Alternative RSA key derivation methods

[darconeous]

I'm fairly confident that the existing RSA key generation code works pretty well and is secure, but it will take a very long time to execute from a constrained environment like a smart card. We may want to consider adding one or more additional flavors for RSA key derivation that allow for better performance on constrained platforms.

Some areas of research:

1. Faster random-prime derivation, such as described in this paper.
2. Multi-Prime RSA would allow for smaller primes to be used, which would be faster to calculate.