Write Up/Ethernaut - 블록체인 워게임18 Ethernaut - 17단계 (Recovery) // SPDX-License-Identifier: MIT pragma solidity ^0.8.0; contract Recovery { //generate tokens function generateToken(string memory _name, uint256 _initialSupply) public { new SimpleToken(_name, msg.sender, _initialSupply); } } contract SimpleToken { string public name; mapping (address => uint) public balances; // constructor constructor(string memory _name, address _creator, uint256 _initialSup.. 2023. 11. 28. Ethernaut - 16단계 (Preservation) // SPDX-License-Identifier: MIT pragma solidity ^0.8.0; 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 _timeZone.. 2023. 11. 28. Ethernaut - 15단계 (Naught Coin) // SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import 'openzeppelin-contracts-08/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 = block.timestamp + 10 * 365 days; uint256 public INITIAL_SUPPLY; address public player; constructor(add.. 2023. 11. 23. Ethernaut - 14단계 (Gatekeeper Two) // SPDX-License-Identifier: MIT pragma solidity ^0.8.0; 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) == type(uint64).max);.. 2023. 11. 21. 이전 1 2 3 4 5 다음
