Push Notifications by 2018

Author:2018
Language: eng
Format: epub
Publisher: Ray Wenderlich

Implementing the ROT13 cipher

In your Payload Modification target create a new Swift file named ROT13.swift and paste this code into it:

import Foundation struct ROT13 { static let shared = ROT13() private let upper = Array("ABCDEFGHIJKLMNOPQRSTUVWXYZ") private let lower = Array("abcdefghijklmnopqrstuvwxyz") private var mapped: [Character: Character] = [:] private init() { for i in 0 ..< 26 { let idx = (i + 13) % 26 mapped[upper[i]] = upper[idx] mapped[lower[i]] = lower[idx] } } public func decrypt(_ str: String) -> String { return String(str.map { mapped[$0] ?? $0 }) } }

You can find many different ways of implementing this cipher in Swift. The above is just a quick and dirty way to handle the American English alphabet.

Obviously, the above code makes a nice sample for a book as it doesn’t require downloads and configuration. However, for real security, you should look to something like the CryptoSwift (https://cryptoswift.io/) library.

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