This is an encryption program. I need the encrypt and decrypt functions modified

Question

This is an encryption program. I need the encrypt and decrypt functions modified to look different but still do the same job. The basic idea is you are taking an input array of chars, combining it with a key and then mixing it up as you see it. Just needa different way to jumble it up i guess.

#include <iostream>

using namespace std;

#define BLOCK_SIZE 16

// Initialize key array, same size as data array

// The key is just an arbitary collection of bytes, it can be anything as long as they same key's used for encryption/decryption

const char key[] = "a@SDF23hds234u(D";

// Combines data bytes with key bytes then uses arbitary algorithm to jumble the data

void encrypt(char data[]) {

// Add the value of every index in the key to every index in the data array

for (int i = 0; i < BLOCK_SIZE; i++) {

data[i] = data[i] + key[i];

}

// Shift every member in the array left by 1

// So 0123456789012345 -> 1234567890123450

char first = data[0];

for (int i = 0; i < BLOCK_SIZE - 1; i++) {

data[i] = data[i + 1];

}

data[BLOCK_SIZE - 1] = first;

}

// Uses reverse of encryption algorithm to un-jumble data then seperates data bytes from key bytes

void decrypt(char data[]) {

// Shift every member in the array right by 1

// So 1234567890123450 -> 0123456789012345

char last = data[BLOCK_SIZE - 1];

for (int i = BLOCK_SIZE - 1; i >= 0; i--) {

data[i] = data[i - 1];

}

data[0] = last;

// Subtract the values of they key from the values of the data array

for (int i = 0; i < BLOCK_SIZE; i++) {

data[i] = data[i] - key[i];

}

}

int main() {

// Initialize data array

char data[] = "0123456789012345";

cout << "Encyption" << endl << endl << "[Data In]" << endl;

cout << data;

cout << endl << endl;

encrypt(data);

cout << "[Data Out]" << endl;

cout << data;

cout << endl << endl << endl;

cout << "Decryption" << endl << endl << "[Data In]" << endl;

cout << data;

cout << endl << endl;

decrypt(data);

cout << "[Data Out]" << endl;

cout << data;

cin.get();

return 0;

}

Explanation / Answer

#include #include #include #include #include using namespace std; char getmenuselection (char m) { cout > m; switch (m) { case 'e': case 'E': cout

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.