161 lines
5.1 KiB
C++
161 lines
5.1 KiB
C++
/*
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* Copyright 2014 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#if defined(HAVE_SRTP) && defined(ENABLE_EXTERNAL_AUTH)
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#include "webrtc/pc/externalhmac.h"
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#include <stdlib.h> // For malloc/free.
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extern "C" {
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#ifdef SRTP_RELATIVE_PATH
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#include "crypto_kernel.h" // NOLINT
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#include "srtp.h" // NOLINT
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#else
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#include "third_party/libsrtp/srtp/crypto/include/crypto_kernel.h"
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#include "third_party/libsrtp/srtp/include/srtp.h"
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#endif // SRTP_RELATIVE_PATH
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}
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#include "webrtc/base/logging.h"
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// Begin test case 0 */
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static const uint8_t kExternalHmacTestCase0Key[20] = {
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0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b,
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0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b,
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0x0b, 0x0b, 0x0b, 0x0b
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};
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static const uint8_t kExternalHmacTestCase0Data[8] = {
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0x48, 0x69, 0x20, 0x54, 0x68, 0x65, 0x72, 0x65 // "Hi There"
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};
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static const uint8_t kExternalHmacFakeTag[10] = {
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0xba, 0xdd, 0xba, 0xdd, 0xba, 0xdd, 0xba, 0xdd, 0xba, 0xdd
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};
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static const auth_test_case_t kExternalHmacTestCase0 = {
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20, // Octets in key
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const_cast<uint8_t*>(kExternalHmacTestCase0Key), // Key
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8, // Octets in data
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const_cast<uint8_t*>(kExternalHmacTestCase0Data), // Data
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10, // Octets in tag
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const_cast<uint8_t*>(kExternalHmacFakeTag), // Tag
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NULL // Pointer to next
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// testcase
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};
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static const char kExternalHmacDescription[] =
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"external hmac sha-1 authentication";
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// auth_type_t external_hmac is the hmac metaobject
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static const auth_type_t external_hmac = {
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external_hmac_alloc,
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external_hmac_dealloc,
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(auth_init_func) external_hmac_init,
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(auth_compute_func) external_hmac_compute,
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(auth_update_func) external_hmac_update,
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(auth_start_func) external_hmac_start,
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const_cast<char*>(kExternalHmacDescription),
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0, // Instance count.
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const_cast<auth_test_case_t*>(&kExternalHmacTestCase0),
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NULL, // No debugging module.
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EXTERNAL_HMAC_SHA1
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};
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err_status_t external_hmac_alloc(auth_t** a, int key_len, int out_len) {
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uint8_t* pointer;
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// Check key length - note that we don't support keys larger
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// than 20 bytes yet
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if (key_len > 20)
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return err_status_bad_param;
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// Check output length - should be less than 20 bytes/
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if (out_len > 20)
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return err_status_bad_param;
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// Allocate memory for auth and hmac_ctx_t structures.
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pointer = new uint8_t[(sizeof(ExternalHmacContext) + sizeof(auth_t))];
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if (pointer == NULL)
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return err_status_alloc_fail;
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// Set pointers
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*a = (auth_t *)pointer;
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// |external_hmac| is const and libsrtp expects |type| to be non-const.
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// const conversion is required. |external_hmac| is constant because we don't
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// want to increase global count in Chrome.
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(*a)->type = const_cast<auth_type_t*>(&external_hmac);
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(*a)->state = pointer + sizeof(auth_t);
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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 err_status_ok;
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}
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err_status_t external_hmac_dealloc(auth_t* a) {
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// Zeroize entire state
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memset((uint8_t *)a, 0, sizeof(ExternalHmacContext) + sizeof(auth_t));
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// Free memory
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delete[] a;
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return err_status_ok;
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}
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err_status_t external_hmac_init(ExternalHmacContext* state,
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const uint8_t* key,
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int key_len) {
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if (key_len > HMAC_KEY_LENGTH)
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return err_status_bad_param;
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memset(state->key, 0, key_len);
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memcpy(state->key, key, key_len);
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state->key_length = key_len;
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return err_status_ok;
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}
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err_status_t external_hmac_start(ExternalHmacContext* state) {
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return err_status_ok;
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}
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err_status_t external_hmac_update(ExternalHmacContext* state,
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const uint8_t* message,
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int msg_octets) {
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return err_status_ok;
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}
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err_status_t external_hmac_compute(ExternalHmacContext* state,
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const void* 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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memcpy(result, kExternalHmacFakeTag, tag_len);
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return err_status_ok;
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}
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err_status_t external_crypto_init() {
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// |external_hmac| is const. const_cast is required as libsrtp expects
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// non-const.
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err_status_t status = crypto_kernel_replace_auth_type(
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const_cast<auth_type_t*>(&external_hmac), EXTERNAL_HMAC_SHA1);
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if (status) {
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LOG(LS_ERROR) << "Error in replacing default auth module, error: "
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<< status;
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return err_status_fail;
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}
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return err_status_ok;
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}
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#endif // defined(HAVE_SRTP) && defined(ENABLE_EXTERNAL_AUTH)
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