code: protected KeySpec newKeySpec(final String privateKey, final byte[] salt,
  		final int iterationCount)
  	{
  		return KeySpecFactory.newPBEKeySpec(privateKey, salt, iterationCount);
  	}
docs: Factory method for creating a new {@link KeySpec} from the given private key. This method is
  invoked in the constructor from the derived classes and can be overridden so users can
  provide their own version of a new {@link KeySpec} from the given private key.
  
  @param privateKey
  the private key
  @param salt
  the salt
  @param iterationCount
  the iteration count
  @return the new {@link KeySpec} from the given private key.