Add FIDO U2F message and packet classes

device/u2f/u2f_packet.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 <iostream>
+#include "device/u2f/u2f_packet.h"
+
+namespace device {
+
+U2fPacket::U2fPacket(const std::vector<char> data,
+                     const char channel_id[kChannelIdSize])
+    : data_(data) {
+  for (size_t index = 0; index < kChannelIdSize; ++index) {
+    channel_id_[index] = channel_id[index];
+  }

[Reilly Grant (use Gerrit), 2016/11/23 22:21:51]

nit: unnecessary braces

[Casey Piper, 2016/11/29 22:11:15]

Done.

+}
+
+U2fPacket::~U2fPacket() {}
+
+scoped_refptr<net::IOBufferWithSize> U2fPacket::GetBuffer() {
+  if (serialized_) {
+    return serialized_;
+  } else {
+    scoped_refptr<net::IOBufferWithSize> buffer(new net::IOBufferWithSize(0));
+    return buffer;

[Reilly Grant (use Gerrit), 2016/11/23 22:21:51]

one line: return make_scoped_refptr(new net::IOBufferWithSize(0));

[Casey Piper, 2016/11/29 22:11:15]

Done.

+  }
+}
+
+// U2F Initialization packet is defined as:
+// Offset Length
+// 0      4       Channel ID
+// 4      1       Command ID
+// 5      1       High order packet payload size
+// 6      1       Low order packet payload size
+// 7      (s-7)   Payload data
+U2fInitPacket::U2fInitPacket(const char channel_id[kChannelIdSize],
+                             const char cmd,
+                             const std::vector<char> data)
+    : U2fPacket(data, channel_id), command_(cmd) {
+  serialized_ = new net::IOBufferWithSize(kPacketSize);
+  size_t index = 0;
+  uint16_t size = data.size();
+  serialized_->data()[index++] = 0;
+  for (size_t i = 0; i < kChannelIdSize; ++i, index++) {
+    serialized_->data()[index] = channel_id_[i];
+  }

[Reilly Grant (use Gerrit), 2016/11/23 22:21:51]

nit (here and below): no braces for single line if/for/while.

[Casey Piper, 2016/11/29 22:11:15]

Acknowledged.

+
+  serialized_->data()[index++] = command_;
+  serialized_->data()[index++] = (size >> 8) & 0xff;
+  serialized_->data()[index++] = size & 0xff;
+  for (size_t data_idx = 0; data_idx < data_.size(); ++data_idx) {
+    serialized_->data()[index++] = data_.at(data_idx);
+  }
+  while ((int)index < serialized_->size()) {
+    serialized_->data()[index++] = 0;
+  }
+}
+
+U2fInitPacket::~U2fInitPacket() {}
+
+// U2F Continuation packet is defined as:
+// Offset Length
+// 0      4       Channel ID
+// 4      1       Packet sequence 0x00..0x7f
+// 5      (s-5)   Payload data
+U2fContPacket::U2fContPacket(const char channel_id[kChannelIdSize],
+                             const char sequence,
+                             std::vector<char> data)
+    : U2fPacket(data, channel_id), sequence_(sequence) {
+  serialized_ = new net::IOBufferWithSize(kPacketSize);
+  size_t index = 0;
+  for (; index < kChannelIdSize; ++index) {
+    serialized_->data()[index] = channel_id_[index];
+  }
+
+  serialized_->data()[index++] = sequence_;
+  for (size_t data_idx = 0; data_idx < data_.size(); ++data_idx) {
+    serialized_->data()[index++] = data_.at(data_idx);
+  }
+}
+
+U2fContPacket::~U2fContPacket() {}
+}  // namespace device;

[Reilly Grant (use Gerrit), 2016/11/23 22:21:51]

no ;

[Casey Piper, 2016/11/29 22:11:15]

Done.