AES 03: AES 256, ECB, PKCS
This example shows how to encrypt plain text using: - AES algorithm - 256-bit key size - PKCS Padding - ECB 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_03 Encryption 128 ECB PKCS --------
*
* This example shows how to encrypt plain text using:
* - AES algorithm
* - 256-bit key size
* - PKCS Padding
* - ECB 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 32-Byte (AES-256) private key to encrypt message
char password[] = "libeliumlibeliumlibeliumlibelium";
// 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_03 example:"));
USB.println(F("- 256-bit Key Size"));
USB.println(F("- ECB Cipher Mode"));
USB.println(F("- PKCS5 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 ECB cipher mode and PKCS5 padding.
AES.encrypt( AES_256
, password
, message
, encrypted_message
, ECB
, PKCS5);
// 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_03 example:
- 256-bit Key Size
- ECB Cipher Mode
- PKCS5 padding
Original message:This_is_a_message
Original length:17
1. Encrypt message
AES Encrypted message: "6707B93E593A2457A7D2B3B7D6C3894DF7B5D83219E4C0EB944E13E0CCFF079C"
AES Encrypted length:32
***********************
1. Encrypt message
AES Encrypted message: "6707B93E593A2457A7D2B3B7D6C3894DF7B5D83219E4C0EB944E13E0CCFF079C"
AES Encrypted length:32
***********************
1. Encrypt message
AES Encrypted message: "6707B93E593A2457A7D2B3B7D6C3894DF7B5D83219E4C0EB944E13E0CCFF079C"
AES Encrypted length:32
***********************
1. Encrypt message
AES Encrypted message: "6707B93E593A2457A7D2B3B7D6C3894DF7B5D83219E4C0EB944E13E0CCFF079C"
AES Encrypted length:32
Last modified 2yr ago
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