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.
Include the expanded human-readable part when selecting the codex32
checksum. This keeps regular codewords within the 93-symbol BCH period
and rejects the 94- and 95-symbol gap before the long checksum starts
at 96 symbols.
Split regular and long checksum construction and verification so their
periods can be tested independently. Add assertions for both selection
boundaries and the long checksum upper limit.
Refs: https://github.com/bitcoin/bips/pull/2258#issuecomment-5411804501
```
sed -z -i 's/Author: /Authors: /' bip-0*.md
sed -z -i 's/Author: /Authors: /' bip-0*.mediawiki
```
Also align correctly in case of multiple authors.
Also line up with additional items in the lines below.
```
sed -i -z 's/ Post-History: / Discussion: /' bip-0*.md
sed -i -z 's/ Post-History: / Discussion: /' bip-0*.mediawiki
```
* Change master seed to secret in most places, ''t'' to ''k'' and other term fixes
* Replace deleted linebreak, delete vestigal oxford commas
* errors->random errors, fix newlines, vector5: secret seed->codex32 secret
reduced the heading level of checksum and error correction to make the table of contents easier to parse.
Moved Master seed Encoding to be below Unshared Secret.
* BIP93: change codex32 characters to bech32 characters
* Fix hrp length off by 1 bug. Refactor validity condition to read easier.
