Development v12

Warning - Product Update

All the resources present on this section belong to Waspmote v12, Waspmote Plug & Sense! v12 and Meshlium v3.8.

If you have a Waspmote v15, Waspmote Plug & Sense! v15 or Meshlium v4.0 please go to the new Development Section.

Check what is your version and what are the differences between the old and the new one in this document.

» AES 08: AES 128, CBC, PKCS with Frame

This example shows how to encrypt a binary message: - AES algorithm - 128-bit key size - PKCS Padding - CBC Cipher Mode

Required Materials

1 x Waspmote
1 x battery

Notes

- The battery has to be connected.
- This example can be executed in Waspmote v12 and Waspmote v15

Code

/*
 *  ------Waspmote AES_08 Encryption 128 ECB PKCS --------
 *
 *  This example shows how to encrypt a binary message:
 *    - AES algorithm
 *    - 128-bit key size
 *    - PKCS Padding
 *    - CBC Cipher Mode  
 *  
 *  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 2 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 "WaspAES.h"
#include "WaspFrame.h"

// Define private key to encrypt message  
char nodeID[] = "node_001"; 

// Define a 16-Byte (AES-128) private key to encrypt message  
char password[] = "libeliumlibelium"; 

// Define Initial Vector
uint8_t IV[16] = { 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E,0x0F};

// Variable for encrypted message's length
uint16_t encrypted_length;

// 2. Declaration of variable encrypted message with enough memory space
uint8_t encrypted_message[300]; 



void setup()
{  
  // init USB port 
  USB.ON();   
  USB.println(F("AES_08 example:"));
  USB.println(F("- 128-bit Key Size"));    
  USB.println(F("- ECB Cipher Mode"));   
  USB.println(F("- PKCS5 padding"));
  USB.println();
  
  // set the node ID
  frame.setID(nodeID); 
} 


void loop()
{ 
  ////////////////////////////////////////////////
  // 1. Create a new Frame
  ////////////////////////////////////////////////
  USB.println(F("1. Creating an ASCII frame"));
  RTC.ON();

  // Create new frame (ASCII)
  frame.createFrame(ASCII); 

  // set frame fields (String - char*)
  frame.addSensor(SENSOR_STR, (char*) "this_is_a_message");
  // set frame fields (Battery sensor - uint8_t)
  frame.addSensor(SENSOR_BAT, (uint8_t) PWR.getBatteryLevel());
  // set frame fields (Temperature in Celsius sensor - float)
  frame.addSensor(SENSOR_IN_TEMP, (float) RTC.getTemperature());

  // Prints frame
  frame.showFrame();
  USB.println();
  
  
  ////////////////////////////////////////////////
  // 2. Encrypt Frame
  ////////////////////////////////////////////////  
  USB.println(F("2. Encrypting Frame"));
  
  
  // 2.1. Calculate length in Bytes of the encrypted message 
  encrypted_length = AES.sizeOfBlocks(frame.length); 
  
  // 2.2. Calculate encrypted message with ECB cipher mode and PKCS5 padding. 
  AES.encrypt(  128
              , password
              , frame.buffer
              , frame.length
              , encrypted_message
              , CBC
              , PKCS5
              , IV); 

  // 2.3. Printing encrypted message    
  USB.print(F("AES Encrypted message:")); 
  AES.printMessage( encrypted_message, encrypted_length); 

  // 2.4. Printing encrypted message's length 
  USB.print(F("AES Encrypted length:")); 
  USB.println( (int)encrypted_length);
  USB.println();
  

  delay(10000);   
  USB.println(F("***********************"));
}

Output

H#
AES_08 example:
- 128-bit Key Size
- ECB Cipher Mode
- PKCS5 padding

1. Creating an ASCII frame
===============================
Current ASCII Frame:
Length: 70
Frame Type: 128
frame (HEX): 3C3D3E800323333837323634353339236E6F64655F3030312330235354523A746869735F69735F615F6D657373616765234241543A363423494E5F54454D503A32302E373523
frame (STR): <=>€#387264539#node_001#0#STR:this_is_a_message#BAT:64#IN_TEMP:20.75#
===============================

2. Encrypting Frame
AES Encrypted message: "5EE419EF3F35475204A7B99FC883B1C755F22DE3F5CEDF0FA4A55F15012E89940B4EC4510E34E63B5F5C2F458C629C9DAC1EF9AEEB1ECC69FF49BEB89B0C021F4190C51A48956ECD961409E2BA2275CA"
AES Encrypted length:80

***********************
1. Creating an ASCII frame
===============================
Current ASCII Frame:
Length: 70
Frame Type: 128
frame (HEX): 3C3D3E800323333837323634353339236E6F64655F3030312331235354523A746869735F69735F615F6D657373616765234241543A363523494E5F54454D503A32302E373523
frame (STR): <=>€#387264539#node_001#1#STR:this_is_a_message#BAT:65#IN_TEMP:20.75#
===============================

2. Encrypting Frame
AES Encrypted message: "5EE419EF3F35475204A7B99FC883B1C77B83C5B263862424E29CDBF75262BA1CF653E7277AC1D00189DDF025B7B00953DCE640F283B7E87C0ED9E18AB56772CCF25610CF90B6C9B05D60E736E321FBA0"
AES Encrypted length:80

...

Quick Publish: