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"source": "pragma solidity ^0.4.24;\npragma experimental ABIEncoderV2;\n\n\ncontract SignaturesLibrary {\n\tbytes constant internal PREFIX = \"\\x19Ethereum Signed Message:\\n32\";\n\n\tstruct ECDSASignature {\n\t\tuint8 v;\n\t\tbytes32 r;\n\t\tbytes32 s;\n\t}\n\n\tfunction isValidSignature(\n\t\taddress signer,\n\t\tbytes32 hash,\n\t\tECDSASignature signature\n\t)\n\t\tpublic\n\t\tpure\n\t\treturns (bool valid)\n\t{\n\t\tbytes32 prefixedHash = keccak256(PREFIX, hash);\n\t\treturn ecrecover(prefixedHash, signature.v, signature.r, signature.s) == signer;\n\t}\n}\n", "sourcePath": "/Users/graemeboy/Dharma/experimental/contracts/src/shared/libraries/SignaturesLibrary.sol", "ast": { "absolutePath": "/Users/graemeboy/Dharma/experimental/contracts/src/shared/libraries/SignaturesLibrary.sol", "exportedSymbols": { "SignaturesLibrary": [ 1210 ] }, "id": 1211, "nodeType": "SourceUnit", "nodes": [ { "id": 1167, "literals": [ "solidity", "^", "0.4", ".24" ], "nodeType": "PragmaDirective", "src": "0:24:14" }, { "id": 1168, "literals": [ "experimental", "ABIEncoderV2" ], "nodeType": "PragmaDirective", "src": "25:33:14" }, { "baseContracts": [], "contractDependencies": [], "contractKind": "contract", "documentation": null, "fullyImplemented": true, "id": 1210, "linearizedBaseContracts": [ 1210 ], "name": "SignaturesLibrary", "nodeType": "ContractDefinition", "nodes": [ { "constant": true, "id": 1171, "name": "PREFIX", "nodeType": "VariableDeclaration", "scope": 1210, "src": "91:67:14", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes_memory", "typeString": "bytes" }, "typeName": { "id": 1169, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "91:5:14", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": { "argumentTypes": null, "hexValue": "19457468657265756d205369676e6564204d6573736167653a0a3332", "id": 1170, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "124:34:14", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_stringliteral_178a2411ab6fbc1ba11064408972259c558d0e82fd48b0aba3ad81d14f065e73", "typeString": "literal_string \"\u0019Ethereum Signed Message:\n32\"" }, "value": "\u0019Ethereum Signed Message:\n32" }, "visibility": "internal" }, { "canonicalName": "SignaturesLibrary.ECDSASignature", "id": 1178, "members": [ { "constant": false, "id": 1173, "name": "v", "nodeType": "VariableDeclaration", "scope": 1178, "src": "188:7:14", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "typeName": { "id": 1172, "name": "uint8", "nodeType": "ElementaryTypeName", "src": "188:5:14", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 1175, "name": "r", "nodeType": "VariableDeclaration", "scope": 1178, "src": "199:9:14", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 1174, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "199:7:14", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 1177, "name": "s", "nodeType": "VariableDeclaration", "scope": 1178, "src": "212:9:14", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 1176, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "212:7:14", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" } ], "name": "ECDSASignature", "nodeType": "StructDefinition", "scope": 1210, "src": "162:63:14", "visibility": "public" }, { "body": { "id": 1208, "nodeType": "Block", "src": "359:137:14", "statements": [ { "assignments": [ 1190 ], "declarations": [ { "constant": false, "id": 1190, "name": "prefixedHash", "nodeType": "VariableDeclaration", "scope": 1209, "src": "363:20:14", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 1189, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "363:7:14", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" } ], "id": 1195, "initialValue": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 1192, "name": "PREFIX", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 1171, "src": "396:6:14", "typeDescriptions": { "typeIdentifier": "t_bytes_memory", "typeString": "bytes memory" } }, { "argumentTypes": null, "id": 1193, "name": "hash", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 1182, "src": "404:4:14", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory", "typeString": "bytes memory" }, { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } ], "id": 1191, "name": "keccak256", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 1313, "src": "386:9:14", "typeDescriptions": { "typeIdentifier": "t_function_sha3_pure$__$returns$_t_bytes32_$", "typeString": "function () pure returns (bytes32)" } }, "id": 1194, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "386:23:14", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "nodeType": "VariableDeclarationStatement", "src": "363:46:14" }, { "expression": { "argumentTypes": null, "commonType": { 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returns (address)" } }, "id": 1204, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "420:62:14", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "BinaryOperation", "operator": "==", "rightExpression": { "argumentTypes": null, "id": 1205, "name": "signer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 1180, "src": "486:6:14", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "src": "420:72:14", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "functionReturnParameters": 1188, "id": 1207, "nodeType": "Return", "src": "413:79:14" } ] }, "documentation": null, "id": 1209, "implemented": true, "isConstructor": false, "isDeclaredConst": true, "modifiers": [], "name": "isValidSignature", "nodeType": "FunctionDefinition", "parameters": { "id": 1185, 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