HTTP with Encryption and Signing (MIME Protocol)

Hi All,

I have a below requirement in project. Currently we are in PO 7.4

IDoc -- > SAP PI --> (via HTTPS SSL) BANK

I need to encrypt and Sign the Data and share it to Bank.

Protocol Used: S/MIME .. PGP Encryption/Decryption Module doesn't suit my requirement due to different protocol.

SOAP (HTTP)  --> Do not use soap envelope and MIME Protocol i could use , but i can't pass my HTTP Header. (any way we could pass more HTTP header in SOAP Protocol?)

Please share the approach to achieve the solution. if JAVA mapping kindly throw idea on S/MIME protocol JAVA mapping possibility?

Best Regards,

Suresh S