Commit-Reveal Voting Smart Contract

This is a secure implementation of a voting system using the commit-reveal scheme in Solidity. The system ensures vote privacy during the voting period and prevents vote manipulation.

Architecture

The system is split into several contracts, each with a specific responsibility:

1. CommitRevealVoting.sol: Main contract that orchestrates the voting process
2. VotingPhases.sol: Library handling the different phases of voting
3. VoterRegistry.sol: Manages voter registration
4. CommitRevealLogic.sol: Handles the commit-reveal voting logic

How It Works

The voting process has three phases:

1. Commit Phase:

   • Voters submit a hash (commitment) of their vote and a secret
   • The actual vote remains hidden during this phase

2. Reveal Phase:

   • Voters reveal their vote and secret
   • The contract verifies that the hash matches the original commitment

3. Results Phase:

   • After the reveal phase ends, anyone can query the results

Usage

For Voters

1. Register as a voter:

await voting.registerVoter(voterAddress);

2. Create a commitment:

const secret = ethers.utils.randomBytes(32);
const commitment = ethers.utils.keccak256(
    ethers.utils.defaultAbiCoder.encode(
        ["bool", "bytes32"],
        [voteChoice, secret]
    )
);

3. Submit your commitment during the commit phase:

await voting.commitVote(commitment);

4. Reveal your vote during the reveal phase:

await voting.revealVote(voteChoice, secret);

For Admin

1. Deploy the contract:

const voting = await CommitRevealVoting.deploy(commitDuration, revealDuration);

2. Start the voting:

await voting.startVoting();

3. Get results after voting ends:

const [yesVotes, noVotes] = await voting.getResults();

Security Features

• Vote privacy during commit phase
• Prevention of vote manipulation
• Immutable vote commitments
• Verifiable vote reveals
• Phase-based access control

Testing

Run the tests using:

npx hardhat test