Create a client to call API WSDL

Hi, I have a coldfusion application which needs to be interfaced with a WSDL. Catch is that the request should be signed by a digital certificate installed on my server. It's a WS security model. I can provide you with settings for SOAPUi to successfully call the webservice. Need to emulate the same from coldfusion. Please bid only if you have done this before because it cannot be done by a newbie.