RNG_DEVICE Environment Variable?

>Considering a couple of RNG hardware manufacturers use different 
>names for device interfaces, perhaps it would be 'convenient' to 
>have apps look for the environment variable RNG_DEVICE which gives 
>the name of whatever device is used (rnadom$, random, rand, even 
>lpt2...) or even a special file that is mixed periodically by a cron 
>job (noiz.c?).

>The assumption is that reads from that device would return "truly 
>random" bytes (not from a pseudo-RNG), either from specialized 
>hardware or a system-noise sampler such as noise.sys (DOS) or 
>random.c (Linux, FreeBSD).

>How software would handle not getting enough bytes is another matter, >
>perhaps left configurable to the app.
>
>Rob. 

My hack to PGP to support RNG uses the varriable RNGDRIVER,
but is in config.txt, not the environment.