(Swift 3,4,5...) AES Encrypt String (utf-8 byte representation) and return Base64

Demonstrates how to AES encrypt the utf-8 byte representation of a string and return in base64 format.

Chilkat Downloads for the Swift Programming Language MAC OS X (Cocoa) Objective-C/Swift Libs iOS Objective-C/Swift Libs

func chilkatTest() {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    let crypt = CkoCrypt2()!

    crypt.cryptAlgorithm = "aes"
    crypt.cipherMode = "cbc"
    crypt.keyLength = 256
    crypt.charset = "utf-8"
    crypt.encodingMode = "base64"

    var ivHex: String? = "000102030405060708090A0B0C0D0E0F"
    crypt.setEncodedIV(ivHex, encoding: "hex")
    var keyHex: String? = "000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F"
    crypt.setEncodedKey(keyHex, encoding: "hex")

    var encryptedStr: String? = crypt.encryptStringENC("This is the original string")
    print("\(encryptedStr!)")

    // Let's say we want to URL encode the base64 string..
    crypt.cryptAlgorithm = "none"
    crypt.encodingMode = "url"
    var urlEncoded: String? = crypt.encryptStringENC(encryptedStr)
    print("\(urlEncoded!)")

    // Sample output:

    //  q3fmgEqjqa9o//ZS6aPuh4Wtbrrxx/WOIQSKeVnesZg=
    //  q3fmgEqjqa9o%2F%2FZS6aPuh4Wtbrrxx%2FWOIQSKeVnesZg%3D

    // -------------------------------------------------------------------
    // Now let's do the reverse...
    // 

    // We start with a string that is the binary encrypted data, base64 encoded, and then URL encoded.
    var encBase64Url: String? = "q3fmgEqjqa9o%2F%2FZS6aPuh4Wtbrrxx%2FWOIQSKeVnesZg%3D"

    // We'll use the same crypt object.  If using a new instance of the crypt object,
    // make sure *all* settings are identical:  the algorithm, cipher mode, key length, charset, encoding mode, IV, and secret key.

    // Decode from URL...
    crypt.cryptAlgorithm = "none"
    crypt.encodingMode = "url"
    var encBase64: String? = crypt.decryptStringENC(urlEncoded)
    print("\(encBase64!)")

    // Now decrypt...
    crypt.cryptAlgorithm = "aes"
    crypt.encodingMode = "base64"
    var originalStr: String? = crypt.decryptStringENC(encBase64)
    print("\(originalStr!)")

}