1=pod 2 3=head1 NAME 4 5EVP_md5, 6EVP_md5_sha1 7- MD5 For EVP 8 9=head1 SYNOPSIS 10 11 #include <openssl/evp.h> 12 13 const EVP_MD *EVP_md5(void); 14 const EVP_MD *EVP_md5_sha1(void); 15 16=head1 DESCRIPTION 17 18MD5 is a cryptographic hash function standardized in RFC 1321 and designed by 19Ronald Rivest. 20 21The CMU Software Engineering Institute considers MD5 unsuitable for further 22use since its security has been severely compromised. 23 24=over 4 25 26=item EVP_md5() 27 28The MD5 algorithm which produces a 128-bit output from a given input. 29 30=item EVP_md5_sha1() 31 32A hash algorithm of SSL v3 that combines MD5 with SHA-1 as described in RFC 336101. 34 35WARNING: this algorithm is not intended for non-SSL usage. 36 37=back 38 39=head1 NOTES 40 41Developers should be aware of the negative performance implications of 42calling these functions multiple times and should consider using 43L<EVP_MD_fetch(3)> with L<EVP_MD-MD5(7)> or L<EVP_MD-MD5-SHA1(7)> instead. 44See L<crypto(7)/Performance> for further information. 45 46=head1 RETURN VALUES 47 48These functions return a B<EVP_MD> structure that contains the 49implementation of the message digest. See L<EVP_MD_meth_new(3)> for 50details of the B<EVP_MD> structure. 51 52=head1 CONFORMING TO 53 54IETF RFC 1321. 55 56=head1 SEE ALSO 57 58L<evp(7)>, 59L<EVP_DigestInit(3)> 60 61=head1 COPYRIGHT 62 63Copyright 2017-2023 The OpenSSL Project Authors. All Rights Reserved. 64 65Licensed under the Apache License 2.0 (the "License"). You may not use 66this file except in compliance with the License. You can obtain a copy 67in the file LICENSE in the source distribution or at 68L<https://www.openssl.org/source/license.html>. 69 70=cut 71 72