How to check SAP User/Password from a third party with a RFC ? (Encrypted)

Hi,

I made a RFC to check user/password in R/3. It has two input parameters

IV_USER

IV_PASSWORD

Example:

IV_USER = ROBERTW

IV_PASSWORD = bed123

I'm using function SUSR_LOGIN_CHECK_RFC and it work's fine.

The RFC is called from an external third party device via SAP PI. The third party asks for the user and password and then calls the RFC to check is the values are correct.

Here is the thing. The password isn't encrypted. I want to send the password encrypted, but I don't know how to check if it's the correct password.

Any ideas ?