Simple XOR Encryption and Decryption in Swift (Playground Code)

Here's a simple example of conversion of strings to UTF-8 byte arrays. Followed by a XOR encryption and decryption in Swift.

let text = [UInt8]("hello!!!".utf8)
let cipher = [UInt8]("goodbye!".utf8)

var encrypted = [UInt8]()

// encrypt bytes
for t in enumerate(text) {
    encrypted.append(t.element ^ cipher[t.index])
}

var decrypted = [UInt8]()

// decrypt bytes
for t in enumerate(encrypted) {
    decrypted.append(t.element ^ cipher[t.index])
}

String(bytes: decrypted, encoding: NSUTF8StringEncoding) // hello!!!

To read more about XOR encryption and for an interactive example see full blogpost.

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