md5 | MD5 C class convert from Frank Thilo

md5 is a C++ library. md5 has no bugs, it has no vulnerabilities and it has low support. However md5 has a Non-SPDX License. You can download it from GitHub.

converted to C++ class by Frank Thilo (thilo@unix-ag.org) for bzflag (md5.h and md5.c reference implementation of RFC 1321. Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All rights reserved. License to copy and use this software is granted provided that it is identified as the "RSA Data Security, Inc. MD5 Message-Digest Algorithm" in all material mentioning or referencing this software or this function. License is also granted to make and use derivative works provided that such works are identified as "derived from the RSA Data Security, Inc. MD5 Message-Digest Algorithm" in all material mentioning or referencing the derived work. RSA Data Security, Inc. makes no representations concerning either the merchantability of this software or the suitability of this software for any particular purpose. It is provided "as is" without express or implied warranty of any kind. These notices must be retained in any copies of any part of this documentation and/or software.