1 files changed, 80 insertions, 0 deletions
diff --git a/yubiserve-utils.php b/yubiserve-utils.php
new file mode 100644
index 0000000..56669a6
--- /dev/null
+++ b/yubiserve-utils.php
@@ -0,0 +1,80 @@
+<?php
+/*
+YubiServe has been written by Alessio Periloso <nospam *at* periloso.it>
+
+
+This file is based on the work made by Simon Josefsson <simon@josefsson.org>.
+Follows his license:
+
+# Copyright (c) 2010 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)
+{
+  return pack("H*" , $h);
+}
+
+function modhex2hex($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;
+}
+
+?>