(Swift 3,4,5...) Encrypt / Decrypt Secure Strings

Demonstrates how to use the EncryptSecureENC and DecryptSecureENC methods to encrypt/decrypt secure strings. These methods were added in Chilkat v9.5.0.71 (released January 2018).

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

    // Load the secure string with some text.
    let secStr1 = CkoSecureString()!
    var success: Bool = secStr1.loadFile("qa_data/txt/helloWorld.txt", charset: "utf-8")
    if success != true {
        print("Failed to load helloWorld.txt")
        return
    }

    let crypt = CkoCrypt2()!

    crypt.cryptAlgorithm = "aes"
    crypt.cipherMode = "cbc"
    crypt.keyLength = 128
    crypt.setEncodedKey("000102030405060708090A0B0C0D0E0F", encoding: "hex")
    crypt.setEncodedIV("000102030405060708090A0B0C0D0E0F", encoding: "hex")
    crypt.encodingMode = "base64"

    // Return the base64 encoded encrypted contents of secStr1.
    var encryptedStr: String? = crypt.encryptSecureENC(secStr1)
    print("Encrypted string: \(encryptedStr!)")

    // Output:
    // Encrypted string: qiq+IFhcjTkEIkZyf31V/g==

    // Decrypt to secStr2:
    let secStr2 = CkoSecureString()!
    crypt.decryptSecureENC(encryptedStr, secureStr: secStr2)

    // Access the contents of secStr2
    print("Decrypted string: \(secStr2.access()!)")

    // Output:
    // Decrypted string: Hello World!

}