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<title>hash_password(1) - Calculate the hash of a new password, so that passwords can be reset</title>
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<a href="#NAME">NAME</a>
<a href="#SYNOPSIS">SYNOPSIS</a>
<a href="#DESCRIPTION">DESCRIPTION</a>
<a href="#FILES">FILES</a>
<a href="#OPTIONS">OPTIONS</a>
<a href="#EXAMPLES">EXAMPLES</a>
<a href="#COPYRIGHT">COPYRIGHT</a>
<a href="#SEE-ALSO">SEE ALSO</a>
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<ol class='man-decor man-head man head'>
<li class='tl'>hash_password(1)</li>
<li class='tc'></li>
<li class='tr'>hash_password(1)</li>
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<h2 id="NAME">NAME</h2>
<p class="man-name">
<code>hash_password</code> - <span class="man-whatis">Calculate the hash of a new password, so that passwords can be reset</span>
</p>
<h2 id="SYNOPSIS">SYNOPSIS</h2>
<table>
<tbody>
<tr>
<td>
<code>hash_password</code> [<code>-p</code>
</td>
<td>
<code>--password</code> [password]] [<code>-c</code>
</td>
<td>
<code>--config</code> <var>file</var>]</td>
</tr>
</tbody>
</table>
<h2 id="DESCRIPTION">DESCRIPTION</h2>
<p><strong>hash_password</strong> calculates the hash of a supplied password using bcrypt.</p>
<p><code>hash_password</code> takes a password as an parameter either on the command line
or the <code>STDIN</code> if not supplied.</p>
<p>It accepts an YAML file which can be used to specify parameters like the
number of rounds for bcrypt and password_config section having the pepper
value used for the hashing. By default <code>bcrypt_rounds</code> is set to <strong>12</strong>.</p>
<p>The hashed password is written on the <code>STDOUT</code>.</p>
<h2 id="FILES">FILES</h2>
<p>A sample YAML file accepted by <code>hash_password</code> is described below:</p>
<p>bcrypt_rounds: 17
password_config:
pepper: "random hashing pepper"</p>
<h2 id="OPTIONS">OPTIONS</h2>
<dl>
<dt>
<code>-p</code>, <code>--password</code>
</dt>
<dd>Read the password form the command line if [password] is supplied, or from <code>STDIN</code>.
If not, prompt the user and read the password from the tty prompt.
It is not recommended to type the password on the command line
directly. Use the STDIN instead.</dd>
<dt>
<code>-c</code>, <code>--config</code>
</dt>
<dd>Read the supplied YAML <var>file</var> containing the options <code>bcrypt_rounds</code>
and the <code>password_config</code> section containing the <code>pepper</code> value.</dd>
</dl>
<h2 id="EXAMPLES">EXAMPLES</h2>
<p>Hash from the command line:</p>
<pre><code>$ hash_password -p "p@ssw0rd"
$2b$12$VJNqWQYfsWTEwcELfoSi4Oa8eA17movHqqi8.X8fWFpum7SxZ9MFe
</code></pre>
<p>Hash from the stdin:</p>
<pre><code>$ cat password_file | hash_password
Password:
Confirm password:
$2b$12$AszlvfmJl2esnyhmn8m/kuR2tdXgROWtWxnX.rcuAbM8ErLoUhybG
</code></pre>
<p>Hash from the prompt:</p>
<pre><code>$ hash_password
Password:
Confirm password:
$2b$12$AszlvfmJl2esnyhmn8m/kuR2tdXgROWtWxnX.rcuAbM8ErLoUhybG
</code></pre>
<p>Using a config file:</p>
<pre><code>$ hash_password -c config.yml
Password:
Confirm password:
$2b$12$CwI.wBNr.w3kmiUlV3T5s.GT2wH7uebDCovDrCOh18dFedlANK99O
</code></pre>
<h2 id="COPYRIGHT">COPYRIGHT</h2>
<p>This man page was written by Rahul De «rahulde@swecha.net»
for Debian GNU/Linux distribution.</p>
<h2 id="SEE-ALSO">SEE ALSO</h2>
<p><span class="man-ref">synctl<span class="s">(1)</span></span>, <span class="man-ref">synapse_port_db<span class="s">(1)</span></span>, <span class="man-ref">register_new_matrix_user<span class="s">(1)</span></span>, <span class="man-ref">synapse_review_recent_signups<span class="s">(1)</span></span></p>
<ol class='man-decor man-foot man foot'>
<li class='tl'></li>
<li class='tc'>August 2024</li>
<li class='tr'>hash_password(1)</li>
</ol>
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