SauceControl.Blake2Fast 2.0.0

Prefix Reserved
.NET Core 2.1 This package targets .NET Core 2.1. The package is compatible with this framework or higher. .NET Standard 1.1 This package targets .NET Standard 1.1. The package is compatible with this framework or higher. .NET Framework 4.5 This package targets .NET Framework 4.5. The package is compatible with this framework or higher. 
dotnet add package SauceControl.Blake2Fast --version 2.0.0                

                    
                

            
NuGet\Install-Package SauceControl.Blake2Fast -Version 2.0.0
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package. 
<PackageReference Include="SauceControl.Blake2Fast" Version="2.0.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
paket add SauceControl.Blake2Fast --version 2.0.0                

                    
                

            
#r "nuget: SauceControl.Blake2Fast, 2.0.0"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package. 
// Install SauceControl.Blake2Fast as a Cake Addin
#addin nuget:?package=SauceControl.Blake2Fast&version=2.0.0

// Install SauceControl.Blake2Fast as a Cake Tool
#tool nuget:?package=SauceControl.Blake2Fast&version=2.0.0

These RFC 7693-compliant BLAKE2 implementations have been tuned for high speed and low memory usage. The .NET Core builds use the new x86 SIMD Intrinsics for even greater speed. Span{byte} is used throughout for lower memory overhead compared to byte[] based APIs.

On .NET Core 2.1+, Blake2Fast includes SSE4.1 SIMD-accelerated implementations of both BLAKE2b and BLAKE2s.

On .NET Core 3+, a faster AVX2 implementation of BLAKE2b is included in addition to the SSE4.1 implementation.

Usage

All-at-Once Hashing

The simplest and lightest-weight way to calculate a hash is the all-at-once ComputeHash method.

var hash = Blake2b.ComputeHash(data);

BLAKE2 supports variable digest lengths from 1 to 32 bytes for BLAKE2s or 1 to 64 bytes for BLAKE2b.

var hash = Blake2b.ComputeHash(42, data);

BLAKE2 also natively supports keyed hashing.

var hash = Blake2b.ComputeHash(key, data);

Incremental Hashing

BLAKE2 hashes can be incrementally updated if you do not have the data available all at once.

async Task<byte[]> ComputeHashAsync(Stream data)
{
    var hasher = Blake2b.CreateIncrementalHasher();
    var buffer = ArrayPool<byte>.Shared.Rent(4096);

    int bytesRead;
    while ((bytesRead = await data.ReadAsync(buffer, 0, buffer.Length)) > 0)
        hasher.Update(new Span<byte>(buffer, 0, bytesRead));

    ArrayPool<byte>.Shared.Return(buffer);
    return hasher.Finish();
}

Allocation-Free Hashing

The output hash digest can be written to an existing buffer to avoid allocating a new array each time.

Span<byte> buffer = stackalloc byte[Blake2b.DefaultDigestLength];
Blake2b.ComputeAndWriteHash(data, buffer);

This is especially useful when performing an iterative hash, as might be used in a key derivation function.

byte[] DeriveBytes(string password, ReadOnlySpan<byte> salt)
{
    // Create key from password, then hash the salt using the key
    var pwkey = Blake2b.ComputeHash(Encoding.UTF8.GetBytes(password));
    var hbuff = Blake2b.ComputeHash(pwkey, salt);

    // Hash the hash lots of times, re-using the same buffer
    for (int i = 0; i < 999_999; i++)
        Blake2b.ComputeAndWriteHash(pwkey, hbuff, hbuff);

    return hbuff;
}

System.Security.Cryptography Interop

For interoperating with code that uses System.Security.Cryptography primitives, Blake2Fast can create a HashAlgorithm wrapper. The wrapper inherits from HMAC in case keyed hashing is required.

HashAlgorithm is less efficient than the above methods, so use it only when necessary for compatibility.

byte[] WriteDataAndCalculateHash(byte[] data, string outFile)
{
    using (var hashAlg = Blake2b.CreateHashAlgorithm())
    using (var fileStream = new FileStream(outFile, FileMode.Create))
    using (var cryptoStream = new CryptoStream(fileStream, hashAlg, CryptoStreamMode.Write))
    {
        cryptoStream.Write(data, 0, data.Length);
        cryptoStream.FlushFinalBlock();
        return hashAlg.Hash;
    }
}
Product Compatible and additional computed target framework versions.
.NET net5.0 was computed.  net5.0-windows was computed.  net6.0 was computed.  net6.0-android was computed.  net6.0-ios was computed.  net6.0-maccatalyst was computed.  net6.0-macos was computed.  net6.0-tvos was computed.  net6.0-windows was computed.  net7.0 was computed.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed.  net8.0 was computed.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed. 
.NET Core netcoreapp1.0 was computed.  netcoreapp1.1 was computed.  netcoreapp2.0 was computed.  netcoreapp2.1 is compatible.  netcoreapp2.2 was computed.  netcoreapp3.0 is compatible.  netcoreapp3.1 was computed. 
.NET Standard netstandard1.1 is compatible.  netstandard1.2 was computed.  netstandard1.3 is compatible.  netstandard1.4 was computed.  netstandard1.5 was computed.  netstandard1.6 was computed.  netstandard2.0 is compatible.  netstandard2.1 is compatible. 
.NET Framework net45 is compatible.  net451 was computed.  net452 was computed.  net46 was computed.  net461 was computed.  net462 was computed.  net463 was computed.  net47 was computed.  net471 was computed.  net472 was computed.  net48 was computed.  net481 was computed. 
MonoAndroid monoandroid was computed. 
MonoMac monomac was computed. 
MonoTouch monotouch was computed. 
Tizen tizen30 was computed.  tizen40 was computed.  tizen60 was computed. 
Universal Windows Platform uap was computed.  uap10.0 was computed. 
Windows Phone wpa81 was computed. 
Windows Store netcore was computed.  netcore45 was computed.  netcore451 was computed. 
Xamarin.iOS xamarinios was computed. 
Xamarin.Mac xamarinmac was computed. 
Xamarin.TVOS xamarintvos was computed. 
Xamarin.WatchOS xamarinwatchos was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

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Version Downloads Last updated
2.0.0 960,513 6/13/2020
1.0.0 23,216 7/26/2019
0.2.0 7,519 6/18/2018
0.1.0 1,435 6/15/2018

See https://github.com/saucecontrol/Blake2Fast/releases for release-specific notes.