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Johnathan Corgan 71f1db42e3 Truncate NodeAddr from 32 bytes to 16 bytes (first 128 bits of SHA-256)

128-bit truncated SHA-256 provides adequate collision resistance
(2^64 birthday bound, 2^128 pre-image) while cutting per-packet
header overhead nearly in half, aligning with Yggdrasil's approach
and IPv6 address size.

Code changes:
- NodeAddr inner type [u8; 32] → [u8; 16], from_pubkey takes first 16 bytes
- DATA_HEADER_SIZE 68 → 36, signing_bytes capacity 80 → 48
- proof_bytes capacity 40 → 24
- Updated all make_node_addr test helpers and size assertion tests

Doc changes:
- All wire format tables and offset calculations updated
- AncestryEntry size 112 → 96 bytes
- Packet size examples recalculated throughout

2026-02-06 14:32:15 +00:00

design

Truncate NodeAddr from 32 bytes to 16 bytes (first 128 bits of SHA-256)

2026-02-06 14:32:15 +00:00

README.md

Add docs/design directory with protocol specifications

2026-01-25 22:02:54 +00:00

README.md

FIPS Documentation

Directory	Description
design/	Protocol design specifications and analysis