RFC 8391, "XMSS: eXtended Merkle Signature Scheme", May 2018

Errata ID: 6352
Status: Reported
Type: Technical
Publication Format(s) : TEXT
Reported By: Andreas Kretschmer
Date Reported: 2020-12-09

Section Appendix A says:

The WOTS+ signature and public key formats are formally defined using
XDR [RFC4506] in order to provide an unambiguous, machine readable
definition. 

It should say:

The WOTS+ signature and public key formats are defined in a syntax similar to XDR [RFC4506].

Notes:

The definition is not machine readable, e.g. github.com/stellar/xdrgen fails.
Reason:
- some Identifiers contain "/" and "-", RFC4506 allows only letter, digits and underbars
- some enum bodies end with ",}", RFC4506 requests "}" here
- some discriminated union definitions have incomplete declarations in the case-spec, e.g. the union xmss_ots_signature refers to the wotsp-sha2_256 without giving a type.
- The encoding of some unions in the reference implementation is different to the encoding specified in RFC4506. The 4-byte discriminant is missing.

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