Reworked encryption to use less heap allocated buffers for secrets.

Also some work on plugin system.

IdentityShroud.Core/CoreServiceCollectionExtensions.cs

@@ -0,0 +1,38 @@
+using IdentityShroud.Core.Contracts;
+using IdentityShroud.Core.EFCore;
+using IdentityShroud.Core.Security;
+using IdentityShroud.Core.Security.Keys;
+using IdentityShroud.Core.Services;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace IdentityShroud.Core;
+
+public static class CoreServiceCollectionExtensions
+{
+    public static IServiceCollection AddCore(this IServiceCollection services)
+    {
+        services.AddScoped<Db>();
+
+        services.Scan(scan => scan
+            .FromAssemblyOf<RealmService>()
+            .AddClasses(classes => classes.AssignableTo<IJwtSigner>())
+            .AsImplementedInterfaces()
+            .WithSingletonLifetime());
+        services.AddSingleton<IJwtSignerFactory, JwtSignerFactory>();
+        
+        services.AddSingleton<IClock, ClockService>();
+        services.AddSingleton<IDekEncryptionService, DekEncryptionService>();
+        services.AddScoped<IDataEncryptionService, DataEncryptionService>();
+        services.AddScoped<IRealmContext, RealmContext>();
+        services.AddScoped<IKeyProviderFactory, KeyProviderFactory>();
+        services.AddScoped<IKeyService, KeyService>();
+        services.AddSingleton<ISecretProvider, ConfigurationSecretProvider>();
+        
+        
+        services.AddScoped<IClientService, ClientService>();
+        services.AddScoped<IRealmService, RealmService>();
+
+        
+        return services;
+    }    
+}