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  <div class="section" id="exceptions">
<h1>Exceptions<a class="headerlink" href="#exceptions" title="Permalink to this headline"></a></h1>
<dl class="class">
<dt id="cryptography.exceptions.UnsupportedAlgorithm">
<em class="property">class </em><code class="descclassname">cryptography.exceptions.</code><code class="descname">UnsupportedAlgorithm</code><a class="headerlink" href="#cryptography.exceptions.UnsupportedAlgorithm" title="Permalink to this definition"></a></dt>
<dd><p>Raised when the requested algorithm, or combination of algorithms is not
supported.</p>
</dd></dl>

<dl class="class">
<dt id="cryptography.exceptions.AlreadyFinalized">
<em class="property">class </em><code class="descclassname">cryptography.exceptions.</code><code class="descname">AlreadyFinalized</code><a class="headerlink" href="#cryptography.exceptions.AlreadyFinalized" title="Permalink to this definition"></a></dt>
<dd><p>This is raised when a context is used after being finalized.</p>
</dd></dl>

<dl class="class">
<dt id="cryptography.exceptions.InvalidSignature">
<em class="property">class </em><code class="descclassname">cryptography.exceptions.</code><code class="descname">InvalidSignature</code><a class="headerlink" href="#cryptography.exceptions.InvalidSignature" title="Permalink to this definition"></a></dt>
<dd><p>This is raised when signature verification fails. This can occur with
HMAC or asymmetric key signature validation.</p>
</dd></dl>

<dl class="class">
<dt id="cryptography.exceptions.NotYetFinalized">
<em class="property">class </em><code class="descclassname">cryptography.exceptions.</code><code class="descname">NotYetFinalized</code><a class="headerlink" href="#cryptography.exceptions.NotYetFinalized" title="Permalink to this definition"></a></dt>
<dd><p>This is raised when the AEAD tag property is accessed on a context
before it is finalized.</p>
</dd></dl>

<dl class="class">
<dt id="cryptography.exceptions.AlreadyUpdated">
<em class="property">class </em><code class="descclassname">cryptography.exceptions.</code><code class="descname">AlreadyUpdated</code><a class="headerlink" href="#cryptography.exceptions.AlreadyUpdated" title="Permalink to this definition"></a></dt>
<dd><p>This is raised when additional data is added to a context after update
has already been called.</p>
</dd></dl>

<dl class="class">
<dt id="cryptography.exceptions.InvalidKey">
<em class="property">class </em><code class="descclassname">cryptography.exceptions.</code><code class="descname">InvalidKey</code><a class="headerlink" href="#cryptography.exceptions.InvalidKey" title="Permalink to this definition"></a></dt>
<dd><p>This is raised when the verify method of a key derivation function's
computed key does not match the expected key.</p>
</dd></dl>

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