CyberChef/src/core/operations/TripleDESDecrypt.mjs

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/**
* @author n1474335 [n1474335@gmail.com]
* @copyright Crown Copyright 2016
* @license Apache-2.0
*/
import Operation from "../Operation.mjs";
import Utils from "../Utils.mjs";
import OperationError from "../errors/OperationError.mjs";
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import forge from "node-forge";
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/**
* Triple DES Decrypt operation
*/
class TripleDESDecrypt extends Operation {
/**
* TripleDESDecrypt constructor
*/
constructor() {
super();
this.name = "Triple DES Decrypt";
this.module = "Ciphers";
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.";
this.infoURL = "https://wikipedia.org/wiki/Triple_DES";
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this.inputType = "string";
this.outputType = "string";
this.args = [
{
"name": "Key",
"type": "toggleString",
"value": "",
"toggleValues": ["Hex", "UTF8", "Latin1", "Base64"]
},
{
"name": "IV",
"type": "toggleString",
"value": "",
"toggleValues": ["Hex", "UTF8", "Latin1", "Base64"]
},
{
"name": "Mode",
"type": "option",
"value": ["CBC", "CFB", "OFB", "CTR", "ECB", "CBC/NoPadding", "ECB/NoPadding"]
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},
{
"name": "Input",
"type": "option",
"value": ["Hex", "Raw"]
},
{
"name": "Output",
"type": "option",
"value": ["Raw", "Hex"]
}
];
}
/**
* @param {string} input
* @param {Object[]} args
* @returns {string}
*/
run(input, args) {
const key = Utils.convertToByteString(args[0].string, args[0].option),
iv = Utils.convertToByteArray(args[1].string, args[1].option),
mode = args[2].substring(0, 3),
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inputType = args[3],
outputType = args[4];
if (key.length !== 24) {
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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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}
if (iv.length !== 8 && mode !== "ECB") {
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throw new OperationError(`Invalid IV length: ${iv.length} bytes
Triple DES uses an IV length of 8 bytes (64 bits).
Make sure you have specified the type correctly (e.g. Hex vs UTF8).`);
}
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input = Utils.convertToByteString(input, inputType);
const decipher = forge.cipher.createDecipher("3DES-" + mode, key);
/* Allow for a "no padding" mode */
if (args[2].endsWith("NoPadding")) {
decipher.mode.unpad = function(output, options) {
return true;
};
}
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decipher.start({iv: iv});
decipher.update(forge.util.createBuffer(input));
const result = decipher.finish();
if (result) {
return outputType === "Hex" ? decipher.output.toHex() : decipher.output.getBytes();
} else {
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throw new OperationError("Unable to decrypt input with these parameters.");
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}
}
}
export default TripleDESDecrypt;