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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 "chrome/browser/extensions/api/music_manager_private/device_id.h"
#include "base/bind.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "content/public/browser/browser_thread.h"
#include "crypto/hmac.h"
namespace {
// Compute HMAC-SHA256(|key|, |text|) as a string.
bool ComputeHmacSha256(const std::string& key,
const std::string& text,
std::string* signature_return) {
crypto::HMAC hmac(crypto::HMAC::SHA256);
const size_t digest_length = hmac.DigestLength();
std::vector<uint8> digest(digest_length);
bool result = hmac.Init(key) &&
hmac.Sign(text, &digest[0], digest.size());
if (result) {
*signature_return = StringToLowerASCII(base::HexEncode(digest.data(),
digest.size()));
}
return result;
}
void GetMachineIdCallback(const std::string& extension_id,
const extensions::api::DeviceId::IdCallback& callback,
const std::string& machine_id) {
DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
if (machine_id.empty()) {
callback.Run("");
}
std::string device_id;
if (!ComputeHmacSha256(machine_id, extension_id, &device_id)) {
DLOG(ERROR) << "Error while computing HMAC-SHA256 of device id.";
callback.Run("");
}
callback.Run(device_id);
}
}
namespace extensions {
namespace api {
/* static */
void DeviceId::GetDeviceId(const std::string& extension_id,
const IdCallback& callback) {
DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
CHECK(!extension_id.empty());
// Forward call to platform specific implementation, then compute the HMAC
// in the callback.
GetMachineId(base::Bind(&GetMachineIdCallback, extension_id, callback));
}
} // namespace api
} // namespace extensions
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