KarpelesLab / outscript / 28281572139

79%

Build Type

push

github

Committed by MagicalTux

Commit Message

add Cardano extended-key signing and BIP32-Ed25519 derivation

Add CardanoSigner interface and CardanoExtendedKey, which signs with a
BIP32-Ed25519 extended Ed25519 key (the 64-byte expanded secret used by
Cardano HD wallets, which crypto/ed25519 cannot consume). Signing reduces
the scalar mod L without re-clamping and uses the ref10 primitives from
KarpelesLab/edwards25519, producing standard Ed25519 signatures.
CardanoTx.Sign is refactored onto a new SignWith(...CardanoSigner) path.

Add CIP-1852 / BIP32-Ed25519 (V2) key derivation: Icarus master key from
entropy (CIP-3), private hardened+soft DeriveChild/DerivePath, and
watch-only public soft derivation via the new edwards25519.Add
(A' = A + 8*Z_L*B). Bumps edwards25519 to v1.1.8 for Add.

Verified against authoritative vectors: byte-equivalence with
crypto/ed25519 for seed-expanded keys; the rust-ed25519-bip32 D1->D1_H0
hardened vector and its signature; and an end-to-end Icarus entropy ->
m/1852'/1815'/0'/0/0 -> addr1 match against cardano-serialization-lib.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Coverage Stats

219 of 264 new or added lines in 3 files covered. (82.95%)

1 existing line in 1 file now uncovered.

3343 of 4223 relevant lines covered (79.16%)

31.1 hits per line