#include<stdio.h>
#include<unistd.h>
#include<stdint.h>
#include<stdlib.h>

void encrypt_block(void* data, uint8_t key){
	uint8_t *typed_data = (uint8_t*)data;
	for(int i = 0; i < 4; i++){
		typed_data[i] += key;
	}
}

// It'll encrypted 
void encrypt_data(void* data, uint8_t key, size_t datasize){
	size_t offset = 0;
	while(offset < datasize){
		encrypt_block(data + offset, key);
		offset += 4;
	}
}

#define BUFSIZE (1024*1024)
int main(int argc, char ** argv){
	uint8_t key = atoi(argv[1]);

	uint8_t buffer[BUFSIZE];
	ssize_t readlen;
	for(;;){
		readlen = read(0, buffer, BUFSIZE);
		if(readlen < 1)
			break;
		encrypt_data(buffer, key, readlen);
		write(1, buffer, readlen);
		write(2, "beep\n", 5);
	}

	
	return 0;
}