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EVP_blake2b512(3)                   OpenSSL                  EVP_blake2b512(3)


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.

       Both algorithms support a variable-length digest, but this is only
       available through EVP_MD-BLAKE2(7).

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>.

3.5.1                             2025-07-01                 EVP_blake2b512(3)