node-red-contrib-trng/trng.js

A Node-RED module for generating random data using a hybrid approach.

/**

 Copyright 2023 Bufferstack.IO Analytics Technology LLP, Pune

 Licensed under the GNU General Public License, Version 3.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

 https://www.gnu.org/licenses/gpl-3.0.html

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.

 **/

// Harshad Joshi, 2023
// Release data - 27 April 2023


const crypto = require("crypto");

const randomly = Math.random();

function createEntropyBuffer() {
  const timestamp = BigInt(new Date().getTime()) * BigInt(1000000);
  const processEntropy = BigInt(process.hrtime.bigint() + BigInt(process.pid));
  const mixedEntropy = timestamp ^ processEntropy;

  const processBuffer = Buffer.allocUnsafe(8);
  processBuffer.writeBigInt64BE(mixedEntropy);
  return processBuffer;
}

module.exports = function (RED) {
  function TRNGNode(config) {
    RED.nodes.createNode(this, config);
    var node = this;

    node.on("input", function (msg) {
      const length = msg.length || 8; // Default to 8 characters if no length is specified in the input message
      const randomMultiplier = randomly + Math.random(); // Random multiplier between 1 and 2
      const byteLength = Math.ceil(length / randomMultiplier);
      const cryptoBuffer = crypto.randomBytes(byteLength);

      const processBuffer = createEntropyBuffer();

      const hash = crypto.createHash('sha512',randomly);
      hash.update(cryptoBuffer);
      hash.update(processBuffer);
      const digestBuffer = hash.digest();

      msg.payload = digestBuffer.toString('hex').slice(0, length); // Convert buffer to a hexadecimal string and limit to the desired length
      node.send(msg);
    });
  }

  RED.nodes.registerType("trng", TRNGNode);
};