(Swift 3/4) Blowfish CFB Mode Encryption

Demonstrates how to encrypt using Blowfish CFB (Cipher Feedback) mode.

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

func chilkatTest() {
    let crypt = CkoCrypt2()!

    var success: Bool = crypt.unlockComponent("Anything for 30-day trial")
    if success != true {
        print("\(crypt.lastErrorText!)")
        return
    }

    //  Use "blowfish2" to produce correct results that match published blowfish test vectors.
    crypt.cryptAlgorithm = "blowfish2"
    crypt.cipherMode = "cfb"
    crypt.keyLength = 256

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

    //  The block size of the blowfish algoirthm is 8 bytes, therefore the IV is 8 bytes.
    var ivHex: String? = "0001020304050607"
    crypt.setEncodedIV(ivHex, encoding: "hex")

    //  The secret key must equal the size of the key.  For
    //  256-bit encryption, the binary secret key is 32 bytes.
    var keyHex: String? = "603deb1015ca71be2b73aef0857d77811f352c073b6108d72d9810a30914dff4"
    crypt.setEncodedKey(keyHex, encoding: "hex")

    //  Encrypt a string...
    var encStr: String? = crypt.encryptStringENC("In all intellectual debates, both sides tend to be correct in what they affirm, and wrong in what they deny. -- John Stuart Mill")
    print("\(encStr!!)")

    let decrypt = CkoCrypt2()!

    decrypt.cryptAlgorithm = "blowfish2"
    decrypt.cipherMode = "cfb"
    decrypt.keyLength = 256
    decrypt.encodingMode = "hex"
    decrypt.setEncodedIV(ivHex, encoding: "hex")
    decrypt.setEncodedKey(keyHex, encoding: "hex")

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

}