feat: http provider signing key addition (#10641)

# Which Problems Are Solved

HTTP Request to HTTP providers for Email or SMS are not signed.

# How the Problems Are Solved

Add a Signing Key to the HTTP Provider resources, which is then used to
generate a header to sign the payload.

# Additional Changes

Additional tests for query side of the SMTP provider.

# Additional Context

Closes #10067

---------

Co-authored-by: Marco A. <marco@zitadel.com>
(cherry picked from commit 8909b9a2a6)

cmd/mirror/projections.go

@@ -149,6 +149,8 @@ func projections(
 		keys.OIDC,
 		keys.SAML,
 		keys.Target,
+		keys.SMS,
+		keys.SMTP,
 		config.InternalAuthZ.RolePermissionMappings,
 		sessionTokenVerifier,
 		func(q *query.Queries) domain.PermissionCheck {

cmd/setup/62.go

@@ -0,0 +1,27 @@
+package setup
+
+import (
+	"context"
+	_ "embed"
+
+	"github.com/zitadel/zitadel/internal/database"
+	"github.com/zitadel/zitadel/internal/eventstore"
+)
+
+var (
+	//go:embed 62.sql
+	addHTTPProviderSigningKey string
+)
+
+type HTTPProviderAddSigningKey struct {
+	dbClient *database.DB
+}
+
+func (mig *HTTPProviderAddSigningKey) Execute(ctx context.Context, _ eventstore.Event) error {
+	_, err := mig.dbClient.ExecContext(ctx, addHTTPProviderSigningKey)
+	return err
+}
+
+func (mig *HTTPProviderAddSigningKey) String() string {
+	return "62_http_provider_add_signing_key"
+}

cmd/setup/62.sql

@@ -0,0 +1,2 @@
+ALTER TABLE IF EXISTS projections.sms_configs3_http ADD COLUMN IF NOT EXISTS signing_key TEXT NULL;
+ALTER TABLE IF EXISTS projections.smtp_configs5_http ADD COLUMN IF NOT EXISTS signing_key TEXT NULL;

cmd/setup/config.go

@@ -158,6 +158,7 @@ type Steps struct {
 	s59SetupWebkeys                         *SetupWebkeys
 	s60GenerateSystemID                     *GenerateSystemID
 	s61IDPTemplate6SAMLSignatureAlgorithm   *IDPTemplate6SAMLSignatureAlgorithm
+	s62HTTPProviderAddSigningKey            *HTTPProviderAddSigningKey
 }
 
 func MustNewSteps(v *viper.Viper) *Steps {

cmd/setup/setup.go

@@ -219,6 +219,7 @@ func Setup(ctx context.Context, config *Config, steps *Steps, masterKey string)
 	steps.s58ReplaceLoginNames3View = &ReplaceLoginNames3View{dbClient: dbClient}
 	steps.s60GenerateSystemID = &GenerateSystemID{eventstore: eventstoreClient}
 	steps.s61IDPTemplate6SAMLSignatureAlgorithm = &IDPTemplate6SAMLSignatureAlgorithm{dbClient: dbClient}
+	steps.s62HTTPProviderAddSigningKey = &HTTPProviderAddSigningKey{dbClient: dbClient}
 
 	err = projection.Create(ctx, dbClient, eventstoreClient, config.Projections, nil, nil, nil)
 	logging.OnError(err).Fatal("unable to start projections")
@@ -268,6 +269,7 @@ func Setup(ctx context.Context, config *Config, steps *Steps, masterKey string)
 		steps.s58ReplaceLoginNames3View,
 		steps.s60GenerateSystemID,
 		steps.s61IDPTemplate6SAMLSignatureAlgorithm,
+		steps.s62HTTPProviderAddSigningKey,
 	} {
 		setupErr = executeMigration(ctx, eventstoreClient, step, "migration failed")
 		if setupErr != nil {
@@ -468,6 +470,8 @@ func startCommandsQueries(
 		keys.OIDC,
 		keys.SAML,
 		keys.Target,
+		keys.SMS,
+		keys.SMTP,
 		config.InternalAuthZ.RolePermissionMappings,
 		sessionTokenVerifier,
 		func(q *query.Queries) domain.PermissionCheck {

cmd/start/start.go

@@ -205,6 +205,8 @@ func startZitadel(ctx context.Context, config *Config, masterKey string, server
 		keys.OIDC,
 		keys.SAML,
 		keys.Target,
+		keys.SMS,
+		keys.SMTP,
 		config.InternalAuthZ.RolePermissionMappings,
 		sessionTokenVerifier,
 		func(q *query.Queries) domain.PermissionCheck {

internal/api/grpc/admin/email.go

@@ -55,8 +55,9 @@ func (s *Server) AddEmailProviderHTTP(ctx context.Context, req *admin_pb.AddEmai
 		return nil, err
 	}
 	return &admin_pb.AddEmailProviderHTTPResponse{
-		Details: object.DomainToChangeDetailsPb(config.Details),
-		Id:      config.ID,
+		Details:    object.DomainToChangeDetailsPb(config.Details),
+		Id:         config.ID,
+		SigningKey: config.SigningKey,
 	}, nil
 }
 
@@ -66,7 +67,8 @@ func (s *Server) UpdateEmailProviderHTTP(ctx context.Context, req *admin_pb.Upda
 		return nil, err
 	}
 	return &admin_pb.UpdateEmailProviderHTTPResponse{
-		Details: object.DomainToChangeDetailsPb(config.Details),
+		Details:    object.DomainToChangeDetailsPb(config.Details),
+		SigningKey: config.SigningKey,
 	}, nil
 }
 

internal/api/grpc/admin/email_converters.go

@@ -68,7 +68,8 @@ func emailProviderToPb(config *query.SMTPConfig) settings_pb.EmailConfig {
 func httpToPb(http *query.HTTP) *settings_pb.EmailProvider_Http {
 	return &settings_pb.EmailProvider_Http{
 		Http: &settings_pb.EmailProviderHTTP{
-			Endpoint: http.Endpoint,
+			Endpoint:   http.Endpoint,
+			SigningKey: http.SigningKey,
 		},
 	}
 }
@@ -76,11 +77,12 @@ func httpToPb(http *query.HTTP) *settings_pb.EmailProvider_Http {
 func smtpToPb(config *query.SMTP) *settings_pb.EmailProvider_Smtp {
 	return &settings_pb.EmailProvider_Smtp{
 		Smtp: &settings_pb.EmailProviderSMTP{
-			Tls:           config.TLS,
-			Host:          config.Host,
-			User:          config.User,
-			SenderAddress: config.SenderAddress,
-			SenderName:    config.SenderName,
+			Tls:            config.TLS,
+			Host:           config.Host,
+			User:           config.User,
+			SenderAddress:  config.SenderAddress,
+			SenderName:     config.SenderName,
+			ReplyToAddress: config.ReplyToAddress,
 		},
 	}
 }
@@ -123,11 +125,14 @@ func addEmailProviderHTTPToConfig(ctx context.Context, req *admin_pb.AddEmailPro
 }
 
 func updateEmailProviderHTTPToConfig(ctx context.Context, req *admin_pb.UpdateEmailProviderHTTPRequest) *command.ChangeSMTPConfigHTTP {
+	// TODO handle expiration, currently only immediate expiration is supported
+	expirationSigningKey := req.GetExpirationSigningKey() != nil
 	return &command.ChangeSMTPConfigHTTP{
-		ResourceOwner: authz.GetInstance(ctx).InstanceID(),
-		ID:            req.Id,
-		Description:   req.Description,
-		Endpoint:      req.Endpoint,
+		ResourceOwner:        authz.GetInstance(ctx).InstanceID(),
+		ID:                   req.Id,
+		Description:          req.Description,
+		Endpoint:             req.Endpoint,
+		ExpirationSigningKey: expirationSigningKey,
 	}
 }
 

internal/api/grpc/admin/email_converters_test.go

@@ -0,0 +1,554 @@
+package admin
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"google.golang.org/protobuf/types/known/durationpb"
+	"google.golang.org/protobuf/types/known/timestamppb"
+
+	"github.com/zitadel/zitadel/internal/api/authz"
+	"github.com/zitadel/zitadel/internal/command"
+	"github.com/zitadel/zitadel/internal/domain"
+	"github.com/zitadel/zitadel/internal/query"
+	admin_pb "github.com/zitadel/zitadel/pkg/grpc/admin"
+	object_pb "github.com/zitadel/zitadel/pkg/grpc/object"
+	settings_pb "github.com/zitadel/zitadel/pkg/grpc/settings"
+)
+
+func Test_listEmailProvidersToModel(t *testing.T) {
+	type args struct {
+		req *admin_pb.ListEmailProvidersRequest
+	}
+	tests := []struct {
+		name string
+		args args
+		res  *query.SMTPConfigsSearchQueries
+	}{
+		{
+			name: "all fields filled",
+			args: args{
+				req: &admin_pb.ListEmailProvidersRequest{
+					Query: &object_pb.ListQuery{
+						Offset: 100,
+						Limit:  100,
+						Asc:    true,
+					},
+				},
+			},
+			res: &query.SMTPConfigsSearchQueries{
+				SearchRequest: query.SearchRequest{
+					Offset: 100,
+					Limit:  100,
+					Asc:    true,
+				},
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := listEmailProvidersToModel(tt.args.req)
+			require.NoError(t, err)
+			assert.Equal(t, tt.res, got)
+		})
+	}
+}
+
+func Test_emailProvidersToPb(t *testing.T) {
+	type args struct {
+		req []*query.SMTPConfig
+	}
+	tests := []struct {
+		name string
+		args args
+		res  []*settings_pb.EmailProvider
+	}{
+		{
+			name: "all fields filled",
+			args: args{
+				req: []*query.SMTPConfig{
+					{
+						CreationDate:  time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC),
+						ChangeDate:    time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC),
+						ResourceOwner: "resourceowner",
+						AggregateID:   "agg",
+						ID:            "id",
+						Sequence:      1,
+						Description:   "description",
+						SMTPConfig: &query.SMTP{
+							TLS:            true,
+							SenderAddress:  "sender",
+							SenderName:     "sendername",
+							ReplyToAddress: "address",
+							Host:           "host",
+							User:           "user",
+						},
+						HTTPConfig: nil,
+						State:      1,
+					},
+					{
+						CreationDate:  time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC),
+						ChangeDate:    time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC),
+						ResourceOwner: "resourceowner",
+						AggregateID:   "agg",
+						ID:            "id",
+						Sequence:      1,
+						Description:   "description",
+						SMTPConfig:    nil,
+						HTTPConfig: &query.HTTP{
+							Endpoint:   "endpoint",
+							SigningKey: "key",
+						},
+						State: 1,
+					},
+				},
+			},
+			res: []*settings_pb.EmailProvider{
+				{
+					Details: &object_pb.ObjectDetails{
+						Sequence:      1,
+						CreationDate:  timestamppb.New(time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC)),
+						ChangeDate:    timestamppb.New(time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC)),
+						ResourceOwner: "resourceowner",
+					},
+					Id:          "id",
+					State:       1,
+					Description: "description",
+					Config: &settings_pb.EmailProvider_Smtp{
+						Smtp: &settings_pb.EmailProviderSMTP{
+							SenderAddress:  "sender",
+							SenderName:     "sendername",
+							Tls:            true,
+							Host:           "host",
+							User:           "user",
+							ReplyToAddress: "address",
+						},
+					},
+				},
+				{
+					Details: &object_pb.ObjectDetails{
+						Sequence:      1,
+						CreationDate:  timestamppb.New(time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC)),
+						ChangeDate:    timestamppb.New(time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC)),
+						ResourceOwner: "resourceowner",
+					},
+					Id:          "id",
+					State:       1,
+					Description: "description",
+					Config: &settings_pb.EmailProvider_Http{
+						Http: &settings_pb.EmailProviderHTTP{
+							Endpoint:   "endpoint",
+							SigningKey: "key",
+						},
+					},
+				},
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := emailProvidersToPb(tt.args.req)
+			assert.Equal(t, tt.res, got)
+		})
+	}
+}
+
+func Test_emailProviderToProviderPb(t *testing.T) {
+	type args struct {
+		req *query.SMTPConfig
+	}
+	tests := []struct {
+		name string
+		args args
+		res  *settings_pb.EmailProvider
+	}{
+		{
+			name: "all fields filled, smtp",
+			args: args{
+				req: &query.SMTPConfig{
+
+					CreationDate:  time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC),
+					ChangeDate:    time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC),
+					ResourceOwner: "resourceowner",
+					AggregateID:   "agg",
+					ID:            "id",
+					Sequence:      1,
+					Description:   "description",
+					SMTPConfig: &query.SMTP{
+						TLS:            true,
+						SenderAddress:  "sender",
+						SenderName:     "sendername",
+						ReplyToAddress: "address",
+						Host:           "host",
+						User:           "user",
+					},
+					HTTPConfig: &query.HTTP{
+						Endpoint:   "endpoint",
+						SigningKey: "key",
+					},
+					State: 1,
+				},
+			},
+			res: &settings_pb.EmailProvider{
+				Details: &object_pb.ObjectDetails{
+					Sequence:      1,
+					CreationDate:  timestamppb.New(time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC)),
+					ChangeDate:    timestamppb.New(time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC)),
+					ResourceOwner: "resourceowner",
+				},
+				Id:          "id",
+				State:       1,
+				Description: "description",
+				Config: &settings_pb.EmailProvider_Smtp{
+					Smtp: &settings_pb.EmailProviderSMTP{
+						SenderAddress:  "sender",
+						SenderName:     "sendername",
+						Tls:            true,
+						Host:           "host",
+						User:           "user",
+						ReplyToAddress: "address",
+					},
+				},
+			},
+		},
+		{
+			name: "all fields filled, http",
+			args: args{
+				req: &query.SMTPConfig{
+					CreationDate:  time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC),
+					ChangeDate:    time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC),
+					ResourceOwner: "resourceowner",
+					AggregateID:   "agg",
+					ID:            "id",
+					Sequence:      1,
+					Description:   "description",
+					HTTPConfig: &query.HTTP{
+						Endpoint:   "endpoint",
+						SigningKey: "key",
+					},
+					State: 1,
+				},
+			},
+			res: &settings_pb.EmailProvider{
+				Details: &object_pb.ObjectDetails{
+					Sequence:      1,
+					CreationDate:  timestamppb.New(time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC)),
+					ChangeDate:    timestamppb.New(time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC)),
+					ResourceOwner: "resourceowner",
+				},
+				Id:          "id",
+				State:       1,
+				Description: "description",
+				Config: &settings_pb.EmailProvider_Http{
+					Http: &settings_pb.EmailProviderHTTP{
+						Endpoint:   "endpoint",
+						SigningKey: "key",
+					},
+				},
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := emailProviderToProviderPb(tt.args.req)
+			assert.Equal(t, tt.res, got)
+		})
+	}
+}
+
+func Test_emailProviderStateToPb(t *testing.T) {
+	type args struct {
+		req domain.SMTPConfigState
+	}
+	tests := []struct {
+		name string
+		args args
+		res  settings_pb.EmailProviderState
+	}{
+		{
+			name: "unspecified",
+			args: args{
+				req: domain.SMTPConfigStateUnspecified,
+			},
+			res: settings_pb.EmailProviderState_EMAIL_PROVIDER_STATE_UNSPECIFIED,
+		},
+		{
+			name: "removed",
+			args: args{
+				req: domain.SMTPConfigStateRemoved,
+			},
+			res: settings_pb.EmailProviderState_EMAIL_PROVIDER_STATE_UNSPECIFIED,
+		},
+		{
+			name: "active",
+			args: args{
+				req: domain.SMTPConfigStateActive,
+			},
+			res: settings_pb.EmailProviderState_EMAIL_PROVIDER_ACTIVE,
+		},
+		{
+			name: "inactive",
+			args: args{
+				req: domain.SMTPConfigStateInactive,
+			},
+			res: settings_pb.EmailProviderState_EMAIL_PROVIDER_INACTIVE,
+		},
+		{
+			name: "default",
+			args: args{
+				req: 100,
+			},
+			res: settings_pb.EmailProviderState_EMAIL_PROVIDER_STATE_UNSPECIFIED,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := emailProviderStateToPb(tt.args.req)
+			assert.Equal(t, tt.res, got)
+		})
+	}
+}
+
+func Test_httpToPb(t *testing.T) {
+	type args struct {
+		req *query.HTTP
+	}
+	tests := []struct {
+		name string
+		args args
+		res  *settings_pb.EmailProvider_Http
+	}{
+		{
+			name: "all fields filled",
+			args: args{
+				req: &query.HTTP{
+					Endpoint:   "endpoint",
+					SigningKey: "key",
+				},
+			},
+			res: &settings_pb.EmailProvider_Http{
+				Http: &settings_pb.EmailProviderHTTP{
+					Endpoint:   "endpoint",
+					SigningKey: "key",
+				},
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := httpToPb(tt.args.req)
+			assert.Equal(t, tt.res, got)
+		})
+	}
+}
+
+func Test_smtpToPb(t *testing.T) {
+	type args struct {
+		req *query.SMTP
+	}
+	tests := []struct {
+		name string
+		args args
+		res  *settings_pb.EmailProvider_Smtp
+	}{
+		{
+			name: "all fields filled",
+			args: args{
+				req: &query.SMTP{
+					SenderAddress:  "sender",
+					SenderName:     "sendername",
+					TLS:            true,
+					Host:           "host",
+					User:           "user",
+					ReplyToAddress: "address",
+				},
+			},
+			res: &settings_pb.EmailProvider_Smtp{
+				Smtp: &settings_pb.EmailProviderSMTP{
+					SenderAddress:  "sender",
+					SenderName:     "sendername",
+					Tls:            true,
+					Host:           "host",
+					User:           "user",
+					ReplyToAddress: "address",
+				},
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := smtpToPb(tt.args.req)
+			assert.Equal(t, tt.res, got)
+		})
+	}
+}
+
+func Test_addEmailProviderSMTPToConfig(t *testing.T) {
+	type args struct {
+		ctx context.Context
+		req *admin_pb.AddEmailProviderSMTPRequest
+	}
+	tests := []struct {
+		name string
+		args args
+		res  *command.AddSMTPConfig
+	}{
+		{
+			name: "all fields filled",
+			args: args{
+				ctx: authz.WithInstanceID(context.Background(), "instance"),
+				req: &admin_pb.AddEmailProviderSMTPRequest{
+					SenderAddress:  "sender",
+					SenderName:     "sendername",
+					Tls:            true,
+					Host:           "host",
+					User:           "user",
+					Password:       "password",
+					ReplyToAddress: "address",
+					Description:    "description",
+				},
+			},
+			res: &command.AddSMTPConfig{
+				ResourceOwner:  "instance",
+				Description:    "description",
+				Host:           "host",
+				User:           "user",
+				Password:       "password",
+				Tls:            true,
+				From:           "sender",
+				FromName:       "sendername",
+				ReplyToAddress: "address",
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := addEmailProviderSMTPToConfig(tt.args.ctx, tt.args.req)
+			assert.Equal(t, tt.res, got)
+		})
+	}
+}
+
+func Test_updateEmailProviderSMTPToConfig(t *testing.T) {
+	type args struct {
+		ctx context.Context
+		req *admin_pb.UpdateEmailProviderSMTPRequest
+	}
+	tests := []struct {
+		name string
+		args args
+		res  *command.ChangeSMTPConfig
+	}{
+		{
+			name: "all fields filled",
+			args: args{
+				ctx: authz.WithInstanceID(context.Background(), "instance"),
+				req: &admin_pb.UpdateEmailProviderSMTPRequest{
+					SenderAddress:  "sender",
+					SenderName:     "sendername",
+					Tls:            true,
+					Host:           "host",
+					User:           "user",
+					ReplyToAddress: "address",
+					Password:       "password",
+					Description:    "description",
+					Id:             "id",
+				},
+			},
+			res: &command.ChangeSMTPConfig{
+				ResourceOwner:  "instance",
+				ID:             "id",
+				Description:    "description",
+				Host:           "host",
+				User:           "user",
+				Password:       "password",
+				Tls:            true,
+				From:           "sender",
+				FromName:       "sendername",
+				ReplyToAddress: "address",
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := updateEmailProviderSMTPToConfig(tt.args.ctx, tt.args.req)
+			assert.Equal(t, tt.res, got)
+		})
+	}
+}
+
+func Test_addEmailProviderHTTPToConfig(t *testing.T) {
+	type args struct {
+		ctx context.Context
+		req *admin_pb.AddEmailProviderHTTPRequest
+	}
+	tests := []struct {
+		name string
+		args args
+		res  *command.AddSMTPConfigHTTP
+	}{
+		{
+			name: "all fields filled",
+			args: args{
+				ctx: authz.WithInstanceID(context.Background(), "instance"),
+				req: &admin_pb.AddEmailProviderHTTPRequest{
+					Endpoint:    "endpoint",
+					Description: "description",
+				},
+			},
+			res: &command.AddSMTPConfigHTTP{
+				ResourceOwner: "instance",
+				ID:            "",
+				Description:   "description",
+				Endpoint:      "endpoint",
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := addEmailProviderHTTPToConfig(tt.args.ctx, tt.args.req)
+			assert.Equal(t, tt.res, got)
+		})
+	}
+}
+
+func Test_updateEmailProviderHTTPToConfig(t *testing.T) {
+	type args struct {
+		ctx context.Context
+		req *admin_pb.UpdateEmailProviderHTTPRequest
+	}
+	tests := []struct {
+		name string
+		args args
+		res  *command.ChangeSMTPConfigHTTP
+	}{
+		{
+			name: "all fields filled",
+			args: args{
+				ctx: authz.WithInstanceID(context.Background(), "instance"),
+				req: &admin_pb.UpdateEmailProviderHTTPRequest{
+					Id:                   "id",
+					Endpoint:             "endpoint",
+					Description:          "description",
+					ExpirationSigningKey: durationpb.New(time.Second),
+				},
+			},
+			res: &command.ChangeSMTPConfigHTTP{
+				ResourceOwner:        "instance",
+				ID:                   "id",
+				Description:          "description",
+				Endpoint:             "endpoint",
+				ExpirationSigningKey: true,
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := updateEmailProviderHTTPToConfig(tt.args.ctx, tt.args.req)
+			assert.Equal(t, tt.res, got)
+		})
+	}
+}

internal/api/grpc/admin/sms.go

@@ -71,8 +71,9 @@ func (s *Server) AddSMSProviderHTTP(ctx context.Context, req *admin_pb.AddSMSPro
 		return nil, err
 	}
 	return &admin_pb.AddSMSProviderHTTPResponse{
-		Details: object.DomainToAddDetailsPb(smsConfig.Details),
-		Id:      smsConfig.ID,
+		Details:    object.DomainToAddDetailsPb(smsConfig.Details),
+		Id:         smsConfig.ID,
+		SigningKey: smsConfig.SigningKey,
 	}, nil
 }
 
@@ -82,7 +83,8 @@ func (s *Server) UpdateSMSProviderHTTP(ctx context.Context, req *admin_pb.Update
 		return nil, err
 	}
 	return &admin_pb.UpdateSMSProviderHTTPResponse{
-		Details: object.DomainToChangeDetailsPb(smsConfig.Details),
+		Details:    object.DomainToChangeDetailsPb(smsConfig.Details),
+		SigningKey: smsConfig.SigningKey,
 	}, nil
 }
 

internal/api/grpc/admin/sms_converter.go

@@ -56,7 +56,8 @@ func SMSConfigToPb(config *query.SMSConfig) settings_pb.SMSConfig {
 func HTTPConfigToPb(http *query.HTTP) *settings_pb.SMSProvider_Http {
 	return &settings_pb.SMSProvider_Http{
 		Http: &settings_pb.HTTPConfig{
-			Endpoint: http.Endpoint,
+			Endpoint:   http.Endpoint,
+			SigningKey: http.SigningKey,
 		},
 	}
 }
@@ -73,6 +74,8 @@ func TwilioConfigToPb(twilio *query.Twilio) *settings_pb.SMSProvider_Twilio {
 
 func smsStateToPb(state domain.SMSConfigState) settings_pb.SMSProviderConfigState {
 	switch state {
+	case domain.SMSConfigStateUnspecified, domain.SMSConfigStateRemoved:
+		return settings_pb.SMSProviderConfigState_SMS_PROVIDER_CONFIG_INACTIVE
 	case domain.SMSConfigStateInactive:
 		return settings_pb.SMSProviderConfigState_SMS_PROVIDER_CONFIG_INACTIVE
 	case domain.SMSConfigStateActive:
@@ -113,10 +116,13 @@ func addSMSConfigHTTPToConfig(ctx context.Context, req *admin_pb.AddSMSProviderH
 }
 
 func updateSMSConfigHTTPToConfig(ctx context.Context, req *admin_pb.UpdateSMSProviderHTTPRequest) *command.ChangeSMSHTTP {
+	// TODO handle expiration, currently only immediate expiration is supported
+	expirationSigningKey := req.GetExpirationSigningKey() != nil
 	return &command.ChangeSMSHTTP{
-		ResourceOwner: authz.GetInstance(ctx).InstanceID(),
-		ID:            req.Id,
-		Description:   gu.Ptr(req.Description),
-		Endpoint:      gu.Ptr(req.Endpoint),
+		ResourceOwner:        authz.GetInstance(ctx).InstanceID(),
+		ID:                   req.Id,
+		Description:          gu.Ptr(req.Description),
+		Endpoint:             gu.Ptr(req.Endpoint),
+		ExpirationSigningKey: expirationSigningKey,
 	}
 }

internal/api/grpc/admin/sms_converters_test.go

@@ -0,0 +1,520 @@
+package admin
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"github.com/muhlemmer/gu"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"google.golang.org/protobuf/types/known/durationpb"
+	"google.golang.org/protobuf/types/known/timestamppb"
+
+	"github.com/zitadel/zitadel/internal/api/authz"
+	"github.com/zitadel/zitadel/internal/command"
+	"github.com/zitadel/zitadel/internal/domain"
+	"github.com/zitadel/zitadel/internal/query"
+	admin_pb "github.com/zitadel/zitadel/pkg/grpc/admin"
+	object_pb "github.com/zitadel/zitadel/pkg/grpc/object"
+	settings_pb "github.com/zitadel/zitadel/pkg/grpc/settings"
+)
+
+func Test_listSMSConfigsToModel(t *testing.T) {
+	type args struct {
+		req *admin_pb.ListSMSProvidersRequest
+	}
+	tests := []struct {
+		name string
+		args args
+		res  *query.SMSConfigsSearchQueries
+	}{
+		{
+			name: "all fields filled",
+			args: args{
+				req: &admin_pb.ListSMSProvidersRequest{
+					Query: &object_pb.ListQuery{
+						Offset: 100,
+						Limit:  100,
+						Asc:    true,
+					},
+				},
+			},
+			res: &query.SMSConfigsSearchQueries{
+				SearchRequest: query.SearchRequest{
+					Offset: 100,
+					Limit:  100,
+					Asc:    true,
+				},
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := listSMSConfigsToModel(tt.args.req)
+			require.NoError(t, err)
+			assert.Equal(t, tt.res, got)
+		})
+	}
+}
+
+func Test_SMSConfigsToPb(t *testing.T) {
+	type args struct {
+		req []*query.SMSConfig
+	}
+	tests := []struct {
+		name string
+		args args
+		res  []*settings_pb.SMSProvider
+	}{
+		{
+			name: "all fields filled",
+			args: args{
+				req: []*query.SMSConfig{
+					{
+						CreationDate:  time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC),
+						ChangeDate:    time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC),
+						ResourceOwner: "resourceowner",
+						AggregateID:   "agg",
+						ID:            "id",
+						Sequence:      1,
+						Description:   "description",
+						TwilioConfig: &query.Twilio{
+							SID:              "sid",
+							Token:            nil,
+							SenderNumber:     "sender",
+							VerifyServiceSID: "verify",
+						},
+						State: 1,
+					},
+					{
+						CreationDate:  time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC),
+						ChangeDate:    time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC),
+						ResourceOwner: "resourceowner",
+						AggregateID:   "agg",
+						ID:            "id",
+						Sequence:      1,
+						Description:   "description",
+						HTTPConfig: &query.HTTP{
+							Endpoint:   "endpoint",
+							SigningKey: "key",
+						},
+						State: 1,
+					},
+				},
+			},
+			res: []*settings_pb.SMSProvider{
+				{
+					Details: &object_pb.ObjectDetails{
+						Sequence:      1,
+						CreationDate:  timestamppb.New(time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC)),
+						ChangeDate:    timestamppb.New(time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC)),
+						ResourceOwner: "resourceowner",
+					},
+					Id:          "id",
+					State:       1,
+					Description: "description",
+					Config: &settings_pb.SMSProvider_Twilio{
+						Twilio: &settings_pb.TwilioConfig{
+							Sid:              "sid",
+							SenderNumber:     "sender",
+							VerifyServiceSid: "verify",
+						},
+					},
+				},
+				{
+					Details: &object_pb.ObjectDetails{
+						Sequence:      1,
+						CreationDate:  timestamppb.New(time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC)),
+						ChangeDate:    timestamppb.New(time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC)),
+						ResourceOwner: "resourceowner",
+					},
+					Id:          "id",
+					State:       1,
+					Description: "description",
+					Config: &settings_pb.SMSProvider_Http{
+						Http: &settings_pb.HTTPConfig{
+							Endpoint:   "endpoint",
+							SigningKey: "key",
+						},
+					},
+				},
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := SMSConfigsToPb(tt.args.req)
+			assert.Equal(t, tt.res, got)
+		})
+	}
+}
+
+func Test_SMSConfigToProviderPb(t *testing.T) {
+	type args struct {
+		req *query.SMSConfig
+	}
+	tests := []struct {
+		name string
+		args args
+		res  *settings_pb.SMSProvider
+	}{
+		{
+			name: "all fields filled, twilio",
+			args: args{
+				req: &query.SMSConfig{
+
+					CreationDate:  time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC),
+					ChangeDate:    time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC),
+					ResourceOwner: "resourceowner",
+					AggregateID:   "agg",
+					ID:            "id",
+					Sequence:      1,
+					Description:   "description",
+					TwilioConfig: &query.Twilio{
+						SID:              "sid",
+						Token:            nil,
+						SenderNumber:     "sender",
+						VerifyServiceSID: "verify",
+					},
+					State: 1,
+				},
+			},
+			res: &settings_pb.SMSProvider{
+				Details: &object_pb.ObjectDetails{
+					Sequence:      1,
+					CreationDate:  timestamppb.New(time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC)),
+					ChangeDate:    timestamppb.New(time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC)),
+					ResourceOwner: "resourceowner",
+				},
+				Id:          "id",
+				State:       1,
+				Description: "description",
+				Config: &settings_pb.SMSProvider_Twilio{
+					Twilio: &settings_pb.TwilioConfig{
+						Sid:              "sid",
+						SenderNumber:     "sender",
+						VerifyServiceSid: "verify",
+					},
+				},
+			},
+		},
+		{
+			name: "all fields filled, http",
+			args: args{
+				req: &query.SMSConfig{
+					CreationDate:  time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC),
+					ChangeDate:    time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC),
+					ResourceOwner: "resourceowner",
+					AggregateID:   "agg",
+					ID:            "id",
+					Sequence:      1,
+					Description:   "description",
+					HTTPConfig: &query.HTTP{
+						Endpoint:   "endpoint",
+						SigningKey: "key",
+					},
+					State: 1,
+				},
+			},
+			res: &settings_pb.SMSProvider{
+				Details: &object_pb.ObjectDetails{
+					Sequence:      1,
+					CreationDate:  timestamppb.New(time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC)),
+					ChangeDate:    timestamppb.New(time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC)),
+					ResourceOwner: "resourceowner",
+				},
+				Id:          "id",
+				State:       1,
+				Description: "description",
+				Config: &settings_pb.SMSProvider_Http{
+					Http: &settings_pb.HTTPConfig{
+						Endpoint:   "endpoint",
+						SigningKey: "key",
+					},
+				},
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := SMSConfigToProviderPb(tt.args.req)
+			assert.Equal(t, tt.res, got)
+		})
+	}
+}
+
+func Test_smsStateToPb(t *testing.T) {
+	type args struct {
+		req domain.SMSConfigState
+	}
+	tests := []struct {
+		name string
+		args args
+		res  settings_pb.SMSProviderConfigState
+	}{
+		{
+			name: "unspecified",
+			args: args{
+				req: domain.SMSConfigStateUnspecified,
+			},
+			res: settings_pb.SMSProviderConfigState_SMS_PROVIDER_CONFIG_INACTIVE,
+		},
+		{
+			name: "removed",
+			args: args{
+				req: domain.SMSConfigStateRemoved,
+			},
+			res: settings_pb.SMSProviderConfigState_SMS_PROVIDER_CONFIG_INACTIVE,
+		},
+		{
+			name: "active",
+			args: args{
+				req: domain.SMSConfigStateActive,
+			},
+			res: settings_pb.SMSProviderConfigState_SMS_PROVIDER_CONFIG_ACTIVE,
+		},
+		{
+			name: "inactive",
+			args: args{
+				req: domain.SMSConfigStateInactive,
+			},
+			res: settings_pb.SMSProviderConfigState_SMS_PROVIDER_CONFIG_INACTIVE,
+		},
+		{
+			name: "default",
+			args: args{
+				req: 100,
+			},
+			res: settings_pb.SMSProviderConfigState_SMS_PROVIDER_CONFIG_INACTIVE,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := smsStateToPb(tt.args.req)
+			assert.Equal(t, tt.res, got)
+		})
+	}
+}
+
+func Test_HTTPConfigToPb(t *testing.T) {
+	type args struct {
+		req *query.HTTP
+	}
+	tests := []struct {
+		name string
+		args args
+		res  *settings_pb.SMSProvider_Http
+	}{
+		{
+			name: "all fields filled",
+			args: args{
+				req: &query.HTTP{
+					Endpoint:   "endpoint",
+					SigningKey: "key",
+				},
+			},
+			res: &settings_pb.SMSProvider_Http{
+				Http: &settings_pb.HTTPConfig{
+					Endpoint:   "endpoint",
+					SigningKey: "key",
+				},
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := HTTPConfigToPb(tt.args.req)
+			assert.Equal(t, tt.res, got)
+		})
+	}
+}
+
+func Test_TwilioConfigToPb(t *testing.T) {
+	type args struct {
+		req *query.Twilio
+	}
+	tests := []struct {
+		name string
+		args args
+		res  *settings_pb.SMSProvider_Twilio
+	}{
+		{
+			name: "all fields filled",
+			args: args{
+				req: &query.Twilio{
+					SID:              "sid",
+					SenderNumber:     "sender",
+					VerifyServiceSID: "verify",
+				},
+			},
+			res: &settings_pb.SMSProvider_Twilio{
+				Twilio: &settings_pb.TwilioConfig{
+					Sid:              "sid",
+					SenderNumber:     "sender",
+					VerifyServiceSid: "verify",
+				},
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := TwilioConfigToPb(tt.args.req)
+			assert.Equal(t, tt.res, got)
+		})
+	}
+}
+
+func Test_addSMSConfigTwilioToConfig(t *testing.T) {
+	type args struct {
+		ctx context.Context
+		req *admin_pb.AddSMSProviderTwilioRequest
+	}
+	tests := []struct {
+		name string
+		args args
+		res  *command.AddTwilioConfig
+	}{
+		{
+			name: "all fields filled",
+			args: args{
+				ctx: authz.WithInstanceID(context.Background(), "instance"),
+				req: &admin_pb.AddSMSProviderTwilioRequest{
+					Sid:              "sid",
+					Token:            "token",
+					SenderNumber:     "sender",
+					Description:      "description",
+					VerifyServiceSid: "verify",
+				},
+			},
+			res: &command.AddTwilioConfig{
+				ResourceOwner:    "instance",
+				ID:               "",
+				Description:      "description",
+				SID:              "sid",
+				Token:            "token",
+				SenderNumber:     "sender",
+				VerifyServiceSID: "verify",
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := addSMSConfigTwilioToConfig(tt.args.ctx, tt.args.req)
+			assert.Equal(t, tt.res, got)
+		})
+	}
+}
+
+func Test_updateSMSConfigTwilioToConfig(t *testing.T) {
+	type args struct {
+		ctx context.Context
+		req *admin_pb.UpdateSMSProviderTwilioRequest
+	}
+	tests := []struct {
+		name string
+		args args
+		res  *command.ChangeTwilioConfig
+	}{
+		{
+			name: "all fields filled",
+			args: args{
+				ctx: authz.WithInstanceID(context.Background(), "instance"),
+				req: &admin_pb.UpdateSMSProviderTwilioRequest{
+					Id:               "id",
+					Sid:              "sid",
+					SenderNumber:     "sender",
+					Description:      "description",
+					VerifyServiceSid: "verify",
+				},
+			},
+			res: &command.ChangeTwilioConfig{
+				ResourceOwner:    "instance",
+				ID:               "id",
+				Description:      gu.Ptr("description"),
+				SID:              gu.Ptr("sid"),
+				SenderNumber:     gu.Ptr("sender"),
+				VerifyServiceSID: gu.Ptr("verify"),
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := updateSMSConfigTwilioToConfig(tt.args.ctx, tt.args.req)
+			assert.Equal(t, tt.res, got)
+		})
+	}
+}
+
+func Test_addSMSConfigHTTPToConfig(t *testing.T) {
+	type args struct {
+		ctx context.Context
+		req *admin_pb.AddSMSProviderHTTPRequest
+	}
+	tests := []struct {
+		name string
+		args args
+		res  *command.AddSMSHTTP
+	}{
+		{
+			name: "all fields filled",
+			args: args{
+				ctx: authz.WithInstanceID(context.Background(), "instance"),
+				req: &admin_pb.AddSMSProviderHTTPRequest{
+					Endpoint:    "endpoint",
+					Description: "description",
+				},
+			},
+			res: &command.AddSMSHTTP{
+				ResourceOwner: "instance",
+				ID:            "",
+				Description:   "description",
+				Endpoint:      "endpoint",
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := addSMSConfigHTTPToConfig(tt.args.ctx, tt.args.req)
+			assert.Equal(t, tt.res, got)
+		})
+	}
+}
+
+func Test_updateSMSConfigHTTPToConfig(t *testing.T) {
+	type args struct {
+		ctx context.Context
+		req *admin_pb.UpdateSMSProviderHTTPRequest
+	}
+	tests := []struct {
+		name string
+		args args
+		res  *command.ChangeSMSHTTP
+	}{
+		{
+			name: "all fields filled",
+			args: args{
+				ctx: authz.WithInstanceID(context.Background(), "instance"),
+				req: &admin_pb.UpdateSMSProviderHTTPRequest{
+					Id:                   "id",
+					Endpoint:             "endpoint",
+					Description:          "description",
+					ExpirationSigningKey: durationpb.New(time.Second),
+				},
+			},
+			res: &command.ChangeSMSHTTP{
+				ResourceOwner:        "instance",
+				ID:                   "id",
+				Description:          gu.Ptr("description"),
+				Endpoint:             gu.Ptr("endpoint"),
+				ExpirationSigningKey: true,
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := updateSMSConfigHTTPToConfig(tt.args.ctx, tt.args.req)
+			assert.Equal(t, tt.res, got)
+		})
+	}
+}

internal/api/grpc/object/converter_test.go

@@ -0,0 +1,63 @@
+package object
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	object_pb "github.com/zitadel/zitadel/pkg/grpc/object"
+)
+
+func Test_ListQueryToModel(t *testing.T) {
+	type args struct {
+		req *object_pb.ListQuery
+	}
+	type res struct {
+		offset, limit uint64
+		asc           bool
+	}
+	tests := []struct {
+		name string
+		args args
+		res  res
+	}{
+		{
+			name: "all fields filled",
+			args: args{
+				req: &object_pb.ListQuery{
+					Offset: 100,
+					Limit:  100,
+					Asc:    true,
+				},
+			},
+			res: res{
+				offset: 100,
+				limit:  100,
+				asc:    true,
+			},
+		},
+		{
+			name: "all fields empty",
+			args: args{
+				req: &object_pb.ListQuery{
+					Offset: 0,
+					Limit:  0,
+					Asc:    false,
+				},
+			},
+			res: res{
+				offset: 0,
+				limit:  0,
+				asc:    false,
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			offset, limit, asc := ListQueryToModel(tt.args.req)
+			assert.Equal(t, tt.res.offset, offset)
+			assert.Equal(t, tt.res.limit, limit)
+			assert.Equal(t, tt.res.asc, asc)
+		})
+	}
+}

internal/command/instance_smtp_config_model.go

@@ -201,7 +201,12 @@ func (wm *IAMSMTPConfigWriteModel) NewChangedEvent(ctx context.Context, aggregat
 	return changeEvent, true, nil
 }
 
-func (wm *IAMSMTPConfigWriteModel) NewHTTPChangedEvent(ctx context.Context, aggregate *eventstore.Aggregate, id, description, endpoint string) (*instance.SMTPConfigHTTPChangedEvent, bool, error) {
+func (wm *IAMSMTPConfigWriteModel) NewHTTPChangedEvent(
+	ctx context.Context,
+	aggregate *eventstore.Aggregate,
+	id, description, endpoint string,
+	signingKey *crypto.CryptoValue,
+) (*instance.SMTPConfigHTTPChangedEvent, bool, error) {
 	changes := make([]instance.SMTPConfigHTTPChanges, 0)
 	var err error
 	if wm.HTTPConfig == nil {
@@ -217,6 +222,10 @@ func (wm *IAMSMTPConfigWriteModel) NewHTTPChangedEvent(ctx context.Context, aggr
 	if wm.HTTPConfig.Endpoint != endpoint {
 		changes = append(changes, instance.ChangeSMTPConfigHTTPEndpoint(endpoint))
 	}
+	// if signingkey is set, update it as it is encrypted
+	if signingKey != nil {
+		changes = append(changes, instance.ChangeSMTPConfigHTTPSigningKey(signingKey))
+	}
 	if len(changes) == 0 {
 		return nil, false, nil
 	}
@@ -251,7 +260,8 @@ func (wm *IAMSMTPConfigWriteModel) reduceSMTPConfigAddedEvent(e *instance.SMTPCo
 func (wm *IAMSMTPConfigWriteModel) reduceSMTPConfigHTTPAddedEvent(e *instance.SMTPConfigHTTPAddedEvent) {
 	wm.Description = e.Description
 	wm.HTTPConfig = &HTTPConfig{
-		Endpoint: e.Endpoint,
+		Endpoint:   e.Endpoint,
+		SigningKey: e.SigningKey,
 	}
 	wm.State = domain.SMTPConfigStateInactive
 	// If ID has empty value we're dealing with the old and unique smtp settings
@@ -313,6 +323,9 @@ func (wm *IAMSMTPConfigWriteModel) reduceSMTPConfigHTTPChangedEvent(e *instance.
 	if e.Endpoint != nil {
 		wm.HTTPConfig.Endpoint = *e.Endpoint
 	}
+	if e.SigningKey != nil {
+		wm.HTTPConfig.SigningKey = e.SigningKey
+	}
 
 	// If ID has empty value we're dealing with the old and unique smtp settings
 	// These would be the default values for ID and State

internal/command/sms_config.go

@@ -157,6 +157,7 @@ type AddSMSHTTP struct {
 
 	Description string
 	Endpoint    string
+	SigningKey  string
 }
 
 func (c *Commands) AddSMSConfigHTTP(ctx context.Context, config *AddSMSHTTP) (err error) {
@@ -174,6 +175,12 @@ func (c *Commands) AddSMSConfigHTTP(ctx context.Context, config *AddSMSHTTP) (er
 		return err
 	}
 
+	code, err := c.newSigningKey(ctx, c.eventstore.Filter, c.smsEncryption) //nolint
+	if err != nil {
+		return err
+	}
+	config.SigningKey = code.PlainCode()
+
 	err = c.pushAppendAndReduce(ctx,
 		smsConfigWriteModel,
 		instance.NewSMSConfigHTTPAddedEvent(
@@ -182,6 +189,7 @@ func (c *Commands) AddSMSConfigHTTP(ctx context.Context, config *AddSMSHTTP) (er
 			config.ID,
 			config.Description,
 			config.Endpoint,
+			code.Crypted,
 		),
 	)
 	if err != nil {
@@ -196,8 +204,10 @@ type ChangeSMSHTTP struct {
 	ResourceOwner string
 	ID            string
 
-	Description *string
-	Endpoint    *string
+	Description          *string
+	Endpoint             *string
+	ExpirationSigningKey bool
+	SigningKey           *string
 }
 
 func (c *Commands) ChangeSMSConfigHTTP(ctx context.Context, config *ChangeSMSHTTP) (err error) {
@@ -214,12 +224,24 @@ func (c *Commands) ChangeSMSConfigHTTP(ctx context.Context, config *ChangeSMSHTT
 	if !smsConfigWriteModel.State.Exists() || smsConfigWriteModel.HTTP == nil {
 		return zerrors.ThrowNotFound(nil, "COMMAND-6NW4I5Kqzj", "Errors.SMSConfig.NotFound")
 	}
+
+	var changedSigningKey *crypto.CryptoValue
+	if config.ExpirationSigningKey {
+		code, err := c.newSigningKey(ctx, c.eventstore.Filter, c.smtpEncryption) //nolint
+		if err != nil {
+			return err
+		}
+		changedSigningKey = code.Crypted
+		config.SigningKey = &code.Plain
+	}
+
 	changedEvent, hasChanged, err := smsConfigWriteModel.NewHTTPChangedEvent(
 		ctx,
 		InstanceAggregateFromWriteModel(&smsConfigWriteModel.WriteModel),
 		config.ID,
 		config.Description,
-		config.Endpoint)
+		config.Endpoint,
+		changedSigningKey)
 	if err != nil {
 		return err
 	}

internal/command/sms_config_model.go

@@ -27,7 +27,8 @@ type TwilioConfig struct {
 }
 
 type HTTPConfig struct {
-	Endpoint string
+	Endpoint   string
+	SigningKey *crypto.CryptoValue
 }
 
 func NewIAMSMSConfigWriteModel(instanceID, id string) *IAMSMSConfigWriteModel {
@@ -82,7 +83,8 @@ func (wm *IAMSMSConfigWriteModel) Reduce() error {
 				continue
 			}
 			wm.HTTP = &HTTPConfig{
-				Endpoint: e.Endpoint,
+				Endpoint:   e.Endpoint,
+				SigningKey: e.SigningKey,
 			}
 			wm.Description = e.Description
 			wm.State = domain.SMSConfigStateInactive
@@ -96,6 +98,9 @@ func (wm *IAMSMSConfigWriteModel) Reduce() error {
 			if e.Endpoint != nil {
 				wm.HTTP.Endpoint = *e.Endpoint
 			}
+			if e.SigningKey != nil {
+				wm.HTTP.SigningKey = e.SigningKey
+			}
 		case *instance.SMSConfigTwilioActivatedEvent:
 			if wm.ID != e.ID {
 				wm.State = domain.SMSConfigStateInactive
@@ -189,7 +194,13 @@ func (wm *IAMSMSConfigWriteModel) NewTwilioChangedEvent(ctx context.Context, agg
 	return changeEvent, true, nil
 }
 
-func (wm *IAMSMSConfigWriteModel) NewHTTPChangedEvent(ctx context.Context, aggregate *eventstore.Aggregate, id string, description, endpoint *string) (*instance.SMSConfigHTTPChangedEvent, bool, error) {
+func (wm *IAMSMSConfigWriteModel) NewHTTPChangedEvent(
+	ctx context.Context,
+	aggregate *eventstore.Aggregate,
+	id string,
+	description, endpoint *string,
+	signingKey *crypto.CryptoValue,
+) (*instance.SMSConfigHTTPChangedEvent, bool, error) {
 	changes := make([]instance.SMSConfigHTTPChanges, 0)
 	var err error
 
@@ -203,6 +214,10 @@ func (wm *IAMSMSConfigWriteModel) NewHTTPChangedEvent(ctx context.Context, aggre
 	if endpoint != nil && wm.HTTP.Endpoint != *endpoint {
 		changes = append(changes, instance.ChangeSMSConfigHTTPEndpoint(*endpoint))
 	}
+	// if signingkey is set, update it as it is encrypted
+	if signingKey != nil {
+		changes = append(changes, instance.ChangeSMSConfigHTTPSigningKey(signingKey))
+	}
 
 	if len(changes) == 0 {
 		return nil, false, nil

internal/command/sms_config_test.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"testing"
+	"time"
 
 	"github.com/muhlemmer/gu"
 	"github.com/stretchr/testify/assert"
@@ -306,9 +307,11 @@ func TestCommandSide_ChangeSMSConfigTwilio(t *testing.T) {
 
 func TestCommandSide_AddSMSConfigHTTP(t *testing.T) {
 	type fields struct {
-		eventstore  func(t *testing.T) *eventstore.Eventstore
-		idGenerator id.Generator
-		alg         crypto.EncryptionAlgorithm
+		eventstore                  func(t *testing.T) *eventstore.Eventstore
+		idGenerator                 id.Generator
+		newEncryptedCodeWithDefault encryptedCodeWithDefaultFunc
+		defaultSecretGenerators     *SecretGenerators
+		alg                         crypto.EncryptionAlgorithm
 	}
 	type args struct {
 		ctx  context.Context
@@ -351,10 +354,18 @@ func TestCommandSide_AddSMSConfigHTTP(t *testing.T) {
 							"providerid",
 							"description",
 							"endpoint",
+							&crypto.CryptoValue{
+								CryptoType: crypto.TypeEncryption,
+								Algorithm:  "enc",
+								KeyID:      "id",
+								Crypted:    []byte("12345678"),
+							},
 						),
 					),
 				),
-				idGenerator: id_mock.NewIDGeneratorExpectIDs(t, "providerid"),
+				idGenerator:                 id_mock.NewIDGeneratorExpectIDs(t, "providerid"),
+				newEncryptedCodeWithDefault: mockEncryptedCodeWithDefault("12345678", time.Hour),
+				defaultSecretGenerators:     &SecretGenerators{},
 			},
 			args: args{
 				ctx: context.Background(),
@@ -374,9 +385,11 @@ func TestCommandSide_AddSMSConfigHTTP(t *testing.T) {
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
 			r := &Commands{
-				eventstore:    tt.fields.eventstore(t),
-				idGenerator:   tt.fields.idGenerator,
-				smsEncryption: tt.fields.alg,
+				eventstore:                  tt.fields.eventstore(t),
+				idGenerator:                 tt.fields.idGenerator,
+				newEncryptedCodeWithDefault: tt.fields.newEncryptedCodeWithDefault,
+				defaultSecretGenerators:     tt.fields.defaultSecretGenerators,
+				smsEncryption:               tt.fields.alg,
 			}
 			err := r.AddSMSConfigHTTP(tt.args.ctx, tt.args.http)
 			if tt.res.err == nil {
@@ -394,7 +407,9 @@ func TestCommandSide_AddSMSConfigHTTP(t *testing.T) {
 
 func TestCommandSide_ChangeSMSConfigHTTP(t *testing.T) {
 	type fields struct {
-		eventstore func(*testing.T) *eventstore.Eventstore
+		eventstore                  func(*testing.T) *eventstore.Eventstore
+		newEncryptedCodeWithDefault encryptedCodeWithDefaultFunc
+		defaultSecretGenerators     *SecretGenerators
 	}
 	type args struct {
 		ctx  context.Context
@@ -474,6 +489,12 @@ func TestCommandSide_ChangeSMSConfigHTTP(t *testing.T) {
 								"providerid",
 								"description",
 								"endpoint",
+								&crypto.CryptoValue{
+									CryptoType: crypto.TypeEncryption,
+									Algorithm:  "enc",
+									KeyID:      "id",
+									Crypted:    []byte("12345678"),
+								},
 							),
 						),
 					),
@@ -505,6 +526,12 @@ func TestCommandSide_ChangeSMSConfigHTTP(t *testing.T) {
 								"providerid",
 								"description",
 								"endpoint",
+								&crypto.CryptoValue{
+									CryptoType: crypto.TypeEncryption,
+									Algorithm:  "enc",
+									KeyID:      "id",
+									Crypted:    []byte("12345678"),
+								},
 							),
 						),
 					),
@@ -514,17 +541,26 @@ func TestCommandSide_ChangeSMSConfigHTTP(t *testing.T) {
 							"providerid",
 							"endpoint2",
 							"description2",
+							&crypto.CryptoValue{
+								CryptoType: crypto.TypeEncryption,
+								Algorithm:  "enc",
+								KeyID:      "id",
+								Crypted:    []byte("87654321"),
+							},
 						),
 					),
 				),
+				newEncryptedCodeWithDefault: mockEncryptedCodeWithDefault("87654321", time.Hour),
+				defaultSecretGenerators:     &SecretGenerators{},
 			},
 			args: args{
 				ctx: context.Background(),
 				http: &ChangeSMSHTTP{
-					ResourceOwner: "INSTANCE",
-					ID:            "providerid",
-					Description:   gu.Ptr("description2"),
-					Endpoint:      gu.Ptr("endpoint2"),
+					ResourceOwner:        "INSTANCE",
+					ID:                   "providerid",
+					Description:          gu.Ptr("description2"),
+					Endpoint:             gu.Ptr("endpoint2"),
+					ExpirationSigningKey: true,
 				},
 			},
 			res: res{
@@ -537,7 +573,9 @@ func TestCommandSide_ChangeSMSConfigHTTP(t *testing.T) {
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
 			r := &Commands{
-				eventstore: tt.fields.eventstore(t),
+				eventstore:                  tt.fields.eventstore(t),
+				newEncryptedCodeWithDefault: tt.fields.newEncryptedCodeWithDefault,
+				defaultSecretGenerators:     tt.fields.defaultSecretGenerators,
 			}
 			err := r.ChangeSMSConfigHTTP(tt.args.ctx, tt.args.http)
 			if tt.res.err == nil {
@@ -707,6 +745,12 @@ func TestCommandSide_ActivateSMSConfig(t *testing.T) {
 								"providerid",
 								"description",
 								"endpoint",
+								&crypto.CryptoValue{
+									CryptoType: crypto.TypeEncryption,
+									Algorithm:  "enc",
+									KeyID:      "id",
+									Crypted:    []byte("12345678"),
+								},
 							),
 						),
 					),
@@ -917,6 +961,12 @@ func TestCommandSide_DeactivateSMSConfig(t *testing.T) {
 								"providerid",
 								"description",
 								"endpoint",
+								&crypto.CryptoValue{
+									CryptoType: crypto.TypeEncryption,
+									Algorithm:  "enc",
+									KeyID:      "id",
+									Crypted:    []byte("12345678"),
+								},
 							),
 						),
 						eventFromEventPusher(
@@ -1083,6 +1133,12 @@ func TestCommandSide_RemoveSMSConfig(t *testing.T) {
 								"providerid",
 								"description",
 								"endpoint",
+								&crypto.CryptoValue{
+									CryptoType: crypto.TypeEncryption,
+									Algorithm:  "enc",
+									KeyID:      "id",
+									Crypted:    []byte("12345678"),
+								},
 							),
 						),
 					),
@@ -1141,10 +1197,11 @@ func newSMSConfigTwilioChangedEvent(ctx context.Context, id, sid, senderName, de
 	return event
 }
 
-func newSMSConfigHTTPChangedEvent(ctx context.Context, id, endpoint, description string) *instance.SMSConfigHTTPChangedEvent {
+func newSMSConfigHTTPChangedEvent(ctx context.Context, id, endpoint, description string, signingKey *crypto.CryptoValue) *instance.SMSConfigHTTPChangedEvent {
 	changes := []instance.SMSConfigHTTPChanges{
 		instance.ChangeSMSConfigHTTPEndpoint(endpoint),
 		instance.ChangeSMSConfigHTTPDescription(description),
+		instance.ChangeSMSConfigHTTPSigningKey(signingKey),
 	}
 	event, _ := instance.NewSMSConfigHTTPChangedEvent(ctx,
 		&instance.NewAggregate("INSTANCE").Aggregate,

internal/command/smtp.go

@@ -230,6 +230,7 @@ type AddSMTPConfigHTTP struct {
 
 	Description string
 	Endpoint    string
+	SigningKey  string
 }
 
 func (c *Commands) AddSMTPConfigHTTP(ctx context.Context, config *AddSMTPConfigHTTP) (err error) {
@@ -248,12 +249,19 @@ func (c *Commands) AddSMTPConfigHTTP(ctx context.Context, config *AddSMTPConfigH
 		return err
 	}
 
+	code, err := c.newSigningKey(ctx, c.eventstore.Filter, c.smtpEncryption) //nolint
+	if err != nil {
+		return err
+	}
+	config.SigningKey = code.PlainCode()
+
 	err = c.pushAppendAndReduce(ctx, smtpConfigWriteModel, instance.NewSMTPConfigHTTPAddedEvent(
 		ctx,
 		InstanceAggregateFromWriteModel(&smtpConfigWriteModel.WriteModel),
 		config.ID,
 		config.Description,
 		config.Endpoint,
+		code.Crypted,
 	))
 	if err != nil {
 		return err
@@ -267,8 +275,10 @@ type ChangeSMTPConfigHTTP struct {
 	ResourceOwner string
 	ID            string
 
-	Description string
-	Endpoint    string
+	Description          string
+	Endpoint             string
+	ExpirationSigningKey bool
+	SigningKey           *string
 }
 
 func (c *Commands) ChangeSMTPConfigHTTP(ctx context.Context, config *ChangeSMTPConfigHTTP) (err error) {
@@ -288,12 +298,23 @@ func (c *Commands) ChangeSMTPConfigHTTP(ctx context.Context, config *ChangeSMTPC
 		return zerrors.ThrowNotFound(nil, "COMMAND-xIrdledqv4", "Errors.SMTPConfig.NotFound")
 	}
 
+	var changedSigningKey *crypto.CryptoValue
+	if config.ExpirationSigningKey {
+		code, err := c.newSigningKey(ctx, c.eventstore.Filter, c.smtpEncryption) //nolint
+		if err != nil {
+			return err
+		}
+		changedSigningKey = code.Crypted
+		config.SigningKey = &code.Plain
+	}
+
 	changedEvent, hasChanged, err := smtpConfigWriteModel.NewHTTPChangedEvent(
 		ctx,
 		InstanceAggregateFromWriteModel(&smtpConfigWriteModel.WriteModel),
 		config.ID,
 		config.Description,
 		config.Endpoint,
+		changedSigningKey,
 	)
 	if err != nil {
 		return err

internal/command/smtp_test.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"testing"
+	"time"
 
 	"github.com/stretchr/testify/assert"
 	"go.uber.org/mock/gomock"
@@ -902,8 +903,10 @@ func TestCommandSide_ChangeSMTPConfigPassword(t *testing.T) {
 
 func TestCommandSide_AddSMTPConfigHTTP(t *testing.T) {
 	type fields struct {
-		eventstore  func(t *testing.T) *eventstore.Eventstore
-		idGenerator id.Generator
+		eventstore                  func(t *testing.T) *eventstore.Eventstore
+		newEncryptedCodeWithDefault encryptedCodeWithDefaultFunc
+		defaultSecretGenerators     *SecretGenerators
+		idGenerator                 id.Generator
 	}
 	type args struct {
 		http *AddSMTPConfigHTTP
@@ -944,10 +947,18 @@ func TestCommandSide_AddSMTPConfigHTTP(t *testing.T) {
 							"configid",
 							"test",
 							"endpoint",
+							&crypto.CryptoValue{
+								CryptoType: crypto.TypeEncryption,
+								Algorithm:  "enc",
+								KeyID:      "id",
+								Crypted:    []byte("12345678"),
+							},
 						),
 					),
 				),
-				idGenerator: id_mock.NewIDGeneratorExpectIDs(t, "configid"),
+				idGenerator:                 id_mock.NewIDGeneratorExpectIDs(t, "configid"),
+				newEncryptedCodeWithDefault: mockEncryptedCodeWithDefault("12345678", time.Hour),
+				defaultSecretGenerators:     &SecretGenerators{},
 			},
 			args: args{
 				http: &AddSMTPConfigHTTP{
@@ -966,8 +977,10 @@ func TestCommandSide_AddSMTPConfigHTTP(t *testing.T) {
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
 			r := &Commands{
-				eventstore:  tt.fields.eventstore(t),
-				idGenerator: tt.fields.idGenerator,
+				eventstore:                  tt.fields.eventstore(t),
+				idGenerator:                 tt.fields.idGenerator,
+				newEncryptedCodeWithDefault: tt.fields.newEncryptedCodeWithDefault,
+				defaultSecretGenerators:     tt.fields.defaultSecretGenerators,
 			}
 			err := r.AddSMTPConfigHTTP(context.Background(), tt.args.http)
 			if tt.res.err == nil {
@@ -986,7 +999,9 @@ func TestCommandSide_AddSMTPConfigHTTP(t *testing.T) {
 
 func TestCommandSide_ChangeSMTPConfigHTTP(t *testing.T) {
 	type fields struct {
-		eventstore func(t *testing.T) *eventstore.Eventstore
+		eventstore                  func(t *testing.T) *eventstore.Eventstore
+		newEncryptedCodeWithDefault encryptedCodeWithDefaultFunc
+		defaultSecretGenerators     *SecretGenerators
 	}
 	type args struct {
 		http *ChangeSMTPConfigHTTP
@@ -1063,6 +1078,12 @@ func TestCommandSide_ChangeSMTPConfigHTTP(t *testing.T) {
 								"ID",
 								"test",
 								"endpoint",
+								&crypto.CryptoValue{
+									CryptoType: crypto.TypeEncryption,
+									Algorithm:  "enc",
+									KeyID:      "id",
+									Crypted:    []byte("12345678"),
+								},
 							),
 						),
 					),
@@ -1094,6 +1115,12 @@ func TestCommandSide_ChangeSMTPConfigHTTP(t *testing.T) {
 								"ID",
 								"",
 								"endpoint",
+								&crypto.CryptoValue{
+									CryptoType: crypto.TypeEncryption,
+									Algorithm:  "enc",
+									KeyID:      "id",
+									Crypted:    []byte("12345678"),
+								},
 							),
 						),
 					),
@@ -1103,16 +1130,25 @@ func TestCommandSide_ChangeSMTPConfigHTTP(t *testing.T) {
 							"ID",
 							"test",
 							"endpoint2",
+							&crypto.CryptoValue{
+								CryptoType: crypto.TypeEncryption,
+								Algorithm:  "enc",
+								KeyID:      "id",
+								Crypted:    []byte("87654321"),
+							},
 						),
 					),
 				),
+				newEncryptedCodeWithDefault: mockEncryptedCodeWithDefault("87654321", time.Hour),
+				defaultSecretGenerators:     &SecretGenerators{},
 			},
 			args: args{
 				http: &ChangeSMTPConfigHTTP{
-					ResourceOwner: "INSTANCE",
-					ID:            "ID",
-					Description:   "test",
-					Endpoint:      "endpoint2",
+					ResourceOwner:        "INSTANCE",
+					ID:                   "ID",
+					Description:          "test",
+					Endpoint:             "endpoint2",
+					ExpirationSigningKey: true,
 				},
 			},
 			res: res{
@@ -1125,7 +1161,9 @@ func TestCommandSide_ChangeSMTPConfigHTTP(t *testing.T) {
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
 			r := &Commands{
-				eventstore: tt.fields.eventstore(t),
+				eventstore:                  tt.fields.eventstore(t),
+				newEncryptedCodeWithDefault: tt.fields.newEncryptedCodeWithDefault,
+				defaultSecretGenerators:     tt.fields.defaultSecretGenerators,
 			}
 			err := r.ChangeSMTPConfigHTTP(context.Background(), tt.args.http)
 			if tt.res.err == nil {
@@ -1300,6 +1338,12 @@ func TestCommandSide_ActivateSMTPConfig(t *testing.T) {
 								"ID",
 								"test",
 								"endpoint",
+								&crypto.CryptoValue{
+									CryptoType: crypto.TypeEncryption,
+									Algorithm:  "enc",
+									KeyID:      "id",
+									Crypted:    []byte("12345678"),
+								},
 							),
 						),
 					),
@@ -1511,6 +1555,12 @@ func TestCommandSide_DeactivateSMTPConfig(t *testing.T) {
 								"ID",
 								"test",
 								"endpoint",
+								&crypto.CryptoValue{
+									CryptoType: crypto.TypeEncryption,
+									Algorithm:  "enc",
+									KeyID:      "id",
+									Crypted:    []byte("12345678"),
+								},
 							),
 						),
 						eventFromEventPusher(
@@ -1677,6 +1727,12 @@ func TestCommandSide_RemoveSMTPConfig(t *testing.T) {
 								"ID",
 								"test",
 								"endpoint",
+								&crypto.CryptoValue{
+									CryptoType: crypto.TypeEncryption,
+									Algorithm:  "enc",
+									KeyID:      "id",
+									Crypted:    []byte("12345678"),
+								},
 							),
 						),
 					),
@@ -2051,10 +2107,11 @@ func newSMTPConfigChangedEvent(ctx context.Context, id, description string, tls
 	return event
 }
 
-func newSMTPConfigHTTPChangedEvent(ctx context.Context, id, description, endpoint string) *instance.SMTPConfigHTTPChangedEvent {
+func newSMTPConfigHTTPChangedEvent(ctx context.Context, id, description, endpoint string, signingKey *crypto.CryptoValue) *instance.SMTPConfigHTTPChangedEvent {
 	changes := []instance.SMTPConfigHTTPChanges{
 		instance.ChangeSMTPConfigHTTPDescription(description),
 		instance.ChangeSMTPConfigHTTPEndpoint(endpoint),
+		instance.ChangeSMTPConfigHTTPSigningKey(signingKey),
 	}
 	event, _ := instance.NewSMTPConfigHTTPChangeEvent(ctx,
 		&instance.NewAggregate("INSTANCE").Aggregate,

internal/notification/channels/webhook/channel.go

@@ -12,6 +12,11 @@ import (
 	"github.com/zitadel/zitadel/internal/notification/channels"
 	"github.com/zitadel/zitadel/internal/notification/messages"
 	"github.com/zitadel/zitadel/internal/zerrors"
+	"github.com/zitadel/zitadel/pkg/actions"
+)
+
+const (
+	SigningHeader = "ZITADEL-Signature"
 )
 
 func InitChannel(ctx context.Context, cfg Config) (channels.NotificationChannel, error) {
@@ -39,6 +44,10 @@ func InitChannel(ctx context.Context, cfg Config) (channels.NotificationChannel,
 			req.Header = cfg.Headers
 		}
 		req.Header.Set("Content-Type", "application/json")
+		if cfg.SigningKey != "" {
+			req.Header.Set(SigningHeader, actions.ComputeSignatureHeader(time.Now(), []byte(payload), cfg.SigningKey))
+		}
+
 		resp, err := http.DefaultClient.Do(req)
 		if err != nil {
 			return err

internal/notification/channels/webhook/config.go

@@ -6,9 +6,10 @@ import (
 )
 
 type Config struct {
-	CallURL string
-	Method  string
-	Headers http.Header
+	CallURL    string
+	Method     string
+	Headers    http.Header
+	SigningKey string
 }
 
 func (w *Config) Validate() error {

internal/notification/handlers/config_email.go

@@ -49,9 +49,10 @@ func (n *NotificationQueries) GetActiveEmailConfig(ctx context.Context) (*email.
 		return &email.Config{
 			ProviderConfig: provider,
 			WebhookConfig: &webhook.Config{
-				CallURL: config.HTTPConfig.Endpoint,
-				Method:  http.MethodPost,
-				Headers: nil,
+				CallURL:    config.HTTPConfig.Endpoint,
+				Method:     http.MethodPost,
+				Headers:    nil,
+				SigningKey: config.HTTPConfig.SigningKey,
 			},
 		}, nil
 	}

internal/notification/handlers/config_sms.go

@@ -45,9 +45,10 @@ func (n *NotificationQueries) GetActiveSMSConfig(ctx context.Context) (*sms.Conf
 		return &sms.Config{
 			ProviderConfig: provider,
 			WebhookConfig: &webhook.Config{
-				CallURL: config.HTTPConfig.Endpoint,
-				Method:  http.MethodPost,
-				Headers: nil,
+				CallURL:    config.HTTPConfig.Endpoint,
+				Method:     http.MethodPost,
+				Headers:    nil,
+				SigningKey: config.HTTPConfig.SigningKey,
 			},
 		}, nil
 	}

internal/query/projection/sms.go

@@ -37,6 +37,7 @@ const (
 	SMSHTTPColumnSMSID      = "sms_id"
 	SMSHTTPColumnInstanceID = "instance_id"
 	SMSHTTPColumnEndpoint   = "endpoint"
+	SMSHTTPColumnSigningKey = "signing_key"
 )
 
 type smsConfigProjection struct{}
@@ -80,6 +81,7 @@ func (*smsConfigProjection) Init() *old_handler.Check {
 			handler.NewColumn(SMSHTTPColumnSMSID, handler.ColumnTypeText),
 			handler.NewColumn(SMSHTTPColumnInstanceID, handler.ColumnTypeText),
 			handler.NewColumn(SMSHTTPColumnEndpoint, handler.ColumnTypeText),
+			handler.NewColumn(SMSHTTPColumnSigningKey, handler.ColumnTypeJSONB, handler.Nullable()),
 		},
 			handler.NewPrimaryKey(SMSHTTPColumnInstanceID, SMSHTTPColumnSMSID),
 			smsHTTPTableSuffix,
@@ -286,6 +288,7 @@ func (p *smsConfigProjection) reduceSMSConfigHTTPAdded(event eventstore.Event) (
 				handler.NewCol(SMSHTTPColumnSMSID, e.ID),
 				handler.NewCol(SMSHTTPColumnInstanceID, e.Aggregate().InstanceID),
 				handler.NewCol(SMSHTTPColumnEndpoint, e.Endpoint),
+				handler.NewCol(SMSHTTPColumnSigningKey, e.SigningKey),
 			},
 			handler.WithTableSuffix(smsHTTPTableSuffix),
 		),
@@ -306,21 +309,24 @@ func (p *smsConfigProjection) reduceSMSConfigHTTPChanged(event eventstore.Event)
 	if e.Description != nil {
 		columns = append(columns, handler.NewCol(SMSColumnDescription, *e.Description))
 	}
-	if len(columns) > 0 {
-		stmts = append(stmts, handler.AddUpdateStatement(
-			columns,
-			[]handler.Condition{
-				handler.NewCond(SMSColumnID, e.ID),
-				handler.NewCond(SMSColumnInstanceID, e.Aggregate().InstanceID),
-			},
-		))
-	}
+	stmts = append(stmts, handler.AddUpdateStatement(
+		columns,
+		[]handler.Condition{
+			handler.NewCond(SMSColumnID, e.ID),
+			handler.NewCond(SMSColumnInstanceID, e.Aggregate().InstanceID),
+		},
+	))
 
+	httpColumns := make([]handler.Column, 0)
+	if e.SigningKey != nil {
+		httpColumns = append(httpColumns, handler.NewCol(SMSHTTPColumnSigningKey, e.SigningKey))
+	}
 	if e.Endpoint != nil {
+		httpColumns = append(httpColumns, handler.NewCol(SMSHTTPColumnEndpoint, *e.Endpoint))
+	}
+	if len(httpColumns) > 0 {
 		stmts = append(stmts, handler.AddUpdateStatement(
-			[]handler.Column{
-				handler.NewCol(SMSHTTPColumnEndpoint, *e.Endpoint),
-			},
+			httpColumns,
 			[]handler.Condition{
 				handler.NewCond(SMSHTTPColumnSMSID, e.ID),
 				handler.NewCond(SMSHTTPColumnInstanceID, e.Aggregate().InstanceID),

internal/query/projection/sms_test.go

@@ -302,7 +302,8 @@ func TestSMSProjection_reduces(t *testing.T) {
 						[]byte(`{
 						"id": "id",
 						"description": "description",
-						"endpoint": "endpoint"
+						"endpoint": "endpoint",
+						"signingKey": { "cryptoType": 0, "algorithm": "RSA-265", "keyId": "key-id" }
 					}`),
 					), eventstore.GenericEventMapper[instance.SMSConfigHTTPAddedEvent]),
 			},
@@ -327,11 +328,12 @@ func TestSMSProjection_reduces(t *testing.T) {
 							},
 						},
 						{
-							expectedStmt: "INSERT INTO projections.sms_configs3_http (sms_id, instance_id, endpoint) VALUES ($1, $2, $3)",
+							expectedStmt: "INSERT INTO projections.sms_configs3_http (sms_id, instance_id, endpoint, signing_key) VALUES ($1, $2, $3, $4)",
 							expectedArgs: []interface{}{
 								"id",
 								"instance-id",
 								"endpoint",
+								anyArg{},
 							},
 						},
 					},
@@ -348,7 +350,8 @@ func TestSMSProjection_reduces(t *testing.T) {
 						[]byte(`{
 						"id": "id",
 						"endpoint": "endpoint",
-						"description": "description"
+						"description": "description",
+						"signingKey": { "cryptoType": 0, "algorithm": "RSA-265", "keyId": "key-id" }
 					}`),
 					), eventstore.GenericEventMapper[instance.SMSConfigHTTPChangedEvent]),
 			},
@@ -369,8 +372,9 @@ func TestSMSProjection_reduces(t *testing.T) {
 							},
 						},
 						{
-							expectedStmt: "UPDATE projections.sms_configs3_http SET endpoint = $1 WHERE (sms_id = $2) AND (instance_id = $3)",
+							expectedStmt: "UPDATE projections.sms_configs3_http SET (signing_key, endpoint) = ($1, $2) WHERE (sms_id = $3) AND (instance_id = $4)",
 							expectedArgs: []interface{}{
+								anyArg{},
 								"endpoint",
 								"id",
 								"instance-id",
@@ -452,6 +456,46 @@ func TestSMSProjection_reduces(t *testing.T) {
 				},
 			},
 		},
+		{
+			name: "instance reduceSMSConfigHTTPChanged, only signing key",
+			args: args{
+				event: getEvent(
+					testEvent(
+						instance.SMSConfigHTTPChangedEventType,
+						instance.AggregateType,
+						[]byte(`{
+						"id": "id",
+						"signingKey": { "cryptoType": 0, "algorithm": "RSA-265", "keyId": "key-id" }
+					}`),
+					), eventstore.GenericEventMapper[instance.SMSConfigHTTPChangedEvent]),
+			},
+			reduce: (&smsConfigProjection{}).reduceSMSConfigHTTPChanged,
+			want: wantReduce{
+				aggregateType: eventstore.AggregateType("instance"),
+				sequence:      15,
+				executer: &testExecuter{
+					executions: []execution{
+						{
+							expectedStmt: "UPDATE projections.sms_configs3 SET (change_date, sequence) = ($1, $2) WHERE (id = $3) AND (instance_id = $4)",
+							expectedArgs: []interface{}{
+								anyArg{},
+								uint64(15),
+								"id",
+								"instance-id",
+							},
+						},
+						{
+							expectedStmt: "UPDATE projections.sms_configs3_http SET signing_key = $1 WHERE (sms_id = $2) AND (instance_id = $3)",
+							expectedArgs: []interface{}{
+								anyArg{},
+								"id",
+								"instance-id",
+							},
+						},
+					},
+				},
+			},
+		},
 		{
 			name: "instance reduceSMSConfigTwilioActivated",
 			args: args{

internal/query/projection/smtp.go

@@ -40,6 +40,7 @@ const (
 	SMTPConfigHTTPColumnInstanceID = "instance_id"
 	SMTPConfigHTTPColumnID         = "id"
 	SMTPConfigHTTPColumnEndpoint   = "endpoint"
+	SMTPConfigHTTPColumnSigningKey = "signing_key"
 )
 
 type smtpConfigProjection struct{}
@@ -86,6 +87,7 @@ func (*smtpConfigProjection) Init() *old_handler.Check {
 			handler.NewColumn(SMTPConfigHTTPColumnID, handler.ColumnTypeText),
 			handler.NewColumn(SMTPConfigHTTPColumnInstanceID, handler.ColumnTypeText),
 			handler.NewColumn(SMTPConfigHTTPColumnEndpoint, handler.ColumnTypeText),
+			handler.NewColumn(SMTPConfigHTTPColumnSigningKey, handler.ColumnTypeJSONB, handler.Nullable()),
 		},
 			handler.NewPrimaryKey(SMTPConfigHTTPColumnInstanceID, SMTPConfigHTTPColumnID),
 			smtpConfigHTTPTableSuffix,
@@ -211,6 +213,7 @@ func (p *smtpConfigProjection) reduceSMTPConfigHTTPAdded(event eventstore.Event)
 				handler.NewCol(SMTPConfigHTTPColumnInstanceID, e.Aggregate().InstanceID),
 				handler.NewCol(SMTPConfigHTTPColumnID, getSMTPConfigID(e.ID, e.Aggregate())),
 				handler.NewCol(SMTPConfigHTTPColumnEndpoint, e.Endpoint),
+				handler.NewCol(SMTPConfigHTTPColumnSigningKey, e.SigningKey),
 			},
 			handler.WithTableSuffix(smtpConfigHTTPTableSuffix),
 		),
@@ -231,20 +234,21 @@ func (p *smtpConfigProjection) reduceSMTPConfigHTTPChanged(event eventstore.Even
 	if e.Description != nil {
 		columns = append(columns, handler.NewCol(SMTPConfigColumnDescription, *e.Description))
 	}
-	if len(columns) > 0 {
-		stmts = append(stmts, handler.AddUpdateStatement(
-			columns,
-			[]handler.Condition{
-				handler.NewCond(SMTPConfigColumnID, getSMTPConfigID(e.ID, e.Aggregate())),
-				handler.NewCond(SMTPConfigColumnInstanceID, e.Aggregate().InstanceID),
-			},
-		))
-	}
+	stmts = append(stmts, handler.AddUpdateStatement(
+		columns,
+		[]handler.Condition{
+			handler.NewCond(SMTPConfigColumnID, getSMTPConfigID(e.ID, e.Aggregate())),
+			handler.NewCond(SMTPConfigColumnInstanceID, e.Aggregate().InstanceID),
+		},
+	))
 
 	smtpColumns := make([]handler.Column, 0, 1)
 	if e.Endpoint != nil {
 		smtpColumns = append(smtpColumns, handler.NewCol(SMTPConfigHTTPColumnEndpoint, *e.Endpoint))
 	}
+	if e.SigningKey != nil {
+		smtpColumns = append(smtpColumns, handler.NewCol(SMTPConfigHTTPColumnSigningKey, e.SigningKey))
+	}
 	if len(smtpColumns) > 0 {
 		stmts = append(stmts, handler.AddUpdateStatement(
 			smtpColumns,

internal/query/projection/smtp_test.go

@@ -225,7 +225,8 @@ func TestSMTPConfigProjection_reduces(t *testing.T) {
 						"aggregate_id": "agg-id",
 						"id": "config-id",		
 						"description": "test",
-						"endpoint": "endpoint"
+						"endpoint": "endpoint",
+						"signingKey": { "cryptoType": 0, "algorithm": "RSA-265", "keyId": "key-id" }
 					}`,
 						),
 					), eventstore.GenericEventMapper[instance.SMTPConfigHTTPChangedEvent]),
@@ -247,9 +248,10 @@ func TestSMTPConfigProjection_reduces(t *testing.T) {
 							},
 						},
 						{
-							expectedStmt: "UPDATE projections.smtp_configs5_http SET endpoint = $1 WHERE (id = $2) AND (instance_id = $3)",
+							expectedStmt: "UPDATE projections.smtp_configs5_http SET (endpoint, signing_key) = ($1, $2) WHERE (id = $3) AND (instance_id = $4)",
 							expectedArgs: []interface{}{
 								"endpoint",
+								anyArg{},
 								"config-id",
 								"instance-id",
 							},
@@ -338,6 +340,49 @@ func TestSMTPConfigProjection_reduces(t *testing.T) {
 					},
 				},
 			},
+		}, {
+			name: "reduceSMTPConfigHTTPChanged, signing key",
+			args: args{
+				event: getEvent(
+					testEvent(
+						instance.SMTPConfigHTTPChangedEventType,
+						instance.AggregateType,
+						[]byte(`{
+						"instance_id": "instance-id",	
+						"resource_owner": "ro-id",	
+						"aggregate_id": "agg-id",
+						"id": "config-id",	
+						"signingKey": { "cryptoType": 0, "algorithm": "RSA-265", "keyId": "key-id" }
+					}`,
+						),
+					), eventstore.GenericEventMapper[instance.SMTPConfigHTTPChangedEvent]),
+			},
+			reduce: (&smtpConfigProjection{}).reduceSMTPConfigHTTPChanged,
+			want: wantReduce{
+				aggregateType: eventstore.AggregateType("instance"),
+				sequence:      15,
+				executer: &testExecuter{
+					executions: []execution{
+						{
+							expectedStmt: "UPDATE projections.smtp_configs5 SET (change_date, sequence) = ($1, $2) WHERE (id = $3) AND (instance_id = $4)",
+							expectedArgs: []interface{}{
+								anyArg{},
+								uint64(15),
+								"config-id",
+								"instance-id",
+							},
+						},
+						{
+							expectedStmt: "UPDATE projections.smtp_configs5_http SET signing_key = $1 WHERE (id = $2) AND (instance_id = $3)",
+							expectedArgs: []interface{}{
+								anyArg{},
+								"config-id",
+								"instance-id",
+							},
+						},
+					},
+				},
+			},
 		},
 		{
 			name: "reduceSMTPConfigAdded (no id)",
@@ -481,7 +526,8 @@ func TestSMTPConfigProjection_reduces(t *testing.T) {
 						"id": "config-id",		
 						"description": "test",
 						"senderAddress": "sender",
-						"endpoint": "endpoint"
+						"endpoint": "endpoint",
+						"signingKey": { "cryptoType": 0, "algorithm": "RSA-265", "keyId": "key-id" }
 					}`),
 					), eventstore.GenericEventMapper[instance.SMTPConfigHTTPAddedEvent]),
 			},
@@ -506,11 +552,12 @@ func TestSMTPConfigProjection_reduces(t *testing.T) {
 							},
 						},
 						{
-							expectedStmt: "INSERT INTO projections.smtp_configs5_http (instance_id, id, endpoint) VALUES ($1, $2, $3)",
+							expectedStmt: "INSERT INTO projections.smtp_configs5_http (instance_id, id, endpoint, signing_key) VALUES ($1, $2, $3, $4)",
 							expectedArgs: []interface{}{
 								"instance-id",
 								"config-id",
 								"endpoint",
+								anyArg{},
 							},
 						},
 					},

internal/query/query.go

@@ -32,6 +32,8 @@ type Queries struct {
 	keyEncryptionAlgorithm    crypto.EncryptionAlgorithm
 	idpConfigEncryption       crypto.EncryptionAlgorithm
 	targetEncryptionAlgorithm crypto.EncryptionAlgorithm
+	smtpEncryptionAlgorithm   crypto.EncryptionAlgorithm
+	smsEncryptionAlgorithm    crypto.EncryptionAlgorithm
 	sessionTokenVerifier      func(ctx context.Context, sessionToken string, sessionID string, tokenID string) (err error)
 	checkPermission           domain.PermissionCheck
 
@@ -53,7 +55,7 @@ func StartQueries(
 	cacheConnectors connector.Connectors,
 	projections projection.Config,
 	defaults sd.SystemDefaults,
-	idpConfigEncryption, otpEncryption, keyEncryptionAlgorithm, certEncryptionAlgorithm, targetEncryptionAlgorithm crypto.EncryptionAlgorithm,
+	idpConfigEncryption, otpEncryption, keyEncryptionAlgorithm, certEncryptionAlgorithm, targetEncryptionAlgorithm, smsEncryptionAlgorithm, smtpEncryptionAlgorithm crypto.EncryptionAlgorithm,
 	zitadelRoles []authz.RoleMapping,
 	sessionTokenVerifier func(ctx context.Context, sessionToken string, sessionID string, tokenID string) (err error),
 	permissionCheck func(q *Queries) domain.PermissionCheck,
@@ -72,6 +74,8 @@ func StartQueries(
 		keyEncryptionAlgorithm:              keyEncryptionAlgorithm,
 		idpConfigEncryption:                 idpConfigEncryption,
 		targetEncryptionAlgorithm:           targetEncryptionAlgorithm,
+		smsEncryptionAlgorithm:              smsEncryptionAlgorithm,
+		smtpEncryptionAlgorithm:             smtpEncryptionAlgorithm,
 		sessionTokenVerifier:                sessionTokenVerifier,
 		multifactors: domain.MultifactorConfigs{
 			OTP: domain.OTPConfig{

internal/query/sms.go

@@ -35,6 +35,13 @@ type SMSConfig struct {
 	HTTPConfig   *HTTP
 }
 
+func (h *SMSConfig) decryptSigningKey(alg crypto.EncryptionAlgorithm) error {
+	if h.HTTPConfig == nil {
+		return nil
+	}
+	return h.HTTPConfig.decryptSigningKey(alg)
+}
+
 type Twilio struct {
 	SID              string
 	Token            *crypto.CryptoValue
@@ -43,7 +50,21 @@ type Twilio struct {
 }
 
 type HTTP struct {
-	Endpoint string
+	Endpoint   string
+	signingKey *crypto.CryptoValue
+	SigningKey string
+}
+
+func (h *HTTP) decryptSigningKey(alg crypto.EncryptionAlgorithm) error {
+	if h.signingKey == nil {
+		return nil
+	}
+	keyValue, err := crypto.DecryptString(h.signingKey, alg)
+	if err != nil {
+		return zerrors.ThrowInternal(err, "QUERY-bxovy3YXwy", "Errors.Internal")
+	}
+	h.SigningKey = keyValue
+	return nil
 }
 
 type SMSConfigsSearchQueries struct {
@@ -142,6 +163,10 @@ var (
 		name:  projection.SMSHTTPColumnEndpoint,
 		table: smsHTTPTable,
 	}
+	SMSHTTPColumnSigningKey = Column{
+		name:  projection.SMSHTTPColumnSigningKey,
+		table: smsHTTPTable,
+	}
 )
 
 func (q *Queries) SMSProviderConfigByID(ctx context.Context, id string) (config *SMSConfig, err error) {
@@ -163,7 +188,13 @@ func (q *Queries) SMSProviderConfigByID(ctx context.Context, id string) (config
 		config, err = scan(row)
 		return err
 	}, stmt, args...)
-	return config, err
+	if err != nil {
+		return nil, err
+	}
+	if err := config.decryptSigningKey(q.smsEncryptionAlgorithm); err != nil {
+		return nil, err
+	}
+	return config, nil
 }
 
 func (q *Queries) SMSProviderConfigActive(ctx context.Context, instanceID string) (config *SMSConfig, err error) {
@@ -185,7 +216,13 @@ func (q *Queries) SMSProviderConfigActive(ctx context.Context, instanceID string
 		config, err = scan(row)
 		return err
 	}, stmt, args...)
-	return config, err
+	if err != nil {
+		return nil, err
+	}
+	if err := config.decryptSigningKey(q.smsEncryptionAlgorithm); err != nil {
+		return nil, err
+	}
+	return config, nil
 }
 
 func (q *Queries) SearchSMSConfigs(ctx context.Context, queries *SMSConfigsSearchQueries) (configs *SMSConfigs, err error) {
@@ -208,8 +245,13 @@ func (q *Queries) SearchSMSConfigs(ctx context.Context, queries *SMSConfigsSearc
 	if err != nil {
 		return nil, zerrors.ThrowInternal(err, "QUERY-l4bxm", "Errors.Internal")
 	}
+	for i := range configs.Configs {
+		if err := configs.Configs[i].decryptSigningKey(q.smsEncryptionAlgorithm); err != nil {
+			return nil, err
+		}
+	}
 	configs.State, err = q.latestState(ctx, smsConfigsTable)
-	return configs, err
+	return configs, nil
 }
 
 func NewSMSProviderStateQuery(state domain.SMSConfigState) (SearchQuery, error) {
@@ -235,6 +277,7 @@ func prepareSMSConfigQuery() (sq.SelectBuilder, func(*sql.Row) (*SMSConfig, erro
 
 			SMSHTTPColumnSMSID.identifier(),
 			SMSHTTPColumnEndpoint.identifier(),
+			SMSHTTPColumnSigningKey.identifier(),
 		).From(smsConfigsTable.identifier()).
 			LeftJoin(join(SMSTwilioColumnSMSID, SMSColumnID)).
 			LeftJoin(join(SMSHTTPColumnSMSID, SMSColumnID)).
@@ -264,6 +307,7 @@ func prepareSMSConfigQuery() (sq.SelectBuilder, func(*sql.Row) (*SMSConfig, erro
 
 				&httpConfig.id,
 				&httpConfig.endpoint,
+				&httpConfig.signingKey,
 			)
 
 			if err != nil {
@@ -299,6 +343,7 @@ func prepareSMSConfigsQuery() (sq.SelectBuilder, func(*sql.Rows) (*SMSConfigs, e
 
 			SMSHTTPColumnSMSID.identifier(),
 			SMSHTTPColumnEndpoint.identifier(),
+			SMSHTTPColumnSigningKey.identifier(),
 
 			countColumn.identifier(),
 		).From(smsConfigsTable.identifier()).
@@ -332,6 +377,7 @@ func prepareSMSConfigsQuery() (sq.SelectBuilder, func(*sql.Rows) (*SMSConfigs, e
 
 					&httpConfig.id,
 					&httpConfig.endpoint,
+					&httpConfig.signingKey,
 
 					&configs.Count,
 				)
@@ -371,8 +417,9 @@ func (c sqlTwilioConfig) set(smsConfig *SMSConfig) {
 }
 
 type sqlHTTPConfig struct {
-	id       sql.NullString
-	endpoint sql.NullString
+	id         sql.NullString
+	endpoint   sql.NullString
+	signingKey *crypto.CryptoValue
 }
 
 func (c sqlHTTPConfig) setSMS(smsConfig *SMSConfig) {
@@ -380,6 +427,7 @@ func (c sqlHTTPConfig) setSMS(smsConfig *SMSConfig) {
 		return
 	}
 	smsConfig.HTTPConfig = &HTTP{
-		Endpoint: c.endpoint.String,
+		Endpoint:   c.endpoint.String,
+		signingKey: c.signingKey,
 	}
 }

internal/query/sms_test.go

@@ -32,7 +32,8 @@ var (
 
 		// http config
 		` projections.sms_configs3_http.sms_id,` +
-		` projections.sms_configs3_http.endpoint` +
+		` projections.sms_configs3_http.endpoint,` +
+		` projections.sms_configs3_http.signing_key` +
 		` FROM projections.sms_configs3` +
 		` LEFT JOIN projections.sms_configs3_twilio ON projections.sms_configs3.id = projections.sms_configs3_twilio.sms_id AND projections.sms_configs3.instance_id = projections.sms_configs3_twilio.instance_id` +
 		` LEFT JOIN projections.sms_configs3_http ON projections.sms_configs3.id = projections.sms_configs3_http.sms_id AND projections.sms_configs3.instance_id = projections.sms_configs3_http.instance_id`)
@@ -55,6 +56,7 @@ var (
 		// http config
 		` projections.sms_configs3_http.sms_id,` +
 		` projections.sms_configs3_http.endpoint,` +
+		` projections.sms_configs3_http.signing_key,` +
 		` COUNT(*) OVER ()` +
 		` FROM projections.sms_configs3` +
 		` LEFT JOIN projections.sms_configs3_twilio ON projections.sms_configs3.id = projections.sms_configs3_twilio.sms_id AND projections.sms_configs3.instance_id = projections.sms_configs3_twilio.instance_id` +
@@ -78,6 +80,7 @@ var (
 		// http config
 		"sms_id",
 		"endpoint",
+		"signing_key",
 	}
 	smsConfigsCols = append(smsConfigCols, "count")
 )
@@ -131,6 +134,7 @@ func Test_SMSConfigsPrepare(t *testing.T) {
 							// http config
 							nil,
 							nil,
+							nil,
 						},
 					},
 				),
@@ -185,6 +189,12 @@ func Test_SMSConfigsPrepare(t *testing.T) {
 							// http config
 							"sms-id",
 							"endpoint",
+							&crypto.CryptoValue{
+								CryptoType: crypto.TypeEncryption,
+								Algorithm:  "alg",
+								KeyID:      "encKey",
+								Crypted:    []byte("crypted"),
+							},
 						},
 					},
 				),
@@ -205,6 +215,12 @@ func Test_SMSConfigsPrepare(t *testing.T) {
 						Description:   "description",
 						HTTPConfig: &HTTP{
 							Endpoint: "endpoint",
+							signingKey: &crypto.CryptoValue{
+								CryptoType: crypto.TypeEncryption,
+								Algorithm:  "alg",
+								KeyID:      "encKey",
+								Crypted:    []byte("crypted"),
+							},
 						},
 					},
 				},
@@ -236,6 +252,7 @@ func Test_SMSConfigsPrepare(t *testing.T) {
 							// http config
 							nil,
 							nil,
+							nil,
 						},
 						{
 							"sms-id2",
@@ -255,6 +272,7 @@ func Test_SMSConfigsPrepare(t *testing.T) {
 							// http config
 							nil,
 							nil,
+							nil,
 						},
 						{
 							"sms-id3",
@@ -274,6 +292,12 @@ func Test_SMSConfigsPrepare(t *testing.T) {
 							// http config
 							"sms-id3",
 							"endpoint3",
+							&crypto.CryptoValue{
+								CryptoType: crypto.TypeEncryption,
+								Algorithm:  "alg",
+								KeyID:      "encKey",
+								Crypted:    []byte("crypted"),
+							},
 						},
 					},
 				),
@@ -326,6 +350,12 @@ func Test_SMSConfigsPrepare(t *testing.T) {
 						Description:   "description",
 						HTTPConfig: &HTTP{
 							Endpoint: "endpoint3",
+							signingKey: &crypto.CryptoValue{
+								CryptoType: crypto.TypeEncryption,
+								Algorithm:  "alg",
+								KeyID:      "encKey",
+								Crypted:    []byte("crypted"),
+							},
 						},
 					},
 				},
@@ -410,6 +440,7 @@ func Test_SMSConfigPrepare(t *testing.T) {
 						// http config
 						nil,
 						nil,
+						nil,
 					},
 				),
 			},
@@ -455,6 +486,12 @@ func Test_SMSConfigPrepare(t *testing.T) {
 						// http config
 						"sms-id",
 						"endpoint",
+						&crypto.CryptoValue{
+							CryptoType: crypto.TypeEncryption,
+							Algorithm:  "alg",
+							KeyID:      "encKey",
+							Crypted:    []byte("crypted"),
+						},
 					},
 				),
 			},
@@ -469,6 +506,12 @@ func Test_SMSConfigPrepare(t *testing.T) {
 				Description:   "description",
 				HTTPConfig: &HTTP{
 					Endpoint: "endpoint",
+					signingKey: &crypto.CryptoValue{
+						CryptoType: crypto.TypeEncryption,
+						Algorithm:  "alg",
+						KeyID:      "encKey",
+						Crypted:    []byte("crypted"),
+					},
 				},
 			},
 		},

internal/query/smtp.go

@@ -121,6 +121,10 @@ var (
 		name:  projection.SMTPConfigHTTPColumnEndpoint,
 		table: smtpConfigsHTTPTable,
 	}
+	SMTPConfigHTTPColumnSigningKey = Column{
+		name:  projection.SMTPConfigHTTPColumnSigningKey,
+		table: smtpConfigsHTTPTable,
+	}
 )
 
 type SMTPConfig struct {
@@ -138,6 +142,13 @@ type SMTPConfig struct {
 	State domain.SMTPConfigState
 }
 
+func (h *SMTPConfig) decryptSigningKey(alg crypto.EncryptionAlgorithm) error {
+	if h.HTTPConfig == nil {
+		return nil
+	}
+	return h.HTTPConfig.decryptSigningKey(alg)
+}
+
 type SMTP struct {
 	TLS            bool
 	SenderAddress  string
@@ -166,7 +177,13 @@ func (q *Queries) SMTPConfigActive(ctx context.Context, resourceOwner string) (c
 		config, err = scan(row)
 		return err
 	}, query, args...)
-	return config, err
+	if err != nil {
+		return nil, err
+	}
+	if err := config.decryptSigningKey(q.smtpEncryptionAlgorithm); err != nil {
+		return nil, err
+	}
+	return config, nil
 }
 
 func (q *Queries) SMTPConfigByID(ctx context.Context, instanceID, id string) (config *SMTPConfig, err error) {
@@ -186,12 +203,16 @@ func (q *Queries) SMTPConfigByID(ctx context.Context, instanceID, id string) (co
 		config, err = scan(row)
 		return err
 	}, query, args...)
+	if err != nil {
+		return nil, err
+	}
+	if err := config.decryptSigningKey(q.smtpEncryptionAlgorithm); err != nil {
+		return nil, err
+	}
 	return config, err
 }
 
 func prepareSMTPConfigQuery() (sq.SelectBuilder, func(*sql.Row) (*SMTPConfig, error)) {
-	password := new(crypto.CryptoValue)
-
 	return sq.Select(
 			SMTPConfigColumnCreationDate.identifier(),
 			SMTPConfigColumnChangeDate.identifier(),
@@ -211,7 +232,9 @@ func prepareSMTPConfigQuery() (sq.SelectBuilder, func(*sql.Row) (*SMTPConfig, er
 			SMTPConfigSMTPColumnPassword.identifier(),
 
 			SMTPConfigHTTPColumnID.identifier(),
-			SMTPConfigHTTPColumnEndpoint.identifier()).
+			SMTPConfigHTTPColumnEndpoint.identifier(),
+			SMTPConfigHTTPColumnSigningKey.identifier(),
+		).
 			From(smtpConfigsTable.identifier()).
 			LeftJoin(join(SMTPConfigSMTPColumnID, SMTPConfigColumnID)).
 			LeftJoin(join(SMTPConfigHTTPColumnID, SMTPConfigColumnID)).
@@ -237,9 +260,10 @@ func prepareSMTPConfigQuery() (sq.SelectBuilder, func(*sql.Row) (*SMTPConfig, er
 				&smtpConfig.replyToAddress,
 				&smtpConfig.host,
 				&smtpConfig.user,
-				&password,
+				&smtpConfig.password,
 				&httpConfig.id,
 				&httpConfig.endpoint,
+				&httpConfig.signingKey,
 			)
 			if err != nil {
 				if errors.Is(err, sql.ErrNoRows) {
@@ -247,9 +271,10 @@ func prepareSMTPConfigQuery() (sq.SelectBuilder, func(*sql.Row) (*SMTPConfig, er
 				}
 				return nil, zerrors.ThrowInternal(err, "QUERY-9k87F", "Errors.Internal")
 			}
-			smtpConfig.password = password
+
 			smtpConfig.set(config)
 			httpConfig.setSMTP(config)
+
 			return config, nil
 		}
 }
@@ -275,6 +300,8 @@ func prepareSMTPConfigsQuery() (sq.SelectBuilder, func(*sql.Rows) (*SMTPConfigs,
 
 			SMTPConfigHTTPColumnID.identifier(),
 			SMTPConfigHTTPColumnEndpoint.identifier(),
+			SMTPConfigHTTPColumnSigningKey.identifier(),
+
 			countColumn.identifier(),
 		).From(smtpConfigsTable.identifier()).
 			LeftJoin(join(SMTPConfigSMTPColumnID, SMTPConfigColumnID)).
@@ -284,7 +311,6 @@ func prepareSMTPConfigsQuery() (sq.SelectBuilder, func(*sql.Rows) (*SMTPConfigs,
 			configs := &SMTPConfigs{Configs: []*SMTPConfig{}}
 			for rows.Next() {
 				config := new(SMTPConfig)
-				password := new(crypto.CryptoValue)
 				var (
 					smtpConfig = sqlSmtpConfig{}
 					httpConfig = sqlHTTPConfig{}
@@ -304,20 +330,19 @@ func prepareSMTPConfigsQuery() (sq.SelectBuilder, func(*sql.Rows) (*SMTPConfigs,
 					&smtpConfig.replyToAddress,
 					&smtpConfig.host,
 					&smtpConfig.user,
-					&password,
+					&smtpConfig.password,
 					&httpConfig.id,
 					&httpConfig.endpoint,
+					&httpConfig.signingKey,
 					&configs.Count,
 				)
 				if err != nil {
-					if errors.Is(err, sql.ErrNoRows) {
-						return nil, zerrors.ThrowNotFound(err, "QUERY-fwofw", "Errors.SMTPConfig.NotFound")
-					}
 					return nil, zerrors.ThrowInternal(err, "QUERY-9k87F", "Errors.Internal")
 				}
-				smtpConfig.password = password
+
 				smtpConfig.set(config)
 				httpConfig.setSMTP(config)
+
 				configs.Configs = append(configs.Configs, config)
 			}
 			return configs, nil
@@ -344,6 +369,11 @@ func (q *Queries) SearchSMTPConfigs(ctx context.Context, queries *SMTPConfigsSea
 	if err != nil {
 		return nil, zerrors.ThrowInternal(err, "QUERY-tOpKN", "Errors.Internal")
 	}
+	for i := range configs.Configs {
+		if err := configs.Configs[i].decryptSigningKey(q.smtpEncryptionAlgorithm); err != nil {
+			return nil, err
+		}
+	}
 	configs.State, err = q.latestState(ctx, smsConfigsTable)
 	return configs, err
 }
@@ -379,6 +409,7 @@ func (c sqlHTTPConfig) setSMTP(smtpConfig *SMTPConfig) {
 		return
 	}
 	smtpConfig.HTTPConfig = &HTTP{
-		Endpoint: c.endpoint.String,
+		Endpoint:   c.endpoint.String,
+		signingKey: c.signingKey,
 	}
 }

internal/query/smtp_test.go

@@ -30,10 +30,34 @@ var (
 		` projections.smtp_configs5_smtp.username,` +
 		` projections.smtp_configs5_smtp.password,` +
 		` projections.smtp_configs5_http.id,` +
-		` projections.smtp_configs5_http.endpoint` +
+		` projections.smtp_configs5_http.endpoint,` +
+		` projections.smtp_configs5_http.signing_key` +
 		` FROM projections.smtp_configs5` +
 		` LEFT JOIN projections.smtp_configs5_smtp ON projections.smtp_configs5.id = projections.smtp_configs5_smtp.id AND projections.smtp_configs5.instance_id = projections.smtp_configs5_smtp.instance_id` +
 		` LEFT JOIN projections.smtp_configs5_http ON projections.smtp_configs5.id = projections.smtp_configs5_http.id AND projections.smtp_configs5.instance_id = projections.smtp_configs5_http.instance_id`
+	prepareSMTPConfigsStmt = `SELECT projections.smtp_configs5.creation_date,` +
+		` projections.smtp_configs5.change_date,` +
+		` projections.smtp_configs5.resource_owner,` +
+		` projections.smtp_configs5.sequence,` +
+		` projections.smtp_configs5.id,` +
+		` projections.smtp_configs5.state,` +
+		` projections.smtp_configs5.description,` +
+		` projections.smtp_configs5_smtp.id,` +
+		` projections.smtp_configs5_smtp.tls,` +
+		` projections.smtp_configs5_smtp.sender_address,` +
+		` projections.smtp_configs5_smtp.sender_name,` +
+		` projections.smtp_configs5_smtp.reply_to_address,` +
+		` projections.smtp_configs5_smtp.host,` +
+		` projections.smtp_configs5_smtp.username,` +
+		` projections.smtp_configs5_smtp.password,` +
+		` projections.smtp_configs5_http.id,` +
+		` projections.smtp_configs5_http.endpoint,` +
+		` projections.smtp_configs5_http.signing_key,` +
+		` COUNT(*) OVER ()` +
+		` FROM projections.smtp_configs5` +
+		` LEFT JOIN projections.smtp_configs5_smtp ON projections.smtp_configs5.id = projections.smtp_configs5_smtp.id AND projections.smtp_configs5.instance_id = projections.smtp_configs5_smtp.instance_id` +
+		` LEFT JOIN projections.smtp_configs5_http ON projections.smtp_configs5.id = projections.smtp_configs5_http.id AND projections.smtp_configs5.instance_id = projections.smtp_configs5_http.instance_id`
+
 	prepareSMTPConfigCols = []string{
 		"creation_date",
 		"change_date",
@@ -52,10 +76,12 @@ var (
 		"smtp_password",
 		"id",
 		"endpoint",
+		"signing_key",
 	}
+	prepareSMTPConfigsCols = append(prepareSMTPConfigCols, "count")
 )
 
-func Test_SMTPConfigsPrepares(t *testing.T) {
+func Test_SMTPConfigPrepares(t *testing.T) {
 	type want struct {
 		sqlExpectations sqlExpectation
 		err             checkErr
@@ -109,6 +135,7 @@ func Test_SMTPConfigsPrepares(t *testing.T) {
 						&crypto.CryptoValue{},
 						nil,
 						nil,
+						nil,
 					},
 				),
 			},
@@ -156,6 +183,12 @@ func Test_SMTPConfigsPrepares(t *testing.T) {
 						nil,
 						"2232323",
 						"endpoint",
+						&crypto.CryptoValue{
+							CryptoType: crypto.TypeEncryption,
+							Algorithm:  "alg",
+							KeyID:      "encKey",
+							Crypted:    []byte("crypted"),
+						},
 					},
 				),
 			},
@@ -166,6 +199,12 @@ func Test_SMTPConfigsPrepares(t *testing.T) {
 				Sequence:      20211108,
 				HTTPConfig: &HTTP{
 					Endpoint: "endpoint",
+					signingKey: &crypto.CryptoValue{
+						CryptoType: crypto.TypeEncryption,
+						Algorithm:  "alg",
+						KeyID:      "encKey",
+						Crypted:    []byte("crypted"),
+					},
 				},
 				ID:          "2232323",
 				State:       domain.SMTPConfigStateActive,
@@ -197,6 +236,7 @@ func Test_SMTPConfigsPrepares(t *testing.T) {
 						&crypto.CryptoValue{},
 						nil,
 						nil,
+						nil,
 					},
 				),
 			},
@@ -244,6 +284,7 @@ func Test_SMTPConfigsPrepares(t *testing.T) {
 						&crypto.CryptoValue{},
 						nil,
 						nil,
+						nil,
 					},
 				),
 			},
@@ -290,3 +331,247 @@ func Test_SMTPConfigsPrepares(t *testing.T) {
 		})
 	}
 }
+
+func Test_SMTPConfigsPrepares(t *testing.T) {
+	type want struct {
+		sqlExpectations sqlExpectation
+		err             checkErr
+	}
+	tests := []struct {
+		name    string
+		prepare interface{}
+		want    want
+		object  interface{}
+	}{
+
+		{
+			name:    "prepareSMTPConfigsQuery no result",
+			prepare: prepareSMTPConfigsQuery,
+			want: want{
+				sqlExpectations: mockQueries(
+					regexp.QuoteMeta(prepareSMTPConfigsStmt),
+					nil,
+					nil,
+				),
+			},
+			object: &SMTPConfigs{Configs: []*SMTPConfig{}},
+		},
+		{
+			name:    "prepareSMTPConfigsQuery found",
+			prepare: prepareSMTPConfigsQuery,
+			want: want{
+				sqlExpectations: mockQueries(
+					regexp.QuoteMeta(prepareSMTPConfigsStmt),
+					prepareSMTPConfigsCols,
+					[][]driver.Value{
+						{
+							testNow,
+							testNow,
+							"ro",
+							uint64(20211108),
+							"2232323",
+							domain.SMTPConfigStateActive,
+							"test",
+							"2232323",
+							true,
+							"sender",
+							"name",
+							"reply-to",
+							"host",
+							"user",
+							&crypto.CryptoValue{},
+							nil,
+							nil,
+							nil,
+						},
+					},
+				),
+			},
+			object: &SMTPConfigs{
+				SearchResponse: SearchResponse{
+					Count: 1,
+				},
+				Configs: []*SMTPConfig{
+					{
+						CreationDate:  testNow,
+						ChangeDate:    testNow,
+						ResourceOwner: "ro",
+						Sequence:      20211108,
+						SMTPConfig: &SMTP{
+							TLS:            true,
+							SenderAddress:  "sender",
+							SenderName:     "name",
+							ReplyToAddress: "reply-to",
+							Host:           "host",
+							User:           "user",
+							Password:       &crypto.CryptoValue{},
+						},
+						ID:          "2232323",
+						State:       domain.SMTPConfigStateActive,
+						Description: "test",
+					},
+				},
+			},
+		},
+		{
+			name:    "prepareSMTPConfigsQuery found, multi",
+			prepare: prepareSMTPConfigsQuery,
+			want: want{
+				sqlExpectations: mockQueries(
+					regexp.QuoteMeta(prepareSMTPConfigsStmt),
+					prepareSMTPConfigsCols,
+					[][]driver.Value{
+						{
+							testNow,
+							testNow,
+							"ro",
+							uint64(20211108),
+							"2232323",
+							domain.SMTPConfigStateActive,
+							"test",
+							nil,
+							nil,
+							nil,
+							nil,
+							nil,
+							nil,
+							nil,
+							nil,
+							"2232323",
+							"endpoint",
+							&crypto.CryptoValue{
+								CryptoType: crypto.TypeEncryption,
+								Algorithm:  "alg",
+								KeyID:      "encKey",
+								Crypted:    []byte("crypted"),
+							},
+						},
+						{
+							testNow,
+							testNow,
+							"ro",
+							uint64(20211109),
+							"44442323",
+							domain.SMTPConfigStateInactive,
+							"test2",
+							"44442323",
+							true,
+							"sender2",
+							"name2",
+							"reply-to2",
+							"host2",
+							"user2",
+							&crypto.CryptoValue{},
+							nil,
+							nil,
+							nil,
+						},
+						{
+							testNow,
+							testNow,
+							"ro",
+							uint64(20211109),
+							"23234444",
+							domain.SMTPConfigStateInactive,
+							"test3",
+							"23234444",
+							true,
+							"sender3",
+							"name3",
+							"reply-to3",
+							"host3",
+							"user3",
+							&crypto.CryptoValue{},
+							nil,
+							nil,
+							nil,
+						},
+					},
+				),
+			},
+			object: &SMTPConfigs{
+				SearchResponse: SearchResponse{
+					Count: 3,
+				},
+				Configs: []*SMTPConfig{
+					{
+						CreationDate:  testNow,
+						ChangeDate:    testNow,
+						ResourceOwner: "ro",
+						Sequence:      20211108,
+						HTTPConfig: &HTTP{
+							Endpoint: "endpoint",
+							signingKey: &crypto.CryptoValue{
+								CryptoType: crypto.TypeEncryption,
+								Algorithm:  "alg",
+								KeyID:      "encKey",
+								Crypted:    []byte("crypted"),
+							},
+						},
+						ID:          "2232323",
+						State:       domain.SMTPConfigStateActive,
+						Description: "test",
+					},
+					{
+						CreationDate:  testNow,
+						ChangeDate:    testNow,
+						ResourceOwner: "ro",
+						Sequence:      20211109,
+						SMTPConfig: &SMTP{
+							TLS:            true,
+							SenderAddress:  "sender2",
+							SenderName:     "name2",
+							ReplyToAddress: "reply-to2",
+							Host:           "host2",
+							User:           "user2",
+							Password:       &crypto.CryptoValue{},
+						},
+						ID:          "44442323",
+						State:       domain.SMTPConfigStateInactive,
+						Description: "test2",
+					},
+					{
+						CreationDate:  testNow,
+						ChangeDate:    testNow,
+						ResourceOwner: "ro",
+						Sequence:      20211109,
+						SMTPConfig: &SMTP{
+							TLS:            true,
+							SenderAddress:  "sender3",
+							SenderName:     "name3",
+							ReplyToAddress: "reply-to3",
+							Host:           "host3",
+							User:           "user3",
+							Password:       &crypto.CryptoValue{},
+						},
+						ID:          "23234444",
+						State:       domain.SMTPConfigStateInactive,
+						Description: "test3",
+					},
+				},
+			},
+		},
+		{
+			name:    "prepareSMTPConfigsQuery sql err",
+			prepare: prepareSMTPConfigsQuery,
+			want: want{
+				sqlExpectations: mockQueryErr(
+					regexp.QuoteMeta(prepareSMTPConfigsStmt),
+					sql.ErrConnDone,
+				),
+				err: func(err error) (error, bool) {
+					if !errors.Is(err, sql.ErrConnDone) {
+						return fmt.Errorf("err should be sql.ErrConnDone got: %w", err), false
+					}
+					return nil, true
+				},
+			},
+			object: (*SMTPConfigs)(nil),
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			assertPrepare(t, tt.prepare, tt.object, tt.want.sqlExpectations, tt.want.err)
+		})
+	}
+}

internal/repository/instance/sms.go

@@ -183,9 +183,10 @@ func (e *SMSConfigTwilioTokenChangedEvent) UniqueConstraints() []*eventstore.Uni
 type SMSConfigHTTPAddedEvent struct {
 	*eventstore.BaseEvent `json:"-"`
 
-	ID          string `json:"id,omitempty"`
-	Description string `json:"description,omitempty"`
-	Endpoint    string `json:"endpoint,omitempty"`
+	ID          string              `json:"id,omitempty"`
+	Description string              `json:"description,omitempty"`
+	Endpoint    string              `json:"endpoint,omitempty"`
+	SigningKey  *crypto.CryptoValue `json:"signingKey"`
 }
 
 func NewSMSConfigHTTPAddedEvent(
@@ -194,6 +195,7 @@ func NewSMSConfigHTTPAddedEvent(
 	id,
 	description,
 	endpoint string,
+	signingKey *crypto.CryptoValue,
 ) *SMSConfigHTTPAddedEvent {
 	return &SMSConfigHTTPAddedEvent{
 		BaseEvent: eventstore.NewBaseEventForPush(
@@ -204,6 +206,7 @@ func NewSMSConfigHTTPAddedEvent(
 		ID:          id,
 		Description: description,
 		Endpoint:    endpoint,
+		SigningKey:  signingKey,
 	}
 }
 
@@ -222,9 +225,10 @@ func (e *SMSConfigHTTPAddedEvent) UniqueConstraints() []*eventstore.UniqueConstr
 type SMSConfigHTTPChangedEvent struct {
 	*eventstore.BaseEvent `json:"-"`
 
-	ID          string  `json:"id,omitempty"`
-	Description *string `json:"description,omitempty"`
-	Endpoint    *string `json:"endpoint,omitempty"`
+	ID          string              `json:"id,omitempty"`
+	Description *string             `json:"description,omitempty"`
+	Endpoint    *string             `json:"endpoint,omitempty"`
+	SigningKey  *crypto.CryptoValue `json:"signingKey,omitempty"`
 }
 
 func NewSMSConfigHTTPChangedEvent(
@@ -262,6 +266,11 @@ func ChangeSMSConfigHTTPEndpoint(endpoint string) func(event *SMSConfigHTTPChang
 		e.Endpoint = &endpoint
 	}
 }
+func ChangeSMSConfigHTTPSigningKey(signingKey *crypto.CryptoValue) func(event *SMSConfigHTTPChangedEvent) {
+	return func(e *SMSConfigHTTPChangedEvent) {
+		e.SigningKey = signingKey
+	}
+}
 
 func (e *SMSConfigHTTPChangedEvent) SetBaseEvent(event *eventstore.BaseEvent) {
 	e.BaseEvent = event

internal/repository/instance/smtp_config.go

@@ -217,9 +217,10 @@ func (e *SMTPConfigPasswordChangedEvent) UniqueConstraints() []*eventstore.Uniqu
 type SMTPConfigHTTPAddedEvent struct {
 	*eventstore.BaseEvent `json:"-"`
 
-	ID          string `json:"id,omitempty"`
-	Description string `json:"description,omitempty"`
-	Endpoint    string `json:"endpoint,omitempty"`
+	ID          string              `json:"id,omitempty"`
+	Description string              `json:"description,omitempty"`
+	Endpoint    string              `json:"endpoint,omitempty"`
+	SigningKey  *crypto.CryptoValue `json:"signingKey"`
 }
 
 func NewSMTPConfigHTTPAddedEvent(
@@ -227,6 +228,7 @@ func NewSMTPConfigHTTPAddedEvent(
 	aggregate *eventstore.Aggregate,
 	id, description string,
 	endpoint string,
+	signingKey *crypto.CryptoValue,
 ) *SMTPConfigHTTPAddedEvent {
 	return &SMTPConfigHTTPAddedEvent{
 		BaseEvent: eventstore.NewBaseEventForPush(
@@ -237,6 +239,7 @@ func NewSMTPConfigHTTPAddedEvent(
 		ID:          id,
 		Description: description,
 		Endpoint:    endpoint,
+		SigningKey:  signingKey,
 	}
 }
 
@@ -254,9 +257,10 @@ func (e *SMTPConfigHTTPAddedEvent) UniqueConstraints() []*eventstore.UniqueConst
 
 type SMTPConfigHTTPChangedEvent struct {
 	*eventstore.BaseEvent `json:"-"`
-	ID                    string  `json:"id,omitempty"`
-	Description           *string `json:"description,omitempty"`
-	Endpoint              *string `json:"endpoint,omitempty"`
+	ID                    string              `json:"id,omitempty"`
+	Description           *string             `json:"description,omitempty"`
+	Endpoint              *string             `json:"endpoint,omitempty"`
+	SigningKey            *crypto.CryptoValue `json:"signingKey,omitempty"`
 }
 
 func (e *SMTPConfigHTTPChangedEvent) SetBaseEvent(event *eventstore.BaseEvent) {
@@ -314,6 +318,12 @@ func ChangeSMTPConfigHTTPEndpoint(endpoint string) func(event *SMTPConfigHTTPCha
 	}
 }
 
+func ChangeSMTPConfigHTTPSigningKey(signingKey *crypto.CryptoValue) func(event *SMTPConfigHTTPChangedEvent) {
+	return func(e *SMTPConfigHTTPChangedEvent) {
+		e.SigningKey = signingKey
+	}
+}
+
 type SMTPConfigActivatedEvent struct {
 	*eventstore.BaseEvent `json:"-"`
 	ID                    string `json:"id,omitempty"`

proto/zitadel/admin.proto

@@ -5069,6 +5069,12 @@ message AddEmailProviderHTTPRequest {
 message AddEmailProviderHTTPResponse {
     zitadel.v1.ObjectDetails details = 1;
     string id = 2;
+    // Key used to sign and check payload sent to the HTTP provider.
+    string signing_key = 3 [
+        (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_field) = {
+            example: "\"98KmsU67\""
+        }
+    ];
 }
 
 message UpdateEmailProviderHTTPRequest {
@@ -5090,10 +5096,31 @@ message UpdateEmailProviderHTTPRequest {
             max_length: 200;
         }
     ];
+    // Regenerate the key used for signing and checking the payload sent to the HTTP provider.
+    // Set the graceful period for the existing key. During that time, the previous
+    // signing key and the new one will be used to sign the request to allow you a smooth
+    // transition onf your API.
+    //
+    // Note that we currently only allow an immediate rotation ("0s") and will support
+    // longer expirations in the future.
+    optional google.protobuf.Duration expiration_signing_key = 4 [
+        (validate.rules).duration = {const: {seconds: 0, nanos: 0}},
+        (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_field) = {
+            example: "\"0s\""
+            minimum: 0
+            maximum: 0
+        }
+    ];
 }
 
 message UpdateEmailProviderHTTPResponse {
     zitadel.v1.ObjectDetails details = 1;
+    // Key used to sign and check payload sent to the HTTP provider.
+    optional string signing_key = 2 [
+        (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_field) = {
+            example: "\"98KmsU67\""
+        }
+    ];
 }
 
 message ActivateEmailProviderRequest {
@@ -5336,6 +5363,12 @@ message AddSMSProviderHTTPRequest {
 message AddSMSProviderHTTPResponse {
     zitadel.v1.ObjectDetails details = 1;
     string id = 2;
+    // Key used to sign and check payload sent to the HTTP provider.
+    string signing_key = 3 [
+        (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_field) = {
+            example: "\"98KmsU67\""
+        }
+    ];
 }
 
 message UpdateSMSProviderHTTPRequest {
@@ -5357,10 +5390,30 @@ message UpdateSMSProviderHTTPRequest {
             max_length: 200;
         }
     ];
+    // Regenerate the key used for signing and checking the payload sent to the HTTP provider.
+    // Set the graceful period for the existing key. During that time, the previous
+    // signing key and the new one will be used to sign the request to allow you a smooth
+    // transition onf your API.
+    //
+    // Note that we currently only allow an immediate rotation ("0s") and will support
+    // longer expirations in the future.
+    optional google.protobuf.Duration expiration_signing_key = 4 [
+        (validate.rules).duration = {const: {seconds: 0, nanos: 0}},
+        (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_field) = {
+            example: "\"0s\""
+            minimum: 0
+            maximum: 0
+        }
+    ];
 }
 
 message UpdateSMSProviderHTTPResponse {
-    zitadel.v1.ObjectDetails details = 1;
+    zitadel.v1.ObjectDetails details = 1;// Key used to sign and check payload sent to the HTTP provider.
+    optional string signing_key = 2 [
+        (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_field) = {
+            example: "\"98KmsU67\""
+        }
+    ];
 }
 
 message ActivateSMSProviderRequest {

proto/zitadel/settings.proto

@@ -144,6 +144,11 @@ message EmailProviderSMTP {
 
 message EmailProviderHTTP {
   string endpoint = 1;
+  string signing_key = 2 [
+    (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_field) = {
+      example: "\"98KmsU67\""
+    }
+  ];
 }
 
 message SMSProvider {
@@ -166,6 +171,11 @@ message TwilioConfig {
 
 message HTTPConfig {
   string endpoint = 1;
+  string signing_key = 2 [
+    (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_field) = {
+      example: "\"98KmsU67\""
+    }
+  ];
 }
 
 enum SMSProviderConfigState {