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Macide Celik 2019-10-27 22:16:02 +03:00 committed by GitHub
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src/core/operations/AESDecrypt.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 forge from "node-forge/dist/forge.min.js";
import OperationError from "../errors/OperationError.mjs";
/**
* AES Decrypt operation
*/
class AESDecrypt extends Operation {
/**
* AESDecrypt constructor
*/
constructor() {
super();
this.name = "AES Decrypt";
this.module = "Ciphers";
this.description = "Advanced Encryption Standard (AES) is a U.S. Federal Information Processing Standard (FIPS). It was selected after a 5-year process where 15 competing designs were evaluated.<br><br><b>Key:</b> The following algorithms will be used based on the size of the key:<ul><li>16 bytes = AES-128</li><li>24 bytes = AES-192</li><li>32 bytes = AES-256</li></ul><br><br><b>IV:</b> The Initialization Vector should be 16 bytes long. If not entered, it will default to 16 null bytes.<br><br><b>Padding:</b> In CBC and ECB mode, PKCS#7 padding will be used.<br><br><b>GCM Tag:</b> This field is ignored unless 'GCM' mode is used.";
this.infoURL = "https://wikipedia.org/wiki/Advanced_Encryption_Standard";
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", "GCM", "ECB"]
},
{
"name": "Input",
"type": "option",
"value": ["Hex", "Raw"]
},
{
"name": "Output",
"type": "option",
"value": ["Raw", "Hex"]
},
{
"name": "GCM Tag",
"type": "toggleString",
"value": "",
"toggleValues": ["Hex", "UTF8", "Latin1", "Base64"]
}
];
}
/**
* @param {string} input
* @param {Object[]} args
* @returns {string}
*
* @throws {OperationError} if cannot decrypt input or invalid key length
*/
run(input, args) {
const key = Utils.convertToByteString(args[0].string, args[0].option),
iv = Utils.convertToByteString(args[1].string, args[1].option),
mode = args[2],
inputType = args[3],
outputType = args[4],
gcmTag = Utils.convertToByteString(args[5].string, args[5].option);
if ([16, 24, 32].indexOf(key.length) < 0) {
throw new OperationError(`Invalid key length: ${key.length} bytes
The following algorithms will be used based on the size of the key:
16 bytes = AES-128
24 bytes = AES-192
32 bytes = AES-256`);
}
input = Utils.convertToByteString(input, inputType);
const decipher = forge.cipher.createDecipher("AES-" + mode, key);
decipher.start({
iv: iv.length === 0 ? "" : iv,
tag: gcmTag
});
decipher.update(forge.util.createBuffer(input));
const result = decipher.finish();
if (result) {
return outputType === "Hex" ? decipher.output.toHex() : decipher.output.getBytes();
} else {
throw new OperationError("Unable to decrypt input with these parameters.");
}
}
}
export default AESDecrypt;