gistfile1.txt

case class PasswordHash(salt:Array[Byte], loops:Int, hash:Array[Byte], algorithm:String, keyLength:Int) {
  def hashText(plainText:String):Array[Byte] = PasswordHash.hash(plainText, salt, loops, algorithm, keyLength)
  def challenge(plainText:String):Boolean = java.util.Arrays.equals(hashText(plainText), hash)
}

object PasswordHash {
  def hash(plainText:String):PasswordHash = {
    val algo = "PBKDF2WithHmacSHA512"
    val salt = new java.security.SecureRandom().generateSeed(512/8)
    val loops = 10000
    val length = 512
    PasswordHash(salt, loops, hash(plainText, salt, loops, algo, length), algo, length)
  }

  def hash(plainText:String, salt:Array[Byte], loops:Int, algorithm:String, keyLength:Int):Array[Byte] = {
    val crypt = javax.crypto.SecretKeyFactory.getInstance(algorithm)
    val spec = new javax.crypto.spec.PBEKeySpec(plainText.toCharArray, salt, loops, keyLength)
    val h = crypt.generateSecret(spec).getEncoded
    spec.clearPassword
    h
  }
}