EVP_blake2b512, EVP_blake2s256 - BLAKE2 For EVP
 #include <openssl/evp.h>
 const EVP_MD *EVP_blake2b512(void);
 const EVP_MD *EVP_blake2s256(void);
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.
These functions return a EVP_MD structure that contains the
  implementation of the symmetric cipher. See EVP_MD_meth_new(3) for
  details of the EVP_MD structure.
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.
evp(7), EVP_DigestInit(3)
Copyright 2017 The OpenSSL Project Authors. All Rights Reserved.Licensed under the OpenSSL license (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>.