pub const HP_MASK_LEN: usize = 15;Expand description
Bytes of the packet header protected by HP — WIRE v6 (anti-fingerprint): the
contiguous region at wire offset [0..15] — the WHOLE 15-byte header,
version(1) ‖ packet_number(8) ‖ flags(2) ‖ stream_id(2) ‖ epoch(1) ‖ path_id(1). The version byte is now masked too (no constant cleartext byte);
the inner session_id is off-wire and routing is by the outer (rotating)
ConnId. (Was [1..15]/14 in v5, [33..47] in v4.) The mask itself is a full
16-byte block; the first HP_MASK_LEN bytes are applied.