func (s *StubKMS) CreateKey(_ context.Context, req *CreateKeyRequest) error {
	if s.containsKeyName(req.Name) {
		return ErrKeyExists
	}
	s.KeyNames = append(s.KeyNames, req.Name)
	return nil
}

// GenerateKey is a non-functional stub.
func (s StubKMS) GenerateKey(_ context.Context, req *GenerateKeyRequest) (DEK, error) {
	if !s.containsKeyName(req.Name) {
		return DEK{}, ErrKeyNotFound
	}
	return DEK{