Hi,
I will definitely not get out of this encryption problem.
Here my last request.
With this following code, I can encrypt a local file and send it via FTP.
require 'sched'
require 'print'
local pack = require 'pack' -- library used for the print hex function
local devicetree = require 'devicetree' -- access to system variables like eg serial number, UART reservations
local system = require 'system' -- system lib
local sched = require "sched" -- Lua scheduling and synchronization lib
local serial = require "serial" -- access to serial APIs
local os = require "os" -- Operating System lib
local airvantage = require "airvantage" -- AirVantage lib
local string = require "string" -- String parsing lib
local ftp = require'socket.ftp' -- FTP lib
local timer = require'timer' -- timer lib
local lock = require'sched.lock' -- lock lib
local cipher = require 'crypto.cipher'
local message = [[
DATE;TRAME
02/09/2015 00:00:00;681944AE0C1402301001077AE00001002F2F0F7F010101E600017216
02/09/2015 00:01:00;681B44AE0C9503201001077A5C0000002F2F0F7F0202010201A101013C16
02/09/2015 00:00:00;681944AE0C1402301001077AE00001002F2F0F7F010101E600017216
02/09/2015 00:01:00;681B44AE0C9503201001077A5C0000002F2F0F7F0202010201A101013C16
02/09/2015 00:00:00;681944AE0C1402301001077AE00001002F2F0F7F010101E600017216
02/09/2015 00:01:00;681B44AE0C9503201001077A5C0000002F2F0F7F0202010201A101013C16
02/09/2015 00:00:00;681944AE0C1402301001077AE00001002F2F0F7F010101E600017216
02/09/2015 00:01:00;681B44AE0C9503201001077A5C0000002F2F0F7F0202010201A101013C16
02/09/2015 00:00:00;681944AE0C1402301001077AE00001002F2F0F7F010101E600017216
02/09/2015 00:01:00;681B44AE0C9503201001077A5C0000002F2F0F7F0202010201A101013C16
02/09/2015 00:00:00;681944AE0C1402301001077AE00001002F2F0F7F010101E600017216
02/09/2015 00:01:00;681B44AE0C9503201001077A5C0000002F2F0F7F0202010201A101013C16
02/09/2015 00:00:00;681944AE0C1402301001077AE00001002F2F0F7F010101E600017216
02/09/2015 00:01:00;681B44AE0C9503201001077A5C0000002F2F0F7F0202010201A101013C16
]]
local encrypted_message
-- variable for radio link state
local state
-- variable for signal strength
local signalstrength
function FTP(string)
local content
local file_to_send
local Heure_FTP = os.date("%H")
local FTP_Success = 0
print("inside FTP, UART file selection: ", string)
-- append time in file name
local file_name = string .. '\95' .. ".csv"
print("Nom de fichier:", file_name)
-- create string argument for the FTP call
local put_argument = "ftp://isiobox:c2MjBu@ftp.techosb.com/_TEST/MODEM/" .. file_name
-- get rssi and radio state just before triggering FTP, and log them
-- state equals 0 means: radio link is down
-- state equals 1 means: radio link is up
-- state equals 2 means: radio link is inactive
state = devicetree.get('system.cellular.link.state')
signalstrength = devicetree.get('system.cellular.link.rssi')
print("radio link state just before triggering FTP: ", state)
print("rssi just before triggering FTP: ", signalstrength)
-- FTP the file
local e, f = ftp.put(put_argument, encrypted_message)
sched.wait(15)
-- e is the number of bytes of the FTP file
print("FTP return e: ", e)
-- f is nil in case of FTP success
print("FTP return f: ", f)
-- !!! foresee actions in case of error to the FTP call, eg retries, and prevent erasing file in below loop
-- take care to memory limit of 8MB space if files are continuously appended with new data and not regularly flushed
end
local function main()
devicetree.init()
system.init()
--initialize cipher aes-128 with chaining ctr to encrypt
--key must be 16 characters (128 bits)
--initial vector (iv) is must be 16 characters (128 bits)
local aesctr_enc, err = cipher.new({name="aes", mode="enc", key="0123456789ABCDEF"},{name="ctr",iv="0123456789ABCDEF"})
if not aesctr_enc then
print(err)
return
end
print("cipher OK")
print(message)
--encrypt
encrypted_message = aesctr_enc:process(message)
print(encrypted_message)
end
sched.run(main)
timer.new("03 * * * *", FTP, "LUA_Crypt")
sched.loop()Then I can get back the file on the FTP on my computer (in local) and I can decrypt normaly the file with the following request :
openssl enc -d -aes-128-ctr -K 30313233343536373839414243444546 -iv 30313233343536373840414243444546 -in C:\Users\sebastien.vitrai\Desktop\Encryption\IN\LUA_Test_V1_150924_09.csv -out C:\Users\sebastien.vitrai\Desktop\Encryption\OUT\LUA_Encypt_OK.csvThis method works good.
But when I use my LUA program, I can’t decrypt a file.
My program consist to read data on the serial port and store it.
I write the data on two file in RAM. I d’ont want to use Flash Memory. See the following code :
local Fichier_1 = "DATE;TRAME"..'\10'
local Fichier_2 = "DATE;TRAME"..'\10'
function checkintegrity(buffer)
....
--From UART
if string.byte(buffer,g+length+2) == 22 and string.byte(buffer,g+3) == 174 and string.byte(buffer,g+4) == 12 then
then
print("Product Enless and 16 found, Trame complete")
local trame = tohex(string.sub(buffer, g, g+length+2))
print("la trame est :", trame)
if Heure%2 ~= 0 then
Fichier_1 = Fichier_1 .. os.date("%Y/%m/%d")..'\32'.. os.date("%H:%M:%S") ..';'.. tohex(string.sub(buffer, g, g+length+2)) ..'\10'
print ("Fichier 1:")
print (Fichier_1)
g = string.find (buffer, '\104', Fin_Trame)
print ("Position dans le buffer :",g)
else
Fichier_2 = Fichier_2 .. os.date("%Y/%m/%d")..'\32'.. os.date("%H:%M:%S") ..';'.. tohex(string.sub(buffer, g, g+length+2)) ..'\10'
print ("Fichier 2:")
print (Fichier_2)
g = string.find (buffer, '\104', Fin_Trame)
print ("Position dans le buffer :",g)
end
......
end
endI write in hexadecimal in the two file and when I use the same request to decrypt :
openssl enc -d -aes-128-ctr -K 30313233343536373839414243444546 -iv 30313233343536373840414243444546 -in C:\Users\sebastien.vitrai\Desktop\Encryption\IN\LUA_Test_V1_150924_09.csv -out C:\Users\sebastien.vitrai\Desktop\Encryption\OUT\LUA_Encypt_OK.csvIt doesn’t work. It decrypt only the header : “DATE;TRAME”.
I think it doesn’t work because I write in hexadecimale in my files, but what is the solution without use flash memory ?
If you have an other solution to encrypt, I’m more than interrested.
Thank you in advance,
Sebastien