Re: MD5 and RPG or...?

[Bryan Dietz <BDietz@xxxxxxxxxx>]

With the new FREE product  5733-SC1 -- IBM Portable Utilities for i5/OS
http://www-1.ibm.com/servers/enable/site/porting/tools/openssh.html

You get:
openssh-3.5p1
openssl-0.9.7d
zlib-1.1.4

So no need to port it.  IBM already did.


----------------------------
Bryan Dietz

Aktion Associates
midrange-l-bounces@xxxxxxxxxxxx wrote on 04/01/2005 01:38:50 AM:

> > Also, Perl/php, Linux, various *nixes and who knows what else have
> > md5sum and other commands or utilities.
>
> FreeBSD's is called "md5" (no "sum" at the end).  Also, the OpenSSL
> command-line tool can calculate MD5 checksums with:
>
> $ openssl md5 < myfile.csv
> 169fec5e6a5056dd0a2f5bd6adc1f252
>
> > Under OS/400, we primarily have CIPHER or the _CIPHER builtin. But I'm
> > unclear about CIPHER (and probably MD5 to boot). It seems that the
> > maximum string length would be 16MB since a pointer is input to the
> > function. Some process for handling a document (streamfile) >16MB would

> > seem to require a chaining from segment to segment or something like
> > that.
>
> Well, you don't have to do the whole thing in one string!  The _CIPHER
> builtin has the capability of specifying a "start" "middle" and "end"
> block so that you can keep feeding the data to it in chunks.
>
> I've written MD5 utilities in RPG using _CIPHER that work just like the
> ones in Linux, BSD, etc. I've always thought it was wonderful to be able
> to download a file and compare the MD5 checksum on the server with what
> the client received.
>
> But for some reason, whenever I talk to anyone else about this they think

> I'm crazy and prefer to compare the byte count instead of making a
> checksum. I'm glad to hear that there are others that can see the value!
>
> > A google over AIX and MD5 left me with a sea of references that will
> > take a month to go through to see if PASE might help. QShell didn't
have
> > anything that jumped out at me.
>
> I'm told that OpenSSL can be made to run in PASE. (Though, I don't know
if
> it requires V5R3 or if it works on earlier releases)  If so, that'll be
> able to do an MD5 checksum as described above.
>
> > Is there any material on how to handle >16MB documents under OS/400?
>
> Like I said, this isn't necessary. It's far more efficient to process the

> data in chunks rather than load the whole thing into memory at once.
>
> (shrug) Maybe if you bug me enough, I'll write one and put it up on my
web
> site. :)