(Swift 2) 3DES Encryption, ECB, CBC modes

3DES encryption. The Chilkat encryption component supports Triple-DES in both ECB (Electronic Cookbook) and CBC (Cipher-Block Chaining) cipher modes.

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

    let crypt = CkoCrypt2()

    // Specify 3DES for the encryption algorithm:
    crypt.CryptAlgorithm = "3des"

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

    // KeyLength must be 192.  3DES is technically 168-bits;
    // the most-significant bit of each key byte is a parity bit,
    // so we must indicate a KeyLength of 192, which includes
    // the parity bits.
    crypt.KeyLength = 192

    // 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.  3DES 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 
    // 3DES, the key must be 24 bytes (i.e. 192-bits).
    var keyHex: String? = "000102030405060708090A0B0C0D0E0F0001020304050607"
    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!)")

}