cyberchef
Version:
The Cyber Swiss Army Knife for encryption, encoding, compression and data analysis.
90 lines (79 loc) • 2.59 kB
JavaScript
/**
* @author n1474335 [n1474335@gmail.com]
* @copyright Crown Copyright 2016
* @license Apache-2.0
*/
import Operation from "../Operation.mjs";
import Utils from "../Utils.mjs";
import { bitOp, xor, BITWISE_OP_DELIMS } from "../lib/BitwiseOp.mjs";
/**
* XOR operation
*/
class XOR extends Operation {
/**
* XOR constructor
*/
constructor() {
super();
this.name = "XOR";
this.module = "Default";
this.description = "XOR the input with the given key.<br>e.g. <code>fe023da5</code><br><br><strong>Options</strong><br><u>Null preserving:</u> If the current byte is 0x00 or the same as the key, skip it.<br><br><u>Scheme:</u><ul><li>Standard - key is unchanged after each round</li><li>Input differential - key is set to the value of the previous unprocessed byte</li><li>Output differential - key is set to the value of the previous processed byte</li><li>Cascade - key is set to the input byte shifted by one</li></ul>";
this.infoURL = "https://wikipedia.org/wiki/XOR";
this.inputType = "ArrayBuffer";
this.outputType = "byteArray";
this.args = [
{
"name": "Key",
"type": "toggleString",
"value": "",
"toggleValues": BITWISE_OP_DELIMS
},
{
"name": "Scheme",
"type": "option",
"value": ["Standard", "Input differential", "Output differential", "Cascade"]
},
{
"name": "Null preserving",
"type": "boolean",
"value": false
}
];
}
/**
* @param {ArrayBuffer} input
* @param {Object[]} args
* @returns {byteArray}
*/
run(input, args) {
input = new Uint8Array(input);
const key = Utils.convertToByteArray(args[0].string || "", args[0].option),
[, scheme, nullPreserving] = args;
return bitOp(input, key, xor, nullPreserving, scheme);
}
/**
* Highlight XOR
*
* @param {Object[]} pos
* @param {number} pos[].start
* @param {number} pos[].end
* @param {Object[]} args
* @returns {Object[]} pos
*/
highlight(pos, args) {
return pos;
}
/**
* Highlight XOR 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 XOR;