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
```cs
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 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 ComputeHashAsync(Stream stream, int bufferSize = 8192, ulong seed = 0) { throw null; }
```
## Examples
A few examples of how to use api
```cs
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));
```