CyberChef/src/core/operations/ROT13.mjs

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/**
* @author n1474335 [n1474335@gmail.com]
* @copyright Crown Copyright 2016
* @license Apache-2.0
*/
import Operation from "../Operation.mjs";
/**
* ROT13 operation.
*/
class ROT13 extends Operation {
/**
* ROT13 constructor
*/
constructor() {
super();
this.name = "ROT13";
this.module = "Default";
this.description = "A simple caesar substitution cipher which rotates alphabet characters by the specified amount (default 13).";
this.infoURL = "https://wikipedia.org/wiki/ROT13";
this.inputType = "byteArray";
this.outputType = "byteArray";
this.args = [
{
name: "Rotate lower case chars",
type: "boolean",
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value: true
},
{
name: "Rotate upper case chars",
type: "boolean",
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value: true
},
{
name: "Amount",
type: "number",
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value: 13
},
];
}
/**
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* @param {byteArray} input
* @param {Object[]} args
* @returns {byteArray}
*/
run(input, args) {
const output = input,
rot13Lowercase = args[0],
rot13Upperacse = args[1];
let amount = args[2],
chr;
if (amount) {
if (amount < 0) {
amount = 26 - (Math.abs(amount) % 26);
}
for (let i = 0; i < input.length; i++) {
chr = input[i];
if (rot13Upperacse && chr >= 65 && chr <= 90) { // Upper case
chr = (chr - 65 + amount) % 26;
output[i] = chr + 65;
} else if (rot13Lowercase && chr >= 97 && chr <= 122) { // Lower case
chr = (chr - 97 + amount) % 26;
output[i] = chr + 97;
}
}
}
return output;
}
/**
* Highlight ROT13
*
* @param {Object[]} pos
* @param {number} pos[].start
* @param {number} pos[].end
* @param {Object[]} args
* @returns {Object[]} pos
*/
highlight(pos, args) {
return pos;
}
/**
* Highlight ROT13 in reverse
*
* @param {Object[]} pos
* @param {number} pos[].start
* @param {number} pos[].end
* @param {Object[]} args
* @returns {Object[]} pos
*/
highlightReverse(pos, args) {
return pos;
}
}
export default ROT13;