150 }

   151 

   152 //

   153 // Low level maintenance

   154 //

   155 

   156 // If the search algorithm backend has been changed, empty out the search cache (the two cache formats are incompatible with each other)

   157 if ( getConfig('last_search_algo') != SEARCH_MODE )

   158 {

   159   if ( !$db->sql_query('DELETE FROM '.table_prefix.'search_cache;') )

   160     $db->_die();

   161   setConfig('last_search_algo', SEARCH_MODE);

   162 }

   163 

   164 // If the AES key size has been changed, bail out and fast

   165 if ( !getConfig('aes_key_size') )

   166 {

   167   setConfig('aes_key_size', AES_BITS);

   168 }

   169 else if ( $ks = getConfig('aes_key_size') )

   170 {

   171   if ( intval($ks) != AES_BITS )

   172   {

   173     grinding_halt('AES key size changed', '<p>Enano has detected that the AES key size in constants.php has been changed. This change cannot be performed after installation, otherwise the private key would have to be re-generated and all passwords would have to be re-encrypted.</p><p>Please change the key size back to ' . $ks . ' bits and reload this page.</p>');

   174   }

   175 }

   176 

   177 // Same for AES block size

   178 if ( !getConfig('aes_block_size') )

   179 {

   180   setConfig('aes_block_size', AES_BLOCKSIZE);

   181 }

   182 else if ( $ks = getConfig('aes_block_size') )

   183 {

   184   if ( intval($ks) != AES_BLOCKSIZE )

   185   {

   186     grinding_halt('AES block size changed', '<p>Enano has detected that the AES block size in constants.php has been changed. This change cannot be performed after installation, otherwise all passwords would have to be re-encrypted.</p><p>Please change the block size back to ' . $ks . ' bits and reload this page.</p>');

   187   }