src/aws_encryption_sdk/streaming_client.py [668:673]:
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            self.output_buffer += serialize_header_auth(
                version=self._header.version,
                algorithm=self._encryption_materials.algorithm,
                header=self.output_buffer,
                data_encryption_key=self._derived_data_key,
                signer=self.signer,
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src/aws_encryption_sdk/streaming_client.py [678:683]:
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            self.output_buffer += serialize_header_auth(
                version=self._header.version,
                algorithm=self._encryption_materials.algorithm,
                header=self.output_buffer,
                data_encryption_key=self._derived_data_key,
                signer=self.signer,
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