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fix: use dynamic typehash with raw userOpHashes for smart session sig… #205

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fix: use dynamic typehash with raw userOpHashes for smart session sig… #205

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9f54118
fix: use dynamic typehash with raw userOpHashes for smart session sig…
fichiokaku Apr 6, 2026
cc85bde
fix: use NoMee fallback for smart session signatures (raw ECDSA, no S…
fichiokaku Apr 6, 2026
e4477ae
changed the mee version default for EIP 712 sig
vr16x Apr 7, 2026
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42 changes: 14 additions & 28 deletions src/modules/quotes/quotes.service.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -122,7 +122,7 @@ export class QuotesService {
} = options;

const isEIP712SupportedMeeVersion = this.isVersionConsistentAndAboveTarget(
"2.2.0",
"2.2.1",
meeVersions,
);

Expand Down Expand Up @@ -677,7 +677,7 @@ export class QuotesService {
} = options;

const isEIP712SupportedMeeVersion = this.isVersionConsistentAndAboveTarget(
"2.2.0",
"2.2.1",
meeVersions,
);
const isStxValidatorSupportedMeeVersion =
Expand Down Expand Up @@ -894,32 +894,18 @@ export class QuotesService {
case "simple": {
if (isSessionExists) {
if (isEIP712SupportedMeeVersion) {
signature = concatHex([
signatureType, // Simple signature type
encodeAbiParameters(
[
{ type: "bytes32" }, // stxStructTypeHash
{ type: "uint256" }, // userOp index
{ type: "bytes32[]" }, // meeUserOpHashes - array of hashes
{ type: "bytes" }, // superTxSignature
],
[
SUPERTX_MEEUSEROP_STRUCT_TYPEHASH,
// For trusted sponsorship, as we're ignoring the payment userOp, index should be sub by 1 to account for that
// The index will be always greater than 1 if its sponsorship mode so sub by 1 is not a problem
isEIP712TrustedSponsorshipSupported &&
isTrustedSponsorship
? BigInt(index - 1)
: BigInt(index),
// If it is a trusted sponsorship, the payment userop can be skipped because it is not going to be executed at all.
isEIP712TrustedSponsorshipSupported &&
isTrustedSponsorship
? meeUserOpHashes.slice(1)
: meeUserOpHashes,
signatureData,
],
),
]);
// Smart sessions with MEE >= 2.2.1: use raw ECDSA signature (no MEE prefix).
// This routes through NoMeeFlowLib.validateSignatureForOwner on-chain,
// which does plain ECDSA recovery against the raw userOpHash.
//
// We cannot use the MEE simple mode (0x177eee00) because:
// - SmartSession calls K1MeeValidator.validateSignatureWithData externally
// - compareAndGetFinalHash calls hashTypedDataForAccount(msg.sender, ...)
// - msg.sender is SmartSession's address, not the account
// - SmartSession doesn't implement eip712Domain() → reverts
//
// Session expiry is handled by SmartSession's own policies.
signature = signatureData;
} else {
signature = concatHex([
signatureType,
Expand Down
1 change: 0 additions & 1 deletion src/modules/quotes/schemas.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -23,7 +23,6 @@ export const meeVersionSchema = z.enum([
"3.0.0",
"2.3.0",
"2.2.1",
"2.2.0",
"2.1.0",
"2.0.0",
"1.1.0",
Expand Down
23 changes: 4 additions & 19 deletions src/modules/simulator/simulation.service.ts
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Expand Up @@ -121,24 +121,9 @@ export class SimulationService {
"0xcae0d1955b99d4832aef73ed0a2237045fad91a738ee5b96ba76b9a12ffc6f824ab2ecaeeeb903b50704fdf4a5d64216adf7d6aaaca0ed2a67b86d8525c4b4bb1c" as Hex;

if (sessionInfo?.sessionDetails) {
const dummySignature = concatHex([
"0x177eee00", // Simple signature type
encodeAbiParameters(
[
{ type: "bytes32" }, // stxStructTypeHash
{ type: "uint256" }, // userOp index
{ type: "bytes32[]" }, // meeUserOpHashes - array of hashes
{ type: "bytes" }, // superTxSignature
],
[
SUPERTX_MEEUSEROP_STRUCT_TYPEHASH,
BigInt(index),
// If it is a trusted sponsorship, the payment userop can be skipped because it is not going to be executed at all.
isTrustedSponsorship ? meeUserOpHashes.slice(1) : meeUserOpHashes,
dummyStxSig,
],
),
]);
// Smart sessions with MEE >= 2.2.1: use raw ECDSA signature (no MEE prefix).
// Routes through NoMeeFlowLib.validateSignatureForOwner on-chain.
const dummySignature = dummyStxSig;

const dummySessionDetails: GrantPermissionResponseType = {
...sessionInfo?.sessionDetails,
Expand Down Expand Up @@ -635,7 +620,7 @@ export class SimulationService {
let meeVersion: MeeVersionsType = "2.0.0";

// From this version, the EIP712 signatures are being supported and the dummy signature needs to be different here
const eip712SignatureVersionTarget: MeeVersionsType = "2.2.0";
const eip712SignatureVersionTarget: MeeVersionsType = "2.2.1";

if (meeVersionInfo) {
meeVersion = meeVersionInfo.version.version;
Expand Down
4 changes: 2 additions & 2 deletions src/modules/user-ops/userop.service.ts
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Expand Up @@ -458,14 +458,14 @@ export class UserOpService {
let meeUserOpHash: Hex;

if (isEIP712SupportedMeeVersion && isSimpleMode) {
// If the meeVersion >= 2.2.0, V2 meeUserOp hash will be generated for simple mode
// If the meeVersion >= 2.2.1, V2 meeUserOp hash will be generated for simple mode
meeUserOpHash = getMeeUserOpHashEip712(
userOpHash,
lowerBoundTimestamp,
upperBoundTimestamp,
);
} else {
// If the meeVersion is less than 2.2.0, legacy meeUserOp hash will be generated
// If the meeVersion is less than 2.2.1, legacy meeUserOp hash will be generated
meeUserOpHash = getMeeUserOpHash(
userOpHash,
lowerBoundTimestamp,
Expand Down
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