https://scoreboard.meepwn.team/task
Source code của "gate":
pragma solidity ^0.4.18;
contract Meepwn_Wire
{
address public entrant;
constructor()
{
entrant = msg.sender;
}
function isAccountAddress(address addr) private returns(bool)
{
uint x;
assembly { x := extcodesize(caller) }
return x == 0;
}
function exploitMe(bytes8 _key)
{
require(msg.sender != tx.origin);
require(isAccountAddress(msg.sender));
require(msg.gas % 1337 == 0);
require(uint64(_key) ^ uint64(sha3(msg.sender)) ^ uint64(sha3(address(this))) == 0x13371337);
entrant = tx.origin;
}
}
