DeterministicGuids 1.0.0

.NET 6.0 This package targets .NET 6.0. The package is compatible with this framework or higher. .NET Standard 2.0 This package targets .NET Standard 2.0. The package is compatible with this framework or higher.
There is a newer version of this package available.
See the version list below for details. 
dotnet add package DeterministicGuids --version 1.0.0
                    


                    

                
NuGet\Install-Package DeterministicGuids -Version 1.0.0
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="DeterministicGuids" Version="1.0.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
<PackageVersion Include="DeterministicGuids" Version="1.0.0" />
                    


                            Directory.Packages.props
                        

                    

                
<PackageReference Include="DeterministicGuids" />
                    


                            Project file
For projects that support Central Package Management (CPM), copy this XML node into the solution Directory.Packages.props file to version the package. 
paket add DeterministicGuids --version 1.0.0
                    


                    

                
#r "nuget: DeterministicGuids, 1.0.0"
#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. 
#:package DeterministicGuids@1.0.0
#:package directive can be used in C# file-based apps starting in .NET 10 preview 4. Copy this into a .cs file before any lines of code to reference the package. 
#addin nuget:?package=DeterministicGuids&version=1.0.0
                    


                            Install as a Cake Addin
                        

                    

                
#tool nuget:?package=DeterministicGuids&version=1.0.0
                    


                            Install as a Cake Tool

DeterministicGuids DeterministicGuids

GitHub Workflow Status NuGet NuGet Codacy Grade Codecov

A small, allocation-conscious, thread-safe .NET utility for generating name-based deterministic UUIDs (a.k.a. GUIDs) using RFC 4122 version 3 (MD5) and version 5 (SHA-1).

You give it:

  • a namespace GUID (for a logical domain like "Orders", "Users", "Events")
  • a name (string within that namespace)
  • and (optionally) the UUID version (3 or 5).
    If you don't specify it, it defaults to version 5 (SHA-1).

It will always return the same GUID for the same (namespace, name, version) triplet.

This is useful for:

  • Stable IDs across services or deployments
  • Idempotent commands / events
  • Importing external data but keeping predictable identifiers
  • Deriving IDs from business keys without storing a lookup table

Features

  • ✅ Deterministic
    Same (namespace, name, version) → same output every time.

  • ✅ Standards-based
    Implements RFC 4122 §4.3 for UUIDv3 (MD5-based) and UUIDv5 (SHA-1-based).

  • ✅ Thread-safe
    No shared mutable state, no static caches, no locks. You can call it from many threads at once.

  • ✅ Optimized memory profile

    • Uses Span<byte> and stackalloc for fixed-size work.
    • Uses ArrayPool<byte> for variable-length buffers (the UTF-8 input string), instead of allocating on every call.
    • Uses incremental hashing on modern runtimes, so we never build a giant namespace+name concatenated array.

  • ✅ Zero runtime GUID parsing for known namespaces
    Namespaces are defined using the numeric Guid constructor, not Guid.Parse(...), so there is no string parsing cost at first use.

  • ✅ Multi-targeted

    • netstandard2.0
    • netstandard2.1
    • net8.0 (and above)

On newer targets we take advantage of newer BCL APIs to reduce allocations to near zero.

Quick Start

using DeterministicGuids;

// Choose a namespace (either one of the built-ins or your own Guid)
var ns = DeterministicGuid.Namespaces.Events;

// Define the stable name/key within that namespace
var key = "order:12345";

// Generate a deterministic GUID.
// This uses version 5 (SHA-1) by default.
Guid idV5 = DeterministicGuid.Create(ns, key);

Console.WriteLine(idV5);
// Same ns + key + version (5) will always produce the same Guid

Credits

Check out our list of contributors!

Product Compatible and additional computed target framework versions.
.NET net5.0 was computed.  net5.0-windows was computed.  net6.0 is compatible.  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 is compatible.  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 is compatible.  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.  net9.0 was computed.  net9.0-android was computed.  net9.0-browser was computed.  net9.0-ios was computed.  net9.0-maccatalyst was computed.  net9.0-macos was computed.  net9.0-tvos was computed.  net9.0-windows was computed.  net10.0 was computed.  net10.0-android was computed.  net10.0-browser was computed.  net10.0-ios was computed.  net10.0-maccatalyst was computed.  net10.0-macos was computed.  net10.0-tvos was computed.  net10.0-windows was computed. 
.NET Core netcoreapp2.0 was computed.  netcoreapp2.1 was computed.  netcoreapp2.2 was computed.  netcoreapp3.0 was computed.  netcoreapp3.1 was computed. 
.NET Standard netstandard2.0 is compatible.  netstandard2.1 is compatible. 
.NET Framework 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 tizen40 was computed.  tizen60 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.

  • .NETStandard 2.0

  • .NETStandard 2.1

    • No dependencies.

  • net6.0

    • No dependencies.

  • net7.0

    • No dependencies.

  • net8.0

    • No dependencies.

NuGet packages

This package is not used by any NuGet packages.

GitHub repositories

This package is not used by any popular GitHub repositories.

Version Downloads Last Updated
1.0.10 3,754 2/10/2026
1.0.9 1,223 1/24/2026
1.0.8 557 1/14/2026
1.0.7 8,687 12/17/2025
1.0.6 691 12/6/2025
1.0.5 2,397 11/2/2025
1.0.4 141 11/1/2025
1.0.3 208 10/27/2025
1.0.2 195 10/26/2025
1.0.0 197 10/26/2025

Initial release.