Simple example of using the ProtonMail/gopenpgp package to quickly create ed25519 keys and then encrypt/decrypt some data.

test.go

package foo

import (
	"github.com/ProtonMail/gopenpgp/v2/crypto"
	"github.com/ProtonMail/gopenpgp/v2/helper"
	"github.com/stretchr/testify/require"
	"testing"
)

func TestGenerateGPGKeys(t *testing.T) {
	name := "bob"
	email := "bob@example.com"
	passphrase := []byte("some random passphrase")

	secretkey, err := crypto.GenerateKey(name, email, "x25519", 0)
	require.NoError(t, err)

	secretkey, err = secretkey.Lock(passphrase)
	require.NoError(t, err)

	skarmor, err := secretkey.Armor()
	pkarmor, err := secretkey.GetArmoredPublicKey()

	// encrypt plain text message using public key
	plaintext := []byte("plain text")
	armor, err := helper.EncryptBinaryMessageArmored(pkarmor, plaintext)
	require.NoError(t, err)

	// decrypt armored encrypted message using the private key and obtain plain text
	decrypted, err := helper.DecryptBinaryMessageArmored(skarmor, passphrase, armor)
	require.NoError(t, err)

	require.Equal(t, plaintext, decrypted)
}