Make small-order checks in EdDSA optional?
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Description
The current spec says:
- If the key data of key represents an invalid point or a small-order element on the Elliptic Curve of Ed25519, return
false.
However, implementations don't consistently perform this check: https://wpt.fyi/results/WebCryptoAPI/sign_verify/eddsa_small_order_points.https.any.html?run_id=6218645916352512&run_id=4841029519015936&run_id=5149644930940928&run_id=5118414478901248
So, we may want to make it optional.
This is a copy of https://github.com/WICG/webcrypto-secure-curves/issues/27, to keep track of that issue after we archive WICG/webcrypto-secure-curves.
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reading the quoted Ed25519 requirement and comparing its behavior across the linked WPT results. Review the copied WICG issue for the surrounding discussion; the work is done when the specification has a settled decision and clearly defines whether small-order checks are required or optional.
Written by the indexing model from the issue text.
Assessment
- Domain
- cryptography, security
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 30/100