#include "config.h"
#include "FidoHidPacket.h"
#if ENABLE(WEB_AUTHN)
#include <algorithm>
namespace fido {
FidoHidPacket::FidoHidPacket(Vector<uint8_t>&& data, uint32_t channelId)
: m_data(WTFMove(data))
, m_channelId(channelId)
{
}
std::unique_ptr<FidoHidInitPacket> FidoHidInitPacket::createFromSerializedData(const Vector<uint8_t>& serialized, size_t* remainingSize)
{
if (!remainingSize || serialized.size() != kHidPacketSize)
return nullptr;
size_t index = 0;
auto channelId = (serialized[index++] & 0xff) << 24;
channelId |= (serialized[index++] & 0xff) << 16;
channelId |= (serialized[index++] & 0xff) << 8;
channelId |= serialized[index++] & 0xff;
auto command = static_cast<FidoHidDeviceCommand>(serialized[index++] & 0x7f);
if (!isFidoHidDeviceCommand(command))
return nullptr;
uint16_t payloadSize = serialized[index++] << 8;
payloadSize |= serialized[index++];
uint16_t dataSize = std::min(payloadSize, static_cast<uint16_t>(kHidPacketSize - index));
*remainingSize = payloadSize - dataSize;
auto data = Vector<uint8_t>();
data.append(serialized.begin() + index, dataSize);
return std::make_unique<FidoHidInitPacket>(channelId, command, WTFMove(data), payloadSize);
}
FidoHidInitPacket::FidoHidInitPacket(uint32_t channelId, FidoHidDeviceCommand cmd, Vector<uint8_t>&& data, uint16_t payloadLength)
: FidoHidPacket(WTFMove(data), channelId)
, m_command(cmd)
, m_payloadLength(payloadLength)
{
}
Vector<uint8_t> FidoHidInitPacket::getSerializedData() const
{
Vector<uint8_t> serialized;
serialized.reserveInitialCapacity(kHidPacketSize);
serialized.append((m_channelId >> 24) & 0xff);
serialized.append((m_channelId >> 16) & 0xff);
serialized.append((m_channelId >> 8) & 0xff);
serialized.append(m_channelId & 0xff);
serialized.append(static_cast<uint8_t>(m_command) | 0x80);
serialized.append((m_payloadLength >> 8) & 0xff);
serialized.append(m_payloadLength & 0xff);
serialized.append(m_data.begin(), m_data.size());
serialized.grow(kHidPacketSize);
return serialized;
}
std::unique_ptr<FidoHidContinuationPacket> FidoHidContinuationPacket::createFromSerializedData(const Vector<uint8_t>& serialized, size_t* remainingSize)
{
if (!remainingSize || serialized.size() != kHidPacketSize)
return nullptr;
size_t index = 0;
auto channelId = (serialized[index++] & 0xff) << 24;
channelId |= (serialized[index++] & 0xff) << 16;
channelId |= (serialized[index++] & 0xff) << 8;
channelId |= serialized[index++] & 0xff;
auto sequence = serialized[index++];
size_t dataSize = std::min(*remainingSize, kHidPacketSize - index);
*remainingSize -= dataSize;
auto data = Vector<uint8_t>();
data.append(serialized.begin() + index, dataSize);
return std::make_unique<FidoHidContinuationPacket>(channelId, sequence, WTFMove(data));
}
FidoHidContinuationPacket::FidoHidContinuationPacket(const uint32_t channelId, const uint8_t sequence, Vector<uint8_t>&& data)
: FidoHidPacket(WTFMove(data), channelId)
, m_sequence(sequence)
{
}
Vector<uint8_t> FidoHidContinuationPacket::getSerializedData() const
{
Vector<uint8_t> serialized;
serialized.reserveInitialCapacity(kHidPacketSize);
serialized.append((m_channelId >> 24) & 0xff);
serialized.append((m_channelId >> 16) & 0xff);
serialized.append((m_channelId >> 8) & 0xff);
serialized.append(m_channelId & 0xff);
serialized.append(m_sequence);
serialized.append(m_data.begin(), m_data.size());
serialized.grow(kHidPacketSize);
return serialized;
}
}
#endif // ENABLE(WEB_AUTHN)