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 04: AES 128, CBC, ZEROS

This example shows how to encrypt plain text using: - AES algorithm - 128-bit key size - ZEROS 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_04 Encryption 128 CBC ZEROS --------
 *
 *  This example shows how to encrypt plain text using:
 *    - AES algorithm
 *    - 128-bit key size
 *    - ZEROS 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:         Alvaro Gonzalez, Yuri Carmona
 */
 
#include "WaspAES.h"

// 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};

// original message on which the algorithm will be applied 
char message[] = "This_is_a_message"; 

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

// Declaration of variable encrypted message 
uint8_t encrypted_message[300]; 


void setup()
{
  // init USB port 
  USB.ON(); 
  USB.println(F("AES_04 example:"));
  USB.println(F("- 128-bit Key Size"));    
  USB.println(F("- CBC Cipher Mode"));   
  USB.println(F("- ZEROS padding"));
  USB.println();   
  
  USB.print(F("\nOriginal message:")); 
  USB.println(message);

  USB.print(F("Original length:")); 
  USB.println((int)strlen(message));
  USB.println();

} 

void loop()
{ 
  ////////////////////////////////////////////////////////////////
  // 1. Encrypt message
  ////////////////////////////////////////////////////////////////
  USB.println(F("1. Encrypt message"));
  
  // 1.1. Calculate length in Bytes of the encrypted message  
  encrypted_length = AES.sizeOfBlocks(message); 

  // 1.2. Calculate encrypted message with CBC cipher mode and ZEROS padding. 
  AES.encrypt(  AES_128
              , password
              , message
              , encrypted_message
              , CBC
              , ZEROS
              , IV); 


  // 1.3. Printing encrypted message    
  USB.print(F("AES Encrypted message:")); 
  AES.printMessage( encrypted_message, encrypted_length); 

  // 1.4. Printing encrypted message's length 
  USB.print(F("AES Encrypted length:")); 
  USB.println( (int)encrypted_length);
  USB.println();

  
  delay(5000);
  USB.println(F("***********************"));

}

Output

H#
AES_04 example:
- 128-bit Key Size
- CBC Cipher Mode
- ZEROS padding


Original message:This_is_a_message
Original length:17

1. Encrypt message
AES Encrypted message: "97E356A0EBECF14C08628989BAFCD1284676F43AA76AF55AAA1763D92C21A4E1"
AES Encrypted length:32

***********************
1. Encrypt message
AES Encrypted message: "97E356A0EBECF14C08628989BAFCD1284676F43AA76AF55AAA1763D92C21A4E1"
AES Encrypted length:32

...

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