AES 01: AES 128, ECB, PKCS

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This example shows how to encrypt plain text using: - AES algorithm - 128-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
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/*
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 *  ------Waspmote AES_01 Encryption 128 ECB PKCS --------
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 *
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 *  This example shows how to encrypt plain text using:
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 *    - AES algorithm
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 *    - 128-bit key size
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 *    - PKCS Padding
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 *    - ECB Cipher Mode  
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 *  
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 *  Copyright (C) 2016 Libelium Comunicaciones Distribuidas S.L.
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 *  http://www.libelium.com
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 *
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 *  This program is free software: you can redistribute it and/or modify
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 *  it under the terms of the GNU General Public License as published by
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 *  the Free Software Foundation, either version 2 of the License, or
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 *  (at your option) any later version.
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 * 
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 *  This program is distributed in the hope that it will be useful,
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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *  GNU General Public License for more details.
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 * 
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 *  You should have received a copy of the GNU General Public License
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 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
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 *
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 *  Version:                3.0
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 *  Design:                 David Gascón
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 *  Implementation:         Alvaro Gonzalez, Yuri Carmona
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 */
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#include "WaspAES.h"
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​
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// Define a 16-Byte (AES-128) private key to encrypt message  
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char password[] = "libeliumlibelium"; 
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​
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// original message on which the algorithm will be applied 
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char message[] = "This_is_a_message"; 
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​
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// Variable for encrypted message's length
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uint16_t encrypted_length;
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​
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// Declaration of variable encrypted message 
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uint8_t encrypted_message[300]; 
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​
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​
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​
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void setup()
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{  
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  // init USB port 
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  USB.ON();   
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  USB.println(F("AES_01 example:"));
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  USB.println(F("- 128-bit Key Size"));    
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  USB.println(F("- ECB Cipher Mode"));   
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  USB.println(F("- PKCS5 padding"));
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  USB.println();
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​
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  USB.print(F("\nOriginal message:")); 
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  USB.println(message);
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​
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  USB.print(F("Original length:")); 
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  USB.println((int)strlen(message));
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  USB.println();
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​
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} 
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​
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void loop()
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{   
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  ////////////////////////////////////////////////////////////////
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  // 1. Encrypt message
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  ////////////////////////////////////////////////////////////////
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  USB.println(F("1. Encrypt message"));
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  // 1.1. Calculate length in Bytes of the encrypted message 
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  encrypted_length = AES.sizeOfBlocks(message);
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​
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  // 1.2. Calculate encrypted message with ECB cipher mode and PKCS5 padding. 
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  AES.encrypt(  AES_128
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              , password
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              , message
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              , encrypted_message
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              , ECB
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              , PKCS5); 
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​
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  // 1.3. Printing encrypted message    
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  USB.print(F("AES Encrypted message:")); 
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  AES.printMessage( encrypted_message, encrypted_length); 
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​
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  // 1.4. Printing encrypted message's length 
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  USB.print(F("AES Encrypted length:")); 
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  USB.println( (int)encrypted_length);
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  USB.println();
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​
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  delay(5000);
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  USB.println(F("***********************"));
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​
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}
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Output
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H#
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AES_01 example:
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- 128-bit Key Size
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- ECB Cipher Mode
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- PKCS5 padding
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‌
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Original message:This_is_a_message
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Original length:17
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‌
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1. Encrypt message
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AES Encrypted message: "DEAB54C1B9DC182329B2F4D8F8DB3D6AAAF316444A355697E22E48B503DC8C0C"
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AES Encrypted length:32
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‌
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***********************
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1. Encrypt message
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AES Encrypted message: "DEAB54C1B9DC182329B2F4D8F8DB3D6AAAF316444A355697E22E48B503DC8C0C"
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AES Encrypted length:32
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‌
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***********************
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1. Encrypt message
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AES Encrypted message: "DEAB54C1B9DC182329B2F4D8F8DB3D6AAAF316444A355697E22E48B503DC8C0C"
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Last modified 1yr ago
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