AddAuthentication

// C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App\7.0.5\Microsoft.AspNetCore.Authentication.dll
// Microsoft.AspNetCore.Authentication, Version=7.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60

https://www.nuget.org/packages/Microsoft.AspNetCore.App.Ref/7.0.5

This package was built from the source code at https://github.com/dotnet/aspnetcore/tree/d47e49e9c1e173ac90821f7e89cc38e710274241

aspnetcore/src/Security/Authentication/Core/src/AuthenticationServiceCollectionExtensions.cs at d47e49e9c1e173ac90821f7e89cc38e710274241 · dotnet/aspnetcore (github.com)

    /// <summary>
    /// Registers services required by authentication services.
    /// </summary>
    /// <param name="services">The <see cref="IServiceCollection"/>.</param>
    /// <returns>A <see cref="AuthenticationBuilder"/> that can be used to further configure authentication.</returns>
    public static AuthenticationBuilder AddAuthentication(this IServiceCollection services)
    {
        if (services == null)
        {
            throw new ArgumentNullException(nameof(services));
        }

        services.AddAuthenticationCore();
        services.AddDataProtection();
        services.AddWebEncoders();
        services.TryAddSingleton<ISystemClock, SystemClock>();
        services.TryAddSingleton<IAuthenticationConfigurationProvider, DefaultAuthenticationConfigurationProvider>();

        return new AuthenticationBuilder(services);
    }

    /// <summary>
    /// Registers services required by authentication services. <paramref name="defaultScheme"/> specifies the name of the
    /// scheme to use by default when a specific scheme isn't requested.
    /// </summary>
    /// <param name="services">The <see cref="IServiceCollection"/>.</param>
    /// <param name="defaultScheme">The default scheme used as a fallback for all other schemes.</param>
    /// <returns>A <see cref="AuthenticationBuilder"/> that can be used to further configure authentication.</returns>
    public static AuthenticationBuilder AddAuthentication(this IServiceCollection services, string defaultScheme)
        => services.AddAuthentication(o => o.DefaultScheme = defaultScheme);

    /// <summary>
    /// Registers services required by authentication services and configures <see cref="AuthenticationOptions"/>.
    /// </summary>
    /// <param name="services">The <see cref="IServiceCollection"/>.</param>
    /// <param name="configureOptions">A delegate to configure <see cref="AuthenticationOptions"/>.</param>
    /// <returns>A <see cref="AuthenticationBuilder"/> that can be used to further configure authentication.</returns>
    public static AuthenticationBuilder AddAuthentication(this IServiceCollection services, Action<AuthenticationOptions> configureOptions)
    {
        if (services == null)
        {
            throw new ArgumentNullException(nameof(services));
        }

        if (configureOptions == null)
        {
            throw new ArgumentNullException(nameof(configureOptions));
        }

        var builder = services.AddAuthentication();
        services.Configure(configureOptions);
        return builder;
    }