Calculate domain fingerprints

calculate-sha1-sha256.js

"use strict";
const openssl = require('openssl-nodejs');
const crypto = require('crypto');

function handler(domain)
{
  return openssl(['s_client', '-connect', domain, '-showcerts'], function (err, buffer) {

    const res = getCertificateFingerprintSha256(buffer.toString());
    console.log("sha - 256", res);

    const res2 = getCertificateFingerprintSha1(buffer.toString());
    console.log("sha - 1", res2);
  });
};

function getCertificateFingerprintSha256(certString) {
const baseString = certString.match(/-----BEGIN CERTIFICATE-----\s*([\s\S]+?)\s*-----END CERTIFICATE-----/i);
const rawCert = Buffer.from(baseString[1], "base64");
const sha256sum = crypto.createHash("sha256").update(rawCert).digest("hex");
return sha256sum.toUpperCase().replace(/(.{2})(?!$)/g, "$1:");
}

function getCertificateFingerprintSha1(certString) {
  const baseString = certString.match(/-----BEGIN CERTIFICATE-----\s*([\s\S]+?)\s*-----END CERTIFICATE-----/i);
  const rawCert = Buffer.from(baseString[1], "base64");
  const sha1sum = crypto.createHash("sha1").update(rawCert).digest("hex");
  return sha1sum.toUpperCase().replace(/(.{2})(?!$)/g, "$1:");
}

handler("saltukalakus.auth0.com:443");