Contribution phase2
This commit is contained in:
Jordi Baylina
parent
2e9ce5efe6
commit
3ba1341404
13
cli.js
13
cli.js
@ -133,7 +133,7 @@ const commands = [
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cmd: "powersoftau import <powersoftau_old.ptau> <response> <<powersoftau_new.ptau>",
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description: "import a response to a ptau file",
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alias: ["pti"],
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options: "-verbose|v -nopoints -nocheck -description|d -name|n",
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options: "-verbose|v -nopoints -nocheck -name|n",
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action: powersOfTawImport
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},
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{
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@ -204,7 +204,7 @@ const commands = [
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cmd: "zkey contribute <circuit_old.zkey> <circuit_new.zkey>",
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description: "creates a zkey file with a new contribution",
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alias: ["zkc"],
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options: "-verbose|v",
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options: "-verbose|v -entropy|e -name|n",
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action: zkeyContribute
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},
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{
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@ -772,7 +772,7 @@ async function zkeyNew(params, options) {
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zkeyName = params[2];
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}
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return phase2.new(r1csName, ptauName, zkeyName, options.verbose);
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return zkey.new(r1csName, ptauName, zkeyName, options.verbose);
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}
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// zkey export bellman [circuit.zkey] [circuit.mpcparams]
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@ -792,7 +792,7 @@ async function zkeyExportBellman(params, options) {
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mpcparamsName = params[1];
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}
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return phase2.exportMPCParams(zkeyName, mpcparamsName, options.verbose);
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return zkey.exportMPCParams(zkeyName, mpcparamsName, options.verbose);
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}
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@ -846,8 +846,7 @@ async function zkeyVerify(params, options) {
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}
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// phase2 contribute <circuit_old.zkey> <circuit_new.zkey>
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// zkey contribute <circuit_old.zkey> <circuit_new.zkey>
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async function zkeyContribute(params, options) {
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let zkeyOldName;
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let zkeyNewName;
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@ -856,5 +855,5 @@ async function zkeyContribute(params, options) {
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zkeyNewName = params[1];
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return phase2.contribute(zkeyOldName, zkeyNewName, options.verbose);
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return zkey.contribute(zkeyOldName, zkeyNewName, options.name, options.entropy, options.verbose);
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}
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@ -7,7 +7,7 @@ const blake2b = require("blake2b");
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const ChaCha = require("ffjavascript").ChaCha;
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function hashToG2(hash) {
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const hashV = new DataView(hash.buffer);
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const hashV = new DataView(hash.buffer, hash.byteOffset, hash.byteLength);
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const seed = [];
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for (let i=0; i<8; i++) {
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seed[i] = hashV.getUint32(i*4);
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@ -57,6 +57,17 @@ function createPTauKey(curve, challangeHash, rng) {
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return key;
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}
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function createDeltaKey(curve, transcript, rng) {
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const delta = {};
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delta.prvKey = curve.Fr.fromRng(rng);
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delta.g1_s = curve.G1.affine(curve.G1.fromRng(rng));
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delta.g1_sx = curve.G1.affine(curve.G1.mulScalar(delta.g1_s, delta.prvKey));
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delta.g2_sp = hashToG2(transcript);
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delta.g2_spx = curve.G2.affine(curve.G2.mulScalar(delta.g2_sp, delta.prvKey));
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return delta;
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}
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module.exports.createPTauKey = createPTauKey;
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module.exports.getG2sp = getG2sp;
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module.exports.hashToG2 = hashToG2;
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module.exports.createDeltaKey =createDeltaKey;
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36
src/misc.js
36
src/misc.js
@ -1,4 +1,7 @@
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const Blake2b = require("blake2b-wasm");
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const readline = require("readline");
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const ChaCha = require("ffjavascript").ChaCha;
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const crypto = require("crypto");
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const _revTable = [];
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for (let i=0; i<256; i++) {
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@ -74,9 +77,42 @@ async function sameRatio(curve, g1s, g1sx, g2s, g2sx) {
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return res;
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}
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const rl = readline.createInterface({
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input: process.stdin,
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output: process.stdout
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});
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function askEntropy() {
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return new Promise((resolve) => {
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rl.question("Enter a random text. (Entropy): ", (input) => resolve(input) );
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});
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}
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async function getRandomRng(entropy) {
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// Generate a random key
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while (!entropy) {
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entropy = await askEntropy();
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}
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const hasher = Blake2b(64);
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hasher.update(crypto.randomBytes(64));
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const enc = new TextEncoder(); // always utf-8
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hasher.update(enc.encode(entropy));
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const hash = Buffer.from(hasher.digest());
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const seed = [];
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for (let i=0;i<8;i++) {
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seed[i] = hash.readUInt32BE(i*4);
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}
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const rng = new ChaCha(seed);
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return rng;
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}
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module.exports.bitReverse = bitReverse;
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module.exports.log2 = log2;
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module.exports.formatHash = formatHash;
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module.exports.hashIsEqual = hashIsEqual;
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module.exports.cloneHasher = cloneHasher;
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module.exports.sameRatio = sameRatio;
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module.exports.getRandomRng = getRandomRng;
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@ -1,5 +1,6 @@
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const buildTaskManager = require("./taskmanager");
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const binFileUtils = require("./binfileutils");
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/*
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This function creates a new section in the fdTo file with id idSection.
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@ -8,116 +9,36 @@ const buildTaskManager = require("./taskmanager");
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It also updates the newChallangeHasher with the new points
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*/
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async function applyKey(params) {
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const {
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fdFrom,
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sections,
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curve,
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fdTo,
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sectionId,
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NPoints,
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G:Gs,
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first,
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inc,
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newChallangeHasher,
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responseHasher,
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returnPoints,
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sectionName,
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verbose
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} = params;
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const G = curve[Gs];
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const MAX_CHUNK_SIZE = 1024;
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let res = [];
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async function applyKeyToSection(fdOld, sections, fdNew, idSection, curve, groupName, first, inc, sectionName, verbose) {
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const MAX_CHUNK_SIZE = 1 << 16;
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const G = curve[groupName];
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const sG = G.F.n8*2;
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const buffUv = new Uint8Array(sG);
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const scG = G.F.n8;
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const buffCv = new Uint8Array(scG);
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const nPoints = sections[idSection][0].size / sG;
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const taskManager = await buildTaskManager(contributeThread, {
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ffjavascript: "ffjavascript"
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},{
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curve: curve.name
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});
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await binFileUtils.startReadUniqueSection(fdOld, sections,idSection );
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await binFileUtils.startWriteSection(fdNew, idSection);
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fdFrom.pos = sections[sectionId][0].p;
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await fdTo.writeULE32(sectionId); // tauG1
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const pSection = fdTo.pos;
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await fdTo.writeULE64(0); // Temporally set to 0 length
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let t = first;
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let writePointer = fdTo.pos;
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let beginWritePointer = fdTo.pos;
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for (let i=0; i< NPoints; i+=MAX_CHUNK_SIZE) {
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if ((verbose)&&i) console.log(`${sectionName}: ` + i);
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const n = Math.min(NPoints - i, MAX_CHUNK_SIZE);
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const buff = await fdFrom.read(n*sG);
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await taskManager.addTask({
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cmd: "MUL",
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G: Gs,
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first: t,
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inc: inc.toString(),
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buff: buff.slice(),
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n: n,
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writePos: writePointer
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}, async function(r) {
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return await fdTo.write(r.buff, r.writePos);
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});
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for (let i=0; i<nPoints; i += MAX_CHUNK_SIZE) {
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if (verbose) console.log(`Applying key: ${sectionName}: ${i}/${nPoints}`);
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const n= Math.min(nPoints - i, MAX_CHUNK_SIZE);
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let buff;
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buff = await fdOld.read(n*sG);
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buff = await G.batchApplyKey(buff, t, inc);
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await fdNew.write(buff);
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t = curve.Fr.mul(t, curve.Fr.pow(inc, n));
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writePointer += n*sG;
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}
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await taskManager.finish();
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await binFileUtils.endWriteSection(fdNew);
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await binFileUtils.endReadSection(fdOld);
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const sSize = fdTo.pos - pSection -8;
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const lastPos = fdTo.pos;
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await fdTo.writeULE64(sSize, pSection);
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fdTo.pos = lastPos;
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fdTo.pos = beginWritePointer;
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for (let i=0; i<NPoints; i++) {
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const buff = await fdTo.read(sG);
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const P = G.fromRprLEM(buff, 0);
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G.toRprBE(buffUv, 0, P);
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newChallangeHasher.update(buffUv);
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G.toRprCompressed(buffCv, 0, P);
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responseHasher.update(buffCv);
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const idx = returnPoints.indexOf(i);
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if (idx>=0) res[idx] = P;
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}
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}
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async function applyKeyToBinFile(fdOld, fdNew, curve, groupName, nPoints, first, inc, sectionName, verbose) {
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return res;
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}
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function contributeThread(ctx, task) {
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if (task.cmd == "INIT") {
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ctx.assert = ctx.modules.assert;
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if (task.curve == "bn128") {
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ctx.curve = ctx.modules.ffjavascript.bn128;
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} else {
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ctx.assert(false, "curve not defined");
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}
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return {};
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} else if (task.cmd == "MUL") {
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const G = ctx.curve[task.G];
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const sG = G.F.n64*8*2;
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const buffDest = new Uint8Array(sG*task.n);
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let t = ctx.curve.Fr.e(task.first);
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let inc = ctx.curve.Fr.e(task.inc);
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for (let i=0; i<task.n; i++) {
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const P = G.fromRprLEM(task.buff, i*sG);
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const R = G.mulScalar(P, t);
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G.toRprLEM(buffDest, i*sG, R); // Main thread will convert it to Montgomery
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t = ctx.curve.Fr.mul(t, inc);
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}
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return {
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buff: buffDest,
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writePos: task.writePos
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};
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} else {
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ctx.assert(false, "Op not implemented");
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}
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}
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module.exports = applyKey;
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module.exports.applyKeyToBinFile = applyKeyToBinFile;
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module.exports.applyKeyToSection = applyKeyToSection;
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@ -1,4 +1,87 @@
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module.exports = async function phase2contribute(zkeyNameOld, zkeyNameNew, verbose) {
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const binFileUtils = require("./binfileutils");
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const zkeyUtils = require("./zkey_utils");
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const getCurve = require("./curves").getCurveFromQ;
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const misc = require("./misc");
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const Blake2b = require("blake2b-wasm");
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const utils = require("./zkey_utils");
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const hashToG2 = require("./keypair").hashToG2;
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const {applyKeyToSection} = require("./mpc_applykey");
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module.exports = async function phase2contribute(zkeyNameOld, zkeyNameNew, name, entropy, verbose) {
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await Blake2b.ready();
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const {fd: fdOld, sections: sections} = await binFileUtils.readBinFile(zkeyNameOld, "zkey", 2);
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const zkey = await zkeyUtils.readHeader(fdOld, sections, "groth16");
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const curve = getCurve(zkey.q);
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await curve.loadEngine();
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const mpcParams = await zkeyUtils.readMPCParams(fdOld, curve, sections);
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const fdNew = await binFileUtils.createBinFile(zkeyNameNew, "zkey", 1, 10);
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const curContribution = {};
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const rng = await misc.getRandomRng(entropy);
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const transcriptHasher = Blake2b(64);
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for (let i=0; i<mpcParams.contributions.length; i++) {
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utils.hashPubKey(transcriptHasher, curve, mpcParams.contributions[i]);
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}
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curContribution.delta = {};
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curContribution.delta.prvKey = curve.Fr.fromRng(rng);
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curContribution.delta.g1_s = curve.G1.affine(curve.G1.fromRng(rng));
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curContribution.delta.g1_sx = curve.G1.affine(curve.G1.mulScalar(curContribution.delta.g1_s, curContribution.delta.prvKey));
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utils.hashG1(transcriptHasher, curve, curContribution.delta.g1_s);
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utils.hashG1(transcriptHasher, curve, curContribution.delta.g1_sx);
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curContribution.transcript = transcriptHasher.digest();
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curContribution.delta.g2_sp = hashToG2(curContribution.transcript);
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curContribution.delta.g2_spx = curve.G2.affine(curve.G2.mulScalar(curContribution.delta.g2_sp, curContribution.delta.prvKey));
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zkey.vk_delta_1 = curve.G1.mulScalar(zkey.vk_delta_1, curContribution.delta.prvKey);
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zkey.vk_delta_2 = curve.G2.mulScalar(zkey.vk_delta_2, curContribution.delta.prvKey);
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curContribution.deltaAfter = zkey.vk_delta_1;
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mpcParams.contributions.push(curContribution);
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curContribution.type = 0;
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if (name) curContribution.name = name;
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await zkeyUtils.writeHeader(fdNew, zkey);
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// IC
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await binFileUtils.copySection(fdOld, sections, fdNew, 3);
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// Coeffs (Keep original)
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await binFileUtils.copySection(fdOld, sections, fdNew, 4);
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// A Section
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await binFileUtils.copySection(fdOld, sections, fdNew, 5);
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// B1 Section
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await binFileUtils.copySection(fdOld, sections, fdNew, 6);
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// B2 Section
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await binFileUtils.copySection(fdOld, sections, fdNew, 7);
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const invDelta = curve.Fr.inv(curContribution.delta.prvKey);
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await applyKeyToSection(fdOld, sections, fdNew, 8, curve, "G1", invDelta, curve.Fr.e(1), "L Section", verbose);
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await applyKeyToSection(fdOld, sections, fdNew, 9, curve, "G1", invDelta, curve.Fr.e(1), "H Section", verbose);
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await zkeyUtils.writeMPCParams(fdNew, curve, mpcParams);
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await fdOld.close();
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await fdNew.close();
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const contributionHasher = Blake2b(64);
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utils.hashPubKey(contributionHasher, curve, curContribution);
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const contribuionHash = contributionHasher.digest();
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console.log("Contribution Hash: ");
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console.log(misc.formatHash(contribuionHash));
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return true;
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};
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@ -395,7 +395,7 @@ module.exports = async function phase2new(r1csName, ptauName, zkeyName, verbose
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async function hashHPoints() {
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const CHUNK_SIZE = 1<<20;
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const CHUNK_SIZE = 1<<16;
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hashU32(domainSize-1);
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@ -346,6 +346,33 @@ async function readContribution(fd, curve) {
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c.delta.g1_sx = await readG1(fd, curve);
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c.delta.g2_spx = await readG2(fd, curve);
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c.transcript = await fd.read(64);
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c.type = await fd.readULE32();
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const paramLength = await fd.readULE32();
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const curPos = fd.pos;
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let lastType =0;
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while (fd.pos-curPos < paramLength) {
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const buffType = await fd.read(1);
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if (buffType[0]<= lastType) throw new Error("Parameters in the contribution must be sorted");
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lastType = buffType[0];
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if (buffType[0]==1) { // Name
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const buffLen = await fd.read(1);
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const buffStr = await fd.read(buffLen[0]);
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c.name = new TextDecoder().decode(buffStr);
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} else if (buffType[0]==2) {
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const buffExp = await fd.read(1);
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c.numIterationsExp = buffExp[0];
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} else if (buffType[0]==3) {
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const buffLen = await fd.read(1);
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c.beaconHash = await fd.read(buffLen[0]);
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} else {
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throw new Error("Parameter not recognized");
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}
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}
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if (fd.pos != curPos + paramLength) {
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throw new Error("Parametes do not match");
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}
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return c;
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}
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@ -370,6 +397,31 @@ async function writeContribution(fd, curve, c) {
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await writeG1(fd, curve, c.delta.g1_sx);
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await writeG2(fd, curve, c.delta.g2_spx);
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await fd.write(c.transcript);
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await fd.writeULE32(c.type || 0);
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const params = [];
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if (c.name) {
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params.push(1); // Param Name
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const nameData = new TextEncoder("utf-8").encode(c.name.substring(0,64));
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params.push(nameData.byteLength);
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for (let i=0; i<nameData.byteLength; i++) params.push(nameData[i]);
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}
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if (c.type == 1) {
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params.push(2); // Param numIterationsExp
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params.push(c.numIterationsExp);
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params.push(3); // Beacon Hash
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params.push(c.beaconHash.byteLength);
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for (let i=0; i<c.beaconHash.byteLength; i++) params.push(c.beaconHash[i]);
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}
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if (params.length>0) {
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const paramsBuff = new Uint8Array(params);
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await fd.writeULE32(paramsBuff.byteLength);
|
||||
await fd.write(paramsBuff);
|
||||
} else {
|
||||
await fd.writeULE32(0);
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
async function writeMPCParams(fd, curve, mpcParams) {
|
||||
@ -382,9 +434,33 @@ async function writeMPCParams(fd, curve, mpcParams) {
|
||||
await binFileUtils.endWriteSection(fd);
|
||||
}
|
||||
|
||||
function hashG1(hasher, curve, p) {
|
||||
const buff = new Uint8Array(curve.G1.F.n8*2);
|
||||
curve.G1.toRprUncompressed(buff, 0, p);
|
||||
hasher.update(buff);
|
||||
}
|
||||
|
||||
function hashG2(hasher,curve, p) {
|
||||
const buff = new Uint8Array(curve.G2.F.n8*2);
|
||||
curve.G2.toRprUncompressed(buff, 0, p);
|
||||
hasher.update(buff);
|
||||
}
|
||||
|
||||
function hashPubKey(hasher, curve, c) {
|
||||
hashG1(hasher, curve, c.deltaAfter);
|
||||
hashG1(hasher, curve, c.delta.g1_s);
|
||||
hashG1(hasher, curve, c.delta.g1_sx);
|
||||
hashG2(hasher, curve, c.delta.g2_spx);
|
||||
hasher.update(c.transcript);
|
||||
}
|
||||
|
||||
|
||||
module.exports.readHeader = readHeader;
|
||||
module.exports.writeHeader = writeHeader;
|
||||
module.exports.read = readZKey;
|
||||
module.exports.write = writeZKey;
|
||||
module.exports.readMPCParams = readMPCParams;
|
||||
module.exports.writeMPCParams = writeMPCParams;
|
||||
module.exports.hashG1 = hashG1;
|
||||
module.exports.hashG2 = hashG2;
|
||||
module.exports.hashPubKey = hashPubKey;
|
||||
|
||||
@ -9,6 +9,7 @@ const sameRatio = misc.sameRatio;
|
||||
const crypto = require("crypto");
|
||||
const ChaCha = require("ffjavascript").ChaCha;
|
||||
const newZKey = require("./zkey_new");
|
||||
const {hashG1, hashPubKey} = require("./zkey_utils");
|
||||
|
||||
|
||||
module.exports = async function phase2verify(r1csFileName, pTauFileName, zkeyFileName, verbose) {
|
||||
@ -34,8 +35,8 @@ module.exports = async function phase2verify(r1csFileName, pTauFileName, zkeyFi
|
||||
const c = mpcParams.contributions[i];
|
||||
const ourHasher = misc.cloneHasher(accumulatedHasher);
|
||||
|
||||
hashG1(ourHasher, c.delta.g1_s);
|
||||
hashG1(ourHasher, c.delta.g1_sx);
|
||||
hashG1(ourHasher, curve, c.delta.g1_s);
|
||||
hashG1(ourHasher, curve, c.delta.g1_sx);
|
||||
|
||||
if (!misc.hashIsEqual(ourHasher.digest(), c.transcript)) {
|
||||
console.log(`INVALID(${i}): Inconsistent transcript `);
|
||||
@ -56,10 +57,10 @@ module.exports = async function phase2verify(r1csFileName, pTauFileName, zkeyFi
|
||||
return false;
|
||||
}
|
||||
|
||||
hashPubKey(accumulatedHasher, c);
|
||||
hashPubKey(accumulatedHasher, curve, c);
|
||||
|
||||
const contributionHasher = Blake2b(64);
|
||||
hashPubKey(contributionHasher, c);
|
||||
hashPubKey(contributionHasher, curve, c);
|
||||
responses.push(contributionHasher.digest());
|
||||
|
||||
curDelta = c.deltaAfter;
|
||||
@ -181,27 +182,6 @@ module.exports = async function phase2verify(r1csFileName, pTauFileName, zkeyFi
|
||||
|
||||
return true;
|
||||
|
||||
function hashG1(hasher, p) {
|
||||
const buff = new Uint8Array(sG1);
|
||||
curve.G1.toRprUncompressed(buff, 0, p);
|
||||
hasher.update(buff);
|
||||
}
|
||||
|
||||
function hashG2(hasher, p) {
|
||||
const buff = new Uint8Array(sG2);
|
||||
curve.G2.toRprUncompressed(buff, 0, p);
|
||||
hasher.update(buff);
|
||||
}
|
||||
|
||||
function hashPubKey(hasher, c) {
|
||||
hashG1(hasher, c.deltaAfter);
|
||||
hashG1(hasher, c.delta.g1_s);
|
||||
hashG1(hasher, c.delta.g1_sx);
|
||||
hashG2(hasher, c.delta.g2_spx);
|
||||
hasher.update(c.transcript);
|
||||
}
|
||||
|
||||
|
||||
|
||||
async function sectionHasSameRatio(groupName, fd1, sections1, fd2, sections2, idSection, g2sp, g2spx, sectionName) {
|
||||
const MAX_CHUNK_SIZE = 1<<20;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user