openssl - ASN1 parsing with swift -


i think basic idea behind asn.1 parsing. walk bytes, interpret them , useful them. alas stuck on implementation.

apple has no sample code (that find), security reasons. openssl not documented, can guess @ functions do. sample code in swift did find doesn't handle case 17 (the in-app purchases), 1 thing interested in.

i tried figuring out in data stream pointer located, same nonsensical result of 49.

    let receiptcontents = nsdata(contentsofurl: receiptlocation)!      let receiptbio = bio_new(bio_s_mem())     bio_write(receiptbio, receiptcontents.bytes, int32(receiptcontents.length))     contents = d2i_pkcs7_bio(receiptbio, nil)      //parsing     var currentindex    = unsafepointer<uint8>()     var endindex        = unsafepointer<uint8>()      let octets      = pkcs7_d_data(pkcs7_d_sign(self.contents).memory.contents)      var ptr = unsafepointer<uint8>(octets.memory.data)     let end = ptr.advancedby(int(octets.memory.length))     println(ptr.memory) //always 49 ???     println(end.memory) //always 0 ???     println(octets.memory.length)

i tried parsing nsdata myself, well, type of binaire data?

    receiptcontents = nsdata(contentsofurl: receiptlocation)!      //get bytes     let count = receiptcontents.length / sizeof(uint8)     var bytes = [uint8](count: count, repeatedvalue: 0)     receiptcontents.getbytes(&bytes, length:count * sizeof(uint8))      //parsing     index in 0...5     {         let value = int(bytes[index])         println(value)     }

i output: 48 130 21 57 6 9

but if understand asn.1 format correctly, it's supposed start value of 17 (set), 3 bytes length (int24?), value of 16 (first sequence), sequence length (1 byte), sequence type (1 byte), sequence payload, (repeat).

other types int32, int16 makes less sense me.

not sure how proceed here. suggestions?

from outset, suppose should disclaim saying i'm not familiar many of underlying technologies (swift, openssl, biometrics standards think you're working with).

that said, you're running afoul of ber's tagging rules. the wiki article on x.690 has introductory comments how ber tags constructed, you'll want consult annex of x.690 example encoding , x.680 §8 information tagging.

a set type can appear in several different forms; in case 49 = 0x31 = 0b00110001 = universal 17 (set, constructed). other forms may occur, 1 that's explicitly identified set tag itself: specification may use different tag set type.


Comments

Post a Comment

Popular posts from this blog

javascript - Using jquery append to add option values into a select element not working -

i'm looking dynamically populate select element names of items stored array. for reason it's not working , i'm not sure why. html: <div class="col-md-4 col-md-offset-4"> <select class="select1"> </select> , <select class="select2"> </select> </div> note i'm using bootstrap layout. here's jquery i'm using try , populate ".select1" jquery: select: function() { $.each(state.greens, function(index, value) { $(".select1").append("<option value =' " + index + " '>" + state.greens[index].name + "</option>"); }); } note function 'select' stored within object called 'display'. state.greens name of array i'm trying access. so @ end of html page call display.select(); call function. no error messages showing in console. also, saw question: appending
Read more

Android soft keyboard reverts to default keyboard on orientation change -

i'm building android soft keyboard , can't seem fix bug - have arabic , qwerty keyboard , when rotate device on qwerty keyboard (or arabic shift), it's if program has "restarted" , becomes arabic keyboard without shift. the onsaveinstancestate(bundle savedinstancestate) not work because application not extend activity inputmethodservice . i put following in android manifest android:configchanges="keyboard|keyboardhidden|orientation" android:windowsoftinputmode="stateunchanged|adjustresize"> i tried using @override public void onconfigurationchanged(configuration newconfig) { super.onconfigurationchanged(newconfig); log.i(mydebug, "config changed " + currentkeyboard.equals(qwerty)); } however, currentkeyboard.equals(qwerty)) results false , made sure true before orientation change. any appreciated. i think applications fault. if application restarting on orientation change
Read more

Rendering JButton to get the JCheckBox behavior in a JTable by using images does not update my table -

i rendering jbutton image on simulate jcheckbox behavior. why don't let jtable render jcheckbox? because need bigger checkboxes , there's no way can resize them (as far know). so, have own table cell renderer , editor. both renders jbutton , checkbox images on them. trying change image checked image unchecked image (or vice versa) , update cell value (boolean true or false). however, reason, getcelleditorvalue() not update table. so, release mouse, value goes original one. any appreciated! lot! public class tableexample extends jframe { jscrollpane pane; jpanel panel; jtable table; object[][] data; mytablemodel tm; renderer buttoncolumn; public tableexample(object[][] data) throws ioexception { string[] columns = {"column#1", "column#2", "column#3", "column#4", "column#5", "column#6"}; this.data = data; this.setpreferredsize(new dimension(700, 500));
Read more