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mirror of https://github.com/Yubico/yubikey-ksm.git synced 2024-12-05 00:24:19 +01:00
yubikey-ksm/ykksm-utils.php
2009-02-24 21:27:28 +00:00

79 lines
2.2 KiB
PHP

<?php
# Written by Simon Josefsson <simon@josefsson.org>.
# Copyright (c) 2009 Yubico AB
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#
# * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following
# disclaimer in the documentation and/or other materials provided
# with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
function hex2bin($h)
{
if (!is_string($h)) return null;
$r='';
for ($a=0; $a<strlen($h); $a+=2) {
$r.=chr(hexdec($h{$a}.$h{($a+1)}));
}
return $r;
}
function modhex2hex($m)
{
return strtr ($m, "cbdefghijklnrtuv", "0123456789abcdef");
}
function aes128ecb_decrypt($key,$in)
{
return bin2hex(mcrypt_ecb(MCRYPT_RIJNDAEL_128,
hex2bin($key),
hex2bin($in),
MCRYPT_DECRYPT,
hex2bin('00000000000000000000000000000000')));
}
function calculate_crc($token)
{
$crc = 0xffff;
for ($i = 0; $i < 16; $i++ ) {
$b = hexdec($token[$i*2].$token[($i*2)+1]);
$crc = $crc ^ ($b & 0xff);
for ($j = 0; $j < 8; $j++) {
$n = $crc & 1;
$crc = $crc >> 1;
if ($n != 0) {
$crc = $crc ^ 0x8408;
}
}
}
return $crc;
}
function crc_is_good($token) {
$crc = calculate_crc($token);
return $crc == 0xf0b8;
}
?>