Question

Needs to be done in C,

The function shown can be called to reverse the char.

7.5 Bit Encryption 7.5.1 Problem Given a single character, apply a simple bitwise encryption algorithm and return the cipher character. 7.5.2 Preconditions You must provide a series of functions which meet the requirements in the table below. You you may include other functions as long as the requested functions execute correctly. Do not include a main function in your source or header files. You will be performing a simple encryption using bitwise operators. Recall that a character (char) is an 8-bit integer, and thus can be manipulated using bitwise functions. You will receive two integers in addition to the character: a start location and an offset. No values will be given that can break your encryption, so you do not need to check for potential integer overflows. Requirement Conditions Functions int encrypt(int, int, char) Input Parameters An integer start location, an integer offset, and a char to encrypt. Return Value An int representing the encrypted character. Requirement Conditions Functions char decrypt(int, int, int) Input Parameters An integer start location, an integer offset, and an integer cipher to decrypt. Return Value A char representing the decrypted character. Files Required codes.c, codes.h 7.5.3 Postconditions The encryption process should be performed as follows: 1. Reverse the character's binary representation. 2. Convert the reversed character to an integer. 3. Left shift the integer an amount equal to the start value. 4. Right shift the integer an amount equal to the offset value. 5. Return the resultant integer. The decryption process should accept a cipher value and undo the encryption based on the start and offset values it receives. It should then return a character which is the same as the original unencrypted character.

Answer 1

SOLUTION: The solution consist of two codes.

1)main code

2)user defined header file code

you can modify the main code if you wanyt.

codes.c FILE:

/* this program will ask the user to enter one character and 
then it will print the encrypted and decrypted results */

#include <stdio.h>
#include<conio.h>
//This header file includes two function one is to encrypt and other is for decrypt
#include "codes.h"
int main()
{
   char s[2],g;
   int n1;
   //Prompting the user for character
   printf("Enter the character:");
   scanf("%c",s);
   //calling encrypt function which is present in the user defined header file "codes.h"
   n1=encrypt(3,4,s[0]);
   printf("The encrypted output is %d\n",n1);
   //calling decrypt function which is present in the user defined header file "codes.h"
   g=decrypt(3,4,n1);
   printf("The decrypted output is %c\n",g);
    return 0;
}

LTE Web Admin х C Chegg х GDB online Debugger Compiler X New Tab х + c onlinegdb.com Language c Run Debug Stop Share Save { } Beautify main.c codes.h 1- /* this program will ask the user to enter one character and 2 then it will print the encrypted and decrypted results */ 3 4 #include <stdio.h> 5 #include<conio.h> 6 //This header file includes two function one is to encrypt and other is for decrypt 7 #include "codes.h" 8 int main() 9-{ 10 char s[2],g; 11 int n1; 12 //Prompting the user for character 13 printf("Enter the character:"); 14 scanf("%c",s); 15 //calling encrypt function which is present in the user defined header file "codes.h" 16 n1=encrypt(3,4,5[@]); 17 printf("The encrypted output is %d\n", nl); 18 //calling decrypt function which is present in the user defined header file "codes.h" 19 g=decrypt(3,4,n1); 20 printf("The decrypted output is %c\n",g); 21 return 0; 22 } 23 Activate Windows Go to Settings to activate Window Type here to search 29 22:28 10-10-2020

codes.h FILE:

/* this header file consist of two functions 1) encrypt() , 2) decrypt() */
int encrypt(int a,int b, char c)
{
    int reverse=0;
//reversing binary representation of character and converting it into integer    
    for(int i=0;i<8;i++)
    {
       reverse= (reverse<<1)|(c&1);
       c=c>>1;
    }
//Left-shifting the integer value by given amount of starting value
      reverse= reverse<<a;
//Right-shifting the integer value by given amount of offset value
      reverse= reverse>>b;
//returning the encrypt result(which is in integer forn)
      return reverse;
}
char decrypt(int a, int b, int c)
{
    int reverse=0;
//Right-shifting the integer value by given amount of offset value    
    c= c<<b; 
//Left-shifting the integer value by given amount of starting value    
    c= c>>a;
//reversing binary representation of integer and converting it into character
    for(int i=0;i<8;i++)
    {
     reverse= (reverse<<1)|(c&1);
       c=c>>1;
    }
//returning the decrypt result(which is character form)    
    char y=(char)reverse;
    return y;
}

LTE Web Admin х C Chegg х GDB online Debugger Compiler X + c onlinegdb.com Language c 9 reverse Run Debug Stop Share Save {}Beautify main.c codes.h 1 /* this header file consist of two functions 1) encrypt() , 2) decrypt() */ 2 int encrypt(int a,int b, char c) 3 { 4 int reverse=0; 5 //reversing binary representation of character and converting it into integer 6 for(int i=0;i<8;i++) 7 { 8 reverse (reverse< <1)|(c&1); C=C>>1; 10 11 //Left-shifting the integer value by given amount of starting value 12 reverse<<a; 13 //Right-shifting the integer value by given amount of offset value 14 reverse reverse >>b; 15 l/returning the encrypt result(which is in integer forn) 16 return reverse; 17 } 18 char decrypt(int a, int b, int c) 19-{ 20 int reverse=0; 21 //Right-shifting the integer value by given amount of offset value 22 C= c<<b; 23 //Left-shifting the integer value by given amount of starting value 24 C= c>>a; 25 //reversing binary representation of integer and converting it into character 26 for(int i=0;i<8;i++) 27 { 28 reverse (reverse<<1)|(c&1); 29 C=C>>1; 30 31 //returning the decrypt result(which is character form) Activate Windows Go to Settings to activate Window O Type here to search 29 22:29 10-10-2020

28 reverse (reverse<<1)|(c&1); 29 C=C>>1; 30 31 //returning the decrypt result(which is character form) 32 char y=(char)reverse; 33 return y; 34 b Activate Windows Go to Settings to activate Window

SAMPLE OUTPUT:

LTE Web Admin х C Chegg х GDB online Debugger Compiler X + c onlinegdb.com input Enter the character:T The encrypted output is 21 The decrypted output is T - - Program finished with exit code 0 Press ENTER to exit console. Activate Windows Go to Settings to activate Windo O Type here to search 29 22:30 10-10-2020

LTE Web Admin Х C Chegg х GDB online Debugger Compiler X + c onlinegdb.com input Enter the character:s The encrypted output is 103 The decrypted output is s - - Program finished with exit code 0 Press ENTER to exit console. Activate Windows Go to Settings to activate Windo O Type here to search 29 22:30 10-10-2020