{
    "Function": "_isValidSignature",
    "File": "src/token/ERC20.sol",
    "Parent Contracts": [
        "src/util/Context.sol"
    ],
    "High-Level Calls": [],
    "Internal Calls": [
        "ecrecover(bytes32,uint8,bytes32,bytes32)",
        "abi.encodeWithSelector()",
        "abi.decode()",
        "mload(uint256)",
        "mload(uint256)",
        "byte(uint256,uint256)",
        "mload(uint256)"
    ],
    "Library Calls": [],
    "Low-Level Calls": [
        "staticcall"
    ],
    "Code": "function _isValidSignature(address signer, bytes32 digest, bytes memory signature) internal view returns (bool) {\n        if (signature.length == 65) {\n            bytes32 r;\n            bytes32 s;\n            uint8 v;\n            assembly {\n                r := mload(add(signature, 0x20))\n                s := mload(add(signature, 0x40))\n                v := byte(0, mload(add(signature, 0x60)))\n            }\n            if (signer == ecrecover(digest, v, r, s)) {\n                return true;\n            }\n        }\n\n        (bool success, bytes memory result) =\n            signer.staticcall(abi.encodeWithSelector(IERC1271.isValidSignature.selector, digest, signature));\n        return (success && result.length == 32 && abi.decode(result, (bytes4)) == IERC1271.isValidSignature.selector);\n    }"
}