EDI - Digital Signature & Encryption (EDI-INT S/MIME)

Question

Colleagues,
I need to transmit a formatted text file to a government agency using HTTP protocol (SMTP is not permitted) and for the life of me I cannot get this to work ... I can transmit fine but their server cannot decrypt my files. I must use multipart/signed with a syntax similar to this:
Content-type: multipart/signed;
protocol="application/pkcs7-signature";
micalg=<hash symbol>;
boundary="---------------------------9723347566394"
---------------------------9723347566394
Content-Type: Application/edi-consent
+<Formatted Text File/Object>+
-----------------------------9723347566394
Content-Type: application/pkcs7-signature
Cryptographic signature of EDI Object and associated headers+
-----------------------------9723347566394--
I need to digitally sign the Format Text/Object with PKCS#7 and put the output of that in the section of "*Cryptographic signature of EDI Object and associated headers*". How can I do that? Digitally Sign the file and then open it in a text editor and cut and paste the ASCII text?
Once I populate "*Cryptographic signature of EDI Object and associated headers*", I am then suppose the encrypt the whole file (headers and message body parts one & two) and then send it off via HTTP .
Can anyone point me to a working example of this? Or shed some light on how to accomplish this. The technical document that they gave me is useless.
Thanks in advance

Answer 1

yvrMarc wrote:
Thanks for your reply ... here is the technical document - starting at page 30
[http://www.cbsa-asfc.gc.ca/eservices/cig-pid/cig-pid-eng.pdf]
Sorry but I can't help. Though I could be wrong, this looks to be far too big a task to be handled through a forum. I think you need to hire a local consultant who has dealt with this gateway before.
Since it contains a load of code to help with SMIME and PKCS7, a resource that might be useful to you is [http://www.bouncycastle.org/|http://www.bouncycastle.org/].
Best of luck.