src/frontends/android/app/src/main/java/org/strongswan/android/utils/Utils.java

   1 /*
   2  * Copyright (C) 2014 Tobias Brunner
   3  * Hochschule fuer Technik Rapperswil
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License as published by the
   7  * Free Software Foundation; either version 2 of the License, or (at your
   8  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  12  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * for more details.
  14  */
  15
  16 package org.strongswan.android.utils;
  17
  18
  19 public class Utils
  20 {
  21         static final char[] HEXDIGITS = "0123456789abcdef".toCharArray();
  22
  23         /**
  24          * Converts the given byte array to a hexadecimal string encoding.
  25          *
  26          * @param bytes byte array to convert
  27          * @return hex string
  28          */
  29         public static String bytesToHex(byte[] bytes)
  30         {
  31                 char[] hex = new char[bytes.length * 2];
  32                 for (int i = 0; i < bytes.length; i++)
  33                 {
  34                         int value = bytes[i];
  35                         hex[i*2]   = HEXDIGITS[(value & 0xf0) >> 4];
  36                         hex[i*2+1] = HEXDIGITS[ value & 0x0f];
  37                 }
  38                 return new String(hex);
  39         }
  40 }