CyberChef/src/core/operations/RSADecrypt.mjs

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2020-04-07 14:31:33 +02:00
/**
* @author Matt C [me@mitt.dev]
* @copyright Crown Copyright 2020
* @license Apache-2.0
*/
import Operation from "../Operation.mjs";
import OperationError from "../errors/OperationError.mjs";
import forge from "node-forge/dist/forge.min.js";
import { MD_ALGORITHMS } from "../lib/RSA.mjs";
/**
* RSA Decrypt operation
*/
class RSADecrypt extends Operation {
/**
* RSADecrypt constructor
*/
constructor() {
super();
this.name = "RSA Decrypt";
this.module = "Ciphers";
this.description = "Decrypt an RSA encrypted message with a PEM encoded private key.";
this.infoURL = "https://wikipedia.org/wiki/RSA_(cryptosystem)";
this.inputType = "string";
this.outputType = "string";
this.args = [
{
name: "RSA Private Key (PEM)",
type: "text",
value: "-----BEGIN RSA PRIVATE KEY-----"
},
{
name: "Key Password",
type: "text",
value: ""
},
{
name: "Encryption Scheme",
type: "argSelector",
value: [
{
name: "RSA-OAEP",
on: [3]
},
{
name: "RSAES-PKCS1-V1_5",
off: [3]
},
{
name: "RAW",
off: [3]
}]
},
{
name: "Message Digest Algorithm",
type: "option",
value: Object.keys(MD_ALGORITHMS)
}
];
}
/**
* @param {string} input
* @param {Object[]} args
* @returns {string}
*/
run(input, args) {
const [pemKey, password, scheme, md] = args;
if (pemKey.replace("-----BEGIN RSA PRIVATE KEY-----", "").length === 0) {
throw new OperationError("Please enter a private key.");
}
try {
const privKey = forge.pki.decryptRsaPrivateKey(pemKey, password);
const dMsg = privKey.decrypt(input, scheme, {md: MD_ALGORITHMS[md].create()});
return dMsg;
} catch (err) {
throw new OperationError(err);
}
}
}
export default RSADecrypt;