static public byte[] decode(final String base32)
    {
        int    i, index, lookup, offset, digit;
        byte[] bytes = new byte[base32.length()*5/8];

        for(i = 0, index = 0, offset = 0; i < base32.length(); i++)
        {
            lookup = base32.charAt(i) - '0';

            /* Skip chars outside the lookup table */
            if ( lookup < 0 || lookup >= base32Lookup.length)
                continue;

            digit = base32Lookup[lookup];

            /* If this digit is not in the table, ignore it */
            if (digit == 0xFF)
                continue;

            if (index <= 3)
            {
                index = (index + 5) % 8;
                if (index == 0)
                {
                   bytes[offset] |= digit;
                   offset++;
                   if(offset>=bytes.length) break;
                }
                else
                   bytes[offset] |= digit << (8 - index);
            }
            else
            {
                index = (index + 5) % 8;
                bytes[offset] |= (digit >>> index);
                offset++;

                if(offset>=bytes.length) break;
                bytes[offset] |= digit << (8 - index);
            }
        }
        return bytes;
    }