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)> 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