fix: reject non-canonical Ed25519 point encodings - #132
Merged
Conversation
Enforce the RFC 8032 5.1.3 canonical-encoding checks when decoding a point: - Reject y-coordinates that are not reduced mod p (the 19 values in [p, 2^255-1]), regardless of the encoded x sign bit. - Reject the "negative zero" encoding (x == 0 with the sign bit set). Expand the malformed-encoding test to cover all 19 non-canonical y values with both sign bits, plus the negative-zero case.
✅ Heimdall Review Status
|
hsiuhsiu
marked this pull request as ready for review
August 14, 2026 21:58
Arash-Afshar
approved these changes
Aug 15, 2026
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
4 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Enforce the RFC 8032 5.1.3 canonical-encoding checks when decoding a point:
Expand the malformed-encoding test to cover all 19 non-canonical y values with both sign bits, plus the negative-zero case.