String encryption using libsodium.cpp

//#include "stdafx.h"
#include <sodium.h>
#include <iostream>

using namespace std;

#define MESSAGE (const unsigned char *) "test"
#define MESSAGE_LEN 4
#define CIPHERTEXT_LEN (crypto_box_SEALBYTES + MESSAGE_LEN)


int main()
{
	if (sodium_init() < 0) {
		cout << "sodium cannot initialize, exiting...";
		return 1;
	}

	unsigned char mr_pk[crypto_box_PUBLICKEYBYTES]; // public key
	unsigned char mr_sk[crypto_box_SECRETKEYBYTES]; // private key
	crypto_box_keypair(mr_pk, mr_sk); // generates random key pair

	unsigned char ciphertext[CIPHERTEXT_LEN]; // encrypted msg
	crypto_box_seal(ciphertext, MESSAGE, MESSAGE_LEN, mr_pk); // encrypt

	/*
	unsigned char encrypted_display[CIPHERTEXT_LEN+1];
	memcpy(encrypted_display, ciphertext, CIPHERTEXT_LEN);
	encrypted_display[CIPHERTEXT_LEN] = 0;
	cout << "encrypted: " << encrypted_display << "\n";
	*/

	unsigned char decrypted[CIPHERTEXT_LEN - crypto_box_SEALBYTES + 1];
	auto decr_msg = crypto_box_seal_open(decrypted, ciphertext, CIPHERTEXT_LEN, mr_pk, mr_sk); // decrypt

	cout << (decr_msg == 0 ? "Success \n" : "Failure \n");

	if (decr_msg == 0) {
		decrypted[CIPHERTEXT_LEN - crypto_box_SEALBYTES] = 0;
		cout << "Decrypted: " << decrypted;
	}

    return 0;
}