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diff --git a/lib/Crypto/SelfTest/Hash/test_cSHAKE.py b/lib/Crypto/SelfTest/Hash/test_cSHAKE.py
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+++ b/lib/Crypto/SelfTest/Hash/test_cSHAKE.py
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+# ===================================================================
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+# ===================================================================
+
+"""Self-test suite for Crypto.Hash.cSHAKE128 and cSHAKE256"""
+
+import unittest
+
+from Crypto.SelfTest.loader import load_test_vectors
+from Crypto.SelfTest.st_common import list_test_cases
+
+from Crypto.Hash import cSHAKE128, cSHAKE256, SHAKE128, SHAKE256
+from Crypto.Util.py3compat import b, bchr, tobytes
+
+
+class cSHAKETest(unittest.TestCase):
+
+    def test_left_encode(self):
+        from Crypto.Hash.cSHAKE128 import _left_encode
+        self.assertEqual(_left_encode(0), b'\x01\x00')
+        self.assertEqual(_left_encode(1), b'\x01\x01')
+        self.assertEqual(_left_encode(256), b'\x02\x01\x00')
+
+    def test_bytepad(self):
+        from Crypto.Hash.cSHAKE128 import _bytepad
+        self.assertEqual(_bytepad(b'', 4), b'\x01\x04\x00\x00')
+        self.assertEqual(_bytepad(b'A', 4), b'\x01\x04A\x00')
+        self.assertEqual(_bytepad(b'AA', 4), b'\x01\x04AA')
+        self.assertEqual(_bytepad(b'AAA', 4), b'\x01\x04AAA\x00\x00\x00')
+        self.assertEqual(_bytepad(b'AAAA', 4), b'\x01\x04AAAA\x00\x00')
+        self.assertEqual(_bytepad(b'AAAAA', 4), b'\x01\x04AAAAA\x00')
+        self.assertEqual(_bytepad(b'AAAAAA', 4), b'\x01\x04AAAAAA')
+        self.assertEqual(_bytepad(b'AAAAAAA', 4), b'\x01\x04AAAAAAA\x00\x00\x00')
+
+    def test_new_positive(self):
+
+        xof1 = self.cshake.new()
+        xof2 = self.cshake.new(data=b("90"))
+        xof3 = self.cshake.new().update(b("90"))
+
+        self.assertNotEqual(xof1.read(10), xof2.read(10))
+        xof3.read(10)
+        self.assertEqual(xof2.read(10), xof3.read(10))
+
+        xof1 = self.cshake.new()
+        ref = xof1.read(10)
+        xof2 = self.cshake.new(custom=b(""))
+        xof3 = self.cshake.new(custom=b("foo"))
+
+        self.assertEqual(ref, xof2.read(10))
+        self.assertNotEqual(ref, xof3.read(10))
+
+        xof1 = self.cshake.new(custom=b("foo"))
+        xof2 = self.cshake.new(custom=b("foo"), data=b("90"))
+        xof3 = self.cshake.new(custom=b("foo")).update(b("90"))
+
+        self.assertNotEqual(xof1.read(10), xof2.read(10))
+        xof3.read(10)
+        self.assertEqual(xof2.read(10), xof3.read(10))
+
+    def test_update(self):
+        pieces = [bchr(10) * 200, bchr(20) * 300]
+        h = self.cshake.new()
+        h.update(pieces[0]).update(pieces[1])
+        digest = h.read(10)
+        h = self.cshake.new()
+        h.update(pieces[0] + pieces[1])
+        self.assertEqual(h.read(10), digest)
+
+    def test_update_negative(self):
+        h = self.cshake.new()
+        self.assertRaises(TypeError, h.update, u"string")
+
+    def test_digest(self):
+        h = self.cshake.new()
+        digest = h.read(90)
+
+        # read returns a byte string of the right length
+        self.assertTrue(isinstance(digest, type(b("digest"))))
+        self.assertEqual(len(digest), 90)
+
+    def test_update_after_read(self):
+        mac = self.cshake.new()
+        mac.update(b("rrrr"))
+        mac.read(90)
+        self.assertRaises(TypeError, mac.update, b("ttt"))
+
+    def test_shake(self):
+        # When no customization string is passed, results must match SHAKE
+        for digest_len in range(64):
+            xof1 = self.cshake.new(b'TEST')
+            xof2 = self.shake.new(b'TEST')
+            self.assertEqual(xof1.read(digest_len), xof2.read(digest_len))
+
+
+class cSHAKE128Test(cSHAKETest):
+    cshake = cSHAKE128
+    shake = SHAKE128
+
+
+class cSHAKE256Test(cSHAKETest):
+    cshake = cSHAKE256
+    shake = SHAKE256
+
+
+class cSHAKEVectors(unittest.TestCase):
+    pass
+
+
+vector_files = [("ShortMsgSamples_cSHAKE128.txt", "Short Message Samples cSHAKE128", "128_cshake", cSHAKE128),
+                ("ShortMsgSamples_cSHAKE256.txt", "Short Message Samples cSHAKE256", "256_cshake", cSHAKE256),
+                ("CustomMsgSamples_cSHAKE128.txt", "Custom Message Samples cSHAKE128", "custom_128_cshake", cSHAKE128),
+                ("CustomMsgSamples_cSHAKE256.txt", "Custom Message Samples cSHAKE256", "custom_256_cshake", cSHAKE256),
+                ]
+
+for file, descr, tag, test_class in vector_files:
+
+    test_vectors = load_test_vectors(("Hash", "SHA3"), file, descr,
+                                     {"len": lambda x: int(x),
+                                      "nlen": lambda x: int(x),
+                                      "slen": lambda x: int(x)}) or []
+
+    for idx, tv in enumerate(test_vectors):
+        if getattr(tv, "len", 0) == 0:
+            data = b("")
+        else:
+            data = tobytes(tv.msg)
+            assert(tv.len == len(tv.msg)*8)
+        if getattr(tv, "nlen", 0) != 0:
+            raise ValueError("Unsupported cSHAKE test vector")
+        if getattr(tv, "slen", 0) == 0:
+            custom = b("")
+        else:
+            custom = tobytes(tv.s)
+            assert(tv.slen == len(tv.s)*8)
+
+        def new_test(self, data=data, result=tv.md, custom=custom, test_class=test_class):
+            hobj = test_class.new(data=data, custom=custom)
+            digest = hobj.read(len(result))
+            self.assertEqual(digest, result)
+
+        setattr(cSHAKEVectors, "test_%s_%d" % (tag, idx), new_test)
+
+
+def get_tests(config={}):
+    tests = []
+    tests += list_test_cases(cSHAKE128Test)
+    tests += list_test_cases(cSHAKE256Test)
+    tests += list_test_cases(cSHAKEVectors)
+    return tests
+
+
+if __name__ == '__main__':
+    import unittest
+    suite = lambda: unittest.TestSuite(get_tests())
+    unittest.main(defaultTest='suite')