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Improvement in multiexp

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This commit is contained in:
Jordi Baylina 2019-04-27 07:09:17 +02:00
parent cd5cb59ecd
commit 0c19558260
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GPG Key ID: 7480C80C1BE43112
10 changed files with 368 additions and 20 deletions
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2
build/groth16_wasm.js
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7
build/websnark.js
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38
example/index.html
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@ -5,7 +5,7 @@
<script>
var witness;
var proving_key;
var provingKey;
function onLoad() {
@ -35,6 +35,42 @@ function calcProof() {
});
}
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>

16
example/proof.json
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@ -1,17 +1,17 @@
{
"pi_a": [
"21266998874284424955919569029881989465699205822263354313670808828909395154496",
"13808207576200570409195938017448994370347750586807229689124956313666939364223",
"19680154454022615560994181976731030733614160737391726320224655882461434003166",
"14506888714805765338667645951908780974880796110792314129555830081443197782938",
"1"
],
"pi_b": [
[
"20826174028125964218380958569361176477127093215239661788856774751838141561143",
"18124837593398705925374973761391356712682789028723957898056733210681657516129"
"16059656683940257022054872908684774362474111955649045792819322627462560715137",
"13049852697262082406165451331450805322803524667445339527980660565015589621048"
],
[
"11061422325891624289091287264538564377906983481144726751439738589444312205684",
"7233025874448062341952037774861209177679802086176943726704101043680595476782"
"20605106377063342149927518751710651784145311256228815403731163542864993273015",
"21378404564638469836584392472267247126799346914748790175589924808523044347833"
],
[
"1",
@ -19,8 +19,8 @@
]
],
"pi_c": [
"16878419494624994424179370797390123339814891459464251523862017440818718425099",
"2746788445790348352996135341367179450489222192737650564198988415207995710311",
"16518590357890849860540962532185420206527846553862686657897809347816474967134",
"442279217743037306980955273644081896885475014739846912647180713387538594883",
"1"
]
}

4
example/proving_key.json
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@ -1,4 +1,4 @@
{
{
"protocol": "groth",
"nVars": 66232,
"nPublic": 58,
@ -2884580,4 +2884580,4 @@
"1"
]
]
}
}

7
example/websnark.js
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1
main.js
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@ -22,6 +22,7 @@
const buildGroth16 = require("./src/groth16.js");
buildGroth16().then( (groth16) => {
window.groth16 = groth16;
window.genZKSnarkProof = function(witness, provingKey, cb) {
const p = groth16.proof(witness, provingKey);

266
src/build_multiexp.js
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@ -428,6 +428,7 @@ module.exports = function buildMultiexp(module, prefix, curvePrefix, pointFieldP
f.addCode(c.getLocal("pr"));
}
function buildMulw() {
const f = module.addFunction(prefix+"__mulw");
f.addParam("pscalars", "i32");
@ -578,6 +579,264 @@ module.exports = function buildMultiexp(module, prefix, curvePrefix, pointFieldP
));
}
function buildMulw2() {
const f = module.addFunction(prefix+"__mulw2");
f.addParam("pscalars", "i32");
f.addParam("ppoints", "i32");
f.addParam("w", "i32"); // Window size Max 8
f.addParam("pr", "i32");
f.addLocal("i", "i32");
f.addLocal("pd", "i32");
const c = f.getCodeBuilder();
const psels = module.alloc(scalarN8 * 8);
f.addCode(c.call(
prefix + "__packbits",
c.getLocal("pscalars"),
c.getLocal("w"),
c.i32_const(psels)
));
f.addCode(c.call(
prefix + "__ptable_reset",
c.getLocal("ppoints"),
c.getLocal("w")
));
f.addCode(c.setLocal("i", c.i32_const(0)));
f.addCode(c.block(c.loop(
c.br_if(
1,
c.i32_eq(
c.getLocal("i"),
c.i32_const(scalarN8 * 8)
)
),
c.setLocal(
"pd",
c.i32_add(
c.getLocal("pr"),
c.i32_mul(
c.getLocal("i"),
c.i32_const(pointN8)
)
)
),
c.call(curvePrefix + "_add",
c.getLocal("pd"),
c.call(
prefix + "__ptable_get",
c.i32_load8_u(
c.i32_sub(
c.i32_const(psels + scalarN8 * 8 -1),
c.getLocal("i")
)
)
),
c.getLocal("pd")
),
c.setLocal("i", c.i32_add(c.getLocal("i"), c.i32_const(1))),
c.br(0)
)));
}
function buildMultiexp2() {
const f = module.addFunction(prefix+"_multiexp2");
f.addParam("pscalars", "i32");
f.addParam("ppoints", "i32");
f.addParam("n", "i32"); // Number of points
f.addParam("w", "i32"); // Window size Max 8
f.addParam("pr", "i32");
f.addLocal("ps", "i32");
f.addLocal("pp", "i32");
f.addLocal("wf", "i32");
f.addLocal("lastps", "i32");
const c = f.getCodeBuilder();
const accumulators = c.i32_const(module.alloc(pointN8*scalarN8*8));
const aux = c.i32_const(module.alloc(pointN8));
f.addCode(c.call(prefix + "__resetAccumulators", accumulators, c.i32_const(scalarN8*8)));
f.addCode(c.setLocal("ps", c.getLocal("pscalars")));
f.addCode(c.setLocal("pp", c.getLocal("ppoints")));
f.addCode(c.setLocal(
"lastps",
c.i32_add(
c.getLocal("ps"),
c.i32_mul(
c.i32_mul(
c.i32_div_u(
c.getLocal("n"),
c.getLocal("w")
),
c.getLocal("w")
),
c.i32_const(scalarN8)
)
)
));
f.addCode(c.block(c.loop(
c.br_if(
1,
c.i32_eq(
c.getLocal("ps"),
c.getLocal("lastps")
)
),
c.call(prefix + "__mulw2", c.getLocal("ps"), c.getLocal("pp"), c.getLocal("w"), accumulators),
c.setLocal(
"ps",
c.i32_add(
c.getLocal("ps"),
c.i32_mul(
c.i32_const(scalarN8),
c.getLocal("w")
)
)
),
c.setLocal(
"pp",
c.i32_add(
c.getLocal("pp"),
c.i32_mul(
c.i32_const(pointFieldN8*2),
c.getLocal("w")
)
)
),
c.br(0)
)));
f.addCode(c.setLocal("wf", c.i32_rem_u(c.getLocal("n"), c.getLocal("w"))));
f.addCode(c.if(
c.getLocal("wf"),
[
...c.call(prefix + "__mulw2", c.getLocal("ps"), c.getLocal("pp"), c.getLocal("wf"), accumulators),
]
));
f.addCode(c.call(
prefix + "__addAccumulators",
accumulators,
c.i32_const(scalarN8*8),
aux
));
f.addCode(c.call(curvePrefix + "_add", aux, c.getLocal("pr"), c.getLocal("pr")));
}
function buildResetAccumulators() {
const f = module.addFunction(prefix+"__resetAccumulators");
f.addParam("paccumulators", "i32");
f.addParam("n", "i32"); // Number of points
f.addLocal("i", "i32");
const c = f.getCodeBuilder();
f.addCode(c.setLocal("i", c.i32_const(0)));
f.addCode(c.block(c.loop(
c.br_if(
1,
c.i32_eq(
c.getLocal("i"),
c.getLocal("n")
)
),
c.call(
curvePrefix + "_zero",
c.i32_add(
c.getLocal("paccumulators"),
c.i32_mul(
c.getLocal("i"),
c.i32_const(pointN8)
)
)
),
c.setLocal("i", c.i32_add(c.getLocal("i"), c.i32_const(1))),
c.br(0)
)));
}
function buildAddAccumulators() {
const f = module.addFunction(prefix+"__addAccumulators");
f.addParam("paccumulators", "i32");
f.addParam("n", "i32"); // Number of points
f.addParam("pr", "i32");
f.addLocal("i", "i32");
f.addLocal("p", "i32");
const c = f.getCodeBuilder();
/*
f.addCode(c.setLocal(
"p",
c.i32_add(
c.getLocal("paccumulators"),
c.i32_sub(
c.i32_mul(
c.getLocal("n"),
c.i32_const(pointN8)
),
c.i32_const(pointN8)
)
)
));
*/
f.addCode(c.setLocal("p",c.getLocal("paccumulators")));
f.addCode(c.call(curvePrefix + "_copy", c.getLocal("p"), c.getLocal("pr")));
f.addCode(c.setLocal("p", c.i32_add(c.getLocal("p"), c.i32_const(pointN8))));
f.addCode(c.setLocal("i", c.i32_const(1)));
f.addCode(c.block(c.loop(
c.br_if(
1,
c.i32_eq(
c.getLocal("i"),
c.getLocal("n")
)
),
c.call(
curvePrefix + "_double",
c.getLocal("pr"),
c.getLocal("pr")
),
c.call(
curvePrefix + "_add",
c.getLocal("p"),
c.getLocal("pr"),
c.getLocal("pr")
),
c.setLocal("p", c.i32_add(c.getLocal("p"), c.i32_const(pointN8))),
c.setLocal("i", c.i32_add(c.getLocal("i"), c.i32_const(1))),
c.br(0)
)));
}
buildSetSet();
buildSetIsSet();
buildPTableReset();
@ -585,7 +844,14 @@ module.exports = function buildMultiexp(module, prefix, curvePrefix, pointFieldP
buildPackBits();
buildMulw();
buildMultiexp();
buildMulw2();
buildResetAccumulators();
buildAddAccumulators();
buildMultiexp2();
module.exportFunction(prefix+"_multiexp");
module.exportFunction(prefix+"_multiexp2");
};

4
src/groth16.js
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@ -101,7 +101,7 @@ function thread(self) {
const pPoints = putBin(data.points);
const pRes = alloc(96);
instance.exports.g1_zero(pRes);
instance.exports.g1_multiexp(pScalars, pPoints, data.n, 5, pRes);
instance.exports.g1_multiexp2(pScalars, pPoints, data.n, 7, pRes);
data.result = getBin(pRes, 96);
i32[0] = oldAlloc;
@ -113,7 +113,7 @@ function thread(self) {
const pPoints = putBin(data.points);
const pRes = alloc(192);
instance.exports.g2_zero(pRes);
instance.exports.g2_multiexp(pScalars, pPoints, data.n, 5, pRes);
instance.exports.g2_multiexp(pScalars, pPoints, data.n, 7, pRes);
data.result = getBin(pRes, 192);
i32[0] = oldAlloc;

43
test/groth16.js
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@ -7,6 +7,48 @@ const snarkjs = require("snarkjs");
const buildGroth16 = require("../index.js").buildGroth16;
describe("Basic tests for groth16 proof generator", () => {
it("should do basic multiexponentiation", async () => {
const groth16 = await buildGroth16();
const signalsAll = fs.readFileSync(path.join(__dirname, "data", "witness.bin"));
const provingKey = fs.readFileSync(path.join(__dirname, "data", "proving_key.bin"));
const nSignals = 1;
const pkey32 = new Uint32Array(provingKey);
const pPointsA = pkey32[5];
const points = provingKey.slice(pPointsA, pPointsA + nSignals*64);
const signals = signalsAll.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));
assert.equal(r1[0],r2[0]);
assert.equal(r1[1],r2[1]);
groth16.terminate();
});
it("It should do a basic point doubling G1", async () => {
const groth16 = await buildGroth16();
@ -22,4 +64,5 @@ describe("Basic tests for groth16 proof generator", () => {
groth16.terminate();
}).timeout(10000000);
});