The Tor Browser / file comparison
comparison: mobile/android/base/browserid/ASNUtils.java
mobile/android/base/browserid/ASNUtils.java
- branch
- TOR_BUG_3246
- changeset 4
- fc2d59ddac77
equal
deleted
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replaced
| -1:000000000000 | 0:ea193ce34de1 |
|---|---|
| 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.browserid; | |
| 6 | |
| 7 | |
| 8 /** | |
| 9 * Java produces signature in ASN.1 format. Here's some hard-coded encoding and decoding | |
| 10 * code, courtesy of a comment in | |
| 11 * <a href="http://stackoverflow.com/questions/10921733/how-sign-method-of-the-digital-signature-combines-the-r-s-values-in-to-array">http://stackoverflow.com/questions/10921733/how-sign-method-of-the-digital-signature-combines-the-r-s-values-in-to-array</a>. | |
| 12 */ | |
| 13 public class ASNUtils { | |
| 14 /** | |
| 15 * Decode two short arrays from ASN.1 bytes. | |
| 16 * @param input to extract. | |
| 17 * @return length 2 array of byte arrays. | |
| 18 */ | |
| 19 public static byte[][] decodeTwoArraysFromASN1(byte[] input) throws IllegalArgumentException { | |
| 20 if (input == null) { | |
| 21 throw new IllegalArgumentException("input must not be null"); | |
| 22 } | |
| 23 if (input.length <= 3) | |
| 24 throw new IllegalArgumentException("bad length"); | |
| 25 if (input[0] != 0x30) | |
| 26 throw new IllegalArgumentException("bad encoding"); | |
| 27 if ((input[1] & ((byte) 0x80)) != 0) | |
| 28 throw new IllegalArgumentException("bad length encoding"); | |
| 29 if (input[2] != 0x02) | |
| 30 throw new IllegalArgumentException("bad encoding"); | |
| 31 if ((input[3] & ((byte) 0x80)) != 0) | |
| 32 throw new IllegalArgumentException("bad length encoding"); | |
| 33 byte rLength = input[3]; | |
| 34 if (input.length <= 5 + rLength) | |
| 35 throw new IllegalArgumentException("bad length"); | |
| 36 if (input[4 + rLength] != 0x02) | |
| 37 throw new IllegalArgumentException("bad encoding"); | |
| 38 if ((input[5 + rLength] & (byte) 0x80) !=0) | |
| 39 throw new IllegalArgumentException("bad length encoding"); | |
| 40 byte sLength = input[5 + rLength]; | |
| 41 if (input.length != 6 + sLength + rLength) | |
| 42 throw new IllegalArgumentException("bad length"); | |
| 43 byte[] rArr = new byte[rLength]; | |
| 44 byte[] sArr = new byte[sLength]; | |
| 45 System.arraycopy(input, 4, rArr, 0, rLength); | |
| 46 System.arraycopy(input, 6 + rLength, sArr, 0, sLength); | |
| 47 return new byte[][] { rArr, sArr }; | |
| 48 } | |
| 49 | |
| 50 /** | |
| 51 * Encode two short arrays into ASN.1 bytes. | |
| 52 * @param first array to encode. | |
| 53 * @param second array to encode. | |
| 54 * @return array. | |
| 55 */ | |
| 56 public static byte[] encodeTwoArraysToASN1(byte[] first, byte[] second) throws IllegalArgumentException { | |
| 57 if (first == null) { | |
| 58 throw new IllegalArgumentException("first must not be null"); | |
| 59 } | |
| 60 if (second == null) { | |
| 61 throw new IllegalArgumentException("second must not be null"); | |
| 62 } | |
| 63 byte[] output = new byte[6 + first.length + second.length]; | |
| 64 output[0] = 0x30; | |
| 65 if (4 + first.length + second.length > 255) | |
| 66 throw new IllegalArgumentException("bad length"); | |
| 67 output[1] = (byte) (4 + first.length + second.length); | |
| 68 if ((output[1] & ((byte) 0x80)) != 0) | |
| 69 throw new IllegalArgumentException("bad length encoding"); | |
| 70 output[2] = 0x02; | |
| 71 output[3] = (byte) first.length; | |
| 72 if ((output[3] & ((byte) 0x80)) != 0) | |
| 73 throw new IllegalArgumentException("bad length encoding"); | |
| 74 System.arraycopy(first, 0, output, 4, first.length); | |
| 75 output[4 + first.length] = 0x02; | |
| 76 output[5 + first.length] = (byte) second.length; | |
| 77 if ((output[5 + first.length] & ((byte) 0x80)) != 0) | |
| 78 throw new IllegalArgumentException("bad length encoding"); | |
| 79 System.arraycopy(second, 0, output, 6 + first.length, second.length); | |
| 80 return output; | |
| 81 } | |
| 82 } |
