The Tor Browser: mobile/android/base/sync/jpake/BigIntegerHelper.java@6474c204b198 (annotated)

mobile/android/base/sync/jpake/BigIntegerHelper.java@6474c204b198 (annotated)

Wed, 31 Dec 2014 06:09:35 +0100

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 package org.mozilla.gecko.sync.jpake;
 import java.math.BigInteger;
 public class BigIntegerHelper {
   public static byte[] BigIntegerToByteArrayWithoutSign(BigInteger value) {
     byte[] bytes = value.toByteArray();
     if (bytes[0] == (byte) 0) {
       bytes = copyArray(bytes, 1, bytes.length - 1);
     }
     return bytes;
   }
   private static byte[] copyArray(byte[] original, int start, int length) {
     byte[] copy = new byte[length];
     System.arraycopy(original, start, copy, 0,
         Math.min(original.length - start, length));
     return copy;
   }
   /**
    * Convert an array of bytes to a non-negative big integer.
    */
   public static BigInteger ByteArrayToBigIntegerWithoutSign(byte[] array) {
     return new BigInteger(1, array);
   }
   /**
    * Convert a big integer into hex string. If the length is not even, add an
    * '0' character in the beginning to make it even.
    */
   public static String toEvenLengthHex(BigInteger value) {
     String result = value.toString(16);
     if (result.length() % 2 != 0) {
       result = "0" + result;
     }
     return result;
   }
 }