arnaucube
/
websnark
mirror of https://github.com/arnaucube/websnark.git

<html>
<header>
</header>
<script src="websnark.js"></script>
<script>

var witness;
var provingKey;

function onLoad() {

    fetch("proving_key.bin").then( (response) => {
        return response.arrayBuffer();
    }).then( (b) => {
        provingKey = b;
    });

    fetch("witness.bin").then( (response) => {
        return response.arrayBuffer();
    }).then( (b) => {
        witness = b;
    });
}

function calcProof() {
    const start = new Date().getTime();
    document.getElementById("time").innerHTML = "processing....";
    document.getElementById("proof").innerHTML = "";

    window.genZKSnarkProof(witness, provingKey).then((p)=> {
        const end = new Date().getTime();
        const time = end - start;
        document.getElementById("time").innerHTML = `Time to compute: ${time}ms`;
        document.getElementById("proof").innerHTML = JSON.stringify(p, null, 1);
    });
}

function test() {

    const groth16 = window.groth16;
    const nSignals = 1;

    const pkey32 = new Uint32Array(provingKey);
    const pPointsA = pkey32[5];

    const points = provingKey.slice(pPointsA, pPointsA + nSignals*64);
    const signals = witness.slice(0, nSignals*32);

    const pr1 = groth16.alloc(96);
    const pPoints = groth16.alloc(points.byteLength);
    groth16.putBin(pPoints, points);

    const pSignals = groth16.alloc(signals.byteLength);
    groth16.putBin(pSignals, signals);

    groth16.instance.exports.g1_zero(pr1);
    groth16.instance.exports.g1_multiexp(pSignals, pPoints, nSignals, 1, pr1);
    groth16.instance.exports.g1_affine(pr1, pr1);
    groth16.instance.exports.g1_fromMontgomery(pr1, pr1);

    const r1 = groth16.bin2g1(groth16.getBin(pr1, 96));

    groth16.instance.exports.g1_zero(pr1);
    groth16.instance.exports.g1_multiexp2(pSignals, pPoints, nSignals, 1, pr1);
    groth16.instance.exports.g1_affine(pr1, pr1);
    groth16.instance.exports.g1_fromMontgomery(pr1, pr1);

    const r2 = groth16.bin2g1(groth16.getBin(pr1, 96));

    console.log(r1);
    console.log(r2);
}

</script>
<body onLoad="onLoad()">
<h1>iden3</h1>
<h2>Zero knowledge proof generator</h2>
<button onClick="calcProof()">Test</button>
<div id="time"></div>
<pre id="proof"></pre>

</body>
</html>