x25519

Easy X25519

A simple way to do x25519 key agreements.

Why this?

• Easy to use
• Use curve25519.X25519 for multiplication and not other deprecated methods.
• Small code base
• Use slices of byte instead of [32]byte

Installing

go get github.com/HirbodBehnam/EasyX25519

Usage

This library has three functions.

1. NewX25519: Creates a fresh key pair for x25519 key exchange algorithm.
2. NewX25519FromPrivateKey: Creates a key pair from private key
3. (*KeyPair) GenerateSharedSecret: Pass the other recipient's public key to this command to generate a shared secret

Documentation

https://pkg.go.dev/github.com/HirbodBehnam/EasyX25519

Example

Here is a small example from test file:

package main

import (
	"github.com/HirbodBehnam/EasyX25519"
	"log"
)

func main() {
	// generate keys
	alice, err := x25519.NewX25519()
	if err != nil{
		log.Fatalf("could not genearte key for alice: %s",err.Error())
	}
	log.Printf("Alice public key %x",alice.PublicKey)
	bob, err := x25519.NewX25519()
	if err != nil{
		log.Fatalf("could not genearte key for bob: %s",err.Error())
	}
	log.Printf("Bob public key %x",bob.PublicKey)
	// calculate secret
	s1, err := alice.GenerateSharedSecret(bob.PublicKey)
	if err != nil{
		log.Fatalf("could not get secret for alice: %s",err.Error())
	}
	s2, err := bob.GenerateSharedSecret(alice.PublicKey)
	if err != nil{
		log.Fatalf("could not get secret for bob: %s",err.Error())
	}
	// check if they match
	log.Printf("Alice secret %x",s1)
	log.Printf("Bob secret %x",s2)
}