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diff --git a/lib/Crypto/SelfTest/Cipher/test_OFB.py b/lib/Crypto/SelfTest/Cipher/test_OFB.py
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+# ===================================================================
+#
+# Copyright (c) 2015, Legrandin <helderijs@gmail.com>
+# All rights reserved.
+#
+# 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.
+# ===================================================================
+
+import unittest
+from binascii import unhexlify
+
+from Crypto.SelfTest.st_common import list_test_cases
+from Crypto.Util.py3compat import tobytes
+from Crypto.Cipher import AES, DES3, DES
+from Crypto.Hash import SHAKE128
+from Crypto.SelfTest.loader import load_test_vectors_wycheproof
+
+def get_tag_random(tag, length):
+    return SHAKE128.new(data=tobytes(tag)).read(length)
+
+from Crypto.SelfTest.Cipher.test_CBC import BlockChainingTests
+
+class OfbTests(BlockChainingTests):
+
+    aes_mode = AES.MODE_OFB
+    des3_mode = DES3.MODE_OFB
+
+    # Redefine test_unaligned_data_128/64
+
+    def test_unaligned_data_128(self):
+        plaintexts = [ b"7777777" ] * 100
+
+        cipher = AES.new(self.key_128, AES.MODE_CFB, self.iv_128, segment_size=8)
+        ciphertexts = [ cipher.encrypt(x) for x in plaintexts ]
+        cipher = AES.new(self.key_128, AES.MODE_CFB, self.iv_128, segment_size=8)
+        self.assertEqual(b"".join(ciphertexts), cipher.encrypt(b"".join(plaintexts)))
+
+        cipher = AES.new(self.key_128, AES.MODE_CFB, self.iv_128, segment_size=128)
+        ciphertexts = [ cipher.encrypt(x) for x in plaintexts ]
+        cipher = AES.new(self.key_128, AES.MODE_CFB, self.iv_128, segment_size=128)
+        self.assertEqual(b"".join(ciphertexts), cipher.encrypt(b"".join(plaintexts)))
+
+    def test_unaligned_data_64(self):
+        plaintexts = [ b"7777777" ] * 100
+        cipher = DES3.new(self.key_192, DES3.MODE_CFB, self.iv_64, segment_size=8)
+        ciphertexts = [ cipher.encrypt(x) for x in plaintexts ]
+        cipher = DES3.new(self.key_192, DES3.MODE_CFB, self.iv_64, segment_size=8)
+        self.assertEqual(b"".join(ciphertexts), cipher.encrypt(b"".join(plaintexts)))
+
+        cipher = DES3.new(self.key_192, DES3.MODE_CFB, self.iv_64, segment_size=64)
+        ciphertexts = [ cipher.encrypt(x) for x in plaintexts ]
+        cipher = DES3.new(self.key_192, DES3.MODE_CFB, self.iv_64, segment_size=64)
+        self.assertEqual(b"".join(ciphertexts), cipher.encrypt(b"".join(plaintexts)))
+
+
+from Crypto.SelfTest.Cipher.test_CBC import NistBlockChainingVectors
+
+class NistOfbVectors(NistBlockChainingVectors):
+    aes_mode = AES.MODE_OFB
+    des_mode = DES.MODE_OFB
+    des3_mode = DES3.MODE_OFB
+
+
+# Create one test method per file
+nist_aes_kat_mmt_files = (
+    # KAT
+    "OFBGFSbox128.rsp",
+    "OFBGFSbox192.rsp",
+    "OFBGFSbox256.rsp",
+    "OFBKeySbox128.rsp",
+    "OFBKeySbox192.rsp",
+    "OFBKeySbox256.rsp",
+    "OFBVarKey128.rsp",
+    "OFBVarKey192.rsp",
+    "OFBVarKey256.rsp",
+    "OFBVarTxt128.rsp",
+    "OFBVarTxt192.rsp",
+    "OFBVarTxt256.rsp",
+    # MMT
+    "OFBMMT128.rsp",
+    "OFBMMT192.rsp",
+    "OFBMMT256.rsp",
+    )
+nist_aes_mct_files = (
+    "OFBMCT128.rsp",
+    "OFBMCT192.rsp",
+    "OFBMCT256.rsp",
+    )
+
+for file_name in nist_aes_kat_mmt_files:
+    def new_func(self, file_name=file_name):
+        self._do_kat_aes_test(file_name)
+    setattr(NistOfbVectors, "test_AES_" + file_name, new_func)
+
+for file_name in nist_aes_mct_files:
+    def new_func(self, file_name=file_name):
+        self._do_mct_aes_test(file_name)
+    setattr(NistOfbVectors, "test_AES_" + file_name, new_func)
+del file_name, new_func
+
+nist_tdes_files = (
+    "TOFBMMT2.rsp",    # 2TDES
+    "TOFBMMT3.rsp",    # 3TDES
+    "TOFBinvperm.rsp", # Single DES
+    "TOFBpermop.rsp",
+    "TOFBsubtab.rsp",
+    "TOFBvarkey.rsp",
+    "TOFBvartext.rsp",
+    )
+
+for file_name in nist_tdes_files:
+    def new_func(self, file_name=file_name):
+        self._do_tdes_test(file_name)
+    setattr(NistOfbVectors, "test_TDES_" + file_name, new_func)
+
+# END OF NIST OFB TEST VECTORS
+
+
+class SP800TestVectors(unittest.TestCase):
+    """Class exercising the OFB test vectors found in Section F.4
+    of NIST SP 800-3A"""
+
+    def test_aes_128(self):
+        plaintext =     '6bc1bee22e409f96e93d7e117393172a' +\
+                        'ae2d8a571e03ac9c9eb76fac45af8e51' +\
+                        '30c81c46a35ce411e5fbc1191a0a52ef' +\
+                        'f69f2445df4f9b17ad2b417be66c3710'
+        ciphertext =    '3b3fd92eb72dad20333449f8e83cfb4a' +\
+                        '7789508d16918f03f53c52dac54ed825' +\
+                        '9740051e9c5fecf64344f7a82260edcc' +\
+                        '304c6528f659c77866a510d9c1d6ae5e'
+        key =           '2b7e151628aed2a6abf7158809cf4f3c'
+        iv =            '000102030405060708090a0b0c0d0e0f'
+
+        key = unhexlify(key)
+        iv = unhexlify(iv)
+        plaintext = unhexlify(plaintext)
+        ciphertext = unhexlify(ciphertext)
+
+        cipher = AES.new(key, AES.MODE_OFB, iv)
+        self.assertEqual(cipher.encrypt(plaintext), ciphertext)
+        cipher = AES.new(key, AES.MODE_OFB, iv)
+        self.assertEqual(cipher.decrypt(ciphertext), plaintext)
+
+        cipher = AES.new(key, AES.MODE_OFB, iv)
+        self.assertEqual(cipher.encrypt(plaintext[:-8]), ciphertext[:-8])
+        cipher = AES.new(key, AES.MODE_OFB, iv)
+        self.assertEqual(cipher.decrypt(ciphertext[:-8]), plaintext[:-8])
+
+    def test_aes_192(self):
+        plaintext =     '6bc1bee22e409f96e93d7e117393172a' +\
+                        'ae2d8a571e03ac9c9eb76fac45af8e51' +\
+                        '30c81c46a35ce411e5fbc1191a0a52ef' +\
+                        'f69f2445df4f9b17ad2b417be66c3710'
+        ciphertext =    'cdc80d6fddf18cab34c25909c99a4174' +\
+                        'fcc28b8d4c63837c09e81700c1100401' +\
+                        '8d9a9aeac0f6596f559c6d4daf59a5f2' +\
+                        '6d9f200857ca6c3e9cac524bd9acc92a'
+        key =           '8e73b0f7da0e6452c810f32b809079e562f8ead2522c6b7b'
+        iv =            '000102030405060708090a0b0c0d0e0f'
+
+        key = unhexlify(key)
+        iv = unhexlify(iv)
+        plaintext = unhexlify(plaintext)
+        ciphertext = unhexlify(ciphertext)
+
+        cipher = AES.new(key, AES.MODE_OFB, iv)
+        self.assertEqual(cipher.encrypt(plaintext), ciphertext)
+        cipher = AES.new(key, AES.MODE_OFB, iv)
+        self.assertEqual(cipher.decrypt(ciphertext), plaintext)
+
+        cipher = AES.new(key, AES.MODE_OFB, iv)
+        self.assertEqual(cipher.encrypt(plaintext[:-8]), ciphertext[:-8])
+        cipher = AES.new(key, AES.MODE_OFB, iv)
+        self.assertEqual(cipher.decrypt(ciphertext[:-8]), plaintext[:-8])
+
+    def test_aes_256(self):
+        plaintext =     '6bc1bee22e409f96e93d7e117393172a' +\
+                        'ae2d8a571e03ac9c9eb76fac45af8e51' +\
+                        '30c81c46a35ce411e5fbc1191a0a52ef' +\
+                        'f69f2445df4f9b17ad2b417be66c3710'
+        ciphertext =    'dc7e84bfda79164b7ecd8486985d3860' +\
+                        '4febdc6740d20b3ac88f6ad82a4fb08d' +\
+                        '71ab47a086e86eedf39d1c5bba97c408' +\
+                        '0126141d67f37be8538f5a8be740e484'
+        key =           '603deb1015ca71be2b73aef0857d77811f352c073b6108d72d9810a30914dff4'
+        iv =            '000102030405060708090a0b0c0d0e0f'
+
+        key = unhexlify(key)
+        iv = unhexlify(iv)
+        plaintext = unhexlify(plaintext)
+        ciphertext = unhexlify(ciphertext)
+
+        cipher = AES.new(key, AES.MODE_OFB, iv)
+        self.assertEqual(cipher.encrypt(plaintext), ciphertext)
+        cipher = AES.new(key, AES.MODE_OFB, iv)
+        self.assertEqual(cipher.decrypt(ciphertext), plaintext)
+
+        cipher = AES.new(key, AES.MODE_OFB, iv)
+        self.assertEqual(cipher.encrypt(plaintext[:-8]), ciphertext[:-8])
+        cipher = AES.new(key, AES.MODE_OFB, iv)
+        self.assertEqual(cipher.decrypt(ciphertext[:-8]), plaintext[:-8])
+
+
+def get_tests(config={}):
+    tests = []
+    tests += list_test_cases(OfbTests)
+    if config.get('slow_tests'):
+        tests += list_test_cases(NistOfbVectors)
+    tests += list_test_cases(SP800TestVectors)
+    return tests
+
+
+if __name__ == '__main__':
+    suite = lambda: unittest.TestSuite(get_tests())
+    unittest.main(defaultTest='suite')