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PEMtoHex: Support arbitrary PEMs

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previous implementation only supported some PEMs (e.g. Certificate)

the new implementation is more general,
it just extracts the base64 between
header and footer and decodes that to hex
This commit is contained in:
CPlusSharp 2021-11-07 11:21:17 +01:00
parent ae1b12c120
commit 1dbcd2ac84
3 changed files with 317 additions and 11 deletions
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33
src/core/operations/PEMToHex.mjs
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@ -1,11 +1,14 @@
/**
* @author n1474335 [n1474335@gmail.com]
* @author cplussharp
* @copyright Crown Copyright 2016
* @license Apache-2.0
*/
import r from "jsrsasign";
import {fromBase64} from "../lib/Base64.mjs";
import Operation from "../Operation.mjs";
import OperationError from "../errors/OperationError.mjs";
import Utils from "../Utils.mjs";
/**
* PEM to Hex operation
@ -33,17 +36,25 @@ class PEMToHex extends Operation {
* @returns {string}
*/
run(input, args) {
if (input.indexOf("-----BEGIN") < 0) {
// Add header so that the KEYUTIL function works
input = "-----BEGIN CERTIFICATE-----" + input;
let output = "";
let match;
const regex = /-----BEGIN ([A-Z][A-Z ]+[A-Z])-----/g;
while ((match = regex.exec(input)) !== null) {
// find corresponding end tag
const indexBase64 = match.index + match[0].length;
const footer = `-----END ${match[1]}-----`;
const indexFooter = input.indexOf(footer, indexBase64);
if (indexFooter === -1) {
throw new OperationError(`PEM footer '${footer}' not found`);
}
// decode base64 content
const base64 = input.substring(indexBase64, indexFooter);
const bytes = fromBase64(base64, "A-Za-z0-9+/=", "byteArray", true);
const hex = bytes.map(b => Utils.hex(b)).join("");
output += hex;
}
if (input.indexOf("-----END") < 0) {
// Add footer so that the KEYUTIL function works
input = input + "-----END CERTIFICATE-----";
}
const cert = new r.X509();
cert.readCertPEM(input);
return cert.hex;
return output;
}
}