Only require apcu, not apcu_bc

Fixes #27

classes/dbcrypt.class.php

    * @return encrypted string or false if DB key not accessible
    */
   public static function encrypt($plaintext) {
-    if (apc_exists('DBKEY')) {
+    if (apcu_exists('DBKEY')) {
       $iv_size = openssl_cipher_iv_length('AES-128-CBC');
       $iv = openssl_random_pseudo_bytes($iv_size);
-      $ret =  base64_encode($iv.openssl_encrypt($plaintext, 'AES-128-CBC', apc_fetch('DBKEY'), OPENSSL_RAW_DATA, $iv));
+      $ret =  base64_encode($iv.openssl_encrypt($plaintext, 'AES-128-CBC', apcu_fetch('DBKEY'), OPENSSL_RAW_DATA, $iv));
       return $ret;
     } else {
       return false;
    * @return decrypted string string or false if DB key not accessible
    */
   public static function decrypt($ciphertext) {
-    if (apc_exists('DBKEY')) {
+    if (apcu_exists('DBKEY')) {
       $iv_size = openssl_cipher_iv_length('AES-128-CBC');
       $iv = substr(base64_decode($ciphertext), 0, $iv_size);
       $ciphertext = substr(base64_decode($ciphertext), $iv_size);
-      return openssl_decrypt($ciphertext, 'AES-128-CBC', apc_fetch('DBKEY'), OPENSSL_RAW_DATA, $iv);
+      return openssl_decrypt($ciphertext, 'AES-128-CBC', apcu_fetch('DBKEY'), OPENSSL_RAW_DATA, $iv);
     } else {
       return false;
     }

classes/script_start.php

      "UPDATE users_sessions
       SET ";
     // Only update IP if we have an encryption key in memory
-    if (apc_exists('DBKEY')) {
+    if (apcu_exists('DBKEY')) {
       $SessionQuery .= "IP = '".DBCrypt::encrypt($_SERVER['REMOTE_ADDR'])."', ";
     }
     $SessionQuery .=
         'SessionID' => $SessionID,
         'Browser' => $Browser,
         'OperatingSystem' => $OperatingSystem,
-        'IP' => ((apc_exists('DBKEY')) ? DBCrypt::encrypt($_SERVER['REMOTE_ADDR']) : $UserSessions[$SessionID]['IP']),
+        'IP' => ((apcu_exists('DBKEY')) ? DBCrypt::encrypt($_SERVER['REMOTE_ADDR']) : $UserSessions[$SessionID]['IP']),
         'LastUpdate' => sqltime() );
     $Cache->insert_front($SessionID, $UsersSessionCache);
     $Cache->commit_transaction(0);
 
   // IP changed
 
-  if (apc_exists('DBKEY') && DBCrypt::decrypt($LoggedUser['IP']) != $_SERVER['REMOTE_ADDR'] && !check_perms('site_disable_ip_history')) {
+  if (apcu_exists('DBKEY') && DBCrypt::decrypt($LoggedUser['IP']) != $_SERVER['REMOTE_ADDR'] && !check_perms('site_disable_ip_history')) {
 
     if (Tools::site_ban_ip($_SERVER['REMOTE_ADDR'])) {
       error('Your IP address has been banned.');

design/privatefooter.php

 <?  if (!empty($LastActive)) { ?>
   <p>
     <a href="user.php?action=sessions">
-      <span class="tooltip" title="Manage sessions">Last activity: </span><?=time_diff($LastActive['LastUpdate'])?><span class="tooltip" title="Manage sessions"> from <?=(apc_exists('DBKEY')?(DBCrypt::decrypt($LastActive['IP'])):'[Encrypted]') ?></span>
+      <span class="tooltip" title="Manage sessions">Last activity: </span><?=time_diff($LastActive['LastUpdate'])?><span class="tooltip" title="Manage sessions"> from <?=(apcu_exists('DBKEY')?(DBCrypt::decrypt($LastActive['IP'])):'[Encrypted]') ?></span>
     </a>
   </p>
 <?  } ?>

design/privateheader.php

           <?=implode(' | ', $ModBar); echo "\n"?>
         </div>
 <?  }
-if (check_perms('site_debug') && !apc_exists('DBKEY')) { ?>
+if (check_perms('site_debug') && !apcu_exists('DBKEY')) { ?>
         <div class="alertbar" style="color: white; background: #B53939;">
           Warning: <a href="tools.php?action=database_key">no DB key</a>
         </div>

sections/ajax/inbox/viewconv.php

 
 $JsonMessages = array();
 while (list($SentDate, $SenderID, $Body, $MessageID) = $DB->next_record()) {
-  $Body = apc_exists('DBKEY') ? DBCrypt::decrypt($Body) : '[Encrypted]';
+  $Body = apcu_exists('DBKEY') ? DBCrypt::decrypt($Body) : '[Encrypted]';
   $JsonMessage = array(
     'messageId' => (int)$MessageID,
     'senderId' => (int)$SenderID,

sections/delete/delete_email.php

   error("Stop that.");
 }
 
-if (!apc_exists('DBKEY')) {
+if (!apcu_exists('DBKEY')) {
   error(403);
 }
 

sections/delete/take_delete_email.php

   error("Stop that.");
 }
 
-if (!apc_exists('DBKEY')) {
+if (!apcu_exists('DBKEY')) {
   error(403);
 }
 

sections/inbox/conversation.php

 <?
 
 while (list($SentDate, $SenderID, $Body, $MessageID) = $DB->next_record()) {
-  $Body = apc_exists('DBKEY') ? DBCrypt::decrypt($Body) : '[Encrypted]';
+  $Body = apcu_exists('DBKEY') ? DBCrypt::decrypt($Body) : '[Encrypted]';
 ?>
   <div class="box vertical_space">
     <div class="head" style="overflow: hidden;">

sections/inbox/get_post.php

   WHERE m.ID = '$PostID'
     AND u.UserID = ".$LoggedUser['ID']);
 list($Body) = $DB->next_record(MYSQLI_NUM);
-$Body = apc_exists('DBKEY') ? DBCrypt::decrypt($Body) : '[Encrypted]';
+$Body = apcu_exists('DBKEY') ? DBCrypt::decrypt($Body) : '[Encrypted]';
 
 // This gets sent to the browser, which echoes it wherever
 

sections/login/index.php

         AND i.ResetKey != ''");
     list($UserID, $Email, $Country, $Expires) = $DB->next_record();
 
-    if (!apc_exists('DBKEY')) {
+    if (!apcu_exists('DBKEY')) {
       error('Database not fully decrypted. Please wait for staff to fix this and try again later');
     }
 
     if (!empty($_REQUEST['email'])) {
       // User has entered email and submitted form
       $Err = $Validate->ValidateForm($_REQUEST);
-      if (!apc_exists('DBKEY')) {
+      if (!apcu_exists('DBKEY')) {
         $Err = 'Database not fully decrypted. Please wait for staff to fix this and try again.';
       }
 
             if ($Enabled == 1) {
 
               // Check if the current login attempt is from a location previously logged in from
-              if (apc_exists('DBKEY')) {
+              if (apcu_exists('DBKEY')) {
                 $DB->query("
                   SELECT IP
                   FROM users_history_ips
                 INSERT INTO users_sessions
                   (UserID, SessionID, KeepLogged, Browser, OperatingSystem, IP, LastUpdate, FullUA)
                 VALUES
-                  ('$UserID', '".db_string($SessionID)."', '1', '$Browser', '$OperatingSystem', '".db_string(apc_exists('DBKEY')?DBCrypt::encrypt($_SERVER['REMOTE_ADDR']):'0.0.0.0')."', '".sqltime()."', '".db_string($_SERVER['HTTP_USER_AGENT'])."')");
+                  ('$UserID', '".db_string($SessionID)."', '1', '$Browser', '$OperatingSystem', '".db_string(apcu_exists('DBKEY')?DBCrypt::encrypt($_SERVER['REMOTE_ADDR']):'0.0.0.0')."', '".sqltime()."', '".db_string($_SERVER['HTTP_USER_AGENT'])."')");
 
               $Cache->begin_transaction("users_sessions_$UserID");
               $Cache->insert_front($SessionID, array(
                   'SessionID' => $SessionID,
                   'Browser' => $Browser,
                   'OperatingSystem' => $OperatingSystem,
-                  'IP' => (apc_exists('DBKEY')?DBCrypt::encrypt($_SERVER['REMOTE_ADDR']):'0.0.0.0'),
+                  'IP' => (apcu_exists('DBKEY')?DBCrypt::encrypt($_SERVER['REMOTE_ADDR']):'0.0.0.0'),
                   'LastUpdate' => sqltime()
                   ));
               $Cache->commit_transaction(0);

sections/register/index.php

   $Val->SetFields('agereq', true, 'checkbox', 'You did not select the box that says you are 18 years of age or older.');
   //$Val->SetFields('captcha', true, 'string', 'You did not enter a captcha code.', array('minlength' => 6, 'maxlength' => 6));
 
-  if (!apc_exists('DBKEY')) {
+  if (!apcu_exists('DBKEY')) {
     $Err = "Registration temporarily disabled due to degraded database access (security measure)";
   }
 

sections/schedule/daily/disable_inactive_users.php

 <?
 //------------- Disable inactive user accounts --------------------------//
 
-if (apc_exists('DBKEY')) {
+if (apcu_exists('DBKEY')) {
   // Send email
   $DB->query("
     SELECT um.Username, um.Email

sections/tools/data/invite_pool.php

     </tr>
 <?
   while (list($UserID, $IP, $InviteKey, $Expires, $Email) = $DB->next_record()) {
-    $IP = apc_exists('DBKEY') ? DBCrypt::decrypt($IP) : '[Encrypted]';
-    $Email = apc_exists('DBKEY') ? DBCrypt::decrypt($Email) : '[Encrypted]';
+    $IP = apcu_exists('DBKEY') ? DBCrypt::decrypt($IP) : '[Encrypted]';
+    $Email = apcu_exists('DBKEY') ? DBCrypt::decrypt($Email) : '[Encrypted]';
 ?>
     <tr class="row">
       <td><?=Users::format_username($UserID, true, true, true, true)?></td>

sections/tools/data/registration_log.php

 <?
   while (list($UserID, $IP, $IPCC, $Email, $Username, $PermissionID, $Uploaded, $Downloaded, $Enabled, $Donor, $Warned, $Joined, $Uses, $InviterID, $InviterIP, $InviterIPCC, $InviterEmail, $InviterUsername, $InviterPermissionID, $InviterUploaded, $InviterDownloaded, $InviterEnabled, $InviterDonor, $InviterWarned, $InviterJoined, $InviterUses) = $DB->next_record()) {
   $RowClass = $IP === $InviterIP ? 'warning' : '';
-  $Email = apc_exists('DBKEY') ? DBCrypt::decrypt($Email) : '[Encrypted]';
-  $IP = apc_exists('DBKEY') ? DBCrypt::decrypt($IP) : '[Encrypted]';
-  $InviterEmail = apc_exists('DBKEY') ? DBCrypt::decrypt($InviterEmail) : '[Encrypted]';
-  $InviterIP = apc_exists('DBKEY') ? DBCrypt::decrypt($InviterIP) : '[Encrypted]';
+  $Email = apcu_exists('DBKEY') ? DBCrypt::decrypt($Email) : '[Encrypted]';
+  $IP = apcu_exists('DBKEY') ? DBCrypt::decrypt($IP) : '[Encrypted]';
+  $InviterEmail = apcu_exists('DBKEY') ? DBCrypt::decrypt($InviterEmail) : '[Encrypted]';
+  $InviterIP = apcu_exists('DBKEY') ? DBCrypt::decrypt($InviterIP) : '[Encrypted]';
 ?>
     <tr class="<?=$RowClass?>">
       <td><?=Users::format_username($UserID, true, true, true, true)?><br /><?=Users::format_username($InviterID, true, true, true, true)?></td>

sections/tools/misc/database_key.php

   if (!FEATURE_SET_ENC_KEY_PUBLIC) {
     authorize();
   }
-  apc_store('DBKEY', hash('sha512', $_POST['dbkey']));
+  apcu_store('DBKEY', hash('sha512', $_POST['dbkey']));
 }
 
 View::show_header('Database Encryption Key');
   <h2>Database Encryption Key</h2>
 </div>
 <div class="box pad slight_margin">
-  <h4>There is <?=((apc_exists('DBKEY') && apc_fetch('DBKEY'))?"already a":"NO")?> key loaded</h4>
+  <h4>There is <?=((apcu_exists('DBKEY') && apcu_fetch('DBKEY'))?"already a":"NO")?> key loaded</h4>
   <form class="create_form" name="db_key" action="" method="post">
     <input type="hidden" name="action" value="database_key" />
     <input type="hidden" name="auth" value="<?=$LoggedUser['AuthKey']?>" />

sections/user/advancedsearch.php

     </tr>
 <?
 while (list($UserID, $Username, $Uploaded, $Downloaded, $Snatched, $Invitees, $Class, $Email, $Enabled, $IP, $Invites, $DisableInvites, $Warned, $Donor, $JoinDate, $LastAccess) = $DB->next_record()) {
-  $IP = apc_exists('DBKEY') ? DBCrypt::decrypt($IP) : '[Encrypted]';
-  $Email = apc_exists('DBKEY') ? DBCrypt::decrypt($Email) : '[Encrypted]';
+  $IP = apcu_exists('DBKEY') ? DBCrypt::decrypt($IP) : '[Encrypted]';
+  $Email = apcu_exists('DBKEY') ? DBCrypt::decrypt($Email) : '[Encrypted]';
 ?>
     <tr>
       <td><?=Users::format_username($UserID, true, true, true, true)?></td>

sections/user/edit.php

 
 $TwoFA = new TwoFactorAuth();
 
-$Email = apc_exists('DBKEY') ? DBCrypt::decrypt($Email) : '[Encrypted]';
+$Email = apcu_exists('DBKEY') ? DBCrypt::decrypt($Email) : '[Encrypted]';
 
 if ($UserID != $LoggedUser['ID'] && !check_perms('users_edit_profiles', $Class)) {
   error(403);

sections/user/invite.php

 <?
   foreach ($Pending as $Invite) {
     list($InviteKey, $Email, $Expires) = $Invite;
-    $Email = apc_exists('DBKEY') ? DBCrypt::decrypt($Email) : '[Encrypted]';
+    $Email = apcu_exists('DBKEY') ? DBCrypt::decrypt($Email) : '[Encrypted]';
 ?>
       <tr class="row">
         <td><?=display_str($Email)?></td>
 <?
   foreach ($Invited as $User) {
     list($ID, $Email, $Uploaded, $Downloaded, $JoinDate, $LastAccess) = $User;
-    $Email = apc_exists('DBKEY') ? DBCrypt::decrypt($Email) : '[Encrypted]'
+    $Email = apcu_exists('DBKEY') ? DBCrypt::decrypt($Email) : '[Encrypted]'
 ?>
       <tr class="row">
         <td><?=Users::format_username($ID, true, true, true, true)?></td>

sections/user/sessions.php

 <?
   foreach ($UserSessions as $Session) {
     list($ThisSessionID, $Browser, $OperatingSystem, $IP, $LastUpdate) = array_values($Session);
-    $IP = apc_exists('DBKEY') ? DBCrypt::decrypt($IP) : '[Encrypted]';
+    $IP = apcu_exists('DBKEY') ? DBCrypt::decrypt($IP) : '[Encrypted]';
 ?>
       <tr class="row">
         <td class="nobr"><?=$IP?></td>

sections/user/take_edit.php

 
 $Err = $Val->ValidateForm($_POST);
 
-if (!apc_exists('DBKEY')) {
+if (!apcu_exists('DBKEY')) {
   $Err = "Cannot edit profile until database fully decrypted.";
 }
 

sections/user/take_invite.php

 
 $UserID = $LoggedUser['ID'];
 
-if (!apc_exists('DBKEY')) {
+if (!apcu_exists('DBKEY')) {
   error('Invites disabled until database decrypted');
   header('Location: user.php?action=invite');
   die();

sections/user/takemoderate.php

 authorize();
 // End checking for moronity
 
-if (!apc_exists('DBKEY')) {
+if (!apcu_exists('DBKEY')) {
   error('Decrypt database first');
 }
 

sections/user/user.php

 $DisableLeech, $JoinDate, $Info, $Avatar, $FLTokens, $BonusPoints, $IRCLines, $Donor, $Warned,
 $ForumPosts, $InviterID, $DisableInvites, $InviterName, $InfoTitle) = $DB->next_record(MYSQLI_NUM, array(9, 11));
 }
-$Email = apc_exists('DBKEY') ? DBCrypt::decrypt($Email) : '[Encrypted]';
+$Email = apcu_exists('DBKEY') ? DBCrypt::decrypt($Email) : '[Encrypted]';
 
 $DB->query("
   SELECT SUM(t.Size)
 <?  }
 
 if (check_perms('users_view_ips', $Class)) {
-  $IP = apc_exists('DBKEY') ? DBCrypt::decrypt($IP) : '[Encrypted]';
+  $IP = apcu_exists('DBKEY') ? DBCrypt::decrypt($IP) : '[Encrypted]';
 ?>
         <li>IP: <?=Tools::display_ip($IP)?></li>
         <li>Host: <?=Tools::get_host_by_ajax($IP)?></li>
 <?
       foreach ($Emails as $Email) {
         list($Address, $IP) = $Email;
-        $IP = apc_exists('DBKEY') ? DBCrypt::decrypt($IP) : '[Encrypted]';
-        $Address = apc_exists('DBKEY') ? DBCrypt::decrypt($Address) : '[Encrypted]';
+        $IP = apcu_exists('DBKEY') ? DBCrypt::decrypt($IP) : '[Encrypted]';
+        $Address = apcu_exists('DBKEY') ? DBCrypt::decrypt($Address) : '[Encrypted]';
 ?>
             <option value="<?=display_str($Address)?>"><?=display_str($Address)?> - <?=display_str($IP)?></option>
 <?    } ?>

sections/userhistory/email_history.php

     $Values['Time'] = $Joined;
   }
 
-  $ValuesIP = apc_exists('DBKEY') ? DBCrypt::decrypt($Values['IP']) : '[Encrypted]';
+  $ValuesIP = apcu_exists('DBKEY') ? DBCrypt::decrypt($Values['IP']) : '[Encrypted]';
 ?>
   <tr class="row">
     <td><?=display_str($Values['Email'])?></td>
             AND ue.UserID != $UserID
             AND um.ID = ue.UserID");
     while (list($UserID2, $Time, $IP) = $DB->next_record()) {
-      $IP = apc_exists('DBKEY') ? DBCrypt::decrypt($IP) : '[Encrypted]';
+      $IP = apcu_exists('DBKEY') ? DBCrypt::decrypt($IP) : '[Encrypted]';
 ?>
   </tr>
   <tr>

sections/userhistory/email_history2.php

       <td>Set from IP</td>
     </tr>
 <?
-$Current['Email'] = apc_exists('DBKEY') ? DBCrypt::decrypt($Current['Email']) : '[Encrypted]';
-$Current['CurrentIP'] = apc_exists('DBKEY') ? DBCrypt::decrypt($Current['CurrentIP']) : '[Encrypted]';
-$Current['IP'] = apc_exists('DBKEY') ? DBCrypt::decrypt($Current['IP']) : '[Encrypted]';
+$Current['Email'] = apcu_exists('DBKEY') ? DBCrypt::decrypt($Current['Email']) : '[Encrypted]';
+$Current['CurrentIP'] = apcu_exists('DBKEY') ? DBCrypt::decrypt($Current['CurrentIP']) : '[Encrypted]';
+$Current['IP'] = apcu_exists('DBKEY') ? DBCrypt::decrypt($Current['IP']) : '[Encrypted]';
 ?>
     <tr class="row">
       <td><?=display_str($Current['Email'])?></td>
 if ($CurrentMatches ?? false) {
   // Match on the current email
   foreach ($CurrentMatches as $Match) {
-    $Match['IP'] = apc_exists('DBKEY') ? DBCrypt::decrypt($Match['IP']) : '[Encrypted]';
+    $Match['IP'] = apcu_exists('DBKEY') ? DBCrypt::decrypt($Match['IP']) : '[Encrypted]';
 ?>
     <tr class="row">
       <td><?=$Match['Username']?></td>
     $Matches = ob_get_contents();
     ob_end_clean();
 
-    $Record['Email'] = apc_exists('DBKEY') ? DBCrypt::decrypt($Record['Email']) : '[Encrypted]';
-    $Record['IP'] = apc_exists('DBKEY') ? DBCrypt::decrypt($Record['IP']) : '[Encrypted]';
+    $Record['Email'] = apcu_exists('DBKEY') ? DBCrypt::decrypt($Record['Email']) : '[Encrypted]';
+    $Record['IP'] = apcu_exists('DBKEY') ? DBCrypt::decrypt($Record['IP']) : '[Encrypted]';
 ?>
     <tr class="row">
       <td><?=display_str($Record['Email'])?><?=(($MatchCount > 0) ? ' <a data-toggle-target="#matches_'.$j.'">('.$MatchCount.')</a>' : '')?></td>
       ++$i;
       // Match email is the same as the invite email
 
-      $Match['IP'] = apc_exists('DBKEY') ? DBCrypt::decrypt($Match['IP']) : '[Encrypted]';
+      $Match['IP'] = apcu_exists('DBKEY') ? DBCrypt::decrypt($Match['IP']) : '[Encrypted]';
 ?>
     <tr class="row hidden" id="matches_invite">
       <td><?=$Match['Username']?></td>
 $Matches = ob_get_contents();
 ob_end_clean();
 
-$Invite['Email'] = apc_exists('DBKEY') ? DBCrypt::decrypt($Invite['Email']) : '[Encrypted]';
-$Invite['IP'] = apc_exists('DBKEY') ? DBCrypt::decrypt($Invite['IP']) : '[Encrypted]';
+$Invite['Email'] = apcu_exists('DBKEY') ? DBCrypt::decrypt($Invite['Email']) : '[Encrypted]';
+$Invite['IP'] = apcu_exists('DBKEY') ? DBCrypt::decrypt($Invite['IP']) : '[Encrypted]';
 ?>
     <tr class="row">
       <td><?=display_str($Invite['Email'])?><?=(($MatchCount > 0) ? ' <a data-toggle-target="#matches_invite">('.$MatchCount.')</a>' : '')?></td>

sections/userhistory/email_history_userview.php

   error(403);
 }
 
-if (!apc_exists('DBKEY')) {
+if (!apcu_exists('DBKEY')) {
   error('The site is currently running with partial database access. Please wait for staff to fully decrypt it');
 }
 

sections/userhistory/ip_history.php

 foreach ($Results as $Index => $Result) {
   list($IP, $StartTime, $EndTime, $UserIDs, $UserStartTimes, $UserEndTimes, $Usernames, $UsersEnabled, $UsersDonor, $UsersWarned) = $Result;
 
-  $IP = apc_exists('DBKEY') ? DBCrypt::decrypt($IP) : '[Encrypted]';
+  $IP = apcu_exists('DBKEY') ? DBCrypt::decrypt($IP) : '[Encrypted]';
 
   $HasDupe = false;
   $UserIDs = explode('|', $UserIDs);

sections/userhistory/password_history.php

   </tr>
 <?
 while (list($ChangeTime, $ChangerIP) = $DB->next_record()) {
-  $ChangerIP = (apc_exists('DBKEY')) ? DBCrypt::decrypt($ChangerIP) : '[Encrypted]';
+  $ChangerIP = (apcu_exists('DBKEY')) ? DBCrypt::decrypt($ChangerIP) : '[Encrypted]';
 ?>
   <tr class="row">
     <td><?=time_diff($ChangeTime)?></td>