mirror of https://github.com/gchq/CyberChef.git
112 lines
3.6 KiB
JavaScript
112 lines
3.6 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.mjs";
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import Utils from "../Utils.mjs";
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import OperationError from "../errors/OperationError.mjs";
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import forge from "node-forge";
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/**
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* Triple DES Decrypt operation
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*/
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class TripleDESDecrypt extends Operation {
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/**
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* TripleDESDecrypt constructor
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*/
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constructor() {
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super();
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this.name = "Triple DES Decrypt";
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this.module = "Ciphers";
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this.description = "Triple DES applies DES three times to each block to increase key size.<br><br><b>Key:</b> Triple DES uses a key length of 24 bytes (192 bits).<br>DES uses a key length of 8 bytes (64 bits).<br><br><b>IV:</b> The Initialization Vector should be 8 bytes long. If not entered, it will default to 8 null bytes.<br><br><b>Padding:</b> In CBC and ECB mode, PKCS#7 padding will be used as a default.";
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this.infoURL = "https://wikipedia.org/wiki/Triple_DES";
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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": "Key",
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"type": "toggleString",
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"value": "",
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"toggleValues": ["Hex", "UTF8", "Latin1", "Base64"]
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},
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{
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"name": "IV",
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"type": "toggleString",
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"value": "",
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"toggleValues": ["Hex", "UTF8", "Latin1", "Base64"]
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},
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{
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"name": "Mode",
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"type": "option",
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"value": ["CBC", "CFB", "OFB", "CTR", "ECB", "CBC/NoPadding", "ECB/NoPadding"]
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},
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{
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"name": "Input",
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"type": "option",
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"value": ["Hex", "Raw"]
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},
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{
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"name": "Output",
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"type": "option",
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"value": ["Raw", "Hex"]
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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 key = Utils.convertToByteString(args[0].string, args[0].option),
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iv = Utils.convertToByteArray(args[1].string, args[1].option),
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mode = args[2].substring(0, 3),
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noPadding = args[2].endsWith("NoPadding"),
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inputType = args[3],
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outputType = args[4];
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if (key.length !== 24 && key.length !== 16) {
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throw new OperationError(`Invalid key length: ${key.length} bytes
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Triple DES uses a key length of 24 bytes (192 bits).
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DES uses a key length of 8 bytes (64 bits).`);
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}
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if (iv.length !== 8 && mode !== "ECB") {
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throw new OperationError(`Invalid IV length: ${iv.length} bytes
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Triple DES uses an IV length of 8 bytes (64 bits).
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Make sure you have specified the type correctly (e.g. Hex vs UTF8).`);
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}
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input = Utils.convertToByteString(input, inputType);
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const decipher = forge.cipher.createDecipher("3DES-" + mode,
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key.length === 16 ? key + key.substring(0, 8) : key);
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/* Allow for a "no padding" mode */
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if (noPadding) {
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decipher.mode.unpad = function(output, options) {
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return true;
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};
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}
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decipher.start({iv: iv});
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decipher.update(forge.util.createBuffer(input));
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const result = decipher.finish();
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if (result) {
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return outputType === "Hex" ? decipher.output.toHex() : decipher.output.getBytes();
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} else {
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throw new OperationError("Unable to decrypt input with these parameters.");
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}
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}
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}
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export default TripleDESDecrypt;
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