diff --git a/tempest/api/identity/admin/v3/test_trusts.py b/tempest/api/identity/admin/v3/test_trusts.py
index 13c47eb..be527d0 100644
--- a/tempest/api/identity/admin/v3/test_trusts.py
+++ b/tempest/api/identity/admin/v3/test_trusts.py
@@ -16,8 +16,8 @@
 from tempest_lib import exceptions as lib_exc
 
 from tempest.api.identity import base
-from tempest import auth
 from tempest import clients
+from tempest.common import cred_provider
 from tempest.common.utils import data_utils
 from tempest import config
 from tempest import exceptions
@@ -89,7 +89,7 @@
         self.assertIsNotNone(self.trustee_user_id)
 
         # Initialize a new client with the trustor credentials
-        creds = auth.get_credentials(
+        creds = cred_provider.get_credentials(
             username=self.trustor_username,
             password=self.trustor_password,
             tenant_name=self.trustor_project_name)
diff --git a/tempest/api/identity/base.py b/tempest/api/identity/base.py
index 90e1a9e..e428071 100644
--- a/tempest/api/identity/base.py
+++ b/tempest/api/identity/base.py
@@ -15,8 +15,8 @@
 
 from tempest_lib import exceptions as lib_exc
 
-from tempest import auth
 from tempest import clients
+from tempest.common import cred_provider
 from tempest.common.utils import data_utils
 from tempest import config
 from tempest.openstack.common import log as logging
@@ -149,11 +149,11 @@
 
         @property
         def test_credentials(self):
-            return auth.get_credentials(username=self.test_user,
-                                        user_id=self.user['id'],
-                                        password=self.test_password,
-                                        tenant_name=self.test_tenant,
-                                        tenant_id=self.tenant['id'])
+            return cred_provider.get_credentials(username=self.test_user,
+                                                 user_id=self.user['id'],
+                                                 password=self.test_password,
+                                                 tenant_name=self.test_tenant,
+                                                 tenant_id=self.tenant['id'])
 
         def setup_test_user(self):
             """Set up a test user."""
diff --git a/tempest/auth.py b/tempest/auth.py
index 5820893..9645a2e 100644
--- a/tempest/auth.py
+++ b/tempest/auth.py
@@ -44,7 +44,6 @@
         :param interface: 'json' or 'xml'. Applicable for tempest client only
             (deprecated: only json now supported)
         """
-        credentials = self._convert_credentials(credentials)
         if self.check_credentials(credentials):
             self.credentials = credentials
         else:
@@ -54,13 +53,6 @@
         self.alt_auth_data = None
         self.alt_part = None
 
-    def _convert_credentials(self, credentials):
-        # Support dict credentials for backwards compatibility
-        if isinstance(credentials, dict):
-            return get_credentials(**credentials)
-        else:
-            return credentials
-
     def __str__(self):
         return "Creds :{creds}, interface: {interface}, " \
                "cached auth data: {cache}".format(
@@ -440,7 +432,11 @@
             datetime.datetime.utcnow()
 
 
-def get_credentials(fill_in=True, **kwargs):
+def is_identity_version_supported(identity_version):
+    return identity_version in IDENTITY_VERSION
+
+
+def get_credentials(fill_in=True, identity_version='v2', **kwargs):
     """
     Builds a credentials object based on the configured auth_version
 
@@ -448,6 +444,8 @@
            details provided by the identity service. When fill_in is not
            specified, credentials are not validated. Validation can be invoked
            by invoking ``is_valid()``
+    :param identity_version (string): identity API version is used to
+           select the matching auth provider and credentials class
     :param kwargs (dict): Dict of credential key/value pairs
 
     Examples:
@@ -458,14 +456,13 @@
         Returns credentials including IDs:
         >>> get_credentials(username='foo', password='bar', fill_in=True)
     """
-    if CONF.identity.auth_version == 'v2':
-        credential_class = KeystoneV2Credentials
-        auth_provider_class = KeystoneV2AuthProvider
-    elif CONF.identity.auth_version == 'v3':
-        credential_class = KeystoneV3Credentials
-        auth_provider_class = KeystoneV3AuthProvider
-    else:
-        raise exceptions.InvalidConfiguration('Unsupported auth version')
+    if not is_identity_version_supported(identity_version):
+        raise exceptions.InvalidIdentityVersion(
+            identity_version=identity_version)
+
+    credential_class, auth_provider_class = IDENTITY_VERSION.get(
+        identity_version)
+
     creds = credential_class(**kwargs)
     # Fill in the credentials fields that were not specified
     if fill_in:
@@ -638,3 +635,7 @@
              self.project_id is not None,
              self.project_name is not None and valid_project_domain])
         return all([self.password is not None, valid_user, valid_project])
+
+
+IDENTITY_VERSION = {'v2': (KeystoneV2Credentials, KeystoneV2AuthProvider),
+                    'v3': (KeystoneV3Credentials, KeystoneV3AuthProvider)}
diff --git a/tempest/cmd/cleanup.py b/tempest/cmd/cleanup.py
index 28992b9..c52704a 100755
--- a/tempest/cmd/cleanup.py
+++ b/tempest/cmd/cleanup.py
@@ -54,9 +54,9 @@
 import json
 import sys
 
-from tempest import auth
 from tempest import clients
 from tempest.cmd import cleanup_service
+from tempest.common import cred_provider
 from tempest import config
 from tempest.openstack.common import log as logging
 
@@ -159,7 +159,8 @@
         kwargs = {"username": CONF.identity.admin_username,
                   "password": CONF.identity.admin_password,
                   "tenant_name": tenant['name']}
-        mgr = clients.Manager(credentials=auth.get_credentials(**kwargs))
+        mgr = clients.Manager(credentials=cred_provider.get_credentials(
+            **kwargs))
         kwargs = {'data': tenant_data,
                   'is_dry_run': is_dry_run,
                   'saved_state_json': None,
diff --git a/tempest/common/accounts.py b/tempest/common/accounts.py
index 35a1f86..dd8d498 100644
--- a/tempest/common/accounts.py
+++ b/tempest/common/accounts.py
@@ -17,7 +17,6 @@
 
 import yaml
 
-from tempest import auth
 from tempest.common import cred_provider
 from tempest import config
 from tempest import exceptions
@@ -123,7 +122,7 @@
         if self.isolated_creds.get('primary'):
             return self.isolated_creds.get('primary')
         creds = self._get_creds()
-        primary_credential = auth.get_credentials(**creds)
+        primary_credential = cred_provider.get_credentials(**creds)
         self.isolated_creds['primary'] = primary_credential
         return primary_credential
 
@@ -131,7 +130,7 @@
         if self.isolated_creds.get('alt'):
             return self.isolated_creds.get('alt')
         creds = self._get_creds()
-        alt_credential = auth.get_credentials(**creds)
+        alt_credential = cred_provider.get_credentials(**creds)
         self.isolated_creds['alt'] = alt_credential
         return alt_credential
 
@@ -189,7 +188,7 @@
             return self.isolated_creds.get('primary')
         if not self.use_default_creds:
             creds = self.get_creds(0)
-            primary_credential = auth.get_credentials(**creds)
+            primary_credential = cred_provider.get_credentials(**creds)
         else:
             primary_credential = cred_provider.get_configured_credentials(
                 'user')
@@ -201,7 +200,7 @@
             return self.isolated_creds.get('alt')
         if not self.use_default_creds:
             creds = self.get_creds(1)
-            alt_credential = auth.get_credentials(**creds)
+            alt_credential = cred_provider.get_credentials(**creds)
         else:
             alt_credential = cred_provider.get_configured_credentials(
                 'alt_user')
diff --git a/tempest/common/cred_provider.py b/tempest/common/cred_provider.py
index 07fd03f..b9ca3aa 100644
--- a/tempest/common/cred_provider.py
+++ b/tempest/common/cred_provider.py
@@ -56,7 +56,7 @@
             params[attr] = getattr(_section, prefix + "_" + attr)
     # Build and validate credentials. We are reading configured credentials,
     # so validate them even if fill_in is False
-    credentials = auth.get_credentials(fill_in=fill_in, **params)
+    credentials = get_credentials(fill_in=fill_in, **params)
     if not fill_in:
         if not credentials.is_valid():
             msg = ("The %s credentials are incorrectly set in the config file."
@@ -66,6 +66,15 @@
     return credentials
 
 
+# Wrapper around auth.get_credentials to use the configured identity version
+# is none is specified
+def get_credentials(fill_in=True, identity_version=None, **kwargs):
+    identity_version = identity_version or CONF.identity.auth_version
+    return auth.get_credentials(fill_in=fill_in,
+                                identity_version=identity_version,
+                                **kwargs)
+
+
 @six.add_metaclass(abc.ABCMeta)
 class CredentialProvider(object):
     def __init__(self, name, interface='json', password='pass',
diff --git a/tempest/common/isolated_creds.py b/tempest/common/isolated_creds.py
index 5c2fa58..3572a1d 100644
--- a/tempest/common/isolated_creds.py
+++ b/tempest/common/isolated_creds.py
@@ -15,7 +15,6 @@
 import netaddr
 from tempest_lib import exceptions as lib_exc
 
-from tempest import auth
 from tempest import clients
 from tempest.common import cred_provider
 from tempest.common.utils import data_utils
@@ -130,7 +129,7 @@
         return self._get_credentials(user, tenant)
 
     def _get_credentials(self, user, tenant):
-        return auth.get_credentials(
+        return cred_provider.get_credentials(
             username=user['name'], user_id=user['id'],
             tenant_name=tenant['name'], tenant_id=tenant['id'],
             password=self.password)
diff --git a/tempest/exceptions.py b/tempest/exceptions.py
index 81db5d9..09f7016 100644
--- a/tempest/exceptions.py
+++ b/tempest/exceptions.py
@@ -63,6 +63,10 @@
     message = "Invalid service tag"
 
 
+class InvalidIdentityVersion(TempestException):
+    message = "Invalid version %(identity_version) of the identity service"
+
+
 class TimeoutException(TempestException):
     message = "Request timed out"
 
diff --git a/tempest/stress/driver.py b/tempest/stress/driver.py
index 49fac3d..1c27815 100644
--- a/tempest/stress/driver.py
+++ b/tempest/stress/driver.py
@@ -19,8 +19,8 @@
 
 from six import moves
 
-from tempest import auth
 from tempest import clients
+from tempest.common import cred_provider
 from tempest.common import ssh
 from tempest.common.utils import data_utils
 from tempest import config
@@ -148,9 +148,9 @@
                                             password,
                                             tenant['id'],
                                             "email")
-                creds = auth.get_credentials(username=username,
-                                             password=password,
-                                             tenant_name=tenant_name)
+                creds = cred_provider.get_credentials(username=username,
+                                                      password=password,
+                                                      tenant_name=tenant_name)
                 manager = clients.Manager(credentials=creds)
 
             test_obj = importutils.import_class(test['action'])
diff --git a/tempest/tests/test_auth.py b/tempest/tests/test_auth.py
index 785880d..0317ad6 100644
--- a/tempest/tests/test_auth.py
+++ b/tempest/tests/test_auth.py
@@ -30,7 +30,7 @@
 from tempest.tests import fake_identity
 
 
-def fake_get_credentials(fill_in=True, **kwargs):
+def fake_get_credentials(fill_in=True, identity_version='v2', **kwargs):
     return fake_credentials.FakeCredentials()
 
 
@@ -81,11 +81,6 @@
     def test_check_credentials_bad_type(self):
         self.assertFalse(self.auth_provider.check_credentials([]))
 
-    def test_instantiate_with_dict(self):
-        # Dict credentials are only supported for backward compatibility
-        auth_provider = self._auth(credentials={})
-        self.assertIsInstance(auth_provider.credentials, auth.Credentials)
-
     def test_auth_data_property_when_cache_exists(self):
         self.auth_provider.cache = 'foo'
         self.useFixture(mockpatch.PatchObject(self.auth_provider,
diff --git a/tempest/tests/test_credentials.py b/tempest/tests/test_credentials.py
index 3d0e171..7621f6e 100644
--- a/tempest/tests/test_credentials.py
+++ b/tempest/tests/test_credentials.py
@@ -15,8 +15,6 @@
 
 import copy
 
-from oslo.config import cfg
-
 from tempest import auth
 from tempest.common import tempest_fixtures as fixtures
 from tempest import config
@@ -78,6 +76,7 @@
     identity_response = fake_identity._fake_v2_response
     credentials_class = auth.KeystoneV2Credentials
     tokenclient_class = v2_client.TokenClientJSON
+    identity_version = 'v2'
 
     def setUp(self):
         super(KeystoneV2CredentialsTests, self).setUp()
@@ -85,7 +84,9 @@
                        self.identity_response)
 
     def _verify_credentials(self, credentials_class, creds_dict, filled=True):
-        creds = auth.get_credentials(fill_in=filled, **creds_dict)
+        creds = auth.get_credentials(fill_in=filled,
+                                     identity_version=self.identity_version,
+                                     **creds_dict)
         self._check(creds, credentials_class, filled)
 
     def test_get_credentials(self):
@@ -156,15 +157,7 @@
     credentials_class = auth.KeystoneV3Credentials
     identity_response = fake_identity._fake_v3_response
     tokenclient_class = v3_client.V3TokenClientJSON
-
-    def setUp(self):
-        super(KeystoneV3CredentialsTests, self).setUp()
-        # Additional config items reset by cfg fixture after each test
-        cfg.CONF.set_default('auth_version', 'v3', group='identity')
-        # Identity group items
-        for prefix in ['', 'alt_', 'admin_']:
-            cfg.CONF.set_default(prefix + 'domain_name', 'fake_domain_name',
-                                 group='identity')
+    identity_version = 'v3'
 
     def test_is_not_valid(self):
         # NOTE(mtreinish) For a Keystone V3 credential object a project name