From 6bf0a5cb5034a7e684dcc3500e841785237ce2dd Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 19:32:43 +0200 Subject: Adding upstream version 1:115.7.0. Signed-off-by: Daniel Baumann --- third_party/libwebrtc/pc/external_hmac.cc | 143 ++++++++++++++++++++++++++++++ 1 file changed, 143 insertions(+) create mode 100644 third_party/libwebrtc/pc/external_hmac.cc (limited to 'third_party/libwebrtc/pc/external_hmac.cc') diff --git a/third_party/libwebrtc/pc/external_hmac.cc b/third_party/libwebrtc/pc/external_hmac.cc new file mode 100644 index 0000000000..27b5d0e5ab --- /dev/null +++ b/third_party/libwebrtc/pc/external_hmac.cc @@ -0,0 +1,143 @@ +/* + * Copyright 2014 The WebRTC project authors. All Rights Reserved. + * + * Use of this source code is governed by a BSD-style license + * that can be found in the LICENSE file in the root of the source + * tree. An additional intellectual property rights grant can be found + * in the file PATENTS. All contributing project authors may + * be found in the AUTHORS file in the root of the source tree. + */ + +#include "pc/external_hmac.h" + +#include // For malloc/free. +#include + +#include "rtc_base/logging.h" +#include "rtc_base/zero_memory.h" +#include "third_party/libsrtp/include/srtp.h" + +// Begin test case 0 */ +static const uint8_t kExternalHmacTestCase0Key[20] = { + 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, + 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b}; + +static const uint8_t kExternalHmacTestCase0Data[8] = { + 0x48, 0x69, 0x20, 0x54, 0x68, 0x65, 0x72, 0x65 // "Hi There" +}; + +static const uint8_t kExternalHmacFakeTag[10] = {0xba, 0xdd, 0xba, 0xdd, 0xba, + 0xdd, 0xba, 0xdd, 0xba, 0xdd}; + +static const srtp_auth_test_case_t kExternalHmacTestCase0 = { + 20, // Octets in key + const_cast(kExternalHmacTestCase0Key), // Key + 8, // Octets in data + const_cast(kExternalHmacTestCase0Data), // Data + 10, // Octets in tag + const_cast(kExternalHmacFakeTag), // Tag + NULL // Pointer to next + // testcase +}; + +static const char kExternalHmacDescription[] = + "external hmac sha-1 authentication"; + +// srtp_auth_type_t external_hmac is the hmac metaobject + +static const srtp_auth_type_t external_hmac = { + external_hmac_alloc, + external_hmac_dealloc, + external_hmac_init, + external_hmac_compute, + external_hmac_update, + external_hmac_start, + const_cast(kExternalHmacDescription), + const_cast(&kExternalHmacTestCase0), + EXTERNAL_HMAC_SHA1}; + +srtp_err_status_t external_hmac_alloc(srtp_auth_t** a, + int key_len, + int out_len) { + uint8_t* pointer; + + // Check key length - note that we don't support keys larger + // than 20 bytes yet + if (key_len > 20) + return srtp_err_status_bad_param; + + // Check output length - should be less than 20 bytes/ + if (out_len > 20) + return srtp_err_status_bad_param; + + // Allocate memory for auth and hmac_ctx_t structures. + pointer = new uint8_t[(sizeof(ExternalHmacContext) + sizeof(srtp_auth_t))]; + if (pointer == NULL) + return srtp_err_status_alloc_fail; + + // Set pointers + *a = reinterpret_cast(pointer); + // `external_hmac` is const and libsrtp expects `type` to be non-const. + // const conversion is required. `external_hmac` is constant because we don't + // want to increase global count in Chrome. + (*a)->type = const_cast(&external_hmac); + (*a)->state = pointer + sizeof(srtp_auth_t); + (*a)->out_len = out_len; + (*a)->key_len = key_len; + (*a)->prefix_len = 0; + + return srtp_err_status_ok; +} + +srtp_err_status_t external_hmac_dealloc(srtp_auth_t* a) { + rtc::ExplicitZeroMemory(a, sizeof(ExternalHmacContext) + sizeof(srtp_auth_t)); + + // Free memory + delete[] a; + + return srtp_err_status_ok; +} + +srtp_err_status_t external_hmac_init(void* state, + const uint8_t* key, + int key_len) { + if (key_len > HMAC_KEY_LENGTH) + return srtp_err_status_bad_param; + + ExternalHmacContext* context = static_cast(state); + memcpy(context->key, key, key_len); + context->key_length = key_len; + return srtp_err_status_ok; +} + +srtp_err_status_t external_hmac_start(void* /*state*/) { + return srtp_err_status_ok; +} + +srtp_err_status_t external_hmac_update(void* /*state*/, + const uint8_t* /*message*/, + int /*msg_octets*/) { + return srtp_err_status_ok; +} + +srtp_err_status_t external_hmac_compute(void* /*state*/, + const uint8_t* /*message*/, + int /*msg_octets*/, + int tag_len, + uint8_t* result) { + memcpy(result, kExternalHmacFakeTag, tag_len); + return srtp_err_status_ok; +} + +srtp_err_status_t external_crypto_init() { + // `external_hmac` is const. const_cast is required as libsrtp expects + // non-const. + srtp_err_status_t status = srtp_replace_auth_type( + const_cast(&external_hmac), EXTERNAL_HMAC_SHA1); + if (status) { + RTC_LOG(LS_ERROR) << "Error in replacing default auth module, error: " + << status; + return srtp_err_status_fail; + } + return srtp_err_status_ok; +} -- cgit v1.2.3