This class models Quic Handshake Packets, as defined by RFC 9000, Section 17.2.4:

A Handshake packet uses long headers with a type value of 0x02, followed
   by the Length and Packet Number fields; see Section 17.2. The first byte
   contains the Reserved and Packet Number Length bits; see Section 17.2.
   It is used to carry cryptographic handshake messages and acknowledgments
   from the server and client.

   Handshake Packet {
     Header Form (1) = 1,
     Fixed Bit (1) = 1,
     Long Packet Type (2) = 2,
     Reserved Bits (2),
     Packet Number Length (2),
     Version (32),
     Destination Connection ID Length (8),
     Destination Connection ID (0..160),
     Source Connection ID Length (8),
     Source Connection ID (0..160),
     Length (i),
     Packet Number (8..32),
     Packet Payload (..),
   }

Subclasses of this class may be used to model packets exchanged with either Quic Version 1 or Quic Version 2. Note that Quic Version 2 uses the same Handshake Packet structure than Quic Version 1, but uses a different long packet type than that shown above. See RFC 9369, Section 3.2.