ÿØÿà JFIF 

  
 
  ÿÛ „ 
 !.%+&8&+/1555$;@;4?.451
4,$,44444444444414444444444444444444444444444444444444ÿÀ  á á
" 

ÿÄ   



           
 ÿÄ ? 
    
 !1AQaq"2‘¡±ÁðBRbrÑá#‚’¢²3S CñÿÄ 
 

             
ÿÄ ! 
 
 
       
!1QAa‘2ÿÚ 
  ? 5˜Z¯V¦cø)›t/? z¨±>Õ5€¶‹Á¤·¼z¼Ü¬+ñ®v¤¨_ˆR­BFn©—˜ý®ç̝P8gýt·ÉSTŦˆìät?þé¼íìN/Þa)ì–í6ô…
Ï¿øÃj´¿KÇü]ÿ ªô¹-eKànëÕHTx}ýSÜ›ÿ ”7Ø×&µ<¦  ¥ÑO¶[Ù¯ä¨ÞÃÿ PZ-¬;#õ|•
oaÿ ©CìÞz3˜öː/¤­ñTûIØ}š^   mÓ%ªxˆ¥ÉŸu=Z+ISe¿45™¼u;ú&WØ÷€æßQ™®{|
íx*TC“#ZŠìZ§²‹ 6pv…³¿¡äª*áZÐ%ÒOáˆo"x«OHk
w±æ+¬V(kMúŸ5Vö«$ ÁrÏbàb57/luR ¸ÑÛj Òµì`Ðœq­û žICÀ
Ê•©4€Âcà¨Ï€O´<èÐ:›ù(Ë^L8þ‘ÍÌ#¸Ð_Ì©ÙK(Öz 4¬û+¸;ü’V’84‘¬ÃŽ:[â‡ÔÌáõp¢~§ªlæ£ö{®G>J¼"°‡7¯ÆÉèßû ‹É‹§ÁòÃýâßî
^ƾÙõ‹×óH#«LP½ïX=xÑÍ$|W?•~•îëÔ©ª‹
{ÝT…Kÿ ”hûâá)J*ö˜–ÔU;iÇ€/ ÆþjóZ\ýwØ=Ìm
ºèËL9 ýè
Æð/¨’¥öo=nË.%Îì   ŽÕ¯È|{Oj²ƒE6e/ßdÄõ²Ìâ1O®ò×TsəԸhOMýíMˆ¿¼H˜l²,7Â¥#MF/Úf°Ö½± ¸–dr‹NýÊ íjqx{œÉ ä-È    ¦
øÄër¨q°ð
†nцýÑÄÆ’mä…n<0È™;ÁÝá¯ÁZƒ7FÀmì­ É&9ˆîéi¶ùN§Y•ÃZãAâ?•‡©‰ , ó¾IŸŠc1 4â&y­&pŠ­6;M À 0¹qç»p.á …ŸÅáK@<u %Ü6ÓtIÌpÓr»söfeÁ0O…­´Kƒ&ñ™\©<+,~)‹
ºHÐ*×µ&†ž‘Æ÷ÚŸ
1ßjC5Oh´‡›

Ø×ë æâ“Þà

ÒT]§n{ºöB³ ¦ ̹Â8Êï¦MÉ<„¨s¹¶ì7Ì”æR$Ncà! /éþäRM÷Gƒ¿É$
¦oà>%6·y6ƒ‰3?”úºŽ‰éX5ªPT §µ!=Mž«Ú½‹ÅgÂSâÉaþÓoö–¯ÁÔìR>5éÿ üs¶ÆUcÌ  kÇR
]ÿ ù¬¼«VŽ;Â|‡~¢¦”ÏÅ°æ
{L™Õ°Óv¹ò¸írŽ¡×¢CÃ!íVÕ {¶»sŒNPg/
"uÕbkm²“$ďå¿é¹§°½æz¯6 †s¿!s–wÚÝ“™Œ°.ûj>·+™Òa…©Œ&rÝÎtÛë긪Ît’LAVp%c Úý[ÄzJ¾ÇàXXç@˜ó<êL]·T˜¾¥1Ó©V‡g´æ½¦Ý@¹óø!_@´ÞâSÁ —S3™•& ]@JHÚý©ZŽ €×æÔr»Áf!‡yÞ4Mv*èÓã_{‘åóUuљØ«Oïé*®EvÑ
Œ÷‡U \"㪒ÍK+À 4“M¡ï:0¥5í!'<@î´”>Ç»&Z–ïCCV˜Ì5Šo&îhè.žû
|ÓK©h$s6KìŒëã)¹hI¦GïOåóI;ììü#É$Š0…Ææ¥TØ.5­¾gn´ “ÂÖ\:hœ89G)J@„}œ:’Ò{/Š"¦_Æ×7Æ3VÇŠÊa]ÚŒÙ€Ä–=®uÁßâACZƒ§§£Qnâ:«,×{tyø¬iÛcœÜÄ€H½ÄÍCk´÷šß
.W'b¤Íåh]÷€=,Žv×cÚEÚHXJX¶îo¨FÒtèöŸ>ªª6[J®Fµ£sGÁeqõfe\íjÒÐïÄÐGˆe1Ø‹.Ø”‘Ëuø
Y­ˆÜŽG|zùªüMpDnQWÄ”%JŠ™)â*p@Örš«ÕT2Ð%ˆG#ª„
·¤!°ŸOTÂT¸aÚ%4&h™LµšØüÐ.F¿²ÐÞ_Ç‚¾ÅÃaÜ÷09Æ 
q€öy˜v‡85õN÷]¬äѼóS{°_MŽ¬úÔ#°Ç¸0åÞè2ëôPcvÆw9®ií1Ä8F™˜à‰´+‰Ik1òÝ7“Ñ×ÒsÝ\x‚h`ÞÑ`ó"|µEcý£n˜h`}GÞ  !±ù²Ápü²
ß6
0ïi󜵩SÈÇ7˜-ÕURO˜¦´f$ªž-Í6(œ}<„ éc øs]ŽŽ„*—¾
ìdŽ„)méª\¿êÎIg¾ØÞ~I#C/¼¼´EÁÈŽi8“©õådô·>euä ƒ'Ê×लR1ÉJE1ÐAát`t;ÇР%Ý<‡¥„ÍÆ`×Oyó)õiI€ñQaŸ4Ûù\áàaÃÔ¹HÃu¹*k€¦<„eS‡&õÏ
B!ŽhüÞ`yj}mªf×\¿
Ç~æ­9‡û\՞Ǖg²1Žû5V7 !àöšm°
c`ܬøÇìµÒ'P"?…´Ö,"§^•õŽ¨sÔ)6˜sæéÍR¼
ò|Sl”‹7 nPW

Gòú÷½§O¯‡„l¡kSÞŒr½PÊ@æ¢pŽ-mÿ #Ÿ˜Àº¶Áä¦;ïÔæ$1££`“Õ>„—·ž)ß
ð
³ñ#Ï Ô$¶œ‰ÊE‹À;÷º
¯«P:Ñ”8–IÊtpÞ3ª“>ê“þës4ò2OÏÕ­±zô†Õ§‰.÷ä¸;¿˜“'œ›žª}«Œ{ª±Ì 9ÔóÞÕ‡0
$íWV3Üì¬
—@kÝ4@¿r¼±½¬™›?øØæ´'Áé®CË3-g$˜ö‡×auÚi´Žp/êÛæF›Ú2v‹ã¿¿,nB1̨ƃqÞa5͝@&Æû“él÷ \C²½UÍc ¯k×¢U
ÖéQå™—-r    wô ÞÏ<Ò=&=ÿ Ôê Òêˈt,i—;LîÜ á¸*ÚÃ1$êL•LÍ <É)ýÐà’
;F™{ƒ™˜€&'}‚ãÄK`¡ÞT@I;®žZóè‚s’7®°›+§O­Åq©é»²9<Ô
J ¼9O’HL»Ùïì¸rk¼Ž_ý‘TŸu[²ßÚŒ·ü÷B%¯E ŸÔX5êO´Ç•€’I0 É<mÆÈJoúáõóQâØòÙaÙt:  ·=|Ôaz]a1cÉŸ1
4˜à3΍}GFøí7/B«vεŕL=Ðr1ÕšnwH›óÞ¢ºö{)´4€æZç^ÿ yÑ:_([¿ipqQÊ^âÆe;»½“¦º|¢ÀTçèrú1”óTÃ’u¦CG¤ ¡
Š­7ë

·i“¿z»n
ö¼±ù^ö<‹çu7¸ÈlvZðÛAUXje•
dLÞH ÚosÇr`È™‡pÊeÇ4@x7´)ö†Ótœ~i‘Ï[x@äUÃæ­m·e´x
°t¸·²5'žªža   =ÖÌåzϘ'-´ˆpž3§ò‡k  Ý'‰ýÑï¦3ºdè“{eiÔõNkîšECEΠ¥ÃT9ãqÃâŸîɐ8z \?€    >JX` 
ñ¹õ%;µŸD‘«´€àwÒ™UûئžÖö\×®×´8 ½‡ºÐÆÓ§?Àkmœ=;d5*@-ì0F Rªýš[Ü6âö̃ڸr*KA9· u*µæ£?U¸Âêí†8@¦X4 e-ò„0s{ HâUpU?¼mñRa°®a%Ð'tÉ×’\¾ÊÉ]t›h>·(Ë@R¼¡Ãt h}’O÷au<+nT…Ö…MӐ??Óe95 q>í/;&JSû °¯ÊéÞøƒ*Ã2½Ài&:nôUl=¾¿5eˆ3”ñc|Ú2V”>„»&eE;«ÚäC
p¢Ûúy 9š[ŒÌx¼擼A&DåÒ¯ˆ¤ÀÌ;"˜ÏQä¸åhÊ}Ûq«Û0WžÒ|»€ø®öCm5•\ÇÀ§Pe3£]0ÃàLDÉ‰1øªxjgwT‚÷¿LΨK‹›ùs—xˆÜ±µ
kæ¸f‰‰ÜGk/LÛØ6d9ò¶ùA{ƒA3š/¬D¬khÓk‰`˜"㯒r¿±Óã jx‡°e}<Ñø\3y:'À•/h½Í€Ç4~g ?Û(¼]v‘ªlKÎâ~?O‚W%{Ì:“'©úNq¾›úo(X’¥¯ˆ
nFê{Ç€ü?º'ë
ø‹ì
Þ09ŒÌç9Æ —ËC`j@ÓÄ(+a‹un¸#ÂꟋ{K`‘ÑÍÍ'à´»/Û,KW;Þ4²þð ï Nm|~fGÏ(…³Ã)«1ö­Õ
¥‡¨©ƒÃ™ü-s=à=U66Ï«Ýc蓦W¹íž®›nÔ%êÇìŒ<#Ü×84ån®Ð ÒåOC`  ñânÑs‡¢ç 1õ%Îhì½Ã½® e:ݼUZo
™`  
ÅZŸŒÊ«ê1ÏÄo$q¹Þ€©ˆhÐÉä¯ñ[!…Ú˜àJ:x2$Íß&PåT£6ç—
‡Í*4Ýšçjÿ ‰É nófÐ ó(L5C•åÆ\rMÒ@ò
}y-W}™üýVù—ú¢=Ù”c®‘< M ž
´Phr¦©TD ‘ù.$´÷O‡‘V2Æò.=IUŒ=ž‡â¬i™aþÓåÙ?òUø'ØÖ•.~* šTŒ!•-×áºTâ®ä#õü'´ eýlYÅÓeÕKÂrT"CÚ@u!Óxƒ{š3€}1¿(r}%«nËamjÑ%ÑNEò
v  ˜à  σöK³,*º.àzù¨™Ó ÚçâU¦*¿ 9{%Ö¹ njûdaXöb)  kÛƱûÓ\°M7ˆÂ=û›ç¿Ã‚­V»Cg–8ÙêE-j)k$º`Ã-ùEýeBÆÇ]c¡°ñty&Òd0nõ'¡W+ƒ*|–ø<K\%¦cÏÄ#N,Úú‘¤òÒÛõ ’¶§‰Ì
ú•dçb31Ð\7‡ëÚw82
‰KÝkÚñ'¢Ž…[&¼ÌAÔzHàP *اoßreÁY¥Ñ¾ãE|&QbKg]ã„þê*b;R³Öi‹  ±î$£ÈTm¶k÷ˆ
¦»Ù¹i¦¨6 h%Á'Ú
J   \F±â+‹b/Å9ñå5Àë­nˆRv«¯#„&î„$º’@:‘Ôrø+,àq‘秬*Úg´>µFa\GQªEAÔp5\Ǽ·¼Ç8·õ -â§Ú[
‡
uZeÖ 3}×d'+¹:ð+K†Û®s!Ï$úe€<Û”x)1»a­¡LC]¸µík…ÚàA»AYº{†ªS[¦5HÒ7ù
--,ísòDØ€èk   ÞÀîÜò@â(  ËNˆë›4ô½•/¦o‡€Û7
ê•ÆêòðÜy
'Án½µ á˜ݦ  ndeo…[ì¶Ê,¥R³Ä=À±—–ß;£™´ñSâ*g§”ïaið‘Jå~™ÓÞß³Õ¢»8x埒²52>AÊb&-÷\7´éÄù€T˜,w;3{ï˜k…à¹ÄqÀ«œ{
€\
ˆ¾[´¨јr &Úé„Ívˆ±8†¿]|¬ņ4I×pÞS1ÈÖz‰#Ìv‡G!YNògñ:màTz¢Ý1ô©^O=~ë|5Bã™ç•¼µõ•bÆ@úÕS¬ÈŒ#¬zünrŸ
û”
Z²•ï›èðV"ÁHÚý©wÝ €7¼Ìu1hÑa3Éä û f$o¿É ™Ú›ÝçnpÒ3äÌ3†Í§,Äï]$‰/pê†«À¼
¸e9­Æê_C]žƒ·ý·frÁN«,E=›Çq
-‰öŒ:aÏ¿±í&£Í:-}
84‘ÿ eƒQÑeëSsuiA
³g㟥ú£?ÿ ʼn*”“÷aühe:ÊWa@ÒÞk±eØ]
F Ô—r.åä˜@ö¥ªZoÐýYL·¥S²G/‡ñ
<~*ZÆ´è>JlòàÛƽÿ 窘ìGN¢:I®KšJp/`íIÁÀõ#Ä-€ö­šµŒoF4|ÆQØÆ@Ì|£Ô…¢À{9˜è½Üó›€ôYÒÎYsið;ís¤€à²ˆ‚4qÉVŒI$  ‰"°   æµ8cXGjœˏ¡Aâý•ËÜ¢ûïe·çLx']á"oÅÎê3¯Ç—¹”ó0nå‚âg{Œñ>
S´˜îè°g238‚ãköÝfÚd´6Ò€;ò÷±¢™¼›º¢Æ'¥Ðx'e¬ç
]bÈÆV¢ó‹kýBO
ðÊâ$Ÿ!×T
3Mýמ
žìٍàÌü‘8÷€àæØ8æ©6‰©L´«…oãpð„~Çk‰!ñ;‹”ÛžÍ àž±z Ÿôû øŸÝužÏ;ÿ #|u6™Þ¬ÚˆÐõA4¶â|ôl|Ê2ŽÇ¤ÝÅÇY.<#Aí.k§hóF‚”Y;
M½Ö4hŸ4&›­¿tès´%FìL¥£Ãk‰ÇT¤haÁ¤ÚxfÉ`ÑìË›>i 3t‚:,–+^÷´–{Û–Nxi"x‘Ûg
î¨>¥Õ܁ùZH,2Û“:8xÊ¢Çí9.É-Ìâã-=çjwµS˜dütžçwýGòú®®ûº_ˆýx$–¡ãøO
EÚÛÏ÷R„×w+3£Á£öUMyR²¹âŒ°š›¸Ñãò9§Ó_Dl+Ùßc›úšGÅÌc†Ž!Ko=¶.‘Îÿ c²(2®V mª.ÿ ¹B›¹å ù„öŸSV>™ü¯$y:G¢Z×àøúdî¹û­·ýÇ´:•c LÍõi_‹ö+ÎæGÊè>OŠ•äž´§Þ{X}¨1ÚTc›»Qþ•êô°t¿OP?eæ~É{5]•ÙR£r5†nZ\ã@
&îJõ ¾àC°þV>fé¥/ü5ñÊIº_é5;e­h<@
Ä&æÃëE%;X,ÒãÆÞ`Oò¦kŸm#˜!ÀyÄ¢|
óLšò¥Ä`
¶R=|ÈCâh5ò3DˆïF†ðÒ#ÅìÛœ?¸yhBãœí
ZxßÎÄhºRK„`Þödvײ™ÀÈÑÒgŒuYw³%†ƒÓzõ ÖÏp‚dH®¦A´ù§»ÓÇMæ~)ˆð‡û:ù&Ä •vGD´À 
n
Ý
‡¼Ö8Fö   óáà£~Ë¥x`oK|Ä?fxiØü%pìR>éò+Û±éÎ>núlFŤ'tq8LZÏvÃ?„¡ß±È⽆¯³íü@x|PöUäèØã¡ð‚ŒAìÏ"vÍwóŸÍ{ ý0.z    È•Ö{,N¡£¡ŸKÕÙž>Ýœþ ÍÀ<n^Àïe€Þgn¹”ÜiQê
9Ú±‡„è]ËA¿‚MJìiÓxŒn-ÄS6!ÓæÑû*jÎWøìšÇ뙦gj~+?\,Ö7ÁÕÊ”G™q6TF)óCç<ÓšÂUé†gW=àà“hóR³ÊQì<!÷ÇpR1¯u„De,è­vvâDß~žHå‰ú£Kìní¢ÐçÅÄÅ¥Ü÷
±ÃìÇžûƒz\þÞ¨-•‹
€

¸+¶n¿^
?†[ÖWóÒX¸,0Ø:l?‰Âý«ÿ ·Dc+fÔ[ƒ›ûªšx«kæž1KI…<#'nž¶\±íÎ8¤ìK@’@J¥v)º[Ž±Æå´¼
½Ý¡ç¯ÐO¥ø®è•Óȱ߿wša©“œt‡4îyªœ&+1ÏØ:‚æƒ=/ꎔ`hm
“=©‹]°g}ì€DgUƒ8¤qCˆãáÅ,‡Ô¬ñ10HÑDÂbáÂÿ Œ»v·:uòB6»áp‰>°<×EA!Å‚D™IúOÍ
¡>ôG}Â`ÍßkÜL™Ž  Þð™
{IøF²
¹òQ3&!ÃÂÞz.d&Ï-sH¸,Ôõ˜ŽP€
77ˆÝ¼ÊëÜw   =cÕ
Ú,ØÐ5ÎYÐ)ì´öœgŒ[¤
ßv㙑8心>h]§µháYš£²ºÑ.{Ï7Sð•?´~×SÃKýJÛ˜
™Íäiúu<µX¶1õ^kâçIÑ£sZ4h>j*ÔšD:4­¿_ ÷¸
Õxæÿ ¸?Mù _•­ÊÐ ä ÷ý ÑwL
œ­ïnTkÛUÍN©ë:¦fV ¶ÜÔÜMªÅâA½–¿R×TXš-%iTÊT•‡Ù‚JôϐZxWÑè‰f‰òG º
×Õû2aZ7OU3[“×AT–ÞŒ…-‘¤”Ì 
ì&(ˆ¿­•ƒkï’:ðY¦W‘Å)“†‘˜³Åtcø˜ñTÂwÚÇ4
|üLÇªí–v-
qˆèU
qPE.†â‘˜µ Æ,ÐÅs]8¾„oúÑ i>ÜxxÈó)ƒ ´æÁâØ$À‰vžŸf$Ž|ãw;ÀÁIJ»b`
{¦Ó¤Ú$©YÀ‘n@Óïž«9J¼êG   m¤
ܯ¹ÌW4€ÐÒÅÛ‡#褕Ÿn-?í|с¥÷Ú¹¬'´ÞÜ9ÓK`hê£SÄSà?7—Wí_´…óB›»:=Ãïq`<8ñÓŒÑlú2d¬ê³£hÖ[l|$vÝro~'R®‰§°ñmY ͧäP
|PUª¹·:3Œ[Û{Xÿ ºâ@‚W–Äé u‚ ¯´*=íή.pûÒdt @
G‰¬ s¸    ëÉücr ÞæѨÊ@>¤¢Ö±.Þ'¯°ÌME[YéïĵÂCå½
Ué©Áû'Ê9%eÔðNU”ë‘ÌsD3/®+UI˜9h.WC”
빓$#:pz:YÓ ¿xž* ³$Í +$kñAŠ‹†¢
Uê>¸)_š¬÷©ßAÂÔb9ÇU ¯¾
á•9¯ÏÏ÷O÷¼¼Fähal1‰3Ì[Ïr•´UCksNÐ]R‘¸¥H+§Šé†c©vÖÞ0iÓ76s†î!§=ß
¼~Ô'°Ãmäoäš³ªøi1úÉ)³yV8CLÄØÁ‘WYïi€H6ÖÑiámø^ÈY´°Ñ7¥Û*—Ñ©L«Qƒï—Ùrÿ ›£Ð*š¸ˆL©ˆ$ˆ ÷¾D§9È®«qbqC)–ˆïv´çñsÑVT­Ø, <àïºÀO«Jý·õ 
àfPìð  .wFšir´þ’2_Y
*Æ€x\«
ì€9š@ Ž|F⇥ˆkZ@hÖÄ0t¿-<“‹qµ¾*ZL¤Ú)&BJpÓF5=$„at*Zš$’ÑtdûÝRI1    2Ž‰$€$I$#‰SÞ’H
ë¬ï;Á$¡t$’`<(ñÇt)$‡Ð.Êf¢X’Kt=Éé$‚ˆªè¢oÝëòI%Rgcª÷ŠyI%¡‰ÿ !ñ)´õ $¤ Ô’IIGÿÙ# coding: utf-8

"""
ASN.1 type classes for the online certificate status protocol (OCSP). Exports
the following items:

 - OCSPRequest()
 - OCSPResponse()

Other type classes are defined that help compose the types listed above.
"""

from __future__ import unicode_literals, division, absolute_import, print_function

from ._errors import unwrap
from .algos import DigestAlgorithm, SignedDigestAlgorithm
from .core import (
    Boolean,
    Choice,
    Enumerated,
    GeneralizedTime,
    IA5String,
    Integer,
    Null,
    ObjectIdentifier,
    OctetBitString,
    OctetString,
    ParsableOctetString,
    Sequence,
    SequenceOf,
)
from .crl import AuthorityInfoAccessSyntax, CRLReason
from .keys import PublicKeyAlgorithm
from .x509 import Certificate, GeneralName, GeneralNames, Name


# The structures in this file are taken from https://tools.ietf.org/html/rfc6960


class Version(Integer):
    _map = {
        0: 'v1'
    }


class CertId(Sequence):
    _fields = [
        ('hash_algorithm', DigestAlgorithm),
        ('issuer_name_hash', OctetString),
        ('issuer_key_hash', OctetString),
        ('serial_number', Integer),
    ]


class ServiceLocator(Sequence):
    _fields = [
        ('issuer', Name),
        ('locator', AuthorityInfoAccessSyntax),
    ]


class RequestExtensionId(ObjectIdentifier):
    _map = {
        '1.3.6.1.5.5.7.48.1.7': 'service_locator',
    }


class RequestExtension(Sequence):
    _fields = [
        ('extn_id', RequestExtensionId),
        ('critical', Boolean, {'default': False}),
        ('extn_value', ParsableOctetString),
    ]

    _oid_pair = ('extn_id', 'extn_value')
    _oid_specs = {
        'service_locator': ServiceLocator,
    }


class RequestExtensions(SequenceOf):
    _child_spec = RequestExtension


class Request(Sequence):
    _fields = [
        ('req_cert', CertId),
        ('single_request_extensions', RequestExtensions, {'explicit': 0, 'optional': True}),
    ]

    _processed_extensions = False
    _critical_extensions = None
    _service_locator_value = None

    def _set_extensions(self):
        """
        Sets common named extensions to private attributes and creates a list
        of critical extensions
        """

        self._critical_extensions = set()

        for extension in self['single_request_extensions']:
            name = extension['extn_id'].native
            attribute_name = '_%s_value' % name
            if hasattr(self, attribute_name):
                setattr(self, attribute_name, extension['extn_value'].parsed)
            if extension['critical'].native:
                self._critical_extensions.add(name)

        self._processed_extensions = True

    @property
    def critical_extensions(self):
        """
        Returns a set of the names (or OID if not a known extension) of the
        extensions marked as critical

        :return:
            A set of unicode strings
        """

        if not self._processed_extensions:
            self._set_extensions()
        return self._critical_extensions

    @property
    def service_locator_value(self):
        """
        This extension is used when communicating with an OCSP responder that
        acts as a proxy for OCSP requests

        :return:
            None or a ServiceLocator object
        """

        if self._processed_extensions is False:
            self._set_extensions()
        return self._service_locator_value


class Requests(SequenceOf):
    _child_spec = Request


class ResponseType(ObjectIdentifier):
    _map = {
        '1.3.6.1.5.5.7.48.1.1': 'basic_ocsp_response',
    }


class AcceptableResponses(SequenceOf):
    _child_spec = ResponseType


class PreferredSignatureAlgorithm(Sequence):
    _fields = [
        ('sig_identifier', SignedDigestAlgorithm),
        ('cert_identifier', PublicKeyAlgorithm, {'optional': True}),
    ]


class PreferredSignatureAlgorithms(SequenceOf):
    _child_spec = PreferredSignatureAlgorithm


class TBSRequestExtensionId(ObjectIdentifier):
    _map = {
        '1.3.6.1.5.5.7.48.1.2': 'nonce',
        '1.3.6.1.5.5.7.48.1.4': 'acceptable_responses',
        '1.3.6.1.5.5.7.48.1.8': 'preferred_signature_algorithms',
    }


class TBSRequestExtension(Sequence):
    _fields = [
        ('extn_id', TBSRequestExtensionId),
        ('critical', Boolean, {'default': False}),
        ('extn_value', ParsableOctetString),
    ]

    _oid_pair = ('extn_id', 'extn_value')
    _oid_specs = {
        'nonce': OctetString,
        'acceptable_responses': AcceptableResponses,
        'preferred_signature_algorithms': PreferredSignatureAlgorithms,
    }


class TBSRequestExtensions(SequenceOf):
    _child_spec = TBSRequestExtension


class TBSRequest(Sequence):
    _fields = [
        ('version', Version, {'explicit': 0, 'default': 'v1'}),
        ('requestor_name', GeneralName, {'explicit': 1, 'optional': True}),
        ('request_list', Requests),
        ('request_extensions', TBSRequestExtensions, {'explicit': 2, 'optional': True}),
    ]


class Certificates(SequenceOf):
    _child_spec = Certificate


class Signature(Sequence):
    _fields = [
        ('signature_algorithm', SignedDigestAlgorithm),
        ('signature', OctetBitString),
        ('certs', Certificates, {'explicit': 0, 'optional': True}),
    ]


class OCSPRequest(Sequence):
    _fields = [
        ('tbs_request', TBSRequest),
        ('optional_signature', Signature, {'explicit': 0, 'optional': True}),
    ]

    _processed_extensions = False
    _critical_extensions = None
    _nonce_value = None
    _acceptable_responses_value = None
    _preferred_signature_algorithms_value = None

    def _set_extensions(self):
        """
        Sets common named extensions to private attributes and creates a list
        of critical extensions
        """

        self._critical_extensions = set()

        for extension in self['tbs_request']['request_extensions']:
            name = extension['extn_id'].native
            attribute_name = '_%s_value' % name
            if hasattr(self, attribute_name):
                setattr(self, attribute_name, extension['extn_value'].parsed)
            if extension['critical'].native:
                self._critical_extensions.add(name)

        self._processed_extensions = True

    @property
    def critical_extensions(self):
        """
        Returns a set of the names (or OID if not a known extension) of the
        extensions marked as critical

        :return:
            A set of unicode strings
        """

        if not self._processed_extensions:
            self._set_extensions()
        return self._critical_extensions

    @property
    def nonce_value(self):
        """
        This extension is used to prevent replay attacks by including a unique,
        random value with each request/response pair

        :return:
            None or an OctetString object
        """

        if self._processed_extensions is False:
            self._set_extensions()
        return self._nonce_value

    @property
    def acceptable_responses_value(self):
        """
        This extension is used to allow the client and server to communicate
        with alternative response formats other than just basic_ocsp_response,
        although no other formats are defined in the standard.

        :return:
            None or an AcceptableResponses object
        """

        if self._processed_extensions is False:
            self._set_extensions()
        return self._acceptable_responses_value

    @property
    def preferred_signature_algorithms_value(self):
        """
        This extension is used by the client to define what signature algorithms
        are preferred, including both the hash algorithm and the public key
        algorithm, with a level of detail down to even the public key algorithm
        parameters, such as curve name.

        :return:
            None or a PreferredSignatureAlgorithms object
        """

        if self._processed_extensions is False:
            self._set_extensions()
        return self._preferred_signature_algorithms_value


class OCSPResponseStatus(Enumerated):
    _map = {
        0: 'successful',
        1: 'malformed_request',
        2: 'internal_error',
        3: 'try_later',
        5: 'sign_required',
        6: 'unauthorized',
    }


class ResponderId(Choice):
    _alternatives = [
        ('by_name', Name, {'explicit': 1}),
        ('by_key', OctetString, {'explicit': 2}),
    ]


# Custom class to return a meaningful .native attribute from CertStatus()
class StatusGood(Null):
    def set(self, value):
        """
        Sets the value of the object

        :param value:
            None or 'good'
        """

        if value is not None and value != 'good' and not isinstance(value, Null):
            raise ValueError(unwrap(
                '''
                value must be one of None, "good", not %s
                ''',
                repr(value)
            ))

        self.contents = b''

    @property
    def native(self):
        return 'good'


# Custom class to return a meaningful .native attribute from CertStatus()
class StatusUnknown(Null):
    def set(self, value):
        """
        Sets the value of the object

        :param value:
            None or 'unknown'
        """

        if value is not None and value != 'unknown' and not isinstance(value, Null):
            raise ValueError(unwrap(
                '''
                value must be one of None, "unknown", not %s
                ''',
                repr(value)
            ))

        self.contents = b''

    @property
    def native(self):
        return 'unknown'


class RevokedInfo(Sequence):
    _fields = [
        ('revocation_time', GeneralizedTime),
        ('revocation_reason', CRLReason, {'explicit': 0, 'optional': True}),
    ]


class CertStatus(Choice):
    _alternatives = [
        ('good', StatusGood, {'implicit': 0}),
        ('revoked', RevokedInfo, {'implicit': 1}),
        ('unknown', StatusUnknown, {'implicit': 2}),
    ]


class CrlId(Sequence):
    _fields = [
        ('crl_url', IA5String, {'explicit': 0, 'optional': True}),
        ('crl_num', Integer, {'explicit': 1, 'optional': True}),
        ('crl_time', GeneralizedTime, {'explicit': 2, 'optional': True}),
    ]


class SingleResponseExtensionId(ObjectIdentifier):
    _map = {
        '1.3.6.1.5.5.7.48.1.3': 'crl',
        '1.3.6.1.5.5.7.48.1.6': 'archive_cutoff',
        # These are CRLEntryExtension values from
        # https://tools.ietf.org/html/rfc5280
        '2.5.29.21': 'crl_reason',
        '2.5.29.24': 'invalidity_date',
        '2.5.29.29': 'certificate_issuer',
        # https://tools.ietf.org/html/rfc6962.html#page-13
        '1.3.6.1.4.1.11129.2.4.5': 'signed_certificate_timestamp_list',
    }


class SingleResponseExtension(Sequence):
    _fields = [
        ('extn_id', SingleResponseExtensionId),
        ('critical', Boolean, {'default': False}),
        ('extn_value', ParsableOctetString),
    ]

    _oid_pair = ('extn_id', 'extn_value')
    _oid_specs = {
        'crl': CrlId,
        'archive_cutoff': GeneralizedTime,
        'crl_reason': CRLReason,
        'invalidity_date': GeneralizedTime,
        'certificate_issuer': GeneralNames,
        'signed_certificate_timestamp_list': OctetString,
    }


class SingleResponseExtensions(SequenceOf):
    _child_spec = SingleResponseExtension


class SingleResponse(Sequence):
    _fields = [
        ('cert_id', CertId),
        ('cert_status', CertStatus),
        ('this_update', GeneralizedTime),
        ('next_update', GeneralizedTime, {'explicit': 0, 'optional': True}),
        ('single_extensions', SingleResponseExtensions, {'explicit': 1, 'optional': True}),
    ]

    _processed_extensions = False
    _critical_extensions = None
    _crl_value = None
    _archive_cutoff_value = None
    _crl_reason_value = None
    _invalidity_date_value = None
    _certificate_issuer_value = None

    def _set_extensions(self):
        """
        Sets common named extensions to private attributes and creates a list
        of critical extensions
        """

        self._critical_extensions = set()

        for extension in self['single_extensions']:
            name = extension['extn_id'].native
            attribute_name = '_%s_value' % name
            if hasattr(self, attribute_name):
                setattr(self, attribute_name, extension['extn_value'].parsed)
            if extension['critical'].native:
                self._critical_extensions.add(name)

        self._processed_extensions = True

    @property
    def critical_extensions(self):
        """
        Returns a set of the names (or OID if not a known extension) of the
        extensions marked as critical

        :return:
            A set of unicode strings
        """

        if not self._processed_extensions:
            self._set_extensions()
        return self._critical_extensions

    @property
    def crl_value(self):
        """
        This extension is used to locate the CRL that a certificate's revocation
        is contained within.

        :return:
            None or a CrlId object
        """

        if self._processed_extensions is False:
            self._set_extensions()
        return self._crl_value

    @property
    def archive_cutoff_value(self):
        """
        This extension is used to indicate the date at which an archived
        (historical) certificate status entry will no longer be available.

        :return:
            None or a GeneralizedTime object
        """

        if self._processed_extensions is False:
            self._set_extensions()
        return self._archive_cutoff_value

    @property
    def crl_reason_value(self):
        """
        This extension indicates the reason that a certificate was revoked.

        :return:
            None or a CRLReason object
        """

        if self._processed_extensions is False:
            self._set_extensions()
        return self._crl_reason_value

    @property
    def invalidity_date_value(self):
        """
        This extension indicates the suspected date/time the private key was
        compromised or the certificate became invalid. This would usually be
        before the revocation date, which is when the CA processed the
        revocation.

        :return:
            None or a GeneralizedTime object
        """

        if self._processed_extensions is False:
            self._set_extensions()
        return self._invalidity_date_value

    @property
    def certificate_issuer_value(self):
        """
        This extension indicates the issuer of the certificate in question.

        :return:
            None or an x509.GeneralNames object
        """

        if self._processed_extensions is False:
            self._set_extensions()
        return self._certificate_issuer_value


class Responses(SequenceOf):
    _child_spec = SingleResponse


class ResponseDataExtensionId(ObjectIdentifier):
    _map = {
        '1.3.6.1.5.5.7.48.1.2': 'nonce',
        '1.3.6.1.5.5.7.48.1.9': 'extended_revoke',
    }


class ResponseDataExtension(Sequence):
    _fields = [
        ('extn_id', ResponseDataExtensionId),
        ('critical', Boolean, {'default': False}),
        ('extn_value', ParsableOctetString),
    ]

    _oid_pair = ('extn_id', 'extn_value')
    _oid_specs = {
        'nonce': OctetString,
        'extended_revoke': Null,
    }


class ResponseDataExtensions(SequenceOf):
    _child_spec = ResponseDataExtension


class ResponseData(Sequence):
    _fields = [
        ('version', Version, {'explicit': 0, 'default': 'v1'}),
        ('responder_id', ResponderId),
        ('produced_at', GeneralizedTime),
        ('responses', Responses),
        ('response_extensions', ResponseDataExtensions, {'explicit': 1, 'optional': True}),
    ]


class BasicOCSPResponse(Sequence):
    _fields = [
        ('tbs_response_data', ResponseData),
        ('signature_algorithm', SignedDigestAlgorithm),
        ('signature', OctetBitString),
        ('certs', Certificates, {'explicit': 0, 'optional': True}),
    ]


class ResponseBytes(Sequence):
    _fields = [
        ('response_type', ResponseType),
        ('response', ParsableOctetString),
    ]

    _oid_pair = ('response_type', 'response')
    _oid_specs = {
        'basic_ocsp_response': BasicOCSPResponse,
    }


class OCSPResponse(Sequence):
    _fields = [
        ('response_status', OCSPResponseStatus),
        ('response_bytes', ResponseBytes, {'explicit': 0, 'optional': True}),
    ]

    _processed_extensions = False
    _critical_extensions = None
    _nonce_value = None
    _extended_revoke_value = None

    def _set_extensions(self):
        """
        Sets common named extensions to private attributes and creates a list
        of critical extensions
        """

        self._critical_extensions = set()

        for extension in self['response_bytes']['response'].parsed['tbs_response_data']['response_extensions']:
            name = extension['extn_id'].native
            attribute_name = '_%s_value' % name
            if hasattr(self, attribute_name):
                setattr(self, attribute_name, extension['extn_value'].parsed)
            if extension['critical'].native:
                self._critical_extensions.add(name)

        self._processed_extensions = True

    @property
    def critical_extensions(self):
        """
        Returns a set of the names (or OID if not a known extension) of the
        extensions marked as critical

        :return:
            A set of unicode strings
        """

        if not self._processed_extensions:
            self._set_extensions()
        return self._critical_extensions

    @property
    def nonce_value(self):
        """
        This extension is used to prevent replay attacks on the request/response
        exchange

        :return:
            None or an OctetString object
        """

        if self._processed_extensions is False:
            self._set_extensions()
        return self._nonce_value

    @property
    def extended_revoke_value(self):
        """
        This extension is used to signal that the responder will return a
        "revoked" status for non-issued certificates.

        :return:
            None or a Null object (if present)
        """

        if self._processed_extensions is False:
            self._set_extensions()
        return self._extended_revoke_value

    @property
    def basic_ocsp_response(self):
        """
        A shortcut into the BasicOCSPResponse sequence

        :return:
            None or an asn1crypto.ocsp.BasicOCSPResponse object
        """

        return self['response_bytes']['response'].parsed

    @property
    def response_data(self):
        """
        A shortcut into the parsed, ResponseData sequence

        :return:
            None or an asn1crypto.ocsp.ResponseData object
        """

        return self['response_bytes']['response'].parsed['tbs_response_data']