Andrew Bancroft • 6/10/2016

Extracting a PKCS7 Container for Receipt Validation with Swift

This article continues a series on receipt validation in Swift, focusing on extracting the PKCS7 container from a receipt using the OpenSSL cryptography library. It covers setting up a ReceiptExtractor struct, handling errors with Swift's error throwing, and expanding the ReceiptValidationError enum. The guide provides code snippets and explains how to wrap OpenSSL's C API in Swift-friendly functions for clarity and maintainability. It is a technical tutorial aimed at iOS developers implementing in-app purchase receipt validation.

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#Openssl #Io #Swift