{
    "Function": "permit",
    "File": "contracts/lib/solmate/src/tokens/ERC20.sol",
    "Parent Contracts": [],
    "High-Level Calls": [],
    "Internal Calls": [
        "require(bool,string)",
        "keccak256(bytes)",
        "keccak256(bytes)",
        "keccak256(bytes)",
        "abi.encode()",
        "abi.encodePacked()",
        "require(bool,string)",
        "ecrecover(bytes32,uint8,bytes32,bytes32)",
        "DOMAIN_SEPARATOR"
    ],
    "Library Calls": [],
    "Low-Level Calls": [],
    "Code": "function permit(\n        address owner,\n        address spender,\n        uint256 value,\n        uint256 deadline,\n        uint8 v,\n        bytes32 r,\n        bytes32 s\n    ) public virtual {\n        require(deadline >= block.timestamp, \"PERMIT_DEADLINE_EXPIRED\");\n\n        // Unchecked because the only math done is incrementing\n        // the owner's nonce which cannot realistically overflow.\n        unchecked {\n            address recoveredAddress = ecrecover(\n                keccak256(\n                    abi.encodePacked(\n                        \"\\x19\\x01\",\n                        DOMAIN_SEPARATOR(),\n                        keccak256(\n                            abi.encode(\n                                keccak256(\n                                    \"Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)\"\n                                ),\n                                owner,\n                                spender,\n                                value,\n                                nonces[owner]++,\n                                deadline\n                            )\n                        )\n                    )\n                ),\n                v,\n                r,\n                s\n            );\n\n            require(recoveredAddress != address(0) && recoveredAddress == owner, \"INVALID_SIGNER\");\n\n            allowance[recoveredAddress][spender] = value;\n        }\n\n        emit Approval(owner, spender, value);\n    }"
}