diff --git a/releasenotes/notes/add-new-identity-clients-as-library-5f7ndha733nwdsn9.yaml b/releasenotes/notes/add-new-identity-clients-as-library-5f7ndha733nwdsn9.yaml
index 7ceb9cc..9e828f6 100644
--- a/releasenotes/notes/add-new-identity-clients-as-library-5f7ndha733nwdsn9.yaml
+++ b/releasenotes/notes/add-new-identity-clients-as-library-5f7ndha733nwdsn9.yaml
@@ -12,3 +12,4 @@
       * identity_client(v3)
       * roles_client(v3)
       * inherited_roles_client(v3)
+      * credentials_client(v3)
diff --git a/tempest/api/compute/security_groups/test_security_group_rules_negative.py b/tempest/api/compute/security_groups/test_security_group_rules_negative.py
index 853ef31..4f53663 100644
--- a/tempest/api/compute/security_groups/test_security_group_rules_negative.py
+++ b/tempest/api/compute/security_groups/test_security_group_rules_negative.py
@@ -23,7 +23,8 @@
 
 
 def not_existing_id():
-    if CONF.service_available.neutron:
+    if (CONF.service_available.neutron and
+        test.is_extension_enabled('security-group', 'network')):
         return data_utils.rand_uuid()
     else:
         return data_utils.rand_int_id(start=999)
diff --git a/tempest/services/identity/v3/json/credentials_client.py b/tempest/lib/services/identity/v3/credentials_client.py
similarity index 100%
rename from tempest/services/identity/v3/json/credentials_client.py
rename to tempest/lib/services/identity/v3/credentials_client.py
diff --git a/tempest/services/identity/v3/__init__.py b/tempest/services/identity/v3/__init__.py
index 7b08307..3f5c3d5 100644
--- a/tempest/services/identity/v3/__init__.py
+++ b/tempest/services/identity/v3/__init__.py
@@ -12,6 +12,8 @@
 # License for the specific language governing permissions and limitations under
 # the License.
 
+from tempest.lib.services.identity.v3.credentials_client import \
+    CredentialsClient
 from tempest.lib.services.identity.v3.endpoints_client import EndPointsClient
 from tempest.lib.services.identity.v3.groups_client import GroupsClient
 from tempest.lib.services.identity.v3.identity_client import IdentityClient
@@ -25,12 +27,9 @@
 from tempest.lib.services.identity.v3.token_client import V3TokenClient
 from tempest.lib.services.identity.v3.trusts_client import TrustsClient
 from tempest.lib.services.identity.v3.users_client import UsersClient
-from tempest.services.identity.v3.json.credentials_client import \
-    CredentialsClient
 from tempest.services.identity.v3.json.domains_client import DomainsClient
 
-__all__ = ['EndPointsClient', 'GroupsClient', 'IdentityClient',
-           'InheritedRolesClient', 'PoliciesClient', 'ProjectsClient',
-           'RegionsClient', 'RolesClient', 'ServicesClient', 'V3TokenClient',
-           'TrustsClient', 'UsersClient', 'CredentialsClient', 'DomainsClient',
-           ]
+__all__ = ['CredentialsClient', 'EndPointsClient', 'GroupsClient',
+           'IdentityClient', 'InheritedRolesClient', 'PoliciesClient',
+           'ProjectsClient', 'RegionsClient', 'RolesClient', 'ServicesClient',
+           'V3TokenClient', 'TrustsClient', 'UsersClient', 'DomainsClient', ]
diff --git a/tempest/tests/lib/services/base.py b/tempest/tests/lib/services/base.py
index a244aa2..3165689 100644
--- a/tempest/tests/lib/services/base.py
+++ b/tempest/tests/lib/services/base.py
@@ -12,6 +12,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import copy
 from oslo_serialization import jsonutils as json
 from oslotest import mockpatch
 
@@ -31,7 +32,7 @@
 
     def check_service_client_function(self, function, function2mock,
                                       body, to_utf=False, status=200,
-                                      headers=None, **kwargs):
+                                      headers=None, cr_blob=False, **kwargs):
         mocked_response = self.create_response(body, to_utf, status, headers)
         self.useFixture(mockpatch.Patch(
             function2mock, return_value=mocked_response))
@@ -39,4 +40,11 @@
             resp = function(**kwargs)
         else:
             resp = function()
-        self.assertEqual(body, resp)
+
+        if cr_blob:
+            evaluated_body = copy.deepcopy(body)
+            nested_json = json.loads(evaluated_body['credential']['blob'])
+            evaluated_body['credential']['blob'] = nested_json
+            self.assertEqual(evaluated_body, resp)
+        else:
+            self.assertEqual(body, resp)
diff --git a/tempest/tests/lib/services/identity/v3/test_credentials_client.py b/tempest/tests/lib/services/identity/v3/test_credentials_client.py
new file mode 100644
index 0000000..a2a22ff
--- /dev/null
+++ b/tempest/tests/lib/services/identity/v3/test_credentials_client.py
@@ -0,0 +1,179 @@
+# Copyright 2016 NEC Corporation.  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.
+
+from tempest.lib.services.identity.v3 import credentials_client
+from tempest.tests.lib import fake_auth_provider
+from tempest.tests.lib.services import base
+
+
+class TestCredentialsClient(base.BaseServiceTest):
+    FAKE_CREATE_CREDENTIAL = {
+        "credential": {
+            "blob": "{\"access\":\"181920\",\"secret\":\"secretKey\"}",
+            "project_id": "731fc6f265cd486d900f16e84c5cb594",
+            "type": "ec2",
+            "user_id": "bb5476fd12884539b41d5a88f838d773"
+        }
+    }
+
+    FAKE_INFO_CREDENTIAL = {
+        "credential": {
+            "user_id": "bb5476fd12884539b41d5a88f838d773",
+            "links": {
+                "self": "http://example.com/identity/v3/credentials/" +
+                        "207e9b76935efc03804d3dd6ab52d22e9b22a0711e4" +
+                        "ada4ff8b76165a07311d7"
+            },
+            "blob": "{\"access\": \"a42a27755ce6442596b049bd7dd8a563\"," +
+                    " \"secret\": \"71faf1d40bb24c82b479b1c6fbbd9f0c\"}",
+            "project_id": "6e01855f345f4c59812999b5e459137d",
+            "type": "ec2",
+            "id": "207e9b76935efc03804d3dd6ab52d22e9b22a0711e4ada4f"
+        }
+    }
+
+    FAKE_LIST_CREDENTIALS = {
+        "credentials": [
+            {
+                "user_id": "bb5476fd12884539b41d5a88f838d773",
+                "links": {
+                    "self": "http://example.com/identity/v3/credentials/" +
+                            "207e9b76935efc03804d3dd6ab52d22e9b22a0711e4" +
+                            "ada4ff8b76165a07311d7"
+                },
+                "blob": "{\"access\": \"a42a27755ce6442596b049bd7dd8a563\"," +
+                        " \"secret\": \"71faf1d40bb24c82b479b1c6fbbd9f0c\"," +
+                        " \"trust_id\": null}",
+                "project_id": "6e01855f345f4c59812999b5e459137d",
+                "type": "ec2",
+                "id": "207e9b76935efc03804d3dd6ab52d22e9b22a0711e4ada4f"
+            },
+            {
+                "user_id": "6f556708d04b4ea6bc72d7df2296b71a",
+                "links": {
+                    "self": "http://example.com/identity/v3/credentials/" +
+                            "2441494e52ab6d594a34d74586075cb299489bdd1e9" +
+                            "389e3ab06467a4f460609"
+                },
+                "blob": "{\"access\": \"7da79ff0aa364e1396f067e352b9b79a\"," +
+                        " \"secret\": \"7a18d68ba8834b799d396f3ff6f1e98c\"," +
+                        " \"trust_id\": null}",
+                "project_id": "1a1d14690f3c4ec5bf5f321c5fde3c16",
+                "type": "ec2",
+                "id": "2441494e52ab6d594a34d74586075cb299489bdd1e9389e3"
+            },
+            {
+                "user_id": "c14107e65d5c4a7f8894fc4b3fc209ff",
+                "links": {
+                    "self": "http://example.com/identity/v3/credentials/" +
+                            "3397b204b5f04c495bcdc8f34c8a39996f280f91726" +
+                            "58241873e15f070ec79d7"
+                },
+                "blob": "{\"access\": \"db9c58a558534a10a070110de4f9f20c\"," +
+                        " \"secret\": \"973e790b88db447ba6f93bca02bc745b\"," +
+                        " \"trust_id\": null}",
+                "project_id": "7396e43183db40dcbf40dd727637b548",
+                "type": "ec2",
+                "id": "3397b204b5f04c495bcdc8f34c8a39996f280f9172658241"
+            },
+            {
+                "user_id": "bb5476fd12884539b41d5a88f838d773",
+                "links": {
+                    "self": "http://example.com/identity/v3/credentials/" +
+                            "7ef4faa904ae7b8b4ddc7bad15b05ee359dad7d7a9b" +
+                            "82861d4ad92fdbbb2eb4e"
+                },
+                "blob": "{\"access\": \"7d7559359b57419eb5f5f5dcd65ab57d\"," +
+                        " \"secret\": \"570652bcf8c2483c86eb29e9734eed3c\"," +
+                        " \"trust_id\": null}",
+                "project_id": "731fc6f265cd486d900f16e84c5cb594",
+                "type": "ec2",
+                "id": "7ef4faa904ae7b8b4ddc7bad15b05ee359dad7d7a9b82861"
+            },
+        ],
+        "links": {
+            "self": "http://example.com/identity/v3/credentials",
+            "previous": None,
+            "next": None
+        }
+    }
+
+    def setUp(self):
+        super(TestCredentialsClient, self).setUp()
+        fake_auth = fake_auth_provider.FakeAuthProvider()
+        self.client = credentials_client.CredentialsClient(fake_auth,
+                                                           'identity',
+                                                           'regionOne')
+
+    def _test_create_credential(self, bytes_body=False):
+        self.check_service_client_function(
+            self.client.create_credential,
+            'tempest.lib.common.rest_client.RestClient.post',
+            self.FAKE_CREATE_CREDENTIAL,
+            bytes_body, status=201, cr_blob=True)
+
+    def _test_show_credential(self, bytes_body=False):
+        self.check_service_client_function(
+            self.client.show_credential,
+            'tempest.lib.common.rest_client.RestClient.get',
+            self.FAKE_INFO_CREDENTIAL,
+            bytes_body, cr_blob=True,
+            credential_id="207e9b76935efc03804d3dd6ab52d22e9b22a0711e4ada4f")
+
+    def _test_update_credential(self, bytes_body=False):
+        self.check_service_client_function(
+            self.client.update_credential,
+            'tempest.lib.common.rest_client.RestClient.patch',
+            self.FAKE_INFO_CREDENTIAL,
+            bytes_body, cr_blob=True,
+            credential_id="207e9b76935efc03804d3dd6ab52d22e9b22a0711e4ada4f")
+
+    def _test_list_credentials(self, bytes_body=False):
+        self.check_service_client_function(
+            self.client.list_credentials,
+            'tempest.lib.common.rest_client.RestClient.get',
+            self.FAKE_LIST_CREDENTIALS,
+            bytes_body)
+
+    def test_create_credential_with_str_body(self):
+        self._test_create_credential()
+
+    def test_create_credential_with_bytes_body(self):
+        self._test_create_credential(bytes_body=True)
+
+    def test_show_credential_with_str_body(self):
+        self._test_show_credential()
+
+    def test_show_credential_with_bytes_body(self):
+        self._test_show_credential(bytes_body=True)
+
+    def test_update_credential_with_str_body(self):
+        self._test_update_credential()
+
+    def test_update_credential_with_bytes_body(self):
+        self._test_update_credential(bytes_body=True)
+
+    def test_list_credentials_with_str_body(self):
+        self._test_list_credentials()
+
+    def test_list_credentials_with_bytes_body(self):
+        self._test_list_credentials(bytes_body=True)
+
+    def test_delete_credential(self):
+        self.check_service_client_function(
+            self.client.delete_credential,
+            'tempest.lib.common.rest_client.RestClient.delete',
+            {},
+            credential_id="207e9b76935efc03804d3dd6ab52d22e9b22a0711e4ada4f",
+            status=204)