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.IX Title &quot;EVP_BLAKE2B512 3&quot;
.TH EVP_BLAKE2B512 3 &quot;2023-09-11&quot; &quot;1.1.1w&quot; &quot;OpenSSL&quot;
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.SH &quot;NAME&quot;
EVP_blake2b512, EVP_blake2s256 \&amp;\- BLAKE2 For EVP
.SH &quot;SYNOPSIS&quot;
.IX Header &quot;SYNOPSIS&quot;
.Vb 1
\&amp; #include &lt;openssl/evp.h&gt;
\&amp;
\&amp; const EVP_MD *EVP_blake2b512(void);
\&amp; const EVP_MD *EVP_blake2s256(void);
.Ve
.SH &quot;DESCRIPTION&quot;
.IX Header &quot;DESCRIPTION&quot;
\&amp;\s-1BLAKE2\s0 is an improved version of \s-1BLAKE,\s0 which was submitted to the \s-1NIST SHA\-3\s0
algorithm competition. The BLAKE2s and BLAKE2b algorithms are described in
\&amp;\s-1RFC 7693.\s0
.IP &quot;\fBEVP_blake2s256()\fR&quot; 4
.IX Item &quot;EVP_blake2s256()&quot;
The BLAKE2s algorithm that produces a 256\-bit output from a given input.
.IP &quot;\fBEVP_blake2b512()\fR&quot; 4
.IX Item &quot;EVP_blake2b512()&quot;
The BLAKE2b algorithm that produces a 512\-bit output from a given input.
.SH &quot;RETURN VALUES&quot;
.IX Header &quot;RETURN VALUES&quot;
These functions return a \fB\s-1EVP_MD\s0\fR structure that contains the
implementation of the symmetric cipher. See \fBEVP_MD_meth_new\fR\|(3) for
details of the \fB\s-1EVP_MD\s0\fR structure.
.SH &quot;CONFORMING TO&quot;
.IX Header &quot;CONFORMING TO&quot;
\&amp;\s-1RFC 7693.\s0
.SH &quot;NOTES&quot;
.IX Header &quot;NOTES&quot;
While the BLAKE2b and BLAKE2s algorithms supports a variable length digest,
this implementation outputs a digest of a fixed length (the maximum length
supported), which is 512\-bits for BLAKE2b and 256\-bits for BLAKE2s.
.SH &quot;SEE ALSO&quot;
.IX Header &quot;SEE ALSO&quot;
\&amp;\fBevp\fR\|(7),
\&amp;\fBEVP_DigestInit\fR\|(3)
.SH &quot;COPYRIGHT&quot;
.IX Header &quot;COPYRIGHT&quot;
Copyright 2017 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L&quot;License\*(R&quot;).  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
&lt;https://www.openssl.org/source/license.html&gt;.
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