(Swift 3,4,5...) PBKDF2 - Derive Key from Password

Demonstrates how to derive a symmetric encryption key from a password using PBKDF2. This example matches the results found at this URL: http://www.di-mgt.com.au/cryptoKDFs.html#examplespbkdf

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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()!

    var hexKey: String?
    // http://www.di-mgt.com.au/cryptoKDFs.html#examplespbkdf

    var pw: String? = "password"
    var pwCharset: String? = "ansi"
    // Hash algorithms may be: sha1, md2, md5, etc.
    var hashAlg: String? = "sha1"
    // The salt should be 8 bytes:
    var saltHex: String? = "78578E5A5D63CB06"
    var iterationCount: Int = 2048
    // Derive a 192-bit key from the password.
    var outputBitLen: Int = 192

    // The derived key is returned as a hex or base64 encoded string.
    // (Note: The salt argument must be a string that also uses
    // the same encoding.)
    var enc: String? = "hex"

    hexKey = crypt.pbkdf2(pw, charset: pwCharset, hashAlg: hashAlg, salt: saltHex, iterationCount: iterationCount, outputKeyBitLen: outputBitLen, encoding: enc)

    print("\(hexKey!)")

    // The output should have this value:
    // BFDE6BE94DF7E11DD409BCE20A0255EC327CB936FFE9364

}