{ "fileName": "ECDSA.sol", "contractName": "ECDSA", "source": "pragma solidity ^0.6.0;\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 /**\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 // Check the signature length\n if (signature.length != 65) {\n revert(\"ECDSA: invalid signature length\");\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 revert(\"ECDSA: invalid signature 's' value\");\n }\n\n if (v != 27 && v != 28) {\n revert(\"ECDSA: invalid signature 'v' value\");\n }\n\n // If the signature is valid (and not malleable), return the signer address\n address signer = ecrecover(hash, v, r, s);\n require(signer != address(0), \"ECDSA: invalid signature\");\n\n return signer;\n }\n\n /**\n * @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 *\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", "sourcePath": "contracts/cryptography/ECDSA.sol", "sourceMap": "231:3399:9:-:0;;132:2:-1;166:7;155:9;146:7;137:37;255:7;249:14;246:1;241:23;235:4;232:33;222:2;;269:9;222:2;293:9;290:1;283:20;323:4;314:7;306:22;347:7;338;331:24", "deployedSourceMap": "231:3399:9:-:0;;;;;;12:1:-1;9;2:12", "abi": [], "ast": { "absolutePath": "contracts/cryptography/ECDSA.sol", "exportedSymbols": { "ECDSA": [ 1925 ] }, "id": 1926, "nodeType": "SourceUnit", "nodes": [ { "id": 1829, "literals": [ "solidity", "^", "0.6", ".0" ], "nodeType": "PragmaDirective", "src": "0:23:9" }, { "abstract": 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"name": "signer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 1886, "src": "3019:6:9", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "30", "id": 1898, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "3037:1:9", "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": 1897, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "3029:7:9", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": 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"3011:57:9" }, { "expression": { "argumentTypes": null, "id": 1904, "name": "signer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 1886, "src": "3086:6:9", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "functionReturnParameters": 1839, "id": 1905, "nodeType": "Return", "src": "3079:13:9" } ] }, "documentation": { "id": 1831, "nodeType": "StructuredDocumentation", "src": "251:775:9", "text": "@dev Returns the address that signed a hashed message (`hash`) with\n`signature`. This address can then be used for verification purposes.\n * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:\nthis function rejects them by requiring the `s` value to be in the lower\nhalf order, and the `v` value to be either 27 or 28.\n * IMPORTANT: `hash` _must_ be the result of a hash operation for the\nverification to be secure: it is possible to craft signatures that\nrecover to arbitrary addresses for non-hashed data. A safe way to ensure\nthis is by receiving a hash of the original message (which may otherwise\nbe too long), and then calling {toEthSignedMessageHash} on it." }, "id": 1907, "implemented": true, "kind": "function", "modifiers": [], "name": "recover", "nodeType": "FunctionDefinition", "overrides": null, "parameters": { "id": 1836, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 1833, "mutability": "mutable", "name": "hash", "nodeType": "VariableDeclaration", "overrides": null, "scope": 1907, "src": "1048:12:9", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 1832, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "1048:7:9", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 1835, "mutability": "mutable", "name": "signature", "nodeType": "VariableDeclaration", "overrides": null, "scope": 1907, "src": "1062:22:9", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 1834, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "1062:5:9", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "1047:38:9" }, "returnParameters": { "id": 1839, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 1838, "mutability": "mutable", "name": "", "nodeType": "VariableDeclaration", "overrides": null, "scope": 1907, "src": "1109:7:9", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 1837, "name": "address", "nodeType": "ElementaryTypeName", "src": "1109:7:9", "stateMutability": "nonpayable", "typeDescriptions": { 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"nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 1910, "src": "3615:4:9", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_stringliteral_178a2411ab6fbc1ba11064408972259c558d0e82fd48b0aba3ad81d14f065e73", "typeString": "literal_string \"\u0019Ethereum Signed Message:\n32\"" }, { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } ], "expression": { "argumentTypes": null, "id": 1916, "name": "abi", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": -1, "src": "3562:3:9", "typeDescriptions": { "typeIdentifier": "t_magic_abi", "typeString": "abi" } }, "id": 1917, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "memberName": "encodePacked", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "3562:16:9", "typeDescriptions": { "typeIdentifier": "t_function_abiencodepacked_pure$__$returns$_t_bytes_memory_ptr_$", "typeString": "function () pure returns (bytes memory)" } }, "id": 1920, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "3562:58:9", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 1915, "name": "keccak256", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": -8, "src": "3552:9:9", "typeDescriptions": { "typeIdentifier": "t_function_keccak256_pure$_t_bytes_memory_ptr_$returns$_t_bytes32_$", "typeString": "function (bytes memory) pure returns (bytes32)" } }, "id": 1921, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "3552:69:9", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "functionReturnParameters": 1914, "id": 1922, "nodeType": "Return", "src": "3545:76:9" } ] }, "documentation": { "id": 1908, "nodeType": "StructuredDocumentation", "src": "3105:253:9", "text": "@dev Returns an Ethereum Signed Message, created from a `hash`. This\nreplicates the behavior of the\nhttps://github.com/ethereum/wiki/wiki/JSON-RPC#eth_sign[`eth_sign`]\nJSON-RPC method.\n * See {recover}." }, "id": 1924, "implemented": true, "kind": "function", "modifiers": [], "name": "toEthSignedMessageHash", "nodeType": "FunctionDefinition", "overrides": null, "parameters": { "id": 1911, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 1910, "mutability": "mutable", "name": "hash", "nodeType": "VariableDeclaration", "overrides": null, "scope": 1924, "src": "3395:12:9", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 1909, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "3395:7:9", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" } ], "src": "3394:14:9" }, "returnParameters": { "id": 1914, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 1913, "mutability": "mutable", "name": "", "nodeType": "VariableDeclaration", "overrides": null, "scope": 1924, "src": "3432:7:9", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 1912, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "3432:7:9", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" } ], "src": "3431:9:9" }, "scope": 1925, "src": "3363:265:9", "stateMutability": "pure", "virtual": false, "visibility": "internal" } ], "scope": 1926, "src": "231:3399:9" } ], "src": "0:3631:9" }, "bytecode": "0x60566023600b82828239805160001a607314601657fe5b30600052607381538281f3fe73000000000000000000000000000000000000000030146080604052600080fdfea2646970667358221220991bd127a3763ad442c54f48567cddb0e9841158f7ff4e8c6f223daa285b29cc64736f6c63430006070033", "deployedBytecode": "0x73000000000000000000000000000000000000000030146080604052600080fdfea2646970667358221220991bd127a3763ad442c54f48567cddb0e9841158f7ff4e8c6f223daa285b29cc64736f6c63430006070033", "compiler": { "name": "solc", "version": "0.6.7+commit.b8d736ae.Emscripten.clang", "optimizer": { "enabled": true, "runs": 200 }, "evmVersion": "petersburg" } }