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<ul id="index">
  <li><a href="#NAME">NAME</a></li>
  <li><a href="#DESCRIPTION">DESCRIPTION</a>
    <ul>
      <li><a href="#Algorithm-Name">Algorithm Name</a></li>
      <li><a href="#Parameters">Parameters</a>
        <ul>
          <li><a href="#Gettable-EVP_CIPHER-parameters">Gettable EVP_CIPHER parameters</a></li>
          <li><a href="#Gettable-EVP_CIPHER_CTX-parameters">Gettable EVP_CIPHER_CTX parameters</a></li>
          <li><a href="#Settable-EVP_CIPHER_CTX-parameters">Settable EVP_CIPHER_CTX parameters</a></li>
        </ul>
      </li>
    </ul>
  </li>
  <li><a href="#CONFORMING-TO">CONFORMING TO</a></li>
  <li><a href="#SEE-ALSO">SEE ALSO</a></li>
  <li><a href="#COPYRIGHT">COPYRIGHT</a></li>
</ul>

<h1 id="NAME">NAME</h1>

<p>EVP_CIPHER-NULL - The NULL EVP_CIPHER implementation</p>

<h1 id="DESCRIPTION">DESCRIPTION</h1>

<p>Support for a NULL symmetric encryption using the <b>EVP_CIPHER</b> API. This is used when the TLS cipher suite is TLS_NULL_WITH_NULL_NULL. This does no encryption (just copies the data) and has a mac size of zero.</p>

<h2 id="Algorithm-Name">Algorithm Name</h2>

<p>The following algorithm is available in the default provider:</p>

<dl>

<dt id="NULL">&quot;NULL&quot;</dt>
<dd>

</dd>
</dl>

<h2 id="Parameters">Parameters</h2>

<p>This implementation supports the following parameters:</p>

<h3 id="Gettable-EVP_CIPHER-parameters">Gettable EVP_CIPHER parameters</h3>

<p>See <a href="../man3/EVP_EncryptInit.html">&quot;Gettable EVP_CIPHER parameters&quot; in EVP_EncryptInit(3)</a></p>

<h3 id="Gettable-EVP_CIPHER_CTX-parameters">Gettable EVP_CIPHER_CTX parameters</h3>

<dl>

<dt id="keylen-OSSL_CIPHER_PARAM_KEYLEN-unsigned-integer">&quot;keylen&quot; (<b>OSSL_CIPHER_PARAM_KEYLEN</b>) &lt;unsigned integer&gt;</dt>
<dd>

</dd>
<dt id="ivlen-OSSL_CIPHER_PARAM_IVLEN-and-OSSL_CIPHER_PARAM_AEAD_IVLEN-unsigned-integer">&quot;ivlen&quot; (<b>OSSL_CIPHER_PARAM_IVLEN</b> and &lt;<b>OSSL_CIPHER_PARAM_AEAD_IVLEN</b>) &lt;unsigned integer&gt;</dt>
<dd>

</dd>
<dt id="tls-mac-OSSL_CIPHER_PARAM_TLS_MAC-octet-ptr">&quot;tls-mac&quot; (<b>OSSL_CIPHER_PARAM_TLS_MAC</b>) &lt;octet ptr&gt;</dt>
<dd>

</dd>
</dl>

<p>See <a href="../man3/EVP_EncryptInit.html">&quot;PARAMETERS&quot; in EVP_EncryptInit(3)</a> for further information.</p>

<h3 id="Settable-EVP_CIPHER_CTX-parameters">Settable EVP_CIPHER_CTX parameters</h3>

<dl>

<dt id="tls-mac-size-OSSL_CIPHER_PARAM_TLS_MAC_SIZE-unsigned-integer">&quot;tls-mac-size&quot; (<b>OSSL_CIPHER_PARAM_TLS_MAC_SIZE</b>) &lt;unsigned integer&gt;</dt>
<dd>

</dd>
</dl>

<p>See <a href="../man3/EVP_EncryptInit.html">&quot;PARAMETERS&quot; in EVP_EncryptInit(3)</a> for further information.</p>

<h1 id="CONFORMING-TO">CONFORMING TO</h1>

<p>RFC 5246 section-6.2.3.1</p>

<h1 id="SEE-ALSO">SEE ALSO</h1>

<p><a href="../man7/provider-cipher.html">provider-cipher(7)</a>, <a href="../man7/OSSL_PROVIDER-default.html">OSSL_PROVIDER-default(7)</a></p>

<h1 id="COPYRIGHT">COPYRIGHT</h1>

<p>Copyright 2023 The OpenSSL Project Authors. All Rights Reserved.</p>

<p>Licensed under the Apache License 2.0 (the &quot;License&quot;). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p>


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