xref: /openssl/doc/man3/EVP_mdc2.pod (revision b6eb95fa)
1=pod
2
3=head1 NAME
4
5EVP_mdc2
6- MDC-2 For EVP
7
8=head1 SYNOPSIS
9
10 #include <openssl/evp.h>
11
12 const EVP_MD *EVP_mdc2(void);
13
14=head1 DESCRIPTION
15
16MDC-2 (Modification Detection Code 2 or Meyer-Schilling) is a cryptographic
17hash function based on a block cipher. This implementation is only available
18with the legacy provider.
19
20=over 4
21
22=item EVP_mdc2()
23
24The MDC-2DES algorithm of using MDC-2 with the DES block cipher. It produces a
25128-bit output from a given input.
26
27=back
28
29=head1 NOTES
30
31Developers should be aware of the negative performance implications of
32calling this function multiple times and should consider using
33L<EVP_MD_fetch(3)> with L<EVP_MD-MDC2(7)> instead.
34See L<crypto(7)/Performance> for further information.
35
36=head1 RETURN VALUES
37
38These functions return a B<EVP_MD> structure that contains the
39implementation of the message digest. See L<EVP_MD_meth_new(3)> for
40details of the B<EVP_MD> structure.
41
42=head1 CONFORMING TO
43
44ISO/IEC 10118-2:2000 Hash-Function 2, with DES as the underlying block cipher.
45
46=head1 SEE ALSO
47
48L<evp(7)>,
49L<provider(7)>,
50L<EVP_DigestInit(3)>
51
52=head1 COPYRIGHT
53
54Copyright 2017-2023 The OpenSSL Project Authors. All Rights Reserved.
55
56Licensed under the Apache License 2.0 (the "License").  You may not use
57this file except in compliance with the License.  You can obtain a copy
58in the file LICENSE in the source distribution or at
59L<https://www.openssl.org/source/license.html>.
60
61=cut
62
63