diff --git a/circuits/eddsamimcsponge.circom b/circuits/eddsamimcsponge.circom
new file mode 100644
index 0000000..419fb91
--- /dev/null
+++ b/circuits/eddsamimcsponge.circom
@@ -0,0 +1,123 @@
+/*
+ Copyright 2018 0KIMS association.
+
+ This file is part of circom (Zero Knowledge Circuit Compiler).
+
+ circom is a free software: you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ circom is distributed in the hope that it will be useful, but WITHOUT
+ ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
+ License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with circom. If not, see .
+*/
+
+include "compconstant.circom";
+include "pointbits.circom";
+include "mimcsponge.circom";
+include "bitify.circom";
+include "escalarmulany.circom";
+include "escalarmulfix.circom";
+
+template EdDSAMiMCSpongeVerifier() {
+ signal input enabled;
+ signal input Ax;
+ signal input Ay;
+
+ signal input S;
+ signal input R8x;
+ signal input R8y;
+
+ signal input M;
+
+ var i;
+
+// Ensure S compConstant.in[i];
+ }
+ compConstant.in[253] <== 0;
+ compConstant.out === 0;
+
+// Calculate the h = H(R,A, msg)
+
+ component hash = MiMCSponge(5, 220, 1);
+ hash.ins[0] <== R8x;
+ hash.ins[1] <== R8y;
+ hash.ins[2] <== Ax;
+ hash.ins[3] <== Ay;
+ hash.ins[4] <== M;
+ hash.k <== 0;
+
+ component h2bits = Num2Bits_strict();
+ h2bits.in <== hash.outs[0];
+
+// Calculate second part of the right side: right2 = h*8*A
+
+ // Multiply by 8 by adding it 3 times. This also ensure that the result is in
+ // the subgroup.
+ component dbl1 = BabyDbl();
+ dbl1.x <== Ax;
+ dbl1.y <== Ay;
+ component dbl2 = BabyDbl();
+ dbl2.x <== dbl1.xout;
+ dbl2.y <== dbl1.yout;
+ component dbl3 = BabyDbl();
+ dbl3.x <== dbl2.xout;
+ dbl3.y <== dbl2.yout;
+
+ // We check that A is not zero.
+ component isZero = IsZero();
+ isZero.in <== dbl3.x;
+ isZero.out === 0;
+
+ component mulAny = EscalarMulAny(254);
+ for (i=0; i<254; i++) {
+ mulAny.e[i] <== h2bits.out[i];
+ }
+ mulAny.p[0] <== dbl3.xout;
+ mulAny.p[1] <== dbl3.yout;
+
+
+// Compute the right side: right = R8 + right2
+
+ component addRight = BabyAdd();
+ addRight.x1 <== R8x;
+ addRight.y1 <== R8y;
+ addRight.x2 <== mulAny.out[0];
+ addRight.y2 <== mulAny.out[1];
+
+// Calculate left side of equation left = S*B8
+
+ var BASE8 = [
+ 17777552123799933955779906779655732241715742912184938656739573121738514868268,
+ 2626589144620713026669568689430873010625803728049924121243784502389097019475
+ ];
+ component mulFix = EscalarMulFix(253, BASE8);
+ for (i=0; i<253; i++) {
+ mulFix.e[i] <== snum2bits.out[i];
+ }
+
+// Do the comparation left == right if enabled;
+
+ component eqCheckX = ForceEqualIfEnabled();
+ eqCheckX.enabled <== enabled;
+ eqCheckX.in[0] <== mulFix.out[0];
+ eqCheckX.in[1] <== addRight.xout;
+
+ component eqCheckY = ForceEqualIfEnabled();
+ eqCheckY.enabled <== enabled;
+ eqCheckY.in[0] <== mulFix.out[1];
+ eqCheckY.in[1] <== addRight.yout;
+}
diff --git a/circuits/mimcsponge.circom b/circuits/mimcsponge.circom
new file mode 100644
index 0000000..de9bf1e
--- /dev/null
+++ b/circuits/mimcsponge.circom
@@ -0,0 +1,283 @@
+// implements MiMC-2n/n as hash using a sponge construction.
+// log_5(21888242871839275222246405745257275088548364400416034343698204186575808495617) ~= 110
+// => nRounds should be 220
+template MiMCSponge(nInputs, nRounds, nOutputs) {
+ signal input ins[nInputs];
+ signal input k;
+ signal output outs[nOutputs];
+
+ // S = R||C
+ component S[nInputs + nOutputs - 1];
+
+ for (var i = 0; i < nInputs; i++) {
+ S[i] = MiMCFeistel(nRounds);
+ S[i].k <== k;
+ if (i == 0) {
+ S[i].xL_in <== ins[0];
+ S[i].xR_in <== 0;
+ } else {
+ S[i].xL_in <== S[i-1].xL_out + ins[i];
+ S[i].xR_in <== S[i-1].xR_out;
+ }
+ }
+
+ outs[0] = S[nInputs - 1].xL_out;
+
+ for (var i = 0; i < nOutputs - 1; i++) {
+ S[nInputs + i] = MiMCFeistel(nRounds);
+ S[nInputs + i].k <== k;
+ S[nInputs + i].xL_in <== S[nInputs + i - 1].xL_out;
+ S[nInputs + i].xR_in <== S[nInputs + i - 1].xR_out;
+ outs[i + 1] <== S[nInputs + i].xL_out;
+ }
+}
+
+template MiMCFeistel(nrounds) {
+ signal input xL_in;
+ signal input xR_in;
+ signal input k;
+ signal output xL_out;
+ signal output xR_out;
+
+ var c = [
+ 0,
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+ 2119542016932434047340813757208803962484943912710204325088879681995922344971,
+ 0
+ ];
+
+ var t;
+ signal t2[nrounds];
+ signal t4[nrounds];
+ signal xL[nrounds-1];
+ signal xR[nrounds-1];
+
+ for (var i=0; i= babyJub.subOrder) return false;
+
+ const hm = mimcsponge.multiHash([sig.R8[0], sig.R8[1], A[0], A[1], msg]);
+
+ const Pleft = babyJub.mulPointEscalar(babyJub.Base8, sig.S);
+ let Pright = babyJub.mulPointEscalar(A, hm.mul(bigInt("8")));
+ Pright = babyJub.addPoint(sig.R8, Pright);
+
+ if (!Pleft[0].equals(Pright[0])) return false;
+ if (!Pleft[1].equals(Pright[1])) return false;
+ return true;
+}
+
function packSignature(sig) {
const R8p = babyJub.packPoint(sig.R8);
const Sp = bigInt.leInt2Buff(sig.S, 32);
diff --git a/src/mimc_printconstants..js b/src/mimc_printconstants.js
similarity index 100%
rename from src/mimc_printconstants..js
rename to src/mimc_printconstants.js
diff --git a/src/mimcsponge.js b/src/mimcsponge.js
new file mode 100644
index 0000000..73ce0c5
--- /dev/null
+++ b/src/mimcsponge.js
@@ -0,0 +1,86 @@
+const bn128 = require("snarkjs").bn128;
+const bigInt = require("snarkjs").bigInt;
+const Web3Utils = require("web3-utils");
+const F = bn128.Fr;
+
+const SEED = "mimcsponge";
+const NROUNDS = 220;
+
+exports.getIV = (seed) => {
+ if (typeof seed === "undefined") seed = SEED;
+ const c = Web3Utils.keccak256(seed+"_iv");
+ const cn = bigInt(Web3Utils.toBN(c).toString());
+ const iv = cn.mod(F.q);
+ return iv;
+};
+
+exports.getConstants = (seed, nRounds) => {
+ if (typeof seed === "undefined") seed = SEED;
+ if (typeof nRounds === "undefined") nRounds = NROUNDS;
+ const cts = new Array(nRounds);
+ let c = Web3Utils.keccak256(SEED);
+ for (let i=1; i{
+ let xL = bigInt(_xL_in);
+ let xR = bigInt(_xR_in);
+ const k = bigInt(_k);
+ for (let i=0; i {
+ if (typeof(numOutputs) === "undefined") {
+ numOutputs = 1;
+ }
+ if (typeof(key) === "undefined") {
+ key = F.zero;
+ }
+
+ let R = F.zero;
+ let C = F.zero;
+
+ for (let i=0; i F.affine(x));
+ }
+};
diff --git a/src/mimcsponge_gencontract.js b/src/mimcsponge_gencontract.js
new file mode 100644
index 0000000..eb7d27b
--- /dev/null
+++ b/src/mimcsponge_gencontract.js
@@ -0,0 +1,128 @@
+// Copyright (c) 2018 Jordi Baylina
+// License: LGPL-3.0+
+//
+
+const Web3Utils = require("web3-utils");
+
+const Contract = require("./evmasm");
+
+function createCode(seed, n) {
+
+ let ci = Web3Utils.keccak256(seed);
+
+ const C = new Contract();
+
+ C.push(0x64);
+ C.push("0x00");
+ C.push("0x00");
+ C.calldatacopy();
+ C.push("0x0100000000000000000000000000000000000000000000000000000000");
+ C.push("0x00");
+ C.mload();
+ C.div();
+ C.push("0x3f1a1187"); // MiMCSponge(uint256,uint256,uint256)
+ C.eq();
+ C.jmpi("start");
+ C.invalid();
+
+ C.label("start");
+ C.push("0x30644e72e131a029b85045b68181585d2833e84879b9709143e1f593f0000001"); // q
+ C.push("0x44");
+ C.mload(); // k q
+ C.push("0x04");
+ C.mload(); // xL k q
+ C.dup(2); // q xL k q
+ C.push("0x24");
+ C.mload(); // xR q xL k q
+ C.dup(1); // q xR q xL k q
+ C.dup(0); // q q xR q xL k q
+ C.dup(4); // xL q q xR q xL k q
+ C.dup(6); // k xL q q xR q xL k q
+ C.addmod(); // t=k+xL q xR q xL k q
+ C.dup(1); // q t q xR q xL k q
+ C.dup(0); // q q t q xR q xL k q
+ C.dup(2); // t q q t q xR q xL k q
+ C.dup(0); // t t q q t q xR q xL k q
+ C.mulmod(); // b=t^2 q t q xR q xL k q
+ C.dup(0); // b b q t q xR q xL k q
+ C.mulmod(); // c=t^4 t q xR q xL k q
+ C.mulmod(); // d=t^5 xR q xL k q
+ C.addmod(); // e=t^5+xR xL k q (for next round: xL xR k q)
+
+ for (let i=0; i {
+ const cirDef = await compiler(path.join(__dirname, "circuits", "mimc_sponge_test.circom"));
+
+ circuit = new snarkjs.Circuit(cirDef);
+
+ console.log("MiMC Feistel constraints: " + circuit.nConstraints);
+
+ const w = circuit.calculateWitness({xL_in: 1, xR_in: 2, k: 3});
+
+ const xLout = w[circuit.getSignalIdx("main.xL_out")];
+ const xRout = w[circuit.getSignalIdx("main.xR_out")];
+
+ const out2 = mimcjs.hash(1,2,3);
+
+ assert.equal(xLout.toString(), out2.xL.toString());
+ assert.equal(xRout.toString(), out2.xR.toString());
+
+ assert(circuit.checkWitness(w));
+
+ });
+
+ it("Should check hash", async () => {
+ const cirDef = await compiler(path.join(__dirname, "circuits", "mimc_sponge_hash_test.circom"));
+
+ circuit = new snarkjs.Circuit(cirDef);
+
+ console.log("MiMC Sponge constraints: " + circuit.nConstraints);
+
+ const w = circuit.calculateWitness({ins: [1, 2], k: 0});
+
+ const o1 = w[circuit.getSignalIdx("main.outs[0]")];
+ const o2 = w[circuit.getSignalIdx("main.outs[1]")];
+ const o3 = w[circuit.getSignalIdx("main.outs[2]")];
+
+ const out2 = mimcjs.multiHash([1,2], 0, 3);
+
+ assert.equal(o1.toString(), out2[0].toString());
+ assert.equal(o2.toString(), out2[1].toString());
+ assert.equal(o3.toString(), out2[2].toString());
+
+ assert(circuit.checkWitness(w));
+
+ });
+});
diff --git a/test/mimcspongecontract.js b/test/mimcspongecontract.js
new file mode 100644
index 0000000..a2e7394
--- /dev/null
+++ b/test/mimcspongecontract.js
@@ -0,0 +1,43 @@
+const ganache = require("ganache-cli");
+const Web3 = require("web3");
+const chai = require("chai");
+const mimcGenContract = require("../src/mimcsponge_gencontract.js");
+const mimcjs = require("../src/mimcsponge.js");
+
+
+const assert = chai.assert;
+const log = (msg) => { if (process.env.MOCHA_VERBOSE) console.log(msg); };
+
+const SEED = "mimcsponge";
+
+describe("MiMC Sponge Smart contract test", () => {
+ let testrpc;
+ let web3;
+ let mimc;
+ let accounts;
+
+ before(async () => {
+ web3 = new Web3(ganache.provider(), null, { transactionConfirmationBlocks: 1 });
+ accounts = await web3.eth.getAccounts();
+ });
+
+ it("Should deploy the contract", async () => {
+ const C = new web3.eth.Contract(mimcGenContract.abi);
+
+ mimc = await C.deploy({
+ data: mimcGenContract.createCode(SEED, 220)
+ }).send({
+ gas: 3500000,
+ from: accounts[0]
+ });
+ });
+
+ it("Shold calculate the mimc correctly", async () => {
+ const res = await mimc.methods.MiMCSponge(1,2,3).call();
+ const res2 = await mimcjs.hash(1,2,3);
+
+ assert.equal(res.xL.toString(), res2.xL.toString());
+ assert.equal(res.xR.toString(), res2.xR.toString());
+ });
+});
+