feat(iso-webauthn-varsig): align wire format with non-recursive spec#2
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Restructure the WebAuthn varsig wire format per Gozala's suggestion (ChainAgnostic/varsig#11) to avoid recursion: - Header: prefix version innerAlgorithm curve webauthnMarker (removed multihashCode, multihashLength, payloadEncoding from header) - Body: clientData before authData (swapped order) - Body: signatureHashAlgorithm + encodingInfo moved to body before raw signature bytes - Encoder accepts optional EncodeOptions for custom hash/encoding - Decoder returns signatureHashAlgorithm/encodingInfo instead of multihashCode/multihashLength - Added wire-format, custom options, and backwards-compat tests - Documented ABNF wire format in readme - Bumped version to 0.2.0 (breaking change) Closes #1
This was referenced Feb 24, 2026
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Description
Add
iso-webauthn-varsigpackage implementing the non-recursive WebAuthn varsig wire format per Gozala's suggestion on the ChainAgnostic varsig spec.The wire format aligns with the dialog-db Go/Rust reference implementation:
prefix version innerAlgorithm curve webauthnMarkerclientDataLen clientDataJSON authDataLen authenticatorData signatureHashAlgorithm encodingInfo signatureBytesEncoder accepts optional
EncodeOptionsfor customsignatureHashAlgorithm/encodingInfo(defaults to SHA-256 / raw). Includes full test suite (node + browser) and ABNF wire format documentation in readme.Link to issue
Closes #1
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