websnark/example/index.html

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<html>
<header>
</header>
<script src="websnark.js"></script>
<script>
var witness;
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var provingKey;
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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);
});
}
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function test(funcName, a, b, r, n) {
const start = new Date().getTime();
window.groth16.instance.exports[funcName](a,b,r, n);
const end = new Date().getTime();
const time = end - start;
console.log("Time (ms): " + time);
}
function test2() {
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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);
}
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</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>