CMOD Rest APIs in OIC

Summary

Using CMOD rest api to download the documents from SAP

Content

Hi All,

We have a requirement to use CMOD Rest APIs to download the documents from SAP using OIC.
To access a CMOD Rest API, we need to pass Authorization as header. The Authorization contains access ID and signature. The signature is generated in the below way.

String Authorization = “CMODSharedKey” +” “ + AccessID + “:” + Signature;

Signature = Base64( (Hmac-SHA256 ( SecretKey, UTF-8-Enoded (StringToSign) );

StringToSign  = Method+ “\n” +
        Date + “\n” +
        URL + “\n” +
        Resource + “\n” +
        AccessID;

Is there a way to generate this signature in OIC using javascript functions?
Can anyone please help me if this is already implemented?