fix

foundry.toml

@@ -8,3 +8,4 @@ solc = "0.8.23"
 optimizer = true
 optimizer_runs = 1000000
 gas_price = 1000000000
+gas_reports = ["ERC20Paymaster"]

src/ERC20Paymaster.sol

@@ -11,7 +11,7 @@ import "./interfaces/IOracle.sol";
 import "@account-abstraction/contracts/core/EntryPoint.sol";
 import "@account-abstraction/contracts/core/UserOperationLib.sol";
 import "./utils/SafeTransferLib.sol";
-import "@openzeppelin/contracts/utils/cryptography/SignatureChecker.sol";
+import "./utils/SignatureCheckerLib.sol";
 
 using UserOperationLib for PackedUserOperation;
 
@@ -22,7 +22,7 @@ using UserOperationLib for PackedUserOperation;
 /// It also allows updating price configuration and withdrawing tokens by the contract owner.
 /// The contract uses an Oracle to fetch the latest token prices.
 /// @dev Inherits from BasePaymaster.
-///
+/// @custom:security-contact security@pimlico.io
 contract ERC20Paymaster is BasePaymaster {
     /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
     /*                       CUSTOM ERRORS                        */
@@ -200,7 +200,7 @@ contract ERC20Paymaster is BasePaymaster {
             uint48 validAfter = uint48(bytes6(paymasterConfig[26:32]));
 
             if (
-                !SignatureChecker.isValidSignatureNow(
+                !SignatureCheckerLib.isValidSignatureNowCalldata(
                     guarantor, getHash(userOp, validUntil, validAfter, 0), paymasterConfig[32:]
                 )
             ) {
@@ -225,7 +225,7 @@ contract ERC20Paymaster is BasePaymaster {
             }
 
             if (
-                !SignatureChecker.isValidSignatureNow(
+                !SignatureCheckerLib.isValidSignatureNowCalldata(
                     guarantor,
                     getHash(userOp, validUntil, validAfter, uint256(bytes32(paymasterConfig[0:32]))),
                     paymasterConfig[64:]