objective c - Decrypt p7s file on iOS -


working on test ios app have faced following problem.

from remote webserver recieve .p7s file following contents (which viewable in mac's textedit app):

0Ä  *Ühܘ †Ä0Ä10  +�0Ä    *Ühܘ †Ä$ÄÇ˚<?xml version="1.0" encoding="utf-8"?> <!doctype plist public "-//apple//dtd plist 1.0//en" "http://www.apple.com/dtds/propertylist-1.0.dtd"> <plist version="1.0"> <dict>     <key>challenge</key>     <string>panacya</string>     <key>imei</key>     <string>01 232700 828513 5</string>     <key>product</key>     <string>ipad1,1</string>     <key>serial</key>     <string>gb0269njetu</string>     <key>udid</key>     <string>2866681d94ae6c56d189485d39c54eaedecf211c</string>     <key>version</key>     <string>9a5288d</string> </dict> </plist> ������†Ç [0ÇÛ0Ç\† u6ÜΩ~60     *Ühܘ �0z10   uus10u  apple inc.10uapple iphone10uapple iphone device ca0 110808222517z 140808222517z0ÅÉ1-0+u$2890c19c-43f9-47c5-8534-a54f184e37dc10    uus10   uca10u  cupertino10u

here's link original file - https://www.dropbox.com/s/lm05gg866zdrz20/ota-response.p7s?dl=0

i save nsdata .p7s file disk.

i need embedded .plist out of file (judging see contains that) or @ least convert readable nsstring can display in uilabel.

is @ possible , how achieve it?

you can read nsdata instnace , use

- (nsrange)rangeofdata:(nsdata *)datatofind options:(nsdatasearchoptions)mask range:(nsrange)searchrange

to find beginning , end of plist. use

- (nsdata *)subdatawithrange:(nsrange)range

to optain plist data. convert nsstring with:

- (instancetype)initwithdata:(nsdata *)data encoding:(nsstringencoding)encoding

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