Invoke REST API with signed request query string using HMAC

I am trying to build a REST client to Amazon MWS APIs and running into trouble with signing the query string for a REST request. From Amazon MWS documentation, http://docs.developer.amazonservices.com/en_US/dev_guide/DG_ClientLibrar..., clients are required to sign the API requests using HMAC hash algorithm such as HmacSHA256.

Is there any out-of-box support for this in BW6?

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