diff --git a/freezer/tests/unit/utils/test_crypt.py b/freezer/tests/unit/utils/test_crypt.py
new file mode 100644
index 00000000..9c5d7f55
--- /dev/null
+++ b/freezer/tests/unit/utils/test_crypt.py
@@ -0,0 +1,77 @@
+# (c) Copyright 2018 ZTE Corporation.
+#
+# 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 shutil
+import sys
+import tempfile
+import unittest
+
+# import mock
+# from mock import patch
+
+from freezer.utils import crypt
+
+
+class AESCipherTestCase(unittest.TestCase):
+
+    def setUp(self):
+        super(AESCipherTestCase, self).setUp()
+        self.passwd_test_file_dir = None
+        self.passwd_test_file_name = None
+        self.create_pass_test_file()
+
+    def tearDown(self):
+        super(AESCipherTestCase, self).tearDown()
+        self.delete_pass_test_file()
+
+    def create_pass_test_file(self):
+        if self.passwd_test_file_name:
+            return
+        tmpdir = tempfile.mkdtemp()
+        FILES_DIR_PREFIX = "freezer_passwd_dir"
+        files_dir = tempfile.mkdtemp(dir=tmpdir, prefix=FILES_DIR_PREFIX)
+        file_name = "passwd_test"
+        self.passwd_test_file_dir = files_dir
+        text = '78f40f2c57eee727a4be179049cecf89'
+        filehandle = open(files_dir + "/" + file_name, 'w')
+        if filehandle:
+            filehandle.write(text)
+            filehandle.close()
+            self.passwd_test_file_name = files_dir + "/" + file_name
+
+    def delete_pass_test_file(self):
+        if self.passwd_test_file_name:
+            files_dir = self.passwd_test_file_dir
+            shutil.rmtree(files_dir)
+            self.passwd_test_file_name = None
+            self.passwd_test_file_dir = None
+
+    def test_get_pass_from_file(self):
+        pfile = self.passwd_test_file_name
+        passwd = crypt.AESCipher._get_pass_from_file(pfile)
+        self.assertEqual(passwd, '78f40f2c57eee727a4be179049cecf89')
+
+    @unittest.skipIf(sys.version_info.major == 3,
+                     'Not supported on python v 3.x')
+    def test_derive_key_and_iv(self):
+        passwd = 'ababab'
+        salt = 'a'
+        ret1, ret2 = crypt.AESCipher._derive_key_and_iv(password=passwd,
+                                                        salt=salt,
+                                                        key_length=10,
+                                                        iv_length=5)
+        expect1 = '\xb3J5\xce\xd4b\x87\xce\xe0:'
+        expect2 = '\x93\xc9\x9d\x03\x00'
+        self.assertEqual(ret1, expect1)
+        self.assertEqual(ret2, expect2)