mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-06 09:05:45 +00:00
83 lines
3.4 KiB
Java
83 lines
3.4 KiB
Java
/* 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.browserid;
|
|
|
|
|
|
/**
|
|
* Java produces signature in ASN.1 format. Here's some hard-coded encoding and decoding
|
|
* code, courtesy of a comment in
|
|
* <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>.
|
|
*/
|
|
public class ASNUtils {
|
|
/**
|
|
* Decode two short arrays from ASN.1 bytes.
|
|
* @param input to extract.
|
|
* @return length 2 array of byte arrays.
|
|
*/
|
|
public static byte[][] decodeTwoArraysFromASN1(byte[] input) throws IllegalArgumentException {
|
|
if (input == null) {
|
|
throw new IllegalArgumentException("input must not be null");
|
|
}
|
|
if (input.length <= 3)
|
|
throw new IllegalArgumentException("bad length");
|
|
if (input[0] != 0x30)
|
|
throw new IllegalArgumentException("bad encoding");
|
|
if ((input[1] & ((byte) 0x80)) != 0)
|
|
throw new IllegalArgumentException("bad length encoding");
|
|
if (input[2] != 0x02)
|
|
throw new IllegalArgumentException("bad encoding");
|
|
if ((input[3] & ((byte) 0x80)) != 0)
|
|
throw new IllegalArgumentException("bad length encoding");
|
|
byte rLength = input[3];
|
|
if (input.length <= 5 + rLength)
|
|
throw new IllegalArgumentException("bad length");
|
|
if (input[4 + rLength] != 0x02)
|
|
throw new IllegalArgumentException("bad encoding");
|
|
if ((input[5 + rLength] & (byte) 0x80) !=0)
|
|
throw new IllegalArgumentException("bad length encoding");
|
|
byte sLength = input[5 + rLength];
|
|
if (input.length != 6 + sLength + rLength)
|
|
throw new IllegalArgumentException("bad length");
|
|
byte[] rArr = new byte[rLength];
|
|
byte[] sArr = new byte[sLength];
|
|
System.arraycopy(input, 4, rArr, 0, rLength);
|
|
System.arraycopy(input, 6 + rLength, sArr, 0, sLength);
|
|
return new byte[][] { rArr, sArr };
|
|
}
|
|
|
|
/**
|
|
* Encode two short arrays into ASN.1 bytes.
|
|
* @param first array to encode.
|
|
* @param second array to encode.
|
|
* @return array.
|
|
*/
|
|
public static byte[] encodeTwoArraysToASN1(byte[] first, byte[] second) throws IllegalArgumentException {
|
|
if (first == null) {
|
|
throw new IllegalArgumentException("first must not be null");
|
|
}
|
|
if (second == null) {
|
|
throw new IllegalArgumentException("second must not be null");
|
|
}
|
|
byte[] output = new byte[6 + first.length + second.length];
|
|
output[0] = 0x30;
|
|
if (4 + first.length + second.length > 255)
|
|
throw new IllegalArgumentException("bad length");
|
|
output[1] = (byte) (4 + first.length + second.length);
|
|
if ((output[1] & ((byte) 0x80)) != 0)
|
|
throw new IllegalArgumentException("bad length encoding");
|
|
output[2] = 0x02;
|
|
output[3] = (byte) first.length;
|
|
if ((output[3] & ((byte) 0x80)) != 0)
|
|
throw new IllegalArgumentException("bad length encoding");
|
|
System.arraycopy(first, 0, output, 4, first.length);
|
|
output[4 + first.length] = 0x02;
|
|
output[5 + first.length] = (byte) second.length;
|
|
if ((output[5 + first.length] & ((byte) 0x80)) != 0)
|
|
throw new IllegalArgumentException("bad length encoding");
|
|
System.arraycopy(second, 0, output, 6 + first.length, second.length);
|
|
return output;
|
|
}
|
|
}
|