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fix(key-wallet): refuse DIP-14 256-bit children in BLS and SLIP-10 derivation - #1051
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📝 WalkthroughWalkthroughBLS BIP32 and SLIP-10 derivation reject 256-bit child numbers before converting them to 32-bit indices. Tests verify the corresponding errors for direct derivation and paths. ChangesDerivation validation
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🟠 High · up to The production fix correctly rejects DIP-14 256-bit child indices in BLS and Ed25519 derivation. However, the new BLS test does not compile, which breaks the entire key-wallet unit-test build. Add an unwrap before derive_pub to fix it. The fix is one line, but it should land before merging. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## dev #1051 +/- ##
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+ Coverage 77.11% 77.14% +0.02%
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Files 329 329
Lines 83662 83692 +30
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+ Hits 64520 64565 +45
+ Misses 19142 19127 -15
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Actionable comments posted: 1
- 🪄 Fix CodeRabbit comments on this PR
🤖 Prompt to fix review comments
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Inline comments:
In `@key-wallet/src/derivation_bls_bip32.rs`:
- Line 1768: In the test using
`master.to_extended_pub_key().derive_pub(normal)`, unwrap the `Result` returned
by `to_extended_pub_key()` before calling `derive_pub`, so the test compiles and
derives from the extended public key.
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key-wallet/src/derivation_bls_bip32.rs
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…rivation ExtendedBLSPrivKey / ExtendedBLSPubKey and ExtendedEd25519PrivKey hash the child index as u32::from(child), which maps every Normal256 / Hardened256 child to u32::MAX. A path with a 256-bit level therefore derived one key for every identifier at that level, with no error. DIP-14 defines 256-bit children for secp256k1 only, and dashbls / SLIP-10 have 32-bit indices, so these derivers now refuse such a child: InvalidDerivationPath for BLS (private and public), InvalidChildNumberFormat for Ed25519. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Summary
ExtendedBLSPrivKey,ExtendedBLSPubKeyandExtendedEd25519PrivKeyput the child index into the HMAC asu32::from(child). That conversion maps everyNormal256/Hardened256child tou32::MAX, so a path with a DIP-14 256-bit level derived the same key for every identifier at that level, silently.DIP-14 defines 256-bit children for secp256k1 derivation only; dashbls and SLIP-10 have 32-bit indices, so there is no correct key to return. The derivers now refuse such a child instead:
derive_priv_with_mode,derive_pub_with_mode, and so everyderive_priv/derive_pub/derive_pathvariant):Error::InvalidDerivationPath.ckd_priv, and soderive_priv):Error::InvalidChildNumberFormat.Found while reviewing #1049, whose DIP-13 application paths use 256-bit levels. #1049 now fixes the key type at ECDSA, so it no longer depends on this, but a hand-built path could still reach these derivers.
Testing
test_256_bit_children_are_refusedinderivation_bls_bip32andderivation_slip10(private, public and path derivation). Both fail ondevand pass with the change.cargo test -p key-wallet -p key-wallet-ffi --all-features: all pass except fourperformance_teststhroughput assertions that failed only under a concurrent build and pass when run alone (9/9).cargo clippy -p key-wallet -p key-wallet-ffi --all-targets --all-features -- -D warnings: clean.🤖 Generated with Claude Code
PR Hygiene ·
a18208c/self-reviewedkey-wallet(key-wallet/src/derivation_bls_bip32.rs,key-wallet/src/derivation_slip10.rs) — approved by ZocoLiniWhen every box is checked the
PR Hygienecheck passes and this can merge.Summary by CodeRabbit