const { X509Certificate } = require('crypto') module.exports = function (certSrc, algorithm) { algorithm ??= '' if (!/^(\d+|sha\d+|)$/i.test(algorithm)) return null algorithm = String(algorithm).replace(/^sha-?/i,'') if (algorithm === '1') algorithm = '' let cert = new X509Certificate(certSrc) if (!cert) return null return cert['fingerprint'+algorithm]?.toLowerCase().replace(/:/g,'') }