Can anyone help me with unix data encryption ?

From: Graham (alcina@supanet.com)
Date: 07/26/02 

From: "Graham" <alcina@supanet.com>
Date: Fri, 26 Jul 2002 20:31:26 +0100

I'm an application programmer. I've been given project to link my company's
product to another over a network. I've got to send messages in an XML
format, which doesn't look to be a problem, but I've got to use 3-DES
encryption. The host OS is UNIX. The application language is Mumps / M /
M-technology / CACHE without the new webby bits.
I don't even know unix !!! All this is new to me and as usual there's no
learning curve built into the project budget.
I can create the XML tags with the embedded data without any problem. I can
find someone who can send these messages down a port / socket. I'm
struggling to get a handle on the encryption side.
So far I think I've nailed that
- DES is a US data encryption standard.
- 3-DES is the same as triple DES
- This means the encryption uses 3 x 56 bit keys

I thought I could use the unix crypt command but the site's unix says it's
only got crypt(1) and not crypt(3). I can't change this 'coz a number of
producta, including our own, use crypt for password authentication.

I need to know
- where to get some software that will encrypt to this standard
- how to call it from an application program
- how to receive & decrypt the replies

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