RSA 03: RSA Encryption Frame

This example calculates an encrypted message using the RSA algorithm. For encryption, only the public key is needed. The public key is determined by the modulus and the exponent. The "public key" is (n,e). Where 'n' is the modulus and 'e' is the exponent of the public key

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

/*   
 *  ------ RSA 01 - Calculate encrypted message with RSA --------  
 *   
 *  Explanation: This example calculates an encrypted message 
 *  using the RSA algorithm. For encryption, only the public key is needed.
 *  The public key is determined by the modulus and the exponent. 
 *  The "public key" is (n,e). Where 'n' is the modulus and 'e' is the 
 *  exponent of the public key.
 *   
 *  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 3 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 Gascon  
 *  Implementation:    Alvaro Gonzalez, Yuri Carmona
 */


#include "WaspRSA.h"
#include "WaspFrame.h"

// 1. Declaration of Public key variables 
char public_modulus[] = 
"7ebd3e97454cc46ebcf758a5b0b1ddfc" \ 
"4775878048968cf3b2aaa0e34b8b0553" \ 
"15005c21a4e31404ebe82485ee114918" \ 
"8a5b96605c3f4437ef7deeff30a5eaa4" \ 
"af944c4405a1c3ac1f0d54453194f212" \ 
"ea50d6c04aee07b1c8c9a37661ad9126" \ 
"604f754f7270503f7b61fa7b72367cac" \ 
"7c871203caa31d77aa0616571ecf388b" ;  

// define exponent for public key 'e'
// This key is defined as HEX format:
// 0x00010001 = 65537 which is a prime number
char public_exponent[] = "00010001"; 


char private_exponent[] = 
"4ea5689dbe27310df6bd16895ae844f4" \ 
"33f3beade05d6c021db0bc3dcfb6e90a" \ 
"f15153da9cd33cad012700e30b2436d3" \ 
"bfa7addd05e14c97d949b07132e30283" \ 
"663f39a32662d951d7d53ef92ef39d2e" \ 
"a791689065f656f5ffb5f60c92f91b98" \ 
"1f8127a90235a05d9b82c223d43bce92" \ 
"002b097e6634be3141f480d4e5333341" ;  

char p[] = 
"cada49cc750e4ff40bad216aa2ff3a69" \ 
"c5cbcc6d2a320dd81a098e5a995e30dc" \ 
"f40a0a775130471f3a4ebd364a003f6a" \ 
"65b2a02be98f7394258c51c324f1da03" ;                 

char q[] = 
"9ff1e238eb0217b573239fd0b98fac6a" \ 
"97907f0534e2c59356e637e400e0b8a2" \ 
"497d7f53a614a29991dfb630e5d74b7f" \ 
"95e10c9663a34f67fc65009f51b724d9" ; 

char dp[] = 
"39924a6fa4a93337e83872cb790746e4" \ 
"ce2651168a6b3a52a2d1237dc3196074" \ 
"d52e245a48c892e6e1fd86e5e98ab874" \ 
"d1f8284d4e3450713356e7bda2b6a151" ; 

char dq[] = 
"6c08eafffd2525b4873819dbd76b074f" \ 
"dc5e5a9dbeb22a38326b40773e6c8be9" \ 
"fa6fcd50480f0a2166d9cfeb496459f7" \ 
"acda1d317bcdb4760d927f901d96f249" ;           

char qp[] = 
"513c04961d1c7c762b49f37d02b12538" \ 
"569fc1ad0a158f7ba8c2a1217158b9d9" \ 
"c4b9ca80a989466544d497c233c2dd43" \ 
"51ffe83b760fe8a6de4737ecef77b0ba" ;  


// variable to store the encrypted message
char enc_message[300];



void setup()
{ 
  USB.ON();
  USB.println(F("Example RSA_03\n"));  

  USB.print(F("public_exponent:"));
  USB.println(public_exponent);  
  USB.println();  

  USB.println(F("public_modulus:"));
  RSA.printMessage(public_modulus); 
  USB.println();

} 


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

  // Create new frame (ASCII)
  frame.createFrame(ASCII,"WASP_encrypted"); 

  // set frame fields (String - char*)
  frame.addSensor(SENSOR_STR, (char*) "XBee frame");
  // 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"));

  // Calculating encrypted message 
  RSA.encrypt(frame.buffer
    , frame.length
    , public_exponent
    , public_modulus
    , enc_message
    , sizeof(enc_message)); 

  USB.println(F("-------------------------"));
  USB.println(F("Encrypted message:"));
  USB.println(F("-------------------------"));
  RSA.printMessage(enc_message);
  USB.println(F("-------------------------"));

  USB.println(F("-------------------------"));
  USB.print(F("Encrypted length:"));
  USB.println((int)strlen(enc_message)); 
  USB.println(F("-------------------------"));
  USB.println();


  delay(10000); 

}

Output

H#
Example RSA_03
‌
public_exponent:00010001
‌
public_modulus:
7ebd3e97454cc46ebcf758a5b0b1ddfc
4775878048968cf3b2aaa0e34b8b0553
15005c21a4e31404ebe82485ee114918
8a5b96605c3f4437ef7deeff30a5eaa4
af944c4405a1c3ac1f0d54453194f212
ea50d6c04aee07b1c8c9a37661ad9126
604f754f7270503f7b61fa7b72367cac
7c871203caa31d77aa0616571ecf388b
‌
1. Creating an ASCII frame
===============================
Current ASCII Frame:
Length: 62
Frame Type: 134
frame (HEX): 3C3D3E8602233444334337303633443933373432463423574153505F656E63727970746564233023535452A058426565206672616D65234241543A393823
frame (STR): <=>�#4D3C7063D93742F4#WASP_encrypted#0#STR:XBee frame#BAT:98#
===============================
‌
2. Encrypting Frame
-------------------------
Encrypted message:
-------------------------
322854D2FDDD9673787B1715FA50488A
CF81F09436A9C4A72245CB49253FC337
F0914E4202880D1036C1953E5C8A9593
EDB35784A31DF9932846C3C8592D4300
0E077C262CA2EBE58C284B187B870F81
FAB9772E78FCB9160EB3C53EAFA774C6
D106F8C36176CC396019420EEE1734DC
584CFD0A901506DCDC20F538EC64DACD
‌
-------------------------
-------------------------
Encrypted length:256
-------------------------