password_encryptions.html.en revision cc7e1025de9ac63bd4db6fe7f71c158b2cf09fe4
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
This file is generated from xml source: DO NOT EDIT
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
-->
<title>Password Formats - Apache HTTP Server</title>
<link href="/style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" />
<link href="/style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" />
<link href="/style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" /><link rel="stylesheet" type="text/css" href="/style/css/prettify.css" />
</script>
<body id="manual-page"><div id="page-header">
<p class="menu"><a href="/mod/">Modules</a> | <a href="/mod/directives.html">Directives</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="/glossary.html">Glossary</a> | <a href="/sitemap.html">Sitemap</a></p>
<p class="apache">Apache HTTP Server Version 2.5</p>
<div id="path">
<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="../">Version 2.5</a> > <a href="./">Miscellaneous Documentation</a></div><div id="page-content"><div id="preamble"><h1>Password Formats</h1>
<div class="toplang">
<p><span>Available Languages: </span><a href="/en/misc/password_encryptions.html" title="English"> en </a></p>
</div>
<p>Notes about the password encryption formats generated and understood by
Apache.</p>
</div>
<div id="quickview"><ul id="toc"><li><img alt="" src="/images/down.gif" /> <a href="#basic">Basic Authentication</a></li>
</ul><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div>
<div class="section">
<h2><a name="basic" id="basic">Basic Authentication</a></h2>
<p>There are four formats that Apache recognizes for basic-authentication
passwords. Note that not all formats work on every platform:</p>
<dl>
<dd>Windows & Netware only.</dd>
<dt>CRYPT</dt>
<dd>Unix only. Uses the traditional Unix <code>crypt(3)</code> function
with a randomly-generated 32-bit salt (only 12 bits used) and the first 8
characters of the password.</dd>
<dt>SHA1</dt>
<dd>"{SHA}" + Base64-encoded SHA-1 digest of the password.</dd>
<dt>MD5</dt>
<dd>"$apr1$" + the result of an Apache-specific algorithm using an
iterated (1,000 times) MD5 digest of various combinations of a
random 32-bit salt and the password. See the APR source file
for the details of the algorithm.</dd>
</dl>
<h3>Generating values with htpasswd</h3>
<div class="example"><h3>MD5</h3><p><code>
$ htpasswd -nbm myName myPassword<br />
myName:$apr1$r31.....$HqJZimcKQFAMYayBlzkrA/
</code></p></div>
<div class="example"><h3>SHA1</h3><p><code>
$ htpasswd -nbs myName myPassword<br />
myName:{SHA}VBPuJHI7uixaa6LQGWx4s+5GKNE=
</code></p></div>
<div class="example"><h3>CRYPT</h3><p><code>
$ htpasswd -nbd myName myPassword<br />
myName:rqXexS6ZhobKA
</code></p></div>
<h3>Generating CRYPT and MD5 values with the OpenSSL
command-line program</h3>
<p>OpenSSL knows the Apache-specific MD5 algorithm.</p>
<div class="example"><h3>MD5</h3><p><code>
$ openssl passwd -apr1 myPassword<br />
$apr1$qHDFfhPC$nITSVHgYbDAK1Y0acGRnY0
</code></p></div>
<div class="example"><h3>CRYPT</h3><p><code>
openssl passwd -crypt myPassword<br />
qQ5vTYO3c8dsU
</code></p></div>
<h3>Validating CRYPT or MD5 passwords with the OpenSSL command
line program</h3>
<p>The salt for a CRYPT password is the first two characters (converted to
a binary value). To validate <code>myPassword</code> against
<code>rqXexS6ZhobKA</code></p>
<div class="example"><h3>CRYPT</h3><p><code>
$ openssl passwd -crypt -salt rq myPassword<br />
Warning: truncating password to 8 characters<br />
rqXexS6ZhobKA
</code></p></div>
<p>Note that using <code>myPasswo</code> instead of
<code>myPassword</code> will produce the same result because only the
first 8 characters of CRYPT passwords are considered.</p>
<p>The salt for an MD5 password is between <code>$apr1$</code> and the
following <code>$</code> (as a Base64-encoded binary value - max 8 chars).
To validate <code>myPassword</code> against
<code>$apr1$r31.....$HqJZimcKQFAMYayBlzkrA/</code></p>
<div class="example"><h3>MD5</h3><p><code>
$ openssl passwd -apr1 -salt r31..... myPassword<br />
$apr1$r31.....$HqJZimcKQFAMYayBlzkrA/
</code></p></div>
<h3>Database password fields for mod_dbd</h3>
<p>The SHA1 variant is probably the most useful format for DBD
authentication. Since the SHA1 and Base64 functions are commonly
available, other software can populate a database with encrypted passwords
that are usable by Apache basic authentication.</p>
<p>To create Apache SHA1-variant basic-authentication passwords in various
languages:</p>
<div class="example"><h3>PHP</h3><p><code>
'{SHA}' . base64_encode(sha1($password, TRUE))
</code></p></div>
<div class="example"><h3>Java</h3><p><code>
"{SHA}" + new sun.misc.BASE64Encoder().encode(java.security.MessageDigest.getInstance("SHA1").digest(password.getBytes()))
</code></p></div>
<div class="example"><h3>ColdFusion</h3><p><code>
"{SHA}" & ToBase64(BinaryDecode(Hash(password, "SHA1"), "Hex"))
</code></p></div>
<div class="example"><h3>Ruby</h3><p><code>
require 'base64'<br />
'{SHA}' + Base64.encode64(Digest::SHA1.digest(password))
</code></p></div>
<div class="example"><h3>C or C++</h3><p><code>
Use the APR function: apr_sha1_base64
</code></p></div>
installed)</h3><p><code>
'{SHA}'||encode(digest(password,'sha1'),'base64')
</code></p></div>
<div class="section">
<h2><a name="digest" id="digest">Digest Authentication</a></h2>
<p>Apache recognizes one format for
digest-authentication passwords - the MD5 hash of the string
<code>user:realm:password</code> as a 32-character string of hexadecimal
digits. <code>realm</code> is the Authorization Realm argument to the
<code class="directive"><a href="/mod/mod_authn_core.html#authname">AuthName</a></code> directive in
httpd.conf.</p>
<h3>Database password fields for mod_dbd</h3>
<p>Since the MD5 function is commonly available, other software can
populate a database with encrypted passwords that are usable by Apache
digest authentication.</p>
<p>To create Apache digest-authentication passwords in various
languages:</p>
<div class="example"><h3>PHP</h3><p><code>
md5($user . ':' . $realm . ':' .$password)
</code></p></div>
<div class="example"><h3>Java</h3><p><code>
byte b[] = java.security.MessageDigest.getInstance("MD5").digest( (user + ":" + realm + ":" + password ).getBytes());<br />
String s = bi.toString(16);<br />
while (s.length() < 32)<br />
<span class="indent">
s = "0" + s;
</span>
// String s is the encrypted password
</code></p></div>
<div class="example"><h3>ColdFusion</h3><p><code>
LCase(Hash( (user & ":" & realm & ":" & password) , "MD5"))
</code></p></div>
<div class="example"><h3>Ruby</h3><p><code>
Digest::MD5.hexdigest(user + ':' + realm + ':' + password)
</code></p></div>
encode(digest( user || ':' || realm || ':' || password , 'md5'), 'hex')
</code></p></div>
</div></div>
<div class="bottomlang">
<p><span>Available Languages: </span><a href="/en/misc/password_encryptions.html" title="English"> en </a></p>
</div><div class="top"><a href="#page-header"><img src="/images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Comments</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed again by our moderators if they are either implemented or considered invalid/off-topic. Questions on how to manage the Apache HTTP Server should be directed at either our IRC channel, #httpd, on Freenode, or sent to our <a href="http://httpd.apache.org/lists.html">mailing lists</a>.</div>
var comments_shortname = 'httpd';
var comments_identifier = 'http://httpd.apache.org/docs/trunk/misc/password_encryptions.html';
(function(w, d) {
if (w.location.hostname.toLowerCase() == "httpd.apache.org") {
d.write('<div id="comments_thread"><\/div>');
var s = d.createElement('script');
s.type = 'text/javascript';
s.async = true;
s.src = 'http://c.apaste.info/show_comments.lua?site=' + comments_shortname + '&page=' + comments_identifier;
(d.getElementsByTagName('head')[0] || d.getElementsByTagName('body')[0]).appendChild(s);
}
else {
d.write('<div id="comments_thread">Comments are disabled for this page at the moment.<\/div>');
}
})(window, document);
//--><!]]></script></div><div id="footer">
<p class="apache">Copyright 2012 The Apache Software Foundation.<br />Licensed under the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>.</p>
<p class="menu"><a href="/mod/">Modules</a> | <a href="/mod/directives.html">Directives</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="/glossary.html">Glossary</a> | <a href="/sitemap.html">Sitemap</a></p></div><script type="text/javascript"><!--//--><![CDATA[//><!--
if (typeof(prettyPrint) !== 'undefined') {
prettyPrint();
}
//--><!]]></script>
</body></html>