CyberChef/src/core/operations/FernetDecrypt.mjs

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/**
2019-03-03 17:19:07 +01:00
* @author Karsten Silkenbäumer [github.com/kassi]
* @copyright Karsten Silkenbäumer 2019
* @license Apache-2.0
*/
import Operation from "../Operation";
import OperationError from "../errors/OperationError";
import fernet from "fernet";
/**
* FernetDecrypt operation
*/
class FernetDecrypt extends Operation {
/**
* FernetDecrypt constructor
*/
constructor() {
super();
this.name = "Fernet Decrypt";
this.module = "Default";
this.description = "Fernet is a symmetric encryption method which makes sure that the message encrypted cannot be manipulated/read without the key. It uses URL safe encoding for the keys. Fernet uses 128-bit AES in CBC mode and PKCS7 padding, with HMAC using SHA256 for authentication. The IV is created from os.random().<br><br><b>Key:</b> The key must be 32 bytes (256 bits) encoded with Base64.";
this.infoURL = "https://asecuritysite.com/encryption/fer";
this.inputType = "string";
this.outputType = "string";
this.args = [
{
"name": "Key",
"type": "string",
"value": ""
},
];
this.patterns = [
{
match: "^[A-Z\\d\\-_=]{20,}$",
flags: "i",
args: []
},
];
}
/**
* @param {String} input
* @param {Object[]} args
* @returns {String}
*/
run(input, args) {
const [secretInput] = args;
try {
const secret = new fernet.Secret(secretInput);
const token = new fernet.Token({
secret: secret,
token: input,
ttl: 0
});
return token.decode();
} catch (err) {
throw new OperationError(err);
}
}
}
export default FernetDecrypt;