Password Digest to call SOAP Service

Hi All,

Has anyone implemented on how to create a Password digest in Appian to call a SOAP service which requires this in header.

I am looking for to know that how we can generate nonce,created and how we can convert it to base64 and sha 1.

I have seen somewhere that Appian supports it ,but how do we implement it?

Any information will be helpful.

Thanks,

Gaurav