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) 2015, 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 hexlify, unhexlify

from Crypto.SelfTest.st_common import list_test_cases
from Crypto.Util.py3compat import tobytes, bchr
from Crypto.Cipher import AES, DES3
from Crypto.Hash import SHAKE128, SHA256
from Crypto.Util import Counter

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

class CtrTests(unittest.TestCase):

    key_128 = get_tag_random("key_128", 16)
    key_192 = get_tag_random("key_192", 24)
    nonce_32 = get_tag_random("nonce_32", 4)
    nonce_64 = get_tag_random("nonce_64", 8)
    ctr_64 = Counter.new(32, prefix=nonce_32)
    ctr_128 = Counter.new(64, prefix=nonce_64)

    def test_loopback_128(self):
        cipher = AES.new(self.key_128, AES.MODE_CTR, counter=self.ctr_128)
        pt = get_tag_random("plaintext", 16 * 100)
        ct = cipher.encrypt(pt)

        cipher = AES.new(self.key_128, AES.MODE_CTR, counter=self.ctr_128)
        pt2 = cipher.decrypt(ct)
        self.assertEqual(pt, pt2)

    def test_loopback_64(self):
        cipher = DES3.new(self.key_192, DES3.MODE_CTR, counter=self.ctr_64)
        pt = get_tag_random("plaintext", 8 * 100)
        ct = cipher.encrypt(pt)

        cipher = DES3.new(self.key_192, DES3.MODE_CTR, counter=self.ctr_64)
        pt2 = cipher.decrypt(ct)
        self.assertEqual(pt, pt2)

    def test_invalid_counter_parameter(self):
        # Counter object is required for ciphers with short block size
        self.assertRaises(TypeError, DES3.new, self.key_192, AES.MODE_CTR)
        # Positional arguments are not allowed (Counter must be passed as
        # keyword)
        self.assertRaises(TypeError, AES.new, self.key_128, AES.MODE_CTR, self.ctr_128)

    def test_nonce_attribute(self):
        # Nonce attribute is the prefix passed to Counter (DES3)
        cipher = DES3.new(self.key_192, DES3.MODE_CTR, counter=self.ctr_64)
        self.assertEqual(cipher.nonce, self.nonce_32)

        # Nonce attribute is the prefix passed to Counter (AES)
        cipher = AES.new(self.key_128, AES.MODE_CTR, counter=self.ctr_128)
        self.assertEqual(cipher.nonce, self.nonce_64)

        # Nonce attribute is not defined if suffix is used in Counter
        counter = Counter.new(64, prefix=self.nonce_32, suffix=self.nonce_32)
        cipher = AES.new(self.key_128, AES.MODE_CTR, counter=counter)
        self.assertFalse(hasattr(cipher, "nonce"))

    def test_nonce_parameter(self):
        # Nonce parameter becomes nonce attribute
        cipher1 = AES.new(self.key_128, AES.MODE_CTR, nonce=self.nonce_64)
        self.assertEqual(cipher1.nonce, self.nonce_64)

        counter = Counter.new(64, prefix=self.nonce_64, initial_value=0)
        cipher2 = AES.new(self.key_128, AES.MODE_CTR, counter=counter)
        self.assertEqual(cipher1.nonce, cipher2.nonce)

        pt = get_tag_random("plaintext", 65536)
        self.assertEqual(cipher1.encrypt(pt), cipher2.encrypt(pt))

        # Nonce is implicitly created (for AES) when no parameters are passed
        nonce1 = AES.new(self.key_128, AES.MODE_CTR).nonce
        nonce2 = AES.new(self.key_128, AES.MODE_CTR).nonce
        self.assertNotEqual(nonce1, nonce2)
        self.assertEqual(len(nonce1), 8)

        # Nonce can be zero-length
        cipher = AES.new(self.key_128, AES.MODE_CTR, nonce=b"")
        self.assertEqual(b"", cipher.nonce)
        cipher.encrypt(b'0'*300)

        # Nonce and Counter are mutually exclusive
        self.assertRaises(TypeError, AES.new, self.key_128, AES.MODE_CTR,
                          counter=self.ctr_128, nonce=self.nonce_64)

    def test_initial_value_parameter(self):
        # Test with nonce parameter
        cipher1 = AES.new(self.key_128, AES.MODE_CTR,
                          nonce=self.nonce_64, initial_value=0xFFFF)
        counter = Counter.new(64, prefix=self.nonce_64, initial_value=0xFFFF)
        cipher2 = AES.new(self.key_128, AES.MODE_CTR, counter=counter)
        pt = get_tag_random("plaintext", 65536)
        self.assertEqual(cipher1.encrypt(pt), cipher2.encrypt(pt))

        # Test without nonce parameter
        cipher1 = AES.new(self.key_128, AES.MODE_CTR,
                          initial_value=0xFFFF)
        counter = Counter.new(64, prefix=cipher1.nonce, initial_value=0xFFFF)
        cipher2 = AES.new(self.key_128, AES.MODE_CTR, counter=counter)
        pt = get_tag_random("plaintext", 65536)
        self.assertEqual(cipher1.encrypt(pt), cipher2.encrypt(pt))

        # Initial_value and Counter are mutually exclusive
        self.assertRaises(TypeError, AES.new, self.key_128, AES.MODE_CTR,
                          counter=self.ctr_128, initial_value=0)

    def test_initial_value_bytes_parameter(self):
        # Same result as when passing an integer
        cipher1 = AES.new(self.key_128, AES.MODE_CTR,
                          nonce=self.nonce_64,
                          initial_value=b"\x00"*6+b"\xFF\xFF")
        cipher2 = AES.new(self.key_128, AES.MODE_CTR,
                          nonce=self.nonce_64, initial_value=0xFFFF)
        pt = get_tag_random("plaintext", 65536)
        self.assertEqual(cipher1.encrypt(pt), cipher2.encrypt(pt))

        # Fail if the iv is too large
        self.assertRaises(ValueError, AES.new, self.key_128, AES.MODE_CTR,
                          initial_value=b"5"*17)
        self.assertRaises(ValueError, AES.new, self.key_128, AES.MODE_CTR,
                          nonce=self.nonce_64, initial_value=b"5"*9)

        # Fail if the iv is too short
        self.assertRaises(ValueError, AES.new, self.key_128, AES.MODE_CTR,
                          initial_value=b"5"*15)
        self.assertRaises(ValueError, AES.new, self.key_128, AES.MODE_CTR,
                          nonce=self.nonce_64, initial_value=b"5"*7)

    def test_iv_with_matching_length(self):
        self.assertRaises(ValueError, AES.new, self.key_128, AES.MODE_CTR,
                          counter=Counter.new(120))
        self.assertRaises(ValueError, AES.new, self.key_128, AES.MODE_CTR,
                          counter=Counter.new(136))

    def test_block_size_128(self):
        cipher = AES.new(self.key_128, AES.MODE_CTR, counter=self.ctr_128)
        self.assertEqual(cipher.block_size, AES.block_size)

    def test_block_size_64(self):
        cipher = DES3.new(self.key_192, DES3.MODE_CTR, counter=self.ctr_64)
        self.assertEqual(cipher.block_size, DES3.block_size)

    def test_unaligned_data_128(self):
        plaintexts = [ b"7777777" ] * 100

        cipher = AES.new(self.key_128, AES.MODE_CTR, counter=self.ctr_128)
        ciphertexts = [ cipher.encrypt(x) for x in plaintexts ]
        cipher = AES.new(self.key_128, AES.MODE_CTR, counter=self.ctr_128)
        self.assertEqual(b"".join(ciphertexts), cipher.encrypt(b"".join(plaintexts)))

        cipher = AES.new(self.key_128, AES.MODE_CTR, counter=self.ctr_128)
        ciphertexts = [ cipher.encrypt(x) for x in plaintexts ]
        cipher = AES.new(self.key_128, AES.MODE_CTR, counter=self.ctr_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, AES.MODE_CTR, counter=self.ctr_64)
        ciphertexts = [ cipher.encrypt(x) for x in plaintexts ]
        cipher = DES3.new(self.key_192, AES.MODE_CTR, counter=self.ctr_64)
        self.assertEqual(b"".join(ciphertexts), cipher.encrypt(b"".join(plaintexts)))

        cipher = DES3.new(self.key_192, AES.MODE_CTR, counter=self.ctr_64)
        ciphertexts = [ cipher.encrypt(x) for x in plaintexts ]
        cipher = DES3.new(self.key_192, AES.MODE_CTR, counter=self.ctr_64)
        self.assertEqual(b"".join(ciphertexts), cipher.encrypt(b"".join(plaintexts)))

    def test_unknown_parameters(self):
        self.assertRaises(TypeError, AES.new, self.key_128, AES.MODE_CTR,
                          7, counter=self.ctr_128)
        self.assertRaises(TypeError, AES.new, self.key_128, AES.MODE_CTR,
                          counter=self.ctr_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, AES.MODE_CTR, counter=self.ctr_128, use_aesni=False)

    def test_null_encryption_decryption(self):
        for func in "encrypt", "decrypt":
            cipher = AES.new(self.key_128, AES.MODE_CTR, counter=self.ctr_128)
            result = getattr(cipher, func)(b"")
            self.assertEqual(result, b"")

    def test_either_encrypt_or_decrypt(self):
        cipher = AES.new(self.key_128, AES.MODE_CTR, counter=self.ctr_128)
        cipher.encrypt(b"")
        self.assertRaises(TypeError, cipher.decrypt, b"")

        cipher = AES.new(self.key_128, AES.MODE_CTR, counter=self.ctr_128)
        cipher.decrypt(b"")
        self.assertRaises(TypeError, cipher.encrypt, b"")

    def test_wrap_around(self):
        # Counter is only 8 bits, so we can only encrypt/decrypt 256 blocks (=4096 bytes)
        counter = Counter.new(8, prefix=bchr(9) * 15)
        max_bytes = 4096

        cipher = AES.new(self.key_128, AES.MODE_CTR, counter=counter)
        cipher.encrypt(b'9' * max_bytes)
        self.assertRaises(OverflowError, cipher.encrypt, b'9')

        cipher = AES.new(self.key_128, AES.MODE_CTR, counter=counter)
        self.assertRaises(OverflowError, cipher.encrypt, b'9' * (max_bytes + 1))

        cipher = AES.new(self.key_128, AES.MODE_CTR, counter=counter)
        cipher.decrypt(b'9' * max_bytes)
        self.assertRaises(OverflowError, cipher.decrypt, b'9')

        cipher = AES.new(self.key_128, AES.MODE_CTR, counter=counter)
        self.assertRaises(OverflowError, cipher.decrypt, b'9' * (max_bytes + 1))

    def test_bytearray(self):
        data = b"1" * 16
        iv = b"\x00" * 6 + b"\xFF\xFF"

        # Encrypt
        cipher1 = AES.new(self.key_128, AES.MODE_CTR,
                          nonce=self.nonce_64,
                          initial_value=iv)
        ref1 = cipher1.encrypt(data)

        cipher2 = AES.new(self.key_128, AES.MODE_CTR,
                          nonce=bytearray(self.nonce_64),
                          initial_value=bytearray(iv))
        ref2 = cipher2.encrypt(bytearray(data))

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

        # Decrypt
        cipher3 = AES.new(self.key_128, AES.MODE_CTR,
                          nonce=self.nonce_64,
                          initial_value=iv)
        ref3 = cipher3.decrypt(data)

        cipher4 = AES.new(self.key_128, AES.MODE_CTR,
                          nonce=bytearray(self.nonce_64),
                          initial_value=bytearray(iv))
        ref4 = cipher4.decrypt(bytearray(data))

        self.assertEqual(ref3, ref4)

    def test_very_long_data(self):
        cipher = AES.new(b'A' * 32, AES.MODE_CTR, nonce=b'')
        ct = cipher.encrypt(b'B' * 1000000)
        digest = SHA256.new(ct).hexdigest()
        self.assertEqual(digest, "96204fc470476561a3a8f3b6fe6d24be85c87510b638142d1d0fb90989f8a6a6")

    def test_output_param(self):

        pt = b'5' * 128
        cipher = AES.new(b'4'*16, AES.MODE_CTR, nonce=self.nonce_64)
        ct = cipher.encrypt(pt)

        output = bytearray(128)
        cipher = AES.new(b'4'*16, AES.MODE_CTR, nonce=self.nonce_64)
        res = cipher.encrypt(pt, output=output)
        self.assertEqual(ct, output)
        self.assertEqual(res, None)

        cipher = AES.new(b'4'*16, AES.MODE_CTR, nonce=self.nonce_64)
        res = cipher.decrypt(ct, output=output)
        self.assertEqual(pt, output)
        self.assertEqual(res, None)

    def test_output_param_memoryview(self):

        pt = b'5' * 128
        cipher = AES.new(b'4'*16, AES.MODE_CTR, nonce=self.nonce_64)
        ct = cipher.encrypt(pt)

        output = memoryview(bytearray(128))
        cipher = AES.new(b'4'*16, AES.MODE_CTR, nonce=self.nonce_64)
        cipher.encrypt(pt, output=output)
        self.assertEqual(ct, output)

        cipher = AES.new(b'4'*16, AES.MODE_CTR, nonce=self.nonce_64)
        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, AES.MODE_CTR, nonce=self.nonce_64)
        ct = cipher.encrypt(pt)

        cipher = AES.new(b'4'*16, AES.MODE_CTR, nonce=self.nonce_64)
        self.assertRaises(TypeError, cipher.encrypt, pt, output=b'0' * LEN_PT)

        cipher = AES.new(b'4'*16, AES.MODE_CTR, nonce=self.nonce_64)
        self.assertRaises(TypeError, cipher.decrypt, ct, output=b'0' * LEN_PT)

        shorter_output = bytearray(LEN_PT - 1)
        cipher = AES.new(b'4'*16, AES.MODE_CTR, nonce=self.nonce_64)
        self.assertRaises(ValueError, cipher.encrypt, pt, output=shorter_output)
        cipher = AES.new(b'4'*16, AES.MODE_CTR, nonce=self.nonce_64)
        self.assertRaises(ValueError, cipher.decrypt, ct, output=shorter_output)


class SP800TestVectors(unittest.TestCase):
    """Class exercising the CTR test vectors found in Section F.5
    of NIST SP 800-38A"""

    def test_aes_128(self):
        plaintext =     '6bc1bee22e409f96e93d7e117393172a' +\
                        'ae2d8a571e03ac9c9eb76fac45af8e51' +\
                        '30c81c46a35ce411e5fbc1191a0a52ef' +\
                        'f69f2445df4f9b17ad2b417be66c3710'
        ciphertext =    '874d6191b620e3261bef6864990db6ce' +\
                        '9806f66b7970fdff8617187bb9fffdff' +\
                        '5ae4df3edbd5d35e5b4f09020db03eab' +\
                        '1e031dda2fbe03d1792170a0f3009cee'
        key =           '2b7e151628aed2a6abf7158809cf4f3c'
        counter =       Counter.new(nbits=16,
                                    prefix=unhexlify('f0f1f2f3f4f5f6f7f8f9fafbfcfd'),
                                    initial_value=0xfeff)

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

        cipher = AES.new(key, AES.MODE_CTR, counter=counter)
        self.assertEqual(cipher.encrypt(plaintext), ciphertext)
        cipher = AES.new(key, AES.MODE_CTR, counter=counter)
        self.assertEqual(cipher.decrypt(ciphertext), plaintext)

    def test_aes_192(self):
        plaintext =     '6bc1bee22e409f96e93d7e117393172a' +\
                        'ae2d8a571e03ac9c9eb76fac45af8e51' +\
                        '30c81c46a35ce411e5fbc1191a0a52ef' +\
                        'f69f2445df4f9b17ad2b417be66c3710'
        ciphertext =    '1abc932417521ca24f2b0459fe7e6e0b' +\
                        '090339ec0aa6faefd5ccc2c6f4ce8e94' +\
                        '1e36b26bd1ebc670d1bd1d665620abf7' +\
                        '4f78a7f6d29809585a97daec58c6b050'
        key =           '8e73b0f7da0e6452c810f32b809079e562f8ead2522c6b7b'
        counter =       Counter.new(nbits=16,
                                    prefix=unhexlify('f0f1f2f3f4f5f6f7f8f9fafbfcfd'),
                                    initial_value=0xfeff)

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

        cipher = AES.new(key, AES.MODE_CTR, counter=counter)
        self.assertEqual(cipher.encrypt(plaintext), ciphertext)
        cipher = AES.new(key, AES.MODE_CTR, counter=counter)
        self.assertEqual(cipher.decrypt(ciphertext), plaintext)

    def test_aes_256(self):
        plaintext =     '6bc1bee22e409f96e93d7e117393172a' +\
                        'ae2d8a571e03ac9c9eb76fac45af8e51' +\
                        '30c81c46a35ce411e5fbc1191a0a52ef' +\
                        'f69f2445df4f9b17ad2b417be66c3710'
        ciphertext =    '601ec313775789a5b7a7f504bbf3d228' +\
                        'f443e3ca4d62b59aca84e990cacaf5c5' +\
                        '2b0930daa23de94ce87017ba2d84988d' +\
                        'dfc9c58db67aada613c2dd08457941a6'
        key =           '603deb1015ca71be2b73aef0857d77811f352c073b6108d72d9810a30914dff4'
        counter =       Counter.new(nbits=16,
                                    prefix=unhexlify('f0f1f2f3f4f5f6f7f8f9fafbfcfd'),
                                    initial_value=0xfeff)
        key = unhexlify(key)
        plaintext = unhexlify(plaintext)
        ciphertext = unhexlify(ciphertext)

        cipher = AES.new(key, AES.MODE_CTR, counter=counter)
        self.assertEqual(cipher.encrypt(plaintext), ciphertext)
        cipher = AES.new(key, AES.MODE_CTR, counter=counter)
        self.assertEqual(cipher.decrypt(ciphertext), plaintext)


class RFC3686TestVectors(unittest.TestCase):

    # Each item is a test vector with:
    # - plaintext
    # - ciphertext
    # - key (AES 128, 192 or 256 bits)
    # - counter prefix (4 byte nonce + 8 byte nonce)
    data = (
            ('53696e676c6520626c6f636b206d7367',
             'e4095d4fb7a7b3792d6175a3261311b8',
             'ae6852f8121067cc4bf7a5765577f39e',
             '000000300000000000000000'),
            ('000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f',
             '5104a106168a72d9790d41ee8edad388eb2e1efc46da57c8fce630df9141be28',
             '7e24067817fae0d743d6ce1f32539163',
             '006cb6dbc0543b59da48d90b'),
            ('000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f20212223',
             'c1cf48a89f2ffdd9cf4652e9efdb72d74540a42bde6d7836d59a5ceaaef3105325b2072f',
             '7691be035e5020a8ac6e618529f9a0dc',
             '00e0017b27777f3f4a1786f0'),
            ('53696e676c6520626c6f636b206d7367',
             '4b55384fe259c9c84e7935a003cbe928',
             '16af5b145fc9f579c175f93e3bfb0eed863d06ccfdb78515',
             '0000004836733c147d6d93cb'),
            ('000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f',
             '453243fc609b23327edfaafa7131cd9f8490701c5ad4a79cfc1fe0ff42f4fb00',
             '7c5cb2401b3dc33c19e7340819e0f69c678c3db8e6f6a91a',
             '0096b03b020c6eadc2cb500d'),
            ('000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f20212223',
             '96893fc55e5c722f540b7dd1ddf7e758d288bc95c69165884536c811662f2188abee0935',
             '02bf391ee8ecb159b959617b0965279bf59b60a786d3e0fe',
             '0007bdfd5cbd60278dcc0912'),
            ('53696e676c6520626c6f636b206d7367',
             '145ad01dbf824ec7560863dc71e3e0c0',
             '776beff2851db06f4c8a0542c8696f6c6a81af1eec96b4d37fc1d689e6c1c104',
             '00000060db5672c97aa8f0b2'),
            ('000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f',
             'f05e231b3894612c49ee000b804eb2a9b8306b508f839d6a5530831d9344af1c',
             'f6d66d6bd52d59bb0796365879eff886c66dd51a5b6a99744b50590c87a23884',
             '00faac24c1585ef15a43d875'),
            ('000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f20212223',
             'eb6c52821d0bbbf7ce7594462aca4faab407df866569fd07f48cc0b583d6071f1ec0e6b8',
             'ff7a617ce69148e4f1726e2f43581de2aa62d9f805532edff1eed687fb54153d',
             '001cc5b751a51d70a1c11148')
        )

    bindata = []
    for tv in data:
        bindata.append([unhexlify(x) for x in tv])

    def runTest(self):
        for pt, ct, key, prefix in self.bindata:
            counter = Counter.new(32, prefix=prefix)
            cipher = AES.new(key, AES.MODE_CTR, counter=counter)
            result = cipher.encrypt(pt)
            self.assertEqual(hexlify(ct), hexlify(result))


def get_tests(config={}):
    tests = []
    tests += list_test_cases(CtrTests)
    tests += list_test_cases(SP800TestVectors)
    tests += [ RFC3686TestVectors() ]
    return tests


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

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