Speedup process using GPU

[Zydnar]

I am not an expert in cryptography but if there is the way to include in generating GPU using CUDA or openCL, you should use it, not only CPU.

[ghost]

The project scallion already tries to do this, I think that shallot will focus on CPU. P.S.: it seems that schallot is not really active anymore, you may want to take a look at eschalot.

[strugee]

Duplicate of #7

[drvladb]

I agree @nashe