mirror of https://github.com/gchq/CyberChef.git
83 lines
2.4 KiB
JavaScript
83 lines
2.4 KiB
JavaScript
/**
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* @author n1474335 [n1474335@gmail.com]
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* @copyright Crown Copyright 2016
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* @license Apache-2.0
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*/
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import Operation from "../Operation";
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import Utils from "../Utils";
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import forge from "node-forge/dist/forge.min.js";
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import BigNumber from "bignumber.js";
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import { isWorkerEnvironment } from "../Utils";
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/**
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* Pseudo-Random Number Generator operation
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*/
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class PseudoRandomNumberGenerator extends Operation {
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/**
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* PseudoRandomNumberGenerator constructor
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*/
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constructor() {
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super();
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this.name = "Pseudo-Random Number Generator";
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this.module = "Ciphers";
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this.description = "A cryptographically-secure pseudo-random number generator (PRNG).<br><br>This operation uses the browser's built-in <code>crypto.getRandomValues()</code> method if available. If this cannot be found, it falls back to a Fortuna-based PRNG algorithm.";
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this.infoURL = "https://wikipedia.org/wiki/Pseudorandom_number_generator";
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this.inputType = "string";
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this.outputType = "string";
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this.args = [
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{
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"name": "Number of bytes",
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"type": "number",
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"value": 32
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},
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{
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"name": "Output as",
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"type": "option",
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"value": ["Hex", "Integer", "Byte array", "Raw"]
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}
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];
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}
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/**
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* @param {string} input
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* @param {Object[]} args
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* @returns {string}
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*/
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run(input, args) {
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const [numBytes, outputAs] = args;
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let bytes;
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if (isWorkerEnvironment() && self.crypto) {
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bytes = self.crypto.getRandomValues(new Uint8Array(numBytes));
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bytes = Utils.arrayBufferToStr(bytes.buffer);
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} else {
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bytes = forge.random.getBytesSync(numBytes);
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}
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let value = new BigNumber(0),
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i;
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switch (outputAs) {
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case "Hex":
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return forge.util.bytesToHex(bytes);
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case "Integer":
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for (i = bytes.length - 1; i >= 0; i--) {
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value = value.times(256).plus(bytes.charCodeAt(i));
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}
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return value.toFixed();
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case "Byte array":
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return JSON.stringify(Utils.strToCharcode(bytes));
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case "Raw":
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default:
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return bytes;
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}
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}
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}
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export default PseudoRandomNumberGenerator;
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