Starting with the new [em]Mountaineer 4.3.1 Beta 2[/em] release announced yesterday (https://www.ghielectronics.com/community/forum/topic?id=15284&page=1#msg153347), the Mountaineer firmware supports the hardware random number generators built into STM32 microcontrollers.
The API is a tiny but true subset of the full .NET framework’s [em]System.Security.Cryptography[/em] API.
More information here:
http://www.mountaineer.org/resources/tidbits/using-the-hardware-random-number-generator/