ajeet prajapati / UDAES

AES MODIFIED

Dependents:   AESslave_modified_test

udaes.cpp@0:f6776e7d319e, 2017-06-20 (annotated)

Committer:
ajeet3004
Date:
Tue Jun 20 05:37:23 2017 +0000
Revision:
0:f6776e7d319e
Modifies AES program

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ajeet3004 0:f6776e7d319e 1 #include "mbed.h"
ajeet3004 0:f6776e7d319e 2 #include "udaes.h"
ajeet3004 0:f6776e7d319e 3 #include "AES.h"
ajeet3004 0:f6776e7d319e 4 #include<cstring>
ajeet3004 0:f6776e7d319e 5
ajeet3004 0:f6776e7d319e 6 Serial aespc(USBTX,USBRX); //USB serial pin to print in the console
ajeet3004 0:f6776e7d319e 7 AES aes; //Object for AES
ajeet3004 0:f6776e7d319e 8 const char key[16] = { 0x2B, 0x7E, 0x15, 0x16, 0x28, 0xAE, 0xD2, 0xA6, 0xAB, 0xF7, 0x15, 0x88, 0x09, 0xCF, 0x4F, 0x3C }; //Key used for AES encryption and decryption
ajeet3004 0:f6776e7d319e 9 const char iv[16] = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F }; //Format used for AES-CBC encryption and decryption
ajeet3004 0:f6776e7d319e 10 char message1[16]; //Character array to store the decrypted message
ajeet3004 0:f6776e7d319e 11 char encackmsg[16]; //Character array to store the encrypted message
ajeet3004 0:f6776e7d319e 12
ajeet3004 0:f6776e7d319e 13
ajeet3004 0:f6776e7d319e 14 //Function to print the hexadecimal ASCII value of the data taking data and its length as parameters
ajeet3004 0:f6776e7d319e 15 void printData(const void* data, size_t length)
ajeet3004 0:f6776e7d319e 16 {
ajeet3004 0:f6776e7d319e 17 const char* dataBytes = (const char*)data; //Casting the data to the character pointers
ajeet3004 0:f6776e7d319e 18 for (size_t i = 0; i < length; i++) {
ajeet3004 0:f6776e7d319e 19 if ((i % 8) == 0)
ajeet3004 0:f6776e7d319e 20 printf("\n\t");
ajeet3004 0:f6776e7d319e 21 printf("0x%02X, ", dataBytes[i]); //Print the hexadecimal ASCII value of the respective character
ajeet3004 0:f6776e7d319e 22 }
ajeet3004 0:f6776e7d319e 23 printf("\n");
ajeet3004 0:f6776e7d319e 24 }
ajeet3004 0:f6776e7d319e 25
ajeet3004 0:f6776e7d319e 26
ajeet3004 0:f6776e7d319e 27 //Function for encryption of data taking char enc[] as a parameter
ajeet3004 0:f6776e7d319e 28 char* encryptData(char enc[])
ajeet3004 0:f6776e7d319e 29 {
ajeet3004 0:f6776e7d319e 30 printf("\nOriginal message: \"%s\"", enc); //Print the message to be encrypted i.e. enc[]
ajeet3004 0:f6776e7d319e 31 //printData(enc, 16); //Print the hexadecimal ASCII form of the data
ajeet3004 0:f6776e7d319e 32 aes.setup(key, AES::KEY_128, AES::MODE_CBC, iv); //Setup the configuration of AES in 128 bit and CBC mode
ajeet3004 0:f6776e7d319e 33 aes.encrypt(enc, encackmsg, 16); //Encrypt the given message and store it in encackmsg
ajeet3004 0:f6776e7d319e 34 aes.clear(); //clear the AES
ajeet3004 0:f6776e7d319e 35 printf("\nEncrypted message: \"%s\"\n", encackmsg); //Print the encrypted data stored in encackmsg
ajeet3004 0:f6776e7d319e 36 printData(encackmsg, sizeof(encackmsg)); //Print the hexadecimal ASCII form of the encackmsg
ajeet3004 0:f6776e7d319e 37 char* encstr=encackmsg; //Store the value of encackmsg in encstr
ajeet3004 0:f6776e7d319e 38 return encstr; //Return encstr
ajeet3004 0:f6776e7d319e 39 }
ajeet3004 0:f6776e7d319e 40
ajeet3004 0:f6776e7d319e 41
ajeet3004 0:f6776e7d319e 42 //Function for decryption of data taking char dec[] as a parameter
ajeet3004 0:f6776e7d319e 43 char* decryptData(char dec[])
ajeet3004 0:f6776e7d319e 44 {
ajeet3004 0:f6776e7d319e 45 //aespc.printf("\nThe received message is : %s",dec); //Print the decrypted data to be encrypted i.e. dec[]
ajeet3004 0:f6776e7d319e 46 aes.setup(key, AES::KEY_128, AES::MODE_CBC, iv); //Setup the configuration of AES in 128 bit and CBC mode
ajeet3004 0:f6776e7d319e 47 aes.decrypt(dec, message1, sizeof(dec)); //Decrypt the given encrypted data and store it in message1
ajeet3004 0:f6776e7d319e 48 aes.clear(); //clear the AES
ajeet3004 0:f6776e7d319e 49 printf("\nDecrypted message: \"%s\"", message1); //Print the Decrypted data stored in message1
ajeet3004 0:f6776e7d319e 50 // printData(message1, sizeof(message1)); //Print the hexadecimal ASCII form of the message1
ajeet3004 0:f6776e7d319e 51 char* decstr=message1; //Store the value of message1 in decstr
ajeet3004 0:f6776e7d319e 52 return decstr; //Return decstr
ajeet3004 0:f6776e7d319e 53
ajeet3004 0:f6776e7d319e 54 }