블록체인/Ethernaut (20) 썸네일형 리스트형 [Ethernaut] 20. Denial 소스코드 // SPDX-License-Identifier: MIT pragma solidity ^0.6.0; import '@openzeppelin/contracts/math/SafeMath.sol'; contract Denial { using SafeMath for uint256; address public partner; // withdrawal partner - pay the gas, split the withdraw address payable public constant owner = address(0xA9E); uint timeLastWithdrawn; mapping(address => uint) withdrawPartnerBalances; // keep track of partners bal.. [Ethernaut] 19. Alien Codex 소스코드 // SPDX-License-Identifier: MIT pragma solidity ^0.5.0; import '../helpers/Ownable-05.sol'; contract AlienCodex is Ownable { bool public contact; bytes32[] public codex; modifier contacted() { assert(contact); _; } function make_contact() public { contact = true; } function record(bytes32 _content) contacted public { codex.push(_content); } function retract() contacted public { codex.length.. [Ethernaut] 18. MagicNumber 소스코드 // SPDX-License-Identifier: MIT pragma solidity ^0.6.0; contract MagicNum { address public solver; constructor() public {} function setSolver(address _solver) public { solver = _solver; } /* ____________/\\\_______/\\\\\\\\\_____ __________/\\\\\_____/\\\///////\\\___ ________/\\\/\\\____\///______\//\\\__ ______/\\\/\/\\\______________/\\\/___ ____/\\\/__\/\\\___________/\\\//_____ __/\\\\.. [Ethernaut] 17. Recovery 소스코드 // SPDX-License-Identifier: MIT pragma solidity ^0.6.0; import '@openzeppelin/contracts/math/SafeMath.sol'; contract Recovery { //generate tokens function generateToken(string memory _name, uint256 _initialSupply) public { new SimpleToken(_name, msg.sender, _initialSupply); } } contract SimpleToken { using SafeMath for uint256; // public variables string public name; mapping (address => uin.. [Ethernaut] 16. Preservation 소스코드 // SPDX-License-Identifier: MIT pragma solidity ^0.6.0; contract Preservation { // public library contracts address public timeZone1Library; address public timeZone2Library; address public owner; uint storedTime; // Sets the function signature for delegatecall bytes4 constant setTimeSignature = bytes4(keccak256("setTime(uint256)")); constructor(address _timeZone1LibraryAddress, address _tim.. [Ethernaut] 15. Naught Coin 소스코드 // SPDX-License-Identifier: MIT pragma solidity ^0.6.0; import '@openzeppelin/contracts/token/ERC20/ERC20.sol'; contract NaughtCoin is ERC20 { // string public constant name = 'NaughtCoin'; // string public constant symbol = '0x0'; // uint public constant decimals = 18; uint public timeLock = now + 10 * 365 days; uint256 public INITIAL_SUPPLY; address public player; constructor(address _pla.. [Ethernaut] 14. Gatekeeper Two 소스코드 // SPDX-License-Identifier: MIT pragma solidity ^0.6.0; contract GatekeeperTwo { address public entrant; modifier gateOne() { require(msg.sender != tx.origin); _; } modifier gateTwo() { uint x; assembly { x := extcodesize(caller()) } require(x == 0); _; } modifier gateThree(bytes8 _gateKey) { require(uint64(bytes8(keccak256(abi.encodePacked(msg.sender)))) ^ uint64(_gateKey) == uint64(0) - 1.. [Ethernaut] 13. Gatekeeper One 소스코드 // SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/math/SafeMath.sol"; contract GatekeeperOne { using SafeMath for uint256; address public entrant; uint256 i = uint256(uint160(address(tx.origin))); // over 0.8.0 solidity doesn't allow to convert address to uint so this line should be implemented... 이전 1 2 3 다음