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"text": " @dev Returns the address that signed a hashed message (`hash`) with\n `signature` or error string. 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.\n Documentation for signature generation:\n - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]\n - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]\n _Available since v4.3._" }, "id": 13868, "implemented": true, "kind": "function", "modifiers": [], "name": "tryRecover", "nameLocation": "2154:10:26", "nodeType": "FunctionDefinition", "parameters": { "id": 13828, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 13825, "mutability": "mutable", "name": "hash", "nameLocation": "2173:4:26", "nodeType": "VariableDeclaration", "scope": 13868, "src": "2165:12:26", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 13824, "name": "bytes32", "nodeType": 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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." }, "id": 13895, "implemented": true, "kind": "function", "modifiers": [], "name": "recover", "nameLocation": "3670:7:26", "nodeType": "FunctionDefinition", "parameters": { "id": 13874, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 13871, "mutability": "mutable", "name": "hash", "nameLocation": "3686:4:26", "nodeType": "VariableDeclaration", "scope": 13895, "src": "3678:12:26", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 13870, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "3678:7:26", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "visibility": "internal" }, { "constant": false, "id": 13873, "mutability": "mutable", "name": "signature", 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[], "nodeType": "FunctionCall", "src": "4446:25:26", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$_t_address_$_t_enum$_RecoverError_$13778_$", "typeString": "tuple(address,enum ECDSA.RecoverError)" } }, "functionReturnParameters": 13909, "id": 13940, "nodeType": "Return", "src": "4439:32:26" } ] }, "documentation": { "id": 13896, "nodeType": "StructuredDocumentation", "src": "3894:243:26", "text": " @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.\n See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]\n _Available since v4.3._" }, "id": 13942, "implemented": true, "kind": "function", "modifiers": [], "name": "tryRecover", "nameLocation": "4151:10:26", "nodeType": "FunctionDefinition", "parameters": { "id": 13903, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 13898, "mutability": "mutable", "name": "hash", "nameLocation": "4179:4:26", "nodeType": "VariableDeclaration", "scope": 13942, "src": "4171:12:26", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 13897, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "4171:7:26", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "visibility": "internal" }, { "constant": false, "id": 13900, "mutability": "mutable", "name": "r", "nameLocation": "4201:1:26", "nodeType": "VariableDeclaration", "scope": 13942, "src": "4193:9:26", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 13899, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "4193:7:26", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "visibility": "internal" }, { "constant": false, "id": 13902, "mutability": "mutable", "name": "vs", "nameLocation": "4220:2:26", "nodeType": "VariableDeclaration", "scope": 13942, "src": "4212:10:26", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 13901, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "4212:7:26", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "visibility": "internal" } ], "src": "4161:67:26" }, "returnParameters": { "id": 13909, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 13905, "mutability": "mutable", "name": "", "nameLocation": "-1:-1:-1", "nodeType": "VariableDeclaration", "scope": 13942, "src": "4252:7:26", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 13904, "name": "address", "nodeType": "ElementaryTypeName", "src": "4252:7:26", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 13908, "mutability": "mutable", "name": "", "nameLocation": "-1:-1:-1", "nodeType": "VariableDeclaration", "scope": 13942, "src": "4261:12:26", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_enum$_RecoverError_$13778", "typeString": "enum ECDSA.RecoverError" }, "typeName": { "id": 13907, "nodeType": "UserDefinedTypeName", "pathNode": { "id": 13906, "name": "RecoverError", "nameLocations": [ "4261:12:26" ], "nodeType": "IdentifierPath", "referencedDeclaration": 13778, "src": "4261:12:26" }, "referencedDeclaration": 13778, "src": "4261:12:26", "typeDescriptions": { "typeIdentifier": "t_enum$_RecoverError_$13778", "typeString": "enum ECDSA.RecoverError" } }, "visibility": "internal" } ], "src": "4251:23:26" }, "scope": 14129, "src": "4142:336:26", "stateMutability": "pure", "virtual": false, "visibility": "internal" }, { "body": { "id": 13971, "nodeType": "Block", "src": "4759:136:26", "statements": [ { "assignments": [ 13955, 13958 ], "declarations": [ { "constant": false, "id": 13955, "mutability": "mutable", "name": "recovered", "nameLocation": "4778:9:26", "nodeType": "VariableDeclaration", "scope": 13971, "src": "4770:17:26", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 13954, "name": "address", "nodeType": "ElementaryTypeName", "src": "4770:7:26", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 13958, "mutability": "mutable", "name": "error", "nameLocation": "4802:5:26", "nodeType": "VariableDeclaration", "scope": 13971, "src": "4789:18:26", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_enum$_RecoverError_$13778", "typeString": "enum ECDSA.RecoverError" }, "typeName": { "id": 13957, "nodeType": "UserDefinedTypeName", "pathNode": { "id": 13956, "name": "RecoverError", "nameLocations": [ "4789:12:26" ], "nodeType": "IdentifierPath", "referencedDeclaration": 13778, "src": "4789:12:26" }, "referencedDeclaration": 13778, "src": "4789:12:26", "typeDescriptions": { "typeIdentifier": "t_enum$_RecoverError_$13778", "typeString": "enum ECDSA.RecoverError" } }, "visibility": "internal" } ], "id": 13964, "initialValue": { "arguments": [ { "id": 13960, "name": "hash", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 13945, "src": "4822:4:26", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, { "id": 13961, "name": "r", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 13947, "src": "4828:1:26", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, { "id": 13962, "name": "vs", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 13949, "src": "4831:2:26", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } ], "id": 13959, "name": "tryRecover", "nodeType": "Identifier", "overloadedDeclarations": [ 13868, 13942, 14036 ], "referencedDeclaration": 13942, "src": "4811:10:26", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes32_$_t_bytes32_$_t_bytes32_$returns$_t_address_$_t_enum$_RecoverError_$13778_$", "typeString": "function (bytes32,bytes32,bytes32) pure returns (address,enum ECDSA.RecoverError)" } }, "id": 13963, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "4811:23:26", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$_t_address_$_t_enum$_RecoverError_$13778_$", "typeString": "tuple(address,enum ECDSA.RecoverError)" } }, "nodeType": "VariableDeclarationStatement", "src": "4769:65:26" }, { "expression": { "arguments": [ { "id": 13966, "name": "error", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 13958, "src": "4856:5:26", "typeDescriptions": { "typeIdentifier": "t_enum$_RecoverError_$13778", "typeString": "enum ECDSA.RecoverError" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_enum$_RecoverError_$13778", "typeString": "enum ECDSA.RecoverError" } ], "id": 13965, "name": "_throwError", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 13822, "src": "4844:11:26", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_enum$_RecoverError_$13778_$returns$__$", "typeString": "function (enum ECDSA.RecoverError) pure" } }, "id": 13967, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "4844:18:26", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 13968, "nodeType": "ExpressionStatement", "src": "4844:18:26" }, { "expression": { "id": 13969, "name": "recovered", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 13955, "src": "4879:9:26", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "functionReturnParameters": 13953, "id": 13970, "nodeType": "Return", "src": "4872:16:26" } ] }, "documentation": { "id": 13943, "nodeType": "StructuredDocumentation", "src": "4484:154:26", "text": " @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.\n _Available since v4.2._" }, "id": 13972, "implemented": true, "kind": "function", "modifiers": [], "name": "recover", "nameLocation": "4652:7:26", "nodeType": "FunctionDefinition", "parameters": { "id": 13950, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 13945, "mutability": "mutable", "name": "hash", "nameLocation": "4677:4:26", "nodeType": "VariableDeclaration", "scope": 13972, "src": "4669:12:26", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 13944, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "4669:7:26", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "visibility": "internal" }, { "constant": false, "id": 13947, "mutability": "mutable", "name": "r", "nameLocation": "4699:1:26", "nodeType": "VariableDeclaration", "scope": 13972, "src": "4691:9:26", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 13946, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "4691:7:26", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "visibility": "internal" }, { "constant": false, "id": 13949, "mutability": "mutable", "name": "vs", "nameLocation": "4718:2:26", "nodeType": "VariableDeclaration", "scope": 13972, "src": "4710:10:26", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 13948, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "4710:7:26", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "visibility": "internal" } ], "src": "4659:67:26" }, "returnParameters": { "id": 13953, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 13952, "mutability": "mutable", "name": "", "nameLocation": "-1:-1:-1", "nodeType": "VariableDeclaration", "scope": 13972, "src": "4750:7:26", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 13951, "name": "address", "nodeType": "ElementaryTypeName", "src": "4750:7:26", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" } ], "src": "4749:9:26" }, "scope": 14129, "src": "4643:252:26", "stateMutability": "pure", "virtual": false, "visibility": "internal" }, { "body": { "id": 14035, "nodeType": "Block", "src": "5218:1345:26", "statements": [ { "condition": { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 13994, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "arguments": [ { "id": 13991, "name": "s", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 13981, "src": "6114:1:26", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } ], "id": 13990, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "6106:7:26", "typeDescriptions": { "typeIdentifier": "t_type$_t_uint256_$", "typeString": "type(uint256)" }, "typeName": { "id": 13989, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "6106:7:26", "typeDescriptions": {} } }, "id": 13992, "isConstant": false, "isLValue": false, "isPure": false, "kind": "typeConversion", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "6106:10:26", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": ">", "rightExpression": { "hexValue": "307837464646464646464646464646464646464646464646464646464646464646463544353736453733353741343530314444464539324634363638314232304130", "id": 13993, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "6119:66:26", "typeDescriptions": { "typeIdentifier": "t_rational_57896044618658097711785492504343953926418782139537452191302581570759080747168_by_1", "typeString": "int_const 5789...(69 digits omitted)...7168" }, "value": "0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0" }, "src": "6106:79:26", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "id": 14004, "nodeType": "IfStatement", "src": "6102:161:26", "trueBody": { "id": 14003, "nodeType": "Block", "src": "6187:76:26", "statements": [ { "expression": { "components": [ { "arguments": [ { "hexValue": "30", "id": 13997, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "6217:1:26", "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": 13996, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "6209:7:26", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 13995, "name": "address", "nodeType": "ElementaryTypeName", "src": "6209:7:26", "typeDescriptions": {} } }, "id": 13998, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "6209:10:26", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "expression": { "id": 13999, "name": "RecoverError", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 13778, "src": "6221:12:26", "typeDescriptions": { "typeIdentifier": "t_type$_t_enum$_RecoverError_$13778_$", "typeString": "type(enum ECDSA.RecoverError)" } }, "id": 14000, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "memberLocation": "6234:17:26", "memberName": "InvalidSignatureS", "nodeType": "MemberAccess", "referencedDeclaration": 13776, "src": "6221:30:26", "typeDescriptions": { "typeIdentifier": "t_enum$_RecoverError_$13778", "typeString": "enum ECDSA.RecoverError" } } ], "id": 14001, "isConstant": false, "isInlineArray": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "TupleExpression", "src": "6208:44:26", "typeDescriptions": { "typeIdentifier": "t_tuple$_t_address_$_t_enum$_RecoverError_$13778_$", "typeString": "tuple(address,enum ECDSA.RecoverError)" } }, "functionReturnParameters": 13988, "id": 14002, "nodeType": "Return", "src": "6201:51:26" } ] } }, { "assignments": [ 14006 ], "declarations": [ { "constant": false, "id": 14006, "mutability": "mutable", "name": "signer", "nameLocation": "6365:6:26", "nodeType": "VariableDeclaration", "scope": 14035, "src": "6357:14:26", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 14005, "name": "address", "nodeType": "ElementaryTypeName", "src": "6357:7:26", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" } ], "id": 14013, "initialValue": { "arguments": [ { "id": 14008, "name": "hash", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 13975, "src": "6384:4:26", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, { "id": 14009, "name": "v", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 13977, "src": "6390:1:26", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, { "id": 14010, "name": "r", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 13979, "src": "6393:1:26", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, { "id": 14011, "name": "s", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 13981, "src": "6396:1:26", "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": 14007, "name": "ecrecover", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": -6, "src": "6374:9:26", 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"typeString": "address" } }, "nodeType": "BinaryOperation", "operator": "==", "rightExpression": { "arguments": [ { "hexValue": "30", "id": 14017, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "6430:1:26", "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": 14016, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "6422:7:26", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 14015, "name": "address", "nodeType": "ElementaryTypeName", "src": "6422:7:26", "typeDescriptions": {} } }, "id": 14018, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", 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This\n produces hash corresponding to the one signed with the\n https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]\n JSON-RPC method as part of EIP-191.\n See {recover}." }, "id": 14086, "implemented": true, "kind": "function", "modifiers": [], "name": "toEthSignedMessageHash", "nameLocation": "7265:22:26", "nodeType": "FunctionDefinition", "parameters": { "id": 14073, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 14072, "mutability": "mutable", "name": "hash", "nameLocation": "7296:4:26", "nodeType": "VariableDeclaration", "scope": 14086, "src": "7288:12:26", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 14071, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "7288:7:26", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "visibility": "internal" } ], "src": "7287:14:26" }, "returnParameters": { "id": 14076, 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These functions can be used to verify that a message was signed by the holder of the private keys of a given address.", "kind": "dev", "methods": {}, "version": 1 }, "offset": [ 369, 8537 ], "opcodes": "PUSH20 0x0 ADDRESS EQ PUSH1 0x80 PUSH1 0x40 MSTORE PUSH1 0x0 DUP1 REVERT INVALID LOG2 PUSH5 0x6970667358 0x22 SLT KECCAK256 BLOCKHASH PUSH19 0x461F84A6BFFB23B998D54841EA1150062E5F54 0x49 LOG4 DUP15 DUP8 0xBF DELEGATECALL 0x2E 0x5C 0x25 0xAB CALLDATASIZE PUSH5 0x736F6C6343 STOP ADDMOD SGT STOP CALLER ", "pcMap": { "0": { "offset": [ 369, 8537 ], "op": "PUSH20", "path": "26", "value": "0x0" }, "21": { "fn": null, "offset": [ 369, 8537 ], "op": "ADDRESS", "path": "26" }, "22": { "fn": null, "offset": [ 369, 8537 ], "op": "EQ", "path": "26" }, "23": { "fn": null, "offset": [ 369, 8537 ], "op": "PUSH1", "path": "26", "value": "0x80" }, "25": { "fn": null, "offset": [ 369, 8537 ], "op": "PUSH1", "path": "26", "value": "0x40" }, "27": { "fn": null, "offset": [ 369, 8537 ], "op": "MSTORE", "path": "26" }, "28": { "fn": null, "offset": [ 369, 8537 ], "op": "PUSH1", "path": "26", "value": "0x0" }, "30": { "fn": null, "offset": [ 369, 8537 ], "op": "DUP1", "path": "26" }, "31": { "fn": null, "offset": [ 369, 8537 ], "op": "REVERT", "path": "26" } }, "sha1": "843d5816e66f91e31e34c6ae3feb09871f50810a", "source": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.8.0) (utils/cryptography/ECDSA.sol)\n\npragma solidity ^0.8.0;\n\nimport \"../Strings.sol\";\n\n/**\n * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.\n *\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.\n */\nlibrary ECDSA {\n enum RecoverError {\n NoError,\n InvalidSignature,\n InvalidSignatureLength,\n InvalidSignatureS,\n InvalidSignatureV // Deprecated in v4.8\n }\n\n function _throwError(RecoverError error) private pure {\n if (error == RecoverError.NoError) {\n return; // no error: do nothing\n } else if (error == RecoverError.InvalidSignature) {\n revert(\"ECDSA: invalid signature\");\n } else if (error == RecoverError.InvalidSignatureLength) {\n revert(\"ECDSA: invalid signature length\");\n } else if (error == RecoverError.InvalidSignatureS) {\n revert(\"ECDSA: invalid signature 's' value\");\n }\n }\n\n /**\n * @dev Returns the address that signed a hashed message (`hash`) with\n * `signature` or error string. This address can then be used for verification purposes.\n *\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 *\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.\n *\n * Documentation for signature generation:\n * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]\n * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]\n *\n * _Available since v4.3._\n */\n function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) {\n if (signature.length == 65) {\n bytes32 r;\n bytes32 s;\n uint8 v;\n // ecrecover takes the signature parameters, and the only way to get them\n // currently is to use assembly.\n /// @solidity memory-safe-assembly\n assembly {\n r := mload(add(signature, 0x20))\n s := mload(add(signature, 0x40))\n v := byte(0, mload(add(signature, 0x60)))\n }\n return tryRecover(hash, v, r, s);\n } else {\n return (address(0), RecoverError.InvalidSignatureLength);\n }\n }\n\n /**\n * @dev Returns the address that signed a hashed message (`hash`) with\n * `signature`. This address can then be used for verification purposes.\n *\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 *\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.\n */\n function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {\n (address recovered, RecoverError error) = tryRecover(hash, signature);\n _throwError(error);\n return recovered;\n }\n\n /**\n * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.\n *\n * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]\n *\n * _Available since v4.3._\n */\n function tryRecover(\n bytes32 hash,\n bytes32 r,\n bytes32 vs\n ) internal pure returns (address, RecoverError) {\n bytes32 s = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff);\n uint8 v = uint8((uint256(vs) >> 255) + 27);\n return tryRecover(hash, v, r, s);\n }\n\n /**\n * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.\n *\n * _Available since v4.2._\n */\n function recover(\n bytes32 hash,\n bytes32 r,\n bytes32 vs\n ) internal pure returns (address) {\n (address recovered, RecoverError error) = tryRecover(hash, r, vs);\n _throwError(error);\n return recovered;\n }\n\n /**\n * @dev Overload of {ECDSA-tryRecover} that receives the `v`,\n * `r` and `s` signature fields separately.\n *\n * _Available since v4.3._\n */\n function tryRecover(\n bytes32 hash,\n uint8 v,\n bytes32 r,\n bytes32 s\n ) internal pure returns (address, RecoverError) {\n // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature\n // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines\n // the valid range for s in (301): 0 < s < secp256k1n \u00f7 2 + 1, and for v in (302): v \u2208 {27, 28}. Most\n // signatures from current libraries generate a unique signature with an s-value in the lower half order.\n //\n // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value\n // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or\n // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept\n // these malleable signatures as well.\n if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {\n return (address(0), RecoverError.InvalidSignatureS);\n }\n\n // If the signature is valid (and not malleable), return the signer address\n address signer = ecrecover(hash, v, r, s);\n if (signer == address(0)) {\n return (address(0), RecoverError.InvalidSignature);\n }\n\n return (signer, RecoverError.NoError);\n }\n\n /**\n * @dev Overload of {ECDSA-recover} that receives the `v`,\n * `r` and `s` signature fields separately.\n */\n function recover(\n bytes32 hash,\n uint8 v,\n bytes32 r,\n bytes32 s\n ) internal pure returns (address) {\n (address recovered, RecoverError error) = tryRecover(hash, v, r, s);\n _throwError(error);\n return recovered;\n }\n\n /**\n * @dev Returns an Ethereum Signed Message, created from a `hash`. This\n * produces hash corresponding to the one signed with the\n * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]\n * JSON-RPC method as part of EIP-191.\n *\n * See {recover}.\n */\n function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) {\n // 32 is the length in bytes of hash,\n // enforced by the type signature above\n return keccak256(abi.encodePacked(\"\\x19Ethereum Signed Message:\\n32\", hash));\n }\n\n /**\n * @dev Returns an Ethereum Signed Message, created from `s`. This\n * produces hash corresponding to the one signed with the\n * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]\n * JSON-RPC method as part of EIP-191.\n *\n * See {recover}.\n */\n function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32) {\n return keccak256(abi.encodePacked(\"\\x19Ethereum Signed Message:\\n\", Strings.toString(s.length), s));\n }\n\n /**\n * @dev Returns an Ethereum Signed Typed Data, created from a\n * `domainSeparator` and a `structHash`. This produces hash corresponding\n * to the one signed with the\n * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]\n * JSON-RPC method as part of EIP-712.\n *\n * See {recover}.\n */\n function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) {\n return keccak256(abi.encodePacked(\"\\x19\\x01\", domainSeparator, structHash));\n }\n}\n", "sourceMap": "369:8168:26:-:0;;;;;;;;;;;;;;;-1:-1:-1;;;369:8168:26;;;;;;;;;;;;;;;;;", "sourcePath": "/home/vscode/.brownie/packages/OpenZeppelin/openzeppelin-contracts@4.8.2/contracts/utils/cryptography/ECDSA.sol", "type": "library" }