mirror of https://github.com/gchq/CyberChef.git
90 lines
2.6 KiB
JavaScript
90 lines
2.6 KiB
JavaScript
/**
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* @author Matt C [me@mitt.dev]
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* @copyright Crown Copyright 2020
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* @license Apache-2.0
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*/
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import Operation from "../Operation.mjs";
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import OperationError from "../errors/OperationError.mjs";
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import forge from "node-forge";
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import { MD_ALGORITHMS } from "../lib/RSA.mjs";
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/**
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* RSA Encrypt operation
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*/
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class RSAEncrypt extends Operation {
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/**
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* RSAEncrypt constructor
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*/
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constructor() {
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super();
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this.name = "RSA Encrypt";
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this.module = "Ciphers";
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this.description = "Encrypt a message with a PEM encoded RSA public key.";
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this.infoURL = "https://wikipedia.org/wiki/RSA_(cryptosystem)";
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this.inputType = "string";
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this.outputType = "string";
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this.args = [
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{
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name: "RSA Public Key (PEM)",
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type: "text",
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value: "-----BEGIN RSA PUBLIC KEY-----"
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},
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{
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name: "Encryption Scheme",
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type: "argSelector",
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value: [
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{
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name: "RSA-OAEP",
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on: [2]
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},
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{
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name: "RSAES-PKCS1-V1_5",
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off: [2]
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},
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{
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name: "RAW",
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off: [2]
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}]
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},
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{
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name: "Message Digest Algorithm",
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type: "option",
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value: Object.keys(MD_ALGORITHMS)
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}
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];
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}
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/**
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* @param {string} input
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* @param {Object[]} args
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* @returns {string}
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*/
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run(input, args) {
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const [pemKey, scheme, md] = args;
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if (pemKey.replace("-----BEGIN RSA PUBLIC KEY-----", "").length === 0) {
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throw new OperationError("Please enter a public key.");
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}
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try {
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// Load public key
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const pubKey = forge.pki.publicKeyFromPem(pemKey);
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// https://github.com/digitalbazaar/forge/issues/465#issuecomment-271097600
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const plaintextBytes = forge.util.encodeUtf8(input);
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// Encrypt message
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const eMsg = pubKey.encrypt(plaintextBytes, scheme, {md: MD_ALGORITHMS[md].create()});
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return eMsg;
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} catch (err) {
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if (err.message === "RSAES-OAEP input message length is too long.") {
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throw new OperationError(`RSAES-OAEP input message length (${err.length}) is longer than the maximum allowed length (${err.maxLength}).`);
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}
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throw new OperationError(err);
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}
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}
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}
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export default RSAEncrypt;
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