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js-motion-rng

v1.0.1

Published

Hash device motion data with chaos-based preprocessing

Downloads

188

Readme

js-motion-rng

[!NOTE] 思いつきをCodexで具現化したやつです。実用性については知りません。

[!WARNING] 使用しているAPIの都合上、一部デバイス・ブラウザ環境では動作しないことがあります。

ブラウザのDeviceMotionEventを使用した乱数生成ライブラリです。 普通の乱数で満足しない時に使ってください。

機能

  • DeviceMotionEvent からモーションデータを抽出
  • 数値フィールドにロジスティック写像ベースのカオス変換を適用
  • すべての値を SHA-256 でハッシュ化
  • null は固定トークン由来の安定ハッシュへ変換
  • 抽出した全ハッシュを統合し、単一の乱数(BigInt)を生成

インストール

npm install js-motion-rng

使い方

import { processMotionEventWithRandom } from "js-motion-rng";

window.addEventListener("devicemotion", async (event) => {
  const { randomNumber, randomNumberNormalized, hashedData } = await processMotionEventWithRandom(event);

  console.log(randomNumber.toString()); // BigInt
  console.log(randomNumberNormalized); // [0, 1) の number
  console.log(hashedData); // ハッシュ化済みデータ
});

API

processMotionEvent(event)

DeviceMotionEvent を入力として、以下を含むハッシュ化済みオブジェクトを返します。

  • timestamp
  • interval
  • acceleration
  • accelerationIncludingGravity
  • rotationRate

返却される各値は SHA-256 ハッシュ文字列です。

generateMotionRandomNumber(event)

モーションデータから生成した全ハッシュ(タイムスタンプ由来ハッシュを含む)を統合し、 単一の BigInt 乱数を返します。

generateMotionRandomNumberNormalized(event)

generateMotionRandomNumber の結果から導出した、[0, 1) 範囲の number を返します。

processMotionEventWithRandom(event)

1回の呼び出しで以下を返します。

  • hashedData
  • randomNumberBigInt
  • randomNumberNormalizednumber, [0, 1)

テスト

npm test

ブラウザ実行例

npm run example:serve

examples/browser/index.html をローカルサーバー経由で開き、 デバイスモーションの権限を許可して動作を確認してください。