nmode's Git Repositories - signal-cli/blob - src/main/java/org/asamk/signal/util/Hex.java

   1 package org.asamk.signal.util;
   2
   3 public class Hex {
   4
   5     private final static char[] HEX_DIGITS = {
   6             '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
   7     };
   8
   9     private Hex() {
  10     }
  11
  12     public static String toString(byte[] bytes) {
  13         StringBuffer buf = new StringBuffer();
  14         for (final byte aByte : bytes) {
  15             appendHexChar(buf, aByte);
  16             buf.append(" ");
  17         }
  18         return buf.toString();
  19     }
  20
  21     public static String toStringCondensed(byte[] bytes) {
  22         StringBuffer buf = new StringBuffer();
  23         for (final byte aByte : bytes) {
  24             appendHexChar(buf, aByte);
  25         }
  26         return buf.toString();
  27     }
  28
  29     private static void appendHexChar(StringBuffer buf, int b) {
  30         buf.append(HEX_DIGITS[(b >> 4) & 0xf]);
  31         buf.append(HEX_DIGITS[b & 0xf]);
  32     }
  33
  34     public static byte[] toByteArray(String s) {
  35         int len = s.length();
  36         byte[] data = new byte[len / 2];
  37         for (int i = 0; i < len; i += 2) {
  38             data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4) + Character.digit(s.charAt(i + 1), 16));
  39         }
  40         return data;
  41     }
  42 }