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<td >Qt 5.12</td><td ><a href="qtnetwork-index.html">Qt Network</a></td><td >QPasswordDigestor Namespace</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right"><a href="qtnetwork-index.html">Qt 5.12.6 Reference Documentation</a></td>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#functions">Functions</a></li>
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<h1 class="title">QPasswordDigestor Namespace</h1>
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<p>The <a href="qpassworddigestor.html">QPasswordDigestor</a> namespace contains functions which you can use to generate hashes or keys. <a href="#details">More...</a></p>
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<tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign"> <span class="preprocessor">#include <QPasswordDigestor></span>
</td></tr><tr><td class="memItemLeft rightAlign topAlign"> qmake:</td><td class="memItemRight bottomAlign"> QT += network</td></tr></table></div><ul>
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<h2 id="functions">Functions</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> QByteArray </td><td class="memItemRight bottomAlign"><b><a href="qpassworddigestor.html#deriveKeyPbkdf1">deriveKeyPbkdf1</a></b>(QCryptographicHash::Algorithm <i>algorithm</i>, const QByteArray &<i>data</i>, const QByteArray &<i>salt</i>, int <i>iterations</i>, quint64 <i>dkLen</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QByteArray </td><td class="memItemRight bottomAlign"><b><a href="qpassworddigestor.html#deriveKeyPbkdf2">deriveKeyPbkdf2</a></b>(QCryptographicHash::Algorithm <i>algorithm</i>, const QByteArray &<i>data</i>, const QByteArray &<i>salt</i>, int <i>iterations</i>, quint64 <i>dkLen</i>)</td></tr>
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<h2 id="details">Detailed Description</h2>
<p>The <a href="qpassworddigestor.html">QPasswordDigestor</a> namespace contains functions which you can use to generate hashes or keys.</p>
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<h2>Function Documentation</h2>
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<h3 class="fn" id="deriveKeyPbkdf1"><a name="deriveKeyPbkdf1"></a><span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span> QPasswordDigestor::<span class="name">deriveKeyPbkdf1</span>(<span class="type"><a href="../qtcore/qcryptographichash.html#Algorithm-enum">QCryptographicHash::Algorithm</a></span> <i>algorithm</i>, const <span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span> &<i>data</i>, const <span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span> &<i>salt</i>, <span class="type">int</span> <i>iterations</i>, <span class="type"><a href="../qtcore/qtglobal.html#quint64-typedef">quint64</a></span> <i>dkLen</i>)</h3>
<p>Returns a hash computed using the PBKDF1-algorithm as defined in <a href="https://tools.ietf.org/html/rfc8018#section-5.1">RFC 8018</a>.</p>
<p>The function takes the <i>data</i> and <i>salt</i>, and then hashes it repeatedly for <i>iterations</i> iterations using the specified hash <i>algorithm</i>. If the resulting hash is longer than <i>dkLen</i> then it is truncated before it is returned.</p>
<p>This function only supports SHA-1 and MD5! The max output size is 160 bits (20 bytes) when using SHA-1, or 128 bits (16 bytes) when using MD5. Specifying a value for <i>dkLen</i> which is greater than this results in a warning and an empty <a href="../qtcore/qbytearray.html">QByteArray</a> is returned. To programmatically check this limit you can use <a href="../qtcore/qcryptographichash.html#hashLength">QCryptographicHash::hashLength</a>. Furthermore: the <i>salt</i> must always be 8 bytes long!</p>
<p><b>Note: </b>This function is provided for use with legacy applications and all new applications are recommended to use <a href="qpassworddigestor.html#deriveKeyPbkdf2">PBKDF2</a>.</p><p>This function was introduced in Qt 5.12.</p>
<p><b>See also </b><a href="qpassworddigestor.html#deriveKeyPbkdf2">deriveKeyPbkdf2</a>, <a href="../qtcore/qcryptographichash.html">QCryptographicHash</a>, and <a href="../qtcore/qcryptographichash.html#hashLength">QCryptographicHash::hashLength</a>.</p>
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<h3 class="fn" id="deriveKeyPbkdf2"><a name="deriveKeyPbkdf2"></a><span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span> QPasswordDigestor::<span class="name">deriveKeyPbkdf2</span>(<span class="type"><a href="../qtcore/qcryptographichash.html#Algorithm-enum">QCryptographicHash::Algorithm</a></span> <i>algorithm</i>, const <span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span> &<i>data</i>, const <span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span> &<i>salt</i>, <span class="type">int</span> <i>iterations</i>, <span class="type"><a href="../qtcore/qtglobal.html#quint64-typedef">quint64</a></span> <i>dkLen</i>)</h3>
<p>Derive a key using the PBKDF2-algorithm as defined in <a href="https://tools.ietf.org/html/rfc8018#section-5.2">RFC 8018</a>.</p>
<p>This function takes the <i>data</i> and <i>salt</i>, and then applies HMAC-X, where the X is <i>algorithm</i>, repeatedly. It internally concatenates intermediate results to the final output until at least <i>dkLen</i> amount of bytes have been computed and it will execute HMAC-X <i>iterations</i> times each time a concatenation is required. The total number of times it will execute HMAC-X depends on <i>iterations</i>, <i>dkLen</i> and <i>algorithm</i> and can be calculated as <code>iterations * ceil(dkLen / QCryptographicHash::hashLength(algorithm))</code>.</p>
<p>This function was introduced in Qt 5.12.</p>
<p><b>See also </b><a href="qpassworddigestor.html#deriveKeyPbkdf1">deriveKeyPbkdf1</a>, <a href="../qtcore/qmessageauthenticationcode.html">QMessageAuthenticationCode</a>, and <a href="../qtcore/qcryptographichash.html">QCryptographicHash</a>.</p>
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