(Swift 3,4,5...) 56-bit DES Encryption, ECB, CBC modes

Demonstrates the older 56-bit DES encryption in ECB and CBC modes.

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

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

    let crypt = CkoCrypt2()!

    // Specify DES for the encryption algorithm:
    crypt.cryptAlgorithm = "des"

    // CipherMode may be "ecb" or "cbc"
    crypt.cipherMode = "cbc"

    // Keylength is 64 bits (56 bits + 8 parity bits)
    crypt.keyLength = 64

    // The padding scheme determines the contents of the bytes
    // that are added to pad the result to a multiple of the
    // encryption algorithm's block size.  DES has a block
    // size of 8 bytes, so encrypted output is always
    // a multiple of 8.
    crypt.paddingScheme = 0

    // EncodingMode specifies the encoding of the output for
    // encryption, and the input for decryption.
    // It may be "hex", "url", "base64", or "quoted-printable".
    crypt.encodingMode = "hex"

    // An initialization vector is required if using CBC or CFB modes.
    // ECB mode does not use an IV.
    // The length of the IV is equal to the algorithm's block size.
    // It is NOT equal to the length of the key.
    var ivHex: String? = "0001020304050607"
    crypt.setEncodedIV(ivHex, encoding: "hex")

    // The secret key must equal the size of the key.  For 
    // DES, the key must be 8 bytes (i.e. 64-bits).
    var keyHex: String? = "0001020304050607"
    crypt.setEncodedKey(keyHex, encoding: "hex")

    // Encrypt a string...
    // The input string is 44 ANSI characters (i.e. 44 bytes), so
    // the output should be 48 bytes (a multiple of 8).
    // Because the output is a hex string, it should
    // be 96 characters long (2 chars per byte).
    var encStr: String? = crypt.encryptStringENC("The quick brown fox jumps over the lazy dog.")
    print("\(encStr!)")

    // Now decrypt:
    var decStr: String? = crypt.decryptStringENC(encStr)
    print("\(decStr!)")

}