WS-Security and Forms PL/SQL

Oracle Database 10g Enterprise Edition Release 10.2.0.2.0 - Prod PL/SQL Release 10.2.0.2.0 - Production
Forms [32 Bit] Version 10.1.2.0.2 (Production)

Hello, 

I have an application in Forms (web mode). That application must now use a web service.
I therefore develop a procedure called this service and it works fine using HTTPS (Web Service Test on https).
The problem is that now I must touch on the same web service that has been secure with WS-Security.
How do I add headers security, sign the message ... .

All ideas are welcome.

Thank you beforehand.

For those interested, here's the code:
(Warning, this is only a test, no param, ... , but the ultimate goal is to call this procedure in Forms).