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Merge branch 'master' of github.com:iden3/circomlib

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Jordi Baylina 2019-06-04 17:36:54 +02:00
commit 154a9bcbae
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GPG Key ID: 7480C80C1BE43112
8 changed files with 183 additions and 48 deletions
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14
circuits/README.md Normal file
View File

@ -0,0 +1,14 @@
* compconstant - Returns 1 if `in` (expanded to binary array) > `ct`
* aliascheck - check if `in` (expanded to binary array) oveflowed its 254 bits (<= -1)
* babyjub - twisted Edwards curve 168700.x^2 + y^2 = 1 + 168696.x^2.y^2
* BabyAdd - (`xout`,`yout`) = (`x1`,`y1`) + (`x2`,`y2`)
* BabyDbl - (`xout`,`yout`) = 2*(`x`,`y`)
* BabyCheck - check that (`x`,`y`) is on the curve
* binsub - binary subtraction
* gates - logical gates
* mimc - SNARK-friendly hash Minimal Multiplicative Complexity.
* https://eprint.iacr.org/2016/492.pdf
* zcash/zcash#2233
* smt - Sparse Merkle Tree
* https://ethresear.ch/t/optimizing-sparse-merkle-trees/3751
* montgomery https://en.wikipedia.org/wiki/Montgomery_curve

27
circuits/babyjub.circom
View File

@ -17,6 +17,9 @@
along with circom. If not, see <https://www.gnu.org/licenses/>.
*/
include "bitify.circom";
include "escalarmulfix.circom";
template BabyAdd() {
signal input x1;
signal input y1;
@ -77,3 +80,27 @@ template BabyCheck() {
a*x2 + y2 === 1 + d*x2*y2;
}
// Extracts the public key from private key
template BabyPbk() {
signal private input in;
signal output Ax;
signal output Ay;
var BASE8 = [
17777552123799933955779906779655732241715742912184938656739573121738514868268,
2626589144620713026669568689430873010625803728049924121243784502389097019475
];
component pvkBits = Num2Bits(253);
pvkBits.in <== in;
component mulFix = EscalarMulFix(253, BASE8);
var i;
for (i=0; i<253; i++) {
mulFix.e[i] <== pvkBits.out[i];
}
Ax <== mulFix.out[0];
Ay <== mulFix.out[1];
}

15
circuits/multiplexer.circom
View File

@ -90,12 +90,17 @@ template Decoder(w) {
}
template Multiplexor(wIn, nIn) {
template Multiplexer(wIn, nIn) {
signal input inp[nIn][wIn];
signal input sel;
signal output out[wIn];
component Decoder(nIn) dec;
component EscalarProduct(nIn) ep[wIn];
component dec = Decoder(nIn);
component ep[wIn];
for (var k=0; k<wIn; k++) {
ep[k] = EscalarProduct(nIn);
}
sel ==> dec.inp;
for (var j=0; j<wIn; j++) {
for (var k=0; k<nIn; k++) {
@ -106,7 +111,3 @@ template Multiplexor(wIn, nIn) {
}
dec.success === 1;
}
component Multiplexor(8,3) main;

134
package-lock.json generated
View File

@ -2365,7 +2365,8 @@
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@ -3546,17 +3557,8 @@
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@ -3566,10 +3568,29 @@
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"rlp": "^2.0.0",
"safe-buffer": "^5.1.1",
"secp256k1": "^3.0.1"
}
}
}
},
"ws": {
@ -7133,20 +7185,25 @@
"optional": true,
"requires": {
"underscore": "1.8.3",
"web3-core-helpers": "1.0.0-beta.35"
"web3-core-helpers": "1.0.0-beta.35",
"websocket": "git://github.com/frozeman/WebSocket-Node.git#browserifyCompatible"
},
"dependencies": {
"debug": {
"version": "2.6.9",
"resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
"integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
"dev": true,
"optional": true,
"requires": {
"ms": "2.0.0"
}
},
"websocket": {
"version": "git://github.com/frozeman/WebSocket-Node.git#6c72925e3f8aaaea8dc8450f97627e85263999f2",
"from": "git://github.com/frozeman/WebSocket-Node.git#6c72925e3f8aaaea8dc8450f97627e85263999f2",
"from": "git://github.com/frozeman/WebSocket-Node.git#browserifyCompatible",
"dev": true,
"optional": true,
"requires": {
"debug": "^2.2.0",
"nan": "^2.3.3",
@ -7332,7 +7389,8 @@
"yaeti": {
"version": "0.0.6",
"resolved": "https://registry.npmjs.org/yaeti/-/yaeti-0.0.6.tgz",
"integrity": "sha1-8m9ITXJoTPQr7ft2lwqhYI+/lXc="
"integrity": "sha1-8m9ITXJoTPQr7ft2lwqhYI+/lXc=",
"dev": true
},
"yargs": {
"version": "4.8.1",

1
package.json
View File

@ -26,6 +26,7 @@
"dependencies": {
"blake-hash": "^1.1.0",
"snarkjs": "0.1.11",
"typedarray-to-buffer": "^3.1.5",
"web3": "^1.0.0-beta.36"
},
"devDependencies": {

8
src/babyjub.js
View File

@ -22,8 +22,14 @@ function addPoint(a,b) {
const d = bigInt("168696");
const res = [];
res[0] = bigInt((a[0]*b[1] + b[0]*a[1]) * bigInt(bigInt("1") + d*a[0]*b[0]*a[1]*b[1]).inverse(q)).affine(q);
/* does the equivalent of:
res[0] = bigInt((a[0]*b[1] + b[0]*a[1]) * bigInt(bigInt("1") + d*a[0]*b[0]*a[1]*b[1]).inverse(q)).affine(q);
res[1] = bigInt((a[1]*b[1] - cta*a[0]*b[0]) * bigInt(bigInt("1") - d*a[0]*b[0]*a[1]*b[1]).inverse(q)).affine(q);
*/
res[0] = bigInt((bigInt(a[0]).mul(b[1]).add(bigInt(b[0]).mul(a[1]))).mul(bigInt(bigInt("1").add(d.mul(a[0]).mul(b[0]).mul(a[1]).mul(b[1]))).inverse(q))).affine(q);
res[1] = bigInt((bigInt(a[1]).mul(b[1]).sub(cta.mul(a[0]).mul(b[0]))).mul(bigInt(bigInt("1").sub(d.mul(a[0]).mul(b[0]).mul(a[1]).mul(b[1]))).inverse(q))).affine(q);
return res;
}

29
test/babyjub.js
View File

@ -3,10 +3,12 @@ const path = require("path");
const snarkjs = require("snarkjs");
const compiler = require("circom");
const createBlakeHash = require("blake-hash");
const eddsa = require("../src/eddsa.js");
const assert = chai.assert;
const bigInt = require("big-integer");
const bigInt = require("snarkjs").bigInt;
describe("Baby Jub test", function () {
let circuitAdd;
@ -22,6 +24,11 @@ describe("Baby Jub test", function () {
const cirDefTest = await compiler(path.join(__dirname, "circuits", "babycheck_test.circom"));
circuitTest = new snarkjs.Circuit(cirDefTest);
console.log("NConstrains BabyTest: " + circuitTest.nConstraints);
const cirDefPbk = await compiler(path.join(__dirname, "circuits", "babypbk_test.circom"));
circuitPbk = new snarkjs.Circuit(cirDefPbk);
console.log("NConstrains BabyPbk: " + circuitPbk.nConstraints);
});
it("Should add point (0,1) and (0,1)", async () => {
@ -97,4 +104,22 @@ describe("Baby Jub test", function () {
}
});
it("Should extract the public key from the private one", async () => {
const rawpvk = Buffer.from("0001020304050607080900010203040506070809000102030405060708090021", "hex");
const pvk = eddsa.pruneBuffer(createBlakeHash("blake512").update(rawpvk).digest().slice(0,32));
const S = bigInt.leBuff2int(pvk).shr(3);
const A = eddsa.prv2pub(rawpvk);
const input = {
in : S,
Ax : A[0],
Ay : A[1]
}
const w = circuitPbk.calculateWitness(input);
assert(circuitPbk.checkWitness(w));
});
});

3
test/circuits/babypbk_test.circom Normal file
View File

@ -0,0 +1,3 @@
include "../../circuits/babyjub.circom";
component main = BabyPbk();