Revision 0:31def6dfae65, committed 2017-09-27

Comitter:

ajeet3004

Date:

Wed Sep 27 10:16:33 2017 +0000

Commit message:

modified

Changed in this revision

diff -r 000000000000 -r 31def6dfae65 udaes.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/udaes.cpp	Wed Sep 27 10:16:33 2017 +0000
@@ -0,0 +1,54 @@
+#include "mbed.h"
+#include "udaes.h"
+#include "AES.h"
+#include<cstring>
+
+Serial aespc(USBTX,USBRX);             //USB serial pin to print in the console
+AES aes;                               //Object for AES
+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
+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
+char message1[16];     //Character array to store the decrypted message
+char encackmsg[16];    //Character array to store the encrypted message
+
+
+//Function to print the hexadecimal ASCII value of the data taking data and its length as parameters
+void printData(const void* data, size_t length)
+{
+    const char* dataBytes = (const char*)data;   //Casting the data to the character pointers
+    for (size_t i = 0; i < length; i++) {  
+        if ((i % 8) == 0)
+            printf("\n\t");
+        printf("0x%02X, ", dataBytes[i]);       //Print the hexadecimal ASCII value of the respective character
+    }
+    printf("\n");
+}
+
+
+//Function for encryption of data taking char enc[] as a parameter
+char* encryptData(char enc[])
+{
+      printf("\nOriginal message: \"%s\"", enc);                 //Print the message to be encrypted i.e. enc[] 
+     //printData(enc, 16);                                         //Print the hexadecimal ASCII form of the data
+     aes.setup(key, AES::KEY_128, AES::MODE_CBC, iv);            //Setup the configuration of AES in 128 bit and CBC mode
+     aes.encrypt(enc, encackmsg, 16);                            //Encrypt the given message and store it in encackmsg
+     aes.clear();                                                //clear the AES
+     printf("\nEncrypted message: \"%s\"\n", encackmsg);         //Print the encrypted data stored in encackmsg
+     printData(encackmsg, sizeof(encackmsg));                    //Print the hexadecimal ASCII form of the encackmsg
+     char* encstr=encackmsg;                                     //Store the value of encackmsg in encstr
+     return encstr;                                              //Return encstr
+}
+
+
+//Function for decryption of data taking char dec[] as a parameter
+char* decryptData(char dec[])
+{
+     //aespc.printf("\nThe received message is : %s",dec);         //Print the decrypted data to be encrypted i.e. dec[]
+     aes.setup(key, AES::KEY_128, AES::MODE_CBC, iv);            //Setup the configuration of AES in 128 bit and CBC mode
+     aes.decrypt(dec, message1, sizeof(dec));                    //Decrypt the given encrypted data and store it in message1
+     aes.clear();                                                //clear the AES
+     printf("\nDecrypted message: \"%s\"", message1);            //Print the Decrypted data stored in message1
+   //  printData(message1, sizeof(message1));                      //Print the hexadecimal ASCII form of the message1
+     char* decstr=message1;                                      //Store the value of message1 in decstr
+     return decstr;                                              //Return decstr
+
+}
\ No newline at end of file

diff -r 000000000000 -r 31def6dfae65 udaes.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/udaes.h	Wed Sep 27 10:16:33 2017 +0000
@@ -0,0 +1,7 @@
+#include "mbed.h"
+
+void printData(const void*, size_t);
+
+char* encryptData(char []);
+
+char* decryptData(char []);
\ No newline at end of file