--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mod_s2s_v6mesh/base32.lib.lua	Tue Mar 17 16:37:04 2026 +0000
@@ -0,0 +1,138 @@
+--[[
+ borrowed from basexx library for Lua, under MIT License (MIT)
+ Copyright (c) 2013 aiq
+The MIT License (MIT)
+
+Copyright (c) 2013 aiq
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+----------------------------------------------------------------------------]]
+
+local function ignore_set( str, set )
+   if set then
+      str = str:gsub( "["..set.."]", "" )
+   end
+   return str
+end
+
+local function divide_string( str, max )
+   local result = {}
+
+   local start = 1
+   for i = 1, #str do
+      if i % max == 0 then
+         table.insert( result, str:sub( start, i ) )
+         start = i + 1
+      elseif i == #str then
+         table.insert( result, str:sub( start, i ) )
+      end
+   end
+
+   return result
+end
+
+function to_bit( str )
+   return ( str:gsub( '.', function ( c )
+               local byte = string.byte( c )
+               local bits = {}
+               for _ = 1,8 do
+                  table.insert( bits, byte % 2 )
+                  byte = math.floor( byte / 2 )
+               end
+               return table.concat( bits ):reverse()
+            end ) )
+end
+
+local function number_to_bit( num, length )
+   local bits = {}
+
+   while num > 0 do
+      local rest = math.floor( math.fmod( num, 2 ) )
+      table.insert( bits, rest )
+      num = ( num - rest ) / 2
+   end
+
+   while #bits < length do
+      table.insert( bits, "0" )
+   end
+
+   return string.reverse( table.concat( bits ) )
+end
+
+local function pure_from_bit( str )
+   return ( str:gsub( '........', function ( cc )
+               return string.char( tonumber( cc, 2 ) )
+            end ) )
+end
+
+local function unexpected_char_error( str, pos )
+   local c = string.sub( str, pos, pos )
+   return string.format( "unexpected character at position %d: '%s'", pos, c )
+end
+
+local function from_basexx( str, alphabet, bits )
+   local result = {}
+   for i = 1, #str do
+      local c = string.sub( str, i, i )
+      if c ~= '=' then
+         local index = string.find( alphabet, c, 1, true )
+         if not index then
+            return nil, unexpected_char_error( str, i )
+         end
+         table.insert( result, number_to_bit( index - 1, bits ) )
+      end
+   end
+
+   local value = table.concat( result )
+   local pad = #value % 8
+   return pure_from_bit( string.sub( value, 1, #value - pad ) )
+end
+
+local function to_basexx( str, alphabet, bits, pad )
+   local bitString = to_bit( str )
+
+   local chunks = divide_string( bitString, bits )
+   local result = {}
+   for _,value in ipairs( chunks ) do
+      if ( #value < bits ) then
+         value = value .. string.rep( '0', bits - #value )
+      end
+      local pos = tonumber( value, 2 ) + 1
+      table.insert( result, alphabet:sub( pos, pos ) )
+   end
+
+   table.insert( result, pad )
+   return table.concat( result )
+end
+
+local base32Alphabet = "abcdefghijklmnopqrstuvwxyz234567"
+local base32PadMap = { "", "======", "====", "===", "=" }
+
+local function from_base32( str, ignore )
+   str = ignore_set( str, ignore )
+   return from_basexx( string.lower( str ), base32Alphabet, 5 )
+end
+
+function to_base32( str )
+   return to_basexx( str, base32Alphabet, 5, base32PadMap[ #str % 5 + 1 ] )
+end
+
+return {
+	decode = from_base32;
+	encode = to_base32;
+};