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<title>EVP_MAC-BLAKE2</title>
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<ul id="index">
<li><a href="#NAME">NAME</a></li>
<li><a href="#DESCRIPTION">DESCRIPTION</a>
<ul>
<li><a href="#Identity">Identity</a></li>
<li><a href="#Supported-parameters">Supported parameters</a></li>
</ul>
</li>
<li><a href="#SEE-ALSO">SEE ALSO</a></li>
<li><a href="#HISTORY">HISTORY</a></li>
<li><a href="#COPYRIGHT">COPYRIGHT</a></li>
</ul>
<h1 id="NAME">NAME</h1>
<p>EVP_MAC-BLAKE2, EVP_MAC-BLAKE2BMAC, EVP_MAC-BLAKE2SMAC - The BLAKE2 EVP_MAC implementations</p>
<h1 id="DESCRIPTION">DESCRIPTION</h1>
<p>Support for computing BLAKE2 MACs through the <b>EVP_MAC</b> API.</p>
<h2 id="Identity">Identity</h2>
<p>These implementations are identified with one of these names and properties, to be used with EVP_MAC_fetch():</p>
<dl>
<dt id="BLAKE2BMAC-provider-default">"BLAKE2BMAC", "provider=default"</dt>
<dd>
</dd>
<dt id="BLAKE2SMAC-provider-default">"BLAKE2SMAC", "provider=default"</dt>
<dd>
</dd>
</dl>
<h2 id="Supported-parameters">Supported parameters</h2>
<p>The general description of these parameters can be found in <a href="../man3/EVP_MAC.html">"PARAMETERS" in EVP_MAC(3)</a>.</p>
<p>All these parameters can be set with EVP_MAC_CTX_set_params(). Furthermore, the "size" parameter can be retrieved with EVP_MAC_CTX_get_params(), or with EVP_MAC_CTX_get_mac_size(). The length of the "size" parameter should not exceed that of a <b>size_t</b>. Likewise, the "block-size" parameter can be retrieved with EVP_MAC_CTX_get_params(), or with EVP_MAC_CTX_get_block_size().</p>
<dl>
<dt id="key-OSSL_MAC_PARAM_KEY-octet-string">"key" (<b>OSSL_MAC_PARAM_KEY</b>) <octet string></dt>
<dd>
<p>Sets the MAC key. It may be at most 64 bytes for BLAKE2BMAC or 32 for BLAKE2SMAC and at least 1 byte in both cases. Setting this parameter is identical to passing a <i>key</i> to <a href="../man3/EVP_MAC_init.html">EVP_MAC_init(3)</a>.</p>
</dd>
<dt id="custom-OSSL_MAC_PARAM_CUSTOM-octet-string">"custom" (<b>OSSL_MAC_PARAM_CUSTOM</b>) <octet string></dt>
<dd>
<p>Sets the custom value. It is an optional value of at most 16 bytes for BLAKE2BMAC or 8 for BLAKE2SMAC, and is empty by default.</p>
</dd>
<dt id="salt-OSSL_MAC_PARAM_SALT-octet-string">"salt" (<b>OSSL_MAC_PARAM_SALT</b>) <octet string></dt>
<dd>
<p>Sets the salt. It is an optional value of at most 16 bytes for BLAKE2BMAC or 8 for BLAKE2SMAC, and is empty by default.</p>
</dd>
<dt id="size-OSSL_MAC_PARAM_SIZE-unsigned-integer">"size" (<b>OSSL_MAC_PARAM_SIZE</b>) <unsigned integer></dt>
<dd>
<p>Sets the MAC size. It can be any number between 1 and 32 for EVP_MAC_BLAKE2S or between 1 and 64 for EVP_MAC_BLAKE2B. It is 32 and 64 respectively by default.</p>
</dd>
<dt id="block-size-OSSL_MAC_PARAM_SIZE-unsigned-integer">"block-size" (<b>OSSL_MAC_PARAM_SIZE</b>) <unsigned integer></dt>
<dd>
<p>Gets the MAC block size. By default, it is 64 for EVP_MAC_BLAKE2S and 128 for EVP_MAC_BLAKE2B.</p>
</dd>
</dl>
<h1 id="SEE-ALSO">SEE ALSO</h1>
<p><a href="../man3/EVP_MAC_CTX_get_params.html">EVP_MAC_CTX_get_params(3)</a>, <a href="../man3/EVP_MAC_CTX_set_params.html">EVP_MAC_CTX_set_params(3)</a>, <a href="../man3/EVP_MAC.html">"PARAMETERS" in EVP_MAC(3)</a>, <a href="../man3/OSSL_PARAM.html">OSSL_PARAM(3)</a></p>
<h1 id="HISTORY">HISTORY</h1>
<p>The macros and functions described here were added to OpenSSL 3.0.</p>
<h1 id="COPYRIGHT">COPYRIGHT</h1>
<p>Copyright 2018-2021 The OpenSSL Project Authors. All Rights Reserved.</p>
<p>Licensed under the Apache License 2.0 (the "License"). 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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