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<title>Password Formats - Apache HTTP Server</title>
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<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 2.3</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>
<li><img alt="" src="../images/down.gif" /> <a href="#digest">Digest Authentication</a></li>
</ul></div>
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<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>
<dt>PLAIN TEXT (i.e. <em>unencrypted</em>)</dt>
<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
<a href="http://svn.apache.org/viewvc/apr/apr/trunk/crypto/apr_md5.c?view=markup">apr_md5.c</a>
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 'digest/sha1'<br />
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>
<div class="example"><h3>PostgreSQL (with the contrib/pgcrypto functions
installed)</h3><p><code>
'{SHA}'||encode(digest(password,'sha1'),'base64')
</code></p></div>
</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></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 />
java.math.BigInteger bi = new java.math.BigInteger(1, b);<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>
require 'digest/md5'<br />
Digest::MD5.hexdigest(user + ':' + realm + ':' + password)
</code></p></div>
<div class="example"><h3>PostgreSQL (with the contrib/pgcrypto functions installed)</h3><p><code>
encode(digest( user || ':' || realm || ':' || password , 'md5'), 'hex')
</code></p></div>
</div></div>
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