xor_cipher.cpp

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#include <iostream>
#include <string>
#include <cassert>
 
namespace ciphers {
    namespace XOR {   
        std::string encrypt (const std::string &text, const int &key) {
            std::string encrypted_text = ""; // Empty string to store encrypted text
            for (auto &c: text) { // Going through each character
                char encrypted_char = char(c ^ key); // Applying encyption
                encrypted_text += encrypted_char; // Appending encrypted character
            }
            return encrypted_text; // Returning encrypted text
        }
        std::string decrypt (const std::string &text, const int &key) {
            std::string decrypted_text = ""; // Empty string to store decrypted text
            for (auto &c : text) { // Going through each character
                char decrypted_char = char(c ^ key); // Applying decryption
                decrypted_text += decrypted_char; // Appending decrypted character
            }
            return decrypted_text; // Returning decrypted text
        }
    } // namespace XOR
} // namespace ciphers
 
void test() {
    // Test 1
    std::string text1 = "Whipalsh! : Do watch this movie...";
    std::string encrypted1 = ciphers::XOR::encrypt(text1, 17);
    std::string decrypted1 = ciphers::XOR::decrypt(encrypted1, 17);
    assert(text1 == decrypted1);
    std::cout << "Original text : " << text1;
    std::cout << " , Encrypted text (with key = 17) : " << encrypted1;
    std::cout << " , Decrypted text : "<< decrypted1 << std::endl;
    // Test 2
    std::string text2 = "->Valar M0rghulis<-";
    std::string encrypted2 = ciphers::XOR::encrypt(text2, 29);
    std::string decrypted2 = ciphers::XOR::decrypt(encrypted2, 29);
    assert(text2 == decrypted2);
    std::cout << "Original text : " << text2;
    std::cout << " , Encrypted text (with key = 29) : " << encrypted2;
    std::cout << " , Decrypted text : "<< decrypted2 << std::endl;
}
 
int main() {
    // Testing
    test();
    return 0;
}