CryptAuth: Add GetId() and a GetTruncatedIdForLogs() functions to RemoteDevice.

components/cryptauth/remote_device.cc

 // Copyright 2015 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 "components/cryptauth/remote_device.h"
 
+#include "base/base64.h"
+
 namespace cryptauth {
 
 RemoteDevice::RemoteDevice() : bluetooth_type(BLUETOOTH_CLASSIC) {}
 
 RemoteDevice::RemoteDevice(const std::string& user_id,
                            const std::string& name,
                            const std::string& public_key,
                            BluetoothType bluetooth_type,
                            const std::string& bluetooth_address,
                            const std::string& persistent_symmetric_key,
                            std::string sign_in_challenge)
     : user_id(user_id),
       name(name),
       public_key(public_key),
       bluetooth_type(bluetooth_type),
       bluetooth_address(bluetooth_address),
       persistent_symmetric_key(persistent_symmetric_key),
       sign_in_challenge(sign_in_challenge) {}
 
 RemoteDevice::RemoteDevice(const RemoteDevice& other) = default;
 
 RemoteDevice::~RemoteDevice() {}
 
+std::string RemoteDevice::GetDeviceId() {
+   std::string to_return;
+   base::Base64Encode(public_key, &to_return);
+   return to_return;
+}
+
+std::string RemoteDevice::GetTruncatedDeviceIdForLogs() {
+   std::string id = GetDeviceId();
+   if (id.length() <= 10) {
+      return id;
+   }
+
+   return id.substr(0, 5) + "..." + id.substr(id.length() - 5, id.length());
+}
+
 }  // namespace cryptauth