Extremely fast non-cryptographic hash algorithm xxhash

xxHash is an Extremely fast Hash algorithm, running at RAM speed limits. It successfully completes the SMHasher test suite which evaluates collision, dispersion and randomness qualities of hash functions.

Benchmarks

This benchmark was launched on a Windows 10 (10.0.16299.309). The reference system uses a Intel Core i7-4700MQ CPU 2.40GHz (Haswell)

Method	x64
Hash32 Array	5.05 GB/s
Hash64 Array	8.92 GB/s
Hash32 Stream	3.22 GB/s
Hash64 Stream	4.81 GB/s

Api

public static uint ComputeHash(byte[] data, int length, uint seed = 0) { throw null; }
public static uint ComputeHash(Stream stream, int bufferSize = 4096, uint seed = 0) { throw null; }
public static async Task<uint> ComputeHashAsync(Stream stream, int bufferSize = 4096, uint seed = 0) { throw null; }

public static ulong ComputeHash(byte[] data, int length, ulong seed = 0) { throw null; }
public static ulong ComputeHash(Stream stream, int bufferSize = 8192, ulong seed = 0) { throw null; }
public static async Task<ulong> ComputeHashAsync(Stream stream, int bufferSize = 8192, ulong seed = 0) { throw null; }

Examples

A few examples of how to use api

byte[] data = Encoding.UTF8.GetBytes("veni vidi vici");

ulong h64_1 = xxHash64.ComputeHash(data, data.Length);
ulong h64_2 = xxHash64.ComputeHash(new MemoryStream(data));
ulong h64_3 = await xxHash64.ComputeHashAsync(new MemoryStream(data));

uint h32_1 = xxHash32.ComputeHash(data, data.Length);
uint h32_2 = xxHash32.ComputeHash(new MemoryStream(data));
uint h32_3 = await xxHash32.ComputeHashAsync(new MemoryStream(data));