diff --git a/commands/constructors.go b/commands/constructors.go
index 9716560..1d4b3d3 100644
--- a/commands/constructors.go
+++ b/commands/constructors.go
@@ -138,6 +138,19 @@ func CreateGetPubKeyCommand(keyID uint16) (*CommandMessage, error) {
 	return command, nil
 }
 
+func CreateDeleteObjectCommand(objID uint16, objType uint8) (*CommandMessage, error) {
+	command := &CommandMessage{
+		CommandType: CommandTypeDeleteObject,
+	}
+
+	payload := bytes.NewBuffer([]byte{})
+	binary.Write(payload, binary.BigEndian, objID)
+	binary.Write(payload, binary.BigEndian, objType)
+	command.Data = payload.Bytes()
+
+	return command, nil
+}
+
 func CreateEchoCommand(data []byte) (*CommandMessage, error) {
 	command := &CommandMessage{
 		CommandType: CommandTypeEcho,
diff --git a/commands/response.go b/commands/response.go
index f32c869..60ac2e3 100644
--- a/commands/response.go
+++ b/commands/response.go
@@ -86,12 +86,16 @@ func ParseResponse(data []byte) (Response, error) {
 		return parseCreateAsymmetricKeyResponse(payload)
 	case CommandTypeSignDataEddsa:
 		return parseSignDataEddsaResponse(payload)
+	case CommandTypeSignDataEcdsa:
+		return parseSignDataEcdsaResponse(payload)
 	case CommandTypePutAsymmetric:
 		return parsePutAsymmetricKeyResponse(payload)
 	case CommandTypeCloseSession:
 		return nil, nil
 	case CommandTypeGetPubKey:
 		return parseGetPubKeyResponse(payload)
+	case CommandTypeDeleteObject:
+		return nil, nil
 	case CommandTypeEcho:
 		return parseEchoResponse(payload)
 	case ErrorResponseCode:
@@ -153,6 +157,12 @@ func parseSignDataEddsaResponse(payload []byte) (Response, error) {
 	}, nil
 }
 
+func parseSignDataEcdsaResponse(payload []byte) (Response, error) {
+	return &SignDataEcdsaResponse{
+		Signature: payload,
+	}, nil
+}
+
 func parsePutAsymmetricKeyResponse(payload []byte) (Response, error) {
 	if len(payload) != 2 {
 		return nil, errors.New("invalid response payload length")
diff --git a/commands/types.go b/commands/types.go
index 2c3281b..d6da3e8 100644
--- a/commands/types.go
+++ b/commands/types.go
@@ -146,4 +146,13 @@ const (
 	Domain14 uint16 = 0x2000
 	Domain15 uint16 = 0x4000
 	Domain16 uint16 = 0x8000
+
+	// object types
+	ObjectTypeOpaque            uint8 = 0x01
+	ObjectTypeAuthenticationKey uint8 = 0x02
+	ObjectTypeAsymmetricKey     uint8 = 0x03
+	ObjectTypeWrapKey           uint8 = 0x04
+	ObjectTypeHmacKey           uint8 = 0x05
+	ObjectTypeTemplate          uint8 = 0x06
+	ObjectTypeOtpAeadKey        uint8 = 0x07
 )