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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,109 @@ | ||
| import { Request, Response } from "express"; | ||
| import { getSecretKeys } from "../utils/secret"; | ||
| import { base_encode } from "near-api-js/lib/utils/serialize"; | ||
| import { getVoterPublicKey, isNominee, getAllVotes, sendResultsToContract } from "../utils/near"; | ||
| import { decrypt, verifySignature } from "../../cryptography"; | ||
| import { VotingPackage } from "../../cryptography/types"; | ||
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| export const getPublicKey = async (_: Request, res: Response) => { | ||
| const secretKeys = await getSecretKeys(); | ||
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| if (secretKeys.error || !secretKeys.data) { | ||
| console.error("Error while getting secret keys", secretKeys.error); | ||
| return res.status(500).send({ message: "Error while getting secret keys" }); | ||
| } | ||
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| return res.status(200).send(base_encode(secretKeys.data.public)); | ||
| } | ||
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| export const postDecryption = async (req: Request, res: Response) => { | ||
| const secretKeys = await getSecretKeys(); | ||
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| if (secretKeys.error || !secretKeys.data) { | ||
| console.error("Error while getting secret keys", secretKeys.error); | ||
| return res.status(500).send({ message: "Error while getting secret keys" }); | ||
| } | ||
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| if (secretKeys.data.private === undefined) { | ||
| const endTime = new Date(secretKeys.data.end_time / 1_000_000).toUTCString() | ||
| return res.status(425).send({ message: `Secret key not available yet. Please come after ${endTime} UTC` }); | ||
| } | ||
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| const encryptedVotes = await getAllVotes(); | ||
| if (encryptedVotes.length === 0) { | ||
| return res.status(400).send({ message: "No votes to decrypt" }); | ||
| } | ||
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| const decryptedVotes = new Map<string, VotingPackage>(); | ||
| for (let i = 0; i < encryptedVotes.length; i++) { | ||
| const vote = encryptedVotes[i]; | ||
| let result = await decrypt(vote, secretKeys.data.private); | ||
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| if (result.error || !result.data) { | ||
| console.log(`Discard vote ${i}: ${result.error}`); | ||
| continue; | ||
| } | ||
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| let isValid = await validateVote(result.data, i); | ||
| if (!isValid) { | ||
| continue; | ||
| } | ||
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| if (decryptedVotes.has(result.data.accountId)) { | ||
| console.log(`Found new vote for ${result.data.accountId}. Replacing the old vote`); | ||
| } | ||
| decryptedVotes.set(result.data.accountId, result.data); | ||
| } | ||
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| const results = new Map<string, number>(); | ||
| decryptedVotes.forEach((vote) => { | ||
| vote.votes.forEach((v) => { | ||
| results.set(v.candidate, (results.get(v.candidate) ?? 0) + v.weight); | ||
| }); | ||
| }); | ||
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| if (await sendResultsToContract(Array.from(results.entries()))) { | ||
| return res.status(200).send(decryptedVotes); | ||
| } | ||
| return res.status(500).send({ message: "Error while submitting results to the contract" }); | ||
| } | ||
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| const validateVote = async (vote: VotingPackage, voteNumber: number): Promise<boolean> => { | ||
| const { accountId, votes, signature } = vote; | ||
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| const voterInfo = await getVoterPublicKey(accountId); | ||
| if (!voterInfo) { | ||
| console.log(`Discard vote ${voteNumber}: Voter is not registered`); | ||
| return false; | ||
| } | ||
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| const data = base_encode(JSON.stringify({ accountId, votes })); | ||
| if (!verifySignature(data, voterInfo.public_key, signature)) { | ||
| console.log(`Discard vote ${voteNumber}: Invalid user signature`); | ||
| return false; | ||
| } | ||
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| let totalWeightUsed = 0; | ||
| for (let i = 0; i < votes.length; i++) { | ||
| let vote = votes[i]; | ||
| if (vote.weight < 0) { | ||
| console.log(`Discard vote ${voteNumber}: Invalid vote weight`); | ||
| return false; | ||
| } | ||
| totalWeightUsed += vote.weight; | ||
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| let status = await isNominee(vote.candidate); | ||
| if (!status) { | ||
| console.log(`Discard vote ${voteNumber}: Invalid candidate`); | ||
| return false; | ||
| } | ||
| } | ||
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| if (totalWeightUsed > voterInfo.vote_weight) { | ||
| console.log(`Discard vote ${voteNumber}: Vote weight exceeds the voter's total weight`); | ||
| return false; | ||
| } | ||
|
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| return true; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,8 +1,12 @@ | ||
| import express from "express"; | ||
| import { postVote } from "./controllers/submitVote"; | ||
| import { getPublicKey, postDecryption } from "./controllers/decryption"; | ||
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| const routes = express.Router(); | ||
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| routes.get("/encryption-public-key", getPublicKey); | ||
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| routes.post("/vote", postVote) | ||
| routes.post("/decrypt", postDecryption); | ||
|
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| export { routes }; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,74 @@ | ||
| import { SecretNetworkClient, Wallet } from "secretjs"; | ||
| import ecdsa from "secp256k1"; | ||
| import { NETWORK_ID, SECRET_CODE_HASH, SECRET_CONTRACT } from "../.."; | ||
| import { Result } from "../../cryptography"; | ||
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| const wallet = new Wallet(); | ||
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| let secretjs: SecretNetworkClient; | ||
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| if (NETWORK_ID === "mainnet") { | ||
| secretjs = new SecretNetworkClient({ | ||
| chainId: "secret-4", | ||
| url: "https://rpc.ankr.com/http/scrt_cosmos", | ||
| wallet: wallet, | ||
| walletAddress: wallet.address, | ||
| }); | ||
| } | ||
| else { | ||
| secretjs = new SecretNetworkClient({ | ||
| chainId: "pulsar-3", | ||
| url: "https://lcd.pulsar-3.secretsaturn.net", | ||
| wallet: wallet, | ||
| walletAddress: wallet.address, | ||
| }); | ||
| } | ||
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| type SecretResponse = { | ||
| public: number[], | ||
| private: number[] | undefined, | ||
| end_time: number | ||
| } | ||
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| type Response = { | ||
| public: Uint8Array, | ||
| private: Uint8Array | undefined, | ||
| end_time: number | ||
| } | ||
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| type Request = { | ||
| get_keys: {} | ||
| } | ||
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| export async function getSecretKeys(): Promise<Result<Response>> { | ||
| let query = await secretjs.query.compute.queryContract<Request, SecretResponse>({ | ||
| contract_address: SECRET_CONTRACT!, | ||
| query: { | ||
| get_keys: {}, | ||
| }, | ||
| code_hash: SECRET_CODE_HASH, | ||
| }); | ||
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| if (query.private !== undefined && query.private.length > 0) { | ||
| const derivedPubKey = ecdsa.publicKeyCreate(Uint8Array.from(query.private), true); | ||
| const publicKey = query.public; | ||
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| if (!derivedPubKey.every((value, index) => value === publicKey[index])) { | ||
| return { | ||
| error: 'Secret key is invalid', | ||
| data: undefined | ||
| } | ||
| } | ||
| } | ||
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| return { | ||
| error: undefined, | ||
| data: { | ||
| public: Uint8Array.from(query.public), | ||
| private: query.private ? Uint8Array.from(query.private) : undefined, | ||
| end_time: query.end_time | ||
| } | ||
| } | ||
| }; | ||
|
|
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