Merge pull request #16 from denissimon/master

Swift implementation

README.md

@@ -10,12 +10,13 @@ Simple implementation of XOR Encryption/Decrypting in various languages, includi
 - [F#](F%23/Program.fs) by [pawelizycki](https://github.com/pawelizycki)
 - [Go](Go/xor.go)
 - [Groovy](Groovy/XOREncryption.groovy)
-- [Java \(Android Compatible\)](Java \(Android compatible\)/XOREncryption.java)
+- [Java \(Android Compatible\)](Java%20\(Android%20compatible\)/XOREncryption.java)
 - [JavaScript \(Node.js Compatible\)](JavaScript/XOREncryption.js)
 - [Kotlin](Kotlin/XOREncryption.kt)
 - [Objective-C](Objective-C/main.m)
 - [Python](Python/XOREncryption.py)
 - [Ruby](Ruby/xor.rb)
+- [Swift](Swift/XOREncryption.swift)
 - [Visual Basic.NET](VB.NET/XORCrypto.vb)
 
 This implementation goes beyond the basic single-key model to use multiple keys in a particular sequence, making it that much more difficult to brute-force.

Swift/XOREncryption.swift

@@ -0,0 +1,33 @@
+//
+//  XOREncryption.swift
+//  XOREncryption
+//
+//  Created by Denis Simon on 2019-01-08.
+//
+
+import Foundation
+
+extension Character {
+    func utf8() -> UInt8 {
+        let utf8 = String(self).utf8
+        return utf8[utf8.startIndex]
+    }
+}
+
+func encryptDecrypt(_ input: String) -> String {
+    let key = "KCQ".characters.map { $0 } //Can be any chars, and any length array
+    let length = key.count
+    var output = ""
+    
+    for i in input.characters.enumerated() {
+        let byte = [i.element.utf8() ^ key[i.offset % length].utf8()]
+        output.append(String(bytes: byte, encoding: .utf8)!)
+    }
+    
+    return output
+}
+
+let encrypted = encryptDecrypt("Hello, World!")
+print("Encrypted: \(encrypted)") // output: Encrypted: &=',}k>9/5j
+let decrypted = encryptDecrypt(encrypted)
+print("Decrypted: \(decrypted)") // output: Decrypted: Hello, World!