GIF89a=( õ' 7IAXKgNgYvYx\%wh…hŽth%ˆs%—x¨}9®Œ©€&©‰%¶†(¹–.¹5·œD¹&Çš)ÇŸ5ǘ;Í£*È¡&Õ²)ׯ7×µ<Ñ»4ï°3ø‘HÖ§KͯT÷¨Yÿšqÿ»qÿÔFØ !ù ' !ÿ NETSCAPE2.0 , =( þÀ“pH,È¤rÉl:ŸÐ¨tJ­Z¯Ø¬vËíz¿à°xL.›Ïè´zÍn»ßð¸|N¯Ûïø¼~Ïïûÿ€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ ¡¢£¤¥¦§gª«ªE¯°¨¬ª±²Œ¹º¹E¾­”´ÂB¶¯ §Åȸ»ÑD¾¿Á•ÄÅ®° ÝH¾ÒLÀÆDÙ«D¶BÝïðÀ¾DÑÑÔTÌÍíH òGö¨A RÎڐ |¥ ٭&ºìE8œ¹kGÔAÞpx­a¶­ã R2XB®åE8I€Õ6Xî:vT)äžþÀq¦è³¥ì仕F~%xñ  4#ZÔ‰O|-4Bs‘X:= QÉ œš lºÒyXJŠGȦ|s hÏíK–3l7·B|¥$'7Jީܪ‰‡àá”Dæn=Pƒ ¤Òëí‰`䌨ljóá¯Éüv>á–Á¼5 ½.69ûϸd«­ºÀûnlv©‹ªîf{¬ÜãPbŸ  l5‘Ž¯pß ´ ˜3aÅùäI«O’ý·‘áÞ‡˜¾Æ‚ÙÏiÇÿ‹Àƒ #öó)pâš Þ½ ‘Ý{ó)vmÞü%D~ 6f s}ŃƒDØW Eþ`‡þ À…L8xá†ç˜{)x`X/> Ì}mø‚–RØ‘*|`D=‚Ø_ ^ð5 !_…'aä“OÚ—7âcð`D”Cx`ÝÂ¥ä‹éY¹—F¼¤¥Š?¡Õ™ n@`} lď’ÄÉ@4>ñd œ à‘vÒxNÃ×™@žd=ˆgsžG±æ ´²æud &p8Qñ)ˆ«lXD©øÜéAžHìySun jª×k*D¤LH] †¦§C™Jä–´Xb~ʪwStŽ6K,°£qÁœ:9ت:¨þªl¨@¡`‚ûÚ ».Û¬¯t‹ÆSÉ[:°=Š‹„‘Nåû”Ìî{¿ÂA ‡Rà›ÀÙ6úë°Ÿð0Ä_ ½;ÃϱîÉì^ÇÛÇ#Ëë¼ôº!±Ä˜íUîÅÇ;0L1óÁµö«p% AÀºU̬ݵ¼á%霼€‡¯Á~`ÏG¯»À× ­²± =4ªnpð3¾¤³¯­ü¾¦îuÙuµÙ®|%2ÊIÿür¦#0·ÔJ``8È@S@5ê¢ ö×Þ^`8EÜ]ý.뜃Âç 7 ú ȉÞj œ½Dç zý¸iþœÑÙûÄë!ˆÞÀl§Ïw‹*DçI€nEX¯¬¼ &A¬Go¼QföõFç°¯;é¦÷îŽêJ°îúôF5¡ÌQ|îúöXªæ»TÁÏyñêï]ê² o óÎC=öõ›ÒÓPB@ D×½œä(>èCÂxŽ`±«Ÿ–JЀ»Û á¤±p+eE0`ëŽ`A Ú/NE€Ø†À9‚@¤à H½7”à‡%B‰`Àl*ƒó‘–‡8 2ñ%¸ —€:Ù1Á‰E¸àux%nP1ð!‘ðC)¾P81lÑɸF#ˆ€{´âé°ÈB„0>±û °b¡Š´±O‚3È–Ù()yRpbµ¨E.Z‘D8ÊH@% òŒx+%Ù˜Æcü »¸˜fõ¬b·d`Fê™8èXH"ÉÈ-±|1Ô6iI, 2““¬$+](A*jÐ QTÂo‰.ÛU슬Œã„Ž`¯SN¡–¶Äåyše¯ª’­¬‚´b¦Éož œ)åyâ@Ì®3 ÎtT̉°&Ø+žLÀf"Ø-|žçÔ>‡Ðv¦Ðžì\‚ Q1)Ž@Žh#aP72”ˆ™¨$‚ !ù " , =( …7IAXG]KgNgYvYxR"k\%w]'}hŽth%ˆg+ˆs%—r.—m3šx3˜x¨}9®€&©€+¨‡7§‰%¶†(¹–.¹œD¹&ǘ;Í•&ײ)×»4ïÌ6ò§KÍ þ@‘pH,È¤rÉl:ŸÐ¨tJ­Z¯Ø¬vËíz¿à°xL.›Ïè´zÍn»ßð¸|N¯Ûïø¼~Ïïûÿ€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ ¡¢£¤¥¦§g «¬ E ±± ¨­¶°ººE Á´”·®C¬²§Ç¶Œ»ÓDÃÕƷ¯Ê±H½ºM×ÁGÚ¬D¶BËÁ½î½DÓôTÏÛßîG»ôõC×CÌ l&âž:'òtU³6ɹ#·Ø)€'Ü.6±&ëÍÈ» K(8p0N?!æ2"ÛˆNIJX>R¼ÐO‚M '¡¨2¸*Ÿþ>#n↠å@‚<[:¡Iïf’ ¤TÚ˘CdbÜÙ“[«ŽEú5MBo¤×@€`@„€Êt W-3 ¶Ÿ¡BíêäjIÝ…Eò9[T…$íêﯧ„…•s»Óȳ¹€ÅÚdc®UUρ#±Ùïldj?´í¼²`\ŽÁðÞu|3'ÖŒ]ë6 ¶S#²‡˜FKLÈ *N E´‘áäŠ$˜›eÄYD„ºq«.è촁ƒs \-ÔjA 9²õ÷å- üúM[Âx(ís÷ì®x€|í¡Ù’p¦‚ ŽkÛTÇDpE@WÜ ²Ç]kŠ1¨ þ€·Yb ÓÁ‰l°*n0 ç™—žzBdОu¾7ĉBl€â‰-ºx~|UåU‰  h*Hœ|e"#"?vpÄiŠe6^ˆ„+qâŠm8 #VÇá ‘å–ÄV„œ|Šè•m"сœn|@›U¶ÆΞ—Špb¥G¨ED”€±Úê2FÌIç? >Éxå Œ± ¡¤„%‘žjŸ‘ꄯ<Ìaà9ijÐ2˜D¦È&›†Z`‚å]wþ¼Â:ç6àB¤7eFJ|õÒ§Õ,¨äàFÇ®cS·Ê¶+B°,‘Þ˜ºNûãØ>PADÌHD¹æž«ÄÀnÌ¥}­#Ë’ë QÀÉSÌÂÇ2ÌXÀ{æk²lQÁ2«ÊðÀ¯w|2Í h‹ÄÂG€,m¾¶ë3ÐÙ6-´ÅE¬L°ÆIij*K½ÀÇqï`DwVÍQXœÚÔpeœ±¬Ñ q˜§Tœ½µƒ°Œìu Â<¶aØ*At¯lmEØ ü ôÛN[P1ÔÛ¦­±$ÜÆ@`ùåDpy¶yXvCAyåB`ŽD¶ 0QwG#¯ æš[^Äþ $ÀÓÝǦ{„L™[±úKÄgÌ;ï£S~¹ìGX.ôgoT.»åˆ°ùŸûù¡?1zö¦Ÿž:ÅgÁ|ìL¹ „®£œŠ‚à0œ]PÁ^p F<"•ç?!,ñ‡N4—…PÄ Á„ö¨Û:Tè@hÀ‹%táÿ:ø-žI<`þ‹p I….)^ 40D#p@ƒj4–؀:²‰1Øâr˜¼F2oW¼#Z†;$Q q” ‘ ÂK¦ñNl#29 !’F@¥Bh·ᏀL!—XFóLH‘Kh¤.«hE&JòG¨¥<™WN!€ÑÙÚˆY„@†>Œž19J" 2,/ &.GXB%ÌRÈ9B6¹W]’î×ÔW¥’IÎ$ ñ‹ÓŒE8YÆ ¼³™ñA5“à®Q.aŸB€&Ø©³ JÁ—! ¦t)K%tœ-¦JF bòNMxLôþ)ÐR¸Ð™‘ èÝ6‘O!THÌ„HÛ ‰ !ù ) , =( …AXKgNgYvYxR"k\%wh…hŽh%ˆg+ˆs%—r.—x3˜x¨}9®€&©€+¨Œ,©‡7§‰%¶†(¹–.¹5·&Çš)ǘ;Í•&×£*Ȳ)ׯ7×»4ï°3øÌ6ò‘HÖ§KÍ»Hó¯T÷¨Yÿ»qÿÇhÿ þÀ”pH,È¤rÉl:ŸÐ¨tJ­Z¯Ø¬vËíz¿à°xL.›Ïè´zÍn»ßð¸|N¯Ûïø¼~Ïïûÿ€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ ¡¢£¤¥¦§g ª« E$±²¨ª­ · °²½$E$ÂÕ««D· Í ¿¦Ç¶¸ÌŒ¾³CÃÅÆ E ééH½MÛÂGâªD­ çBêêϾD²ÒaÀà€Š1r­ðÓ¤ ÔožzU!L˜C'¾yW½UGtäÇïÙllê0×àÂuGþ)AÀs[þ·xì ÁxO%ƒûX2ó—  P£n›R/¡ÑšHše+êDm?# —‘Ç£6¡8íJ¡ŸâDiäªM¥Ö„ôj“¬¹£5oQ7°- <‡ *´lãÓŒ2r/a!l)dÈ A™ÈE¢ôÔ͆…ð ;Ö˜c ¡%ß‚’Ùˆâ¸b½—pe~C"BíëÚHïeF2§æŠ8qb t_`urŠeü wÅu3êæPv§h•"ß`íÍxçLĹÜÖ3á  ~Öº“®›¸ÏMDfJÙ °„ÛµáWõ%§œ‚à©–‚X Ó؁)@®Ñ›Eþ´wëuÅSxb8y\mÖzœ¥§ZbºE—ÂLªÌw!y(>¡™wú=Ç|ÅÝs¢d €CÁW)HÜcC$€L Ä7„r.á\{)@ð` @ äXÈ$PD” `šaG:§æˆOˆ72EÐamn]ù"ŒcÊxÑŒ° &dR8`g«iÙŸLR!¦P …d’ä¡“¦ðÎTƒ¦ià|À _ ¥ Qi#¦Šg›Æ ›noMµ ›V ã£)p ç£ÎW…š=Âeªk§†j„ ´®1ß²sÉxéW«jšl|0¯B0Û, \jÛ´›6±¬¶C ÛíWþï|ëÙ‹¸ñzĸV {ì;Ýñn¼òVˆm³I¼³.Ðã¤PN¥ ²µ¼„µCã+¹ÍByî£Ñ¾HŸ›ëê 7ìYÆFTk¨SaoaY$Dµœìï¿Ã29RÈkt Çïfñ ÇÒ:ÀÐSp¹3ÇI¨â¥DZÄ ü9Ïýögñ½­uÔ*3)O‘˜Ö[_hv ,àî×Et Ÿé¶BH€ Õ[ü±64M@ÔSÌM7dÐl5-ÄÙU܍´©zߌ3Ô€3ž„ „ ¶ÛPô½5×g› êÚ˜kN„Ý…0Îj4€Ìë°“#{þÕ3S2çKÜ'ợlø¼Ú2K{° {Û¶?žm𸧠ËI¼nEò='êüóºè^üæÃ_Û=°óž‚ì#Oý¿Í'¡½áo..ÏYìnüñCœO±Áa¿¢Kô½o,üÄËbö²çºíï{ËC Ú— "”Ï{ËK ÍÒw„õ±Oz dÕ¨à:$ ƒô—«v»] A#ð «€¿šéz)Rx׿ˆ¥‚d``èw-îyÏf×K!ð€þ­Ð|ìPľ„=Ì`ý(f” 'Pa ¥ÐBJa%Ðâf§„%Š¡}FàáÝ×6>ÉäŠG"éŽè=ø!oŠ°^FP¼Ø©Q„ÀCÙÁ`(Ž\ÄÝ® ©Â$<n@dÄ E#ììUÒI! ‚#lù‹`k¦ÐÇ'Rró’ZýNBÈMF Í[¤+‹ðɈ-áwj¨¥þ8¾rá ,VÂh„"|½œ=×G_¦Ñ™EØ 0i*%̲˜Æda0mV‚k¾)›;„&6 p>ÓjK “¦Ç# âDÂ:ûc?:R Ó¬fÞéI-Ì“•Ã<ä=™Ï7˜3œ¨˜c2ŒW ,ˆ”8(T™P‰F¡Jhç"‚ ; 403WebShell
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# ===================================================================
#
# Copyright (c) 2014, Legrandin <[email protected]>
# 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.loader import load_test_vectors
from Crypto.SelfTest.st_common import list_test_cases
from Crypto.Util.py3compat import tobytes, is_string
from Crypto.Cipher import AES, DES3, DES
from Crypto.Hash import SHAKE128


def get_tag_random(tag, length):
    return SHAKE128.new(data=tobytes(tag)).read(length)

class BlockChainingTests(unittest.TestCase):

    key_128 = get_tag_random("key_128", 16)
    key_192 = get_tag_random("key_192", 24)
    iv_128 = get_tag_random("iv_128", 16)
    iv_64 = get_tag_random("iv_64", 8)
    data_128 = get_tag_random("data_128", 16)

    def test_loopback_128(self):
        cipher = AES.new(self.key_128, self.aes_mode, self.iv_128)
        pt = get_tag_random("plaintext", 16 * 100)
        ct = cipher.encrypt(pt)

        cipher = AES.new(self.key_128, self.aes_mode, self.iv_128)
        pt2 = cipher.decrypt(ct)
        self.assertEqual(pt, pt2)

    def test_loopback_64(self):
        cipher = DES3.new(self.key_192, self.des3_mode, self.iv_64)
        pt = get_tag_random("plaintext", 8 * 100)
        ct = cipher.encrypt(pt)

        cipher = DES3.new(self.key_192, self.des3_mode, self.iv_64)
        pt2 = cipher.decrypt(ct)
        self.assertEqual(pt, pt2)

    def test_iv(self):
        # If not passed, the iv is created randomly
        cipher = AES.new(self.key_128, self.aes_mode)
        iv1 = cipher.iv
        cipher = AES.new(self.key_128, self.aes_mode)
        iv2 = cipher.iv
        self.assertNotEqual(iv1, iv2)
        self.assertEqual(len(iv1), 16)

        # IV can be passed in uppercase or lowercase
        cipher = AES.new(self.key_128, self.aes_mode, self.iv_128)
        ct = cipher.encrypt(self.data_128)

        cipher = AES.new(self.key_128, self.aes_mode, iv=self.iv_128)
        self.assertEqual(ct, cipher.encrypt(self.data_128))

        cipher = AES.new(self.key_128, self.aes_mode, IV=self.iv_128)
        self.assertEqual(ct, cipher.encrypt(self.data_128))

    def test_iv_must_be_bytes(self):
        self.assertRaises(TypeError, AES.new, self.key_128, self.aes_mode,
                          iv = u'test1234567890-*')

    def test_only_one_iv(self):
        # Only one IV/iv keyword allowed
        self.assertRaises(TypeError, AES.new, self.key_128, self.aes_mode,
                          iv=self.iv_128, IV=self.iv_128)

    def test_iv_with_matching_length(self):
        self.assertRaises(ValueError, AES.new, self.key_128, self.aes_mode,
                          b"")
        self.assertRaises(ValueError, AES.new, self.key_128, self.aes_mode,
                          self.iv_128[:15])
        self.assertRaises(ValueError, AES.new, self.key_128, self.aes_mode,
                          self.iv_128 + b"0")

    def test_block_size_128(self):
        cipher = AES.new(self.key_128, self.aes_mode, self.iv_128)
        self.assertEqual(cipher.block_size, AES.block_size)

    def test_block_size_64(self):
        cipher = DES3.new(self.key_192, self.des3_mode, self.iv_64)
        self.assertEqual(cipher.block_size, DES3.block_size)

    def test_unaligned_data_128(self):
        cipher = AES.new(self.key_128, self.aes_mode, self.iv_128)
        for wrong_length in range(1,16):
            self.assertRaises(ValueError, cipher.encrypt, b"5" * wrong_length)

        cipher = AES.new(self.key_128, self.aes_mode, self.iv_128)
        for wrong_length in range(1,16):
            self.assertRaises(ValueError, cipher.decrypt, b"5" * wrong_length)

    def test_unaligned_data_64(self):
        cipher = DES3.new(self.key_192, self.des3_mode, self.iv_64)
        for wrong_length in range(1,8):
            self.assertRaises(ValueError, cipher.encrypt, b"5" * wrong_length)

        cipher = DES3.new(self.key_192, self.des3_mode, self.iv_64)
        for wrong_length in range(1,8):
            self.assertRaises(ValueError, cipher.decrypt, b"5" * wrong_length)

    def test_IV_iv_attributes(self):
        data = get_tag_random("data", 16 * 100)
        for func in "encrypt", "decrypt":
            cipher = AES.new(self.key_128, self.aes_mode, self.iv_128)
            getattr(cipher, func)(data)
            self.assertEqual(cipher.iv, self.iv_128)
            self.assertEqual(cipher.IV, self.iv_128)

    def test_unknown_parameters(self):
        self.assertRaises(TypeError, AES.new, self.key_128, self.aes_mode,
                          self.iv_128, 7)
        self.assertRaises(TypeError, AES.new, self.key_128, self.aes_mode,
                          iv=self.iv_128, unknown=7)
        # But some are only known by the base cipher (e.g. use_aesni consumed by the AES module)
        AES.new(self.key_128, self.aes_mode, iv=self.iv_128, use_aesni=False)

    def test_null_encryption_decryption(self):
        for func in "encrypt", "decrypt":
            cipher = AES.new(self.key_128, self.aes_mode, self.iv_128)
            result = getattr(cipher, func)(b"")
            self.assertEqual(result, b"")

    def test_either_encrypt_or_decrypt(self):
        cipher = AES.new(self.key_128, self.aes_mode, self.iv_128)
        cipher.encrypt(b"")
        self.assertRaises(TypeError, cipher.decrypt, b"")

        cipher = AES.new(self.key_128, self.aes_mode, self.iv_128)
        cipher.decrypt(b"")
        self.assertRaises(TypeError, cipher.encrypt, b"")

    def test_data_must_be_bytes(self):
        cipher = AES.new(self.key_128, self.aes_mode, self.iv_128)
        self.assertRaises(TypeError, cipher.encrypt, u'test1234567890-*')

        cipher = AES.new(self.key_128, self.aes_mode, self.iv_128)
        self.assertRaises(TypeError, cipher.decrypt, u'test1234567890-*')

    def test_bytearray(self):
        data = b"1" * 128
        data_ba = bytearray(data)

        # Encrypt
        key_ba = bytearray(self.key_128)
        iv_ba = bytearray(self.iv_128)

        cipher1 = AES.new(self.key_128, self.aes_mode, self.iv_128)
        ref1 = cipher1.encrypt(data)

        cipher2 = AES.new(key_ba, self.aes_mode, iv_ba)
        key_ba[:3] = b'\xFF\xFF\xFF'
        iv_ba[:3] = b'\xFF\xFF\xFF'
        ref2 = cipher2.encrypt(data_ba)

        self.assertEqual(ref1, ref2)
        self.assertEqual(cipher1.iv, cipher2.iv)

        # Decrypt
        key_ba = bytearray(self.key_128)
        iv_ba = bytearray(self.iv_128)

        cipher3 = AES.new(self.key_128, self.aes_mode, self.iv_128)
        ref3 = cipher3.decrypt(data)

        cipher4 = AES.new(key_ba, self.aes_mode, iv_ba)
        key_ba[:3] = b'\xFF\xFF\xFF'
        iv_ba[:3] = b'\xFF\xFF\xFF'
        ref4 = cipher4.decrypt(data_ba)

        self.assertEqual(ref3, ref4)

    def test_memoryview(self):
        data = b"1" * 128
        data_mv = memoryview(bytearray(data))

        # Encrypt
        key_mv = memoryview(bytearray(self.key_128))
        iv_mv = memoryview(bytearray(self.iv_128))

        cipher1 = AES.new(self.key_128, self.aes_mode, self.iv_128)
        ref1 = cipher1.encrypt(data)

        cipher2 = AES.new(key_mv, self.aes_mode, iv_mv)
        key_mv[:3] = b'\xFF\xFF\xFF'
        iv_mv[:3] = b'\xFF\xFF\xFF'
        ref2 = cipher2.encrypt(data_mv)

        self.assertEqual(ref1, ref2)
        self.assertEqual(cipher1.iv, cipher2.iv)

        # Decrypt
        key_mv = memoryview(bytearray(self.key_128))
        iv_mv = memoryview(bytearray(self.iv_128))

        cipher3 = AES.new(self.key_128, self.aes_mode, self.iv_128)
        ref3 = cipher3.decrypt(data)

        cipher4 = AES.new(key_mv, self.aes_mode, iv_mv)
        key_mv[:3] = b'\xFF\xFF\xFF'
        iv_mv[:3] = b'\xFF\xFF\xFF'
        ref4 = cipher4.decrypt(data_mv)

        self.assertEqual(ref3, ref4)

    def test_output_param(self):

        pt = b'5' * 128
        cipher = AES.new(b'4'*16, self.aes_mode, iv=self.iv_128)
        ct = cipher.encrypt(pt)

        output = bytearray(128)
        cipher = AES.new(b'4'*16, self.aes_mode, iv=self.iv_128)
        res = cipher.encrypt(pt, output=output)
        self.assertEqual(ct, output)
        self.assertEqual(res, None)

        cipher = AES.new(b'4'*16, self.aes_mode, iv=self.iv_128)
        res = cipher.decrypt(ct, output=output)
        self.assertEqual(pt, output)
        self.assertEqual(res, None)


    def test_output_param_same_buffer(self):

        pt = b'5' * 128
        cipher = AES.new(b'4'*16, self.aes_mode, iv=self.iv_128)
        ct = cipher.encrypt(pt)

        pt_ba = bytearray(pt)
        cipher = AES.new(b'4'*16, self.aes_mode, iv=self.iv_128)
        res = cipher.encrypt(pt_ba, output=pt_ba)
        self.assertEqual(ct, pt_ba)
        self.assertEqual(res, None)

        ct_ba = bytearray(ct)
        cipher = AES.new(b'4'*16, self.aes_mode, iv=self.iv_128)
        res = cipher.decrypt(ct_ba, output=ct_ba)
        self.assertEqual(pt, ct_ba)
        self.assertEqual(res, None)


    def test_output_param_memoryview(self):

        pt = b'5' * 128
        cipher = AES.new(b'4'*16, self.aes_mode, iv=self.iv_128)
        ct = cipher.encrypt(pt)

        output = memoryview(bytearray(128))
        cipher = AES.new(b'4'*16, self.aes_mode, iv=self.iv_128)
        cipher.encrypt(pt, output=output)
        self.assertEqual(ct, output)

        cipher = AES.new(b'4'*16, self.aes_mode, iv=self.iv_128)
        cipher.decrypt(ct, output=output)
        self.assertEqual(pt, output)

    def test_output_param_neg(self):
        LEN_PT = 128

        pt = b'5' * LEN_PT
        cipher = AES.new(b'4'*16, self.aes_mode, iv=self.iv_128)
        ct = cipher.encrypt(pt)

        cipher = AES.new(b'4'*16, self.aes_mode, iv=self.iv_128)
        self.assertRaises(TypeError, cipher.encrypt, pt, output=b'0' * LEN_PT)

        cipher = AES.new(b'4'*16, self.aes_mode, iv=self.iv_128)
        self.assertRaises(TypeError, cipher.decrypt, ct, output=b'0' * LEN_PT)

        shorter_output = bytearray(LEN_PT - 1)
        cipher = AES.new(b'4'*16, self.aes_mode, iv=self.iv_128)
        self.assertRaises(ValueError, cipher.encrypt, pt, output=shorter_output)
        cipher = AES.new(b'4'*16, self.aes_mode, iv=self.iv_128)
        self.assertRaises(ValueError, cipher.decrypt, ct, output=shorter_output)


class CbcTests(BlockChainingTests):
    aes_mode = AES.MODE_CBC
    des3_mode = DES3.MODE_CBC


class NistBlockChainingVectors(unittest.TestCase):

    def _do_kat_aes_test(self, file_name):

        test_vectors = load_test_vectors(("Cipher", "AES"),
                            file_name,
                            "AES CBC KAT",
                            { "count" : lambda x: int(x) } )
        if test_vectors is None:
            return

        direction = None
        for tv in test_vectors:

            # The test vector file contains some directive lines
            if is_string(tv):
                direction = tv
                continue

            self.description = tv.desc

            cipher = AES.new(tv.key, self.aes_mode, tv.iv)
            if direction == "[ENCRYPT]":
                self.assertEqual(cipher.encrypt(tv.plaintext), tv.ciphertext)
            elif direction == "[DECRYPT]":
                self.assertEqual(cipher.decrypt(tv.ciphertext), tv.plaintext)
            else:
                assert False

    # See Section 6.4.2 in AESAVS
    def _do_mct_aes_test(self, file_name):

        test_vectors = load_test_vectors(("Cipher", "AES"),
                            file_name,
                            "AES CBC Montecarlo",
                            { "count" : lambda x: int(x) } )
        if test_vectors is None:
            return

        direction = None
        for tv in test_vectors:

            # The test vector file contains some directive lines
            if is_string(tv):
                direction = tv
                continue

            self.description = tv.desc
            cipher = AES.new(tv.key, self.aes_mode, tv.iv)

            if direction == '[ENCRYPT]':
                cts = [ tv.iv ]
                for count in range(1000):
                    cts.append(cipher.encrypt(tv.plaintext))
                    tv.plaintext = cts[-2]
                self.assertEqual(cts[-1], tv.ciphertext)
            elif direction == '[DECRYPT]':
                pts = [ tv.iv]
                for count in range(1000):
                    pts.append(cipher.decrypt(tv.ciphertext))
                    tv.ciphertext = pts[-2]
                self.assertEqual(pts[-1], tv.plaintext)
            else:
                assert False

    def _do_tdes_test(self, file_name):

        test_vectors = load_test_vectors(("Cipher", "TDES"),
                            file_name,
                            "TDES CBC KAT",
                            { "count" : lambda x: int(x) } )
        if test_vectors is None:
            return

        direction = None
        for tv in test_vectors:

            # The test vector file contains some directive lines
            if is_string(tv):
                direction = tv
                continue

            self.description = tv.desc
            if hasattr(tv, "keys"):
                cipher = DES.new(tv.keys, self.des_mode, tv.iv)
            else:
                if tv.key1 != tv.key3:
                    key = tv.key1 + tv.key2 + tv.key3  # Option 3
                else:
                    key = tv.key1 + tv.key2            # Option 2
                cipher = DES3.new(key, self.des3_mode, tv.iv)

            if direction == "[ENCRYPT]":
                self.assertEqual(cipher.encrypt(tv.plaintext), tv.ciphertext)
            elif direction == "[DECRYPT]":
                self.assertEqual(cipher.decrypt(tv.ciphertext), tv.plaintext)
            else:
                assert False


class NistCbcVectors(NistBlockChainingVectors):
    aes_mode = AES.MODE_CBC
    des_mode = DES.MODE_CBC
    des3_mode = DES3.MODE_CBC


# Create one test method per file
nist_aes_kat_mmt_files = (
    # KAT
    "CBCGFSbox128.rsp",
    "CBCGFSbox192.rsp",
    "CBCGFSbox256.rsp",
    "CBCKeySbox128.rsp",
    "CBCKeySbox192.rsp",
    "CBCKeySbox256.rsp",
    "CBCVarKey128.rsp",
    "CBCVarKey192.rsp",
    "CBCVarKey256.rsp",
    "CBCVarTxt128.rsp",
    "CBCVarTxt192.rsp",
    "CBCVarTxt256.rsp",
    # MMT
    "CBCMMT128.rsp",
    "CBCMMT192.rsp",
    "CBCMMT256.rsp",
    )
nist_aes_mct_files = (
    "CBCMCT128.rsp",
    "CBCMCT192.rsp",
    "CBCMCT256.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(NistCbcVectors, "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(NistCbcVectors, "test_AES_" + file_name, new_func)
del file_name, new_func

nist_tdes_files = (
    "TCBCMMT2.rsp",    # 2TDES
    "TCBCMMT3.rsp",    # 3TDES
    "TCBCinvperm.rsp", # Single DES
    "TCBCpermop.rsp",
    "TCBCsubtab.rsp",
    "TCBCvarkey.rsp",
    "TCBCvartext.rsp",
    )

for file_name in nist_tdes_files:
    def new_func(self, file_name=file_name):
        self._do_tdes_test(file_name)
    setattr(NistCbcVectors, "test_TDES_" + file_name, new_func)

# END OF NIST CBC TEST VECTORS


class SP800TestVectors(unittest.TestCase):
    """Class exercising the CBC test vectors found in Section F.2
    of NIST SP 800-3A"""

    def test_aes_128(self):
        key =           '2b7e151628aed2a6abf7158809cf4f3c'
        iv =            '000102030405060708090a0b0c0d0e0f'
        plaintext =     '6bc1bee22e409f96e93d7e117393172a' +\
                        'ae2d8a571e03ac9c9eb76fac45af8e51' +\
                        '30c81c46a35ce411e5fbc1191a0a52ef' +\
                        'f69f2445df4f9b17ad2b417be66c3710'
        ciphertext =    '7649abac8119b246cee98e9b12e9197d' +\
                        '5086cb9b507219ee95db113a917678b2' +\
                        '73bed6b8e3c1743b7116e69e22229516' +\
                        '3ff1caa1681fac09120eca307586e1a7'

        key = unhexlify(key)
        iv = unhexlify(iv)
        plaintext = unhexlify(plaintext)
        ciphertext = unhexlify(ciphertext)

        cipher = AES.new(key, AES.MODE_CBC, iv)
        self.assertEqual(cipher.encrypt(plaintext), ciphertext)
        cipher = AES.new(key, AES.MODE_CBC, iv)
        self.assertEqual(cipher.decrypt(ciphertext), plaintext)

    def test_aes_192(self):
        key =           '8e73b0f7da0e6452c810f32b809079e562f8ead2522c6b7b'
        iv =            '000102030405060708090a0b0c0d0e0f'
        plaintext =     '6bc1bee22e409f96e93d7e117393172a' +\
                        'ae2d8a571e03ac9c9eb76fac45af8e51' +\
                        '30c81c46a35ce411e5fbc1191a0a52ef' +\
                        'f69f2445df4f9b17ad2b417be66c3710'
        ciphertext =    '4f021db243bc633d7178183a9fa071e8' +\
                        'b4d9ada9ad7dedf4e5e738763f69145a' +\
                        '571b242012fb7ae07fa9baac3df102e0' +\
                        '08b0e27988598881d920a9e64f5615cd'

        key = unhexlify(key)
        iv = unhexlify(iv)
        plaintext = unhexlify(plaintext)
        ciphertext = unhexlify(ciphertext)

        cipher = AES.new(key, AES.MODE_CBC, iv)
        self.assertEqual(cipher.encrypt(plaintext), ciphertext)
        cipher = AES.new(key, AES.MODE_CBC, iv)
        self.assertEqual(cipher.decrypt(ciphertext), plaintext)

    def test_aes_256(self):
        key =           '603deb1015ca71be2b73aef0857d77811f352c073b6108d72d9810a30914dff4'
        iv =            '000102030405060708090a0b0c0d0e0f'
        plaintext =     '6bc1bee22e409f96e93d7e117393172a' +\
                        'ae2d8a571e03ac9c9eb76fac45af8e51' +\
                        '30c81c46a35ce411e5fbc1191a0a52ef' +\
                        'f69f2445df4f9b17ad2b417be66c3710'
        ciphertext =    'f58c4c04d6e5f1ba779eabfb5f7bfbd6' +\
                        '9cfc4e967edb808d679f777bc6702c7d' +\
                        '39f23369a9d9bacfa530e26304231461' +\
                        'b2eb05e2c39be9fcda6c19078c6a9d1b'

        key = unhexlify(key)
        iv = unhexlify(iv)
        plaintext = unhexlify(plaintext)
        ciphertext = unhexlify(ciphertext)

        cipher = AES.new(key, AES.MODE_CBC, iv)
        self.assertEqual(cipher.encrypt(plaintext), ciphertext)
        cipher = AES.new(key, AES.MODE_CBC, iv)
        self.assertEqual(cipher.decrypt(ciphertext), plaintext)


def get_tests(config={}):
    tests = []
    tests += list_test_cases(CbcTests)
    if config.get('slow_tests'):
        tests += list_test_cases(NistCbcVectors)
    tests += list_test_cases(SP800TestVectors)
    return tests


if __name__ == '__main__':
    suite = lambda: unittest.TestSuite(get_tests())
    unittest.main(defaultTest='suite')

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