1=pod 2 3=head1 NAME 4 5EVP_blake2b512, 6EVP_blake2s256 7- BLAKE2 For EVP 8 9=head1 SYNOPSIS 10 11 #include <openssl/evp.h> 12 13 const EVP_MD *EVP_blake2b512(void); 14 const EVP_MD *EVP_blake2s256(void); 15 16=head1 DESCRIPTION 17 18BLAKE2 is an improved version of BLAKE, which was submitted to the NIST SHA-3 19algorithm competition. The BLAKE2s and BLAKE2b algorithms are described in 20RFC 7693. 21 22=over 4 23 24=item EVP_blake2s256() 25 26The BLAKE2s algorithm that produces a 256-bit output from a given input. 27 28=item EVP_blake2b512() 29 30The BLAKE2b algorithm that produces a 512-bit output from a given input. 31 32=back 33 34=head1 RETURN VALUES 35 36These functions return a B<EVP_MD> structure that contains the 37implementation of the symmetric cipher. See L<EVP_MD_meth_new(3)> for 38details of the B<EVP_MD> structure. 39 40=head1 CONFORMING TO 41 42RFC 7693. 43 44=head1 NOTES 45 46While the BLAKE2b and BLAKE2s algorithms supports a variable length digest, 47this implementation outputs a digest of a fixed length (the maximum length 48supported), which is 512-bits for BLAKE2b and 256-bits for BLAKE2s. 49 50=head1 SEE ALSO 51 52L<evp(7)>, 53L<EVP_DigestInit(3)> 54 55=head1 COPYRIGHT 56 57Copyright 2017 The OpenSSL Project Authors. All Rights Reserved. 58 59Licensed under the OpenSSL license (the "License"). You may not use 60this file except in compliance with the License. You can obtain a copy 61in the file LICENSE in the source distribution or at 62L<https://www.openssl.org/source/license.html>. 63 64=cut 65 66