0.0.7

Combined small fixes

calcpedersenbases/calcpedersenbases.js

@@ -1,14 +1,15 @@
 const bn128 = require("snarkjs").bn128;
 const bigInt = require("snarkjs").bigInt;
 const createBlakeHash = require("blake-hash");
-const assert = require("assert");
 const babyJub = require("../src/babyjub");
 
 function getPoint(S) {
     const F = bn128.Fr;
     const h = createBlakeHash("blake256").update(S).digest();
 
-    assert(h.length == 32);
+    if (h.length != 32) {
+        throw new Error("Invalid length")
+    }
 
     let sign = false;
     if (h[31] & 0x80) {
@@ -52,7 +53,9 @@ function generatePoint(S) {
         p = getPoint(S+"_"+sidx);
         idx++;
     }
-    assert(babyJub.inCurve(p), "Point not in curve");
+    if (!babyJub.inCurve(p)){
+        throw new Error("Point not in curve");
+    }
     return p;
 }
 

circuits/eddsamimc.circom

@@ -58,6 +58,7 @@ template EdDSAMiMCVerifier() {
     hash.in[2] <== Ax;
     hash.in[3] <== Ay;
     hash.in[4] <== M;
+    hash.k <== 0;
 
     component h2bits = Num2Bits_strict();
     h2bits.in <== hash.out;

circuits/mimc.circom

@@ -137,18 +137,19 @@ template MiMC7(nrounds) {
 
 template MultiMiMC7(nInputs, nRounds) {
     signal input in[nInputs];
+    signal input k;
     signal output out;
+    signal r[nInputs +1];
 
     component mims[nInputs];
+
+    r[0] <== k;
     for (var i=0; i<nInputs; i++) {
         mims[i] = MiMC7(nRounds);
-        if (i==0) {
-            mims[i].x_in <== 15021630795539610737508582392395901278341266317943626182700664337106830745361;
-        } else {
-            mims[i].x_in <== mims[i-1].out;
-        }
-        mims[i].k <== in[i];
+        mims[i].x_in <== in[i];
+        mims[i].k <== r[i];
+        r[i+1] <== r[i] + in[i] + mims[i].out;
     }
 
-    out <== mims[nInputs-1].out;
+    out <== r[nInputs];
 }

circuits/smt/smthash.circom

@@ -29,19 +29,12 @@ template SMTHash1() {
     signal input value;
     signal output out;
 
-    component h1 = MiMC7(91);   // Constant
-    h1.x_in <== 15021630795539610737508582392395901278341266317943626182700664337106830745361;
-    h1.k <== 1;
+    component h = MultiMiMC7(2, 91);   // Constant
+    h.in[0] <== key;
+    h.in[1] <== value;
+    h.k <== 1;
 
-    component h2 = MiMC7(91);
-    h2.x_in <== h1.out;
-    h2.k <== key;
-
-    component h3 = MiMC7(91);
-    h3.x_in <== h2.out;
-    h3.k <== value;
-
-    out <== h3.out;
+    out <== h.out;
 }
 
 /*
@@ -55,13 +48,10 @@ template SMTHash2() {
     signal input R;
     signal output out;
 
-    component h1 = MiMC7(91);
-    h1.x_in <== 15021630795539610737508582392395901278341266317943626182700664337106830745361;
-    h1.k <== L;
+    component h = MultiMiMC7(2, 91);   // Constant
+    h.in[0] <== L;
+    h.in[1] <== R;
+    h.k <== 0;
 
-    component h2 = MiMC7(91);
-    h2.x_in <== h1.out;
-    h2.k <== R;
-
-    out <== h2.out;
+    out <== h.out;
 }

index.js

@@ -1,3 +1,4 @@
 exports.smt = require("./src/smt");
 exports.eddsa = require("./src/eddsa");
 exports.mimc7 = require("./src/mimc7");
+exports.babyJub = require("./src/babyjub");

package.json

@@ -1,6 +1,6 @@
 {
   "name": "circomlib",
-  "version": "0.0.5",
+  "version": "0.0.7",
   "description": "Basic circuits library for Circom",
   "main": "index.js",
   "directories": {
@@ -25,7 +25,7 @@
   "license": "GPL-3.0",
   "dependencies": {
     "blake-hash": "^1.1.0",
-    "snarkjs": "0.1.9",
+    "snarkjs": "0.1.11",
     "web3": "^1.0.0-beta.36"
   },
   "devDependencies": {

src/eddsa.js

@@ -3,9 +3,7 @@ const bigInt = require("snarkjs").bigInt;
 const babyJub = require("./babyjub");
 const pedersenHash = require("./pedersenHash").hash;
 const mimc7 = require("./mimc7");
-const crypto = require("crypto");
 
-exports.cratePrvKey = cratePrvKey;
 exports.prv2pub= prv2pub;
 exports.sign = sign;
 exports.signMiMC = signMiMC;
@@ -13,12 +11,9 @@ exports.verify = verify;
 exports.verifyMiMC = verifyMiMC;
 exports.packSignature = packSignature;
 exports.unpackSignature = unpackSignature;
+exports.pruneBuffer = pruneBuffer;
 
 
-function cratePrvKey() {
-    return crypto.randomBytes(32);
-}
-
 function pruneBuffer(_buff) {
     const buff = Buffer.from(_buff);
     buff[0] = buff[0] & 0xF8;

src/evmasm.js

@@ -3,8 +3,7 @@
 //
 
 
-const Web3 = require("web3");
-const assert = require("assert");
+const Web3Utils = require("web3-utils");
 
 class Contract {
     constructor() {
@@ -39,7 +38,7 @@ class Contract {
             genLoadedLength = C.code.length;
         }
 
-        return Web3.utils.bytesToHex(C.code.concat(this.code));
+        return Web3Utils.bytesToHex(C.code.concat(this.code));
     }
 
     stop() { this.code.push(0x00); }
@@ -141,7 +140,9 @@ class Contract {
     msize()  { this.code.push(0x59); }
     gas()  { this.code.push(0x5a); }
     label(name)  {
-        assert(typeof this.labels[name] == "undefined", "Label already defined");
+        if (typeof this.labels[name] != "undefined") {
+            throw new Error("Label already defined");
+        }
         this.labels[name] = this.code.length;
         this.code.push(0x5b);
 
@@ -149,21 +150,24 @@ class Contract {
     }
 
     push(data) {
-        const d = Web3.utils.hexToBytes(Web3.utils.toHex(data));
-        assert(d.length>0);
-        assert(d.length<=32);
+        const d = Web3Utils.hexToBytes(Web3Utils.toHex(data));
+        if (d.length == 0 || d.length > 32) {
+            throw new Error("Assertion failed");
+        }
         this.code = this.code.concat([0x5F + d.length], d);
     }
 
     dup(n) {
-        assert(n>=0);
-        assert(n<16);
+        if (n < 0 || n >= 16) {
+            throw new Error("Assertion failed");
+        }
         this.code.push(0x80 + n);
     }
 
     swap(n) {
-        assert(n>=1);
-        assert(n<=16);
+        if (n < 1 || n > 16) {
+            throw new Error("Assertion failed");
+        }
         this.code.push(0x8f + n);
     }
 

src/mimc7.js

@@ -1,6 +1,6 @@
 const bn128 = require("snarkjs").bn128;
 const bigInt = require("snarkjs").bigInt;
-const Web3 = require("web3");
+const Web3Utils = require("web3-utils");
 const F = bn128.Fr;
 
 const SEED = "mimc";
@@ -8,8 +8,8 @@ const NROUNDS = 91;
 
 exports.getIV = (seed) => {
     if (typeof seed === "undefined") seed = SEED;
-    const c = Web3.utils.keccak256(seed+"_iv");
-    const cn = bigInt(Web3.utils.toBN(c).toString());
+    const c = Web3Utils.keccak256(seed+"_iv");
+    const cn = bigInt(Web3Utils.toBN(c).toString());
     const iv = cn.mod(F.q);
     return iv;
 };
@@ -18,13 +18,13 @@ exports.getConstants = (seed, nRounds) => {
     if (typeof seed === "undefined") seed = SEED;
     if (typeof nRounds === "undefined") nRounds = NROUNDS;
     const cts = new Array(nRounds);
-    let c = Web3.utils.keccak256(SEED);
+    let c = Web3Utils.keccak256(SEED);
     for (let i=1; i<nRounds; i++) {
-        c = Web3.utils.keccak256(c);
+        c = Web3Utils.keccak256(c);
 
-        const n1 = Web3.utils.toBN(c).mod(Web3.utils.toBN(F.q.toString()));
-        const c2 = Web3.utils.padLeft(Web3.utils.toHex(n1), 64);
-        cts[i] = bigInt(Web3.utils.toBN(c2).toString());
+        const n1 = Web3Utils.toBN(c).mod(Web3Utils.toBN(F.q.toString()));
+        const c2 = Web3Utils.padLeft(Web3Utils.toHex(n1), 64);
+        cts[i] = bigInt(Web3Utils.toBN(c2).toString());
     }
     cts[0] = bigInt(0);
     return cts;
@@ -44,10 +44,21 @@ exports.hash =  (_x_in, _k) =>{
     return F.affine(F.add(r, k));
 };
 
-exports.multiHash = (arr) => {
-    let r = exports.getIV();
-    for (let i=0; i<arr.length; i++) {
-        r = exports.hash(r, bigInt(arr[i]));
+exports.multiHash = (arr, key) => {
+    let r;
+    if (typeof(key) === "undefined") {
+        r = F.zero;
+    } else {
+        r = key;
     }
-    return r;
+    for (let i=0; i<arr.length; i++) {
+        r = F.add(
+            F.add(
+                r,
+                arr[i]
+            ),
+            exports.hash(bigInt(arr[i]), r)
+        );
+    }
+    return F.affine(r);
 };

src/mimc_gencontract.js

@@ -2,13 +2,13 @@
 // License: LGPL-3.0+
 //
 
-const Web3 = require("web3");
+const Web3Utils = require("web3-utils");
 
 const Contract = require("./evmasm");
 
 function createCode(seed, n) {
 
-    let ci = Web3.utils.keccak256(seed);
+    let ci = Web3Utils.keccak256(seed);
 
     const C = new Contract();
 
@@ -51,7 +51,7 @@ function createCode(seed, n) {
     C.mulmod();         // r=t^7 k q
 
     for (let i=0; i<n-1; i++) {
-        ci = Web3.utils.keccak256(ci);
+        ci = Web3Utils.keccak256(ci);
         C.dup(2);       // q r k q
         C.dup(0);       // q q r k q
         C.dup(0);       // q q q r k q

src/pedersenHash.js

@@ -1,7 +1,6 @@
 const bn128 = require("snarkjs").bn128;
 const bigInt = require("snarkjs").bigInt;
 const babyJub = require("./babyjub");
-const assert = require("assert");
 const createBlakeHash = require("blake-hash");
 
 const GENPOINT_PREFIX = "PedersenGenerator";
@@ -73,7 +72,9 @@ function getBasePoint(pointIdx) {
 
     const p8 = babyJub.mulPointEscalar(p, 8);
 
-    assert(babyJub.inSubgroup(p8), "Point not in curve");
+    if (!babyJub.inSubgroup(p8)) {
+        throw new Error("Point not in curve");
+    }
 
     bases[pointIdx] = p8;
     return p8;

src/smt.js

@@ -46,8 +46,8 @@ class SMT {
         const ins = [];
         const dels = [];
 
-        let rtOld = mimc7.multiHash([1, key, resFind.foundValue]);
-        let rtNew = mimc7.multiHash([1, key, newValue]);
+        let rtOld = mimc7.multiHash([key, resFind.foundValue], bigInt.one);
+        let rtNew = mimc7.multiHash([key, newValue], bigInt.one);
         ins.push([rtNew, [1, key, newValue ]]);
         dels.push(rtOld);
 
@@ -59,11 +59,11 @@ class SMT {
                 oldNode = [sibling, rtOld];
                 newNode = [sibling, rtNew];
             } else {
-                oldNode = [rtOld, sibling, ];
-                newNode = [rtNew, sibling, ];
+                oldNode = [rtOld, sibling];
+                newNode = [rtNew, sibling];
             }
-            rtOld = mimc7.multiHash(oldNode);
-            rtNew = mimc7.multiHash(newNode);
+            rtOld = mimc7.multiHash(oldNode, bigInt.zero);
+            rtNew = mimc7.multiHash(newNode, bigInt.zero);
             dels.push(rtOld);
             ins.push([rtNew, newNode]);
         }
@@ -92,7 +92,7 @@ class SMT {
 
         const dels = [];
         const ins = [];
-        let rtOld = mimc7.multiHash([1, key, resFind.foundValue]);
+        let rtOld = mimc7.multiHash([key, resFind.foundValue], bigInt.one);
         let rtNew;
         dels.push(rtOld);
 
@@ -130,9 +130,9 @@ class SMT {
             }
             const oldSibling = resFind.siblings[level];
             if (keyBits[level]) {
-                rtOld = mimc7.multiHash([oldSibling, rtOld]);
+                rtOld = mimc7.multiHash([oldSibling, rtOld], bigInt.zero);
             } else {
-                rtOld = mimc7.multiHash([rtOld, oldSibling]);
+                rtOld = mimc7.multiHash([rtOld, oldSibling], bigInt.zero);
             }
             dels.push(rtOld);
             if (!newSibling.isZero()) {
@@ -147,7 +147,7 @@ class SMT {
                 } else {
                     newNode = [rtNew, newSibling];
                 }
-                rtNew = mimc7.multiHash(newNode);
+                rtNew = mimc7.multiHash(newNode, bigInt.zero);
                 ins.push([rtNew, newNode]);
             }
         }
@@ -185,7 +185,7 @@ class SMT {
             for (let i= res.siblings.length; oldKeyits[i] == newKeyBits[i]; i++) {
                 res.siblings.push(bigInt.zero);
             }
-            rtOld = mimc7.multiHash([1, resFind.notFoundKey, resFind.notFoundValue]);
+            rtOld = mimc7.multiHash([resFind.notFoundKey, resFind.notFoundValue], bigInt.one);
             res.siblings.push(rtOld);
             addedOne = true;
             mixed = false;
@@ -197,7 +197,7 @@ class SMT {
         const inserts = [];
         const dels = [];
 
-        let rt = mimc7.multiHash([1, key, value]);
+        let rt = mimc7.multiHash([key, value], bigInt.one);
         inserts.push([rt,[1, key, value]] );
 
         for (let i=res.siblings.length-1; i>=0; i--) {
@@ -207,9 +207,9 @@ class SMT {
             if (mixed) {
                 const oldSibling = resFind.siblings[i];
                 if (newKeyBits[i]) {
-                    rtOld = mimc7.multiHash([oldSibling, rtOld]);
+                    rtOld = mimc7.multiHash([oldSibling, rtOld], bigInt.zero);
                 } else {
-                    rtOld = mimc7.multiHash([rtOld, oldSibling]);
+                    rtOld = mimc7.multiHash([rtOld, oldSibling], bigInt.zero);
                 }
                 dels.push(rtOld);
             }
@@ -217,10 +217,10 @@ class SMT {
 
             let newRt;
             if (newKeyBits[i]) {
-                newRt = mimc7.multiHash([res.siblings[i], rt]);
+                newRt = mimc7.multiHash([res.siblings[i], rt], bigInt.zero);
                 inserts.push([newRt,[res.siblings[i], rt]] );
             } else {
-                newRt = mimc7.multiHash([rt, res.siblings[i]]);
+                newRt = mimc7.multiHash([rt, res.siblings[i]],  bigInt.zero);
                 inserts.push([newRt,[rt, res.siblings[i]]] );
             }
             rt = newRt;

test/eddsa.js

@@ -2,6 +2,7 @@ const chai = require("chai");
 const path = require("path");
 const snarkjs = require("snarkjs");
 const compiler = require("circom");
+// const crypto = require("crypto");
 
 const eddsa = require("../src/eddsa.js");
 const babyJub = require("../src/babyjub.js");
@@ -45,7 +46,7 @@ describe("EdDSA test", function () {
     it("Sign a single 10 bytes from 0 to 9", async () => {
         const msg = Buffer.from("00010203040506070809", "hex");
 
-//        const prvKey = eddsa.cratePrvKey();
+//        const prvKey = crypto.randomBytes(32);
 
         const prvKey = Buffer.from("0001020304050607080900010203040506070809000102030405060708090001", "hex");
 

test/eddsamimc.js

@@ -9,7 +9,7 @@ const assert = chai.assert;
 
 const bigInt = snarkjs.bigInt;
 
-describe("EdDSA test", function () {
+describe("EdDSA MiMC test", function () {
     let circuit;
 
     this.timeout(100000);