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6 Commits

Author SHA1 Message Date
Luke Parker
301634dd8e Add support for Ristretto 
Replaces P-256 as the curve used for testing FROST.
 2022-06-06 04:22:49 -04:00
Luke Parker
e0ce6e5c12 Add Ed25519 to FROST and remove expand_xmd for elliptic_curve's 
Doesn't fully utilize ec's hash2curve module as k256 Scalar doesn't have 
FromOkm for some reason. The previously present bigint reduction is 
preserved.

Updates ff/group to 0.12.

Premised on https://github.com/cfrg/draft-irtf-cfrg-frost/pull/205 being 
merged, as while this Ed25519 is vector compliant, it's technically not 
spec compliant due to that conflict.
 2022-06-06 02:18:25 -04:00
Luke Parker
55a895d65a Add first party support for k256 and p256 under feature flags 
Given the lack of vectors for k256, it's currently a match of the p256 
spec (with a distinct context string), yet p256 is still always used 
when testing.
 2022-06-05 16:08:51 -04:00
Luke Parker
9b52cf4d20 Generalize out the FROST test for signing/signing with an offset 
Moves Schnorr signature tests from test_curve to the new test_schnorr, 
which is more a test_frost.

Relevant to https://github.com/serai-dex/serai/issues/9.
 2022-06-03 19:08:25 -04:00
Luke Parker
44452d9bfe Verify being FROST v5 compliant 
No functional changes have been made to signing, with solely slight API 
changes being made.

Technically not actually FROST v5 compatible, due to differing on zero 
checks and randomness, yet the vectors do confirm the core algorithm. 
For any valid FROST implementation, this will be interoperable if they 
can successfully communicate. For any devious FROST implementation, this 
will be fingerprintable, yet should still be valid.

Relevant to https://github.com/serai-dex/serai/issues/9 as any curve can 
now specify vectors for itself and be tested against them.

Moves the FROST testing curve from k256 to p256. Does not expose p256 
despite being compliant. It's not at a point I'm happy with it, notably 
regarding hash to curve, and I'm not sure I care to support p256. If it 
has value to the larger FROST ecosystem...
 2022-06-03 01:25:46 -04:00
Luke Parker
868a63a6b2 Start modularizing FROST tests as per https://github.com/serai-dex/serai/issues/9 2022-05-25 00:29:20 -04:00