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

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

     1 /* This Source Code Form is subject to the terms of the Mozilla Public

     2  * License, v. 2.0. If a copy of the MPL was not distributed with this

     3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     5 package org.mozilla.gecko.sync.jpake;

     7 import java.math.BigInteger;

     9 public class BigIntegerHelper {

    11   public static byte[] BigIntegerToByteArrayWithoutSign(BigInteger value) {

    12     byte[] bytes = value.toByteArray();

    13     if (bytes[0] == (byte) 0) {

    14       bytes = copyArray(bytes, 1, bytes.length - 1);

    15     }

    16     return bytes;

    17   }

    19   private static byte[] copyArray(byte[] original, int start, int length) {

    20     byte[] copy = new byte[length];

    21     System.arraycopy(original, start, copy, 0,

    22         Math.min(original.length - start, length));

    23     return copy;

    24   }

    26   /**

    27    * Convert an array of bytes to a non-negative big integer.

    28    */

    29   public static BigInteger ByteArrayToBigIntegerWithoutSign(byte[] array) {

    30     return new BigInteger(1, array);

    31   }

    33   /**

    34    * Convert a big integer into hex string. If the length is not even, add an

    35    * '0' character in the beginning to make it even.

    36    */

    37   public static String toEvenLengthHex(BigInteger value) {

    38     String result = value.toString(16);

    39     if (result.length() % 2 != 0) {

    40       result = "0" + result;

    41     }

    42     return result;

    43   }

    44 }

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