Databases
StackOverflow2013
Postsdbo
POIA5STRING ASN.1 coding format: in-app purchase receipt validation and decoding
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POIA5STRING ASN.1 coding format: in-app purchase receipt validation and decoding
    primarykey
    data
    text
    <p>I'm trying to figure out if IA5STRING format (ASN.1) is actually equivalent to ASCII. That is, should I be able to do:</p> <pre><code>NSString *ia5StringWithDate = [[NSString alloc] initWithBytes:is5StringData length:is5StringLength encoding:NSASCIIStringEncoding]; </code></pre> <p>Here is the context:</p> <p>I'm working from <a href="https://developer.apple.com/library/ios/releasenotes/General/ValidateAppStoreReceipt/Introduction.html#//apple_ref/doc/uid/TP40010573-CH105-SW1" rel="nofollow noreferrer">this apple doc</a> and from WWDC 2013 session "Using Receipts to Protect Your Digital Sales". </p> <p>I've got most of my code worked out (untested yet!), but in attempting to actually pull out the in-app purchase portion of the receipt, the in-app purchase receipt field Purchase Date is described as being an RFC 3339 date. Given that I have an RFC 3339 date as an NSString, I think I've got a method to convert the NSString date to an NSDate (see <a href="https://stackoverflow.com/questions/14447693/how-to-format-convert-the-string-2013-01-27t0231470800-into-nsdate">How to format convert the string 2013-01-27T02:31:47+08:00 into NSDate</a>). But, the format of the Purchase Date is given as IA5STRING (see <a href="https://developer.apple.com/library/ios/releasenotes/General/ValidateAppStoreReceipt/Chapters/ReceiptFields.html#//apple_ref/doc/uid/TP40010573-CH106-SW12" rel="nofollow noreferrer">this reference</a>).</p> <p>From <a href="http://en.wikipedia.org/wiki/IA5STRING" rel="nofollow noreferrer">the Wiki page for IA5STRING</a>, it says "Those characters are generally equivalent to the first 128 characters of the ASCII alphabet". I don't like the sound of "generally". </p> <p><a href="http://luca.ntop.org/Teaching/Appunti/asn1.html" rel="nofollow noreferrer">This reference</a> suggests that IA5STRING's are the same as ASCII.</p> <p>Thoughts?</p> <p>Thanks, Chris. </p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USCommunity
    1. USChris Prince
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COYou may wish to see my class for doing receipt validation under iOS: https://github.com/rmaddy/VerifyStoreReceiptiOS
      singulars
      1. POIA5STRING ASN.1 coding format: in-app purchase receipt validation and decoding
      1. USrmaddy
    2. COThanks. This helps. I see you have used NSASCIIStringEncoding coding to convert the IA5STRING date to an NSString. Good to see that it works. Is there a reason you didn't use asn1c to generate your ASN.1 parser?
      singulars
      1. POIA5STRING ASN.1 coding format: in-app purchase receipt validation and decoding
      1. USChris Prince
    3. COI didn't write the ASN parser code. I got that from the other project I referenced.
      singulars
      1. POIA5STRING ASN.1 coding format: in-app purchase receipt validation and decoding
      1. USrmaddy
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload