Test golang OpenPGP message signing (clearsign).

clearsign_test.go

package repository

import (
	"bytes"
	"crypto/rand"
	"crypto/rsa"
	"fmt"
	"github.com/stretchr/testify/assert"
	"golang.org/x/crypto/openpgp/clearsign"
	"golang.org/x/crypto/openpgp/packet"
	"testing"
	"time"
)

var key *packet.PrivateKey

func init() {
	// generate RSA privatekey
	var err error
	rsaPrivate, err := rsa.GenerateKey(rand.Reader, 1024)
	if err != nil {
		panic(err)
	}
	key = packet.NewRSAPrivateKey(time.Now(), rsaPrivate)
}

func TestSignature(t *testing.T) {
	msg := []byte("hello world\n")

	// sign message
	signedMsg := bytes.NewBuffer(nil)
	dec, err := clearsign.Encode(signedMsg, key, nil)
	if err != nil {
		panic(err)
	}
	dec.Write(msg)
	dec.Close()

	assert.NotEqual(t, msg, signedMsg.String())
	fmt.Println(signedMsg.String())

	// decode singed message and compare with original
	blk, rest := clearsign.Decode(signedMsg.Bytes())
	assert.Zero(t, len(rest))
	assert.Equal(t, blk.Plaintext, msg)
}