mirror of https://github.com/gchq/CyberChef.git
83 lines
2.7 KiB
JavaScript
83 lines
2.7 KiB
JavaScript
/**
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* @author cplussharp
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* @copyright Crown Copyright 2023
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* @license Apache-2.0
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*/
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import r from "jsrsasign";
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import Operation from "../Operation.mjs";
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import OperationError from "../errors/OperationError.mjs";
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/**
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* Public Key from Private Key operation
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*/
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class PubKeyFromPrivKey extends Operation {
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/**
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* PubKeyFromPrivKey constructor
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*/
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constructor() {
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super();
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this.name = "Public Key from Private Key";
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this.module = "PublicKey";
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this.description = "Extracts the Public Key from a Private Key.";
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this.infoURL = "https://en.wikipedia.org/wiki/PKCS_8";
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this.inputType = "string";
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this.outputType = "string";
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this.args = [];
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this.checks = [];
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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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let output = "";
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let match;
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const regex = /-----BEGIN ((RSA |EC |DSA )?PRIVATE KEY)-----/g;
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while ((match = regex.exec(input)) !== null) {
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// find corresponding end tag
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const indexBase64 = match.index + match[0].length;
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const footer = `-----END ${match[1]}-----`;
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const indexFooter = input.indexOf(footer, indexBase64);
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if (indexFooter === -1) {
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throw new OperationError(`PEM footer '${footer}' not found`);
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}
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const privKeyPem = input.substring(match.index, indexFooter + footer.length);
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let privKey;
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try {
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privKey = r.KEYUTIL.getKey(privKeyPem);
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} catch (err) {
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throw new OperationError(`Unsupported key type: ${err}`);
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}
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let pubKey;
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if (privKey.type && privKey.type === "EC") {
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pubKey = new r.KJUR.crypto.ECDSA({ curve: privKey.curve });
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pubKey.setPublicKeyHex(privKey.generatePublicKeyHex());
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} else if (privKey.type && privKey.type === "DSA") {
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if (!privKey.y) {
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throw new OperationError(`DSA Private Key in PKCS#8 is not supported`);
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}
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pubKey = new r.KJUR.crypto.DSA();
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pubKey.setPublic(privKey.p, privKey.q, privKey.g, privKey.y);
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} else if (privKey.n && privKey.e) {
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pubKey = new r.RSAKey();
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pubKey.setPublic(privKey.n, privKey.e);
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} else {
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throw new OperationError(`Unsupported key type`);
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}
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const pubKeyPem = r.KEYUTIL.getPEM(pubKey);
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// PEM ends with '\n', so a new key always starts on a new line
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output += pubKeyPem;
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}
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return output;
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}
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}
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export default PubKeyFromPrivKey;
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