Call an Non-SharePoint Secured RESTful API from a Workflow in a SharePoint Online Tenant

I have a scenario where I need to be able to make calls to a secured web service from a SharePoint 2013 workflow that will be deployed in a SharePoint Online (Office 365) environment. It is a REST web service that is secured in a 2-legged OAuth-like manner
(the service expects a hash of the data being sent that can then be validated on the service's end of the communication). The problem is, I can't figure out how I can hash the data, since I can't run any server-side code in the SharePoint Online environment.
The way I figured this should work is 1) user creates an item in a List on the SharePoint Site, which kicks off the workflow process. 2) the workflow process takes the user data and hashes it using a client secret assigned by the web service. 3) the
workflow creates a web request to the web service, passing the data and the hashed values. 4) the web service processes the input and returns. 5) the workflow continues to the next step.
I can't figure out how to implement step 2 in that process. I thought I could do a custom workflow activity that would accomplish it, but since it would pretty much have to be a code-based activity (i.e., not declarative), it can't be deployed in SharePoint
Online, according to the domentation I've found. I could potentially add a third layer in the process and have an auto-hosted app that I could call to do the hashing of the data, but that seems to defeat the purpose somewhat from a security perspective.
Has anyone else run into this kind of scenario? Doing this in an on-premesis environment would be easy, but that's not really an option.
Thanks!

You should implement this by passing the values to a public (forms based auth) web method (secure over SSL) that does the hash for you and returns the value to your workflow so that it can pass it on to the other service.
Chris Givens CEO, Architecting Connected Systems
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