SipHash PRF implementation in C#, heavily optimized towards speed. This code is in public domain, free for anyone to use.
SipHash is a very fast pseudo-random function, producing 64-bit output using 128-bit key. SipHash is very fast on 64-bit CPUs.
Below are the results of a benchmark (processing 10 GiB in 4 KiB chunks) I ran on laptop i7 3630QM (Turbo Boost enabled) on Win8.1:
|.NET 4.6.1||64 bit||1 226 MiB/s|
|.NET 4.6.1||32 bit||324 MiB/s|
|.NET Core RC 2||64 bit||1 940 MiB/s|
|.NET Core RC 2||32 bit||324 MiB/s|
Please note that 64-bit .NET Core Preview 2 JIT supports bit rotation idioms, while the 32-bit .NET Core JIT and the full .NET framework JITs still translate rotations into a series of SHIFTs, MOV and OR instructions (which is the reason for massive performance difference).