Question

Can you convert this code (Python) to C++

def decrypt(message, key):
    decryptedText = ""
    for i in message:
        M = ord(i)
        k = int(key, 16)
        xor = M ^ k
        decryptedText += chr(xor)
    return decryptedText


def encrypt(message, key):
    encryptedText = ""
    for i in message:
        M = ord(i)
        k = int(key, 16)
        xor = M ^ k
        encryptedText += chr(xor)
    return encryptedText


# main function
userText = input("Enter text: ")
userKey = str(input("Enter a key: "))
encryptedMessage = encrypt(userText, userKey)
decryptedMessage = decrypt(encryptedMessage, userKey)
print("Encrypted message: ", encryptedMessage)
print("Decrypted message: ", decryptedMessage)

Answer 1

Converted C++ code:

#include <bits/stdc++.h>
using namespace std; 

// function to decrypt the message
string decrypt(string message, string key){
    
    string decryptedText = "";
    int k = 0;
    reverse(key.begin(), key.end());
    for (int i = 0; i < key.size(); i++){
        k += (key[i] - '0') * pow(16, i);
    }
    for (char &i: message){
        int M = (int) i;
        int _xor = M ^ k;
        string s(1, static_cast<char>(_xor));
        decryptedText += s;
    }
    return decryptedText;
}

// function to encrypt the message
string encrypt(string message, string key){
    
    string encryptedText = "";
    int k = 0;
    reverse(key.begin(), key.end());
    for (int i = 0; i < key.size(); i++){
        k += (key[i] - '0') * pow(16, i);
    }
    for (char &i: message){
        int M = (int) i;
        int _xor = M ^ k;
        string s(1, static_cast<char>(_xor));
        encryptedText += s;
    }
    return encryptedText;
}

// Main function
int main(){

    // Take input
    string userText, userKey;
    cout << "Enter text: "; cin >> userText;
    cout << "Enter a key: "; cin >> userKey;

    // Call the functions
    string encryptedMessage = encrypt(userText, userKey);
    string decryptedMessage = decrypt(encryptedMessage, userKey);

    // Print the output
    cout << "Encrypted message: " << encryptedMessage << endl;
    cout << "Decrypted message: " << decryptedMessage << endl;

    return 0;
}

Please refer to the following pictures for the source code:

Sample execution of the above code: