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.\" ========================================================================
.\"
.IX Title "EVP_BLAKE2B512 3"
.TH EVP_BLAKE2B512 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.if n .ad l
.nh
.SH "NAME"
EVP_blake2b512, EVP_blake2s256 \&\- BLAKE2 For EVP
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/evp.h>
\&
\& const EVP_MD *EVP_blake2b512(void);
\& const EVP_MD *EVP_blake2s256(void);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\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
\&\s-1RFC 7693.\s0
.IP "\fIEVP_blake2s256()\fR" 4
.IX Item "EVP_blake2s256()"
The BLAKE2s algorithm that produces a 256\-bit output from a given input.
.IP "\fIEVP_blake2b512()\fR" 4
.IX Item "EVP_blake2b512()"
The BLAKE2b algorithm that produces a 512\-bit output from a given input.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
These functions return a \fB\s-1EVP_MD\s0\fR structure that contains the
implementation of the symmetric cipher. See \fIEVP_MD_meth_new\fR\|(3) for
details of the \fB\s-1EVP_MD\s0\fR structure.
.SH "CONFORMING TO"
.IX Header "CONFORMING TO"
\&\s-1RFC 7693.\s0
.SH "NOTES"
.IX Header "NOTES"
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 "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIevp\fR\|(7),
\&\fIEVP_DigestInit\fR\|(3)
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2017 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L"License\*(R").  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
<https://www.openssl.org/source/license.html>.

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