{
    "Function": "_permit",
    "File": "contracts/v1/EIP2612.sol",
    "Parent Contracts": [
        "contracts/v1/EIP712Domain.sol",
        "contracts/v1/AbstractFiatTokenV1.sol",
        "contracts/util/IERC20.sol"
    ],
    "High-Level Calls": [
        "EIP712"
    ],
    "Internal Calls": [
        "require(bool,string)",
        "_approve",
        "_domainSeparatorV4",
        "abi.encode()",
        "require(bool,string)"
    ],
    "Library Calls": [
        "recover"
    ],
    "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    ) internal {\n        require(deadline >= block.timestamp, \"EIP2612: permit is expired\");\n\n        bytes memory data = abi.encode(\n            PERMIT_TYPEHASH,\n            owner,\n            spender,\n            value,\n            _permitNonces[owner]++,\n            deadline\n        );\n        require(\n            EIP712.recover(_domainSeparatorV4(), v, r, s, data) == owner,\n            \"EIP2612: invalid signature\"\n        );\n\n        _approve(owner, spender, value);\n    }"
}