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 NOTES
35
36Developers should be aware of the negative performance implications of
37calling these functions multiple times and should consider using
38L<EVP_MD_fetch(3)> with L<EVP_MD-BLAKE2(7)> instead.
39See L<crypto(7)/Performance> for further information.
40
41While the BLAKE2b and BLAKE2s algorithms supports a variable length digest,
42this implementation outputs a digest of a fixed length (the maximum length
43supported), which is 512-bits for BLAKE2b and 256-bits for BLAKE2s.
44
45=head1 RETURN VALUES
46
47These functions return a B<EVP_MD> structure that contains the
48implementation of the message digest. See L<EVP_MD_meth_new(3)> for
49details of the B<EVP_MD> structure.
50
51=head1 CONFORMING TO
52
53RFC 7693.
54
55=head1 SEE ALSO
56
57L<evp(7)>,
58L<EVP_DigestInit(3)>
59
60=head1 COPYRIGHT
61
62Copyright 2017-2023 The OpenSSL Project Authors. All Rights Reserved.
63
64Licensed under the Apache License 2.0 (the "License").  You may not use
65this file except in compliance with the License.  You can obtain a copy
66in the file LICENSE in the source distribution or at
67L<https://www.openssl.org/source/license.html>.
68
69=cut
70
71