DSInternals.Win32.WebAuthn 3.2.0

Prefix Reserved
.NET 8.0 This package targets .NET 8.0. The package is compatible with this framework or higher. .NET Framework 4.8 This package targets .NET Framework 4.8. The package is compatible with this framework or higher. 
dotnet add package DSInternals.Win32.WebAuthn --version 3.2.0
                    


                    

                
NuGet\Install-Package DSInternals.Win32.WebAuthn -Version 3.2.0
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="DSInternals.Win32.WebAuthn" Version="3.2.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
<PackageVersion Include="DSInternals.Win32.WebAuthn" Version="3.2.0" />
                    


                            Directory.Packages.props
                        

                    

                
<PackageReference Include="DSInternals.Win32.WebAuthn" />
                    


                            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 DSInternals.Win32.WebAuthn --version 3.2.0
                    


                    

                
#r "nuget: DSInternals.Win32.WebAuthn, 3.2.0"
#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 DSInternals.Win32.WebAuthn@3.2.0
#: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=DSInternals.Win32.WebAuthn&version=3.2.0
                    


                            Install as a Cake Addin
                        

                    

                
#tool nuget:?package=DSInternals.Win32.WebAuthn&version=3.2.0
                    


                            Install as a Cake Tool

DSInternals.Win32.WebAuthn

Passkeys / FIDO2 / W3C Web Authentication .NET Library for Windows Desktop and CLI Applications

DSInternals.Win32.WebAuthn is a managed wrapper of the low-level Windows 10+ WebAuthn API (defined in webauthn.h and implemented in webauthn.dll). It allows .NET applications to directly interact with passkeys and FIDO2 authenticators — including Windows Hello, Microsoft Authenticator, YubiKey, Feitian, and Crayonic — on Windows.

The same API is used by browsers such as Chromium and Firefox to implement passwordless web authentication, and can also be used by any .NET desktop or CLI application.

Requirements

  • Windows 10 version 1903 or newer
  • One of: .NET 10, .NET 8, or .NET Framework 4.8

Usage

The main entry point is the WebAuthnApi class in the DSInternals.Win32.WebAuthn namespace.

Registration (Attestation)

using DSInternals.Win32.WebAuthn;

var rp = new RelyingPartyInformation()
{
    Id = "login.microsoft.com",
    Name = "Microsoft"
};

var user = new UserInformation()
{
    Name = "john.doe@outlook.com",
    DisplayName = "John Doe",
    Id = Base64UrlConverter.FromBase64UrlString("TUY65dH-Otl4jMdTRvlFQ1aApACYsuqGKSPQDQc1Bd4WVyw")
};

var challenge = new byte[] { 0, 1, 2, 3 };
var api = new WebAuthnApi();

var response = api.AuthenticatorMakeCredential(
    rp,
    user,
    challenge,
    UserVerificationRequirement.Required,
    AuthenticatorAttachment.Any);

Authentication (Assertion)

using DSInternals.Win32.WebAuthn;

var api = new WebAuthnApi();
var challenge = new byte[] { 0, 1, 2, 3 };

var response = api.AuthenticatorGetAssertion(
    "login.microsoft.com",
    challenge,
    UserVerificationRequirement.Required,
    AuthenticatorAttachment.CrossPlatform);

Async variants (AuthenticatorMakeCredentialAsync and AuthenticatorGetAssertionAsync) are also available and support cancellation.

The samples above are illustrative and not production-ready: they omit validation and use hardcoded values. In particular, the challenge must be generated with a cryptographically secure random number generator.

License

Released under the MIT License.

Product Compatible and additional computed target framework versions.
.NET net8.0-windows7.0 is compatible.  net9.0-windows was computed.  net10.0-windows was computed.  net10.0-windows7.0 is compatible. 
.NET Framework net48 is compatible.  net481 was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

NuGet packages (1)

Showing the top 1 NuGet packages that depend on DSInternals.Win32.WebAuthn:

Package Downloads
DSInternals.Win32.WebAuthn.Adapter

Bridge between Fido2.Models and DSInternals.Win32.WebAuthn packages

GitHub repositories

This package is not used by any popular GitHub repositories.

Version Downloads Last Updated
3.2.0 196 6/4/2026
3.1.0 569 5/14/2026
3.0.0 204 5/7/2026
2.1.0 1,045 4/5/2026
2.0.0 115 4/3/2026
1.0.6 10,850 1/16/2025
1.0.5 305 11/14/2024
1.0.4 1,110 10/6/2024
1.0.3 327 8/16/2024
1.0.2 295 8/14/2024
1.0.0 297 8/11/2024

- `WebAuthnApi.AuthenticatorMakeCredential` / `AuthenticatorGetAssertion` now prefer the native `pbRegistrationResponseJSON` / `pbAuthenticationResponseJSON` returned by recent WebAuthn API versions, deserializing the full credential (including `clientExtensionResults`) verbatim from the OS-produced JSON. The legacy field-by-field assembly remains as a fallback for older OS versions.
- `AuthenticatorDetails.AuthenticatorId` (surfaced by `Get-PasskeyAuthenticator`) was renamed to `AaGuid` and its type changed from `byte[]` to `Guid?`. The big-endian AAGUID returned by the Win32 API is now decoded and exposed as a `Guid` instead of a Base64Url string.
- Added a `BrowserInPrivateMode` flag (`WEBAUTHN_AUTHENTICATOR_HINTS_FLAGS_BROWSER_IN_PRIVATE_MODE`) so callers can signal that the request originates from a browser running in private/incognito mode; no information about the operation is written to the Windows event log in that case.