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Change bases and IV

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This commit is contained in:
Jordi Baylina
2018-12-16 08:05:20 +01:00
parent 6d6558370f
commit 37edfc1834
13 changed files with 154 additions and 298 deletions
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15
src/mimc7.js
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@@ -3,11 +3,20 @@ const bigInt = require("snarkjs").bigInt;
const Web3 = require("web3");
const F = bn128.Fr;
const SEED = "iden3_mimc";
const nRounds = 91;
const SEED = "mimc";
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 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 = Web3.utils.keccak256(SEED);
for (let i=1; i<nRounds; i++) {
@@ -27,7 +36,7 @@ exports.hash = (_x_in, _k) =>{
const x_in = bigInt(_x_in);
const k = bigInt(_k);
let r;
for (let i=0; i<nRounds; i++) {
for (let i=0; i<NROUNDS; i++) {
const c = cts[i];
const t = (i==0) ? F.add(x_in, k) : F.add(F.add(r, k), c);
r = F.exp(t, 7);

3
src/mimc_print_iv.js Normal file
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@@ -0,0 +1,3 @@
const mimc7 = require("./mimc7.js");
console.log("IV: "+mimc7.getIV().toString());

13
src/mimc_printconstants..js Normal file
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@@ -0,0 +1,13 @@
const mimc7 = require("./mimc7.js");
const nRounds = 91;
let S = "[\n";
const cts = mimc7.getConstants();
for (let i=0; i<nRounds; i++) {
S = S + cts[i].toString();
if (i<nRounds-1) S = S + ",";
S=S+"\n";
}
S = S + "]\n";
console.log(S);

3
src/mimc_printconstants.js → src/mimc_printcontract.js
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@@ -1,6 +1,6 @@
const mimcGenContract = require("./mimc_gencontract");
const SEED = "iden3_mimc";
const SEED = "mimc";
let nRounds;
if (typeof process.argv[2] != "undefined") {
@@ -10,3 +10,4 @@ if (typeof process.argv[2] != "undefined") {
}
console.log(mimcGenContract.createCode(SEED, nRounds));

2
src/pedersenHash.js
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@@ -4,7 +4,7 @@ const babyJub = require("./babyjub");
const assert = require("assert");
const createBlakeHash = require("blake-hash");
const GENPOINT_PREFIX = "Iden3_PedersenGenerator";
const GENPOINT_PREFIX = "PedersenGenerator";
const windowSize = 4;
const nWindowsPerSegment = 50;

6
src/smt.js
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@@ -1,12 +1,12 @@
const bigInt = require("snarkjs").bigInt;
const SMTMemDB = require("./smt_memdb");
const mimc7 = require("./mimc7").hash;
const mimc7 = require("./mimc7");
function smtHash(arr) {
let r = bigInt(0);
let r = mimc7.getIV();
for (let i=0; i<arr.length; i++) {
r = mimc7(r, bigInt(arr[i]));
r = mimc7.hash(r, bigInt(arr[i]));
}
return r;
}