I have really enjoyed reading this tutorial and I plan to add StoreKit Tests to my project. (finally I can test this without real device 
)
first of all, I would like to ask a question about OpenSSL library that was used in the tutorial. Are there any frameworks made by apple that allows safe SSL connection? Secondly, could you provide more informations about cryptographic techniques that were used in this project? (Looks like ASN1Helpers.swift file is used for reading decoded data)