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Frame 07: Encrypted Frames

This example shows how to encrypt a Waspmote Frame using the Encryption libraries. In this example AES-128 is used. But AES-192 and AES-256 are available too. Regarding the Block Cipher mode, only ECB is supported. And regarding the padding mode: only ZEROS padding is supported. The result for encryption function is stored in 'frame.buffer' and 'frame.length'

Required Materials

1 x Waspmote 1 x MiniUSB wire 1 x Battery

Notes

-Regarding the Block Cipher mode, only ECB is supported. -Regarding the padding mode: only ZEROS padding is supported. -This example can be executed in Waspmote v12 and Waspmote v15.

Code

/*
* ------ FRAME_07 - encrypt Frame --------
*
* Explanation: This example shows how to encrypt a
* Waspmote Frame using the Encryption libraries. In this example
* AES-128 is used. But AES-192 and AES-256 are available too.
* Regarding the Block Cipher mode, only ECB is supported. And
* regarding the padding mode: only ZEROS padding is supported
* The result for encryption function is stored in
* 'frame.buffer' and 'frame.length'
*
* Copyright (C) 2016 Libelium Comunicaciones Distribuidas S.L.
* http://www.libelium.com
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Version: 3.0
* Design: David Gascón
* Implementation: Yuri Carmona
*/
#include <WaspFrame.h>
#include <WaspAES.h>
// define the Waspmote ID
char moteID[] = "node_01";
// Define private 16-Byte key to encrypt message
char password[] = "libeliumlibelium";
void setup()
{
// Init USB port & Accelerometer
USB.ON();
USB.println(F("FRAME_07 example"));
// set RTC on
RTC.ON();
// set the Waspmote ID
frame.setID(moteID);
}
void loop()
{
/////////////////////////////////////////////
// 1. create a new Frame
/////////////////////////////////////////////
USB.println(F("1. Creating an ASCII frame"));
// Create new frame (ASCII)
frame.createFrame(ASCII);
USB.println(F("new Waspmote Frame created"));
// set frame fields (Battery sensor - uint8_t)
frame.addSensor(SENSOR_BAT, (uint8_t) PWR.getBatteryLevel());
USB.println(F("Battery Level added"));
// set frame fields (Temperature in Celsius sensor - float)
frame.addSensor(SENSOR_IN_TEMP, (float) RTC.getTemperature());
USB.println(F("RTC temperature added"));
// Prints frame
frame.showFrame();
USB.println();
delay(2000);
////////////////////////////////////////////////
// 2. Encrypt Waspmote Frame
////////////////////////////////////////////////
USB.println(F("2. Encrypting Frame"));
/* Calculate encrypted message with ECB cipher mode and ZEROS padding
The Encryption options are:
- AES_128
- AES_192
- AES_256
*/
frame.encryptFrame( AES_128, password );
// Show the Encrypted frame via USB port
frame.showFrame();
USB.println();
USB.println(F("*****************************"));
delay(5000);
}

Output

H#
FRAME_07 example
1. Creating an ASCII frame
new Waspmote Frame created
Battery Level added
RTC temperature added
===============================
Current ASCII Frame:
Length: 47
Frame Type: 128
frame (HEX): 3C3D3E800223333837323634353339236E6F64655F30312330234241543A373823494E5F54454D503A32352E353023
frame (STR): <=>€#387264539#node_01#0#BAT:78#IN_TEMP:25.50#
===============================
2. Encrypting Frame
===============================
Current ENCRYPTED Frame:
Length: 65
Frame Type: 97
frame (HEX): 3C3D3E613C1B3015176E6F64655F30312362E6A8D022275CCDD35ED2E4A04E945025DAAAE1423AA4D89BA92DE9FE808DB1E418251A2B848757F1E2767E227C4907
frame (STR): <=>a<0node_01#bæ¨Ð"'\ÍÓ^Òä N”P%ÚªáB:¤Ø›©-éþ€±ä%+„‡Wñâv~"|I
===============================
...

Last modified 2yr ago