Irayya Mathad / UDAES

UDAES

Fork of UDAES by Irayya Mathad

udaes.cpp@1:470744ec67c0, 2017-06-13 (annotated)

Committer:
irayya
Date:
Tue Jun 13 03:33:09 2017 +0000
Revision:
1:470744ec67c0
Parent:
0:14f07fd5037f
Child:
2:852dbf21ccf6
proo

Who changed what in which revision?

UserRevisionLine numberNew contents of line
irayya 0:14f07fd5037f 1 #include "mbed.h"
irayya 0:14f07fd5037f 2 #include "udaes.h"
irayya 0:14f07fd5037f 3 #include "AES.h"
irayya 0:14f07fd5037f 4 #include<cstring>
irayya 0:14f07fd5037f 5
irayya 1:470744ec67c0 6 Serial aespc(USBTX,USBRX); //USB serial pin to print in the console
irayya 1:470744ec67c0 7 AES aes; //Object for AES
irayya 0:14f07fd5037f 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
irayya 0:14f07fd5037f 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
irayya 1:470744ec67c0 10 char message1[16]; //Character array to store the decrypted message
irayya 1:470744ec67c0 11 char encackmsg[16]; //Character array to store the encrypted message
irayya 0:14f07fd5037f 12
irayya 1:470744ec67c0 13
irayya 1:470744ec67c0 14 //Function to print the hexadecimal ASCII value of the data taking data and its length as parameters
irayya 0:14f07fd5037f 15 void printData(const void* data, size_t length)
irayya 0:14f07fd5037f 16 {
irayya 1:470744ec67c0 17 const char* dataBytes = (const char*)data; //Casting the data to the character pointers
irayya 1:470744ec67c0 18 for (size_t i = 0; i < length; i++) {
irayya 0:14f07fd5037f 19 if ((i % 8) == 0)
irayya 0:14f07fd5037f 20 printf("\n\t");
irayya 1:470744ec67c0 21 printf("0x%02X, ", dataBytes[i]); //Print the hexadecimal ASCII value of the respective character
irayya 0:14f07fd5037f 22 }
irayya 0:14f07fd5037f 23 printf("\n");
irayya 0:14f07fd5037f 24 }
irayya 0:14f07fd5037f 25
irayya 0:14f07fd5037f 26
irayya 1:470744ec67c0 27 //Function for encryption of data taking char enc[] as a parameter
irayya 0:14f07fd5037f 28 char* encryptData(char enc[])
irayya 0:14f07fd5037f 29 {
irayya 1:470744ec67c0 30 printf("\nOriginal message: \"%s\"", enc); //Print the message to be encrypted i.e. enc[]
irayya 1:470744ec67c0 31 printData(enc, 16); //Print the hexadecimal ASCII form of the data
irayya 0:14f07fd5037f 32 aes.setup(key, AES::KEY_128, AES::MODE_CBC, iv); //Setup the configuration of AES in 128 bit and CBC mode
irayya 1:470744ec67c0 33 aes.encrypt(enc, encackmsg, 16); //Encrypt the given message and store it in encackmsg
irayya 0:14f07fd5037f 34 aes.clear(); //clear the AES
irayya 1:470744ec67c0 35 printf("\nEncrypted message: \"%s\"\n", encackmsg); //Print the encrypted data stored in encackmsg
irayya 1:470744ec67c0 36 printData(encackmsg, sizeof(encackmsg)); //Print the hexadecimal ASCII form of the encackmsg
irayya 1:470744ec67c0 37 char* encstr=encackmsg; //Store the value of encackmsg in encstr
irayya 1:470744ec67c0 38 return encstr; //Return encstr
irayya 0:14f07fd5037f 39 }
irayya 0:14f07fd5037f 40
irayya 0:14f07fd5037f 41
irayya 1:470744ec67c0 42 //Function for decryption of data taking char dec[] as a parameter
irayya 0:14f07fd5037f 43 char* decryptData(char dec[])
irayya 0:14f07fd5037f 44 {
irayya 1:470744ec67c0 45 //aespc.printf("\nThe received message is : %s",dec); //Print the decrypted data to be encrypted i.e. dec[]
irayya 0:14f07fd5037f 46 aes.setup(key, AES::KEY_128, AES::MODE_CBC, iv); //Setup the configuration of AES in 128 bit and CBC mode
irayya 1:470744ec67c0 47 aes.decrypt(dec, message1, 16); //Decrypt the given encrypted data and store it in message1
irayya 0:14f07fd5037f 48 aes.clear(); //clear the AES
irayya 1:470744ec67c0 49 printf("\nDecrypted message: \"%s\"", message1); //Print the Decrypted data stored in message1
irayya 1:470744ec67c0 50 printData(message1, 16); //Print the hexadecimal ASCII form of the message1
irayya 1:470744ec67c0 51 char* decstr=message1; //Store the value of message1 in decstr
irayya 1:470744ec67c0 52 return decstr; //Return decstr
irayya 0:14f07fd5037f 53
irayya 0:14f07fd5037f 54 }