Add generate randomness

contribution/contribution.js

@@ -1,4 +1,22 @@
 const bls = require('@noble/curves/bls12-381');
+const crypto = require('crypto');
+const os = require('os');
+const Fr = bls.bls12_381.CURVE.Fr;
+
+function generateRandom(){
+    const [seconds, nanoseconds] = process.hrtime();
+    const seed = os.hostname() + os.freemem() + seconds + nanoseconds;
+
+    const hash = crypto.createHash('sha256')
+        .update(seed)
+        .digest();
+    const seedInt = hash.readInt32LE();
+
+    randomBytes = crypto.randomBytes(32);
+    const randomInt = (parseInt(randomBytes.toString('hex'), 16) + seedInt);
+    const randomBigInt = BigInt(randomInt);
+    return randomBigInt;
+}
 
 // TODO: Confirm by initialContribution.json
 // TODO: Support multi-thread?
@@ -10,15 +28,13 @@ function contribute(contributions, rand) {
 
     const G1 = bls.bls12_381.CURVE.G1;
     const G2 = bls.bls12_381.CURVE.G2;
-    const Fr = bls.bls12_381.CURVE.Fr;
 
     const util = bls.bls12_381.utils;
 
     for(var i = 0; i < contributions.length; i++) {
         const g1Powers = contributions[i].powersOfTau.G1Powers;
         const g2Powers = contributions[i].powersOfTau.G2Powers;
-
-        var xi = 1n;
+        var xi = BigInt(1);
         for(var j = 0; j < contributions[i].numG1Powers; j++) {
             const g1Affine = g1Powers[j];
             const g1PrjPoint = G1Point.fromAffine(g1Affine);
@@ -37,7 +53,6 @@ function contribute(contributions, rand) {
 
                 contributions[i].powersOfTau.G2Powers[j] = g2NewAffine;
             }
-
             xi = (xi * rand) % Fr.ORDER;
         }
     };
@@ -76,4 +91,5 @@ function updateWitness(contributions, rand) {
 module.exports = {
     contribute: contribute,
     updateWitness: updateWitness,
+    generateRandom: generateRandom,
 };

index.js

@@ -5,7 +5,8 @@ const fs = require('fs');
 const contribute = require('./contribution/contribution.js');
 const conversion = require('./contribution/coversion.js');
 const seq = require('./sequencerclient/sequencerClient.js');
-
+const bls = require('@noble/curves/bls12-381');
+const Fr = bls.bls12_381.CURVE.Fr;
 
 // const url = 'https://seq.ceremony.ethereum.org';
 // const url = 'https://kzg-ceremony-sequencer-dev.fly.dev';
@@ -70,20 +71,23 @@ program
                 console.log(`Error ${resp.status}`);
                 return;
             }
-
             break;
         }
 
         console.log('Decoding...');
         contributions = conversion.decode(resp.contributions);
+        //contributions = conversion.decode('{"contributions": [ '+resp.contributions+'}');
 
-        const randValue = Math.floor(Math.random() * 100000); // TODO:
+        rand = contribute.generateRandom();
+        rand = Fr.create(rand);
 
         console.log('Update Power of Tau...');
-        var newContributions = contribute.contribute(contributions, BigInt(randValue));
+        var newContributions = contribute.contribute(contributions, rand);
 
         console.log('Update Witnesses...');
-        newContributions = contribute.updateWitness(newContributions, BigInt(randValue));
+        newContributions = contribute.updateWitness(newContributions, rand);
+
+        rand = null;
 
         console.log('Encoding...');
         newContributions = conversion.encode(newContributions);

test/bls.test.js

@@ -1,7 +1,9 @@
 const fs = require('fs');
 const assert = require("assert");
 const bls = require('@noble/curves/bls12-381');
+const contribute = require('../contribution/contribution.js');
 
+const Fr = bls.bls12_381.CURVE.Fr;
 const util = bls.bls12_381.utils;
 const G1 = bls.bls12_381.CURVE.G1;
 const G2 = bls.bls12_381.CURVE.G2;
@@ -156,3 +158,12 @@ describe('power-of_tau', function() {
 // def update_witness(contribution: Contribution, x: int) -> Contribution:
 //     contribution.pot_pubkey = bls.G2.mul(x, bls.G2.g2)
 //     return contribution
+
+describe('Random', function() {
+    it('Generate Random', function(){
+        var random = contribute.generateRandom();
+        console.log("rand: "+random);
+        random  = Fr.create(random);
+        console.log("Fr.create(rand): "+random);
+    });
+});