Add FIDO U2F message and packet classes

device/u2f/u2f_message_unittest.cc

+// Copyright 2016 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 "device/u2f/u2f_message.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace device {
+
+class U2fMessageTest : public testing::Test {};
+
+// Packets should be 64 bytes + 1 report ID byte
+TEST_F(U2fMessageTest, TestPacketSize) {
+  uint32_t channel_id = 0x05060708;
+  std::vector<uint8_t> data;
+
+  scoped_refptr<U2fPacket> init_packet(
+      new U2fInitPacket(channel_id, 0, data, data.size()));
+  EXPECT_EQ(65, init_packet->GetSerializedBuffer()->size());
+
+  scoped_refptr<U2fPacket> continuation_packet(
+      new U2fContinuationPacket(channel_id, 0, data));
+  EXPECT_EQ(65, continuation_packet->GetSerializedBuffer()->size());
+}
+
+/*
+ * U2f Init Packets are of the format:
+ * Byte 0:    0
+ * Byte 1-4:  Channel ID
+ * Byte 5:    Command byte
+ * Byte 6-7:  Big Endian size of data
+ * Byte 8-n:  Data block
+ *
+ * Remaining buffer is padded with 0
+ */
+TEST_F(U2fMessageTest, TestPacketData) {
+  uint32_t channel_id = 0xF5060708;
+  std::vector<uint8_t> data{10, 11};
+  uint8_t cmd = static_cast<uint8_t>(U2fMessage::Type::CMD_WINK);
+  scoped_refptr<U2fPacket> init_packet(
+      new U2fInitPacket(channel_id, cmd, data, data.size()));
+  int index = 0;
+
+  EXPECT_EQ(0, init_packet->GetSerializedBuffer()->data()[index++]);
+  EXPECT_EQ((channel_id >> 24) & 0xff,
+            static_cast<uint8_t>(
+                init_packet->GetSerializedBuffer()->data()[index++]));
+  EXPECT_EQ((channel_id >> 16) & 0xff,
+            static_cast<uint8_t>(
+                init_packet->GetSerializedBuffer()->data()[index++]));
+  EXPECT_EQ((channel_id >> 8) & 0xff,
+            static_cast<uint8_t>(
+                init_packet->GetSerializedBuffer()->data()[index++]));
+  EXPECT_EQ(channel_id & 0xff,
+            static_cast<uint8_t>(
+                init_packet->GetSerializedBuffer()->data()[index++]));
+  EXPECT_EQ(cmd, static_cast<uint8_t>(
+                     init_packet->GetSerializedBuffer()->data()[index++]));
+
+  EXPECT_EQ(data.size() >> 8,
+            static_cast<uint8_t>(
+                init_packet->GetSerializedBuffer()->data()[index++]));
+  EXPECT_EQ(data.size() & 0xff,
+            static_cast<uint8_t>(
+                init_packet->GetSerializedBuffer()->data()[index++]));
+  EXPECT_EQ(data.at(0), init_packet->GetSerializedBuffer()->data()[index++]);
+  EXPECT_EQ(data.at(1), init_packet->GetSerializedBuffer()->data()[index++]);
+  for (; index < init_packet->GetSerializedBuffer()->size(); index++) {
+    EXPECT_EQ(0, init_packet->GetSerializedBuffer()->data()[index])
+        << "mismatch at index " << index;
+  }
+}
+
+TEST_F(U2fMessageTest, TestPacketConstructors) {
+  uint32_t channel_id = 0x05060708;
+  std::vector<uint8_t> data{10, 11};
+  uint8_t cmd = static_cast<uint8_t>(U2fMessage::Type::CMD_WINK);
+  scoped_refptr<U2fInitPacket> orig_packet(
+      new U2fInitPacket(channel_id, cmd, data, data.size()));
+
+  size_t payload_length = static_cast<size_t>(orig_packet->payload_length());
+  scoped_refptr<U2fInitPacket> reconstructed_packet =
+      U2fInitPacket::CreateFromSerializedData(
+          orig_packet->GetSerializedBuffer(), &payload_length);
+  EXPECT_EQ(orig_packet->command(), reconstructed_packet->command());
+  EXPECT_EQ(orig_packet->payload_length(),
+            reconstructed_packet->payload_length());
+  EXPECT_THAT(orig_packet->GetPacketPayload(),
+              testing::ContainerEq(reconstructed_packet->GetPacketPayload()));
+
+  EXPECT_EQ(channel_id, reconstructed_packet->channel_id());
+
+  ASSERT_EQ(orig_packet->GetSerializedBuffer()->size(),
+            reconstructed_packet->GetSerializedBuffer()->size());
+  for (size_t i = 0;
+       i < static_cast<size_t>(orig_packet->GetSerializedBuffer()->size());
+       ++i) {
+    EXPECT_EQ(orig_packet->GetSerializedBuffer()->data()[i],
+              reconstructed_packet->GetSerializedBuffer()->data()[i]);
+  }
+}
+
+TEST_F(U2fMessageTest, TestMaxLengthPacketConstructors) {
+  uint32_t channel_id = 0xAAABACAD;
+  std::vector<uint8_t> data;
+  for (size_t i = 0; i < U2fMessage::kMaxMessageSize; ++i)
+    data.push_back(static_cast<uint8_t>(i % 0xff));
+
+  U2fMessage::Type cmd = U2fMessage::Type::CMD_MSG;
+  scoped_refptr<U2fMessage> orig_msg =
+      U2fMessage::Create(channel_id, cmd, data);
+  auto it = orig_msg->begin();
+  scoped_refptr<U2fMessage> new_msg =
+      U2fMessage::CreateFromSerializedData((*it)->GetSerializedBuffer());
+  it++;
+
+  for (; it != orig_msg->end(); ++it)
+    new_msg->AddContinuationPacket((*it)->GetSerializedBuffer());
+
+  auto orig_it = orig_msg->begin();
+  auto new_it = new_msg->begin();
+
+  for (; orig_it != orig_msg->end() && new_it != new_msg->end();
+       ++orig_it, ++new_it) {
+    EXPECT_THAT((*orig_it)->GetPacketPayload(),
+                testing::ContainerEq((*new_it)->GetPacketPayload()));
+
+    EXPECT_EQ((*orig_it)->channel_id(), (*new_it)->channel_id());
+
+    ASSERT_EQ((*orig_it)->GetSerializedBuffer()->size(),
+              (*new_it)->GetSerializedBuffer()->size());
+    for (size_t i = 0;
+         i < static_cast<size_t>((*new_it)->GetSerializedBuffer()->size());
+         ++i) {
+      EXPECT_EQ((*orig_it)->GetSerializedBuffer()->data()[i],
+                (*new_it)->GetSerializedBuffer()->data()[i]);
+    }
+  }
+}
+
+TEST_F(U2fMessageTest, TestMessagePartitoning) {
+  uint32_t channel_id = 0x01010203;
+  std::vector<uint8_t> data(U2fMessage::kInitPacketDataSize + 1);
+  scoped_refptr<U2fMessage> two_packet_message =
+      U2fMessage::Create(channel_id, U2fMessage::Type::CMD_PING, data);
+  EXPECT_EQ(2U, two_packet_message->NumPackets());
+
+  data.resize(U2fMessage::kInitPacketDataSize);
+  scoped_refptr<U2fMessage> one_packet_message =
+      U2fMessage::Create(channel_id, U2fMessage::Type::CMD_PING, data);
+  EXPECT_EQ(1U, one_packet_message->NumPackets());
+
+  data.resize(U2fMessage::kInitPacketDataSize +
+              U2fMessage::kContinuationPacketDataSize + 1);
+  scoped_refptr<U2fMessage> three_packet_message =
+      U2fMessage::Create(channel_id, U2fMessage::Type::CMD_PING, data);
+  EXPECT_EQ(3U, three_packet_message->NumPackets());
+}
+
+TEST_F(U2fMessageTest, TestMaxSize) {
+  uint32_t channel_id = 0x00010203;
+  std::vector<uint8_t> data(U2fMessage::kMaxMessageSize + 1);
+  scoped_refptr<U2fMessage> oversize_message =
+      U2fMessage::Create(channel_id, U2fMessage::Type::CMD_PING, data);
+  EXPECT_EQ(nullptr, oversize_message);
+}
+
+TEST_F(U2fMessageTest, TestDeconstruct) {
+  uint32_t channel_id = 0x0A0B0C0D;
+  std::vector<uint8_t> data(U2fMessage::kMaxMessageSize, 0x7F);
+  scoped_refptr<U2fMessage> filled_message =
+      U2fMessage::Create(channel_id, U2fMessage::Type::CMD_PING, data);
+
+  EXPECT_THAT(data, testing::ContainerEq(filled_message->GetMessagePayload()));
+}
+
+TEST_F(U2fMessageTest, TestDeserialize) {
+  uint32_t channel_id = 0x0A0B0C0D;
+  std::vector<uint8_t> data(U2fMessage::kMaxMessageSize);
+
+  scoped_refptr<U2fMessage> orig_message =
+      U2fMessage::Create(channel_id, U2fMessage::Type::CMD_PING, data);
+  std::list<scoped_refptr<net::IOBufferWithSize>> orig_list;
+  scoped_refptr<net::IOBufferWithSize> buf = orig_message->PopNextPacket();
+  orig_list.push_back(buf);
+
+  scoped_refptr<U2fMessage> new_message =
+      U2fMessage::CreateFromSerializedData(buf);
+  while (!new_message->MessageComplete()) {
+    buf = orig_message->PopNextPacket();
+    orig_list.push_back(buf);
+    new_message->AddContinuationPacket(buf);
+  }
+
+  while ((buf = new_message->PopNextPacket())) {
+    ASSERT_EQ(buf->size(), orig_list.front()->size());
+    EXPECT_EQ(0, memcmp(buf->data(), orig_list.front()->data(), buf->size()));
+    orig_list.pop_front();
+  }
+}
+}  // namespace device