question: private static SecretKey generatePBEKey ( char [ ] passphraseOrPin , byte [ ] salt , String algorthm , int iterations , int keyLength ) throws NoSuchAlgorithmException , InvalidKeySpecException , NoSuchProviderException { if ( iterations == 0 ) { iterations = 1000 ; } SecretKeyFactory secretKeyFactory = SecretKeyFactory . getInstance ( algorthm , PROVIDER ) ; KeySpec keySpec = new PBEKeySpec ( passphraseOrPin , salt , iterations , keyLength ) ; SecretKey secretKey = secretKeyFactory . generateSecret ( keySpec ) ; return secretKey ; }
target:  Derive a secure key based on the passphraseOrPin