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<h1>Using XOR Encryption in C on ARM64</h1>
<p>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.</p>

<h2>XOR Encryption Function</h2>
<pre>
<code class="language-c">
#include &lt;stdio.h&gt;
#include &lt;string.h&gt;

#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 &lt; 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;
}
</code>
</pre>

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

<h2>Compiling and Running the Code</h2>
<p>To compile and run the provided C source code for the ARM64 architecture, follow these steps:</p>
<pre>
<code class="language-sh">
# Compile the code
gcc -o xor_encryption xor_encryption.c

# Run the code
./xor_encryption
</code>
</pre>

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

<p>&nbsp;</p>
