From 2d45f33d435a2b7708c24dccfe53561355193d42 Mon Sep 17 00:00:00 2001
From: Hao Shen <hshen@purestorage.com>
Date: Tue, 31 Jan 2017 09:06:24 -0800
Subject: [PATCH] Add MAC operation support for client

---
 kmip/demos/pie/mac.py                        |  59 +++++++++++
 kmip/demos/utils.py                          |  35 +++++--
 kmip/pie/api.py                              |  14 +++
 kmip/pie/client.py                           |  55 ++++++++++
 kmip/services/kmip_client.py                 |  49 ++++++++-
 kmip/services/results.py                     |  17 ++++
 kmip/tests/unit/pie/test_api.py              |  10 ++
 kmip/tests/unit/pie/test_client.py           | 102 +++++++++++++++++++
 kmip/tests/unit/services/test_kmip_client.py |  92 +++++++++++++++++
 9 files changed, 423 insertions(+), 10 deletions(-)
 create mode 100644 kmip/demos/pie/mac.py

diff --git a/kmip/demos/pie/mac.py b/kmip/demos/pie/mac.py
new file mode 100644
index 0000000..8dd8d34
--- /dev/null
+++ b/kmip/demos/pie/mac.py
@@ -0,0 +1,59 @@
+# Copyright (c) 2017 Pure Storage, Inc. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+import logging
+import sys
+import binascii
+
+from kmip.core import enums
+from kmip.demos import utils
+
+from kmip.pie import client
+
+
+if __name__ == '__main__':
+    logger = utils.build_console_logger(logging.INFO)
+
+    # Build and parse arguments
+    parser = utils.build_cli_parser(enums.Operation.MAC)
+    opts, args = parser.parse_args(sys.argv[1:])
+
+    config = opts.config
+    uid = opts.uuid
+    algorithm = opts.algorithm
+
+    data = (
+        b'\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0A\x0B\x0C\x0D\x0E'
+        b'\x0F')
+
+    # Exit early if the arguments are not specified
+    if uid is None:
+        logger.error('No UUID provided, exiting early from demo')
+        sys.exit()
+    if algorithm is None:
+        logger.error('No algorithm provided, exiting early from demo')
+        sys.exit()
+
+    algorithm = getattr(enums.CryptographicAlgorithm, algorithm, None)
+
+    # Build the client and connect to the server
+    with client.ProxyKmipClient(config=config) as client:
+        try:
+            uid, mac_data = client.mac(uid, algorithm, data)
+            logger.info("Successfully done MAC using key with ID: "
+                        "{0}".format(uid))
+            logger.info("MACed data: {0}".format(
+                str(binascii.hexlify(mac_data))))
+        except Exception as e:
+            logger.error(e)
diff --git a/kmip/demos/utils.py b/kmip/demos/utils.py
index 7212e0c..b6d7796 100644
--- a/kmip/demos/utils.py
+++ b/kmip/demos/utils.py
@@ -214,15 +214,32 @@ def build_cli_parser(operation=None):
                   "SECRET_DATA"))
     elif operation is Operation.DISCOVER_VERSIONS:
         parser.add_option(
-                "-v",
-                "--protocol-versions",
-                action="store",
-                type="str",
-                default=None,
-                dest="protocol_versions",
-                help=("Protocol versions supported by client. "
-                      "ex. '1.1,1.2 1.3'"))
-
+            "-v",
+            "--protocol-versions",
+            action="store",
+            type="str",
+            default=None,
+            dest="protocol_versions",
+            help=("Protocol versions supported by client. "
+                  "ex. '1.1,1.2 1.3'"))
+    elif operation is Operation.MAC:
+        parser.add_option(
+            "-i",
+            "--uuid",
+            action="store",
+            type="str",
+            default=None,
+            dest="uuid",
+            help="The unique ID of the managed object that is the key"
+                 "to use for the MAC operation")
+        parser.add_option(
+            "-a",
+            "--algorithm",
+            action="store",
+            type="str",
+            default=None,
+            dest="algorithm",
+            help="Encryption algorithm for the secret (e.g., AES)")
     return parser
 
 
diff --git a/kmip/pie/api.py b/kmip/pie/api.py
index 44b07ac..45f1121 100644
--- a/kmip/pie/api.py
+++ b/kmip/pie/api.py
@@ -90,3 +90,17 @@ class KmipClient:
             uid (string): The unique ID of the managed object to destroy.
         """
         pass
+
+    @abc.abstractmethod
+    def mac(self, uid, algorithm, data):
+        """
+        Get the message authentication code for data.
+
+        Args:
+            uid (string): The unique ID of the managed object that is the key
+                to use for the MAC operation.
+            algorithm (CryptographicAlgorithm): An enumeration defining the
+                algorithm to use to generate the MAC.
+            data (string): The data to be MACed.
+        """
+        pass
diff --git a/kmip/pie/client.py b/kmip/pie/client.py
index a1e5b72..7cf98ce 100644
--- a/kmip/pie/client.py
+++ b/kmip/pie/client.py
@@ -21,6 +21,9 @@ from kmip.core import objects as cobjects
 
 from kmip.core.factories import attributes
 
+from kmip.core.attributes import CryptographicParameters, \
+    CryptographicAlgorithm
+
 from kmip.pie import api
 from kmip.pie import exceptions
 from kmip.pie import factory
@@ -476,6 +479,58 @@ class ProxyKmipClient(api.KmipClient):
             message = result.result_message.value
             raise exceptions.KmipOperationFailure(status, reason, message)
 
+    def mac(self, uid, algorithm, data):
+        """
+        Get the message authentication code for data.
+
+        Args:
+            uid (string): The unique ID of the managed object that is the key
+                to use for the MAC operation.
+            algorithm (CryptographicAlgorithm): An enumeration defining the
+                algorithm to use to generate the MAC.
+            data (string): The data to be MACed.
+
+
+        Returns:
+            string: The unique ID of the managed object that is the key
+                to use for the MAC operation.
+            string: The data MACed
+
+        Raises:
+            ClientConnectionNotOpen: if the client connection is unusable
+            KmipOperationFailure: if the operation result is a failure
+            TypeError: if the input arguments are invalid
+        """
+        # Check inputs
+        if not isinstance(uid, six.string_types):
+            raise TypeError("uid must be a string")
+        if not isinstance(algorithm, enums.CryptographicAlgorithm):
+            raise TypeError(
+                "algorithm must be a CryptographicAlgorithm enumeration")
+        if not isinstance(data, six.binary_type):
+            raise TypeError(
+                "data must be bytes")
+
+        # Verify that operations can be given at this time
+        if not self._is_open:
+            raise exceptions.ClientConnectionNotOpen()
+
+        parameters_attribute = CryptographicParameters(
+            cryptographic_algorithm=CryptographicAlgorithm(algorithm))
+
+        # Create the symmetric key and handle the results
+        result = self.proxy.mac(uid, parameters_attribute, data)
+
+        status = result.result_status.value
+        if status == enums.ResultStatus.SUCCESS:
+            uid = result.uuid.value
+            mac_data = result.mac_data.value
+            return uid, mac_data
+        else:
+            reason = result.result_reason.value
+            message = result.result_message.value
+            raise exceptions.KmipOperationFailure(status, reason, message)
+
     def _build_key_attributes(self, algorithm, length):
         # Build a list of core key attributes.
         algorithm_attribute = self.attribute_factory.create_attribute(
diff --git a/kmip/services/kmip_client.py b/kmip/services/kmip_client.py
index 911d092..5d4591b 100644
--- a/kmip/services/kmip_client.py
+++ b/kmip/services/kmip_client.py
@@ -27,6 +27,7 @@ from kmip.services.results import QueryResult
 from kmip.services.results import RegisterResult
 from kmip.services.results import RekeyKeyPairResult
 from kmip.services.results import RevokeResult
+from kmip.services.results import MACResult
 
 from kmip.core import attributes as attr
 
@@ -60,6 +61,7 @@ from kmip.core.messages.payloads import query
 from kmip.core.messages.payloads import rekey_key_pair
 from kmip.core.messages.payloads import register
 from kmip.core.messages.payloads import revoke
+from kmip.core.messages.payloads import mac
 
 from kmip.services.server.kmip_protocol import KMIPProtocol
 
@@ -428,6 +430,14 @@ class KMIPProxy(KMIP):
             results = self._process_batch_items(response)
             return results[0]
 
+    def mac(self, unique_identifier=None, cryptographic_parameters=None,
+            data=None, credential=None):
+        return self._mac(
+            unique_identifier=unique_identifier,
+            cryptographic_parameters=cryptographic_parameters,
+            data=data,
+            credential=credential)
+
     def _create(self,
                 object_type=None,
                 template_attribute=None,
@@ -919,6 +929,43 @@ class KMIPProxy(KMIP):
                               uuids)
         return result
 
+    def _mac(self,
+             unique_identifier=None,
+             cryptographic_parameters=None,
+             data=None,
+             credential=None):
+        operation = Operation(OperationEnum.MAC)
+
+        req_pl = mac.MACRequestPayload(
+            unique_identifier=attr.UniqueIdentifier(unique_identifier),
+            cryptographic_parameters=cryptographic_parameters,
+            data=objects.Data(data))
+        batch_item = messages.RequestBatchItem(operation=operation,
+                                               request_payload=req_pl)
+
+        message = self._build_request_message(credential, [batch_item])
+        self._send_message(message)
+        message = messages.ResponseMessage()
+        data = self._receive_message()
+        message.read(data)
+        batch_items = message.batch_items
+        batch_item = batch_items[0]
+        payload = batch_item.response_payload
+
+        if payload is None:
+            payload_unique_identifier = None
+            payload_mac_data = None
+        else:
+            payload_unique_identifier = payload.unique_identifier
+            payload_mac_data = payload.mac_data
+
+        result = MACResult(batch_item.result_status,
+                           batch_item.result_reason,
+                           batch_item.result_message,
+                           payload_unique_identifier,
+                           payload_mac_data)
+        return result
+
     # TODO (peter-hamilton) Augment to handle device credentials
     def _build_credential(self):
         if (self.username is None) and (self.password is None):
@@ -937,7 +984,7 @@ class KMIPProxy(KMIP):
         return credential
 
     def _build_request_message(self, credential, batch_items):
-        protocol_version = ProtocolVersion.create(1, 1)
+        protocol_version = ProtocolVersion.create(1, 2)
 
         if credential is None:
             credential = self._build_credential()
diff --git a/kmip/services/results.py b/kmip/services/results.py
index 73d34e2..96622d5 100644
--- a/kmip/services/results.py
+++ b/kmip/services/results.py
@@ -295,3 +295,20 @@ class RevokeResult(OperationResult):
         super(RevokeResult, self).__init__(
             result_status, result_reason, result_message)
         self.unique_identifier = unique_identifier
+
+
+class MACResult(OperationResult):
+
+    def __init__(self,
+                 result_status,
+                 result_reason=None,
+                 result_message=None,
+                 uuid=None,
+                 mac_data=None):
+        super(MACResult, self).__init__(
+            result_status,
+            result_reason,
+            result_message
+        )
+        self.uuid = uuid
+        self.mac_data = mac_data
diff --git a/kmip/tests/unit/pie/test_api.py b/kmip/tests/unit/pie/test_api.py
index b4c259b..5994935 100644
--- a/kmip/tests/unit/pie/test_api.py
+++ b/kmip/tests/unit/pie/test_api.py
@@ -44,6 +44,9 @@ class DummyKmipClient(api.KmipClient):
     def destroy(self, uid):
         super(DummyKmipClient, self).destroy(uid)
 
+    def mac(self, uid, algorithm, data):
+        super(DummyKmipClient, self).mac(uid, algorithm, data)
+
 
 class TestKmipClient(testtools.TestCase):
     """
@@ -106,3 +109,10 @@ class TestKmipClient(testtools.TestCase):
         """
         dummy = DummyKmipClient()
         dummy.destroy('uid')
+
+    def test_mac(self):
+        """
+        Test that the mac method can be called without error.
+        """
+        dummy = DummyKmipClient()
+        dummy.mac('uid', 'algorithm', 'data')
diff --git a/kmip/tests/unit/pie/test_client.py b/kmip/tests/unit/pie/test_client.py
index d007157..4e83770 100644
--- a/kmip/tests/unit/pie/test_client.py
+++ b/kmip/tests/unit/pie/test_client.py
@@ -1056,3 +1056,105 @@ class TestProxyKmipClient(testtools.TestCase):
         self.assertIsInstance(opn.attribute_value, attr.OperationPolicyName)
         self.assertEqual(opn.attribute_name.value, 'Operation Policy Name')
         self.assertEqual(opn.attribute_value.value, 'test')
+
+    @mock.patch('kmip.pie.client.KMIPProxy',
+                mock.MagicMock(spec_set=KMIPProxy))
+    def test_mac(self):
+        """
+        Test the MAC client with proper input.
+        """
+        uuid = 'aaaaaaaa-1111-2222-3333-ffffffffffff'
+        algorithm = enums.CryptographicAlgorithm.HMAC_SHA256
+        data = (b'\x00\x01\x02\x03\x04')
+
+        result = results.MACResult(
+            contents.ResultStatus(enums.ResultStatus.SUCCESS),
+            uuid=attr.UniqueIdentifier(uuid),
+            mac_data=obj.MACData(data))
+
+        with ProxyKmipClient() as client:
+            client.proxy.mac.return_value = result
+
+            uid, mac_data = client.mac(uuid, algorithm, data)
+            self.assertEqual(uid, uuid)
+            self.assertEqual(mac_data, data)
+
+    @mock.patch('kmip.pie.client.KMIPProxy',
+                mock.MagicMock(spec_set=KMIPProxy))
+    def test_mac_on_invalid_inputs(self):
+        """
+        Test that a TypeError exception is raised when wrong type
+        of arguments are given to mac operation.
+        """
+        uuid = 'aaaaaaaa-1111-2222-3333-ffffffffffff'
+        uuid_invalid = int(123)
+
+        algorithm = enums.CryptographicAlgorithm.HMAC_SHA256
+        algorithm_invalid = enums.CryptographicUsageMask.MAC_GENERATE
+
+        data = (b'\x00\x01\x02\x03\x04')
+        data_invalid = int(123)
+
+        result = results.MACResult(
+            contents.ResultStatus(enums.ResultStatus.SUCCESS),
+            uuid=attr.UniqueIdentifier(uuid),
+            mac_data=obj.MACData(data))
+
+        args = [uuid_invalid, algorithm, data]
+        with ProxyKmipClient() as client:
+            client.proxy.mac.return_value = result
+            self.assertRaises(TypeError, client.mac, *args)
+
+        args = [uuid, algorithm_invalid, data]
+        with ProxyKmipClient() as client:
+            client.proxy.mac.return_value = result
+            self.assertRaises(TypeError, client.mac, *args)
+
+        args = [uuid, algorithm, data_invalid]
+        with ProxyKmipClient() as client:
+            client.proxy.mac.return_value = result
+            self.assertRaises(TypeError, client.mac, *args)
+
+    @mock.patch('kmip.pie.client.KMIPProxy',
+                mock.MagicMock(spec_set=KMIPProxy))
+    def test_mac_on_operation_failure(self):
+        """
+        Test that a KmipOperationFailure exception is raised when the
+        backend fails to generate MAC.
+        """
+        uuid = 'aaaaaaaa-1111-2222-3333-ffffffffffff'
+        algorithm = enums.CryptographicAlgorithm.HMAC_SHA256
+        data = (b'\x00\x01\x02\x03\x04')
+
+        status = enums.ResultStatus.OPERATION_FAILED
+        reason = enums.ResultReason.GENERAL_FAILURE
+        message = "Test failure message"
+
+        result = results.OperationResult(
+            contents.ResultStatus(status),
+            contents.ResultReason(reason),
+            contents.ResultMessage(message))
+        error_msg = str(KmipOperationFailure(status, reason, message))
+
+        client = ProxyKmipClient()
+        client.open()
+        client.proxy.mac.return_value = result
+        args = [uuid, algorithm, data]
+
+        self.assertRaisesRegexp(
+            KmipOperationFailure, error_msg, client.mac, *args)
+
+    @mock.patch('kmip.pie.client.KMIPProxy',
+                mock.MagicMock(spec_set=KMIPProxy))
+    def test_mac_on_closed(self):
+        """
+        Test that a ClientConnectionNotOpen exception is raised when trying
+        to do mac on an unopened client connection.
+        """
+        client = ProxyKmipClient()
+        uuid = 'aaaaaaaa-1111-2222-3333-ffffffffffff'
+        algorithm = enums.CryptographicAlgorithm.HMAC_SHA256
+        data = (b'\x00\x01\x02\x03\x04')
+        args = [uuid, algorithm, data]
+        self.assertRaises(
+            ClientConnectionNotOpen, client.mac, *args)
diff --git a/kmip/tests/unit/services/test_kmip_client.py b/kmip/tests/unit/services/test_kmip_client.py
index 0c515e4..245e9a1 100644
--- a/kmip/tests/unit/services/test_kmip_client.py
+++ b/kmip/tests/unit/services/test_kmip_client.py
@@ -16,6 +16,9 @@
 from testtools import TestCase
 
 from kmip.core.attributes import PrivateKeyUniqueIdentifier
+from kmip.core.attributes import CryptographicParameters, \
+                                 CryptographicAlgorithm
+
 
 from kmip.core.enums import AuthenticationSuite
 from kmip.core.enums import ConformanceClause
@@ -24,6 +27,8 @@ from kmip.core.enums import ResultStatus as ResultStatusEnum
 from kmip.core.enums import ResultReason as ResultReasonEnum
 from kmip.core.enums import Operation as OperationEnum
 from kmip.core.enums import QueryFunction as QueryFunctionEnum
+from kmip.core.enums import CryptographicAlgorithm as \
+                            CryptographicAlgorithmEnum
 
 from kmip.core.factories.attributes import AttributeFactory
 from kmip.core.factories.credentials import CredentialFactory
@@ -714,6 +719,93 @@ class TestKMIPClient(TestCase):
         self.client._create_socket(sock)
         self.assertEqual(ssl.SSLSocket, type(self.client.socket))
 
+    @mock.patch('kmip.services.kmip_client.KMIPProxy._send_message',
+                mock.MagicMock())
+    @mock.patch('kmip.services.kmip_client.KMIPProxy._receive_message',
+                mock.MagicMock())
+    def test_mac(self):
+
+        from kmip.core.utils import BytearrayStream
+
+        request_expected = (
+            b'\x42\x00\x78\x01\x00\x00\x00\xa0\x42\x00\x77\x01\x00\x00\x00\x38'
+            b'\x42\x00\x69\x01\x00\x00\x00\x20\x42\x00\x6a\x02\x00\x00\x00\x04'
+            b'\x00\x00\x00\x01\x00\x00\x00\x00\x42\x00\x6b\x02\x00\x00\x00\x04'
+            b'\x00\x00\x00\x02\x00\x00\x00\x00\x42\x00\x0d\x02\x00\x00\x00\x04'
+            b'\x00\x00\x00\x01\x00\x00\x00\x00\x42\x00\x0f\x01\x00\x00\x00\x58'
+            b'\x42\x00\x5c\x05\x00\x00\x00\x04\x00\x00\x00\x23\x00\x00\x00\x00'
+            b'\x42\x00\x79\x01\x00\x00\x00\x40\x42\x00\x94\x07\x00\x00\x00\x01'
+            b'\x31\x00\x00\x00\x00\x00\x00\x00\x42\x00\x2b\x01\x00\x00\x00\x10'
+            b'\x42\x00\x28\x05\x00\x00\x00\x04\x00\x00\x00\x0b\x00\x00\x00\x00'
+            b'\x42\x00\xc2\x08\x00\x00\x00\x10\x00\x01\x02\x03\x04\x05\x06\x07'
+            b'\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f')
+        response = (
+            b'\x42\x00\x7b\x01\x00\x00\x00\xd8\x42\x00\x7a\x01\x00\x00\x00\x48'
+            b'\x42\x00\x69\x01\x00\x00\x00\x20\x42\x00\x6a\x02\x00\x00\x00\x04'
+            b'\x00\x00\x00\x01\x00\x00\x00\x00\x42\x00\x6b\x02\x00\x00\x00\x04'
+            b'\x00\x00\x00\x02\x00\x00\x00\x00\x42\x00\x92\x09\x00\x00\x00\x08'
+            b'\x00\x00\x00\x00\x58\x8a\x3f\x23\x42\x00\x0d\x02\x00\x00\x00\x04'
+            b'\x00\x00\x00\x01\x00\x00\x00\x00\x42\x00\x0f\x01\x00\x00\x00\x80'
+            b'\x42\x00\x5c\x05\x00\x00\x00\x04\x00\x00\x00\x23\x00\x00\x00\x00'
+            b'\x42\x00\x7f\x05\x00\x00\x00\x04\x00\x00\x00\x00\x00\x00\x00\x00'
+            b'\x42\x00\x7c\x01\x00\x00\x00\x58\x42\x00\x94\x07\x00\x00\x00\x01'
+            b'\x31\x00\x00\x00\x00\x00\x00\x00\x42\x00\xc6\x08\x00\x00\x00\x40'
+            b'\x99\x8b\x55\x59\x90\x9b\x85\x87\x5b\x90\x63\x13\x12\xbb\x32\x9f'
+            b'\x6a\xc4\xed\x97\x6e\xac\x99\xe5\x21\x53\xc4\x19\x28\xf2\x2a\x5b'
+            b'\xef\x79\xa4\xbe\x05\x3b\x31\x49\x19\xe0\x75\x23\xb9\xbe\xc8\x23'
+            b'\x35\x60\x7e\x49\xba\xa9\x7e\xe0\x9e\x6b\x3d\x55\xf4\x51\xff\x7c'
+        )
+        response_no_payload = (
+            b'\x42\x00\x7b\x01\x00\x00\x00\x78\x42\x00\x7a\x01\x00\x00\x00\x48'
+            b'\x42\x00\x69\x01\x00\x00\x00\x20\x42\x00\x6a\x02\x00\x00\x00\x04'
+            b'\x00\x00\x00\x01\x00\x00\x00\x00\x42\x00\x6b\x02\x00\x00\x00\x04'
+            b'\x00\x00\x00\x02\x00\x00\x00\x00\x42\x00\x92\x09\x00\x00\x00\x08'
+            b'\x00\x00\x00\x00\x58\x8a\x3f\x23\x42\x00\x0d\x02\x00\x00\x00\x04'
+            b'\x00\x00\x00\x01\x00\x00\x00\x00\x42\x00\x0f\x01\x00\x00\x00\x80'
+            b'\x42\x00\x5c\x05\x00\x00\x00\x04\x00\x00\x00\x23\x00\x00\x00\x00'
+            b'\x42\x00\x7f\x05\x00\x00\x00\x04\x00\x00\x00\x00\x00\x00\x00\x00'
+        )
+
+        data = (b'\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0A\x0B'
+                b'\x0C\x0D\x0E\x0F')
+
+        mdata = (b'\x99\x8b\x55\x59\x90\x9b\x85\x87\x5b\x90\x63\x13'
+                 b'\x12\xbb\x32\x9f'
+                 b'\x6a\xc4\xed\x97\x6e\xac\x99\xe5\x21\x53\xc4\x19'
+                 b'\x28\xf2\x2a\x5b'
+                 b'\xef\x79\xa4\xbe\x05\x3b\x31\x49\x19\xe0\x75\x23'
+                 b'\xb9\xbe\xc8\x23'
+                 b'\x35\x60\x7e\x49\xba\xa9\x7e\xe0\x9e\x6b\x3d\x55'
+                 b'\xf4\x51\xff\x7c')
+
+        def verify_request(message):
+            stream = BytearrayStream()
+            message.write(stream)
+            self.assertEqual(stream.buffer, request_expected)
+
+        uuid = '1'
+
+        cryptographic_parameters = CryptographicParameters(
+            cryptographic_algorithm=CryptographicAlgorithm(
+                CryptographicAlgorithmEnum.HMAC_SHA512)
+        )
+
+        self.client._send_message.side_effect = verify_request
+        self.client._receive_message.return_value = BytearrayStream(response)
+
+        result = self.client.mac(uuid, cryptographic_parameters,
+                                 data)
+        self.assertEqual(result.uuid.value, uuid)
+        self.assertEqual(result.mac_data.value, mdata)
+
+        self.client._receive_message.return_value = \
+            BytearrayStream(response_no_payload)
+
+        result = self.client.mac(uuid, cryptographic_parameters,
+                                 data)
+        self.assertEqual(result.uuid, None)
+        self.assertEqual(result.mac_data, None)
+
 
 class TestClientProfileInformation(TestCase):
     """