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diff --git a/lib/Crypto/SelfTest/Cipher/test_DES3.py b/lib/Crypto/SelfTest/Cipher/test_DES3.py
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+# -*- coding: utf-8 -*-
+#
+#  SelfTest/Cipher/DES3.py: Self-test for the Triple-DES cipher
+#
+# Written in 2008 by Dwayne C. Litzenberger <dlitz@dlitz.net>
+#
+# ===================================================================
+# The contents of this file are dedicated to the public domain.  To
+# the extent that dedication to the public domain is not available,
+# everyone is granted a worldwide, perpetual, royalty-free,
+# non-exclusive license to exercise all rights associated with the
+# contents of this file for any purpose whatsoever.
+# No rights are reserved.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+# ===================================================================
+
+"""Self-test suite for Crypto.Cipher.DES3"""
+
+import unittest
+from binascii import hexlify, unhexlify
+
+from Crypto.Cipher import DES3
+
+from Crypto.Util.strxor import strxor_c
+from Crypto.Util.py3compat import bchr, tostr
+from Crypto.SelfTest.loader import load_test_vectors
+from Crypto.SelfTest.st_common import list_test_cases
+
+# This is a list of (plaintext, ciphertext, key, description) tuples.
+test_data = [
+    # Test vector from Appendix B of NIST SP 800-67
+    # "Recommendation for the Triple Data Encryption Algorithm (TDEA) Block
+    # Cipher"
+    # http://csrc.nist.gov/publications/nistpubs/800-67/SP800-67.pdf
+    ('54686520717566636b2062726f776e20666f78206a756d70',
+        'a826fd8ce53b855fcce21c8112256fe668d5c05dd9b6b900',
+        '0123456789abcdef23456789abcdef01456789abcdef0123',
+        'NIST SP800-67 B.1'),
+
+    # This test is designed to test the DES3 API, not the correctness of the
+    # output.
+    ('21e81b7ade88a259', '5c577d4d9b20c0f8',
+        '9b397ebf81b1181e282f4bb8adbadc6b', 'Two-key 3DES'),
+]
+
+# NIST CAVP test vectors
+
+nist_tdes_mmt_files = ("TECBMMT2.rsp", "TECBMMT3.rsp")
+
+for tdes_file in nist_tdes_mmt_files:
+
+    test_vectors = load_test_vectors(
+                        ("Cipher", "TDES"),
+                        tdes_file,
+                        "TDES ECB (%s)" % tdes_file,
+                        {"count": lambda x: int(x)}) or []
+
+    for index, tv in enumerate(test_vectors):
+
+        # The test vector file contains some directive lines
+        if isinstance(tv, str):
+            continue
+
+        key = tv.key1 + tv.key2 + tv.key3
+        test_data_item = (tostr(hexlify(tv.plaintext)),
+                          tostr(hexlify(tv.ciphertext)),
+                          tostr(hexlify(key)),
+                          "%s (%s)" % (tdes_file, index))
+        test_data.append(test_data_item)
+
+
+class CheckParity(unittest.TestCase):
+
+    def test_parity_option2(self):
+        before_2k = unhexlify("CABF326FA56734324FFCCABCDEFACABF")
+        after_2k = DES3.adjust_key_parity(before_2k)
+        self.assertEqual(after_2k,
+                         unhexlify("CBBF326EA46734324FFDCBBCDFFBCBBF"))
+
+    def test_parity_option3(self):
+        before_3k = unhexlify("AAAAAAAAAAAAAAAABBBBBBBBBBBBBBBBCCCCCCCCCCCCCCCC")
+        after_3k = DES3.adjust_key_parity(before_3k)
+        self.assertEqual(after_3k,
+                         unhexlify("ABABABABABABABABBABABABABABABABACDCDCDCDCDCDCDCD"))
+
+    def test_degradation(self):
+        sub_key1 = bchr(1) * 8
+        sub_key2 = bchr(255) * 8
+
+        # K1 == K2
+        self.assertRaises(ValueError, DES3.adjust_key_parity,
+                          sub_key1 * 2 + sub_key2)
+
+        # K2 == K3
+        self.assertRaises(ValueError, DES3.adjust_key_parity,
+                          sub_key1 + sub_key2 * 2)
+
+        # K1 == K2 == K3
+        self.assertRaises(ValueError, DES3.adjust_key_parity,
+                          sub_key1 * 3)
+
+        # K1 == K2 (with different parity)
+        self.assertRaises(ValueError, DES3.adjust_key_parity,
+                          sub_key1 + strxor_c(sub_key1, 1) + sub_key2)
+
+
+class DegenerateToDESTest(unittest.TestCase):
+
+    def runTest(self):
+        sub_key1 = bchr(1) * 8
+        sub_key2 = bchr(255) * 8
+
+        # K1 == K2
+        self.assertRaises(ValueError, DES3.new,
+                          sub_key1 * 2 + sub_key2,
+                          DES3.MODE_ECB)
+
+        # K2 == K3
+        self.assertRaises(ValueError, DES3.new,
+                          sub_key1 + sub_key2 * 2,
+                          DES3.MODE_ECB)
+
+        # K1 == K2 == K3
+        self.assertRaises(ValueError, DES3.new,
+                          sub_key1 * 3,
+                          DES3.MODE_ECB)
+
+        # K2 == K3 (parity is ignored)
+        self.assertRaises(ValueError, DES3.new,
+                          sub_key1 + sub_key2 + strxor_c(sub_key2, 0x1),
+                          DES3.MODE_ECB)
+
+
+class TestOutput(unittest.TestCase):
+
+    def runTest(self):
+        # Encrypt/Decrypt data and test output parameter
+
+        cipher = DES3.new(b'4'*8 + b'G'*8 + b'T'*8, DES3.MODE_ECB)
+
+        pt = b'5' * 16
+        ct = cipher.encrypt(pt)
+
+        output = bytearray(16)
+        res = cipher.encrypt(pt, output=output)
+        self.assertEqual(ct, output)
+        self.assertEqual(res, None)
+
+        res = cipher.decrypt(ct, output=output)
+        self.assertEqual(pt, output)
+        self.assertEqual(res, None)
+
+        output = memoryview(bytearray(16))
+        cipher.encrypt(pt, output=output)
+        self.assertEqual(ct, output)
+
+        cipher.decrypt(ct, output=output)
+        self.assertEqual(pt, output)
+
+        self.assertRaises(TypeError, cipher.encrypt, pt, output=b'0'*16)
+        self.assertRaises(TypeError, cipher.decrypt, ct, output=b'0'*16)
+
+        shorter_output = bytearray(7)
+        self.assertRaises(ValueError, cipher.encrypt, pt, output=shorter_output)
+        self.assertRaises(ValueError, cipher.decrypt, ct, output=shorter_output)
+
+
+def get_tests(config={}):
+    from .common import make_block_tests
+
+    tests = []
+    tests = make_block_tests(DES3, "DES3", test_data)
+    tests.append(DegenerateToDESTest())
+    tests += list_test_cases(CheckParity)
+    tests += [TestOutput()]
+    return tests
+
+
+if __name__ == '__main__':
+    import unittest
+
+    def suite():
+        unittest.TestSuite(get_tests())
+
+    unittest.main(defaultTest='suite')
+
+# vim:set ts=4 sw=4 sts=4 expandtab: