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add evmAbi module, integrate keccak - #906
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WalkthroughThe change adds EIP-712 and EVM ABI utilities, stores salted domain separators, and updates ShieldedMultiSigV2 and ShieldedMultiSigV3 to verify Keccak-based typed-data digests. Tests cover encoding, domain binding, parameter binding, and replay rejection. ChangesEIP-712 multisig signing
Priority: ⬆️ High Estimated code review effort: 4 (Complex) | ~60 minutes Change: Feature · Severity of issue fixed: High Sequence Diagram(s)sequenceDiagram
participant Signer
participant ShieldedMultiSigV2
participant Eip712
participant Keccak
Signer->>ShieldedMultiSigV2: provide typed operation signature
ShieldedMultiSigV2->>Eip712: construct domain and typed-data digest
Eip712->>Keccak: hash domain and struct preimages
Keccak-->>ShieldedMultiSigV2: return digest
ShieldedMultiSigV2-->>Signer: accept or reject signature
Suggested reviewers: Merge Risk: 🔵 Low · up to The implementation is mergeable with a small documentation correction to prevent deployments from reusing salts across networks and weakening replay protection. 🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (2 warnings)
✅ Passed checks (3 passed)
Full details: Linked Issues checkExplanation Issue Resolution Complete the outer digest integration in Full details: Docstring CoverageExplanation Docstring coverage is 75.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 8 functions across 7 files. (12 skipped: 12 unsupported.) ✨ Finishing Touches🧪 Generate unit tests (beta)
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- 🪄 Fix CodeRabbit comments on this PR
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In `@contracts/src/multisig/presets/ShieldedMultiSigV3.compact`:
- Around line 76-83: Update the EIP-712 domain documentation in
ShieldedMultiSigV3 and the corresponding V2 contract to require instanceSalt be
cryptographically random and unique per deployment and network. Replace the
statement that no security property depends on instanceSalt, while keeping
chainId absent and preserving the existing kernel.self().bytes operation
binding.
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📒 Files selected for processing (19)
CHANGELOG.mdcontracts/package.jsoncontracts/src/crypto/Eip712.compactcontracts/src/crypto/test/Eip712.test.tscontracts/src/crypto/test/mocks/MockEip712.compactcontracts/src/crypto/test/simulators/Eip712Simulator.tscontracts/src/multisig/examples/ShieldedMultiSigV2Example.compactcontracts/src/multisig/examples/ShieldedMultiSigV3Example.compactcontracts/src/multisig/presets/ShieldedMultiSigV2.compactcontracts/src/multisig/presets/ShieldedMultiSigV3.compactcontracts/src/multisig/presets/test/ShieldedMultiSigV2.test.tscontracts/src/multisig/presets/test/ShieldedMultiSigV3.test.tscontracts/src/multisig/presets/test/mocks/MockShieldedMultiSigV2.compactcontracts/src/multisig/presets/test/mocks/MockShieldedMultiSigV3.compactcontracts/src/multisig/test/EcdsaTestUtils.tscontracts/src/utils/EvmAbi.compactcontracts/src/utils/test/EvmAbi.test.tscontracts/src/utils/test/mocks/MockEvmAbi.compactcontracts/src/utils/test/simulators/EvmAbiSimulator.ts
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| ).rejects.toThrow('Multisig: invalid signature'); | ||
| }); | ||
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| describe('parameter binding', () => { |
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Non-zero recipient kind has no positive test at the preset level
🔴 blocking: EvmAbi_uint8Word(to.kind as Uint<8>) for Contract / UnshieldedUser is pinned only in the EvmAbi unit spec. Every succeeding execute here uses kind 0, and the kind-redirect rejection passes for any wrong non-zero word.
Add a dry-only execute to { kind: Contract, address } with the ethers digest (recipientKind: 2) asserting success, mirroring the V3 contract-recipient mint.
added by claude (dev3-midnight-basic-review)
| * `verifyingContract`'s `address` type. Replay protection therefore does not | ||
| * come from the domain but from `mint` and `burn` binding `kernel.self()` in | ||
| * their structs. `instanceSalt` is passed so the domain also distinguishes | ||
| * deployments for a signer that inspects it; no security property depends on |
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Cross-network replay is undocumented and the salt claim is too strong
❔ question: The domain has no chainId. A byte-identical redeploy on another network reproduces the address and the salt together, so neither word separates the two and a testnet signature replays on mainnet.
Is "no security property depends on that" intended? Suggest a deployment requirement instead: constructor args, salt included, must differ per network. Same text in V2 at line 59.
added by claude (dev3-midnight-basic-review)
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Good question! Some of the docs got muddied while resolving conflicts so that's my bad
The domain has no chainId. A byte-identical redeploy on another network reproduces the address and the salt together, so neither word separates the two and a testnet signature replays on mainnet
The ledger randomizes addresses at deployment (the reason we can't use counterfactual addresses) so a byte-identical redeployment produces a unique address
Here's the source chain to make it easier to verify
Is "no security property depends on that" intended?
Agreed that it's too strong of a statement. Will improve this part of the doc
Suggest a deployment requirement instead: constructor args, salt included, must differ per network
rng makes the "differ per network" moot. The salt is a requirement for the signer commitments though. Will fix
| * | ||
| * @param {Bytes<32>} hashedName - `keccak256(bytes(name))`. | ||
| * @param {Bytes<32>} hashedVersion - `keccak256(bytes(version))`. | ||
| * @param {Bytes<32>} salt - Per-deployment, per-network random value. |
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Salt param still framed as the network separator
⚪ nitpick (if-minor): contracts/src/crypto/Eip712.compact:123
The module doc now ranks the salt as the weaker, domain-level separator and puts network separation on the address. Drop "per-network".
added by claude (dev3-midnight-basic-review)
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Great work @andrew-fleming! Ty!
Ports #906 (EIP-712 mint/burn digests, `_domainSeparator`) onto the renamed `NativeShieldedTokenIssuer` preset, mock, example and specs. The EIP-712 domain name follows the module name; `EcdsaTestUtils.ts` mirrors it. `mint` / `burn` row counts re-measured through the mock.
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This PR proposes to add the
evmAbimodule. Waiting to finalize outer digest and integration(Should) resolve #827
Summary by CodeRabbit
New Features
Breaking Changes
Bug Fixes