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Signal Protocol cryptography library for Java

There is a newer version: 2.8.1

/**
 * Copyright (C) 2014-2016 Open Whisper Systems
 *
 * Licensed according to the LICENSE file in this repository.
 */
package org.whispersystems.libsignal.util;

import java.io.IOException;

/**
 * Utility for generating hex dumps.
 */
public class Hex {

  private final static char[] HEX_DIGITS = {
    '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
  };

  public static String toString(byte[] bytes) {
    return toString(bytes, 0, bytes.length);
  }

  public static String toString(byte[] bytes, int offset, int length) {
    StringBuffer buf = new StringBuffer();
    for (int i = 0; i < length; i++) {
      appendHexChar(buf, bytes[offset + i]);
      buf.append(", ");
    }
    return buf.toString();
  }

  public static String toStringCondensed(byte[] bytes) {
    StringBuffer buf = new StringBuffer();
    for (int i=0;i> 1];

    for (int i = 0, j = 0; j < len; i++) {
      int f = Character.digit(data[j], 16) << 4;
      j++;
      f = f | Character.digit(data[j], 16);
      j++;
      out[i] = (byte) (f & 0xFF);
    }

    return out;
  }

  private static void appendHexChar(StringBuffer buf, int b) {
    buf.append("(byte)0x");
    buf.append(HEX_DIGITS[(b >> 4) & 0xf]);
    buf.append(HEX_DIGITS[b & 0xf]);
  }

}