{ "fileName": "ECDSA.sol", "contractName": "ECDSA", "source": "// SPDX-License-Identifier: MIT\n\npragma solidity ^0.7.0;\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": "264:3399:8:-:0;;;;;;;;;;;;;;;;;;;;;;;;;", "deployedSourceMap": "264:3399:8:-:0;;;;;;;;", "abi": [], "ast": { "absolutePath": "contracts/cryptography/ECDSA.sol", "exportedSymbols": { "ECDSA": [ 1674 ] }, "id": 1675, "license": "MIT", "nodeType": "SourceUnit", "nodes": [ { "id": 1578, "literals": [ "solidity", "^", "0.7", ".0" ], "nodeType": "PragmaDirective", "src": "33:23:8" }, { "abstract": false, "baseContracts": [], "contractDependencies": [], "contractKind": "library", "documentation": { "id": 1579, 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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": 1656, "implemented": true, "kind": "function", "modifiers": [], "name": "recover", "nodeType": "FunctionDefinition", "overrides": null, "parameters": { "id": 1585, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 1582, "mutability": "mutable", "name": "hash", "nodeType": "VariableDeclaration", "overrides": null, "scope": 1656, "src": "1081:12:8", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 1581, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "1081:7:8", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 1584, "mutability": "mutable", "name": "signature", "nodeType": 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"t_function_abiencodepacked_pure$__$returns$_t_bytes_memory_ptr_$", "typeString": "function () pure returns (bytes memory)" } }, "id": 1669, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "3595:58:8", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 1664, "name": "keccak256", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": -8, "src": "3585:9:8", "typeDescriptions": { "typeIdentifier": "t_function_keccak256_pure$_t_bytes_memory_ptr_$returns$_t_bytes32_$", "typeString": "function (bytes memory) pure returns (bytes32)" } }, "id": 1670, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "3585:69:8", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "functionReturnParameters": 1663, "id": 1671, "nodeType": "Return", "src": "3578:76:8" } ] }, "documentation": { "id": 1657, "nodeType": "StructuredDocumentation", "src": "3138:253:8", "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}." }, "id": 1673, "implemented": true, "kind": "function", "modifiers": [], "name": "toEthSignedMessageHash", "nodeType": "FunctionDefinition", "overrides": null, "parameters": { "id": 1660, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 1659, "mutability": "mutable", "name": "hash", "nodeType": "VariableDeclaration", "overrides": null, "scope": 1673, "src": "3428:12:8", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 1658, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "3428:7:8", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" } ], "src": "3427:14:8" }, "returnParameters": { "id": 1663, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 1662, "mutability": "mutable", "name": "", "nodeType": "VariableDeclaration", "overrides": null, "scope": 1673, "src": "3465:7:8", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 1661, "name": "bytes32", "nodeType": "ElementaryTypeName", "src": "3465:7:8", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, "value": null, "visibility": "internal" } ], "src": "3464:9:8" }, "scope": 1674, "src": "3396:265:8", "stateMutability": "pure", "virtual": false, "visibility": "internal" } ], "scope": 1675, "src": "264:3399:8" } ], "src": "33:3631:8" }, "bytecode": "0x60566023600b82828239805160001a607314601657fe5b30600052607381538281f3fe73000000000000000000000000000000000000000030146080604052600080fdfea26469706673582212205634ff86def5596cc5624b7b492de23be39af0514f3f395d16a0124318f3622364736f6c63430007000033", "deployedBytecode": "0x73000000000000000000000000000000000000000030146080604052600080fdfea26469706673582212205634ff86def5596cc5624b7b492de23be39af0514f3f395d16a0124318f3622364736f6c63430007000033", "compiler": { "name": "solc", "version": "0.7.0+commit.9e61f92b.Emscripten.clang", "optimizer": { "enabled": false, "runs": 200 }, "evmVersion": "petersburg" } }