discreetly-interfaces
Version:
Common interfaces and utilities for discreetly
172 lines (159 loc) • 15.2 kB
JavaScript
/**
* @module discreetly-interfaces
* @version 0.1.42
* @file Common interfaces and utilities for discreetly
* @copyright Privacy and Scaling Exploration 2023
* @license MIT
* @see [Github]{@link https://github.com/Discreetly}
*/
;
var bytes = require('@ethersproject/bytes');
var strings = require('@ethersproject/strings');
var keccak256 = require('@ethersproject/keccak256');
var poseidon2$1 = {};
const F = BigInt('21888242871839275222246405745257275088548364400416034343698204186575808495617');
// Parameters are generated by a reference script https://extgit.iaik.tugraz.at/krypto/hadeshash/-/blob/master/code/generate_parameters_grain.sage
// Used like so: sage generate_parameters_grain.sage 1 0 254 2 8 56 0x30644e72e131a029b85045b68181585d2833e84879b9709143e1f593f0000001
// Using recommended parameters from whitepaper https://eprint.iacr.org/2019/458.pdf (table 2, table 8)
// Generated by https://extgit.iaik.tugraz.at/krypto/hadeshash/-/blob/master/code/calc_round_numbers.py
// And rounded up to nearest integer that divides by t
const N_ROUNDS_F = 8;
const N_ROUNDS_P = [56, 57, 56, 60, 60, 63, 64, 63, 60, 66, 60, 65, 70, 60, 64, 68];
const pow5 = v => {
let o = v * v;
return v * o * o % F;
};
function mix(state, M) {
const out = [];
for (let x = 0; x < state.length; x++) {
let o = 0n;
for (let y = 0; y < state.length; y++) {
o = o + M[x][y] * state[y];
}
out.push(o % F);
}
return out;
}
function poseidon(_inputs, opt) {
const inputs = _inputs.map(i => BigInt(i));
if (inputs.length <= 0) {
throw new Error('poseidon-lite: Not enough inputs');
}
if (inputs.length > N_ROUNDS_P.length) {
throw new Error('poseidon-lite: Too many inputs');
}
const t = inputs.length + 1;
const nRoundsF = N_ROUNDS_F;
const nRoundsP = N_ROUNDS_P[t - 2];
const {
C,
M
} = opt;
if (M.length !== t) {
throw new Error(`poseidon-lite: Incorrect M length, expected ${t} got ${M.length}`);
}
let state = [0n, ...inputs];
for (let x = 0; x < nRoundsF + nRoundsP; x++) {
for (let y = 0; y < state.length; y++) {
state[y] = state[y] + C[x * t + y];
if (x < nRoundsF / 2 || x >= nRoundsF / 2 + nRoundsP) state[y] = pow5(state[y]);else if (y === 0) state[y] = pow5(state[y]);
}
state = mix(state, M);
}
return state[0];
}
var poseidon_1 = poseidon;
var unstringify = {};
Object.defineProperty(unstringify, "__esModule", {
value: true
});
unstringify.default = unstringifyBigInts;
function unstringifyBigInts(o) {
if (Array.isArray(o)) {
return o.map(unstringifyBigInts);
} else if (typeof o == 'object') {
const res = {};
for (const [key, val] of Object.entries(o)) {
res[key] = unstringifyBigInts(val);
}
return res;
}
// base64 decode
const byteArray = Uint8Array.from(atob(o), c => c.charCodeAt(0));
const hex = [...byteArray].map(x => x.toString(16).padStart(2, '0')).join('');
return BigInt(`0x${hex}`);
}
var _2 = {};
Object.defineProperty(_2, "__esModule", {
value: true
});
_2.default = void 0;
var _default = {
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};
_2.default = _default;
Object.defineProperty(poseidon2$1, "__esModule", {
value: true
});
var poseidon2_2 = poseidon2$1.poseidon2 = poseidon2;
var _poseidon = _interopRequireDefault(poseidon_1);
var _unstringify = _interopRequireDefault(unstringify);
var _ = _interopRequireDefault(_2);
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
const c = (0, _unstringify.default)(_.default);
function poseidon2(inputs) {
return (0, _poseidon.default)(inputs, c);
}
function str2BigInt(str) {
var num = '';
for (var i = 0; i < str.length; i++) {
num += str.charCodeAt(i).toString();
}
return BigInt(num);
}
/**
* @description Generates a room ID from a server ID and room name
* @param serverID : bigint | string | number
* @param roomName : bigint | string | number
* @returns roomId : bigint
*/
function genId(serverID, roomName) {
if (typeof roomName === 'string') {
return poseidon2_2([BigInt(serverID), str2BigInt(roomName)]);
}
return poseidon2_2([serverID, BigInt(roomName)]);
}
function randomBigInt(bits) {
if (bits === void 0) { bits = 253; }
var hexBits = bits / 4;
var hexString = '';
for (var i = 0; i < hexBits; i++) {
hexString += Math.floor(Math.random() * 16).toString(16);
}
return BigInt('0x' + hexString);
}
/**
* @description Hashes the identity commitment and user message limit into the rate commitment
* @param identityCommitment Semaphore Identity Commitment
* @param userMessageLimit Number of messages a user can send per RLN epoch
* @returns rlnRateCommitment
*/
function getRateCommitmentHash(identityCommitment, userMessageLimit) {
return poseidon2_2([identityCommitment, userMessageLimit]);
}
/**
* Hashes a signal string with Keccak256.
* @param signal The RLN signal.
* @returns The signal hash.
*/
function calculateSignalHash(signal) {
var converted = bytes.hexlify(strings.toUtf8Bytes(signal));
return BigInt(keccak256.keccak256(converted)) >> BigInt(8);
}
exports.calculateSignalHash = calculateSignalHash;
exports.genId = genId;
exports.getRateCommitmentHash = getRateCommitmentHash;
exports.randomBigInt = randomBigInt;
exports.str2BigInt = str2BigInt;
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