{
    "Function": "permit",
    "File": "contracts/contracts/Pair.sol",
    "Parent Contracts": [],
    "High-Level Calls": [],
    "Internal Calls": [
        "keccak256(bytes)",
        "ecrecover(bytes32,uint8,bytes32,bytes32)",
        "keccak256(bytes)",
        "abi.encode()",
        "keccak256(bytes)",
        "keccak256(bytes)",
        "keccak256(bytes)",
        "require(bool,string)",
        "abi.encodePacked()",
        "abi.encode()",
        "require(bool,string)",
        "keccak256(bytes)"
    ],
    "Library Calls": [],
    "Low-Level Calls": [],
    "Code": "function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external {\n        require(deadline >= block.timestamp, 'Pair: EXPIRED');\n        DOMAIN_SEPARATOR = keccak256(\n            abi.encode(\n                keccak256('EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)'),\n                keccak256(bytes(name)),\n                keccak256(bytes('1')),\n                block.chainid,\n                address(this)\n            )\n        );\n        bytes32 digest = keccak256(\n            abi.encodePacked(\n                '\\x19\\x01',\n                DOMAIN_SEPARATOR,\n                keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline))\n            )\n        );\n        address recoveredAddress = ecrecover(digest, v, r, s);\n        require(recoveredAddress != address(0) && recoveredAddress == owner, 'Pair: INVALID_SIGNATURE');\n        allowance[owner][spender] = value;\n\n        emit Approval(owner, spender, value);\n    }"
}