The Tor Browser / file comparison
comparison: mobile/android/base/sync/jpake/BigIntegerHelper.java
mobile/android/base/sync/jpake/BigIntegerHelper.java
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- 6474c204b198
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| -1:000000000000 | 0:0d2630eb3884 |
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| 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/. */ | |
| 4 | |
| 5 package org.mozilla.gecko.sync.jpake; | |
| 6 | |
| 7 import java.math.BigInteger; | |
| 8 | |
| 9 public class BigIntegerHelper { | |
| 10 | |
| 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 } | |
| 18 | |
| 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 } | |
| 25 | |
| 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 } | |
| 32 | |
| 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 } |
