Ben Westgate 5117f5831b BIP93: Restrict supported master seed sizes ...

Restrict codex32-encoded BIP32 master seeds to 16, 20, 24, 28,
32, or 64 bytes. These sizes correspond to the BIP39 entropy
sizes and the 512-bit BIP32 seed produced by BIP39 recovery and provide
minimum six-character length gaps to reduce target length ambiguity
during optional insertion/deletion correction.

Move payload decoding out of the generic codex32 secret definition
and make it application-specific. Define the byte conversion and
length requirements under the master seed format instead.

Additionally:
- Enforce the new valid encoded lengths (48, 54, 61, 67, 74, 127) in
  the Python `ms32_decode` in-line reference.
- Remove obsolete short-checksum backward compatibility constraints and
  unsupported length test vectors.
- Add test vectors for 160, 192, and 224-bit master seeds
- Update rationale, compatibility, and reference implementation links.

2026-08-26 17:29:14 -05:00

44 KiB

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