Itunes iap receipt validation locally in python.

Question

I am new to OpenSSL and I am trying to validate Itunes IAP receipts locally in python.

The Receipt Validation Programming Guide (https://developer.apple.com/library/ios/releasenotes/General/ValidateAppStoreReceipt/Chapters/ValidateLocally.html) says:

The outermost portion (labeled Receipt in the figure) is a PKCS #7 container, as defined by RFC 2315, with its payload encoded using ASN.1 (Abstract Syntax Notation One), as defined by ITU-T X.690. The payload is composed of a set of receipt attributes. Each receipt attribute contains a type, a version, and a value.

import OpenSSL

f = open('sample_IAP_receipt_base64.txt', 'r').read()

type = OpenSSL.crypto.FILETYPE_ASN1
data = OpenSSL.crypto.load_pkcs7_data(type, f)
print f

This test seems to generate an error:

    data = OpenSSL.crypto.load_pkcs7_data(type, f)
OpenSSL.crypto.Error: [('asn1 encoding routines', 'ASN1_CHECK_TLEN', 'wrong tag'), ('asn1 encoding routines', 'ASN1_ITEM_EX_D2I', 'nested asn1 error')]

Any ideas how to get this working?

you need to decode it from base64 first – Andrew Kurinnyi Jul 13 '16 at 18:46 — Andrew Kurinnyi, Jul 13 '16 at 18:46

score 1 · Answer 1 · answered Mar 20 '15 at 19:49

1

My recommendation is to use an existing python package, itunes-iap is a good one:

https://pypi.python.org/pypi/itunes-iap

answered Mar 20 '15 at 19:49

maki

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score 0 · Answer 2 · answered Sep 10 '18 at 23:37

0

The only thing that will do that locally is this library:

https://github.com/SilentCircle/iap-local-receipt

answered Sep 10 '18 at 23:37

Stavros Korokithakis

4,680
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Itunes iap receipt validation locally in python.

2 Answers2