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"source": "pragma solidity ^0.5.0;\n\nimport \"./Algorithm.sol\";\nimport \"../BytesUtils.sol\";\nimport \"elliptic-solidity/contracts/curves/EllipticCurve.sol\";\n\ncontract SHA256P256Algorithm is Algorithm {\n\n using BytesUtils for *;\n\n EllipticCurve public curve;\n\n constructor(EllipticCurve _curve) public {\n curve = _curve;\n }\n\n /**\n * @dev Verifies a signature.\n * @param key The public key to verify with.\n * @param data The signed data to verify.\n * @param signature The signature to verify.\n * @return True iff the signature is valid.\n */\n function verify(bytes calldata key, bytes calldata data, bytes calldata signature) external view returns (bool) {\n return curve.validateSignature(sha256(data), parseSignature(signature), parseKey(key));\n }\n\n function parseSignature(bytes memory data) internal pure returns (uint256[2] memory) {\n return [uint256(data.readBytes32(0)), uint256(data.readBytes32(32))];\n }\n\n function parseKey(bytes memory data) internal pure returns (uint256[2] memory) {\n return [uint256(data.readBytes32(4)), uint256(data.readBytes32(36))];\n }\n}\n", "sourcePath": "/home/user/Dropbox/projects/enssec/contracts/algorithms/SHA256P256Algorithm.sol", "ast": { "absolutePath": "/home/user/Dropbox/projects/enssec/contracts/algorithms/SHA256P256Algorithm.sol", "exportedSymbols": { "SHA256P256Algorithm": [ 3622 ] }, "id": 3623, "nodeType": "SourceUnit", "nodes": [ { "id": 3529, "literals": [ "solidity", "^", "0.5", ".0" ], "nodeType": "PragmaDirective", "src": "0:23:12" }, { "absolutePath": "/home/user/Dropbox/projects/enssec/contracts/algorithms/Algorithm.sol", "file": "./Algorithm.sol", "id": 3530, "nodeType": "ImportDirective", "scope": 3623, "sourceUnit": 3125, "src": "25:25:12", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "/home/user/Dropbox/projects/enssec/contracts/BytesUtils.sol", "file": "../BytesUtils.sol", "id": 3531, "nodeType": "ImportDirective", "scope": 3623, "sourceUnit": 721, "src": "51:27:12", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "elliptic-solidity/contracts/curves/EllipticCurve.sol", "file": "elliptic-solidity/contracts/curves/EllipticCurve.sol", "id": 3532, "nodeType": "ImportDirective", "scope": 3623, "sourceUnit": 5647, "src": "79:62:12", "symbolAliases": [], "unitAlias": "" }, { "baseContracts": [ { "arguments": null, "baseName": { "contractScope": null, "id": 3533, "name": "Algorithm", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 3124, "src": "175:9:12", "typeDescriptions": { "typeIdentifier": "t_contract$_Algorithm_$3124", "typeString": "contract Algorithm" } }, "id": 3534, "nodeType": "InheritanceSpecifier", "src": "175:9:12" } ], "contractDependencies": [ 3124 ], "contractKind": "contract", "documentation": null, "fullyImplemented": true, "id": 3622, "linearizedBaseContracts": [ 3622, 3124 ], "name": "SHA256P256Algorithm", "nodeType": "ContractDefinition", "nodes": [ { "id": 3536, "libraryName": { "contractScope": null, "id": 3535, "name": "BytesUtils", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 720, "src": "198:10:12", "typeDescriptions": { "typeIdentifier": "t_contract$_BytesUtils_$720", "typeString": "library BytesUtils" } }, "nodeType": "UsingForDirective", "src": "192:23:12", "typeName": null }, { "constant": false, "id": 3538, "name": "curve", "nodeType": "VariableDeclaration", "scope": 3622, "src": "221:26:12", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_contract$_EllipticCurve_$5646", "typeString": "contract EllipticCurve" }, "typeName": { "contractScope": null, "id": 3537, "name": "EllipticCurve", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 5646, "src": "221:13:12", "typeDescriptions": { "typeIdentifier": "t_contract$_EllipticCurve_$5646", "typeString": "contract EllipticCurve" } }, "value": null, "visibility": "public" }, { "body": { "id": 3547, "nodeType": "Block", "src": "295:31:12", "statements": [ { "expression": { "argumentTypes": null, "id": 3545, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "id": 3543, "name": "curve", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3538, "src": "305:5:12", "typeDescriptions": { "typeIdentifier": "t_contract$_EllipticCurve_$5646", "typeString": "contract EllipticCurve" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "id": 3544, "name": "_curve", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3540, "src": "313:6:12", "typeDescriptions": { "typeIdentifier": "t_contract$_EllipticCurve_$5646", "typeString": "contract EllipticCurve" } }, "src": "305:14:12", "typeDescriptions": { "typeIdentifier": "t_contract$_EllipticCurve_$5646", "typeString": "contract EllipticCurve" } }, "id": 3546, "nodeType": "ExpressionStatement", "src": "305:14:12" } ] }, "documentation": null, "id": 3548, "implemented": true, "kind": "constructor", "modifiers": [], "name": "", "nodeType": "FunctionDefinition", "parameters": { "id": 3541, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3540, "name": "_curve", "nodeType": "VariableDeclaration", "scope": 3548, "src": "266:20:12", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_contract$_EllipticCurve_$5646", "typeString": "contract EllipticCurve" }, "typeName": { "contractScope": null, "id": 3539, "name": "EllipticCurve", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 5646, "src": "266:13:12", "typeDescriptions": { "typeIdentifier": "t_contract$_EllipticCurve_$5646", "typeString": "contract EllipticCurve" } }, "value": null, "visibility": "internal" } ], "src": "265:22:12" }, "returnParameters": { "id": 3542, "nodeType": "ParameterList", "parameters": [], "src": "295:0:12" }, "scope": 3622, "src": "254:72:12", "stateMutability": "nonpayable", "superFunction": null, "visibility": "public" }, { "body": { "id": 3572, "nodeType": "Block", "src": "680:103:12", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3562, "name": "data", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3552, "src": "728:4:12", "typeDescriptions": { "typeIdentifier": "t_bytes_calldata_ptr", "typeString": "bytes calldata" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_calldata_ptr", "typeString": "bytes calldata" } ], "id": 3561, "name": "sha256", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5670, "src": "721:6:12", "typeDescriptions": { "typeIdentifier": "t_function_sha256_pure$_t_bytes_memory_ptr_$returns$_t_bytes32_$", "typeString": "function (bytes memory) pure returns (bytes32)" } }, "id": 3563, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "721:12:12", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" } }, { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3565, "name": "signature", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3554, "src": "750:9:12", "typeDescriptions": { "typeIdentifier": "t_bytes_calldata_ptr", "typeString": "bytes calldata" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_calldata_ptr", "typeString": "bytes calldata" } ], "id": 3564, "name": "parseSignature", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3597, "src": "735:14:12", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_array$_t_uint256_$2_memory_ptr_$", "typeString": "function (bytes memory) pure returns (uint256[2] memory)" } }, "id": 3566, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "735:25:12", "typeDescriptions": { "typeIdentifier": "t_array$_t_uint256_$2_memory_ptr", "typeString": "uint256[2] memory" } }, { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3568, "name": "key", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3550, "src": "771:3:12", "typeDescriptions": { "typeIdentifier": "t_bytes_calldata_ptr", "typeString": "bytes calldata" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_calldata_ptr", "typeString": "bytes calldata" } ], "id": 3567, "name": "parseKey", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3621, "src": "762:8:12", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$returns$_t_array$_t_uint256_$2_memory_ptr_$", "typeString": "function (bytes memory) pure 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