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<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE manualpage SYSTEM "../style/manualpage.dtd">
<?xml-stylesheet type="text/xsl" href="../style/manual.en.xsl"?>
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<manualpage metafile="password_encryptions.xml.meta">
<parentdocument href="./">Miscellaneous Documentation</parentdocument>
<title>Password Formats</title>
<summary>
<p>Notes about the password encryption formats generated and understood by
Apache.</p>
</summary>
<section id="basic"><title>Basic Authentication</title>
<p>There are five formats that Apache recognizes for basic-authentication
passwords. Note that not all formats work on every platform:</p>
<dl>
<dt>bcrypt</dt>
<dd>"$2y$" + the result of the crypt_blowfish algorithm.
See the APR source file
<a href="http://svn.apache.org/viewvc/apr/apr/trunk/crypto/crypt_blowfish.c?view=markup">crypt_blowfish.c</a>
for the details of the algorithm.</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>
<dt>SHA1</dt>
<dd>"{SHA}" + Base64-encoded SHA-1 digest of the password. Insecure.</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. Insecure.</dd>
<dt>PLAIN TEXT (i.e. <em>unencrypted</em>)</dt>
<dd>Windows & Netware only. Insecure.</dd>
</dl>
<section><title>Generating values with htpasswd</title>
<example><title>bcrypt</title>
$ htpasswd -nbB myName myPassword<br />
myName:$2y$05$c4WoMPo3SXsafkva.HHa6uXQZWr7oboPiC2bT/r7q1BB8I2s0BRqC
</example>
<example><title>MD5</title>
$ htpasswd -nbm myName myPassword<br />
myName:$apr1$r31.....$HqJZimcKQFAMYayBlzkrA/
</example>
<example><title>SHA1</title>
$ htpasswd -nbs myName myPassword<br />
myName:{SHA}VBPuJHI7uixaa6LQGWx4s+5GKNE=
</example>
<example><title>CRYPT</title>
$ htpasswd -nbd myName myPassword<br />
myName:rqXexS6ZhobKA
</example>
</section>
<section>
<title>Generating CRYPT and MD5 values with the OpenSSL
command-line program</title>
<p>OpenSSL knows the Apache-specific MD5 algorithm.</p>
<example><title>MD5</title>
$ openssl passwd -apr1 myPassword<br />
$apr1$qHDFfhPC$nITSVHgYbDAK1Y0acGRnY0
</example>
<example><title>CRYPT</title>
openssl passwd -crypt myPassword<br />
qQ5vTYO3c8dsU
</example>
</section>
<section>
<title>Validating CRYPT or MD5 passwords with the OpenSSL command
line program</title>
<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>
<example><title>CRYPT</title>
$ openssl passwd -crypt -salt rq myPassword<br />
Warning: truncating password to 8 characters<br />
rqXexS6ZhobKA
</example>
<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>
<example><title>MD5</title>
$ openssl passwd -apr1 -salt r31..... myPassword<br />
$apr1$r31.....$HqJZimcKQFAMYayBlzkrA/
</example>
</section>
<section><title>Database password fields for mod_dbd</title>
<p>The SHA1 variant is probably the most useful format for DBD
authentication. Since the SHA1 and Base64 functions are commonly
available, other software can populate a database with encrypted passwords
that are usable by Apache basic authentication.</p>
<p>To create Apache SHA1-variant basic-authentication passwords in various
languages:</p>
<example><title>PHP</title>
'{SHA}' . base64_encode(sha1($password, TRUE))
</example>
<example><title>Java</title>
"{SHA}" + new sun.misc.BASE64Encoder().encode(java.security.MessageDigest.getInstance("SHA1").digest(password.getBytes()))
</example>
<example><title>ColdFusion</title>
"{SHA}" & ToBase64(BinaryDecode(Hash(password, "SHA1"), "Hex"))
</example>
<example><title>Ruby</title>
require 'digest/sha1'<br />
require 'base64'<br />
'{SHA}' + Base64.encode64(Digest::SHA1.digest(password))
</example>
<example><title>C or C++</title>
Use the APR function: apr_sha1_base64
</example>
<example>
<title>PostgreSQL (with the contrib/pgcrypto functions
installed)</title>
'{SHA}'||encode(digest(password,'sha1'),'base64')
</example>
</section>
</section>
<section id="digest"><title>Digest Authentication</title>
<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
<directive module="mod_authn_core">AuthName</directive> directive in
httpd.conf.</p>
<section><title>Database password fields for mod_dbd</title>
<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>
<example><title>PHP</title>
md5($user . ':' . $realm . ':' .$password)
</example>
<example><title>Java</title>
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 />
<indent>
s = "0" + s;
</indent>
// String s is the encrypted password
</example>
<example><title>ColdFusion</title>
LCase(Hash( (user & ":" & realm & ":" & password) , "MD5"))
</example>
<example><title>Ruby</title>
require 'digest/md5'<br />
Digest::MD5.hexdigest(user + ':' + realm + ':' + password)
</example>
<example>
<title>PostgreSQL (with the contrib/pgcrypto functions installed)</title>
encode(digest( user || ':' || realm || ':' || password , 'md5'), 'hex')
</example>
</section>
</section>
</manualpage>
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