Here you can find the source of getBigInteger(byte[] payload, int offset, int length)
public static BigInteger getBigInteger(byte[] payload, int offset, int length)
//package com.java2s; /**/* www .ja v a 2s . c o m*/ * Copyright 2011 Rafael Bedia * * This file is part of g2spook. * * g2spook is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * g2spook is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with g2spook. If not, see <http://www.gnu.org/licenses/>. */ import java.math.BigInteger; public class Main { public static BigInteger getBigInteger(byte[] payload, int offset, int length) { byte[] arr = new byte[length + 1]; arr[0] = 0; for (int i = 0; i < length; i++) { arr[i + 1] = payload[offset + length - 1 - i]; } return new BigInteger(arr); } }