmac, sizeof(srtp_hmac_nss_ctx_t));
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srtp_crypto_free(hmac);
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}
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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_hmac_start(void *statev)
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{
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srtp_hmac_nss_ctx_t *hmac;
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hmac = (srtp_hmac_nss_ctx_t *)statev;
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if (PK11_DigestBegin(hmac->ctx) != SECSuccess) {
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return srtp_err_status_auth_fail;
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}
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return srtp_err_status_ok;
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}
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static srtp_err_status_t srtp_hmac_init(void *statev,
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const uint8_t *key,
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int key_len)
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{
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srtp_hmac_nss_ctx_t *hmac;
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hmac = (srtp_hmac_nss_ctx_t *)statev;
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PK11SymKey *sym_key;
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PK11Context *ctx;
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if (hmac->ctx) {
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PK11_DestroyContext(hmac->ctx, PR_TRUE);
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hmac->ctx = NULL;
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}
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if (hmac->key) {
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PK11_FreeSymKey(hmac->key);
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hmac->key = NULL;
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}
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PK11SlotInfo *slot = PK11_GetBestSlot(CKM_SHA_1_HMAC, NULL);
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if (!slot) {
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return srtp_err_status_bad_param;
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}
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SECItem key_item = { siBuffer, (unsigned char *)key, key_len };
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sym_key = PK11_ImportSymKey(slot, CKM_SHA_1_HMAC, PK11_OriginUnwrap,
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CKA_SIGN, &key_item, NULL);
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PK11_FreeSlot(slot);
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if (!sym_key) {
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return srtp_err_status_auth_fail;
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}
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SECItem param_item = { siBuffer, NULL, 0 };
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ctx = PK11_CreateContextBySymKey(CKM_SHA_1_HMAC, CKA_SIGN, sym_key,
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¶m_item);
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if (!ctx) {
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PK11_FreeSymKey(sym_key);
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return srtp_err_status_auth_fail;
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}
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hmac->key = sym_key;
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hmac->ctx = ctx;
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return srtp_err_status_ok;
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}
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static srtp_err_status_t srtp_hmac_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_hmac_nss_ctx_t *hmac;
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hmac = (srtp_hmac_nss_ctx_t *)statev;
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debug_print(srtp_mod_hmac, "input: %s",
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srtp_octet_string_hex_string(message, msg_octets));
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if (PK11_DigestOp(hmac->ctx, message, msg_octets) != SECSuccess) {
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return srtp_err_status_auth_fail;
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}
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return srtp_err_status_ok;
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}
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static srtp_err_status_t srtp_hmac_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_hmac_nss_ctx_t *hmac;
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hmac = (srtp_hmac_nss_ctx_t *)statev;
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uint8_t hash_value[SHA1_DIGEST_SIZE];
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int i;
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unsigned int len;
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debug_print(srtp_mod_hmac, "input: %s",
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srtp_octet_string_hex_string(message, msg_octets));
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/* check tag length, return error if we can't provide the value expected */
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if (tag_len > SHA1_DIGEST_SIZE) {
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return srtp_err_status_bad_param;
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}
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if (PK11_DigestOp(hmac->ctx, message, msg_octets) != SECSuccess) {
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return srtp_err_status_auth_fail;
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}
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if (PK11_DigestFinal(hmac->ctx, hash_value, &len, SHA1_DIGEST_SIZE) !=
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SECSuccess) {
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return srtp_err_status_auth_fail;
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}
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if (tag_len < 0 || len < (unsigned int)tag_len)
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return srtp_err_status_auth_fail;
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/* copy hash_value to *result */
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for (i = 0; i < tag_len; i++) {
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result[i] = hash_value[i];
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}
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debug_print(srtp_mod_hmac, "output: %s",
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srtp_octet_string_hex_string(hash_value, tag_len));
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return srtp_err_status_ok;
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}
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static const char srtp_hmac_description[] =
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"hmac sha-1 authentication function";
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/*
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* srtp_auth_type_t hmac is the hmac metaobject
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*/
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const srtp_auth_type_t srtp_hmac = {
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srtp_hmac_alloc, /* */
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srtp_hmac_dealloc, /* */
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srtp_hmac_init, /* */
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srtp_hmac_compute, /* */
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srtp_hmac_update, /* */
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srtp_hmac_start, /* */
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srtp_hmac_description, /* */
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&srtp_hmac_test_case_0, /* */
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SRTP_HMAC_SHA1 /* */
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};
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