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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/public/browser/media_device_id.h"
#include "base/logging.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "crypto/hmac.h"
namespace content {
std::string GetHMACForMediaDeviceID(const GURL& security_origin,
const std::string& raw_unique_id) {
DCHECK(security_origin.is_valid());
DCHECK(!raw_unique_id.empty());
crypto::HMAC hmac(crypto::HMAC::SHA256);
const size_t digest_length = hmac.DigestLength();
std::vector<uint8> digest(digest_length);
bool result = hmac.Init(security_origin.spec()) &&
hmac.Sign(raw_unique_id, &digest[0], digest.size());
DCHECK(result);
return StringToLowerASCII(base::HexEncode(&digest[0], digest.size()));
}
bool DoesMediaDeviceIDMatchHMAC(const GURL& security_origin,
const std::string& device_guid,
const std::string& raw_unique_id) {
DCHECK(security_origin.is_valid());
DCHECK(!raw_unique_id.empty());
std::string guid_from_raw_device_id =
GetHMACForMediaDeviceID(security_origin, raw_unique_id);
return guid_from_raw_device_id == device_guid;
}
} // namespace content
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