{ "fileName": "ECDSA.sol", "contractName": "OpenZeppelinUpgradesECDSA", "source": "pragma solidity ^0.5.2;\n\n/**\n * @title Elliptic curve signature operations\n * @dev Based on https://gist.github.com/axic/5b33912c6f61ae6fd96d6c4a47afde6d\n * TODO Remove this library once solidity supports passing a signature to ecrecover.\n * See https://github.com/ethereum/solidity/issues/864\n *\n * Source https://raw.githubusercontent.com/OpenZeppelin/openzeppelin-solidity/79dd498b16b957399f84b9aa7e720f98f9eb83e3/contracts/cryptography/ECDSA.sol\n * This contract is copied here and renamed from the original to avoid clashes in the compiled artifacts\n * when the user imports a zos-lib contract (that transitively causes this contract to be compiled and added to the\n * build/artifacts folder) as well as the vanilla implementation from an openzeppelin version.\n */\n\nlibrary OpenZeppelinUpgradesECDSA {\n /**\n * @dev Recover signer address from a message by using their signature\n * @param hash bytes32 message, the hash is the signed message. What is recovered is the signer address.\n * @param signature bytes signature, the signature is generated using web3.eth.sign()\n */\n function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {\n // Check the signature length\n if (signature.length != 65) {\n return (address(0));\n }\n\n // Divide the signature in r, s and v variables\n bytes32 r;\n bytes32 s;\n uint8 v;\n\n // ecrecover takes the signature parameters, and the only way to get them\n // currently is to use assembly.\n // solhint-disable-next-line no-inline-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\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 (281): 0 < s < secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {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);\n }\n\n if (v != 27 && v != 28) {\n return address(0);\n }\n\n // If the signature is valid (and not malleable), return the signer address\n return ecrecover(hash, v, r, s);\n }\n\n /**\n * toEthSignedMessageHash\n * @dev prefix a bytes32 value with \"\\x19Ethereum Signed Message:\"\n * and hash the result\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", "sourcePath": "contracts/cryptography/ECDSA.sol", "sourceMap": "771:2638:5:-;;132:2:-1;166:7;155:9;146:7;137:37;252:7;246:14;243:1;238:23;232:4;229:33;270:1;265:20;;;;222:63;;265:20;274:9;222:63;;298:9;295:1;288:20;328:4;319:7;311:22;352:7;343;336:24", "deployedSourceMap": "771:2638:5:-;;;;;;;;", "abi": [], "ast": { "absolutePath": "contracts/cryptography/ECDSA.sol", "exportedSymbols": { "OpenZeppelinUpgradesECDSA": [ 874 ] }, "id": 875, "nodeType": "SourceUnit", "nodes": [ { "id": 795, "literals": [ "solidity", "^", "0.5", ".2" ], "nodeType": "PragmaDirective", "src": "0:23:5" }, { "baseContracts": [], "contractDependencies": [], "contractKind": "library", "documentation": "@title Elliptic curve signature operations\n@dev Based on https://gist.github.com/axic/5b33912c6f61ae6fd96d6c4a47afde6d\nTODO Remove this library once solidity supports passing a signature to ecrecover.\nSee https://github.com/ethereum/solidity/issues/864\n * Source https://raw.githubusercontent.com/OpenZeppelin/openzeppelin-solidity/79dd498b16b957399f84b9aa7e720f98f9eb83e3/contracts/cryptography/ECDSA.sol\nThis contract is copied here and renamed from the original to avoid clashes in the compiled artifacts\nwhen the user imports a zos-lib contract (that transitively causes this contract to be compiled and added to the\nbuild/artifacts folder) as well as the vanilla implementation from an openzeppelin version.", "fullyImplemented": true, "id": 874, "linearizedBaseContracts": [ 874 ], "name": "OpenZeppelinUpgradesECDSA", "nodeType": "ContractDefinition", "nodes": [ { "body": { "id": 856, "nodeType": "Block", "src": "1188:1804:5", "statements": [ { "condition": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 807, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "expression": { "argumentTypes": null, "id": 804, "name": "signature", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 799, "src": "1240:9:5", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 805, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "length", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "1240:16:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "argumentTypes": null, "hexValue": "3635", "id": 806, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "1260:2:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_65_by_1", "typeString": "int_const 65" }, "value": "65" }, "src": "1240:22:5", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "falseBody": null, "id": 814, "nodeType": "IfStatement", "src": "1236:72:5", "trueBody": { "id": 813, "nodeType": "Block", "src": "1264:44:5", "statements": [ { "expression": { "argumentTypes": null, "components": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "30", "id": 809, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "1294:1:5", "subdenomination": null, "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": 808, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "1286:7:5", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": "address" }, "id": 810, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1286:10:5", "typeDescriptions": { "typeIdentifier": "t_address_payable", "typeString": "address payable" } } ], "id": 811, "isConstant": false, "isInlineArray": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "TupleExpression", "src": "1285:12:5", "typeDescriptions": { "typeIdentifier": "t_address_payable", "typeString": "address payable" } }, "functionReturnParameters": 803, "id": 812, "nodeType": "Return", "src": "1278:19:5" } ] } }, { "assignments": [ 816 ], "declarations": [ { "constant": false, "id": 816, "name": "r", "nodeType": "VariableDeclaration", "scope": 856, "src": "1374:9:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 815, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "1374:7:5", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" } ], "id": 817, "initialValue": null, "nodeType": "VariableDeclarationStatement", "src": "1374:9:5" }, { "assignments": [ 819 ], "declarations": [ { "constant": false, "id": 819, "name": "s", "nodeType": "VariableDeclaration", "scope": 856, "src": "1393:9:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 818, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "1393:7:5", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" } ], "id": 820, "initialValue": null, "nodeType": "VariableDeclarationStatement", "src": "1393:9:5" }, { "assignments": [ 822 ], "declarations": [ { "constant": false, "id": 822, "name": "v", "nodeType": "VariableDeclaration", "scope": 856, "src": "1412:7:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "typeName": { "id": 821, "name": "uint8", "nodeType": "ElementaryTypeName", "src": "1412:5:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "value": null, "visibility": "internal" } ], "id": 823, "initialValue": null, "nodeType": "VariableDeclarationStatement", "src": "1412:7:5" }, { "externalReferences": [ { "r": { "declaration": 816, "isOffset": false, "isSlot": false, "src": "1632:1:5", "valueSize": 1 } }, { "v": { "declaration": 822, "isOffset": false, "isSlot": false, "src": "1722:1:5", "valueSize": 1 } }, { "signature": { "declaration": 799, "isOffset": false, "isSlot": false, "src": "1647:9:5", "valueSize": 1 } }, { "s": { "declaration": 819, "isOffset": false, "isSlot": false, "src": "1677:1:5", "valueSize": 1 } }, { "signature": { "declaration": 799, "isOffset": false, "isSlot": false, "src": "1692:9:5", "valueSize": 1 } }, { "signature": { "declaration": 799, "isOffset": false, "isSlot": false, "src": "1745:9:5", "valueSize": 1 } } ], "id": 824, "nodeType": "InlineAssembly", "operations": "{\n r := mload(add(signature, 0x20))\n s := mload(add(signature, 0x40))\n v := byte(0, mload(add(signature, 0x60)))\n}", "src": "1609:1050:5" }, { "condition": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 829, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 826, "name": "s", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 819, "src": "2669:1:5", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } ], "id": 825, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "2661:7:5", "typeDescriptions": { "typeIdentifier": "t_type$_t_uint256_$", "typeString": "type(uint256)" }, "typeName": "uint256" }, "id": 827, "isConstant": false, "isLValue": false, "isPure": false, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2661:10:5", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": ">", "rightExpression": { "argumentTypes": null, "hexValue": "307837464646464646464646464646464646464646464646464646464646464646463544353736453733353741343530314444464539324634363638314232304130", "id": 828, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "2674:66:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_57896044618658097711785492504343953926418782139537452191302581570759080747168_by_1", "typeString": "int_const 5789...(69 digits omitted)...7168" }, "value": "0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0" }, "src": "2661:79:5", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "falseBody": null, "id": 835, "nodeType": "IfStatement", "src": "2657:127:5", "trueBody": { "id": 834, "nodeType": "Block", "src": "2742:42:5", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "30", "id": 831, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "2771:1:5", "subdenomination": null, "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": 830, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "2763:7:5", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": "address" }, "id": 832, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2763:10:5", "typeDescriptions": { "typeIdentifier": "t_address_payable", "typeString": "address payable" } }, "functionReturnParameters": 803, "id": 833, "nodeType": "Return", "src": "2756:17:5" } ] } }, { "condition": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_bool", "typeString": "bool" }, "id": 842, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "id": 838, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 836, "name": "v", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 822, "src": "2798:1:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "argumentTypes": null, "hexValue": "3237", "id": 837, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "2803:2:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_27_by_1", "typeString": "int_const 27" }, "value": "27" }, "src": "2798:7:5", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "nodeType": "BinaryOperation", "operator": "&&", "rightExpression": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "id": 841, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 839, "name": "v", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 822, "src": "2809:1:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "argumentTypes": null, "hexValue": "3238", "id": 840, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "2814:2:5", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_28_by_1", "typeString": "int_const 28" }, "value": "28" }, "src": "2809:7:5", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "src": "2798:18:5", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "falseBody": null, "id": 848, "nodeType": "IfStatement", "src": "2794:66:5", "trueBody": { "id": 847, "nodeType": "Block", "src": "2818:42:5", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "30", "id": 844, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "2847:1:5", "subdenomination": null, "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": 843, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "2839:7:5", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": "address" }, "id": 845, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2839:10:5", "typeDescriptions": { "typeIdentifier": "t_address_payable", "typeString": "address payable" } }, "functionReturnParameters": 803, "id": 846, "nodeType": "Return", "src": "2832:17:5" } ] } }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 850, "name": "hash", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 797, "src": "2971:4:5", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, { "argumentTypes": null, "id": 851, "name": "v", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 822, "src": "2977:1:5", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, { "argumentTypes": null, "id": 852, "name": "r", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 816, "src": "2980:1:5", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, { "argumentTypes": null, "id": 853, "name": "s", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 819, "src": "2983:1:5", "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": 849, "name": "ecrecover", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6455, "src": "2961:9:5", "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": 854, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2961:24:5", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "functionReturnParameters": 803, "id": 855, "nodeType": "Return", "src": "2954:31:5" } ] }, "documentation": "@dev Recover signer address from a message by using their signature\n@param hash bytes32 message, the hash is the signed message. What is recovered is the signer address.\n@param signature bytes signature, the signature is generated using web3.eth.sign()", "id": 857, "implemented": true, "kind": "function", "modifiers": [], "name": "recover", "nodeType": "FunctionDefinition", "parameters": { "id": 800, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 797, "name": "hash", "nodeType": "VariableDeclaration", "scope": 857, "src": "1118:12:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 796, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "1118:7:5", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 799, "name": "signature", "nodeType": "VariableDeclaration", "scope": 857, "src": "1132:22:5", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 798, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "1132:5:5", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "1117:38:5" }, "returnParameters": { "id": 803, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 802, "name": "", "nodeType": "VariableDeclaration", "scope": 857, "src": "1179:7:5", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 801, "name": "address", "nodeType": "ElementaryTypeName", "src": "1179:7:5", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" } ], "src": "1178:9:5" }, "scope": 874, "src": "1101:1891:5", "stateMutability": "pure", "superFunction": 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