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# From_Solidity_To_Substrate
Workshop repository for the workshop at BME, 2023 August.
Workshop repository for the workshop at BME, 2023 August.
Presentation slides and references TBA

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Solidity/CCTF.sol 100644
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// SPDX-License-Identifier: Apache-2.0
// Authors: Anonz team, developed at Polkadot Metaverse Championship, as part of their CCTF track solution.
// Based on Six's and Silur's CCTF 2022 code.
pragma solidity ^0.8.16;
contract CryptoCTFX {
enum PlayerStatus {
Unverified,
Verified,
Banned
}
struct Player {
PlayerStatus status;
uint score;
}
modifier onlyExistingContest(uint contestID) {
require(contests[contestID].admin != address(0), "Unknown contest ID");
_;
}
modifier onlyAdmin(uint contestID) {
require(msg.sender == contests[contestID].admin, "You are not the admin of this contest");
_;
}
modifier onlyOpen(uint contestID) {
require(contests[contestID].submissionsOpen, "Submissions are not open for this contest at this time");
_;
}
modifier onlyExistingChallenge(uint contestID, uint challengeID) {
require(contests[contestID].challenges[challengeID].obscuredFlag != address(0), "Unknown challenge ID");
_;
}
struct Challenge {
address obscuredFlag; // public key of the flag
uint worth;
uint256 descriptionFingerprint;
bool onlyFirstSolver;
string skill;
}
struct Contest {
address admin;
mapping (uint => Challenge) challenges;
mapping (address => Player) players;
bool submissionsOpen;
mapping (address => mapping (uint => bool)) solves; // address -> challengeID -> solved/not
mapping (uint => bool) anySolves; // challengeID -> solved/not
}
mapping (uint => Contest) public contests;
event ChallengeAddedOrUpdated(uint contestID, uint indexed challengeID);
event ChallengeSolved(uint contestID, uint indexed challengeID, address indexed solver);
function createContest(uint contestID) external {
require(contests[contestID].admin == address(0), "This contest ID has already been registered");
contests[contestID].admin = msg.sender;
contests[contestID].submissionsOpen = false;
}
function setAdmin(uint contestID, address newAdmin) external onlyExistingContest(contestID) onlyAdmin(contestID) {
require(newAdmin != address(0));
contests[contestID].admin = newAdmin;
}
function setSubmissionsStatus(uint contestID, bool open) external onlyExistingContest(contestID) onlyAdmin(contestID) {
contests[contestID].submissionsOpen = open;
}
function addOrUpdateChallenge(uint contestID, uint challengeID, address obscuredFlag, uint worth, uint256 descriptionFingerprint, bool onlyFirstSolver, string memory skill) external onlyExistingContest(contestID) onlyAdmin(contestID) {
require(obscuredFlag != address(0), "The obscured flag value must not be 0");
contests[contestID].challenges[challengeID] = Challenge(obscuredFlag, worth, descriptionFingerprint, onlyFirstSolver, skill);
emit ChallengeAddedOrUpdated(contestID, challengeID);
}
function register(uint contestID, string memory password) external onlyExistingContest(contestID) {
require(contests[contestID].players[msg.sender].status == PlayerStatus.Unverified, "You are already registered or banned in this contest");
require(keccak256(abi.encodePacked("I_read_it")) == keccak256(abi.encodePacked(password)));
contests[contestID].players[msg.sender].status = PlayerStatus.Verified;
}
function setPlayerStatus(uint contestID, address player, PlayerStatus status) external onlyExistingContest(contestID) onlyAdmin(contestID) {
contests[contestID].players[player].status = status;
}
function submitFlag(uint contestID, uint challengeID, bytes memory signature) external onlyExistingContest(contestID) onlyExistingChallenge(contestID, challengeID) onlyOpen(contestID) {
require(contests[contestID].players[msg.sender].status == PlayerStatus.Verified, "You are unverified or banned in this contest");
// the correct signature is an ECDSA signature where (1) the message (hash) is the sender address and (2) the private key is the flag;
// (2) is checked by testing against the public key, which can then be public information
address recoveredSigner = recoverSigner(bytes32(abi.encodePacked(msg.sender)), signature);
require(recoveredSigner != address(0), "Invalid signature");
require(recoveredSigner == contests[contestID].challenges[challengeID].obscuredFlag, "Wrong answer");
require(!contests[contestID].solves[msg.sender][challengeID], "You have already solved this challenge of this contest");
if (!contests[contestID].anySolves[challengeID] || !contests[contestID].challenges[challengeID].onlyFirstSolver) {
contests[contestID].players[msg.sender].score += contests[contestID].challenges[challengeID].worth;
}
contests[contestID].solves[msg.sender][challengeID] = true;
contests[contestID].anySolves[challengeID] = true;
emit ChallengeSolved(contestID, challengeID, msg.sender);
}
function recoverSigner(bytes32 messageHash, bytes memory signature) public pure returns (address) {
(bytes32 r, bytes32 s, uint8 v) = splitSignature(signature);
return ecrecover(messageHash, v, r, s);
}
function splitSignature(bytes memory sig) public pure returns (bytes32 r, bytes32 s, uint8 v) {
require(sig.length == 65, "Invalid signature length");
assembly {
r := mload(add(sig, 32))
s := mload(add(sig, 64))
v := byte(0, mload(add(sig, 96)))
}
}
function getPlayerStatus(uint contestID, address player) external view onlyExistingContest(contestID) returns (PlayerStatus) {
return contests[contestID].players[player].status;
}
function getPlayerScore(uint contestID, address player) external view onlyExistingContest(contestID) returns (uint) {
return contests[contestID].players[player].score;
}
}

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Solidity/Easy.sol 100644
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// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.8.2 <0.9.0;
/**
* @title Storage
* @dev Store & retrieve value in a variable
* @custom:dev-run-script ./scripts/deploy_with_ethers.ts
*/
contract Storage {
address private owner;
// event for EVM logging
event OwnerSet(address indexed oldOwner, address indexed newOwner);
// modifier to check if caller is owner
modifier isOwner() {
// If the first argument of 'require' evaluates to 'false', execution terminates and all
// changes to the state and to Ether balances are reverted.
// This used to consume all gas in old EVM versions, but not anymore.
// It is often a good idea to use 'require' to check if functions are called correctly.
// As a second argument, you can also provide an explanation about what went wrong.
require(msg.sender == owner, "Caller is not owner");
_;
}
/**
* @dev Set contract deployer as owner
*/
constructor() {
console.log("Owner contract deployed by:", msg.sender);
owner = msg.sender; // 'msg.sender' is sender of current call, contract deployer for a constructor
emit OwnerSet(address(0), owner);
}
/**
* @dev Change owner
* @param newOwner address of new owner
*/
function changeOwner(address newOwner) public isOwner {
emit OwnerSet(owner, newOwner);
owner = newOwner;
}
/**
* @dev Return owner address
* @return address of owner
*/
function getOwner() external view returns (address) {
return owner;
}
uint256 number;
/**
* @dev Store value in variable
* @param num value to store
*/
function store(uint256 num) public {
number = num;
}
/**
* @dev Return value
* @return value of 'number'
*/
function retrieve() public view returns (uint256){
return number;
}
}