package main

import (
    "crypto/rand"
    "fmt"
    "golang.org/x/crypto/chacha20poly1305"
)

func main() {
    // Generate or use a pre-shared key (in real code, this should be properly managed)
    key := make([]byte, chacha20poly1305.KeySize)
    if _, err := rand.Read(key); err != nil {
        // handle error
        return
    }
    fmt.Printf("%x", key)
}