5-improve-encrypted-storage (#6)

Added the use of DEK's for encryption of secrets. Both the KEK's and DEK's are stored in a way that you can have multiple key of which one is active. But the others are still available for decrypting. This allows for implementing key rotation.

Co-authored-by: eelke <eelke@eelkeklein.nl>
Co-authored-by: Eelke76 <31384324+Eelke76@users.noreply.github.com>
Reviewed-on: #6

IdentityShroud.Api.Tests/Apis/ClientApiTests.cs

@@ -0,0 +1,179 @@
+using System.Net;
+using System.Net.Http.Json;
+using IdentityShroud.Core;
+using IdentityShroud.Core.Model;
+using IdentityShroud.Core.Tests.Fixtures;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace IdentityShroud.Api.Tests.Apis;
+
+public class ClientApiTests : IClassFixture<ApplicationFactory>
+{
+    private readonly ApplicationFactory _factory;
+
+    public ClientApiTests(ApplicationFactory factory)
+    {
+        _factory = factory;
+
+        using var scope = _factory.Services.CreateScope();
+        var db = scope.ServiceProvider.GetRequiredService<Db>();
+        if (!db.Database.EnsureCreated())
+        {
+            db.Database.ExecuteSqlRaw("TRUNCATE realm CASCADE;");
+        }
+    }
+
+    [Theory]
+    [InlineData(null, false, "ClientId")]
+    [InlineData("", false, "ClientId")]
+    [InlineData("my-client", true, "")]
+    public async Task Create_Validation(string? clientId, bool succeeds, string fieldName)
+    {
+        // setup
+        Realm realm = await CreateRealmAsync("test-realm", "Test Realm");
+
+        var client = _factory.CreateClient();
+
+        // act
+        var response = await client.PostAsync(
+            $"/api/v1/realms/{realm.Id}/clients",
+            JsonContent.Create(new { ClientId = clientId }),
+            TestContext.Current.CancellationToken);
+
+#if DEBUG
+        string contents = await response.Content.ReadAsStringAsync(TestContext.Current.CancellationToken);
+#endif
+
+        if (succeeds)
+        {
+            Assert.Equal(HttpStatusCode.Created, response.StatusCode);
+        }
+        else
+        {
+            Assert.Equal(HttpStatusCode.BadRequest, response.StatusCode);
+            var problemDetails =
+                await response.Content.ReadFromJsonAsync<ValidationProblemDetails>(
+                    TestContext.Current.CancellationToken);
+
+            Assert.Contains(problemDetails!.Errors, e => e.Key == fieldName);
+        }
+    }
+
+    [Fact]
+    public async Task Create_Success_ReturnsCreatedWithLocation()
+    {
+        // setup
+        Realm realm = await CreateRealmAsync("create-realm", "Create Realm");
+
+        var client = _factory.CreateClient();
+
+        // act
+        var response = await client.PostAsync(
+            $"/api/v1/realms/{realm.Id}/clients",
+            JsonContent.Create(new { ClientId = "new-client", Name = "New Client" }),
+            TestContext.Current.CancellationToken);
+
+#if DEBUG
+        string contents = await response.Content.ReadAsStringAsync(TestContext.Current.CancellationToken);
+#endif
+
+        // verify
+        Assert.Equal(HttpStatusCode.Created, response.StatusCode);
+
+        var body = await response.Content.ReadFromJsonAsync<ClientCreateReponse>(
+            TestContext.Current.CancellationToken);
+
+        Assert.NotNull(body);
+        Assert.Equal("new-client", body.ClientId);
+        Assert.True(body.Id > 0);
+    }
+
+    [Fact]
+    public async Task Create_UnknownRealm_ReturnsNotFound()
+    {
+        var client = _factory.CreateClient();
+
+        var response = await client.PostAsync(
+            $"/api/v1/realms/{Guid.NewGuid()}/clients",
+            JsonContent.Create(new { ClientId = "some-client" }),
+            TestContext.Current.CancellationToken);
+
+        Assert.Equal(HttpStatusCode.NotFound, response.StatusCode);
+    }
+
+    [Fact]
+    public async Task Get_Success()
+    {
+        // setup
+        Realm realm = await CreateRealmAsync("get-realm", "Get Realm");
+        Client dbClient = await CreateClientAsync(realm, "get-client", "Get Client");
+
+        var httpClient = _factory.CreateClient();
+
+        // act
+        var response = await httpClient.GetAsync(
+            $"/api/v1/realms/{realm.Id}/clients/{dbClient.Id}",
+            TestContext.Current.CancellationToken);
+
+#if DEBUG
+        string contents = await response.Content.ReadAsStringAsync(TestContext.Current.CancellationToken);
+#endif
+
+        // verify
+        Assert.Equal(HttpStatusCode.OK, response.StatusCode);
+
+        var body = await response.Content.ReadFromJsonAsync<ClientRepresentation>(
+            TestContext.Current.CancellationToken);
+
+        Assert.NotNull(body);
+        Assert.Equal(dbClient.Id, body.Id);
+        Assert.Equal("get-client", body.ClientId);
+        Assert.Equal("Get Client", body.Name);
+        Assert.Equal(realm.Id, body.RealmId);
+    }
+
+    [Fact]
+    public async Task Get_UnknownClient_ReturnsNotFound()
+    {
+        // setup
+        Realm realm = await CreateRealmAsync("notfound-realm", "NotFound Realm");
+
+        var httpClient = _factory.CreateClient();
+
+        // act
+        var response = await httpClient.GetAsync(
+            $"/api/v1/realms/{realm.Id}/clients/99999",
+            TestContext.Current.CancellationToken);
+
+        // verify
+        Assert.Equal(HttpStatusCode.NotFound, response.StatusCode);
+    }
+
+    private async Task<Realm> CreateRealmAsync(string slug, string name)
+    {
+        using var scope = _factory.Services.CreateScope();
+        var db = scope.ServiceProvider.GetRequiredService<Db>();
+        var realm = new Realm { Slug = slug, Name = name };
+        db.Realms.Add(realm);
+        await db.SaveChangesAsync(TestContext.Current.CancellationToken);
+        return realm;
+    }
+
+    private async Task<Client> CreateClientAsync(Realm realm, string clientId, string? name = null)
+    {
+        using var scope = _factory.Services.CreateScope();
+        var db = scope.ServiceProvider.GetRequiredService<Db>();
+        var client = new Client
+        {
+            RealmId = realm.Id,
+            ClientId = clientId,
+            Name = name,
+            CreatedAt = DateTime.UtcNow,
+        };
+        db.Clients.Add(client);
+        await db.SaveChangesAsync(TestContext.Current.CancellationToken);
+        return client;
+    }
+}

IdentityShroud.Api.Tests/Apis/RealmApisTests.cs

@@ -44,7 +44,9 @@ public class RealmApisTests : IClassFixture<ApplicationFactory>
         var client = _factory.CreateClient();
 
         Guid? inputId = id is null ? (Guid?)null : new Guid(id);
-        var response = await client.PostAsync("/realms", JsonContent.Create(new
+        
+        // act
+        var response = await client.PostAsync("/api/v1/realms", JsonContent.Create(new
             {
                 Id = inputId,
                 Slug = slug,
@@ -88,16 +90,21 @@ public class RealmApisTests : IClassFixture<ApplicationFactory>
 
         // act
         var client = _factory.CreateClient();
-        var response = await client.GetAsync("/realms/foo/.well-known/openid-configuration",
+        var response = await client.GetAsync("auth/realms/foo/.well-known/openid-configuration",
             TestContext.Current.CancellationToken);
 
         // verify
+#if DEBUG
+        string contents = await response.Content.ReadAsStringAsync(TestContext.Current.CancellationToken);
+#endif
+        Assert.Equal(HttpStatusCode.OK, response.StatusCode);        
+        
         var result = await response.Content.ReadFromJsonAsync<JsonObject>(TestContext.Current.CancellationToken);
         Assert.NotNull(result);
-        JsonObjectAssert.Equal("http://localhost/realms/foo/openid-connect/auth", result, "authorization_endpoint");
+        JsonObjectAssert.Equal("http://localhost/auth/realms/foo/openid-connect/auth", result, "authorization_endpoint");
-        JsonObjectAssert.Equal("http://localhost/realms/foo", result, "issuer");
+        JsonObjectAssert.Equal("http://localhost/auth/realms/foo", result, "issuer");
-        JsonObjectAssert.Equal("http://localhost/realms/foo/openid-connect/token", result, "token_endpoint");
+        JsonObjectAssert.Equal("http://localhost/auth/realms/foo/openid-connect/token", result, "token_endpoint");
-        JsonObjectAssert.Equal("http://localhost/realms/foo/openid-connect/jwks", result, "jwks_uri");
+        JsonObjectAssert.Equal("http://localhost/auth/realms/foo/openid-connect/jwks", result, "jwks_uri");
     }
 
     [Theory]
@@ -107,7 +114,7 @@ public class RealmApisTests : IClassFixture<ApplicationFactory>
     {
         // act
         var client = _factory.CreateClient();
-        var response = await client.GetAsync("/realms/bar/.well-known/openid-configuration",
+        var response = await client.GetAsync($"/realms/{slug}/.well-known/openid-configuration",
             TestContext.Current.CancellationToken);
         
         // verify
@@ -118,34 +125,35 @@ public class RealmApisTests : IClassFixture<ApplicationFactory>
     public async Task GetJwks()
     {
         // setup
-        IEncryptionService encryptionService = _factory.Services.GetRequiredService<IEncryptionService>();
+        IDekEncryptionService dekEncryptionService = _factory.Services.GetRequiredService<IDekEncryptionService>();
 
         using var rsa = RSA.Create(2048);
         RSAParameters parameters = rsa.ExportParameters(includePrivateParameters: false);
 
-        Key key = new()
+        RealmKey realmKey = new()
         {
             Id = Guid.NewGuid(),
+            KeyType = "RSA",
+            Key = dekEncryptionService.Encrypt(rsa.ExportPkcs8PrivateKey()),
             CreatedAt = DateTime.UtcNow,
         };
-        key.SetPrivateKey(encryptionService, rsa.ExportPkcs8PrivateKey());
 
         await ScopedContextAsync(async db =>
         {
-            db.Realms.Add(new Realm() { Slug = "foo", Name = "Foo", Keys = [ key ]});
+            db.Realms.Add(new Realm() { Slug = "foo", Name = "Foo", Keys = [ realmKey ]});
             await db.SaveChangesAsync(TestContext.Current.CancellationToken);
         });
     
         // act
         var client = _factory.CreateClient();
-        var response = await client.GetAsync("/realms/foo/openid-connect/jwks",
+        var response = await client.GetAsync("/auth/realms/foo/openid-connect/jwks",
             TestContext.Current.CancellationToken);
         
         Assert.Equal(HttpStatusCode.OK, response.StatusCode);
         JsonObject? payload = await response.Content.ReadFromJsonAsync<JsonObject>(TestContext.Current.CancellationToken);
 
         Assert.NotNull(payload);
-        JsonObjectAssert.Equal(key.Id.ToString(), payload, "keys[0].kid"); 
+        JsonObjectAssert.Equal(realmKey.Id.ToString(), payload, "keys[0].kid"); 
         JsonObjectAssert.Equal(WebEncoders.Base64UrlEncode(parameters.Modulus!), payload, "keys[0].n"); 
         JsonObjectAssert.Equal(WebEncoders.Base64UrlEncode(parameters.Exponent!), payload, "keys[0].e"); 
     }

IdentityShroud.Api.Tests/Fixtures/ApplicationFactory.cs

@@ -1,11 +1,6 @@
-using IdentityShroud.Core.Services;
 using Microsoft.AspNetCore.Hosting;
 using Microsoft.AspNetCore.Mvc.Testing;
-using Microsoft.EntityFrameworkCore.Infrastructure;
 using Microsoft.Extensions.Configuration;
-using Microsoft.Extensions.DependencyInjection;
-using Microsoft.VisualStudio.TestPlatform.TestHost;
-using Npgsql;
 using Testcontainers.PostgreSql;
 
 namespace IdentityShroud.Core.Tests.Fixtures;
@@ -33,7 +28,10 @@ public class ApplicationFactory : WebApplicationFactory<Program>, IAsyncLifetime
                 new Dictionary<string, string?>
                 {
                     ["Db:ConnectionString"] = _postgresqlServer.GetConnectionString(),
-                    ["Encryption:Master"] = "GVd07qW0frRX9quPX/X62L88BeRR7+IzgRJHtG7ZzHw=",
+                    ["secrets:master:0:Id"] = "94970f27-3d88-4223-9940-7dd57548f5b5",
+                    ["secrets:master:0:Active"] = "true",
+                    ["secrets:master:0:Algorithm"] = "AES",
+                    ["secrets:master:0:Key"] = "GVd07qW0frRX9quPX/X62L88BeRR7+IzgRJHtG7ZzHw=",
                 });
         });
         

IdentityShroud.Api.Tests/Mappers/KeyMapperTests.cs

@@ -1,41 +0,0 @@
-using System.Security.Cryptography;
-using IdentityShroud.Api.Mappers;
-using IdentityShroud.Core.Contracts;
-using IdentityShroud.Core.Messages;
-using IdentityShroud.Core.Model;
-using IdentityShroud.TestUtils.Substitutes;
-using Microsoft.AspNetCore.WebUtilities;
-
-namespace IdentityShroud.Api.Tests.Mappers;
-
-public class KeyMapperTests
-{
-    private readonly IEncryptionService _encryptionService = EncryptionServiceSubstitute.CreatePassthrough();
-
-    [Fact]
-    public void Test()
-    {
-        // Setup
-        using RSA rsa = RSA.Create(2048);
-
-        RSAParameters parameters = rsa.ExportParameters(includePrivateParameters: false);
-        
-        Key key = new()
-        {
-            Id = new("60bb79cf-4bac-4521-87f2-ac87cc15541f"),
-            CreatedAt = DateTime.UtcNow,
-            Priority = 10,
-        };
-        key.SetPrivateKey(_encryptionService, rsa.ExportPkcs8PrivateKey());
-
-        // Act
-        KeyMapper mapper = new(_encryptionService);
-        JsonWebKey jwk = mapper.KeyToJsonWebKey(key);
-
-        Assert.Equal("RSA", jwk.KeyType);
-        Assert.Equal(key.Id.ToString(), jwk.KeyId);
-        Assert.Equal("sig", jwk.Use);
-        Assert.Equal(parameters.Exponent, WebEncoders.Base64UrlDecode(jwk.Exponent));
-        Assert.Equal(parameters.Modulus, WebEncoders.Base64UrlDecode(jwk.Modulus));
-    }
-}

IdentityShroud.Api.Tests/Mappers/KeyServiceTests.cs

@@ -0,0 +1,46 @@
+using System.Buffers.Text;
+using System.Security.Cryptography;
+using IdentityShroud.Core.Contracts;
+using IdentityShroud.Core.Model;
+using IdentityShroud.Core.Security;
+using IdentityShroud.Core.Security.Keys;
+using IdentityShroud.Core.Services;
+using IdentityShroud.TestUtils.Substitutes;
+
+namespace IdentityShroud.Api.Tests.Mappers;
+
+public class KeyServiceTests
+{
+    private readonly NullDekEncryptionService _dekEncryptionService = new(); 
+
+    [Fact]
+    public void Test()
+    {
+        // Setup
+        using RSA rsa = RSA.Create(2048);
+
+        RSAParameters parameters = rsa.ExportParameters(includePrivateParameters: false);
+
+        DekId kid = DekId.NewId();
+        
+        RealmKey realmKey = new()
+        {
+            Id = new("60bb79cf-4bac-4521-87f2-ac87cc15541f"),
+            KeyType = "RSA",
+            Key = new(_dekEncryptionService.KeyId, rsa.ExportPkcs8PrivateKey()),
+            CreatedAt = DateTime.UtcNow,
+            Priority = 10,
+        };
+        
+        // Act
+        KeyService sut = new(_dekEncryptionService, new KeyProviderFactory(), new ClockService());
+        var jwk = sut.CreateJsonWebKey(realmKey);
+
+        Assert.NotNull(jwk);
+        Assert.Equal("RSA", jwk.KeyType);
+        Assert.Equal(realmKey.Id.ToString(), jwk.KeyId);
+        Assert.Equal("sig", jwk.Use);
+        Assert.Equal(parameters.Exponent, Base64Url.DecodeFromChars(jwk.Exponent));
+        Assert.Equal(parameters.Modulus, Base64Url.DecodeFromChars(jwk.Modulus));
+    }
+}

IdentityShroud.Api/Apis/ClientApi.cs

@@ -0,0 +1,73 @@
+using FluentResults;
+using IdentityShroud.Api.Mappers;
+using IdentityShroud.Core.Contracts;
+using IdentityShroud.Core.Model;
+using Microsoft.AspNetCore.Http.HttpResults;
+using Microsoft.AspNetCore.Mvc;
+
+namespace IdentityShroud.Api;
+
+
+
+public record ClientCreateReponse(int Id, string ClientId);
+
+/// <summary>
+/// The part of the api below realms/{slug}/clients
+/// </summary>
+public static class ClientApi
+{
+    public const string ClientGetRouteName = "ClientGet";
+    
+    public static void MapEndpoints(this IEndpointRouteBuilder erp)
+    {
+        RouteGroupBuilder clientsGroup = erp.MapGroup("clients");        
+        
+        clientsGroup.MapPost("", ClientCreate)
+            .Validate<ClientCreateRequest>() 
+            .WithName("ClientCreate")
+            .Produces(StatusCodes.Status201Created);
+        
+        var clientIdGroup = clientsGroup.MapGroup("{clientId}")
+            .AddEndpointFilter<ClientIdValidationFilter>();
+            
+        clientIdGroup.MapGet("", ClientGet)
+            .WithName(ClientGetRouteName);
+    }
+
+    private static Ok<ClientRepresentation> ClientGet(
+        Guid realmId,
+        int clientId,
+        HttpContext context)
+    {
+        Client client = (Client)context.Items["ClientEntity"]!;
+        return TypedResults.Ok(new ClientMapper().ToDto(client));
+    }
+
+    private static async Task<Results<CreatedAtRoute<ClientCreateReponse>, InternalServerError>>
+        ClientCreate(
+            Guid realmId,
+            ClientCreateRequest request, 
+            [FromServices] IClientService service,
+            HttpContext context,
+            CancellationToken cancellationToken)
+    {
+        Realm realm = context.GetValidatedRealm();
+        Result<Client> result = await service.Create(realm.Id, request, cancellationToken);
+
+        if (result.IsFailed)
+        {
+            throw new NotImplementedException();
+        }
+
+        Client client = result.Value;
+
+        return TypedResults.CreatedAtRoute(
+            new ClientCreateReponse(client.Id, client.ClientId),
+            ClientGetRouteName, 
+            new RouteValueDictionary()
+            {
+                ["realmId"] = realm.Id,
+                ["clientId"] = client.Id, 
+            });
+    }
+}

IdentityShroud.Api/Apis/Dto/ClientRepresentation.cs

@@ -0,0 +1,16 @@
+namespace IdentityShroud.Api;
+
+public record ClientRepresentation
+{
+    public int Id { get; set; }
+    public Guid RealmId { get; set; }
+    public required string ClientId { get; set; }
+    public string? Name { get; set; }
+    public string? Description { get; set; }
+    
+    public string? SignatureAlgorithm { get; set; }
+    
+    public bool AllowClientCredentialsFlow { get; set; } = false;
+    
+    public required DateTime CreatedAt { get; set; }
+}

IdentityShroud.Api/Apis/EndpointRouteBuilderExtensions.cs

@@ -0,0 +1,15 @@
+namespace IdentityShroud.Api;
+
+public static class EndpointRouteBuilderExtensions
+{
+    public static RouteHandlerBuilder Validate<TDto>(this RouteHandlerBuilder builder) where TDto : class
+        => builder.AddEndpointFilter<ValidateFilter<TDto>>();
+    
+    public static void MapApis(this IEndpointRouteBuilder erp)
+    {
+        RealmApi.MapRealmEndpoints(erp);
+        
+        OpenIdEndpoints.MapEndpoints(erp);
+    }
+    
+}

IdentityShroud.Api/Apis/Filters/ClientIdValidationFilter.cs

@@ -0,0 +1,21 @@
+using IdentityShroud.Core.Contracts;
+using IdentityShroud.Core.Model;
+
+namespace IdentityShroud.Api;
+
+public class ClientIdValidationFilter(IClientService clientService) : IEndpointFilter
+{
+    public async ValueTask<object?> InvokeAsync(EndpointFilterInvocationContext context, EndpointFilterDelegate next)
+    {
+        Guid realmId = context.Arguments.OfType<Guid>().First();
+        int id = context.Arguments.OfType<int>().First();
+        Client? client = await clientService.FindById(realmId, id, context.HttpContext.RequestAborted);
+        if (client is null)
+        {
+            return Results.NotFound();
+        }
+        context.HttpContext.Items["ClientEntity"] = client;
+
+        return await next(context);
+    }
+}

IdentityShroud.Api/Apis/Filters/RealmIdValidationFilter.cs

@@ -0,0 +1,20 @@
+using IdentityShroud.Core.Contracts;
+using IdentityShroud.Core.Model;
+
+namespace IdentityShroud.Api;
+
+public class RealmIdValidationFilter(IRealmService realmService) : IEndpointFilter
+{
+    public async ValueTask<object?> InvokeAsync(EndpointFilterInvocationContext context, EndpointFilterDelegate next)
+    {
+        Guid id = context.Arguments.OfType<Guid>().First();
+        Realm? realm = await realmService.FindById(id, context.HttpContext.RequestAborted);
+        if (realm is null)
+        {
+            return Results.NotFound();
+        }
+        context.HttpContext.Items["RealmEntity"] = realm;
+
+        return await next(context);
+    }
+}

IdentityShroud.Api/Apis/Filters/RealmSlugValidationFilter.cs

@@ -1,5 +1,5 @@
+using IdentityShroud.Core.Contracts;
 using IdentityShroud.Core.Model;
-using IdentityShroud.Core.Services;
 
 namespace IdentityShroud.Api;
 
@@ -9,12 +9,13 @@ namespace IdentityShroud.Api;
 /// consistently.
 /// </summary>
 /// <param name="realmService"></param>
-public class SlugValidationFilter(IRealmService realmService) : IEndpointFilter
+public class RealmSlugValidationFilter(IRealmService realmService) : IEndpointFilter
 {
     public async ValueTask<object?> InvokeAsync(EndpointFilterInvocationContext context, EndpointFilterDelegate next)
     {
-        string slug = context.Arguments.OfType<string>().First();
+        string realmSlug = context.Arguments.OfType<string>().FirstOrDefault()
-        Realm? realm = await realmService.FindBySlug(slug);
+            ?? throw new InvalidOperationException("Expected argument missing, ensure you include path parameters in your handlers signature even when you don't use them");
+        Realm? realm = await realmService.FindBySlug(realmSlug, context.HttpContext.RequestAborted);
         if (realm is null)
         {
             return Results.NotFound();

IdentityShroud.Api/Apis/Mappers/ClientMapper.cs

@@ -0,0 +1,11 @@
+using IdentityShroud.Core.Model;
+using Riok.Mapperly.Abstractions;
+
+namespace IdentityShroud.Api.Mappers;
+
+[Mapper]
+public partial class ClientMapper
+{
+    [MapperIgnoreSource(nameof(Client.Secrets))]
+    public partial ClientRepresentation ToDto(Client client);
+}

IdentityShroud.Api/Apis/Mappers/KeyMapper.cs

@@ -1,34 +1,22 @@
-using System.Security.Cryptography;
 using IdentityShroud.Core.Contracts;
 using IdentityShroud.Core.Messages;
 using IdentityShroud.Core.Model;
-using IdentityShroud.Core.Security;
-using Microsoft.AspNetCore.WebUtilities;
 
 namespace IdentityShroud.Api.Mappers;
 
-public class KeyMapper(IEncryptionService encryptionService)
+public class KeyMapper(IKeyService keyService)
 {
-    public JsonWebKey KeyToJsonWebKey(Key key)
+    public JsonWebKeySet KeyListToJsonWebKeySet(IEnumerable<RealmKey> keys)
     {
-        using var rsa = RsaHelper.LoadFromPkcs8(key.GetPrivateKey(encryptionService));
+        JsonWebKeySet wks = new();
-        RSAParameters parameters = rsa.ExportParameters(includePrivateParameters: false);
+        foreach (var k in keys)
-        
-        return new JsonWebKey()
         {
-            KeyType = rsa.SignatureAlgorithm,
+            var wk = keyService.CreateJsonWebKey(k);
-            KeyId = key.Id.ToString(),
+            if (wk is {})
-            Use = "sig",
+            {
-            Exponent = WebEncoders.Base64UrlEncode(parameters.Exponent!),
+                wks.Keys.Add(wk);
-            Modulus = WebEncoders.Base64UrlEncode(parameters.Modulus!),
+            }
-        };
+        }
-    }
+        return wks;
-
-    public JsonWebKeySet KeyListToJsonWebKeySet(IEnumerable<Key> keys)
-    {
-        return new JsonWebKeySet()
-        {
-            Keys = keys.Select(e => KeyToJsonWebKey(e)).ToList(),
-        };
     }
 }

IdentityShroud.Api/Apis/OpenIdEndpoints.cs

@@ -0,0 +1,72 @@
+using IdentityShroud.Api.Mappers;
+using IdentityShroud.Core.Contracts;
+using IdentityShroud.Core.Messages;
+using IdentityShroud.Core.Model;
+using Microsoft.AspNetCore.Http.HttpResults;
+using Microsoft.AspNetCore.Mvc;
+
+namespace IdentityShroud.Api;
+
+public static class OpenIdEndpoints
+{
+    // openid: auth/realms/{realmSlug}/.well-known/openid-configuration
+    // openid: auth/realms/{realmSlug}/openid-connect/(auth|token|jwks)
+    
+    
+    public static void MapEndpoints(this IEndpointRouteBuilder erp)
+    {
+        var realmsGroup = erp.MapGroup("/auth/realms");
+        
+        var realmSlugGroup = realmsGroup.MapGroup("{realmSlug}")
+            .AddEndpointFilter<RealmSlugValidationFilter>();
+        realmSlugGroup.MapGet(".well-known/openid-configuration", GetOpenIdConfiguration);
+
+        var openidConnect = realmSlugGroup.MapGroup("openid-connect");
+        openidConnect.MapPost("auth", OpenIdConnectAuth);
+        openidConnect.MapPost("token", OpenIdConnectToken);
+        openidConnect.MapGet("jwks", OpenIdConnectJwks);
+    }
+    
+    private static async Task<JsonHttpResult<OpenIdConfiguration>> GetOpenIdConfiguration(
+        string realmSlug,
+        [FromServices]IRealmService realmService,
+        HttpContext context)
+    {
+        Realm realm = context.GetValidatedRealm();
+        
+        var s = $"{context.Request.Scheme}://{context.Request.Host}{context.Request.Path}";
+        var searchString = $"realms/{realmSlug}";
+        int index = s.IndexOf(searchString, StringComparison.OrdinalIgnoreCase);
+        string baseUri = s.Substring(0, index + searchString.Length);
+
+        return TypedResults.Json(new OpenIdConfiguration()
+        {
+            AuthorizationEndpoint = baseUri + "/openid-connect/auth",
+            TokenEndpoint = baseUri + "/openid-connect/token",
+            Issuer =  baseUri,
+            JwksUri =  baseUri + "/openid-connect/jwks",
+        }, AppJsonSerializerContext.Default.OpenIdConfiguration);
+    }
+
+    private static async Task<Results<Ok<JsonWebKeySet>, BadRequest>> OpenIdConnectJwks(
+        string realmSlug,
+        [FromServices]IRealmService realmService,
+        [FromServices]KeyMapper keyMapper,
+        HttpContext context)
+    {
+        Realm realm = context.GetValidatedRealm();
+        await realmService.LoadActiveKeys(realm);
+        return TypedResults.Ok(keyMapper.KeyListToJsonWebKeySet(realm.Keys));
+    }
+
+    private static Task OpenIdConnectToken(HttpContext context)
+    {
+        throw new NotImplementedException();
+    }
+
+    private static Task OpenIdConnectAuth(HttpContext context)
+    {
+        throw new NotImplementedException();
+    }
+
+}

IdentityShroud.Api/Apis/RealmApi.cs

@@ -1,7 +1,4 @@
-using FluentResults;
+using IdentityShroud.Core.Contracts;
-using IdentityShroud.Api.Mappers;
-using IdentityShroud.Api.Validation;
-using IdentityShroud.Core.Messages;
 using IdentityShroud.Core.Messages.Realm;
 using IdentityShroud.Core.Model;
 using IdentityShroud.Core.Services;
@@ -15,26 +12,28 @@ public static class HttpContextExtensions
     public static Realm GetValidatedRealm(this HttpContext context) => (Realm)context.Items["RealmEntity"]!;    
 }
 
+// api: api/v1/realms/{realmId}/....
+// api: api/v1/realms/{realmId}/clients/{clientId}
+
 
 
 public static class RealmApi
 {
-    public static void MapRealmEndpoints(this IEndpointRouteBuilder app)
+    public static void MapRealmEndpoints(IEndpointRouteBuilder erp)
     {
-        var realmsGroup = app.MapGroup("/realms");
+        var realmsGroup = erp.MapGroup("/api/v1/realms");
         realmsGroup.MapPost("", RealmCreate)
             .Validate<RealmCreateRequest>() 
             .WithName("Create Realm")
             .Produces(StatusCodes.Status201Created);
         
-        var realmSlugGroup = realmsGroup.MapGroup("{slug}")
+        var realmIdGroup = realmsGroup.MapGroup("{realmId}")
-            .AddEndpointFilter<SlugValidationFilter>();
+            .AddEndpointFilter<RealmIdValidationFilter>();
-        realmSlugGroup.MapGet(".well-known/openid-configuration", GetOpenIdConfiguration);
+
+        ClientApi.MapEndpoints(realmIdGroup);
+        
+            
 
-        var openidConnect = realmSlugGroup.MapGroup("openid-connect");
-        openidConnect.MapPost("auth", OpenIdConnectAuth);
-        openidConnect.MapPost("token", OpenIdConnectToken);
-        openidConnect.MapGet("jwks", OpenIdConnectJwks);
     }
     
     private static async Task<Results<Created<RealmCreateResponse>, InternalServerError>> 
@@ -47,46 +46,4 @@ public static class RealmApi
         // TODO make helper to convert failure response to a proper HTTP result.
         return TypedResults.InternalServerError();
     }
-
-    private static async Task<Results<Ok<JsonWebKeySet>, BadRequest>> OpenIdConnectJwks(
-        string slug,
-        [FromServices]IRealmService realmService,
-        [FromServices]KeyMapper keyMapper,
-        HttpContext context)
-    {
-        Realm realm = context.GetValidatedRealm();
-        await realmService.LoadActiveKeys(realm);
-        return TypedResults.Ok(keyMapper.KeyListToJsonWebKeySet(realm.Keys));
-    }
-
-    private static Task OpenIdConnectToken(HttpContext context)
-    {
-        throw new NotImplementedException();
-    }
-
-    private static Task OpenIdConnectAuth(HttpContext context)
-    {
-        throw new NotImplementedException();
-    }
-
-    private static async Task<JsonHttpResult<OpenIdConfiguration>> GetOpenIdConfiguration(
-        string slug,
-        [FromServices]IRealmService realmService,
-        HttpContext context)
-    {
-        Realm realm = context.GetValidatedRealm();
-        
-        var s = $"{context.Request.Scheme}://{context.Request.Host}{context.Request.Path}";
-        var searchString = $"realms/{slug}";
-        int index = s.IndexOf(searchString, StringComparison.OrdinalIgnoreCase);
-        string baseUri = s.Substring(0, index + searchString.Length);
-
-        return TypedResults.Json(new OpenIdConfiguration()
-        {
-            AuthorizationEndpoint = baseUri + "/openid-connect/auth",
-            TokenEndpoint = baseUri + "/openid-connect/token",
-            Issuer =  baseUri,
-            JwksUri =  baseUri + "/openid-connect/jwks",
-        }, AppJsonSerializerContext.Default.OpenIdConfiguration);
-    }
 }

IdentityShroud.Api/Apis/Validation/ClientCreateRequestValidator.cs

@@ -0,0 +1,22 @@
+using FluentValidation;
+using IdentityShroud.Core.Contracts;
+
+namespace IdentityShroud.Api;
+
+public class ClientCreateRequestValidator : AbstractValidator<ClientCreateRequest>
+{
+    // most of standard ascii minus the control characters and space 
+    private const string ClientIdPattern = "^[\x21-\x7E]+";
+
+    private string[] AllowedAlgorithms = [ "RS256", "ES256" ];
+    
+    public ClientCreateRequestValidator()
+    {
+        RuleFor(e => e.ClientId).NotEmpty().MaximumLength(40).Matches(ClientIdPattern);
+        RuleFor(e => e.Name).MaximumLength(80);
+        RuleFor(e => e.Description).MaximumLength(2048);
+        RuleFor(e => e.SignatureAlgorithm)
+            .Must(v => v is null || AllowedAlgorithms.Contains(v))
+            .WithMessage($"SignatureAlgorithm must be one of {string.Join(", ", AllowedAlgorithms)} or null");
+    }
+}

IdentityShroud.Api/Apis/Validation/RealmCreateRequestValidator.cs

@@ -1,7 +1,7 @@
 using FluentValidation;
 using IdentityShroud.Core.Messages.Realm;
 
-namespace IdentityShroud.Api.Validation;
+namespace IdentityShroud.Api;
 
 public class RealmCreateRequestValidator : AbstractValidator<RealmCreateRequest>
 {

IdentityShroud.Api/Apis/Validation/ValidateFilter.cs

@@ -1,6 +1,6 @@
 using FluentValidation;
 
-namespace IdentityShroud.Api.Validation;
+namespace IdentityShroud.Api;
 
 public class ValidateFilter<T> : IEndpointFilter where T : class
 {

IdentityShroud.Api/AppJsonSerializerContext.cs

@@ -1,7 +1,6 @@
 using System.Text.Json.Serialization;
 using IdentityShroud.Core.Messages;
 using IdentityShroud.Core.Messages.Realm;
-using Microsoft.Extensions.Diagnostics.HealthChecks;
 
 [JsonSerializable(typeof(OpenIdConfiguration))]
 [JsonSerializable(typeof(RealmCreateRequest))]

IdentityShroud.Api/IdentityShroud.Api.csproj

@@ -17,7 +17,7 @@
     <ItemGroup>
         <PackageReference Include="FluentValidation.DependencyInjectionExtensions" Version="12.1.1" />
         <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="10.0.0"/>
-        <PackageReference Include="Microsoft.Extensions.Configuration.Binder" Version="10.0.2" />
+        <PackageReference Include="Riok.Mapperly" Version="4.3.1" />
         <PackageReference Include="Serilog" Version="4.3.0" />
         <PackageReference Include="Serilog.AspNetCore" Version="10.0.0" />
         <PackageReference Include="Serilog.Expressions" Version="5.0.0" />

IdentityShroud.Api/IdentityShroud.Api.csproj.DotSettings

@@ -1,3 +1,5 @@
 <wpf:ResourceDictionary xml:space="preserve" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:s="clr-namespace:System;assembly=mscorlib" xmlns:ss="urn:shemas-jetbrains-com:settings-storage-xaml" xmlns:wpf="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
 	<s:Boolean x:Key="/Default/CodeInspection/NamespaceProvider/NamespaceFoldersToSkip/=apis_005Cdto/@EntryIndexedValue">True</s:Boolean>
-	<s:Boolean x:Key="/Default/CodeInspection/NamespaceProvider/NamespaceFoldersToSkip/=apis_005Cfilters/@EntryIndexedValue">True</s:Boolean></wpf:ResourceDictionary>
+	<s:Boolean x:Key="/Default/CodeInspection/NamespaceProvider/NamespaceFoldersToSkip/=apis_005Cfilters/@EntryIndexedValue">True</s:Boolean>
+	<s:Boolean x:Key="/Default/CodeInspection/NamespaceProvider/NamespaceFoldersToSkip/=apis_005Cvalidation/@EntryIndexedValue">True</s:Boolean>
+	<s:Boolean x:Key="/Default/CodeInspection/NamespaceProvider/NamespaceFoldersToSkip/=validation/@EntryIndexedValue">True</s:Boolean></wpf:ResourceDictionary>

IdentityShroud.Api/Program.cs

@@ -1,10 +1,10 @@
 using FluentValidation;
 using IdentityShroud.Api;
 using IdentityShroud.Api.Mappers;
-using IdentityShroud.Api.Validation;
 using IdentityShroud.Core;
 using IdentityShroud.Core.Contracts;
 using IdentityShroud.Core.Security;
+using IdentityShroud.Core.Security.Keys;
 using IdentityShroud.Core.Services;
 using Serilog;
 using Serilog.Formatting.Json;
@@ -36,13 +36,21 @@ void ConfigureBuilder(WebApplicationBuilder builder)
     // Learn more about configuring OpenAPI at https://aka.ms/aspnet/openapi
     services.AddOpenApi();
     services.AddScoped<Db>();
+    services.AddScoped<IClientService, ClientService>();
+    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.AddScoped<IRealmService, RealmService>();
     services.AddOptions<DbConfiguration>().Bind(configuration.GetSection("db"));
     services.AddSingleton<ISecretProvider, ConfigurationSecretProvider>();
-    services.AddSingleton<KeyMapper>();
+    services.AddScoped<KeyMapper>();
-    services.AddSingleton<IEncryptionService, EncryptionService>();
+    services.AddScoped<IRealmContext, RealmContext>();
     
     services.AddValidatorsFromAssemblyContaining<RealmCreateRequestValidator>();
+    services.AddHttpContextAccessor();
     
     builder.Host.UseSerilog((context, services, configuration) => configuration
         .Enrich.FromLogContext()
@@ -57,7 +65,8 @@ void ConfigureApplication(WebApplication app)
         app.MapOpenApi();
     }
     app.UseSerilogRequestLogging();
-    app.MapRealmEndpoints();
+    app.MapApis();
+    
     // app.UseRouting();
     // app.MapControllers();
 }

IdentityShroud.Api/Validation/EndpointRouteBuilderExtensions.cs

@@ -1,7 +0,0 @@
-namespace IdentityShroud.Api.Validation;
-
-public static class EndpointRouteBuilderExtensions
-{
-    public static RouteHandlerBuilder Validate<TDto>(this RouteHandlerBuilder builder) where TDto : class
-        => builder.AddEndpointFilter<ValidateFilter<TDto>>();    
-}

IdentityShroud.Core.Tests/Fixtures/DbFixture.cs

@@ -1,5 +1,4 @@
-using DotNet.Testcontainers.Containers;
+using Microsoft.Extensions.Logging.Abstractions;
-using Microsoft.Extensions.Logging.Abstractions;
 using Microsoft.Extensions.Options;
 using Npgsql;
 using Testcontainers.PostgreSql;

IdentityShroud.Core.Tests/Helpers/Base64UrlConverterTests.cs

@@ -0,0 +1,36 @@
+using System.Text;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+using IdentityShroud.Core.Helpers;
+
+namespace IdentityShroud.Core.Tests.Helpers;
+
+public class Base64UrlConverterTests
+{
+    internal class Data
+    {
+        [JsonConverter(typeof(Base64UrlConverter))]
+        public byte[]? X { get; set; }
+    }
+
+    [Fact]
+    public void Serialize()
+    {
+        Data d = new() { X = ">>>???"u8.ToArray() };
+        string s = JsonSerializer.Serialize(d);
+
+        Assert.Contains("\"Pj4-Pz8_\"", s);
+    }
+    
+    [Fact]
+    public void Deerialize()
+    {
+        var jsonstring = """
+            { "X": "Pj4-Pz8_" }
+            """;
+        var d = JsonSerializer.Deserialize<Data>(jsonstring);
+
+        Assert.Equal(">>>???", Encoding.UTF8.GetString(d.X)); 
+    }
+    
+}

IdentityShroud.Core.Tests/JwtSignatureGeneratorTests.cs

@@ -72,8 +72,8 @@ public class JwtSignatureGeneratorTests
         var rsa = RSA.Create();
         var parameters = new RSAParameters
         {
-            Modulus = WebEncoders.Base64UrlDecode(jwk.Modulus),
+            Modulus = WebEncoders.Base64UrlDecode(jwk.Modulus!),
-            Exponent = WebEncoders.Base64UrlDecode(jwk.Exponent)
+            Exponent = WebEncoders.Base64UrlDecode(jwk.Exponent!)
         };
         
         rsa.ImportParameters(parameters);

IdentityShroud.Core.Tests/Model/KeyTests.cs

@@ -1,51 +0,0 @@
-using IdentityShroud.Core.Contracts;
-using IdentityShroud.Core.Model;
-
-namespace IdentityShroud.Core.Tests.Model;
-
-public class KeyTests
-{
-    [Fact]
-    public void SetNewKey()
-    {
-        byte[] privateKey = [5, 6, 7, 8];
-        byte[] encryptedPrivateKey = [1, 2, 3, 4];
-        
-        var encryptionService = Substitute.For<IEncryptionService>();
-        encryptionService
-            .Encrypt(Arg.Any<byte[]>())
-            .Returns(x => encryptedPrivateKey); 
-        
-        Key key = new();
-        key.SetPrivateKey(encryptionService, privateKey);
-
-        // should be able to return original without calling decrypt
-        Assert.Equal(privateKey, key.GetPrivateKey(encryptionService));
-        Assert.Equal(encryptedPrivateKey, key.PrivateKeyEncrypted);
-
-        encryptionService.Received(1).Encrypt(privateKey);
-        encryptionService.DidNotReceive().Decrypt(Arg.Any<byte[]>());
-    }
-    
-    [Fact]
-    public void GetDecryptedKey()
-    {
-        byte[] privateKey = [5, 6, 7, 8];
-        byte[] encryptedPrivateKey = [1, 2, 3, 4];
-        
-        var encryptionService = Substitute.For<IEncryptionService>();
-        encryptionService
-            .Decrypt(encryptedPrivateKey)
-            .Returns(x => privateKey); 
-        
-        Key key = new();
-        key.PrivateKeyEncrypted = encryptedPrivateKey;
-
-        // should be able to return original without calling decrypt
-        Assert.Equal(privateKey, key.GetPrivateKey(encryptionService));
-        Assert.Equal(encryptedPrivateKey, key.PrivateKeyEncrypted);
-
-        encryptionService.Received(1).Decrypt(encryptedPrivateKey);
-    }
-    
-}

IdentityShroud.Core.Tests/Security/AesGcmHelperTests.cs

@@ -1,21 +0,0 @@
-using System.Security.Cryptography;
-using System.Text;
-using IdentityShroud.Core.Security;
-
-namespace IdentityShroud.Core.Tests.Security;
-
-public class AesGcmHelperTests
-{
-    [Fact]
-    public void EncryptDecryptCycleWorks()
-    {
-        string input = "Hello, world!";
-
-        var encryptionKey = RandomNumberGenerator.GetBytes(32);
-
-        var cypher = AesGcmHelper.EncryptAesGcm(Encoding.UTF8.GetBytes(input), encryptionKey);
-        var output = AesGcmHelper.DecryptAesGcm(cypher, encryptionKey);
-        
-        Assert.Equal(input, Encoding.UTF8.GetString(output));
-    }
-}

IdentityShroud.Core.Tests/Security/ConfigurationSecretProviderTests.cs

@@ -0,0 +1,63 @@
+using System.Text;
+using IdentityShroud.Core.Security;
+using Microsoft.Extensions.Configuration;
+
+namespace IdentityShroud.Core.Tests.Security;
+
+public class ConfigurationSecretProviderTests
+{
+    private static IConfiguration BuildConfigFromJson(string json)
+    {
+        // Convert the JSON string into a stream that the config builder can read.
+        var jsonBytes = Encoding.UTF8.GetBytes(json);
+        using var stream = new MemoryStream(jsonBytes);
+
+        // Build the configuration just like the real app does, but from the stream.
+        var config = new ConfigurationBuilder()
+            .AddJsonStream(stream)   // <-- reads from the in‑memory JSON
+            .Build();
+
+        return config;
+    }
+
+    [Fact]
+    public void Test()
+    {
+        string jsonConfig = """
+            {
+                "secrets": {
+                    "master": [
+                        {
+                            "Id": "5676d159-5495-4945-aa84-59ee694aa8a2",
+                            "Active": true,
+                            "Algorithm": "AES",
+                            "Key": "yoQ4W7EaNjo7s3FBYkWo5BLyX1BnLyWd7BlSaDIrkzo="
+                        },
+                        {
+                            "Id": "b82489e7-a05a-4d64-b9a5-58d2f2c0dc39",
+                            "Active": false,
+                            "Algorithm": "AES",
+                            "Key": "YSWK6vTJXCJOGLpCo+TtZ6anKNzvA1VT2xXLHbmq4M0="
+                        }
+                    ]    
+                }
+            }
+            """;
+        
+
+        ConfigurationSecretProvider sut = new(BuildConfigFromJson(jsonConfig));
+
+        // act
+        var keys = sut.GetKeys("master");
+
+        // verify
+        Assert.Equal(2, keys.Length);
+        var active = keys.Single(k => k.Active);
+        Assert.Equal(new Guid("5676d159-5495-4945-aa84-59ee694aa8a2"), active.Id.Id);
+        Assert.Equal("AES", active.Algorithm);
+        Assert.Equal(Convert.FromBase64String("yoQ4W7EaNjo7s3FBYkWo5BLyX1BnLyWd7BlSaDIrkzo="), active.Key);
+
+        var inactive = keys.Single(k => !k.Active);
+        Assert.Equal(new Guid("b82489e7-a05a-4d64-b9a5-58d2f2c0dc39"), inactive.Id.Id);
+    }
+}

IdentityShroud.Core.Tests/Services/ClientServiceTests.cs

@@ -0,0 +1,155 @@
+using IdentityShroud.Core.Contracts;
+using IdentityShroud.Core.Model;
+using IdentityShroud.Core.Services;
+using IdentityShroud.Core.Tests.Fixtures;
+using IdentityShroud.TestUtils.Substitutes;
+using Microsoft.EntityFrameworkCore;
+
+namespace IdentityShroud.Core.Tests.Services;
+
+public class ClientServiceTests : IClassFixture<DbFixture>
+{
+    private readonly DbFixture _dbFixture;
+    private readonly NullDataEncryptionService _dataEncryptionService = new();
+    
+    private readonly IClock _clock = Substitute.For<IClock>();
+    private readonly Guid _realmId = new("a1b2c3d4-0000-0000-0000-000000000001");
+
+    public ClientServiceTests(DbFixture dbFixture)
+    {
+        _dbFixture = dbFixture;
+        using Db db = dbFixture.CreateDbContext();
+        if (!db.Database.EnsureCreated())
+            TruncateTables(db);
+        EnsureRealm(db);
+    }
+
+    private void TruncateTables(Db db)
+    {
+        db.Database.ExecuteSqlRaw("TRUNCATE client CASCADE;");
+        db.Database.ExecuteSqlRaw("TRUNCATE realm CASCADE;");
+    }
+
+    private void EnsureRealm(Db db)
+    {
+        if (!db.Realms.Any(r => r.Id == _realmId))
+        {
+            db.Realms.Add(new() { Id = _realmId, Slug = "test-realm", Name = "Test Realm" });
+            db.SaveChanges();
+        }
+    }
+
+    [Theory]
+    [InlineData(false)]
+    [InlineData(true)]
+    public async Task Create(bool allowClientCredentialsFlow)
+    {
+        // Setup
+        DateTime now = DateTime.UtcNow;
+        _clock.UtcNow().Returns(now);
+
+        Client val;
+        await using (var db = _dbFixture.CreateDbContext())
+        {
+            // Act
+            ClientService sut = new(db, _dataEncryptionService, _clock);
+            var response = await sut.Create(
+                _realmId,
+                new ClientCreateRequest
+                {
+                    ClientId = "test-client",
+                    Name = "Test Client",
+                    Description = "A test client",
+                    AllowClientCredentialsFlow = allowClientCredentialsFlow,
+                },
+                TestContext.Current.CancellationToken);
+
+            // Verify
+            val = ResultAssert.Success(response);
+            Assert.Equal(_realmId, val.RealmId);
+            Assert.Equal("test-client", val.ClientId);
+            Assert.Equal("Test Client", val.Name);
+            Assert.Equal("A test client", val.Description);
+            Assert.Equal(allowClientCredentialsFlow, val.AllowClientCredentialsFlow);
+            Assert.Equal(now, val.CreatedAt);
+        }
+
+        await using (var db = _dbFixture.CreateDbContext())
+        {
+            var dbRecord = await db.Clients
+                .Include(e => e.Secrets)
+                .SingleAsync(e => e.Id == val.Id, TestContext.Current.CancellationToken);
+
+            if (allowClientCredentialsFlow)
+                Assert.Single(dbRecord.Secrets);
+            else
+                Assert.Empty(dbRecord.Secrets);
+        }
+    }
+
+    [Theory]
+    [InlineData("existing-client", true)]
+    [InlineData("missing-client", false)]
+    public async Task GetByClientId(string clientId, bool shouldFind)
+    {
+        // Setup
+        _clock.UtcNow().Returns(DateTime.UtcNow);
+        await using (var setupContext = _dbFixture.CreateDbContext())
+        {
+            setupContext.Clients.Add(new()
+            {
+                RealmId = _realmId,
+                ClientId = "existing-client",
+                CreatedAt = DateTime.UtcNow,
+            });
+
+            await setupContext.SaveChangesAsync(TestContext.Current.CancellationToken);
+        }
+
+        await using var actContext = _dbFixture.CreateDbContext();
+        // Act
+        ClientService sut = new(actContext, _dataEncryptionService, _clock);
+        Client? result = await sut.GetByClientId(_realmId, clientId, TestContext.Current.CancellationToken);
+
+        // Verify
+        if (shouldFind)
+            Assert.NotNull(result);
+        else
+            Assert.Null(result);
+    }
+
+    [Theory]
+    [InlineData(true)]
+    [InlineData(false)]
+    public async Task FindById(bool shouldFind)
+    {
+        // Setup
+        _clock.UtcNow().Returns(DateTime.UtcNow);
+        int existingId;
+        await using (var setupContext = _dbFixture.CreateDbContext())
+        {
+            Client client = new()
+            {
+                RealmId = _realmId,
+                ClientId = "find-by-id-client",
+                CreatedAt = DateTime.UtcNow,
+            };
+            setupContext.Clients.Add(client);
+            await setupContext.SaveChangesAsync(TestContext.Current.CancellationToken);
+            existingId = client.Id;
+        }
+
+        int searchId = shouldFind ? existingId : existingId + 9999;
+
+        await using var actContext = _dbFixture.CreateDbContext();
+        // Act
+        ClientService sut = new(actContext, _dataEncryptionService, _clock);
+        Client? result = await sut.FindById(_realmId, searchId, TestContext.Current.CancellationToken);
+
+        // Verify
+        if (shouldFind)
+            Assert.NotNull(result);
+        else
+            Assert.Null(result);
+    }
+}

IdentityShroud.Core.Tests/Services/DataEncryptionServiceTests.cs

@@ -0,0 +1,64 @@
+using System.Security.Cryptography;
+using IdentityShroud.Core.Contracts;
+using IdentityShroud.Core.Model;
+using IdentityShroud.Core.Security;
+using IdentityShroud.Core.Services;
+using IdentityShroud.TestUtils.Substitutes;
+
+namespace IdentityShroud.Core.Tests.Services;
+
+public class DataEncryptionServiceTests
+{
+    private readonly IRealmContext _realmContext = Substitute.For<IRealmContext>();
+    private readonly IDekEncryptionService _dekCryptor = new NullDekEncryptionService();// Substitute.For<IDekEncryptionService>();
+
+    private readonly DekId _activeDekId = DekId.NewId();
+    private readonly DekId _secondDekId = DekId.NewId();
+    private DataEncryptionService CreateSut()
+        => new(_realmContext, _dekCryptor);
+
+    [Fact]
+    public void Encrypt_UsesActiveKey()
+    {
+        _realmContext.GetDeks(Arg.Any<CancellationToken>()).Returns([
+            CreateRealmDek(_secondDekId, false),
+            CreateRealmDek(_activeDekId, true),
+        ]);
+
+        var cipher = CreateSut().Encrypt("Hello"u8);
+        
+        Assert.Equal(_activeDekId, cipher.DekId);
+    }
+
+    [Fact]
+    public void Decrypt_UsesCorrectKey()
+    {
+        var first = CreateRealmDek(_activeDekId, true);
+        _realmContext.GetDeks(Arg.Any<CancellationToken>()).Returns([ first ]);
+
+        var sut = CreateSut();
+        var cipher = sut.Encrypt("Hello"u8);
+
+        // Deactivate original key
+        first.Active = false;
+        // Make new active
+        var second = CreateRealmDek(_secondDekId, true);
+        // Return both
+        _realmContext.GetDeks(Arg.Any<CancellationToken>()).Returns([ first, second ]);
+
+
+        var decoded = sut.Decrypt(cipher);
+
+        Assert.Equal("Hello"u8, decoded);
+    }
+    
+    private RealmDek CreateRealmDek(DekId id, bool active)
+        => new()
+        {
+            Id = id,
+            Active = active,
+            Algorithm = "AES",
+            KeyData = new(KekId.NewId(), RandomNumberGenerator.GetBytes(32)),
+            RealmId = default,
+        };
+}

IdentityShroud.Core.Tests/Services/DekEncryptionServiceTests.cs

@@ -0,0 +1,123 @@
+using IdentityShroud.Core.Contracts;
+using IdentityShroud.Core.Security;
+using IdentityShroud.Core.Services;
+
+namespace IdentityShroud.Core.Tests.Services;
+
+public class DekEncryptionServiceTests
+{
+    [Fact]
+    public void RoundtripWorks()
+    {
+        // Note this code will tend to only test the latest verion.
+
+        // setup
+        byte[] keyValue = Convert.FromBase64String("IGd9yUMusjNW0ezv8ink3QWlAHKFH45d21LyrbJTokw=");
+        var secretProvider = Substitute.For<ISecretProvider>();
+        KeyEncryptionKey[] keys =
+        [
+            new KeyEncryptionKey(KekId.NewId(), true, "AES", keyValue)
+        ];
+        secretProvider.GetKeys("master").Returns(keys);
+        
+            
+        ReadOnlySpan<byte> input = "Hello, World!"u8;
+        
+        // act
+        DekEncryptionService sut = new(secretProvider);
+        EncryptedDek cipher = sut.Encrypt(input.ToArray());
+        byte[] result = sut.Decrypt(cipher);
+
+        // verify
+        Assert.Equal(input, result);
+    }
+
+    [Fact]
+    public void DetectsCorruptInput()
+    {
+        // When introducing a new version we need version specific tests to 
+        // make sure decoding of legacy data still works.
+        KekId kid = KekId.NewId();
+        // setup
+        byte[] cipher = // NOTE INCORRECT CIPHER DO NOT USE IN OTHER TESTS
+        [
+            1, 198, 55, 58, 56, 110, 238, 59, 158, 214, 85, 241, 26, 44, 140, 229, 128, 111, 167, 154, 160, 177, 152,
+            193, 75, 4, 235, 82, 207, 87, 32, 10, 239, 4, 246, 25, 21, 249, 25, 59, 160, 101
+        ];
+        EncryptedDek secret = new(kid, cipher);
+        
+        byte[] keyValue = Convert.FromBase64String("IGd9yUMusjNW0ezv8ink3QWlAHKFH45d21LyrbJTokw=");
+        var secretProvider = Substitute.For<ISecretProvider>();
+        KeyEncryptionKey[] keys =
+        [
+            new KeyEncryptionKey(kid, true, "AES", keyValue)
+        ];
+        secretProvider.GetKeys("master").Returns(keys);
+
+        // act
+        DekEncryptionService sut = new(secretProvider);
+        Assert.Throws<InvalidOperationException>(
+            () => sut.Decrypt(secret),
+            ex => ex.Message.Contains("Decryption failed") ? null : "Expected Decryption failed in message");
+    }
+
+    [Fact]
+    public void DecodeSelectsRightKey()
+    {
+        // The key is marked inactive also it is the second key
+        
+        // setup
+        KekId kid1 = KekId.NewId();
+        KekId kid2 = KekId.NewId();
+
+        byte[] cipher =
+        [
+            1, 198, 55, 58, 56, 110, 238, 59, 158, 214, 85, 241, 26, 44, 140, 229, 128, 111, 167, 154, 160, 177, 152,
+            193, 74, 4, 235, 82, 207, 87, 32, 10, 239, 4, 246, 25, 21, 249, 25, 59, 160, 101
+        ];
+        EncryptedDek secret = new(kid1, cipher);
+        
+        byte[] keyValue1 = Convert.FromBase64String("IGd9yUMusjNW0ezv8ink3QWlAHKFH45d21LyrbJTokw=");
+        byte[] keyValue2 = Convert.FromBase64String("Dat1RwRvuLX3wdKMMP4NwHdBl8tJJsKfp01qikyo8aw=");
+        var secretProvider = Substitute.For<ISecretProvider>();
+        KeyEncryptionKey[] keys =
+        [
+            new KeyEncryptionKey(kid2, true, "AES", keyValue2),
+            new KeyEncryptionKey(kid1, false, "AES", keyValue1),
+        ];
+        secretProvider.GetKeys("master").Returns(keys);
+
+        // act
+        DekEncryptionService sut = new(secretProvider);
+        byte[] result = sut.Decrypt(secret);
+
+        // verify
+        Assert.Equal("Hello, World!"u8, result);
+    }
+    
+    [Fact]
+    public void EncryptionUsesActiveKey()
+    {
+        // setup
+        KekId kid1 = KekId.NewId();
+        KekId kid2 = KekId.NewId();
+
+        byte[] keyValue1 = Convert.FromBase64String("IGd9yUMusjNW0ezv8ink3QWlAHKFH45d21LyrbJTokw=");
+        byte[] keyValue2 = Convert.FromBase64String("Dat1RwRvuLX3wdKMMP4NwHdBl8tJJsKfp01qikyo8aw=");
+        var secretProvider = Substitute.For<ISecretProvider>();
+        KeyEncryptionKey[] keys =
+        [
+            new KeyEncryptionKey(kid1, false, "AES", keyValue1),
+            new KeyEncryptionKey(kid2, true, "AES", keyValue2),
+        ];
+        secretProvider.GetKeys("master").Returns(keys);
+
+        ReadOnlySpan<byte> input = "Hello, World!"u8;
+        // act
+        DekEncryptionService sut = new(secretProvider);
+        EncryptedDek cipher = sut.Encrypt(input.ToArray());
+        
+        // Verify
+        Assert.Equal(kid2, cipher.KekId);
+    }
+}

IdentityShroud.Core.Tests/Services/EncryptionServiceTests.cs

@@ -1,26 +0,0 @@
-using System.Security.Cryptography;
-using IdentityShroud.Core.Contracts;
-using IdentityShroud.Core.Services;
-
-namespace IdentityShroud.Core.Tests.Services;
-
-public class EncryptionServiceTests
-{
-    [Fact]
-    public void RoundtripWorks()
-    {
-        // setup
-        string key = Convert.ToBase64String(RandomNumberGenerator.GetBytes(32));
-        var secretProvider = Substitute.For<ISecretProvider>();
-        secretProvider.GetSecret("Master").Returns(key);
-            
-        EncryptionService sut = new(secretProvider);
-        byte[] input = RandomNumberGenerator.GetBytes(16);
-        
-        // act
-        var cipher = sut.Encrypt(input);
-        var result = sut.Decrypt(cipher);
-
-        Assert.Equal(input, result);
-    }
-}

IdentityShroud.Core.Tests/Services/EncryptionTests.cs

@@ -0,0 +1,30 @@
+using IdentityShroud.Core.Security;
+using IdentityShroud.Core.Services;
+
+namespace IdentityShroud.Core.Tests.Services;
+
+public class EncryptionTests
+{
+    [Fact]
+    public void DecodeV1_Success()
+    {
+        // When introducing a new version we need version specific tests to 
+        // make sure decoding of legacy data still works.
+        
+        // setup
+        byte[] cipher =
+        [
+            1, 198, 55, 58, 56, 110, 238, 59, 158, 214, 85, 241, 26, 44, 140, 229, 128, 111, 167, 154, 160, 177, 152,
+            193, 74, 4, 235, 82, 207, 87, 32, 10, 239, 4, 246, 25, 21, 249, 25, 59, 160, 101
+        ];
+        byte[] keyValue = Convert.FromBase64String("IGd9yUMusjNW0ezv8ink3QWlAHKFH45d21LyrbJTokw=");
+        
+        // act
+        byte[] result = Encryption.Decrypt(cipher, keyValue);
+
+        // verify
+        Assert.Equal("Hello, World!"u8, result);
+    }
+
+    
+}

IdentityShroud.Core.Tests/Services/RealmServiceTests.cs

@@ -1,7 +1,9 @@
 using IdentityShroud.Core.Contracts;
+using IdentityShroud.Core.Model;
+using IdentityShroud.Core.Security;
+using IdentityShroud.Core.Security.Keys;
 using IdentityShroud.Core.Services;
 using IdentityShroud.Core.Tests.Fixtures;
-using IdentityShroud.TestUtils.Substitutes;
 using Microsoft.EntityFrameworkCore;
 
 namespace IdentityShroud.Core.Tests.Services;
@@ -9,7 +11,7 @@ namespace IdentityShroud.Core.Tests.Services;
 public class RealmServiceTests : IClassFixture<DbFixture>
 {
     private readonly DbFixture _dbFixture;
-    private readonly IEncryptionService _encryptionService = EncryptionServiceSubstitute.CreatePassthrough();
+    private readonly IKeyService _keyService = Substitute.For<IKeyService>();
 
     public RealmServiceTests(DbFixture dbFixture)
     {
@@ -34,25 +36,43 @@ public class RealmServiceTests : IClassFixture<DbFixture>
         if (idString is not null)
             realmId = new(idString);
 
-        using Db db = _dbFixture.CreateDbContext();
+        RealmCreateResponse? val;
-        RealmService sut = new(db, _encryptionService);
+        await using (var db = _dbFixture.CreateDbContext())
-        // Act
+        {
+            _keyService.CreateKey(Arg.Any<KeyPolicy>())
+                .Returns(new RealmKey() 
+                { 
+                    Id = Guid.NewGuid(), 
+                    KeyType = "TST", 
+                    Key = new(KekId.NewId(), [21]),
+                    CreatedAt = DateTime.UtcNow
+                });
+            // Act
+            RealmService sut = new(db, _keyService);
+            var response = await sut.Create(
+                new(realmId, "slug", "New realm"),
+                TestContext.Current.CancellationToken);
 
-        var response = await sut.Create(
+            // Verify
-            new(realmId, "slug", "New realm"),
+            val = ResultAssert.Success(response);
-            TestContext.Current.CancellationToken);
+            if (realmId.HasValue)
+                Assert.Equal(realmId, val.Id);
+            else
+                Assert.NotEqual(Guid.Empty, val.Id);
 
-        // Verify
+            Assert.Equal("slug", val.Slug);
-        RealmCreateResponse val = ResultAssert.Success(response);
+            Assert.Equal("New realm", val.Name);
-        if (realmId.HasValue)
-            Assert.Equal(realmId, val.Id);
-        else
-            Assert.NotEqual(Guid.Empty, val.Id);
 
-        Assert.Equal("slug", val.Slug);
+            _keyService.Received().CreateKey(Arg.Any<KeyPolicy>());
-        Assert.Equal("New realm", val.Name);
+        }
 
-        // TODO verify data has been stored!
+        await using (var db = _dbFixture.CreateDbContext())
+        {
+            var dbRecord = await db.Realms
+                .Include(e => e.Keys)
+                .SingleAsync(e => e.Id == val.Id, TestContext.Current.CancellationToken);
+            Assert.Equal("TST", dbRecord.Keys[0].KeyType);
+        }
     }
 
     [Theory]
@@ -60,7 +80,7 @@ public class RealmServiceTests : IClassFixture<DbFixture>
     [InlineData("foo", "Foo")]
     public async Task FindBySlug(string slug, string? name)
     {
-        using (var setupContext = _dbFixture.CreateDbContext())
+        await using (var setupContext = _dbFixture.CreateDbContext())
         {
             setupContext.Realms.Add(new()
             {
@@ -76,11 +96,48 @@ public class RealmServiceTests : IClassFixture<DbFixture>
             await setupContext.SaveChangesAsync(TestContext.Current.CancellationToken);
         }
 
-        using Db actContext = _dbFixture.CreateDbContext();
+        await using var actContext = _dbFixture.CreateDbContext();
-        RealmService sut = new(actContext, _encryptionService);
         // Act
+        RealmService sut = new(actContext, _keyService);
         var result = await sut.FindBySlug(slug, TestContext.Current.CancellationToken);
 
+        // Verify
         Assert.Equal(name, result?.Name);
     }
+
+    [Theory]
+    [InlineData("b0423bba-2411-497b-a5b6-c5adf404b862", true)]
+    [InlineData("65ac9dba-6d43-4fa4-b57f-133ed639fbcb", false)]
+    public async Task FindById(string idString, bool shouldFind)
+    {
+        Guid id = new(idString);
+        await using (var setupContext = _dbFixture.CreateDbContext())
+        {
+            setupContext.Realms.Add(new()
+            {
+                Id = new("b0423bba-2411-497b-a5b6-c5adf404b862"),
+                Slug = "foo",
+                Name = "Foo",
+            });
+            setupContext.Realms.Add(new()
+            {
+                Id = new("d4ffc7d0-7b2c-4f02-82b9-a74610435b0d"),
+                Slug = "bar",
+                Name = "Bar",
+            });
+            
+            await setupContext.SaveChangesAsync(TestContext.Current.CancellationToken);
+        }
+
+        await using var actContext = _dbFixture.CreateDbContext();
+        // Act
+        RealmService sut = new(actContext, _keyService);
+        Realm? result = await sut.FindById(id, TestContext.Current.CancellationToken);
+
+        // Verify
+        if (shouldFind)
+            Assert.NotNull(result);
+        else 
+            Assert.Null(result);
+    }
 }

IdentityShroud.Core.Tests/UnitTest1.cs

@@ -2,7 +2,6 @@
 using System.Text;
 using System.Text.Json;
 using IdentityShroud.Core.DTO;
-using IdentityShroud.Core.Messages;
 using Microsoft.AspNetCore.WebUtilities;
 
 namespace IdentityShroud.Core.Tests;
@@ -36,7 +35,6 @@ public class UnitTest1
             
             // Option 3: Generate a new key for testing
             rsa.KeySize = 2048;
-            
             // Your already encoded header and payload
             string header = "eyJhbGciOiJSUzI1NiIsInR5cCIgOiAiSldUIiwia2lkIiA6ICJybVZ3TU5rM0o1WHlmMWhyS3NVbEVYN1BNUm42dlZKY0h3U3FYMUVQRnFJIn0";
             string payload = "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";
@@ -52,6 +50,15 @@ public class UnitTest1
             // Or generate complete JWT
             // string completeJwt = JwtSignatureGenerator.GenerateCompleteJwt(header, payload, rsa);
             // Console.WriteLine($"Complete JWT: {completeJwt}");
+
+            rsa.ExportRSAPublicKey(); // PKCS#1
+        }
+
+        using (ECDsa dsa = ECDsa.Create())
+        {
+            dsa.ExportPkcs8PrivateKey();
+
+            dsa.ExportSubjectPublicKeyInfo(); // x509
         }
     }        
 }
@@ -67,9 +74,9 @@ public static class JwtReader
         return new JsonWebToken()
         {
             Header = JsonSerializer.Deserialize<JsonWebTokenHeader>(
-                Encoding.UTF8.GetString(WebEncoders.Base64UrlDecode(jwt, 0, firstDot))),
+                Encoding.UTF8.GetString(WebEncoders.Base64UrlDecode(jwt, 0, firstDot)))!,
             Payload = JsonSerializer.Deserialize<JsonWebTokenPayload>(
-                Encoding.UTF8.GetString(WebEncoders.Base64UrlDecode(jwt, firstDot + 1, secondDot - (firstDot + 1)))),
+                Encoding.UTF8.GetString(WebEncoders.Base64UrlDecode(jwt, firstDot + 1, secondDot - (firstDot + 1))))!,
             Signature = WebEncoders.Base64UrlDecode(jwt, secondDot + 1, jwt.Length - (secondDot + 1))
         };
     }

IdentityShroud.Core/Contracts/IClientService.cs

@@ -0,0 +1,14 @@
+using IdentityShroud.Core.Model;
+
+namespace IdentityShroud.Core.Contracts;
+
+public interface IClientService
+{
+    Task<Result<Client>> Create(
+        Guid realmId,
+        ClientCreateRequest request, 
+        CancellationToken ct = default);
+
+    Task<Client?> GetByClientId(Guid realmId, string clientId, CancellationToken ct = default);
+    Task<Client?> FindById(Guid realmId, int id, CancellationToken ct = default);
+}

IdentityShroud.Core/Contracts/IClock.cs

@@ -0,0 +1,6 @@
+namespace IdentityShroud.Core.Contracts;
+
+public interface IClock
+{
+    DateTime UtcNow();
+}

IdentityShroud.Core/Contracts/IDataEncryptionService.cs

@@ -0,0 +1,9 @@
+using IdentityShroud.Core.Security;
+
+namespace IdentityShroud.Core.Contracts;
+
+public interface IDataEncryptionService
+{
+    EncryptedValue Encrypt(ReadOnlySpan<byte> plain);
+    byte[] Decrypt(EncryptedValue input);
+}

IdentityShroud.Core/Contracts/IDekEncryptionService.cs

@@ -0,0 +1,11 @@
+using IdentityShroud.Core.Security;
+
+namespace IdentityShroud.Core.Contracts;
+
+
+
+public interface IDekEncryptionService
+{
+    EncryptedDek Encrypt(ReadOnlySpan<byte> plain);
+    byte[] Decrypt(EncryptedDek input);
+}

IdentityShroud.Core/Contracts/IEncryptionService.cs

@@ -1,7 +0,0 @@
-namespace IdentityShroud.Core.Contracts;
-
-public interface IEncryptionService
-{
-    byte[] Encrypt(byte[] plain);
-    byte[] Decrypt(byte[] cipher);
-}

IdentityShroud.Core/Contracts/IKeyService.cs

@@ -0,0 +1,12 @@
+using IdentityShroud.Core.Messages;
+using IdentityShroud.Core.Model;
+using IdentityShroud.Core.Security.Keys;
+
+namespace IdentityShroud.Core.Contracts;
+
+public interface IKeyService
+{
+    RealmKey CreateKey(KeyPolicy policy);
+
+    JsonWebKey? CreateJsonWebKey(RealmKey realmKey);
+}

IdentityShroud.Core/Contracts/IRealmContext.cs

@@ -0,0 +1,9 @@
+using IdentityShroud.Core.Model;
+
+namespace IdentityShroud.Core.Contracts;
+
+public interface IRealmContext
+{
+    public Realm GetRealm();
+    Task<IList<RealmDek>> GetDeks(CancellationToken ct = default);
+}

IdentityShroud.Core/Contracts/IRealmService.cs

@@ -1,12 +1,15 @@
 using IdentityShroud.Core.Messages.Realm;
 using IdentityShroud.Core.Model;
+using IdentityShroud.Core.Services;
 
-namespace IdentityShroud.Core.Services;
+namespace IdentityShroud.Core.Contracts;
 
 public interface IRealmService
 {
+    Task<Realm?> FindById(Guid id, CancellationToken ct = default);
     Task<Realm?> FindBySlug(string slug, CancellationToken ct = default);
         
     Task<Result<RealmCreateResponse>> Create(RealmCreateRequest request, CancellationToken ct = default);
     Task LoadActiveKeys(Realm realm);
+    Task LoadDeks(Realm realm);
 }

IdentityShroud.Core/Contracts/ISecretProvider.cs

@@ -1,6 +1,14 @@
+using IdentityShroud.Core.Security;
+
 namespace IdentityShroud.Core.Contracts;
 
 public interface ISecretProvider
 {
     string GetSecret(string name);
+
+    /// <summary>
+    /// Should return one active key, might return inactive keys.
+    /// </summary>
+    /// <returns></returns>
+    KeyEncryptionKey[] GetKeys(string name);
 }

IdentityShroud.Core/DTO/Client/ClientCreateRequest.cs

@@ -0,0 +1,10 @@
+namespace IdentityShroud.Core.Contracts;
+
+public class ClientCreateRequest
+{
+    public required string ClientId { get; set; }
+    public string? Name { get; set; }
+    public string? Description { get; set; }
+    public string? SignatureAlgorithm { get; set; }
+    public bool? AllowClientCredentialsFlow { get; set; }
+}

IdentityShroud.Core/DTO/JsonWebKey.cs

@@ -1,4 +1,5 @@
 using System.Text.Json.Serialization;
+using IdentityShroud.Core.Helpers;
 
 namespace IdentityShroud.Core.Messages;
 
@@ -25,17 +26,24 @@ public class JsonWebKey
     
     // RSA Public Key Components
     [JsonPropertyName("n")]
-    public required string Modulus { get; set; }
+    public string? Modulus { get; set; }
     
     [JsonPropertyName("e")]
-    public required string Exponent { get; set; }
+    public string? Exponent { get; set; }
+    
+    // ECdsa
+    public string? Curve { get; set; }
+    [JsonConverter(typeof(Base64UrlConverter))]
+    public byte[]? X { get; set; }
+    [JsonConverter(typeof(Base64UrlConverter))]
+    public byte[]? Y { get; set; }
     
     // Optional fields
-    [JsonPropertyName("x5c")]
+    // [JsonPropertyName("x5c")]
-    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
+    // [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
-    public List<string>? X509CertificateChain { get; set; }
+    // public List<string>? X509CertificateChain { get; set; }
-    
+    //
-    [JsonPropertyName("x5t")]
+    // [JsonPropertyName("x5t")]
-    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
+    // [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
-    public string? X509CertificateThumbprint { get; set; }    
+    // public string? X509CertificateThumbprint { get; set; }    
 }

IdentityShroud.Core/Db.cs

@@ -1,5 +1,7 @@
 using IdentityShroud.Core.Model;
+using IdentityShroud.Core.Security;
 using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
 
@@ -16,8 +18,43 @@ public class Db(
     ILoggerFactory? loggerFactory) 
     : DbContext
 {
+    public virtual DbSet<Client> Clients { get; set; }
     public virtual DbSet<Realm> Realms { get; set; }
-    public virtual DbSet<Key> Keys { get; set; }
+    public virtual DbSet<RealmKey> Keys { get; set; }
+    public virtual DbSet<RealmDek> Deks { get; set; }
+
+    protected override void OnModelCreating(ModelBuilder modelBuilder)
+    {
+        var dekIdConverter = new ValueConverter<DekId, Guid>(
+            id => id.Id,
+            guid => new DekId(guid));
+
+        var kekIdConverter = new ValueConverter<KekId, Guid>(
+            id => id.Id,
+            guid => new KekId(guid));
+
+        modelBuilder.Entity<RealmDek>()
+            .Property(d => d.Id)
+            .HasConversion(dekIdConverter);
+
+        modelBuilder.Entity<RealmDek>()
+            .OwnsOne(d => d.KeyData, keyData =>
+            {
+                keyData.Property(k => k.KekId).HasConversion(kekIdConverter);
+            });
+
+        modelBuilder.Entity<RealmKey>()
+            .OwnsOne(k => k.Key, key =>
+            {
+                key.Property(k => k.KekId).HasConversion(kekIdConverter);
+            });
+
+        modelBuilder.Entity<ClientSecret>()
+            .OwnsOne(c => c.Secret, secret =>
+            {
+                secret.Property(s => s.DekId).HasConversion(dekIdConverter);
+            });
+    }
 
     protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
     {

IdentityShroud.Core/Helpers/Base64UrlConverter.cs

@@ -0,0 +1,28 @@
+using System.Buffers;
+using System.Buffers.Text;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace IdentityShroud.Core.Helpers;
+
+public class Base64UrlConverter : JsonConverter<byte[]>
+{
+    public override byte[] Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+    {
+        // GetValueSpan gives you the raw UTF-8 bytes of the JSON string value
+        if (reader.HasValueSequence)
+        {
+            var valueSequence = reader.ValueSequence.ToArray();
+            return Base64Url.DecodeFromUtf8(valueSequence);
+        }
+        return Base64Url.DecodeFromUtf8(reader.ValueSpan);
+    }
+
+    public override void Write(Utf8JsonWriter writer, byte[] value, JsonSerializerOptions options)
+    {
+        int encodedLength = Base64Url.GetEncodedLength(value.Length);
+        Span<byte> buffer = encodedLength <= 256 ? stackalloc byte[encodedLength] : new byte[encodedLength];
+        Base64Url.EncodeToUtf8(value, buffer);
+        writer.WriteStringValue(buffer);
+    }
+}

IdentityShroud.Core/Helpers/SlugHelper.cs

@@ -1,4 +1,3 @@
-using System;
 using System.Globalization;
 using System.Security.Cryptography;
 using System.Text;

IdentityShroud.Core/IdentityShroud.Core.csproj

@@ -11,7 +11,10 @@
       <PackageReference Include="FluentResults" Version="4.0.0" />
       <PackageReference Include="FluentValidation" Version="12.1.1" />
       <PackageReference Include="jose-jwt" Version="5.2.0" />
+      <PackageReference Include="LanguageExt.Core" Version="4.4.9" />
+      <PackageReference Include="Microsoft.AspNetCore.Http.Abstractions" Version="2.3.9" />
       <PackageReference Include="Microsoft.Extensions.Configuration.Binder" Version="10.0.2" />
+      <PackageReference Include="Microsoft.AspNetCore.WebUtilities" Version="10.0.2" />
       <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="10.0.0" />
     </ItemGroup>
     
@@ -19,10 +22,4 @@
         <Using Include="FluentResults" />
     </ItemGroup>
 
-    <ItemGroup>
-      <Reference Include="Microsoft.AspNetCore.WebUtilities">
-        <HintPath>..\..\..\.nuget\packages\microsoft.aspnetcore.webutilities\10.0.2\lib\net10.0\Microsoft.AspNetCore.WebUtilities.dll</HintPath>
-      </Reference>
-    </ItemGroup>
-
 </Project>

IdentityShroud.Core/Model/Client.cs

@@ -1,11 +1,29 @@
-using IdentityShroud.Core.Security;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+using Microsoft.EntityFrameworkCore;
 
 namespace IdentityShroud.Core.Model;
 
+[Table("client")]
+[Index(nameof(ClientId), IsUnique = true)]
 public class Client
 {
-    public Guid Id { get; set; }
+    [Key]
-    public string Name { get; set; }
+    public int Id { get; set; }
+    public Guid RealmId { get; set; }
+    [MaxLength(40)]
+    public required string ClientId { get; set; }
+    [MaxLength(80)]
+    public string? Name { get; set; }
+    [MaxLength(2048)]
+    public string? Description { get; set; }
     
-    public string? SignatureAlgorithm { get; set; } = JsonWebAlgorithm.RS256;
+    [MaxLength(20)]
+    public string? SignatureAlgorithm { get; set; }
+    
+    public bool AllowClientCredentialsFlow { get; set; } = false;
+    
+    public required DateTime CreatedAt { get; set; }
+
+    public List<ClientSecret> Secrets { get; set; } = [];
 }

IdentityShroud.Core/Model/ClientSecret.cs

@@ -0,0 +1,17 @@
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+using IdentityShroud.Core.Contracts;
+using IdentityShroud.Core.Security;
+
+namespace IdentityShroud.Core.Model;
+
+[Table("client_secret")]
+public class ClientSecret
+{
+    [Key]
+    public int Id { get; set; }
+    public Guid ClientId { get; set; }
+    public DateTime CreatedAt { get; set; }
+    public DateTime? RevokedAt { get; set; }
+    public required EncryptedValue Secret { get; set; }
+}

IdentityShroud.Core/Model/Key.cs

@@ -1,45 +0,0 @@
-using System.ComponentModel.DataAnnotations.Schema;
-using IdentityShroud.Core.Contracts;
-
-namespace IdentityShroud.Core.Model;
-
-
-[Table("key")]
-public class Key
-{
-    private byte[] _privateKeyDecrypted = [];
-
-    public Guid Id { get; set; }
-    
-    public DateTime CreatedAt { get; set; }
-    public DateTime? DeactivatedAt { get; set; }
-
-    /// <summary>
-    /// Key with highest priority will be used. While there is not really a use case for this I know some users
-    /// are more comfortable replacing keys by using priority then directly deactivating the old key.
-    /// </summary>
-    public int Priority { get; set; } = 10;
-    
-    public byte[] PrivateKeyEncrypted
-    {
-        get;
-        set
-        {
-            field = value;
-            _privateKeyDecrypted = [];
-        }
-    } = [];
-
-    public byte[] GetPrivateKey(IEncryptionService encryptionService)
-    {
-        if (_privateKeyDecrypted.Length == 0 && PrivateKeyEncrypted.Length > 0)
-            _privateKeyDecrypted = encryptionService.Decrypt(PrivateKeyEncrypted);
-        return _privateKeyDecrypted;
-    }
-
-    public void SetPrivateKey(IEncryptionService encryptionService, byte[] privateKey)
-    {
-        PrivateKeyEncrypted = encryptionService.Encrypt(privateKey);
-        _privateKeyDecrypted = privateKey;
-    }
-}

IdentityShroud.Core/Model/Realm.cs

@@ -1,7 +1,6 @@
 using System.ComponentModel.DataAnnotations;
 using System.ComponentModel.DataAnnotations.Schema;
 using IdentityShroud.Core.Security;
-using Microsoft.EntityFrameworkCore;
 
 namespace IdentityShroud.Core.Model;
 
@@ -20,11 +19,22 @@ public class Realm
     public string Name { get; set; } = "";
     public List<Client> Clients { get; init; } = [];
 
-    public List<Key> Keys { get; init; } = [];
+    public List<RealmKey> Keys { get; init; } = [];
+
+    public List<RealmDek> Deks { get; init; } = [];
 
     /// <summary>
     /// Can be overriden per client
     /// </summary>
     public string DefaultSignatureAlgorithm { get; set; } = JsonWebAlgorithm.RS256;
-    
+}
+
+[Table("realm_dek")]
+public record RealmDek
+{
+    public required DekId Id { get; init; }
+    public required bool Active { get; set; }
+    public required string Algorithm { get; init; }
+    public required EncryptedDek KeyData { get; init; }
+    public required Guid RealmId { get; init; }
 }

IdentityShroud.Core/Model/RealmKey.cs

@@ -0,0 +1,27 @@
+using System.ComponentModel.DataAnnotations.Schema;
+using IdentityShroud.Core.Contracts;
+using IdentityShroud.Core.Security;
+using Microsoft.EntityFrameworkCore;
+
+namespace IdentityShroud.Core.Model;
+
+
+[Table("realm_key")]
+public record RealmKey
+{
+    public required Guid Id { get; init; }
+    public required string KeyType { get; init; }
+
+    
+    public required EncryptedDek Key { get; init; }
+    public required DateTime CreatedAt { get; init; }
+    public DateTime? RevokedAt { get; set; }
+
+    /// <summary>
+    /// Key with highest priority will be used. While there is not really a use case for this I know some users
+    /// are more comfortable replacing keys by using priority then directly deactivating the old key.
+    /// </summary>
+    public int Priority { get; set; } = 10;
+    
+
+}

IdentityShroud.Core/Security/AesGcmHelper.cs

@@ -1,71 +0,0 @@
-using System.Security.Cryptography;
-
-namespace IdentityShroud.Core.Security;
-
-public static class AesGcmHelper
-{
-    
-    public static byte[] EncryptAesGcm(byte[] plaintext, byte[] key)
-    {
-        int tagSize = AesGcm.TagByteSizes.MaxSize;
-        using var aes = new AesGcm(key, tagSize);
-        
-        Span<byte> nonce = stackalloc byte[AesGcm.NonceByteSizes.MaxSize];
-        RandomNumberGenerator.Fill(nonce);
-        Span<byte> ciphertext = stackalloc byte[plaintext.Length];
-        Span<byte> tag = stackalloc byte[tagSize];
-
-        aes.Encrypt(nonce, plaintext, ciphertext, tag);
-
-        // Return concatenated nonce|ciphertext|tag
-        var result = new byte[nonce.Length + ciphertext.Length + tag.Length];
-        nonce.CopyTo(result.AsSpan(0, nonce.Length));
-        ciphertext.CopyTo(result.AsSpan(nonce.Length, ciphertext.Length));
-        tag.CopyTo(result.AsSpan(nonce.Length + ciphertext.Length, tag.Length));
-        return result;
-    }
-    
-    // --------------------------------------------------------------------
-    // DecryptAesGcm
-    //   • key      – 32‑byte (256‑bit) secret key (same key used for encryption)
-    //   • payload  – byte[] containing nonce‖ciphertext‖tag
-    //   • returns  – the original plaintext bytes
-    // --------------------------------------------------------------------
-    public static byte[] DecryptAesGcm(byte[] payload, byte[] key)
-    {
-        if (payload == null) throw new ArgumentNullException(nameof(payload));
-        if (key == null)     throw new ArgumentNullException(nameof(key));
-        if (key.Length != 32) // 256‑bit key
-            throw new ArgumentException("Key must be 256 bits (32 bytes) for AES‑256‑GCM.", nameof(key));
-
-        // ----------------------------------------------------------------
-        // 1️⃣ Extract the three components.
-        // ----------------------------------------------------------------
-        // AesGcm.NonceByteSizes.MaxSize = 12 bytes (standard GCM nonce length)
-        // AesGcm.TagByteSizes.MaxSize   = 16 bytes (128‑bit authentication tag)
-        int nonceSize = AesGcm.NonceByteSizes.MaxSize; // 12
-        int tagSize   = AesGcm.TagByteSizes.MaxSize;   // 16
-
-        if (payload.Length < nonceSize + tagSize)
-            throw new ArgumentException("Payload is too short to contain nonce, ciphertext, and tag.", nameof(payload));
-
-        ReadOnlySpan<byte> nonce = new(payload, 0, nonceSize);
-        ReadOnlySpan<byte> ciphertext = new(payload, nonceSize, payload.Length - nonceSize - tagSize);
-        ReadOnlySpan<byte> tag = new(payload, payload.Length - tagSize, tagSize);
-
-        byte[] plaintext = new byte[ciphertext.Length];
-
-        using var aes = new AesGcm(key, tagSize);
-        try
-        {
-            aes.Decrypt(nonce, ciphertext, tag, plaintext);
-        }
-        catch (CryptographicException ex)
-        {
-            // Tag verification failed → tampering or wrong key/nonce.
-            throw new InvalidOperationException("Decryption failed – authentication tag mismatch.", ex);
-        }
-
-        return plaintext;
-    }
-}

IdentityShroud.Core/Security/ConfigurationSecretProvider.cs

@@ -14,4 +14,9 @@ public class ConfigurationSecretProvider(IConfiguration configuration) : ISecret
     {
         return secrets.GetValue<string>(name) ?? "";
     }
+
+    public KeyEncryptionKey[] GetKeys(string name)
+    {
+        return secrets.GetSection(name).Get<KeyEncryptionKey[]>() ?? [];
+    }
 }

IdentityShroud.Core/Security/DekId.cs

@@ -0,0 +1,6 @@
+namespace IdentityShroud.Core.Security;
+
+public record struct DekId(Guid Id)
+{
+    public static DekId NewId() => new(Guid.NewGuid());
+}

IdentityShroud.Core/Security/EncryptedDek.cs

@@ -0,0 +1,6 @@
+using Microsoft.EntityFrameworkCore;
+
+namespace IdentityShroud.Core.Security;
+
+[Owned]
+public record EncryptedDek(KekId KekId, byte[] Value);

IdentityShroud.Core/Security/EncryptedValue.cs

@@ -0,0 +1,8 @@
+using Microsoft.EntityFrameworkCore;
+
+namespace IdentityShroud.Core.Security;
+
+[Owned]
+public record EncryptedValue(DekId DekId, byte[] Value);
+
+

IdentityShroud.Core/Security/Encryption.cs

@@ -0,0 +1,70 @@
+using System.Security.Cryptography;
+
+namespace IdentityShroud.Core.Security;
+
+public static class Encryption
+{
+    private record struct AlgVersion(int Version, int NonceSize, int TagSize);
+
+    private static AlgVersion[] _versions = 
+    [
+        new(0, 0, 0), // version 0 does not realy exist
+        new(1, 12, 16), // version 1
+    ];
+    
+    public static byte[] Encrypt(ReadOnlySpan<byte> plaintext, ReadOnlySpan<byte> key)
+    {
+        const int versionNumber = 1; 
+        AlgVersion versionParams = _versions[versionNumber];
+
+        int resultSize = 1 + versionParams.NonceSize + versionParams.TagSize + plaintext.Length;
+        // allocate buffer for complete response 
+        var result = new byte[resultSize];
+        
+        result[0] = (byte)versionParams.Version;
+
+        // make the spans that point to the parts of the result where their data is located
+        var nonce = result.AsSpan(1, versionParams.NonceSize); 
+        var tag = result.AsSpan(1 + versionParams.NonceSize, versionParams.TagSize);
+        var cipher = result.AsSpan(1 + versionParams.NonceSize + versionParams.TagSize);
+
+        // use the spans to place the data directly in its place
+        RandomNumberGenerator.Fill(nonce);
+        using var aes = new AesGcm(key, versionParams.TagSize);
+        aes.Encrypt(nonce, plaintext, cipher, tag);
+        return result;
+    }
+    
+    public static byte[] Decrypt(ReadOnlyMemory<byte> input, ReadOnlySpan<byte> key)
+    {
+        var payload = input.Span;
+        int versionNumber = (int)payload[0];
+        if (versionNumber != 1)
+            throw new ArgumentException("Invalid payload");
+        
+        AlgVersion versionParams = _versions[versionNumber];
+        
+        
+        if (payload.Length < 1 + versionParams.NonceSize + versionParams.TagSize)
+            throw new ArgumentException("Payload is too short to contain nonce, ciphertext, and tag.", nameof(payload));
+
+        ReadOnlySpan<byte> nonce = payload.Slice(1, versionParams.NonceSize);
+        ReadOnlySpan<byte> tag = payload.Slice(1 + versionParams.NonceSize, versionParams.TagSize);
+        ReadOnlySpan<byte> cipher = payload.Slice(1 + versionParams.NonceSize + versionParams.TagSize);
+
+        byte[] plaintext = new byte[cipher.Length];
+
+        using var aes = new AesGcm(key, versionParams.TagSize);
+        try
+        {
+            aes.Decrypt(nonce, cipher, tag, plaintext);
+        }
+        catch (CryptographicException ex)
+        {
+            // Tag verification failed → tampering or wrong key/nonce.
+            throw new InvalidOperationException("Decryption failed – authentication tag mismatch.", ex);
+        }
+
+        return plaintext;
+    }
+}

IdentityShroud.Core/Security/JsonWebAlgorithm.cs

@@ -1,5 +1,3 @@
-using System.Security.Cryptography;
-
 namespace IdentityShroud.Core.Security;
 
 public static class JsonWebAlgorithm

IdentityShroud.Core/Security/KekId.cs

@@ -0,0 +1,41 @@
+using System.ComponentModel;
+using System.Globalization;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace IdentityShroud.Core.Security;
+
+[JsonConverter(typeof(KekIdJsonConverter))]
+[TypeConverter(typeof(KekIdTypeConverter))]
+public readonly record struct KekId
+{
+    public Guid Id { get; } 
+
+    public KekId(Guid id)
+    {
+        Id = id;
+    }
+
+    public static KekId NewId()
+    {
+        return new KekId(Guid.NewGuid());
+    }
+}
+
+public class KekIdJsonConverter : JsonConverter<KekId>
+{
+    public override KekId Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+        => new KekId(reader.GetGuid());
+
+    public override void Write(Utf8JsonWriter writer, KekId value, JsonSerializerOptions options)
+        => writer.WriteStringValue(value.Id);
+}
+
+public class KekIdTypeConverter : TypeConverter
+{
+    public override bool CanConvertFrom(ITypeDescriptorContext? context, Type sourceType)
+        => sourceType == typeof(string) || base.CanConvertFrom(context, sourceType);
+
+    public override object? ConvertFrom(ITypeDescriptorContext? context, CultureInfo? culture, object value)
+        => value is string s ? new KekId(Guid.Parse(s)) : base.ConvertFrom(context, culture, value);
+}

IdentityShroud.Core/Security/KeyEncryptionKey.cs

@@ -0,0 +1,10 @@
+namespace IdentityShroud.Core.Security;
+
+/// <summary>
+/// Contains a KEK and associated relevant data. This structure
+/// </summary>
+/// <param name="Id"></param>
+/// <param name="Active"></param>
+/// <param name="Algorithm"></param>
+/// <param name="Key"></param>
+public record KeyEncryptionKey(KekId Id, bool Active, string Algorithm, byte[] Key);

IdentityShroud.Core/Security/Keys/IKeyProvider.cs

@@ -0,0 +1,19 @@
+using IdentityShroud.Core.Messages;
+
+namespace IdentityShroud.Core.Security.Keys;
+
+public abstract class KeyPolicy
+{
+    public abstract string KeyType { get; }
+}
+
+
+public interface IKeyProvider
+{
+    byte[] CreateKey(KeyPolicy policy);
+
+    void SetJwkParameters(byte[] key, JsonWebKey jwk);
+}
+
+
+

IdentityShroud.Core/Security/Keys/IKeyProviderFactory.cs

@@ -0,0 +1,7 @@
+namespace IdentityShroud.Core.Security.Keys;
+
+
+public interface IKeyProviderFactory
+{
+    public IKeyProvider CreateProvider(string keyType);
+}

IdentityShroud.Core/Security/Keys/KeyProviderFactory.cs

@@ -0,0 +1,17 @@
+using IdentityShroud.Core.Security.Keys.Rsa;
+
+namespace IdentityShroud.Core.Security.Keys;
+
+public class KeyProviderFactory : IKeyProviderFactory
+{
+    public IKeyProvider CreateProvider(string keyType)
+    {
+        switch (keyType)
+        {
+            case "RSA":
+                return new RsaProvider();
+            default:
+                throw new NotImplementedException();
+        }
+    }
+}

IdentityShroud.Core/Security/Keys/Rsa/RsaProvider.cs

@@ -0,0 +1,35 @@
+using System.Buffers.Text;
+using System.Security.Cryptography;
+using IdentityShroud.Core.Messages;
+
+namespace IdentityShroud.Core.Security.Keys.Rsa;
+
+public class RsaKeyPolicy : KeyPolicy
+{
+    public override string KeyType => "RSA";
+    public int KeySize { get; } = 2048;
+}
+
+public class RsaProvider : IKeyProvider
+{
+    public byte[] CreateKey(KeyPolicy policy)
+    {
+        if (policy is RsaKeyPolicy p)
+        {
+            using var rsa = RSA.Create(p.KeySize);
+            return rsa.ExportPkcs8PrivateKey();
+        }
+
+        throw new ArgumentException("Incorrect policy type", nameof(policy));
+    }
+
+    public void SetJwkParameters(byte[] key, JsonWebKey jwk)
+    {
+        using var rsa = RSA.Create();
+        rsa.ImportPkcs8PrivateKey(key, out _);
+        var parameters = rsa.ExportParameters(includePrivateParameters: false);
+
+        jwk.Exponent = Base64Url.EncodeToString(parameters.Exponent);
+        jwk.Modulus = Base64Url.EncodeToString(parameters.Modulus);
+    }
+}

IdentityShroud.Core/Security/RsaHelper.cs

@@ -1,16 +0,0 @@
-using System.Security.Cryptography;
-
-namespace IdentityShroud.Core.Security;
-
-public static class RsaHelper
-{
-    /// <summary>
-    /// Load RSA private key from PKCS#8 format
-    /// </summary>
-    public static RSA LoadFromPkcs8(byte[] pkcs8Key)
-    {
-        var rsa = RSA.Create();
-        rsa.ImportPkcs8PrivateKey(pkcs8Key, out _);
-        return rsa;
-    }
-}

IdentityShroud.Core/Services/ClientService.cs

@@ -0,0 +1,65 @@
+using System.Security.Cryptography;
+using IdentityShroud.Core.Contracts;
+using IdentityShroud.Core.Model;
+using Microsoft.EntityFrameworkCore;
+
+namespace IdentityShroud.Core.Services;
+
+public class ClientService(
+    Db db,
+    IDataEncryptionService cryptor,
+    IClock clock) : IClientService
+{
+    public async Task<Result<Client>> Create(Guid realmId, ClientCreateRequest request, CancellationToken ct = default)
+    {
+        Client client = new()
+        {
+            RealmId = realmId,
+            ClientId = request.ClientId,
+            Name = request.Name,
+            Description = request.Description,
+            SignatureAlgorithm = request.SignatureAlgorithm,
+            AllowClientCredentialsFlow = request.AllowClientCredentialsFlow ?? false,
+            CreatedAt = clock.UtcNow(),
+        };
+        
+        if (client.AllowClientCredentialsFlow)
+        {
+            client.Secrets.Add(CreateSecret());
+        }
+
+        await db.AddAsync(client, ct);
+        await db.SaveChangesAsync(ct);
+
+        return client;
+    }
+
+    public async Task<Client?> GetByClientId(
+        Guid realmId,
+        string clientId, 
+        CancellationToken ct = default)
+    {
+        return await db.Clients.FirstOrDefaultAsync(c => c.ClientId == clientId && c.RealmId == realmId, ct);
+    }
+
+    public async Task<Client?> FindById(
+        Guid realmId,
+        int id, 
+        CancellationToken ct = default)
+    {
+        return await db.Clients.FirstOrDefaultAsync(c => c.Id == id && c.RealmId == realmId, ct);
+    }
+
+    private ClientSecret CreateSecret()
+    {
+        Span<byte> secret = stackalloc byte[24];
+        RandomNumberGenerator.Fill(secret);
+
+        return new ClientSecret()
+        {
+            CreatedAt = clock.UtcNow(),
+            Secret = cryptor.Encrypt(secret.ToArray()),
+        };
+
+    }
+}

IdentityShroud.Core/Services/ClockService.cs

@@ -0,0 +1,11 @@
+using IdentityShroud.Core.Contracts;
+
+namespace IdentityShroud.Core.Services;
+
+public class ClockService : IClock
+{
+    public DateTime UtcNow()
+    {
+        return DateTime.UtcNow;
+    }
+}

IdentityShroud.Core/Services/DataEncryptionService.cs

@@ -0,0 +1,41 @@
+using IdentityShroud.Core.Contracts;
+using IdentityShroud.Core.Model;
+using IdentityShroud.Core.Security;
+
+namespace IdentityShroud.Core.Services;
+
+public class DataEncryptionService(
+    IRealmContext realmContext,
+    IDekEncryptionService dekCryptor) : IDataEncryptionService
+{
+    
+    // Note this array is expected to have one item in it most of the during key rotation it will have two
+    // until it is ensured the old key can safely be removed. More then two will work but is not really expected.
+    private IList<RealmDek>? _deks = null;
+
+    private IList<RealmDek> GetDeks()
+    {
+        if (_deks is null)
+            _deks = realmContext.GetDeks().Result;
+
+        return _deks;
+    }
+
+    private RealmDek GetActiveDek() => GetDeks().Single(d => d.Active);
+    private RealmDek GetKey(DekId id) => GetDeks().Single(d => d.Id == id);
+    
+    public byte[] Decrypt(EncryptedValue input)
+    {
+        var dek = GetKey(input.DekId);
+        var key = dekCryptor.Decrypt(dek.KeyData);
+        return Encryption.Decrypt(input.Value, key);
+    }
+
+    public EncryptedValue Encrypt(ReadOnlySpan<byte> plain)
+    {
+        var dek = GetActiveDek();
+        var key = dekCryptor.Decrypt(dek.KeyData);
+        byte[] cipher = Encryption.Encrypt(plain, key);
+        return new (dek.Id, cipher);
+    }
+}

IdentityShroud.Core/Services/DekEncryptionService.cs

@@ -0,0 +1,38 @@
+using IdentityShroud.Core.Contracts;
+using IdentityShroud.Core.Security;
+
+namespace IdentityShroud.Core.Services;
+
+/// <summary>
+/// 
+/// </summary>
+public class DekEncryptionService : IDekEncryptionService
+{
+    // Note this array is expected to have one item in it most of the during key rotation it will have two
+    // until it is ensured the old key can safely be removed. More then two will work but is not really expected.
+    private readonly KeyEncryptionKey[] _encryptionKeys;
+
+    private KeyEncryptionKey ActiveKey => _encryptionKeys.Single(k => k.Active);
+    private KeyEncryptionKey GetKey(KekId keyId) => _encryptionKeys.Single(k => k.Id == keyId);
+
+    public DekEncryptionService(ISecretProvider secretProvider)
+    {
+        _encryptionKeys = secretProvider.GetKeys("master");
+        // if (_encryptionKey.Length != 32) // 256‑bit key
+        //     throw new Exception("Key must be 256 bits (32 bytes) for AES‑256‑GCM.");
+    }
+
+    public EncryptedDek Encrypt(ReadOnlySpan<byte> plaintext)
+    {
+        var encryptionKey = ActiveKey;
+        byte[] cipher = Encryption.Encrypt(plaintext, encryptionKey.Key);
+        return new (encryptionKey.Id, cipher);
+    }
+
+    public byte[] Decrypt(EncryptedDek input)
+    {
+        var encryptionKey = GetKey(input.KekId);
+
+        return Encryption.Decrypt(input.Value, encryptionKey.Key);
+    }
+}

IdentityShroud.Core/Services/EncryptionService.cs

@@ -1,27 +0,0 @@
-using IdentityShroud.Core.Contracts;
-using IdentityShroud.Core.Security;
-
-namespace IdentityShroud.Core.Services;
-
-/// <summary>
-/// 
-/// </summary>
-public class EncryptionService : IEncryptionService
-{
-    private readonly byte[] encryptionKey;
-
-    public EncryptionService(ISecretProvider secretProvider)
-    {
-        encryptionKey = Convert.FromBase64String(secretProvider.GetSecret("Master"));
-    }
-
-    public byte[] Encrypt(byte[] plain)
-    {
-        return AesGcmHelper.EncryptAesGcm(plain, encryptionKey);
-    }
-
-    public byte[] Decrypt(byte[] cipher)
-    {
-        return AesGcmHelper.DecryptAesGcm(cipher, encryptionKey);
-    }
-}

IdentityShroud.Core/Services/KeyService.cs

@@ -0,0 +1,46 @@
+using IdentityShroud.Core.Contracts;
+using IdentityShroud.Core.Messages;
+using IdentityShroud.Core.Model;
+using IdentityShroud.Core.Security.Keys;
+
+namespace IdentityShroud.Core.Services;
+
+public class KeyService(
+    IDekEncryptionService cryptor,
+    IKeyProviderFactory keyProviderFactory,
+    IClock clock) : IKeyService
+{
+    public RealmKey CreateKey(KeyPolicy policy)
+    {
+        IKeyProvider provider = keyProviderFactory.CreateProvider(policy.KeyType);
+        var plainKey = provider.CreateKey(policy);
+
+        return CreateKey(policy.KeyType, plainKey);
+    }
+
+    public JsonWebKey? CreateJsonWebKey(RealmKey realmKey)
+    {
+        JsonWebKey jwk = new()
+        {
+            KeyId = realmKey.Id.ToString(),
+            KeyType = realmKey.KeyType,
+            Use = "sig",
+        };
+        
+        IKeyProvider provider = keyProviderFactory.CreateProvider(realmKey.KeyType);
+        provider.SetJwkParameters(
+            cryptor.Decrypt(realmKey.Key),
+            jwk);
+
+        return jwk;
+    }
+
+    private RealmKey CreateKey(string keyType, byte[] plainKey) =>
+        new RealmKey()
+            {
+                Id = Guid.NewGuid(),
+                KeyType = keyType,
+                Key = cryptor.Encrypt(plainKey),
+                CreatedAt = clock.UtcNow(),
+            };
+}

IdentityShroud.Core/Services/RealmContext.cs

@@ -0,0 +1,26 @@
+using IdentityShroud.Core.Contracts;
+using IdentityShroud.Core.Model;
+using Microsoft.AspNetCore.Http;
+
+namespace IdentityShroud.Core.Services;
+
+public class RealmContext(
+    IHttpContextAccessor accessor,
+    IRealmService realmService) : IRealmContext
+{
+    public Realm GetRealm()
+    {
+        return (Realm)accessor.HttpContext.Items["RealmEntity"];
+    }
+
+    public async Task<IList<RealmDek>> GetDeks(CancellationToken ct = default)
+    {
+        Realm realm = GetRealm();
+        if (realm.Deks.Count == 0)
+        {
+            await realmService.LoadDeks(realm);
+        }
+
+        return realm.Deks;
+    }
+}

IdentityShroud.Core/Services/RealmService.cs

@@ -1,8 +1,9 @@
-using System.Security.Cryptography;
 using IdentityShroud.Core.Contracts;
 using IdentityShroud.Core.Helpers;
 using IdentityShroud.Core.Messages.Realm;
 using IdentityShroud.Core.Model;
+using IdentityShroud.Core.Security.Keys;
+using IdentityShroud.Core.Security.Keys.Rsa;
 using Microsoft.EntityFrameworkCore;
 
 namespace IdentityShroud.Core.Services;
@@ -11,8 +12,14 @@ public record RealmCreateResponse(Guid Id, string Slug, string Name);
 
 public class RealmService(
     Db db,
-    IEncryptionService encryptionService) : IRealmService
+    IKeyService keyService) : IRealmService
 {
+    public async Task<Realm?> FindById(Guid id, CancellationToken ct = default)
+    {
+        return await db.Realms
+            .SingleOrDefaultAsync(r => r.Id == id, ct);
+    }
+
     public async Task<Realm?> FindBySlug(string slug, CancellationToken ct = default)
     {
         return await db.Realms
@@ -26,9 +33,10 @@ public class RealmService(
             Id = request.Id ?? Guid.CreateVersion7(),
             Slug = request.Slug ?? SlugHelper.GenerateSlug(request.Name),
             Name = request.Name,
-            Keys = [ CreateKey() ],
         };
         
+        realm.Keys.Add(keyService.CreateKey(GetKeyPolicy(realm)));
+
         db.Add(realm);
         await db.SaveChangesAsync(ct);
         
@@ -36,25 +44,26 @@ public class RealmService(
             realm.Id, realm.Slug, realm.Name);
     }
 
+    /// <summary>
+    /// Place holder for getting policies from the realm and falling back to sane defaults when no policies have been set.
+    /// </summary>
+    /// <param name="_"></param>
+    /// <returns></returns>
+    private KeyPolicy GetKeyPolicy(Realm _) => new RsaKeyPolicy();
+    
+
     public async Task LoadActiveKeys(Realm realm)
     {
         await db.Entry(realm).Collection(r => r.Keys)
             .Query()
-            .Where(k => k.DeactivatedAt == null)
+            .Where(k => k.RevokedAt == null)
             .LoadAsync();
-        
     }
 
-    private Key CreateKey()
+    public async Task LoadDeks(Realm realm)
     {
-        using RSA rsa = RSA.Create(2048);
+        await db.Entry(realm).Collection(r => r.Deks)
-
+            .Query()
-        Key key = new()
+            .LoadAsync();
-        {
-            Priority = 10,
-        };
-        key.SetPrivateKey(encryptionService, rsa.ExportPkcs8PrivateKey());
-
-        return key;
     }
 }

IdentityShroud.TestUtils/Asserts/JsonObjectAssert.cs

@@ -1,6 +1,5 @@
 using System.Text.Json.Nodes;
 using System.Text.RegularExpressions;
-using Xunit;
 
 namespace IdentityShroud.TestUtils.Asserts;
 

IdentityShroud.TestUtils/Asserts/ResultAssert.cs

@@ -1,5 +1,4 @@
 using FluentResults;
-using Xunit;
 
 namespace IdentityShroud.Core.Tests;
 

IdentityShroud.TestUtils/IdentityShroud.TestUtils.csproj

@@ -10,6 +10,7 @@
     <ItemGroup>
       <PackageReference Include="FluentResults" Version="4.0.0" />
       <PackageReference Include="xunit.v3.assert" Version="3.2.2" />
+      <PackageReference Include="NSubstitute" Version="5.3.0" />
     </ItemGroup>
 
     <ItemGroup>
@@ -21,10 +22,4 @@
         <Using Include="NSubstitute"/>
     </ItemGroup>
 
-    <ItemGroup>
-      <Reference Include="NSubstitute">
-        <HintPath>..\..\..\.nuget\packages\nsubstitute\5.3.0\lib\net6.0\NSubstitute.dll</HintPath>
-      </Reference>
-    </ItemGroup>
-
 </Project>

IdentityShroud.TestUtils/Substitutes/EncryptionServiceSubstitute.cs

@@ -1,18 +0,0 @@
-using IdentityShroud.Core.Contracts;
-
-namespace IdentityShroud.TestUtils.Substitutes;
-
-public static class EncryptionServiceSubstitute
-{
-    public static IEncryptionService CreatePassthrough()
-    {
-        var encryptionService = Substitute.For<IEncryptionService>();
-        encryptionService
-            .Encrypt(Arg.Any<byte[]>())
-            .Returns(x => x.ArgAt<byte[]>(0));
-        encryptionService
-            .Decrypt(Arg.Any<byte[]>())
-            .Returns(x => x.ArgAt<byte[]>(0));
-        return encryptionService;
-    }
-}

IdentityShroud.TestUtils/Substitutes/NullDataEncryptionService.cs

@@ -0,0 +1,18 @@
+using IdentityShroud.Core.Contracts;
+using IdentityShroud.Core.Security;
+
+namespace IdentityShroud.TestUtils.Substitutes;
+
+public class NullDataEncryptionService : IDataEncryptionService
+{
+    public DekId KeyId { get; } = DekId.NewId(); 
+    public EncryptedValue Encrypt(ReadOnlySpan<byte> plain)
+    {
+        return new(KeyId, plain.ToArray());
+    }
+
+    public byte[] Decrypt(EncryptedValue input)
+    {
+        return input.Value;
+    }
+}

IdentityShroud.TestUtils/Substitutes/NullDekEncryptionService.cs

@@ -0,0 +1,18 @@
+using IdentityShroud.Core.Contracts;
+using IdentityShroud.Core.Security;
+
+namespace IdentityShroud.TestUtils.Substitutes;
+
+public class NullDekEncryptionService : IDekEncryptionService
+{
+    public KekId KeyId { get; } = KekId.NewId(); 
+    public EncryptedDek Encrypt(ReadOnlySpan<byte> plain)
+    {
+        return new(KeyId, plain.ToArray());
+    }
+
+    public byte[] Decrypt(EncryptedDek input)
+    {
+        return input.Value;
+    }
+}

IdentityShroud.sln.DotSettings.user

@@ -2,32 +2,47 @@
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README.md

@@ -0,0 +1,4 @@
+# IdentityShroud
+
+IdentityShroud is a .NET project for identity management and protection.
+