mirror of https://github.com/gchq/CyberChef.git
96 lines
2.6 KiB
JavaScript
96 lines
2.6 KiB
JavaScript
/**
|
|
* @author n1474335 [n1474335@gmail.com]
|
|
* @copyright Crown Copyright 2016
|
|
* @license Apache-2.0
|
|
*/
|
|
|
|
import Operation from "../Operation.mjs";
|
|
import { format } from "../lib/Ciphers.mjs";
|
|
import CryptoJS from "crypto-js";
|
|
|
|
/**
|
|
* RC4 Drop operation
|
|
*/
|
|
class RC4Drop extends Operation {
|
|
|
|
/**
|
|
* RC4Drop constructor
|
|
*/
|
|
constructor() {
|
|
super();
|
|
|
|
this.name = "RC4 Drop";
|
|
this.module = "Ciphers";
|
|
this.description = "It was discovered that the first few bytes of the RC4 keystream are strongly non-random and leak information about the key. We can defend against this attack by discarding the initial portion of the keystream. This modified algorithm is traditionally called RC4-drop.";
|
|
this.infoURL = "https://wikipedia.org/wiki/RC4#Fluhrer,_Mantin_and_Shamir_attack";
|
|
this.inputType = "string";
|
|
this.outputType = "string";
|
|
this.args = [
|
|
{
|
|
"name": "Passphrase",
|
|
"type": "toggleString",
|
|
"value": "",
|
|
"toggleValues": ["UTF8", "UTF16", "UTF16LE", "UTF16BE", "Latin1", "Hex", "Base64"]
|
|
},
|
|
{
|
|
"name": "Input format",
|
|
"type": "option",
|
|
"value": ["Latin1", "UTF8", "UTF16", "UTF16LE", "UTF16BE", "Hex", "Base64"]
|
|
},
|
|
{
|
|
"name": "Output format",
|
|
"type": "option",
|
|
"value": ["Latin1", "UTF8", "UTF16", "UTF16LE", "UTF16BE", "Hex", "Base64"]
|
|
},
|
|
{
|
|
"name": "Number of dwords to drop",
|
|
"type": "number",
|
|
"value": 192
|
|
}
|
|
];
|
|
}
|
|
|
|
/**
|
|
* @param {string} input
|
|
* @param {Object[]} args
|
|
* @returns {string}
|
|
*/
|
|
run(input, args) {
|
|
const message = format[args[1]].parse(input),
|
|
passphrase = format[args[0].option].parse(args[0].string),
|
|
drop = args[3],
|
|
encrypted = CryptoJS.RC4Drop.encrypt(message, passphrase, { drop: drop });
|
|
|
|
return encrypted.ciphertext.toString(format[args[2]]);
|
|
}
|
|
|
|
/**
|
|
* Highlight RC4 Drop
|
|
*
|
|
* @param {Object[]} pos
|
|
* @param {number} pos[].start
|
|
* @param {number} pos[].end
|
|
* @param {Object[]} args
|
|
* @returns {Object[]} pos
|
|
*/
|
|
highlight(pos, args) {
|
|
return pos;
|
|
}
|
|
|
|
/**
|
|
* Highlight RC4 Drop 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 RC4Drop;
|