diff --git a/lib/cert-info.js b/lib/cert-info.js
deleted file mode 100644
index fb90195..0000000
--- a/lib/cert-info.js
+++ /dev/null
@@ -1,100 +0,0 @@
-'use strict';
-
-var certInfo = module.exports;
-
-// this is really memory expensive to do
-// (about half of a megabyte of loaded code)
-certInfo._pemToBinAb  = function (pem) {
-  var b64 = pem.replace(/(-----(BEGIN|END) CERTIFICATE-----|[\n\r])/g, '');
-  var buf = Buffer(b64, 'base64');
-  var ab = new Uint8Array(buf).buffer;          // WORKS
-  //var ab = buf.buffer                         // Doesn't work
-
-  return ab;
-};
-certInfo.getCertInfo = function (pem) {
-  var ab = module.exports._pemToBinAb(pem);
-  var merge = require("node.extend");
-
-  var common = require("asn1js/org/pkijs/common");
-  var _asn1js = require("asn1js");
-  var _pkijs = require("pkijs");
-  var _x509schema = require("pkijs/org/pkijs/x509_schema");
-
-  // #region Merging function/object declarations for ASN1js and PKIjs
-  var asn1js = merge(true, _asn1js, common);
-
-  var x509schema = merge(true, _x509schema, asn1js);
-
-  var pkijs_1 = merge(true, _pkijs, asn1js);
-  var pkijs = merge(true, pkijs_1, x509schema);
-
-  var asn1 = pkijs.org.pkijs.fromBER(ab);
-  var certSimpl = new pkijs.org.pkijs.simpl.CERT({ schema: asn1.result });
-
-  return certSimpl;
-};
-
-certInfo.getBasicInfo = function (pem) {
-  var c = certInfo.getCertInfo(pem);
-  var domains = [];
-  var sub;
-
-  c.extensions.forEach(function (ext) {
-    if (ext.parsedValue && ext.parsedValue.altNames) {
-      ext.parsedValue.altNames.forEach(function (alt) {
-        domains.push(alt.Name);
-      });
-    }
-  });
-
-  sub = c.subject.types_and_values[0].value.value_block.value || null;
-
-  return {
-    subject: sub
-  , altnames: domains
-    // for debugging during console.log
-    // do not expect these values to be here
-  , _issuedAt: c.notBefore.value
-  , _expiresAt: c.notAfter.value
-  , issuedAt: new Date(c.notBefore.value).valueOf()
-  , expiresAt: new Date(c.notAfter.value).valueOf()
-  };
-};
-
-certInfo.getCertInfoFromFile = function (pemFile) {
-  return require('fs').readFileSync(pemFile, 'ascii');
-};
-
-certInfo.testGetCertInfo = function (pathname) {
-  var path = require('path');
-  var pemFile = pathname || path.join(__dirname, '..', 'tests', 'example.cert.pem');
-  return certInfo.getCertInfo(certInfo.getCertInfoFromFile(pemFile));
-};
-
-certInfo.testBasicCertInfo = function (pathname) {
-  var path = require('path');
-  var pemFile = pathname || path.join(__dirname, '..', 'tests', 'example.cert.pem');
-  return certInfo.getBasicInfo(certInfo.getCertInfoFromFile(pemFile));
-};
-
-if (require.main === module) {
-  var c = certInfo.testGetCertInfo(process.argv[2]);
-
-  console.info('');
-
-  console.info(c.notBefore.value);
-  console.info(new Date(c.notBefore.value).valueOf());
-
-  console.info('');
-
-  console.info(c.notAfter.value);
-  console.info(new Date(c.notAfter.value).valueOf());
-
-  console.info('');
-
-  var b = certInfo.testBasicCertInfo(process.argv[2]);
-  console.info('');
-  console.info(JSON.stringify(b, null, '  '));
-  console.info('');
-}
diff --git a/lib/utils.js b/lib/utils.js
index bf183ee..78b8d49 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -8,8 +8,8 @@ var PromiseA = require('bluebird');
 var dns = PromiseA.promisifyAll(require('dns'));
 
 module.exports.attachCertInfo = function (results) {
-  var getCertInfo = require('./cert-info').getBasicInfo;
   // XXX Note: Parsing the certificate info comes at a great cost (~500kb)
+  var getCertInfo = require('certpem').info;
   var certInfo = getCertInfo(results.cert);
 
   // subject, altnames, issuedAt, expiresAt
diff --git a/package.json b/package.json
index 06a66db..e83b3ee 100644
--- a/package.json
+++ b/package.json
@@ -34,6 +34,7 @@
   "dependencies": {
     "asn1js": "^1.2.12",
     "bluebird": "^3.0.6",
+    "certpem": "^1.0.0",
     "homedir": "^0.6.0",
     "le-acme-core": "^2.0.5",
     "le-challenge-fs": "^2.0.2",