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
Last modified 10mo ago
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