{
    "Function": "slitherConstructorConstantVariables",
    "File": "src/ERC20Permit.sol",
    "Parent Contracts": [
        "src/ERC20.sol",
        "src/interfaces/IERC20.sol",
        "src/Context.sol"
    ],
    "High-Level Calls": [],
    "Internal Calls": [],
    "Library Calls": [],
    "Low-Level Calls": [],
    "Code": "abstract contract ERC20Permit is ERC20 {\n    bytes32 public DOMAIN_SEPARATOR;\n\n    string private constant EIP191_PREFIX_FOR_EIP712_STRUCTURED_DATA = '\\x19\\x01';\n\n    // keccak256('EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)')\n    bytes32 private constant DOMAIN_TYPE_SIGNATURE_HASH =\n        bytes32(0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f);\n\n    // keccak256('Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)')\n    bytes32 private constant PERMIT_SIGNATURE_HASH =\n        bytes32(0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9);\n\n    mapping(address => uint256) public nonces;\n\n    constructor(string memory name) {\n        DOMAIN_SEPARATOR = keccak256(\n            abi.encode(\n                DOMAIN_TYPE_SIGNATURE_HASH,\n                keccak256(bytes(name)),\n                keccak256(bytes('1')),\n                block.chainid,\n                address(this)\n            )\n        );\n    }\n\n    function permit(\n        address issuer,\n        address spender,\n        uint256 value,\n        uint256 deadline,\n        uint8 v,\n        bytes32 r,\n        bytes32 s\n    ) external {\n        require(block.timestamp < deadline, 'EXPIRED');\n        require(uint256(s) <= 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0, 'INV_S');\n        require(v == 27 || v == 28, 'INV_V');\n\n        bytes32 digest = keccak256(\n            abi.encodePacked(\n                EIP191_PREFIX_FOR_EIP712_STRUCTURED_DATA,\n                DOMAIN_SEPARATOR,\n                keccak256(abi.encode(PERMIT_SIGNATURE_HASH, issuer, spender, value, nonces[issuer]++, deadline))\n            )\n        );\n\n        address recoveredAddress = ecrecover(digest, v, r, s);\n        require(recoveredAddress == issuer, 'INV_SIG');\n\n        // _approve will revert if issuer is address(0x0)\n        _approve(issuer, spender, value);\n    }\n}"
}