Using XOR Encryption in C on ARM64

In this tutorial, we will learn how to use XOR encryption in C on ARM64. XOR encryption is a simple and basic encryption technique that can be used to encrypt and decrypt data. This tutorial is aimed at beginners, so we will explain each line of code in detail.

XOR Encryption Function


#include <stdio.h>
#include <string.h>

#define KEY 0xAA // Simple XOR key

// Function to encrypt and decrypt data using XOR
void xor_encrypt_decrypt(char *data, size_t len, char key) {
    for (size_t i = 0; i < len; i++) {
        data[i] ^= key;
    }
}

int main() {
    char message[] = "Hello, World!";
    size_t len = strlen(message);

    printf("Original message: %s\n", message);

    // Encrypt the message
    xor_encrypt_decrypt(message, len, KEY);
    printf("Encrypted message: %s\n", message);

    // Decrypt the message
    xor_encrypt_decrypt(message, len, KEY);
    printf("Decrypted message: %s\n", message);

    return 0;
}

Let's break down the code:

#include <stdio.h>: Includes the standard input/output library.
#include <string.h>: Includes the string handling library.
#define KEY 0xAA: Defines the XOR key for encryption and decryption.
void xor_encrypt_decrypt(char *data, size_t len, char key): Function to encrypt and decrypt data using XOR.
int main(): The main function where the program execution begins.
char message[] = "Hello, World!";: Declares a message to be encrypted and decrypted.
size_t len = strlen(message);: Calculates the length of the message.
printf("Original message: %s\n", message);: Prints the original message.
xor_encrypt_decrypt(message, len, KEY);: Encrypts the message using the XOR key.
printf("Encrypted message: %s\n", message);: Prints the encrypted message.
xor_encrypt_decrypt(message, len, KEY);: Decrypts the message using the XOR key.
printf("Decrypted message: %s\n", message);: Prints the decrypted message.
return 0;: Exits the program.

Compiling and Running the Code

To compile and run the provided C source code for the ARM64 architecture, follow these steps:


# Compile the code
gcc -o xor_encryption xor_encryption.c

# Run the code
./xor_encryption

This will compile the XOR encryption code and run it, displaying the original, encrypted, and decrypted messages.

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