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) with  EVP_MD-BLAKE2(7)  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>.

3.0.13                                             2025-02-05                               EVP_BLAKE2B512(3SSL)