(Swift) PBKDF2 Key Derivation

Demonstrates AES secret key derivation from a password using PBDKF2.

For more information, see https://www.chilkatsoft.com/key_derivation_pbkdf2.asp

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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 password: String? = "correcthorsebatterystaple"

    // Derive from the utf-8 byte representation of the password.
    var charset: String? = "utf-8"

    var hashAlg: String? = "sha256"

    crypt.encodingMode = "hex"
    var saltHex: String? = crypt.genRandomBytesENC(16)

    var iterationCount: Int = 310000

    // Derive a 256-bit key from the password.
    var outputBitLen: Int = 256

    // 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"

    var hexKey: String? = crypt.pbkdf2(password, charset: charset, hashAlg: hashAlg, salt: saltHex, iterationCount: iterationCount, outputKeyBitLen: outputBitLen, encoding: enc)

    print("\(hexKey!)")

    // Sample output:
    // 597734C894FF89CFD3B93D925462C24E97724BCB118F6FC919007F5ABC27E768

}