KarpelesLab / tss-lib / 24235878752

77%

Build Type

push

github

Committed by MagicalTux

Commit Message

add auto-KDD support to ecdsatss for HD-derived signing

Introduces (*Key).NewSigningWithKDD, a drop-in replacement for NewSigning
that signs under a BIP32-derived child key. The master Key is cloned and
shifted by delta (ECDSAPub and every BigXj[j] by delta*G, Xi by delta mod N)
so the resulting threshold signature verifies under the derived child pubkey.
This restores the ecdsa/signing.NewLocalPartyWithAutoKDD behavior that was
missing from the new broker-based API.

Covered by TestKeygenAndSignWithKDD: end-to-end keygen + BIP32 derivation via
crypto/ckd + threshold sign + verify against the child pubkey + assertion
that the master Key is byte-identical afterwards, plus a nil-delta
passthrough guard.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Coverage Stats

23 of 27 new or added lines in 1 file covered. (85.19%)

4 existing lines in 3 files now uncovered.

9691 of 12828 relevant lines covered (75.55%)

2191.51 hits per line