X25519 example in Go

x25519.go

// X25519 example in Go
// Author: layou233
// License: WTFPL
package main

import (
	"crypto/rand"
	"encoding/hex"
	"fmt"
	
	"golang.org/x/crypto/curve25519"
)

func main() {
	var (
		alicePri, bobPri [32]byte
		alicePub, bobPub [32]byte
	)
	rand.Read(alicePri[:])
	rand.Read(bobPri[:])
	curve25519.ScalarBaseMult(&alicePub, &alicePri)
	curve25519.ScalarBaseMult(&bobPub, &bobPri)

	aliceSecret, err := curve25519.X25519(alicePri[:], bobPub[:])
	if err != nil {
		panic(err)
	}

	bobSecret, err := curve25519.X25519(bobPri[:], alicePub[:])
	if err != nil {
		panic(err)
	}

	println(len(aliceSecret))
	fmt.Println(hex.EncodeToString(aliceSecret))
	fmt.Println(hex.EncodeToString(bobSecret))
}