gameserver simulation tool

1 files changed, 127 insertions, 0 deletions

diff --git a/common/auth.pl b/common/auth.pl
new file mode 100755
index 0000000..7e00096
--- /dev/null
+++ b/common/auth.pl
@@ -0,0 +1,127 @@
+#!/usr/bin/perl
+
+use strict;
+use warnings;
+
+sub get_validate_string {
+  my ($cipher_string, $secure_string, $enctype) = @_;
+  
+  # use pre-built rotations for enctype 
+  my @enc_chars = ( qw |
+    001 186 250 178 081 000 084 128 117 022 142 142 002 008 054 165 
+    045 005 013 022 082 007 180 034 140 233 009 214 185 038 000 004 
+    006 005 000 019 024 196 030 091 029 118 116 252 080 081 006 022 
+    000 081 040 000 004 010 041 120 081 000 001 017 082 022 006 074 
+    032 132 001 162 030 022 071 022 050 081 154 196 003 042 115 225 
+    045 079 024 075 147 076 015 057 010 000 004 192 018 012 154 094 
+    002 179 024 184 007 012 205 033 005 192 169 065 067 004 060 082 
+    117 236 152 128 029 008 002 029 088 132 001 078 059 106 083 122 
+    085 086 087 030 127 236 184 173 000 112 031 130 216 252 151 139 
+    240 131 254 014 118 003 190 057 041 119 048 224 043 255 183 158 
+    001 004 248 001 014 232 083 255 148 012 178 069 158 010 199 006 
+    024 001 100 176 003 152 001 235 002 176 001 180 018 073 007 031 
+    095 094 093 160 079 091 160 090 089 088 207 082 084 208 184 052 
+    002 252 014 066 041 184 218 000 186 177 240 018 253 035 174 182 
+    069 169 187 006 184 136 020 036 169 000 020 203 036 018 174 204 
+    087 086 238 253 008 048 217 253 139 062 010 132 070 250 119 184 
+  |),
+
+  # convert to array of characters
+  my @cip = split "", $cipher_string;
+  my @sec = split "", $secure_string;
+
+  # length of strings/arrays which should be 6
+  my $sec_len = scalar @sec;
+  my $cip_len = scalar @cip;
+  
+  # from this point on, work with ordinal values
+  for (0..$sec_len-1) { $sec[$_] = ord $sec[$_]; }
+  for (0..$cip_len-1) { $cip[$_] = ord $cip[$_]; }
+  
+  # helper vars
+  my ($i,$j,$k,$l,$m,$n,$p);
+
+  # too short or too long -- return empty string
+  return "" if ($sec_len <= 0 || $sec_len >= 32);
+  return "" if ($cip_len <= 0 || $cip_len >= 32);
+  
+  # temporary array with ascii characters
+  my @enc;
+  for(0..255) {$enc[$_] = $_;}
+
+  $j = 0;
+  for(0..255) {
+      $j += $enc[$_] + $cip[$_ % $cip_len];
+      $j = $j % 256;
+      $l = $enc[$j];
+      $enc[$j] = $enc[$_];
+      $enc[$_] = $l;
+  }
+
+  # store temporary positions  
+  my @tmp;
+  
+  $j = 0;
+  $k = 0;
+  for($i = 0; $sec[$i]; $i++) {
+      $j += $sec[$i] + 1;
+      $j = $j % 256;
+      $l = $enc[$j];
+      $k += $l;
+      $k = $k % 256;
+      $m = $enc[$k];
+      $enc[$k] = $l;
+      $enc[$j] = $m;
+      $tmp[$i] = $sec[$i] ^ $enc[($l + $m) & 0xff];
+  }
+  
+  # part of the enctype 1-2 process
+  for($sec_len = $i; $sec_len % 3; $sec_len++) {
+      $tmp[$sec_len] = 0;
+  }
+  
+  if ($enctype == 1) {
+    for (0..$sec_len-1) {
+      $tmp[$_] = $enc_chars[$tmp[$_]];
+    }
+  }
+  elsif ($enctype == 2) {
+    for (0..$sec_len-1) {
+      $tmp[$_] ^= $cip[$_ % $cip_len];
+    }
+  }  
+  
+  # parse the validate array
+  $p = 0;
+  my @val;
+  for($i = 0; $i < $sec_len; $i += 3) {
+      $l = $tmp[$i];
+      $m = $tmp[$i + 1];
+      $m = $m % 256;
+      $n = $tmp[$i + 2];
+      $n = $n % 256;
+      $val[$p++] = charshift($l >> 2);
+      $val[$p++] = charshift((($l & 3 ) << 4) | ($m >> 4));
+      $val[$p++] = charshift((($m & 15) << 2) | ($n >> 6));
+      $val[$p++] = charshift($n & 63);
+  }
+  
+  # return to ascii characters
+  my $str = "";
+  for (@val) { $str .= chr $_}
+  
+  return $str;
+}
+
+sub charshift {
+  my $reg = shift;
+    return($reg + 65) if ($reg <  26);
+    return($reg + 71) if ($reg <  52);
+    return($reg - 4)  if ($reg <  62);
+    return(43)        if ($reg == 62);
+    return(47)        if ($reg == 63);
+    
+    # if all else fails
+    return(0);
+}
+1;