mirror of https://github.com/gchq/CyberChef.git
81 lines
2.2 KiB
JavaScript
81 lines
2.2 KiB
JavaScript
/**
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* @author cplussharp
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* @copyright Crown Copyright 2021
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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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* PEM to JWK operation
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*/
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class PEMToJWK extends Operation {
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/**
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* PEMToJWK constructor
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*/
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constructor() {
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super();
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this.name = "JWK to PEM";
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this.module = "PublicKey";
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this.description = "Converts Keys in JSON Web Key format to PEM format (PKCS#8).";
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this.infoURL = "https://datatracker.ietf.org/doc/html/rfc7517";
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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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"pattern": "\"kty\":\\s*\"(EC|RSA)\"",
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"flags": "gm",
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"args": []
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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 inputJson = JSON.parse(input);
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let keys = [];
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if (Array.isArray(inputJson)) {
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// list of keys => transform all keys
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keys = inputJson;
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} else if (Array.isArray(inputJson.keys)) {
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// JSON Web Key Set => transform all keys
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keys = inputJson.keys;
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} else if (typeof inputJson === "object") {
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// single key
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keys.push(inputJson);
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} else {
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throw new OperationError("Input is not a JSON Web Key");
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}
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let output = "";
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for (let i=0; i<keys.length; i++) {
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const jwk = keys[i];
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if (typeof jwk.kty !== "string") {
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throw new OperationError("Invalid JWK format");
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} else if ("|RSA|EC|".indexOf(jwk.kty) === -1) {
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throw new OperationError(`Unsupported JWK key type '${inputJson.kty}'`);
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}
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const key = r.KEYUTIL.getKey(jwk);
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const pem = key.isPrivate ? r.KEYUTIL.getPEM(key, "PKCS8PRV") : r.KEYUTIL.getPEM(key);
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// PEM ends with '\n', so a new key always starts on a new line
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output += pem;
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}
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return output;
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}
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}
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export default PEMToJWK;
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