c# - Is there any way to get System.Security.Cryptography work on Windows Phone 8 to generate random numbers?

Question

Is there any way to get the classes System.Security.Cryptography.RandomNumberGenerator or System.Security.Cryptography.RNGCryptoServiceProvider work on a Portable Class Library targeting Windows Phone 8 and Windows Store App?

The main reason for that is that I'm trying to get a "true" random value and the Random class is useless for my purposes.

I've heard about the PclContrib that "emulates" the System.Security.Cryptography for PCL project on Codeplex but I think it doesn't have the functionality I need.