(Swift) PBKDF2 - Derive Key from Password

Demonstrates how to derive a symmetric encryption key from a password using PBKDF2.

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 pw: String? = "password"

    var pwCharset: String? = "utf-8"

    // Such as sha256, sha512
    var hashAlg: String? = "sha256"

    // 16 bytes
    var saltHex: String? = "78578E5A5D63CB0668AB39B21C8637FA"

    var iterationCount: Int = 100000

    // 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(pw, charset: pwCharset, hashAlg: hashAlg, salt: saltHex, iterationCount: iterationCount, outputKeyBitLen: outputBitLen, encoding: enc)

    print("\(hexKey!)")

    // Sample output:
    // AE96E261E32792D0FD6F0E72F8E872D046F7DB4C1FA7C83892EC73C49F461B70

}