基于模糊提取器的去中心化身份生物特征密钥派生

class SyndromeSketch:
    def __init__(self, n, k, t):
        self.n, self.k, self.t = n, k, t
        self.syn_matrix = generate_bch_syndrome_matrix(n, k)
 
    def sketch(self, w):
        return np.dot(self.syn_matrix, w) % 2
 
    def recover(self, w_prime, s):
        s_prime = np.dot(self.syn_matrix, w_prime) % 2
        error_syn = (s_prime - s) % 2
        e = bch_decode(error_syn, self.t)
        return (w_prime - e) % 2

pub fn fuzzy_gen(biometric: &[u8]) -> (Vec<u8>, Vec<u8>) {
    let sketch = secure_sketch(biometric);
    let seed: Vec<u8> = (0..32).map(|_| rng.gen()).collect();
    let key = extract_key(biometric, &seed);
    let helper = [sketch, seed].concat();
    (key, helper)
}
 
pub fn fuzzy_rep(noisy_biometric: &[u8], helper: &[u8]) -> Vec<u8> {
    let (sketch, seed) = split_helper(helper);
    let recovered = sketch_recover(noisy_biometric, sketch);
    extract_key(&recovered, &seed)
}

async function biometricToWallet(rawBiometric) {
    const binary = await preprocessBiometric(rawBiometric);
    const { key, helper } = await fuzzyExtractor.gen(binary);
 
    const expandedKey = await hkdf(
        key,
        128,
        'bip39-seed',
        await crypto.getRandomValues(new Uint8Array(32))
    );
 
    const mnemonic = bip39.entropyToMnemonic(expandedKey);
    const seed = await bip39.mnemonicToSeed(mnemonic);
    const master = bip32.fromSeed(seed);
 
    return {
        btc: deriveBitcoin(master),
        eth: deriveEthereum(master),
        sol: deriveSolana(seed),
        helper,
        salt
    };
}

import { derivePath } from 'ed25519-hd-key';
 
const solSeed = derivePath("m/44'/501'/0'/0'", seed.toString('hex')).key;
const solKeypair = Keypair.fromSeed(solSeed);
const solAddress = solKeypair.publicKey.toBase58();

async function requestCredential(wallet, issuerEndpoint, claimData) {
    const connectionRequest = await issuerEndpoint.createConnection(wallet.did);
    
    const credentialOffer = await issuerEndpoint.offerCredential({
        type: 'KYCCredential',
        schema: 'https://schema.org/kyc-v1',
        claims: {
            country: claimData.country,
            birthYear: claimData.birthYear,
            verified: true
        }
    });
    
    const signedVC = await wallet.acceptCredential(credentialOffer);
    await wallet.storeCredential(signedVC);
    
    return signedVC;
}

{
  "@context": "https://www.w3.org/2018/credentials/v1",
  "type": ["VerifiableCredential", "KYCCredential"],
  "issuer": "did:polygonid:polygon:amoy:2qH7...",
  "issuanceDate": "2025-01-15T00:00:00Z",
  "credentialSubject": {
    "id": "did:polygonid:polygon:amoy:2qPz...",
    "birthYear": 1995,
    "country": "US",
    "kycVerified": true
  },
  "proof": {
    "type": "BJJSignature2021",
    "issuerData": {...},
    "signature": "0x..."
  }
}

async function proveAge(wallet, minAge) {
    const credential = await wallet.getCredential('kyc');
    const inputs = {
        birthYear: credential.birthYear,
        currentYear: 2025,
        minAge: minAge,
        signature: credential.signature
    };
 
    const { proof, publicSignals } = await snarkjs.groth16.fullProve(
        inputs,
        "ageCheck.wasm",
        "ageCheck.zkey"
    );
 
    return { proof, publicSignals };
}

template AgeCheck() {
    signal input birthYear;
    signal input currentYear;
    signal input minAge;

    signal age <== currentYear - birthYear;

    component check = GreaterEqThan(16);
    check.in[0] <== age;
    check.in[1] <== minAge;
    
    signal output isValid;
    isValid <== check.out;
}

contract IdentityGate {
    mapping(address => mapping(uint256 => bool)) public verified;
 
    function submitProof(
        uint256 requestId,
        uint[2] calldata pA,
        uint[2][2] calldata pB,
        uint[2] calldata pC,
        uint[3] calldata pubSignals
    ) external {
        require(zkpVerifier.verifyProof(pA, pB, pC, pubSignals), "Invalid proof");
        require(pubSignals[2] >= minAge, "Age requirement not met");
 
        verified[msg.sender][requestId] = true;
        _grantAccess(msg.sender);
    }
}

class TradingAgent {
    constructor(agentFingerprint) {
        this.wallet = await biometricToWallet(agentFingerprint);
        this.did = await createDID(this.wallet);
    }
 
    async trade(dex, params) {
        const proof = await this.proveReputation();
        return await dex.trade(params, proof);
    }
}

contract DeFiProtocol {
    modifier onlyKYCVerified() {
        require(identityGate.verified(msg.sender, KYC_ID), "KYC required");
        _;
    }
 
    function borrowUndercollateralized(uint256 amount) external onlyKYCVerified {
        _issueLoan(msg.sender, amount);
    }
}

async function login(website) {
    const { key } = await fuzzyExtractor.rep(biometric, helper);
    const siteKey = deriveKey(key, website.domain);
    const signature = sign(challenge, siteKey);
    await website.verify(signature);
}

async function pay(merchant, amount) {
    const wallet = await biometricToWallet(scan);
 
    if (amount > 1000) {
        await merchant.verifyProof(generateKYCProof(wallet));
    }
 
    await wallet.sendTransaction({ to: merchant.address, value: amount });
}

contract AML {
    bytes32 public scamMerkleRoot;
 
    function checkClean(address wallet, bytes32[] calldata proof) public view returns (bool) {
        bytes32 hash = keccak256(abi.encodePacked(wallet));
        return !MerkleProof.verify(proof, scamMerkleRoot, hash);
    }
}

docker-compose up -d
make import-private-key-to-kms private_key=<eth-key>
 
# access the ui at localhost:8088
# access the api at localhost:3001

const issuerAPI = new IssuerNode({
    url: 'https://issuer.example.com',
    auth: { user: 'admin', password: 'secure' }
});
 
await issuerAPI.createIdentity({
    blockchain: 'polygon',
    network: 'amoy',
    method: 'polygonid'
});
 
await issuerAPI.issueCredential({
    did: 'did:polygonid:...',
    schema: 'KYCCredential',
    claims: { ageOver: 18 }
});

async function migrate(oldBio, newBio) {
    const oldWallet = await recover(oldBio);
    const { newWallet, newHelper } = await enroll(newBio);
    await oldWallet.transferAll(newWallet.address);
    await storage.update(newHelper);
}

const checks = await Promise.all([
    depthSensor.measure(),
    motionDetector.verify(['blink', 'nod']),
    thermalCamera.capture(),
    videoAnalyzer.checkTemporal()
]);

async function enrollUser() {
    const bio = await captureLive();
    const { key, helper } = await fuzzyExtractor.gen(bio);
 
    const salt = await crypto.getRandomValues(new Uint8Array(32));
    const expandedKey = await hkdf('sha256', key, salt, 'bip39-seed', 128/8);
    const wallet = await deriveWallet(expandedKey);
 
    const did = await createDID(wallet.eth);
    const kycCred = await requestKYC(did, { passport, selfie });
 
    await storage.save({ helper, salt, did, credentials: [kycCred] });
    return { wallet, did };
}
 
async function accessDApp(dappURL) {
    const bio = await captureLive();
    const { helper, salt } = await storage.getHelperData();
    const key = await fuzzyExtractor.rep(bio, helper);
 
    const expandedKey = await hkdf('sha256', key, salt, 'bip39-seed', 128/8);
    const wallet = await deriveWallet(expandedKey);
 
    const proof = await generateProof(wallet, dappURL.request);
    await submitProof(wallet, proof, dappURL.verifier);
 
    await dappURL.grantAccess(wallet.address);
}
 
async function sendPayment(recipient, amount) {
    const bio = await captureLive();
    const { helper, salt } = await storage.getHelperData();
    const key = await fuzzyExtractor.rep(bio, helper);
 
    const expandedKey = await hkdf('sha256', key, salt, 'bip39-seed', 128/8);
    const wallet = await deriveWallet(expandedKey);
 
    await wallet.send({ to: recipient, value: amount });
}