tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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CDMStorageIdProvider.cpp (2078B)

      1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* This Source Code Form is subject to the terms of the Mozilla Public
      3 * License, v. 2.0. If a copy of the MPL was not distributed with this
      4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      5 
      6 #include "CDMStorageIdProvider.h"
      7 
      8 #include "GMPLog.h"
      9 #include "mozilla/IntegerPrintfMacros.h"
     10 #include "nsCOMPtr.h"
     11 #include "nsICryptoHash.h"
     12 
     13 #ifdef SUPPORT_STORAGE_ID
     14 #  include "rlz/lib/machine_id.h"
     15 #endif
     16 
     17 namespace mozilla {
     18 
     19 /*static*/
     20 nsCString CDMStorageIdProvider::ComputeStorageId(const nsCString& aOriginSalt) {
     21 #ifndef SUPPORT_STORAGE_ID
     22  return ""_ns;
     23 #else
     24  GMP_LOG_DEBUG("CDMStorageIdProvider::ComputeStorageId");
     25 
     26  std::string machineId;
     27  if (!rlz_lib::GetMachineId(&machineId)) {
     28    GMP_LOG_DEBUG(
     29        "CDMStorageIdProvider::ComputeStorageId: get machineId failed.");
     30    return ""_ns;
     31  }
     32 
     33  std::string originSalt(aOriginSalt.BeginReading(), aOriginSalt.Length());
     34  std::string input =
     35      machineId + originSalt + CDMStorageIdProvider::kBrowserIdentifier;
     36  nsCOMPtr<nsICryptoHash> hasher;
     37  nsresult rv = NS_NewCryptoHash(nsICryptoHash::SHA256, getter_AddRefs(hasher));
     38  if (NS_WARN_IF(NS_FAILED(rv))) {
     39    GMP_LOG_DEBUG(
     40        "CDMStorageIdProvider::ComputeStorageId: failed to initialize "
     41        "hash(0x%08" PRIx32 ")",
     42        static_cast<uint32_t>(rv));
     43    return ""_ns;
     44  }
     45 
     46  rv = hasher->Update(reinterpret_cast<const uint8_t*>(input.c_str()),
     47                      input.size());
     48  if (NS_WARN_IF(NS_FAILED(rv))) {
     49    GMP_LOG_DEBUG(
     50        "CDMStorageIdProvider::ComputeStorageId: failed to update "
     51        "hash(0x%08" PRIx32 ")",
     52        static_cast<uint32_t>(rv));
     53    return ""_ns;
     54  }
     55 
     56  nsCString storageId;
     57  rv = hasher->Finish(false, storageId);
     58  if (NS_WARN_IF(NS_FAILED(rv))) {
     59    GMP_LOG_DEBUG(
     60        "CDMStorageIdProvider::ComputeStorageId: failed to get the final hash "
     61        "result(0x%08" PRIx32 ")",
     62        static_cast<uint32_t>(rv));
     63    return ""_ns;
     64  }
     65  return storageId;
     66 #endif
     67 }
     68 
     69 }  // namespace mozilla