(Swift 3,4,5...) RC2 Encryption and Decryption

RC2 encryption. The Chilkat encryption component supports RC2 encryption in both ECB (Electronic Cookbook) and CBC (Cipher-Block Chaining) modes. The key size may range from 8 bits to 1024 bits.

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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()!

    // Set the encryption algorithm = "rc2"	
    crypt.cryptAlgorithm = "rc2"

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

    // KeyLength may range from 8 bits to 1024 bits
    crypt.keyLength = 128

    // RC2 also has an effective key length property
    // which can also range from 8 bits to 1024 bits:
    crypt.rc2EffectiveKeyLength = 128

    // 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.  RC2 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 mode.
    // 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 128-bit encryption, the binary secret key is 16 bytes.
    var keyHex: String? = "000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F"
    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!)")

}