xref: /freebsd/crypto/openssl/doc/man3/EVP_mdc2.pod (revision ad991e4c142ebabad7aef488ad97b189ecabb270)

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=head1 NAME

EVP_mdc2
- MDC-2 For EVP

=head1 SYNOPSIS

 #include <openssl/evp.h>

 const EVP_MD *EVP_mdc2(void);

=head1 DESCRIPTION

MDC-2 (Modification Detection Code 2 or Meyer-Schilling) is a cryptographic
hash function based on a block cipher. This implementation is only available
with the legacy provider.

=over 4

=item EVP_mdc2()

The MDC-2DES algorithm of using MDC-2 with the DES block cipher. It produces a
128-bit output from a given input.

=back

=head1 NOTES

Developers should be aware of the negative performance implications of
calling this function multiple times and should consider using
L<EVP_MD_fetch(3)> with L<EVP_MD-MDC2(7)> instead.
See L<crypto(7)/Performance> for further information.

=head1 RETURN VALUES

These functions return a B<EVP_MD> structure that contains the
implementation of the message digest. See L<EVP_MD_meth_new(3)> for
details of the B<EVP_MD> structure.

=head1 CONFORMING TO

ISO/IEC 10118-2:2000 Hash-Function 2, with DES as the underlying block cipher.

=head1 SEE ALSO

L<evp(7)>,
L<provider(7)>,
L<EVP_DigestInit(3)>

=head1 COPYRIGHT

Copyright 2017-2023 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (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
L<https://www.openssl.org/source/license.html>.

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