NAME

       EVP_md5, EVP_md5_sha1 - MD5 For EVP

SYNOPSIS

        #include <openssl/evp.h>

        const EVP_MD *EVP_md5(void);
        const EVP_MD *EVP_md5_sha1(void);

DESCRIPTION

       MD5 is a cryptographic hash function standardized in RFC 1321 and designed by Ronald Rivest.

       The CMU Software Engineering Institute considers MD5 unsuitable for further use since its security has
       been severely compromised.

       EVP_md5()
           The MD5 algorithm which produces a 128-bit output from a given input.

       EVP_md5_sha1()
           A hash algorithm of SSL v3 that combines MD5 with SHA-1 as described in RFC 6101.

           WARNING: this algorithm is not intended for non-SSL usage.

NOTES

       Developers  should  be aware of the negative performance implications of calling these functions multiple
       times and should consider using EVP_MD_fetch(3) with EVP_MD-MD5(7) or  EVP_MD-MD5-SHA1(7)  instead.   See
       "Performance" in crypto(7) for further information.

RETURN VALUES

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

CONFORMING TO

       IETF RFC 1321.

SEE ALSO

       evp(7), EVP_DigestInit(3)

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
       <https://www.openssl.org/source/license.html>.

3.4.1                                              2025-04-03                                      EVP_MD5(3SSL)