docs: def clean_security_hash(self):
          """Check the security hash."""
          security_hash_dict = {
              'content_type': self.data.get("content_type", ""),
              'object_pk': self.data.get("object_pk", ""),
              'timestamp': self.data.get("timestamp", ""),
          }
          expected_hash = self.generate_security_hash(**security_hash_dict)
          actual_hash = self.cleaned_data["security_hash"]
          if not constant_time_compare(expected_hash, actual_hash):
              raise forms.ValidationError("Security hash check failed.")
          return actual_hash