mirror of https://github.com/gchq/CyberChef.git
103 lines
3.4 KiB
JavaScript
103 lines
3.4 KiB
JavaScript
/**
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* @author MikeCAT
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* @license Apache-2.0
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*/
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import Operation from "../Operation.mjs";
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import Utils from "../Utils.mjs";
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/**
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* ROT13 Brute Force operation.
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*/
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class ROT13BruteForce extends Operation {
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/**
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* ROT13BruteForce constructor
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*/
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constructor() {
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super();
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this.name = "ROT13 Brute Force";
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this.module = "Default";
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this.description = "Try all meaningful amounts for ROT13.<br><br>Optionally you can enter your known plaintext (crib) to filter the result.";
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this.infoURL = "https://wikipedia.org/wiki/ROT13";
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this.inputType = "byteArray";
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this.outputType = "string";
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this.args = [
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{
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name: "Rotate lower case chars",
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type: "boolean",
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value: true
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},
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{
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name: "Rotate upper case chars",
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type: "boolean",
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value: true
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},
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{
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name: "Rotate numbers",
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type: "boolean",
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value: false
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},
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{
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name: "Sample length",
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type: "number",
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value: 100
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},
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{
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name: "Sample offset",
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type: "number",
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value: 0
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},
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{
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name: "Print amount",
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type: "boolean",
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value: true
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},
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{
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name: "Crib (known plaintext string)",
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type: "string",
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value: ""
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}
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];
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}
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/**
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* @param {byteArray} 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 [rotateLower, rotateUpper, rotateNum, sampleLength, sampleOffset, printAmount, crib] = args;
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const sample = input.slice(sampleOffset, sampleOffset + sampleLength);
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const cribLower = crib.toLowerCase();
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const lowerStart = "a".charCodeAt(0), upperStart = "A".charCodeAt(0), numStart = "0".charCodeAt(0);
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const result = [];
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for (let amount = 1; amount < 26; amount++) {
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const rotated = sample.slice();
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for (let i = 0; i < rotated.length; i++) {
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if (rotateLower && lowerStart <= rotated[i] && rotated[i] < lowerStart + 26) {
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rotated[i] = (rotated[i] - lowerStart + amount) % 26 + lowerStart;
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} else if (rotateUpper && upperStart <= rotated[i] && rotated[i] < upperStart + 26) {
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rotated[i] = (rotated[i] - upperStart + amount) % 26 + upperStart;
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} else if (rotateNum && numStart <= rotated[i] && rotated[i] < numStart + 10) {
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rotated[i] = (rotated[i] - numStart + amount) % 10 + numStart;
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}
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}
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const rotatedString = Utils.byteArrayToUtf8(rotated);
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if (rotatedString.toLowerCase().indexOf(cribLower) >= 0) {
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const rotatedStringPrintable = Utils.printable(rotatedString, false);
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if (printAmount) {
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const amountStr = "Amount = " + (" " + amount).slice(-2) + ": ";
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result.push(amountStr + rotatedStringPrintable);
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} else {
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result.push(rotatedStringPrintable);
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}
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}
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}
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return result.join("\n");
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}
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}
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export default ROT13BruteForce;
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