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 Apache License 2.0 (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