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This address can then be used for verification purposes.\n The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:\n this function rejects them by requiring the `s` value to be in the lower\n half order, and the `v` value to be either 27 or 28.\n IMPORTANT: `hash` _must_ be the result of a hash operation for the\n verification to be secure: it is possible to craft signatures that\n recover to arbitrary addresses for non-hashed data. A safe way to ensure\n this is by receiving a hash of the original message (which may otherwise\n be too long), and then calling {toEthSignedMessageHash} on it." }, "implemented": true, "kind": "function", "modifiers": [], "name": "recover", "parameters": { "id": 23642, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 23639, "mutability": "mutable", "name": "hash", "nodeType": "VariableDeclaration", "scope": 23674, "src": "1089:12:12", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 23638, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "1089:7:12", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "visibility": "internal" }, { "constant": false, "id": 23641, "mutability": "mutable", "name": "signature", "nodeType": "VariableDeclaration", "scope": 23674, "src": "1103:22:12", "stateVariable": false, 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"t_type$_t_uint256_$", "typeString": "type(uint256)" }, "typeName": { "id": 23689, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "2946:7:12", "typeDescriptions": {} } }, "id": 23692, "isConstant": false, "isLValue": false, "isPure": false, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2946:10:12", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "<=", "rightExpression": { "hexValue": "307837464646464646464646464646464646464646464646464646464646464646463544353736453733353741343530314444464539324634363638314232304130", "id": 23693, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "2960:66:12", "typeDescriptions": { "typeIdentifier": "t_rational_57896044618658097711785492504343953926418782139537452191302581570759080747168_by_1", "typeString": "int_const 5789...(69 digits omitted)...7168" }, "value": "0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0" }, "src": "2946:80:12", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "45434453413a20696e76616c6964207369676e6174757265202773272076616c7565", "id": 23695, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "3028:36:12", "typeDescriptions": { "typeIdentifier": "t_stringliteral_520d1f787dbcafbbfc007fd2c4ecf3d2711ec587f3ee9a1215c0b646c3e530bd", "typeString": "literal_string \"ECDSA: invalid signature 's' value\"" }, "value": "ECDSA: invalid signature 's' value" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_520d1f787dbcafbbfc007fd2c4ecf3d2711ec587f3ee9a1215c0b646c3e530bd", "typeString": "literal_string \"ECDSA: invalid signature 's' value\"" } ], "id": 23688, 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"typeDescriptions": { "typeIdentifier": "t_stringliteral_8522ee1b53216f595394db8e80a64d9e7d9bd512c0811c18debe9f40858597e4", "typeString": "literal_string \"ECDSA: invalid signature 'v' value\"" }, "value": "ECDSA: invalid signature 'v' value" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_8522ee1b53216f595394db8e80a64d9e7d9bd512c0811c18debe9f40858597e4", "typeString": "literal_string \"ECDSA: invalid signature 'v' value\"" } ], "id": 23698, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ -18, -18 ], "referencedDeclaration": -18, "src": "3075:7:12", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 23707, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "3075:65:12", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 23708, "nodeType": "ExpressionStatement", "src": "3075:65:12" }, { "assignments": [ 23710 ], "declarations": [ { "constant": false, "id": 23710, "mutability": "mutable", "name": "signer", "nodeType": "VariableDeclaration", "scope": 23730, "src": "3235:14:12", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 23709, "name": "address", "nodeType": "ElementaryTypeName", "src": "3235:7:12", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" } ], "id": 23717, "initialValue": { "arguments": [ { "id": 23712, "name": "hash", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 23677, "src": "3262:4:12", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, { "id": 23713, "name": "v", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 23679, "src": "3268:1:12", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, { "id": 23714, "name": "r", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 23681, "src": "3271:1:12", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, { "id": 23715, "name": "s", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 23683, "src": "3274:1:12", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, { "typeIdentifier": "t_uint8", "typeString": "uint8" }, { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } ], "id": 23711, "name": "ecrecover", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": -6, "src": "3252:9:12", "typeDescriptions": { "typeIdentifier": "t_function_ecrecover_pure$_t_bytes32_$_t_uint8_$_t_bytes32_$_t_bytes32_$returns$_t_address_$", "typeString": "function (bytes32,uint8,bytes32,bytes32) pure returns (address)" } }, "id": 23716, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "3252:24:12", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "VariableDeclarationStatement", "src": "3235:41:12" }, { "expression": { "arguments": [ { "commonType": { "typeIdentifier": "t_address", "typeString": "address" }, "id": 23724, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 23719, "name": "signer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 23710, "src": "3294:6:12", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "arguments": [ { "hexValue": "30", "id": 23722, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "3312:1:12", "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" } ], "id": 23721, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "3304:7:12", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 23720, "name": "address", "nodeType": "ElementaryTypeName", "src": "3304:7:12", "typeDescriptions": {} } }, "id": 23723, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "3304:10:12", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address_payable", "typeString": "address payable" } }, "src": "3294:20:12", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "45434453413a20696e76616c6964207369676e6174757265", "id": 23725, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "3316:26:12", "typeDescriptions": { "typeIdentifier": "t_stringliteral_00043f6bf76368aa97c21698e9b9d4779e31902453daccf3525ddfb36e53e2be", "typeString": "literal_string \"ECDSA: invalid signature\"" }, "value": "ECDSA: invalid signature" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_00043f6bf76368aa97c21698e9b9d4779e31902453daccf3525ddfb36e53e2be", "typeString": "literal_string \"ECDSA: invalid signature\"" } ], "id": 23718, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ -18, -18 ], "referencedDeclaration": -18, "src": "3286:7:12", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 23726, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "3286:57:12", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 23727, "nodeType": "ExpressionStatement", "src": "3286:57:12" }, { "expression": { "id": 23728, "name": "signer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 23710, "src": "3361:6:12", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "functionReturnParameters": 23687, "id": 23729, "nodeType": "Return", "src": "3354:13:12" } ] }, "documentation": { "id": 23675, "nodeType": "StructuredDocumentation", "src": "1818:137:12", "text": " @dev Overload of {ECDSA-recover-bytes32-bytes-} that receives the `v`,\n `r` and `s` signature fields separately." }, "implemented": true, "kind": "function", "modifiers": [], "name": "recover", "parameters": { "id": 23684, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 23677, "mutability": "mutable", "name": "hash", "nodeType": "VariableDeclaration", "scope": 23731, "src": "1977:12:12", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 23676, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "1977:7:12", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "visibility": "internal" }, { "constant": false, "id": 23679, "mutability": "mutable", "name": "v", "nodeType": "VariableDeclaration", "scope": 23731, "src": "1991:7:12", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "typeName": { "id": 23678, "name": "uint8", "nodeType": "ElementaryTypeName", "src": "1991:5:12", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "visibility": "internal" }, { "constant": false, "id": 23681, "mutability": "mutable", "name": "r", "nodeType": "VariableDeclaration", "scope": 23731, "src": "2000:9:12", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 23680, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "2000:7:12", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "visibility": "internal" }, { "constant": false, "id": 23683, "mutability": "mutable", "name": "s", "nodeType": "VariableDeclaration", "scope": 23731, "src": "2011:9:12", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 23682, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "2011:7:12", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "visibility": "internal" } ], "src": "1976:45:12" }, "returnParameters": { "id": 23687, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 23686, "mutability": "mutable", "name": "", "nodeType": "VariableDeclaration", "scope": 23731, "src": "2045:7:12", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 23685, "name": "address", "nodeType": "ElementaryTypeName", "src": "2045:7:12", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" } ], "src": "2044:9:12" }, "scope": 23749, "stateMutability": "pure", "virtual": false, "visibility": "internal" }, { "id": 23748, "nodeType": "FunctionDefinition", "src": "3638:265:12", "body": { "id": 23747, "nodeType": "Block", "src": "3716:187:12", "statements": [ { "expression": { "arguments": [ { "arguments": [ { "hexValue": "19457468657265756d205369676e6564204d6573736167653a0a3332", "id": 23742, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "3854:34:12", "typeDescriptions": { "typeIdentifier": "t_stringliteral_178a2411ab6fbc1ba11064408972259c558d0e82fd48b0aba3ad81d14f065e73", "typeString": "literal_string hex\"19457468657265756d205369676e6564204d6573736167653a0a3332\"" }, "value": "\u0019Ethereum Signed Message:\n32" }, { "id": 23743, "name": "hash", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 23734, "src": "3890:4:12", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_stringliteral_178a2411ab6fbc1ba11064408972259c558d0e82fd48b0aba3ad81d14f065e73", "typeString": "literal_string hex\"19457468657265756d205369676e6564204d6573736167653a0a3332\"" }, { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } ], "expression": { "id": 23740, "name": "abi", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": -1, "src": "3837:3:12", "typeDescriptions": { "typeIdentifier": "t_magic_abi", "typeString": "abi" } }, "id": 23741, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "memberName": "encodePacked", "nodeType": "MemberAccess", "src": "3837:16:12", "typeDescriptions": { "typeIdentifier": "t_function_abiencodepacked_pure$__$returns$_t_bytes_memory_ptr_$", "typeString": "function () pure returns (bytes memory)" } }, "id": 23744, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "3837:58:12", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 23739, "name": "keccak256", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": -8, "src": "3827:9:12", "typeDescriptions": { "typeIdentifier": "t_function_keccak256_pure$_t_bytes_memory_ptr_$returns$_t_bytes32_$", "typeString": "function (bytes memory) pure returns (bytes32)" } }, "id": 23745, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "3827:69:12", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "functionReturnParameters": 23738, "id": 23746, "nodeType": "Return", "src": "3820:76:12" } ] }, "documentation": { "id": 23732, "nodeType": "StructuredDocumentation", "src": "3380:253:12", "text": " @dev Returns an Ethereum Signed Message, created from a `hash`. This\n replicates the behavior of the\n https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_sign[`eth_sign`]\n JSON-RPC method.\n See {recover}." }, "implemented": true, "kind": "function", "modifiers": [], "name": "toEthSignedMessageHash", "parameters": { "id": 23735, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 23734, "mutability": "mutable", "name": "hash", "nodeType": "VariableDeclaration", "scope": 23748, "src": "3670:12:12", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 23733, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "3670:7:12", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "visibility": "internal" } ], "src": "3669:14:12" }, "returnParameters": { "id": 23738, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 23737, "mutability": "mutable", "name": "", "nodeType": "VariableDeclaration", "scope": 23748, "src": "3707:7:12", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 23736, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "3707:7:12", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "visibility": "internal" } ], "src": "3706:9:12" }, "scope": 23749, "stateMutability": "pure", "virtual": false, "visibility": "internal" } ], "abstract": false, "baseContracts": [], "contractDependencies": [], "contractKind": "library", "documentation": { "id": 23636, "nodeType": "StructuredDocumentation", "src": "66:205:12", "text": " @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.\n These functions can be used to verify that a message was signed by the holder\n of the private keys of a given address." }, "fullyImplemented": true, "linearizedBaseContracts": [ 23749 ], "name": "ECDSA", "scope": 23750 } ], "license": "MIT" }, "id": 12 }