[PATCH] Optimized assembler version of md5_process() for x86-64

[Wayne Davison]

On Sat, May 23, 2020 at 4:37 AM Sebastian Andrzej Siewior <
rsync at ml.breakpoint.cc> wrote:

> Wouldn't it be better to add support for a crypto library (like openssl)
> which would provide optimized algorithms for more than just one platform
> without the need to maintain it separately?
>

Adding optional support for openssl's crypto library is also a good idea.
I've made rsync's MD5 code able to support using either the crypto library
or the rsync-included MD5 code.  I did not bother to try to support it for
MD4 checksums, since those are mostly historical & there are some weird
exceptions for really old rsync compatibility that would need to be worked
out.  However, I might make it where the main MD4 checksum is covered by
openssl and just the historical ones get the historical code.

I've also added a comment to the checksum.c file about my support of being
able to distribute a dynamically linked version of rsync that links with
the openssl and xxhash libraries (since they are both BSD 2-clause
licensed), especially since this should (IMO) be considered to be covered
under the System Libraries part of the GPL.

..wayne..
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