mirror of
https://github.com/Yubico/yubikey-ksm.git
synced 2024-11-29 00:24:14 +01:00
79 lines
2.3 KiB
PHP
79 lines
2.3 KiB
PHP
<?php
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# Written by Simon Josefsson <simon@josefsson.org>.
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# Copyright (c) 2009-2012 Yubico AB
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met:
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#
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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#
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# * Redistributions in binary form must reproduce the above
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# copyright notice, this list of conditions and the following
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# disclaimer in the documentation and/or other materials provided
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# with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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function hex2bin($h)
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{
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if (!is_string($h)) return null;
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$r='';
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for ($a=0; $a<strlen($h); $a+=2) {
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$r.=chr(hexdec($h{$a}.$h{($a+1)}));
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}
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return $r;
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}
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function modhex2hex($m)
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{
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return strtr ($m, "cbdefghijklnrtuv", "0123456789abcdef");
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}
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function aes128ecb_decrypt($key,$in)
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{
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return bin2hex(mcrypt_ecb(MCRYPT_RIJNDAEL_128,
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hex2bin($key),
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hex2bin($in),
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MCRYPT_DECRYPT,
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hex2bin('00000000000000000000000000000000')));
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}
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function calculate_crc($token)
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{
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$crc = 0xffff;
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for ($i = 0; $i < 16; $i++ ) {
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$b = hexdec($token[$i*2].$token[($i*2)+1]);
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$crc = $crc ^ ($b & 0xff);
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for ($j = 0; $j < 8; $j++) {
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$n = $crc & 1;
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$crc = $crc >> 1;
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if ($n != 0) {
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$crc = $crc ^ 0x8408;
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}
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}
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}
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return $crc;
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}
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function crc_is_good($token) {
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$crc = calculate_crc($token);
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return $crc == 0xf0b8;
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}
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?>
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