1 // Copyright 2013 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 #include "content/public/browser/media_device_id.h" 5 6 #include "base/logging.h" 7 #include "base/strings/string_number_conversions.h" 8 #include "base/strings/string_util.h" 9 #include "content/browser/browser_main_loop.h" 10 #include "content/browser/renderer_host/media/media_stream_manager.h" 11 #include "crypto/hmac.h" 12 13 namespace content { 14 15 std::string GetHMACForMediaDeviceID(const ResourceContext::SaltCallback& sc, 16 const GURL& security_origin, 17 const std::string& raw_unique_id) { 18 DCHECK(security_origin.is_valid()); 19 DCHECK(!raw_unique_id.empty()); 20 crypto::HMAC hmac(crypto::HMAC::SHA256); 21 const size_t digest_length = hmac.DigestLength(); 22 std::vector<uint8> digest(digest_length); 23 std::string salt = sc.Run(); 24 bool result = hmac.Init(security_origin.spec()) && 25 hmac.Sign(raw_unique_id + salt, &digest[0], digest.size()); 26 DCHECK(result); 27 return base::StringToLowerASCII(base::HexEncode(&digest[0], digest.size())); 28 } 29 30 bool DoesMediaDeviceIDMatchHMAC(const ResourceContext::SaltCallback& sc, 31 const GURL& security_origin, 32 const std::string& device_guid, 33 const std::string& raw_unique_id) { 34 DCHECK(security_origin.is_valid()); 35 DCHECK(!raw_unique_id.empty()); 36 std::string guid_from_raw_device_id = 37 GetHMACForMediaDeviceID(sc, security_origin, raw_unique_id); 38 return guid_from_raw_device_id == device_guid; 39 } 40 41 bool GetMediaDeviceIDForHMAC(MediaStreamType stream_type, 42 const ResourceContext::SaltCallback& rc, 43 const GURL& security_origin, 44 const std::string& source_id, 45 std::string* device_id) { 46 content::MediaStreamManager* manager = 47 content::BrowserMainLoop::GetInstance()->media_stream_manager(); 48 49 return manager->TranslateSourceIdToDeviceId( 50 content::MEDIA_DEVICE_VIDEO_CAPTURE, 51 rc, 52 security_origin, 53 source_id, 54 device_id); 55 } 56 57 } // namespace content 58
