diff --git a/LICENSE.md b/LICENSE.md
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--- /dev/null
+++ b/LICENSE.md
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+The MIT License (MIT)
+=====================
+
+Copyright © 2016 Yury Popov
+
+Permission is hereby granted, free of charge, to any person
+obtaining a copy of this software and associated documentation
+files (the “Software”), to deal in the Software without
+restriction, including without limitation the rights to use,
+copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
diff --git a/README.md b/README.md
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+# Certificate common names extract library
+
+[![NPM version](https://badge.fury.io/js/certnames.svg)](https://www.npmjs.com/package/certnames)
+[![js-standard-style](https://img.shields.io/badge/code%20style-standard-brightgreen.svg)](http://standardjs.com/)
+
+This module provides API to get SSL certificate common names list.
+
+## Usage
+
+```javascript
+const certnames = require('certnames')
+const tls = require('tls')
+
+const host = 'comodo.com'
+const sock = tls.connect(443, host)
+
+sock.on('secureConnect', () => {
+  const cert = sock.getPeerCertificate().raw
+  const names = certnames.getCommonNames(cert)
+  console.log('Common names: %j', names)
+  // Common names: ["ssl383141.cloudflaressl.com","*.comodo.com","comodo.com"]
+  const regex = certnames.toRegEx(names)
+  console.log('Regex: %s', regex)
+  // Regex: /^((ssl383141\.cloudflaressl\.com)|(([^\.]+\.)?(comodo\.com)))$/gm
+})
+```
+
+## API
+
+### getCommonNames(buffer[, encoding])
+Extracts common names (with "alternative" if present) from buffer. Both `der` and `pem` encodings supported.
+
+### toRegEx(names)
+Generates regular expression that match any of common name extracted before. Supports RegEx simplification, so wildcard and non-wildcard domains are grouped into single expression.
+
+## Thanks to
+* [Fedor Indutny](https://github.com/indutny)<br>
+  For powerful ASN.1 parser library
+
+## LICENSE
+This software is licensed under the MIT License.
+
+Copyright Yury Popov _a.k.a. [PhoeniX](https://phoenix.dj)_, 2016.
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to permit
+persons to whom the Software is furnished to do so, subject to the
+following conditions:
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+USE OR OTHER DEALINGS IN THE SOFTWARE.
\ No newline at end of file
diff --git a/index.js b/index.js
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+++ b/index.js
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+'use strict'
+
+const asn1 = require('asn1.js')
+const asn1Cert = require('asn1.js-rfc3280')
+
+const ASNStr = asn1.define('ASNStr', function () {
+  this.choice({
+    bit: this.bitstr(),
+    bmp: this.bmpstr(),
+    chr: this.charstr(),
+    gen: this.genstr(),
+    grp: this.graphstr(),
+    ia5: this.ia5str(),
+    iso: this.iso646str(),
+    num: this.numstr(),
+    oct: this.octstr(),
+    prt: this.printstr(),
+    t61: this.t61str(),
+    uni: this.unistr(),
+    utf: this.utf8str(),
+    vid: this.videostr()
+  })
+})
+
+function getCommonNames (buffer, encoding) {
+  if (encoding === undefined) {
+    encoding = (/^\s*-----\s*BEGIN/.test(buffer.toString())) ? 'pem' : 'der'
+  }
+  const cert = asn1Cert.Certificate.decode(buffer, encoding, {label: 'CERTIFICATE'})
+  var names = []
+  cert.tbsCertificate.subject.value.forEach((e) => {
+    if (e[0].type.join('.') !== '2.5.4.3') return
+    names.push(ASNStr.decode(e[0].value).value)
+  })
+  cert.tbsCertificate.extensions.forEach((e) => {
+    if (e.extnID.join('.') !== '2.5.29.17') return
+    names.push.apply(names, asn1Cert.GeneralNames.decode(e.extnValue).map((e) => {
+      switch (e.type) {
+        case 'dNSName':
+          return e.value
+        case 'iPAddress':
+          return [e.value[0], e.value[1], e.value[2], e.value[3]].join('.')
+        default:
+          console.log('Unknown type: %s', e.type)
+          return null
+      }
+    }))
+  })
+  return names.filter((e, i, s) => {
+    if (e === null) return false
+    return s.indexOf(e) === i
+  })
+}
+
+function toRegEx (names) {
+  const domains = { wc: [], single: [], both: [] }
+  names.forEach((e) => {
+    var wc = false
+    if (e[0] === '*') {
+      wc = true
+      e = e.split('.').splice(1).join('.')
+    }
+    e = e.replace(/\./g, '\\.')
+    if (wc) domains.wc.push(e)
+    else domains.single.push(e)
+  })
+  domains.wc = domains.wc.filter((e) => {
+    const idx = domains.single.indexOf(e)
+    if (idx === -1) return true
+    domains.single.splice(idx, 1)
+    domains.both.push(e)
+    return false
+  })
+  const entries = []
+  if (domains.single.length > 0) {
+    entries.push(domains.single.join('|'))
+  }
+  if (domains.wc.length > 0) {
+    entries.push('[^\\.]+\\.(' + domains.wc.join('|') + ')')
+  }
+  if (domains.both.length > 0) {
+    entries.push('([^\\.]+\\.)?(' + domains.both.join('|') + ')')
+  }
+  return new RegExp('^((' + entries.join(')|(') + '))$', 'gm')
+}
+
+exports.getCommonNames = getCommonNames
+exports.toRegEx = toRegEx
diff --git a/package.json b/package.json
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+{
+  "name": "certnames",
+  "version": "1.0.0",
+  "description": "Export certificate common names from buffer",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://git.phoenix.dj/phoenix/node-certnames.git"
+  },
+  "keywords": [
+    "x509",
+    "certificate",
+    "asn1"
+  ],
+  "author": "PhoeniX",
+  "license": "MIT",
+  "dependencies": {
+    "asn1.js": "^4.6.2",
+    "asn1.js-rfc3280": "^4.0.0"
+  }
+}