Curve25519

```
┌─(~/feina/code/delft/tribler
└──> nosetests dispersy/tests/test_crypto.py
very-low verify 0.504497051239 sign 0.2747631073 genkey 0.000271797180176
low verify 0.657777070999 sign 0.348011016846 genkey 0.000355005264282
medium verify 2.07961583138 sign 1.07417416573 genkey 0.00103187561035
high verify 5.25265812874 sign 2.70425796509 genkey 0.00267887115479
curve25519 verify 0.161489963531 sign 0.0772430896759 genkey 0.000488042831421
...
----------------------------------------------------------------------
Ran 3 tests in 18.737s
```