openssl-prebuild/linux_amd64/share/doc/openssl/html/man7/EVP_MAC-GMAC.html

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<title>EVP_MAC-GMAC</title>
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<li><a href="#name">NAME</a></li>
<li><a href="#description">DESCRIPTION</a></li>
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<li><a href="#identity">Identity</a></li>
<li><a href="#supported_parameters">Supported parameters</a></li>
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<li><a href="#see_also">SEE ALSO</a></li>
<li><a href="#copyright">COPYRIGHT</a></li>
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<h1><a name="name">NAME</a></h1>
<p>EVP_MAC-GMAC - The GMAC EVP_MAC implementation</p>
<p>
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<h1><a name="description">DESCRIPTION</a></h1>
<p>Support for computing GMAC MACs through the <strong>EVP_MAC</strong> API.</p>
<p>
</p>
<h2><a name="identity">Identity</a></h2>
<p>This implementation is identified with this name and properties, to be
used with EVP_MAC_fetch():</p>
<dl>
<dt><strong><a name="gmac_provider_default_or_provider_fips" class="item">&quot;GMAC&quot;, &quot;provider=default&quot; or &quot;provider=fips&quot;</a></strong></dt>
</dl>
<p>
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<h2><a name="supported_parameters">Supported parameters</a></h2>
<p>The general description of these parameters can be found in
<em>EVP_MAC(3)/PARAMETERS</em>.</p>
<p>The following parameter can be set with EVP_MAC_CTX_set_params():</p>
<dl>
<dt><strong><a name="key_ossl_mac_param_key_octet_string" class="item">&quot;key&quot; (<strong>OSSL_MAC_PARAM_KEY</strong>) &lt;octet string&gt;</a></strong></dt>
<dt><strong><a name="iv_ossl_mac_param_iv_octet_string" class="item">&quot;iv&quot; (<strong>OSSL_MAC_PARAM_IV</strong>) &lt;octet string&gt;</a></strong></dt>
<dt><strong><a name="cipher_ossl_mac_param_cipher_utf8_string" class="item">&quot;cipher&quot; (<strong>OSSL_MAC_PARAM_CIPHER</strong>) &lt;UTF8 string&gt;</a></strong></dt>
<dt><strong><a name="properties_ossl_mac_param_properties_utf8_string" class="item">&quot;properties&quot; (<strong>OSSL_MAC_PARAM_PROPERTIES</strong>) &lt;UTF8 string&gt;</a></strong></dt>
</dl>
<p>The following parameters can be retrieved with
EVP_MAC_CTX_get_params():</p>
<dl>
<dt><strong><a name="size_ossl_mac_param_size_unsigned_integer" class="item">&quot;size&quot; (<strong>OSSL_MAC_PARAM_SIZE</strong>) &lt;unsigned integer&gt;</a></strong></dt>
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<p>The &quot;size&quot; parameter can also be retrieved with <code>EVP_MAC_size()</code>.
The length of the &quot;size&quot; parameter is equal to that of an <strong>unsigned int</strong>.</p>
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</p>
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<h1><a name="see_also">SEE ALSO</a></h1>
<p><em>EVP_MAC_CTX_get_params(3)</em>, <em>EVP_MAC_CTX_set_params(3)</em>,
<em>EVP_MAC(3)/PARAMETERS</em>, <em>OSSL_PARAM(3)</em></p>
<p>
</p>
<hr />
<h1><a name="copyright">COPYRIGHT</a></h1>
<p>Copyright 2018-2019 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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