example of using golang box to encrypt / decrypt

box.go

package crypt

import (
	crypto_rand "crypto/rand"
	"encoding/hex"
	"io"

	"golang.org/x/crypto/nacl/box"
)

func GenerateKey() (string, string) {
	publicKey, privateKey, err := box.GenerateKey(crypto_rand.Reader)
	if err != nil {
		panic(err)
	}
	return hex.EncodeToString(publicKey[:]), hex.EncodeToString(privateKey[:])
}

func Encrypt(publicKey [32]byte, privateKey [32]byte, message []byte) []byte {
	var nonce [24]byte
	if _, err := io.ReadFull(crypto_rand.Reader, nonce[:]); err != nil {
		panic(err)
	}
	encrypted := box.Seal(nonce[:], message, &nonce, &publicKey, &privateKey)
	return encrypted
}

func Decrypt(publicKey [32]byte, privateKey [32]byte, encrypted []byte) []byte {
	var nonce [24]byte
	copy(nonce[:], encrypted[:24])
	decrypted, ok := box.Open(nil, encrypted[24:], &nonce, &publicKey, &privateKey)
	if !ok {
		panic("decryption failed")
	}
	return decrypted
}