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Low 27 Bitcoin

Add support for SLIP39 in Cardano wallet functionality

Public commit record

What the developer wrote

Authored by willwang

83/100 · Strong
Add support for SLIP39 in Cardano wallet functionality

- Introduced new `slip23.rs` module for SLIP39 seed handling.
- Updated `address.rs` to include SLIP39 address derivation tests.
- Enhanced error handling in `errors.rs` for invalid seeds.
- Modified `lib.rs` to expose the new SLIP39 module.
- Updated various wallet functions to accommodate SLIP39, including key generation and transaction signing.
- Adjusted UI components to reflect SLIP39 compatibility in wallet operations.
✓ Specific, descriptive subject✓ Names a concrete action or component✓ Provides detailed explanatory context✓ Mentions testing or verification
The short version

What changed, and why it matters

This commit adds support for the SLIP39 standard (a way to split a wallet backup into multiple shares) to the Cardano wallet features of a Keystone hardware wallet. It is a feature addition, not a clear security fix. The code changes how Cardano master keys are derived when a SLIP39 wallet is used, and removes several UI blocks that previously disabled Cardano for SLIP39 users. There is no vendor statement or external report saying this commit fixes a vulnerability.

Recommended action

Treat this as a feature commit rather than a security patch. Reviewers should verify that the new SLIP23 implementation matches the SLIP-0023 specification exactly, that the `is_slip39` flag cannot be spoofed by untrusted callers, and that removing the previous Cardano/SLIP39 disable guards does not expose users to derivation-path or key-management edge cases. No urgent patching is indicated by the commit itself.

Security signals we found

01

New cryptographic key-derivation path added (SLIP-0023) for Cardano

02

Previous guard that disabled Cardano for SLIP39 wallets removed

03

Branching logic between BIP39 and SLIP39 master-key derivation in signing functions

04

Entropy length restricted to 16 or 32 bytes in new `cardano_get_pubkey_by_slip23` FFI

05

No explicit security bug or vulnerability described in commit message or diff

Risk score

Why this scored 27/100

Our methodology →
Potential impact 5/30
Exploitability 5/25
Stealth signal 5/15
Affected reach 5/15
Confidence 5/10
Evidence quality 2/5
Human-validated context

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