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<section id="passlib-hash-pbkdf2-digest-generic-pbkdf2-hashes">
<h1><code class="samp docutils literal notranslate"><span class="pre">passlib.hash.pbkdf2_</span><em><span class="pre">digest</span></em></code> - Generic PBKDF2 Hashes<a class="headerlink" href="#passlib-hash-pbkdf2-digest-generic-pbkdf2-hashes" title="Link to this heading">¶</a></h1>
<p id="index-0">Passlib provides three custom hash schemes based on the PBKDF2 <a class="footnote-reference brackets" href="#pbkdf2" id="id1" role="doc-noteref"><span class="fn-bracket">[</span>1<span class="fn-bracket">]</span></a> algorithm
which are compatible with the <a class="reference internal" href="../modular_crypt_format.html#modular-crypt-format"><span class="std std-ref">modular crypt format</span></a>:</p>
<ul class="simple">
<li><p><a class="reference internal" href="#passlib.hash.pbkdf2_sha1" title="passlib.hash.pbkdf2_sha1"><code class="xref py py-class docutils literal notranslate"><span class="pre">pbkdf2_sha1</span></code></a></p></li>
<li><p><a class="reference internal" href="#passlib.hash.pbkdf2_sha256" title="passlib.hash.pbkdf2_sha256"><code class="xref py py-class docutils literal notranslate"><span class="pre">pbkdf2_sha256</span></code></a></p></li>
<li><p><a class="reference internal" href="#passlib.hash.pbkdf2_sha512" title="passlib.hash.pbkdf2_sha512"><code class="xref py py-class docutils literal notranslate"><span class="pre">pbkdf2_sha512</span></code></a></p></li>
</ul>
<p>Security-wise, PBKDF2 is currently one of the leading key derivation functions,
and has no known security issues.
Though the original PBKDF2 specification uses the SHA-1 message digest,
it is not vulnerable to any of the known weaknesses of SHA-1 <a class="footnote-reference brackets" href="#hmac-sha1" id="id2" role="doc-noteref"><span class="fn-bracket">[</span>2<span class="fn-bracket">]</span></a>,
and can be safely used. However, for those still concerned, SHA-256 and SHA-512
versions are offered as well.
PBKDF2-SHA512 is one of the four hashes Passlib
<a class="reference internal" href="../narr/quickstart.html#recommended-hashes"><span class="std std-ref">recommends</span></a> for new applications.</p>
<p>All of these classes can be used directly as follows:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="kn">from</span> <span class="nn">passlib.hash</span> <span class="kn">import</span> <span class="n">pbkdf2_sha256</span>
<span class="gp">>>> </span><span class="c1"># generate new salt, hash password</span>
<span class="gp">>>> </span><span class="nb">hash</span> <span class="o">=</span> <span class="n">pbkdf2_sha256</span><span class="o">.</span><span class="n">hash</span><span class="p">(</span><span class="s2">"password"</span><span class="p">)</span>
<span class="gp">>>> </span><span class="nb">hash</span>
<span class="go">'$pbkdf2-sha256$6400$0ZrzXitFSGltTQnBWOsdAw$Y11AchqV4b0sUisdZd0Xr97KWoymNE0LNNrnEgY4H9M'</span>
<span class="gp">>>> </span><span class="c1"># same, but with an explicit number of rounds and salt length</span>
<span class="gp">>>> </span><span class="n">pbkdf2_sha256</span><span class="o">.</span><span class="n">using</span><span class="p">(</span><span class="n">rounds</span><span class="o">=</span><span class="mi">8000</span><span class="p">,</span> <span class="n">salt_size</span><span class="o">=</span><span class="mi">10</span><span class="p">)</span><span class="o">.</span><span class="n">hash</span><span class="p">(</span><span class="s2">"password"</span><span class="p">)</span>
<span class="go">'$pbkdf2-sha256$8000$XAuBMIYQQogxRg$tRRlz8hYn63B9LYiCd6PRo6FMiunY9ozmMMI3srxeRE'</span>
<span class="gp">>>> </span><span class="c1"># verify the password</span>
<span class="gp">>>> </span><span class="n">pbkdf2_sha256</span><span class="o">.</span><span class="n">verify</span><span class="p">(</span><span class="s2">"password"</span><span class="p">,</span> <span class="nb">hash</span><span class="p">)</span>
<span class="go">True</span>
<span class="gp">>>> </span><span class="n">pbkdf2_sha256</span><span class="o">.</span><span class="n">verify</span><span class="p">(</span><span class="s2">"wrong"</span><span class="p">,</span> <span class="nb">hash</span><span class="p">)</span>
<span class="go">False</span>
</pre></div>
</div>
<div class="admonition seealso">
<p class="admonition-title">See also</p>
<ul class="simple">
<li><p><a class="reference internal" href="../narr/hash-tutorial.html#password-hash-examples"><span class="std std-ref">password hash usage</span></a> – for more usage examples</p></li>
<li><p><a class="reference internal" href="passlib.hash.ldap_pbkdf2_digest.html"><span class="doc">ldap_pbkdf2_{digest}</span></a> –
alternate LDAP-compatible versions of these hashes.</p></li>
</ul>
</div>
<section id="interface">
<h2>Interface<a class="headerlink" href="#interface" title="Link to this heading">¶</a></h2>
<dl class="py class">
<dt class="sig sig-object py" id="passlib.hash.pbkdf2_sha256">
<em class="property"><span class="k"><span class="pre">class</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">passlib.hash.</span></span><span class="sig-name descname"><span class="pre">pbkdf2_sha256</span></span><a class="headerlink" href="#passlib.hash.pbkdf2_sha256" title="Link to this definition">¶</a></dt>
<dd><p>This class implements a generic <code class="docutils literal notranslate"><span class="pre">PBKDF2-HMAC-SHA256</span></code>-based password hash, and follows the <a class="reference internal" href="passlib.ifc.html#password-hash-api"><span class="std std-ref">PasswordHash API</span></a>.</p>
<p>It supports a variable-length salt, and a variable number of rounds.</p>
<p>The <a class="reference internal" href="passlib.ifc.html#passlib.ifc.PasswordHash.using" title="passlib.ifc.PasswordHash.using"><code class="xref py py-meth docutils literal notranslate"><span class="pre">using()</span></code></a> method accepts the following optional keywords:</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters<span class="colon">:</span></dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>salt</strong> (<em>bytes</em>) – Optional salt bytes.
If specified, the length must be between 0-1024 bytes.
If not specified, a 16 byte salt will be autogenerated (this is recommended).</p></li>
<li><p><strong>salt_size</strong> (<em>int</em>) – Optional number of bytes to use when autogenerating new salts.
Defaults to 16 bytes, but can be any value between 0 and 1024.</p></li>
<li><p><strong>rounds</strong> (<em>int</em>) – Optional number of rounds to use.
Defaults to 29000, but must be within <code class="docutils literal notranslate"><span class="pre">range(1,1<<32)</span></code>.</p></li>
<li><p><strong>relaxed</strong> (<em>bool</em>) – <p>By default, providing an invalid value for one of the other
keywords will result in a <code class="xref py py-exc docutils literal notranslate"><span class="pre">ValueError</span></code>. If <code class="docutils literal notranslate"><span class="pre">relaxed=True</span></code>,
and the error can be corrected, a <a class="reference internal" href="passlib.exc.html#passlib.exc.PasslibHashWarning" title="passlib.exc.PasslibHashWarning"><code class="xref py py-exc docutils literal notranslate"><span class="pre">PasslibHashWarning</span></code></a>
will be issued instead. Correctable errors include <code class="docutils literal notranslate"><span class="pre">rounds</span></code>
that are too small or too large, and <code class="docutils literal notranslate"><span class="pre">salt</span></code> strings that are too long.</p>
<div class="versionadded">
<p><span class="versionmodified added">Added in version 1.6.</span></p>
</div>
</p></li>
</ul>
</dd>
</dl>
</dd></dl>
<dl class="py class">
<dt class="sig sig-object py" id="passlib.hash.pbkdf2_sha512">
<em class="property"><span class="k"><span class="pre">class</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">passlib.hash.</span></span><span class="sig-name descname"><span class="pre">pbkdf2_sha512</span></span><a class="headerlink" href="#passlib.hash.pbkdf2_sha512" title="Link to this definition">¶</a></dt>
<dd><p>except for the choice of message digest,
this class is the same as <a class="reference internal" href="#passlib.hash.pbkdf2_sha256" title="passlib.hash.pbkdf2_sha256"><code class="xref py py-class docutils literal notranslate"><span class="pre">pbkdf2_sha256</span></code></a>.</p>
</dd></dl>
<dl class="py class">
<dt class="sig sig-object py" id="passlib.hash.pbkdf2_sha1">
<em class="property"><span class="k"><span class="pre">class</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">passlib.hash.</span></span><span class="sig-name descname"><span class="pre">pbkdf2_sha1</span></span><a class="headerlink" href="#passlib.hash.pbkdf2_sha1" title="Link to this definition">¶</a></dt>
<dd><p>except for the choice of message digest,
this class is the same as <a class="reference internal" href="#passlib.hash.pbkdf2_sha256" title="passlib.hash.pbkdf2_sha256"><code class="xref py py-class docutils literal notranslate"><span class="pre">pbkdf2_sha256</span></code></a>.</p>
</dd></dl>
</section>
<section id="format-algorithm">
<span id="mcf-pbkdf2-format"></span><h2>Format & Algorithm<a class="headerlink" href="#format-algorithm" title="Link to this heading">¶</a></h2>
<p>An example <code class="xref py py-class docutils literal notranslate"><span class="pre">pbkdf2_sha256</span></code> hash (of <code class="docutils literal notranslate"><span class="pre">password</span></code>):</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$pbkdf2-sha256$6400$.6UI/S.nXIk8jcbdHx3Fhg$98jZicV16ODfEsEZeYPGHU3kbrUrvUEXOPimVSQDD44
</pre></div>
</div>
<p>All of the pbkdf2 hashes defined by passlib
follow the same format, <code class="samp docutils literal notranslate"><span class="pre">$pbkdf2-</span><em><span class="pre">digest</span></em><span class="pre">$</span><em><span class="pre">rounds</span></em><span class="pre">$</span><em><span class="pre">salt</span></em><span class="pre">$</span><em><span class="pre">checksum</span></em></code>.</p>
<ul class="simple">
<li><p><code class="samp docutils literal notranslate"><span class="pre">$pbkdf2-</span><em><span class="pre">digest</span></em><span class="pre">$</span></code> is used as the <a class="reference internal" href="../modular_crypt_format.html#modular-crypt-format"><span class="std std-ref">Modular Crypt Format</span></a> identifier
(<code class="docutils literal notranslate"><span class="pre">$pbkdf2-sha256$</span></code> in the example).</p></li>
<li><p><code class="samp docutils literal notranslate"><em><span class="pre">digest</span></em></code> - this specifies the particular cryptographic hash
used in conjunction with HMAC to form PBKDF2’s pseudorandom function
for that particular hash (<code class="docutils literal notranslate"><span class="pre">sha256</span></code> in the example).</p></li>
<li><p><code class="samp docutils literal notranslate"><em><span class="pre">rounds</span></em></code> - the number of iterations that should be performed.
this is encoded as a positive decimal number with no zero-padding
(<code class="docutils literal notranslate"><span class="pre">6400</span></code> in the example).</p></li>
<li><p><code class="samp docutils literal notranslate"><em><span class="pre">salt</span></em></code> - this is the <a class="reference internal" href="passlib.utils.binary.html#passlib.utils.binary.ab64_encode" title="passlib.utils.binary.ab64_encode"><code class="xref py py-func docutils literal notranslate"><span class="pre">adapted</span> <span class="pre">base64</span> <span class="pre">encoding</span></code></a>
of the raw salt bytes passed into the PBKDF2 function.</p></li>
<li><p><code class="samp docutils literal notranslate"><em><span class="pre">checksum</span></em></code> - this is the <a class="reference internal" href="passlib.utils.binary.html#passlib.utils.binary.ab64_encode" title="passlib.utils.binary.ab64_encode"><code class="xref py py-func docutils literal notranslate"><span class="pre">adapted</span> <span class="pre">base64</span> <span class="pre">encoding</span></code></a>
of the raw derived key bytes returned from the PBKDF2 function.
Each scheme uses the digest size of its specific hash algorithm (<code class="samp docutils literal notranslate"><em><span class="pre">digest</span></em></code>)
as the size of the raw derived key. This is enlarged
by approximately 4/3 by the base64 encoding,
resulting in a checksum size of 27, 43, and 86 for each of the respective algorithms listed above.</p></li>
</ul>
<p>The algorithm used by all of these schemes is deliberately identical and simple:
The password is encoded into UTF-8 if not already encoded,
and run through <a class="reference internal" href="passlib.crypto.digest.html#passlib.crypto.digest.pbkdf2_hmac" title="passlib.crypto.digest.pbkdf2_hmac"><code class="xref py py-func docutils literal notranslate"><span class="pre">pbkdf2_hmac()</span></code></a>
along with the decoded salt, the number of rounds,
and a prf built from HMAC + the respective message digest.
The result is then encoded using <a class="reference internal" href="passlib.utils.binary.html#passlib.utils.binary.ab64_encode" title="passlib.utils.binary.ab64_encode"><code class="xref py py-func docutils literal notranslate"><span class="pre">ab64_encode()</span></code></a>.</p>
<p class="rubric">Footnotes</p>
<aside class="footnote-list brackets">
<aside class="footnote brackets" id="pbkdf2" role="doc-footnote">
<span class="label"><span class="fn-bracket">[</span><a role="doc-backlink" href="#id1">1</a><span class="fn-bracket">]</span></span>
<p>The specification for the PBKDF2 algorithm - <a class="reference external" href="http://tools.ietf.org/html/rfc2898#section-5.2">http://tools.ietf.org/html/rfc2898#section-5.2</a>,
part of <span class="target" id="index-1"></span><a class="rfc reference external" href="https://datatracker.ietf.org/doc/html/rfc2898.html"><strong>RFC 2898</strong></a>.</p>
</aside>
<aside class="footnote brackets" id="hmac-sha1" role="doc-footnote">
<span class="label"><span class="fn-bracket">[</span><a role="doc-backlink" href="#id2">2</a><span class="fn-bracket">]</span></span>
<p>While SHA1 has fallen to collision attacks, HMAC-SHA1 as used by PBKDF2
is still considered secure - <a class="reference external" href="http://www.schneier.com/blog/archives/2005/02/sha1_broken.html">http://www.schneier.com/blog/archives/2005/02/sha1_broken.html</a>.</p>
</aside>
</aside>
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<h3><a href="../contents.html">Table of Contents</a></h3>
<ul class="current">
<li class="toctree-l1"><a class="reference internal" href="../index.html">Introduction</a></li>
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<li class="toctree-l2"><a class="reference internal" href="passlib.apache.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">passlib.apache</span></code> - Apache Password Files</a></li>
<li class="toctree-l2"><a class="reference internal" href="passlib.apps.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">passlib.apps</span></code> - Helpers for various applications</a></li>
<li class="toctree-l2"><a class="reference internal" href="passlib.context.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">passlib.context</span></code> - CryptContext Hash Manager</a></li>
<li class="toctree-l2"><a class="reference internal" href="passlib.crypto.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">passlib.crypto</span></code> - Cryptographic Helper Functions</a></li>
<li class="toctree-l2"><a class="reference internal" href="passlib.exc.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">passlib.exc</span></code> - Exceptions and warnings</a></li>
<li class="toctree-l2"><a class="reference internal" href="passlib.ext.django.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">passlib.ext.django</span></code> - Django Password Hashing Plugin</a></li>
<li class="toctree-l2 current"><a class="reference internal" href="passlib.hash.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">passlib.hash</span></code> - Password Hashing Schemes</a><ul class="current">
<li class="toctree-l3"><a class="reference internal" href="passlib.hash.html#overview">Overview</a></li>
<li class="toctree-l3"><a class="reference internal" href="passlib.hash.html#unix-hashes">Unix Hashes</a></li>
<li class="toctree-l3 current"><a class="reference internal" href="passlib.hash.html#other-modular-crypt-hashes">Other “Modular Crypt” Hashes</a><ul class="current">
<li class="toctree-l4 current"><a class="reference internal" href="passlib.hash.html#active-hashes">Active Hashes</a></li>
<li class="toctree-l4"><a class="reference internal" href="passlib.hash.html#deprecated-hashes">Deprecated Hashes</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="passlib.hash.html#ldap-rfc2307-hashes">LDAP / RFC2307 Hashes</a></li>
<li class="toctree-l3"><a class="reference internal" href="passlib.hash.html#sql-database-hashes">SQL Database Hashes</a></li>
<li class="toctree-l3"><a class="reference internal" href="passlib.hash.html#ms-windows-hashes">MS Windows Hashes</a></li>
<li class="toctree-l3"><a class="reference internal" href="passlib.hash.html#cisco-hashes">Cisco Hashes</a></li>
<li class="toctree-l3"><a class="reference internal" href="passlib.hash.html#other-hashes">Other Hashes</a></li>
</ul>
</li>
<li class="toctree-l2"><a class="reference internal" href="passlib.hosts.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">passlib.hosts</span></code> - OS Password Handling</a></li>
<li class="toctree-l2"><a class="reference internal" href="passlib.ifc.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">passlib.ifc</span></code> – Password Hash Interface</a></li>
<li class="toctree-l2"><a class="reference internal" href="passlib.pwd.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">passlib.pwd</span></code> – Password generation helpers</a></li>
<li class="toctree-l2"><a class="reference internal" href="passlib.registry.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">passlib.registry</span></code> - Password Handler Registry</a></li>
<li class="toctree-l2"><a class="reference internal" href="passlib.totp.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">passlib.totp</span></code> – TOTP / Two Factor Authentication</a></li>
<li class="toctree-l2"><a class="reference internal" href="passlib.utils.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">passlib.utils</span></code> - Helper Functions</a></li>
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