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EVP_BLAKE2B512(3ossl) OpenSSL EVP_BLAKE2B512(3ossl)
NAME
EVP_blake2b512, EVP_blake2s256 - BLAKE2 For EVP
SYNOPSIS
#include <openssl/evp.h>
const EVP_MD *EVP_blake2b512(void);
const EVP_MD *EVP_blake2s256(void);
DESCRIPTION
BLAKE2 is an improved version of BLAKE, which was submitted to the NIST
SHA-3 algorithm competition. The BLAKE2s and BLAKE2b algorithms are
described in RFC 7693.
EVP_blake2s256()
The BLAKE2s algorithm that produces a 256-bit output from a given
input.
EVP_blake2b512()
The BLAKE2b algorithm that produces a 512-bit output from a given
input.
NOTES
Developers should be aware of the negative performance implications of
calling these functions multiple times and should consider using
EVP_MD_fetch(3) instead. See "Performance" in crypto(7) for further
information.
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.
RETURN VALUES
These functions return a EVP_MD structure that contains the
implementation of the message digest. See EVP_MD_meth_new(3) for
details of the EVP_MD structure.
CONFORMING TO
RFC 7693.
SEE ALSO
evp(7), EVP_DigestInit(3)
COPYRIGHT
Copyright 2017-2023 The OpenSSL Project Authors. All Rights Reserved.
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
<https://www.openssl.org/source/license.html>.
3.0.11 2023-09-19 EVP_BLAKE2B512(3ossl)