Merge branch 'devel-0.4.1' of github.com:etingof/pyasn1 into devel-0.4.1

15 files changed, 581 insertions, 120 deletions

diff --git a/.gitignore b/.gitignore
index 9dc2cf5..77f208c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
+# Python stuff
 *.pyc
 __pycache__
 
@@ -8,7 +9,17 @@ __pycache__
 MANIFEST
 dist/
 build/
-pyasn1.egg-info/
-venv
-venv2
-venv3
+*.egg-info/
+
+# PyCharm stuff
+.idea/
+
+# Sphinx template
+docs/source/.templates/layout.html
+
+# Eclipse stuff
+.project
+.pydevproject
+
+# Virtual envs
+venv*
diff --git a/.travis.yml b/.travis.yml
index 1c63221..d87a749 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -13,7 +13,8 @@ python:
   - "pypy3"
 install:
   - pip install codecov
-  - pip install --no-deps .
+  - pip install -r requirements.txt -r devel-requirements.txt
+  - pip install -e .
 script:
   - PYTHONPATH=.:$PYTHONPATH python tests/__main__.py
 after_success:
diff --git a/CHANGES.rst b/CHANGES.rst
index 8d11616..0a71810 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -22,6 +22,7 @@ Revision 0.4.1, released XX-10-2017
   opposed to constructed class).
 - Fixed CER/DER encoders to respect tagged CHOICE when ordering
   SET components
+- Fixed ASN.1 types not to interfere with the Pickle protocol
 
 Revision 0.3.7, released 04-10-2017
 -----------------------------------
diff --git a/MANIFEST.in b/MANIFEST.in
index b01e357..c605b0e 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,5 +1,5 @@
 include *.rst *.md
 recursive-include tests *.py
-recursive-include docs Makefile *.rst conf.py
-prune doc/build
-prune doc/source/.templates
\ No newline at end of file
+recursive-include docs Makefile *.rst *.svg conf.py
+prune docs/build
+prune docs/source/.templates
diff --git a/docs/source/.static/favicon.ico b/docs/source/.static/favicon.ico
new file mode 100644
index 0000000..87528bb
--- /dev/null
+++ b/docs/source/.static/favicon.ico
diff --git a/docs/source/.static/logo.svg b/docs/source/.static/logo.svg
new file mode 100644
index 0000000..e6062aa
--- /dev/null
+++ b/docs/source/.static/logo.svg
@@ -0,0 +1,95 @@
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+  <path transform="matrix(1.8213 0 0 1.7505 -239.14 -356.63)" d="m317.86 382.77c0 3.7423-12.687 6.776-28.336 6.776s-28.336-3.0337-28.336-6.776 12.687-6.776 28.336-6.776 28.336 3.0337 28.336 6.776z" fill="#135f9b" opacity=".68199"/>
+ </g>
+</svg>
diff --git a/docs/source/conf.py b/docs/source/conf.py
index 20b4443..488f7c8 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -12,8 +12,6 @@
 # All configuration values have a default; values that are commented out
 # serve to show the default.
 
-import os
-
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.
@@ -30,9 +28,7 @@ import os
 extensions = [
     'sphinx.ext.autodoc',
     'sphinx.ext.napoleon',
-    'sphinx.ext.doctest',
     'sphinx.ext.intersphinx',
-    'sphinx.ext.todo'
 ]
 
 # Add any paths that contain templates here, relative to this directory.
@@ -50,8 +46,7 @@ source_suffix = '.rst'
 master_doc = 'contents'
 
 # General information about the project.
-project = u'PyASN1'
-# noinspection PyShadowingBuiltins
+project = u'ASN.1 types and codecs'
 copyright = u'2005-2017, Ilya Etingof <etingof@gmail.com>'
 author = u'Ilya Etingof <etingof@gmail.com>'
 
@@ -60,9 +55,9 @@ author = u'Ilya Etingof <etingof@gmail.com>'
 # built documents.
 #
 # The short X.Y version.
-version = '0.3'
+version = '0.4'
 # The full version, including alpha/beta/rc tags.
-release = '0.3.1'
+release = '0.4'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
@@ -106,7 +101,7 @@ pygments_style = 'sphinx'
 # keep_warnings = False
 
 # If true, `todo` and `todoList` produce output, else they produce nothing.
-todo_include_todos = True
+todo_include_todos = False
 
 # -- Options for HTML output ----------------------------------------------
 
@@ -118,20 +113,30 @@ html_theme = 'alabaster'
 # further.  For a list of options available for each theme, see the
 # documentation.
 html_theme_options = {
-    'description': 'ASN.1 types and codecs',
+    'logo': 'logo.svg',
+    'description': '<p align=center><i>Brewing free software</i></p>',
     'show_powered_by': False,
     'github_user': 'etingof',
     'github_repo': 'pyasn1',
     'fixed_sidebar': True,
 }
 
+html_sidebars = {
+    '**': [
+        'about.html',
+        'navigation.html',
+        'relations.html',
+        'searchbox.html',
+        'donate.html',
+    ]
+}
+
 # Add any paths that contain custom themes here, relative to this directory.
 # html_theme_path = []
 
 # The name for this set of Sphinx documents.  If None, it defaults to
 # "<project> v<release> documentation".
 # html_title = None
-html_title = "PyASN1"
 
 # A shorter title for the navigation bar.  Default is the same as html_title.
 # html_short_title = None
@@ -143,17 +148,12 @@ html_title = "PyASN1"
 # The name of an image file (within the static path) to use as favicon of the
 # docs.  This file should be a Windows icon file (.ico) being 16x16 or 32x32
 # pixels large.
-# html_favicon = None
+html_favicon = '.static/favicon.ico'
 
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,
 # so a file named "default.css" will overwrite the builtin "default.css".
-# if 'PYASN1DEV' in os.environ:
-#     html_static_path = ['.static']
-#
-# # Custom CSS theme
-# if 'PYASN1DEV' in os.environ:
-#     html_style = 'css/rtdimproved.css'
+html_static_path = ['.static']
 
 # Add any extra paths that contain custom files (such as robots.txt or
 # .htaccess) here, relative to this directory. These files are copied
@@ -324,5 +324,3 @@ napoleon_use_admonition_for_references = False
 napoleon_use_ivar = False
 napoleon_use_param = False
 napoleon_use_rtype = False
-
-# Alabaster theme
\ No newline at end of file
diff --git a/docs/source/contents.rst b/docs/source/contents.rst
index f2955a1..c4582bd 100644
--- a/docs/source/contents.rst
+++ b/docs/source/contents.rst
@@ -3,7 +3,7 @@ ASN.1 library for Python
 ========================
 
 .. toctree::
-   :maxdepth: 3
+   :maxdepth: 1
 
 Abstract Syntax Notation One (`ASN.1
 <http://en.wikipedia.org/wiki/Abstract_Syntax_Notation_1x>`_) is a
@@ -82,68 +82,29 @@ and oftentimes fell victim to its edge cases.
 On the bright side, ASN.1 has been around for a long time, it is well understood
 and security reviewed.
 
-Library documentation
----------------------
-
-As of this moment, pyasn1 library implements all ASN.1 data
-types as Python objects in accordance with X.208 standard. Later,
-post-1995, revision (X.680) introduced some changes to the schema
-language which may not be fully supported by pyasn1. Aside from data
-types a collection of data transformation codecs comes with pyasn1 package.
-
-As for ASN.1 schema language, pyasn1 package does
-not ship any compiler for it. However, there's a tool called
-`asn1late <https://github.com/kimgr/asn1ate>`_ which is an ASN.1
-grammar parser paired to code generator capable of generating pyasn1
-code. So this is an alternative (or at least a good start) to manual
-implementation of pyasn1 classes from ASN.1 specification.
-
-Both `pyasn1 <https://github.com/etingof/pyasn1>`_ and
-`pyasn1-modules <https://github.com/etingof/pyasn1-modules>`_ libraries
-can be used out-of-the-box with Python versions 2.4 through 3.6.
-No external dependencies required.
+Documentation
+-------------
 
 .. toctree::
-   :maxdepth: 3
+   :maxdepth: 2
 
    /pyasn1/contents
 
 Use case
 --------
 
-   .. toctree::
-      :maxdepth: 3
+.. toctree::
+   :maxdepth: 2
 
-      /example-use-case
+   /example-use-case
 
 Download & Install
 ------------------
 
-The PyASN1 software is provided under terms and conditions of BSD-style
-:ref:`license`, and can be freely downloaded from `Github <https://github.com/etingof/pyasn1>`_
-or `PyPI <http://pypi.python.org/pypi/pyasn1/>`_.
-
-It is pure-Python and has no dependencies. Considering how much industrial or finance
-software can be stuck with an old platform (think RHEL 5), we struggle to maintain its
-compatibility back to the very pre-historic Python (which is 2.4!).
-
-The best way to obtain PyASN1 is by running `pip`:
-
-.. code-block:: bash
-
-   $ pip install pyasn1
-
-or
-
-.. code-block:: bash
-
-   $ easy_install pyasn1
-
-You may also want to use `pyasn1-modules`:
-
-.. code-block:: bash
+.. toctree::
+   :maxdepth: 2
 
-   $ pip install pyasn1-modules
+   /download
 
 Changes
 -------
@@ -152,10 +113,20 @@ All changes and release history is maintained in changelog.  There you
 could also download the latest unreleased pyasn1 tarball containing
 the latest fixes and improvements.
 
-   .. toctree::
-      :maxdepth: 1
+.. toctree::
+   :maxdepth: 1
+
+   /changelog
+
+License
+-------
+
+The PyASN1 software is distributed under 2-clause BSD License.
+
+.. toctree::
+   :maxdepth: 2
 
-      /changelog
+   /license
 
 Getting help
 ------------
diff --git a/docs/source/download.rst b/docs/source/download.rst
new file mode 100644
index 0000000..cf78126
--- /dev/null
+++ b/docs/source/download.rst
@@ -0,0 +1,27 @@
+
+Download & Install
+==================
+
+The *pyasn1* library is a pure-Python package with no external
+dependencies. Considering how much industrial or finance software
+can be stuck with an old platform (think RHEL 5), we struggle to
+maintain its compatibility back to the very pre-historic Python
+(which is 2.4!).
+
+The best way to obtain PyASN1 is by running `pip`:
+
+.. code-block:: bash
+
+   $ virtualenv venv
+   $ source venv/bin/activate
+   $ pip install pyasn1
+
+You may also want to use `pyasn1-modules`:
+
+.. code-block:: bash
+
+   $ pip install pyasn1-modules
+
+Alternatively, you can download the latest release from
+`GitHub <https://github.com/etingof/pyasn1/releases>`_
+or `PyPI <https://pypi.python.org/pypi/pyasn1>`_.
diff --git a/docs/source/pyasn1/contents.rst b/docs/source/pyasn1/contents.rst
index 1dc9e58..57ba4b2 100644
--- a/docs/source/pyasn1/contents.rst
+++ b/docs/source/pyasn1/contents.rst
@@ -1,6 +1,30 @@
 
 .. _pyasn1:
 
+Library documentation
+=====================
+
+As of this moment, pyasn1 library implements all ASN.1 data
+types as Python objects in accordance with X.208 standard. Later,
+post-1995, revision (X.680) introduced some changes to the schema
+language which may not be fully supported by pyasn1. Aside from data
+types a collection of data transformation codecs comes with the
+pyasn1 package.
+
+As for ASN.1 schema language, pyasn1 package does
+not ship any compiler for it. However, there's a tool called
+`asn1late <https://github.com/kimgr/asn1ate>`_ which is an ASN.1
+grammar parser paired to code generator capable of generating pyasn1
+code. So this is an alternative (or at least a good start) to manual
+implementation of pyasn1 classes from ASN.1 specification.
+
+Both `pyasn1 <https://github.com/etingof/pyasn1>`_ and
+`pyasn1-modules <https://github.com/etingof/pyasn1-modules>`_ libraries
+can be used out-of-the-box with Python versions 2.4 through 3.6.
+No external dependencies required.
+
+.. _pyasn1-types:
+
 ASN.1 types
 -----------
 
@@ -136,6 +160,8 @@ its :ref:`fields <type.namedtype>` specification.
    /pyasn1/type/opentype/contents
    /pyasn1/type/namedval/contents
 
+.. _pyasn1-codecs:
+
 Serialisation codecs
 --------------------
 
diff --git a/pyasn1/type/base.py b/pyasn1/type/base.py
index ec323b2..a20eff4 100644
--- a/pyasn1/type/base.py
+++ b/pyasn1/type/base.py
@@ -155,9 +155,31 @@ class NoValue(object):
     Any operation attempted on the *noValue* object will raise the
     *PyAsn1Error* exception.
     """
-    skipMethods = ('__getattribute__', '__getattr__', '__setattr__', '__delattr__',
-                   '__class__', '__init__', '__del__', '__new__', '__repr__',
-                   '__qualname__', '__objclass__', 'im_class', '__sizeof__')
+    skipMethods = set(
+        ('__slots__',
+         # attributes
+         '__getattribute__',
+         '__getattr__',
+         '__setattr__',
+         '__delattr__',
+         # class instance
+         '__class__',
+         '__init__',
+         '__del__',
+         '__new__',
+         '__repr__',
+         '__qualname__',
+         '__objclass__',
+         'im_class',
+         '__sizeof__',
+         # pickle protocol
+         '__reduce__',
+         '__reduce_ex__',
+         '__getnewargs__',
+         '__getinitargs__',
+         '__getstate__',
+         '__setstate__')
+    )
 
     _instance = None
 
diff --git a/pyasn1/type/univ.py b/pyasn1/type/univ.py
index 923f992..9d16b05 100644
--- a/pyasn1/type/univ.py
+++ b/pyasn1/type/univ.py
@@ -272,6 +272,26 @@ class Boolean(Integer):
     # Optimization for faster codec lookup
     typeId = Integer.getTypeId()
 
+if sys.version_info[0] < 3:
+    SizedIntegerBase = long
+else:
+    SizedIntegerBase = int
+
+
+class SizedInteger(SizedIntegerBase):
+    bitLength = leadingZeroBits = None
+
+    def setBitLength(self, bitLength):
+        self.bitLength = bitLength
+        self.leadingZeroBits = max(bitLength - integer.bitLength(self), 0)
+        return self
+
+    def __len__(self):
+        if self.bitLength is None:
+            self.setBitLength(integer.bitLength(self))
+
+        return self.bitLength
+
 
 class BitString(base.AbstractSimpleAsn1Item):
     """Create |ASN.1| schema or value object.
@@ -328,25 +348,6 @@ class BitString(base.AbstractSimpleAsn1Item):
 
     defaultBinValue = defaultHexValue = noValue
 
-    if sys.version_info[0] < 3:
-        SizedIntegerBase = long
-    else:
-        SizedIntegerBase = int
-
-    class SizedInteger(SizedIntegerBase):
-        bitLength = leadingZeroBits = None
-
-        def setBitLength(self, bitLength):
-            self.bitLength = bitLength
-            self.leadingZeroBits = max(bitLength - integer.bitLength(self), 0)
-            return self
-
-        def __len__(self):
-            if self.bitLength is None:
-                self.setBitLength(integer.bitLength(self))
-
-            return self.bitLength
-
     def __init__(self, value=noValue, **kwargs):
         if value is noValue:
             if kwargs:
@@ -428,11 +429,11 @@ class BitString(base.AbstractSimpleAsn1Item):
 
     def __add__(self, value):
         value = self.prettyIn(value)
-        return self.clone(self.SizedInteger(self._value << len(value) | value).setBitLength(len(self._value) + len(value)))
+        return self.clone(SizedInteger(self._value << len(value) | value).setBitLength(len(self._value) + len(value)))
 
     def __radd__(self, value):
         value = self.prettyIn(value)
-        return self.clone(self.SizedInteger(value << len(self._value) | self._value).setBitLength(len(self._value) + len(value)))
+        return self.clone(SizedInteger(value << len(self._value) | self._value).setBitLength(len(self._value) + len(value)))
 
     def __mul__(self, value):
         bitString = self._value
@@ -446,10 +447,10 @@ class BitString(base.AbstractSimpleAsn1Item):
         return self * value
 
     def __lshift__(self, count):
-        return self.clone(self.SizedInteger(self._value << count).setBitLength(len(self._value) + count))
+        return self.clone(SizedInteger(self._value << count).setBitLength(len(self._value) + count))
 
     def __rshift__(self, count):
-        return self.clone(self.SizedInteger(self._value >> count).setBitLength(max(0, len(self._value) - count)))
+        return self.clone(SizedInteger(self._value >> count).setBitLength(max(0, len(self._value) - count)))
 
     def __int__(self):
         return self._value
@@ -498,14 +499,14 @@ class BitString(base.AbstractSimpleAsn1Item):
             Text string like 'DEADBEEF'
         """
         try:
-            value = cls.SizedInteger(value, 16).setBitLength(len(value) * 4)
+            value = SizedInteger(value, 16).setBitLength(len(value) * 4)
 
         except ValueError:
             raise error.PyAsn1Error('%s.fromHexString() error: %s' % (cls.__name__, sys.exc_info()[1]))
 
         if prepend is not None:
-            value = cls.SizedInteger(
-                (cls.SizedInteger(prepend) << len(value)) | value
+            value = SizedInteger(
+                (SizedInteger(prepend) << len(value)) | value
             ).setBitLength(len(prepend) + len(value))
 
         if not internalFormat:
@@ -523,14 +524,14 @@ class BitString(base.AbstractSimpleAsn1Item):
             Text string like '1010111'
         """
         try:
-            value = cls.SizedInteger(value or '0', 2).setBitLength(len(value))
+            value = SizedInteger(value or '0', 2).setBitLength(len(value))
 
         except ValueError:
             raise error.PyAsn1Error('%s.fromBinaryString() error: %s' % (cls.__name__, sys.exc_info()[1]))
 
         if prepend is not None:
-            value = cls.SizedInteger(
-                (cls.SizedInteger(prepend) << len(value)) | value
+            value = SizedInteger(
+                (SizedInteger(prepend) << len(value)) | value
             ).setBitLength(len(prepend) + len(value))
 
         if not internalFormat:
@@ -547,11 +548,11 @@ class BitString(base.AbstractSimpleAsn1Item):
         value: :class:`str` (Py2) or :class:`bytes` (Py3)
             Text string like '\\\\x01\\\\xff' (Py2) or b'\\\\x01\\\\xff' (Py3)
         """
-        value = cls.SizedInteger(integer.from_bytes(value) >> padding).setBitLength(len(value) * 8 - padding)
+        value = SizedInteger(integer.from_bytes(value) >> padding).setBitLength(len(value) * 8 - padding)
 
         if prepend is not None:
-            value = cls.SizedInteger(
-                (cls.SizedInteger(prepend) << len(value)) | value
+            value = SizedInteger(
+                (SizedInteger(prepend) << len(value)) | value
             ).setBitLength(len(prepend) + len(value))
 
         if not internalFormat:
@@ -560,11 +561,11 @@ class BitString(base.AbstractSimpleAsn1Item):
         return value
 
     def prettyIn(self, value):
-        if isinstance(value, self.SizedInteger):
+        if isinstance(value, SizedInteger):
             return value
         elif octets.isStringType(value):
             if not value:
-                return self.SizedInteger(0).setBitLength(0)
+                return SizedInteger(0).setBitLength(0)
 
             elif value[0] == '\'':  # "'1011'B" -- ASN.1 schema representation (deprecated)
                 if value[-2:] == '\'B':
@@ -592,7 +593,7 @@ class BitString(base.AbstractSimpleAsn1Item):
                 for bitPosition in bitPositions:
                     number |= 1 << (rightmostPosition - bitPosition)
 
-                return self.SizedInteger(number).setBitLength(rightmostPosition + 1)
+                return SizedInteger(number).setBitLength(rightmostPosition + 1)
 
             elif value.startswith('0x'):
                 return self.fromHexString(value[2:], internalFormat=True)
@@ -607,10 +608,10 @@ class BitString(base.AbstractSimpleAsn1Item):
             return self.fromBinaryString(''.join([b and '1' or '0' for b in value]), internalFormat=True)
 
         elif isinstance(value, BitString):
-            return self.SizedInteger(value).setBitLength(len(value))
+            return SizedInteger(value).setBitLength(len(value))
 
         elif isinstance(value, intTypes):
-            return self.SizedInteger(value)
+            return SizedInteger(value)
 
         else:
             raise error.PyAsn1Error(
diff --git a/tests/type/test_char.py b/tests/type/test_char.py
index 74550c0..1301a50 100644
--- a/tests/type/test_char.py
+++ b/tests/type/test_char.py
@@ -5,6 +5,7 @@
 # License: http://pyasn1.sf.net/license.html
 #
 import sys
+import pickle
 
 try:
     import unittest2 as unittest
@@ -111,6 +112,21 @@ class AbstractStringTestCase(object):
         def testReverse(self):
             assert list(reversed(self.asn1String)) == list(reversed(self.pythonString))
 
+    def testSchemaPickling(self):
+        old_asn1 = self.asn1Type()
+        serialized = pickle.dumps(old_asn1)
+        assert serialized
+        new_asn1 = pickle.loads(serialized)
+        assert type(new_asn1) == self.asn1Type
+        assert old_asn1.isSameTypeWith(new_asn1)
+
+    def testValuePickling(self):
+        old_asn1 = self.asn1String
+        serialized = pickle.dumps(old_asn1)
+        assert serialized
+        new_asn1 = pickle.loads(serialized)
+        assert new_asn1 == self.asn1String
+
 
 class VisibleStringTestCase(AbstractStringTestCase, BaseTestCase):
 
diff --git a/tests/type/test_univ.py b/tests/type/test_univ.py
index 166af44..36a3fd4 100644
--- a/tests/type/test_univ.py
+++ b/tests/type/test_univ.py
@@ -6,6 +6,7 @@
 #
 import sys
 import math
+import pickle
 
 try:
     import unittest2 as unittest
@@ -296,6 +297,24 @@ class IntegerTestCase(BaseTestCase):
         )
 
 
+class IntegerPicklingTestCase(unittest.TestCase):
+
+    def testSchemaPickling(self):
+        old_asn1 = univ.Integer()
+        serialized = pickle.dumps(old_asn1)
+        assert serialized
+        new_asn1 = pickle.loads(serialized)
+        assert type(new_asn1) == univ.Integer
+        assert old_asn1.isSameTypeWith(new_asn1)
+
+    def testValuePickling(self):
+        old_asn1 = univ.Integer(-123)
+        serialized = pickle.dumps(old_asn1)
+        assert serialized
+        new_asn1 = pickle.loads(serialized)
+        assert new_asn1 == -123
+
+
 class BooleanTestCase(BaseTestCase):
     def testTruth(self):
         assert univ.Boolean(True) and univ.Boolean(1), 'Truth initializer fails'
@@ -328,6 +347,24 @@ class BooleanTestCase(BaseTestCase):
             assert 0, 'constraint fail'
 
 
+class BooleanPicklingTestCase(unittest.TestCase):
+
+    def testSchemaPickling(self):
+        old_asn1 = univ.Boolean()
+        serialized = pickle.dumps(old_asn1)
+        assert serialized
+        new_asn1 = pickle.loads(serialized)
+        assert type(new_asn1) == univ.Boolean
+        assert old_asn1.isSameTypeWith(new_asn1)
+
+    def testValuePickling(self):
+        old_asn1 = univ.Boolean(True)
+        serialized = pickle.dumps(old_asn1)
+        assert serialized
+        new_asn1 = pickle.loads(serialized)
+        assert new_asn1 == True
+
+
 class BitStringTestCase(BaseTestCase):
     def setUp(self):
         BaseTestCase.setUp(self)
@@ -407,6 +444,24 @@ class BitStringTestCase(BaseTestCase):
         assert BitString('11000000011001').asInteger() == 12313
 
 
+class BitStringPicklingTestCase(unittest.TestCase):
+
+    def testSchemaPickling(self):
+        old_asn1 = univ.BitString()
+        serialized = pickle.dumps(old_asn1)
+        assert serialized
+        new_asn1 = pickle.loads(serialized)
+        assert type(new_asn1) == univ.BitString
+        assert old_asn1.isSameTypeWith(new_asn1)
+
+    def testValuePickling(self):
+        old_asn1 = univ.BitString((1, 0, 1, 0))
+        serialized = pickle.dumps(old_asn1)
+        assert serialized
+        new_asn1 = pickle.loads(serialized)
+        assert new_asn1 == (1, 0, 1, 0)
+
+
 class OctetStringWithUnicodeMixIn(object):
 
     initializer = ()
@@ -545,6 +600,24 @@ class OctetStringTestCase(BaseTestCase):
         assert OctetString(hexValue="FA9823C43E43510DE3422") == ints2octs((250, 152, 35, 196, 62, 67, 81, 13, 227, 66, 32))
 
 
+class OctetStringPicklingTestCase(unittest.TestCase):
+
+    def testSchemaPickling(self):
+        old_asn1 = univ.BitString()
+        serialized = pickle.dumps(old_asn1)
+        assert serialized
+        new_asn1 = pickle.loads(serialized)
+        assert type(new_asn1) == univ.BitString
+        assert old_asn1.isSameTypeWith(new_asn1)
+
+    def testValuePickling(self):
+        old_asn1 = univ.BitString((1, 0, 1, 0))
+        serialized = pickle.dumps(old_asn1)
+        assert serialized
+        new_asn1 = pickle.loads(serialized)
+        assert new_asn1 == (1, 0, 1, 0)
+
+
 class Null(BaseTestCase):
 
     def testInit(self):
@@ -594,6 +667,24 @@ class Null(BaseTestCase):
         assert not Null('')
 
 
+class NullPicklingTestCase(unittest.TestCase):
+
+    def testSchemaPickling(self):
+        old_asn1 = univ.Null()
+        serialized = pickle.dumps(old_asn1)
+        assert serialized
+        new_asn1 = pickle.loads(serialized)
+        assert type(new_asn1) == univ.Null
+        assert old_asn1.isSameTypeWith(new_asn1)
+
+    def testValuePickling(self):
+        old_asn1 = univ.Null('')
+        serialized = pickle.dumps(old_asn1)
+        assert serialized
+        new_asn1 = pickle.loads(serialized)
+        assert not new_asn1
+
+
 class RealTestCase(BaseTestCase):
     def testFloat4BinEnc(self):
         assert univ.Real((0.25, 2, 3)) == 2.0, 'float initializer for binary encoding fails'
@@ -727,6 +818,24 @@ class RealTestCase(BaseTestCase):
         assert Real(1.0) == 1.0
 
 
+class RealPicklingTestCase(unittest.TestCase):
+
+    def testSchemaPickling(self):
+        old_asn1 = univ.Real()
+        serialized = pickle.dumps(old_asn1)
+        assert serialized
+        new_asn1 = pickle.loads(serialized)
+        assert type(new_asn1) == univ.Real
+        assert old_asn1.isSameTypeWith(new_asn1)
+
+    def testValuePickling(self):
+        old_asn1 = univ.Real((1, 10, 3))
+        serialized = pickle.dumps(old_asn1)
+        assert serialized
+        new_asn1 = pickle.loads(serialized)
+        assert new_asn1 == 1000
+
+
 class ObjectIdentifier(BaseTestCase):
     def testStr(self):
         assert str(univ.ObjectIdentifier((1, 3, 6))) == '1.3.6', 'str() fails'
@@ -787,6 +896,24 @@ class ObjectIdentifier(BaseTestCase):
         assert str(ObjectIdentifier((1, 3, 6))) == '1.3.6'
 
 
+class ObjectIdentifierPicklingTestCase(unittest.TestCase):
+
+    def testSchemaPickling(self):
+        old_asn1 = univ.ObjectIdentifier()
+        serialized = pickle.dumps(old_asn1)
+        assert serialized
+        new_asn1 = pickle.loads(serialized)
+        assert type(new_asn1) == univ.ObjectIdentifier
+        assert old_asn1.isSameTypeWith(new_asn1)
+
+    def testValuePickling(self):
+        old_asn1 = univ.ObjectIdentifier('2.3.1.1.2')
+        serialized = pickle.dumps(old_asn1)
+        assert serialized
+        new_asn1 = pickle.loads(serialized)
+        assert new_asn1 == (2, 3, 1, 1, 2)
+
+
 class SequenceOf(BaseTestCase):
     def setUp(self):
         BaseTestCase.setUp(self)
@@ -1027,6 +1154,26 @@ class SequenceOf(BaseTestCase):
         assert s.getComponentByPosition(0, instantiate=False) is univ.noValue
 
 
+class SequenceOfPicklingTestCase(unittest.TestCase):
+
+    def testSchemaPickling(self):
+        old_asn1 = univ.SequenceOf(componentType=univ.OctetString())
+        serialized = pickle.dumps(old_asn1)
+        assert serialized
+        new_asn1 = pickle.loads(serialized)
+        assert type(new_asn1) == univ.SequenceOf
+        assert old_asn1.isSameTypeWith(new_asn1)
+
+    def testValuePickling(self):
+        old_asn1 = univ.SequenceOf(componentType=univ.OctetString())
+        old_asn1[0] = 'test'
+        serialized = pickle.dumps(old_asn1)
+        assert serialized
+        new_asn1 = pickle.loads(serialized)
+        assert new_asn1
+        assert new_asn1 == [str2octs('test')]
+
+
 class Sequence(BaseTestCase):
     def setUp(self):
         BaseTestCase.setUp(self)
@@ -1329,6 +1476,34 @@ class SequenceWithoutSchema(BaseTestCase):
         assert 'field-0' not in s
 
 
+class SequencePicklingTestCase(unittest.TestCase):
+
+    def testSchemaPickling(self):
+        old_asn1 = univ.Sequence(
+            componentType=namedtype.NamedTypes(
+                namedtype.NamedType('name', univ.OctetString())
+            )
+        )
+        serialized = pickle.dumps(old_asn1)
+        assert serialized
+        new_asn1 = pickle.loads(serialized)
+        assert type(new_asn1) == univ.Sequence
+        assert old_asn1.isSameTypeWith(new_asn1)
+
+    def testValuePickling(self):
+        old_asn1 = univ.Sequence(
+            componentType=namedtype.NamedTypes(
+                namedtype.NamedType('name', univ.OctetString())
+            )
+        )
+        old_asn1['name'] = 'test'
+        serialized = pickle.dumps(old_asn1)
+        assert serialized
+        new_asn1 = pickle.loads(serialized)
+        assert new_asn1
+        assert new_asn1['name'] == str2octs('test')
+
+
 class SetOf(BaseTestCase):
     def setUp(self):
         BaseTestCase.setUp(self)
@@ -1357,6 +1532,27 @@ class SetOf(BaseTestCase):
         assert s == [str2octs('abc')]
 
 
+
+class SetOfPicklingTestCase(unittest.TestCase):
+
+    def testSchemaPickling(self):
+        old_asn1 = univ.SetOf(componentType=univ.OctetString())
+        serialized = pickle.dumps(old_asn1)
+        assert serialized
+        new_asn1 = pickle.loads(serialized)
+        assert type(new_asn1) == univ.SetOf
+        assert old_asn1.isSameTypeWith(new_asn1)
+
+    def testValuePickling(self):
+        old_asn1 = univ.SetOf(componentType=univ.OctetString())
+        old_asn1[0] = 'test'
+        serialized = pickle.dumps(old_asn1)
+        assert serialized
+        new_asn1 = pickle.loads(serialized)
+        assert new_asn1
+        assert new_asn1 == [str2octs('test')]
+
+
 class Set(BaseTestCase):
     def setUp(self):
         BaseTestCase.setUp(self)
@@ -1443,6 +1639,34 @@ class Set(BaseTestCase):
         assert s.getComponentByPosition(1, instantiate=False) is univ.noValue
 
 
+class SetPicklingTestCase(unittest.TestCase):
+
+    def testSchemaPickling(self):
+        old_asn1 = univ.Set(
+            componentType=namedtype.NamedTypes(
+                namedtype.NamedType('name', univ.OctetString())
+            )
+        )
+        serialized = pickle.dumps(old_asn1)
+        assert serialized
+        new_asn1 = pickle.loads(serialized)
+        assert type(new_asn1) == univ.Set
+        assert old_asn1.isSameTypeWith(new_asn1)
+
+    def testValuePickling(self):
+        old_asn1 = univ.Set(
+            componentType=namedtype.NamedTypes(
+                namedtype.NamedType('name', univ.OctetString())
+            )
+        )
+        old_asn1['name'] = 'test'
+        serialized = pickle.dumps(old_asn1)
+        assert serialized
+        new_asn1 = pickle.loads(serialized)
+        assert new_asn1
+        assert new_asn1['name'] == str2octs('test')
+
+
 class Choice(BaseTestCase):
     def setUp(self):
         BaseTestCase.setUp(self)
@@ -1590,6 +1814,36 @@ class Choice(BaseTestCase):
         assert s.getComponentByPosition(1, instantiate=False) is univ.noValue
 
 
+class ChoicePicklingTestCase(unittest.TestCase):
+
+    def testSchemaPickling(self):
+        old_asn1 = univ.Choice(
+            componentType=namedtype.NamedTypes(
+                namedtype.NamedType('name', univ.OctetString()),
+                namedtype.NamedType('id', univ.Integer())
+            )
+        )
+        serialized = pickle.dumps(old_asn1)
+        assert serialized
+        new_asn1 = pickle.loads(serialized)
+        assert type(new_asn1) == univ.Choice
+        assert old_asn1.isSameTypeWith(new_asn1)
+
+    def testValuePickling(self):
+        old_asn1 = univ.Choice(
+            componentType=namedtype.NamedTypes(
+                namedtype.NamedType('name', univ.OctetString()),
+                namedtype.NamedType('id', univ.Integer())
+            )
+        )
+        old_asn1['name'] = 'test'
+        serialized = pickle.dumps(old_asn1)
+        assert serialized
+        new_asn1 = pickle.loads(serialized)
+        assert new_asn1
+        assert new_asn1['name'] == str2octs('test')
+
+
 suite = unittest.TestLoader().loadTestsFromModule(sys.modules[__name__])
 
 if __name__ == '__main__':
diff --git a/tests/type/test_useful.py b/tests/type/test_useful.py
index 82a97d7..2af17ff 100644
--- a/tests/type/test_useful.py
+++ b/tests/type/test_useful.py
@@ -7,6 +7,7 @@
 import sys
 import datetime
 from copy import deepcopy
+import pickle
 
 try:
     import unittest2 as unittest
@@ -78,6 +79,24 @@ class GeneralizedTimeTestCase(BaseTestCase):
         assert dt == deepcopy(dt)
 
 
+class GeneralizedTimePicklingTestCase(unittest.TestCase):
+
+    def testSchemaPickling(self):
+        old_asn1 = useful.GeneralizedTime()
+        serialized = pickle.dumps(old_asn1)
+        assert serialized
+        new_asn1 = pickle.loads(serialized)
+        assert type(new_asn1) == useful.GeneralizedTime
+        assert old_asn1.isSameTypeWith(new_asn1)
+
+    def testValuePickling(self):
+        old_asn1 = useful.GeneralizedTime("20170916234254+0130")
+        serialized = pickle.dumps(old_asn1)
+        assert serialized
+        new_asn1 = pickle.loads(serialized)
+        assert new_asn1 == old_asn1
+
+
 class UTCTimeTestCase(BaseTestCase):
 
     def testFromDateTime(self):
@@ -98,6 +117,25 @@ class UTCTimeTestCase(BaseTestCase):
     def testToDateTime4(self):
         assert datetime.datetime(2017, 7, 11, 0, 1) == useful.UTCTime('1707110001').asDateTime
 
+
+class UTCTimePicklingTestCase(unittest.TestCase):
+
+    def testSchemaPickling(self):
+        old_asn1 = useful.UTCTime()
+        serialized = pickle.dumps(old_asn1)
+        assert serialized
+        new_asn1 = pickle.loads(serialized)
+        assert type(new_asn1) == useful.UTCTime
+        assert old_asn1.isSameTypeWith(new_asn1)
+
+    def testValuePickling(self):
+        old_asn1 = useful.UTCTime("170711000102")
+        serialized = pickle.dumps(old_asn1)
+        assert serialized
+        new_asn1 = pickle.loads(serialized)
+        assert new_asn1 == old_asn1
+
+
 suite = unittest.TestLoader().loadTestsFromModule(sys.modules[__name__])
 
 if __name__ == '__main__':