QByteArray NLPacket::hashForPacketAndSecret(const udt::Packet& packet, const QUuid& connectionSecret) {
QCryptographicHash hash(QCryptographicHash::Md5);
int offset = Packet::totalHeaderSize(packet.isPartOfMessage()) + sizeof(PacketType) + sizeof(PacketVersion)
+ NUM_BYTES_RFC4122_UUID + NUM_BYTES_MD5_HASH;
// add the packet payload and the connection UUID
hash.addData(packet.getData() + offset, packet.getDataSize() - offset);
hash.addData(connectionSecret.toRfc4122());
// return the hash
return hash.result();
}
QByteArray NLPacket::verificationHashInHeader(const udt::Packet& packet) {
int offset = Packet::totalHeaderSize(packet.isPartOfMessage()) + sizeof(PacketType) + sizeof(PacketVersion) + NUM_BYTES_RFC4122_UUID;
return QByteArray(packet.getData() + offset, NUM_BYTES_MD5_HASH);
}
PacketVersion NLPacket::versionInHeader(const udt::Packet& packet) {
auto headerOffset = Packet::totalHeaderSize(packet.isPartOfMessage());
return *reinterpret_cast<const PacketVersion*>(packet.getData() + headerOffset + sizeof(PacketType));
}
QUuid NLPacket::sourceIDInHeader(const udt::Packet& packet) {
int offset = Packet::totalHeaderSize(packet.isPartOfMessage()) + sizeof(PacketType) + sizeof(PacketVersion);
return QUuid::fromRfc4122(QByteArray::fromRawData(packet.getData() + offset, NUM_BYTES_RFC4122_UUID));
}
PacketType NLPacket::typeInHeader(const udt::Packet& packet) {
auto headerOffset = Packet::totalHeaderSize(packet.isPartOfMessage());
return *reinterpret_cast<const PacketType*>(packet.getData() + headerOffset);
}