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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 330612 $ -->
<appendix xml:id="password.constants" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
&reftitle.constants;
&extension.constants.core;
<para>
<variablelist>
<varlistentry xml:id="constant.password-bcrypt">
<term>
<constant>PASSWORD_BCRYPT</constant>
(<type>integer</type>)
</term>
<listitem>
<para>
<constant>PASSWORD_BCRYPT</constant> is used to create new password
hashes using the <constant>CRYPT_BLOWFISH</constant> algorithm.
</para>
<para>
This will always result in a hash using the "$2y$" crypt format,
which is always 60 characters wide.
</para>
<para>
Supported Options:
</para>
<itemizedlist>
<listitem>
<para>
<literal>salt</literal> - to manually provide a salt to use when hashing the password.
Note that this will override and prevent a salt from being automatically generated.
</para>
<para>
If omitted, a random salt will be generated by <function>password_hash</function> for
each password hashed. This is the intended mode of operation.
</para>
</listitem>
<listitem>
<para>
<literal>cost</literal> - which denotes the algorithmic cost that should be used.
Examples of these values can be found on the <function>crypt</function> page.
</para>
<para>
If ommitted, a default value of <literal>10</literal> will be used. This is a good
baseline cost, but you may want to consider increasing it depending on your hardware.
</para>
</listitem>
</itemizedlist>
</listitem>
</varlistentry>
<varlistentry xml:id="constant.password-default">
<term>
<constant>PASSWORD_DEFAULT</constant>
(<type>integer</type>)
</term>
<listitem>
<para>
The default algorithm to use for hashing if no algorithm is provided.
This may change in newer PHP releases when newer, stronger hashing
algorithms are supported.
</para>
<para>
It is worth noting that over time this constant can (and likely will)
change. Therefore you should be aware that the length of the resulting
hash can change. Therefore, if you use <constant>PASSWORD_DEFAULT</constant>
you should store the resulting hash in a way that can store more than 60
characters (255 is the recomended width).
</para>
<para>
Values for this constant:
</para>
<itemizedlist>
<listitem>
<simpara>
PHP 5.5.0 - <constant>PASSWORD_BCRYPT</constant>
</simpara>
</listitem>
</itemizedlist>
</listitem>
</varlistentry>
</variablelist>
</para>
</appendix>
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