There are many special considerations.  The OS/400 operating system is a
decent modern OS and is being enhanced actively.   For smaller shops who
had System/36 and 38, AS400 is a logical new generation environment. 

We were faced with this same challenge recently. There is no port of the
OpenSSL libraries for the native AS400 environment, but the i/Series
hardware and OS/400 now support the execution of AIX binaries in the
Portable Application Software Environment (PASE) subsystem. Both PASE
applications and native AS400 apps can use a Unix file system on the
machine. 

IBM has made OpenSSH and OpenSSL (0.9.7d) available, but these are
PASE-based, not native OS/400 executables and libraries. They are
compiled and linked on AIX and copied into the PASE environment.  

There are facilities to mix native and PASE applications and libraries.
I believe it is "possible" with some experimentation to have an AS400
application load and call the crypto and ssl libraries.   There will be
a lot of discovery in such an experiment, but it would add value to your
product if you could do it. 

I can give you some more pointers offline. I'm no AS400 expert, merely
armed and dangerous. 


Dave McLellan - Common Management Group Engineering
EMC Corporation
228 South St. 
Hopkinton MA 01748
phone: 508-249-1257
fax 508-497-8030

-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Mark
Sent: Tuesday, September 26, 2006 4:17 AM
To: openssl-users@openssl.org
Subject: OpenSSL on AS400

Hi All,

We have a client running on AS400 which communicates over tcp/ip that
requires to connects to our server via SSL.  I really know almost
nothing about AS400.  Does OpenSSL work on AS400?  Are there any
special considerations for this platform?

Thanks,
Mark
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