mirror of
https://github.com/gchq/CyberChef.git
synced 2025-04-21 15:26:16 -04:00
6155634d3b
This adds an implementation of the SM4 block cipher, and operations to encrypt and decrypt using it with CBC,ECB,CFB,OFB,CTR modes. Also, a "no padding" option is added for AES,DES,3DES and SM4 decryption in ECB/CBC modes. This variant does not attempt to validate the last block as being PKCS#7 padded. This is useful, both since other padding schemes exist, and also for decrypting data where the final block is missing.
88 lines
2.6 KiB
JavaScript
88 lines
2.6 KiB
JavaScript
/**
|
|
* @author swesven
|
|
* @copyright 2021
|
|
* @license Apache-2.0
|
|
*/
|
|
|
|
import Operation from "../Operation.mjs";
|
|
import Utils from "../Utils.mjs";
|
|
import OperationError from "../errors/OperationError.mjs";
|
|
import { toHex } from "../lib/Hex.mjs";
|
|
import { decryptSM4 } from "../lib/SM4.mjs";
|
|
|
|
/**
|
|
* SM4 Decrypt operation
|
|
*/
|
|
class SM4Decrypt extends Operation {
|
|
|
|
/**
|
|
* SM4Encrypt constructor
|
|
*/
|
|
constructor() {
|
|
super();
|
|
|
|
this.name = "SM4 Decrypt";
|
|
this.module = "Ciphers";
|
|
this.description = "SM4 is a 128-bit block cipher, currently established as a national standard (GB/T 32907-2016) of China.";
|
|
this.infoURL = "https://en.wikipedia.org/wiki/SM4_(cipher)";
|
|
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"]
|
|
},
|
|
{
|
|
"name": "Input",
|
|
"type": "option",
|
|
"value": ["Raw", "Hex"]
|
|
},
|
|
{
|
|
"name": "Output",
|
|
"type": "option",
|
|
"value": ["Hex", "Raw"]
|
|
}
|
|
];
|
|
}
|
|
|
|
/**
|
|
* @param {string} input
|
|
* @param {Object[]} args
|
|
* @returns {string}
|
|
*/
|
|
run(input, args) {
|
|
const key = Utils.convertToByteArray(args[0].string, args[0].option),
|
|
iv = Utils.convertToByteArray(args[1].string, args[1].option),
|
|
[,, mode, inputType, outputType] = args;
|
|
|
|
if (key.length !== 16)
|
|
throw new OperationError(`Invalid key length: ${key.length} bytes
|
|
|
|
SM4 uses a key length of 16 bytes (128 bits).`);
|
|
if (iv.length !== 16 && !mode.startsWith("ECB"))
|
|
throw new OperationError(`Invalid IV length: ${iv.length} bytes
|
|
|
|
SM4 uses an IV length of 16 bytes (128 bits).
|
|
Make sure you have specified the type correctly (e.g. Hex vs UTF8).`);
|
|
|
|
input = Utils.convertToByteArray(input, inputType);
|
|
const output = decryptSM4(input, key, iv, mode.substring(0, 3), mode.endsWith("NoPadding"));
|
|
return outputType === "Hex" ? toHex(output) : Utils.byteArrayToUtf8(output);
|
|
}
|
|
|
|
}
|
|
|
|
export default SM4Decrypt;
|