PGP file encryption in golang

pgpTestTool.go

package main

import (
	"archive/zip"
	"fmt"
	"log"
	"os"
	"time"

	"github.com/cryptix/go/logging"
	"golang.org/x/crypto/openpgp"
	"golang.org/x/crypto/openpgp/armor"
	"golang.org/x/crypto/openpgp/packet"
	"golang.org/x/crypto/ssh/terminal"
)

func main() {

	// open ascii armored private key
	from, err := os.Open("my.asc.key")
	logging.CheckFatal(err)
	defer from.Close()

	// decode armor and check key type
	fromBlock, err := armor.Decode(from)
	logging.CheckFatal(err)

	if fromBlock.Type != openpgp.PrivateKeyType {
		logging.CheckFatal(fmt.Errorf("from key type:%s", fromBlock.Type))
	}

	// parse and decrypt decoded key
	fromReader := packet.NewReader(fromBlock.Body)
	fromEntity, err := openpgp.ReadEntity(fromReader)
	logging.CheckFatal(err)

	log.Println("Enter Key Passphrase:")
	pw, err := terminal.ReadPassword(0)
	logging.CheckFatal(err)

	err = fromEntity.PrivateKey.Decrypt(pw)
	logging.CheckFatal(err)

	// open destination key (no ascii armor here)
	to, err := os.Open("mkd.pubkey")
	logging.CheckFatal(err)
	defer to.Close()

	toReader := packet.NewReader(to)
	toEntity, err := openpgp.ReadEntity(toReader)
	logging.CheckFatal(err)

	log.Printf("to: %x", toEntity.PrimaryKey.Fingerprint)
	log.Printf("from: %x", fromEntity.PrimaryKey.Fingerprint)

	// output file
	out, err := os.Create("out.enc")
	logging.CheckFatal(err)
	defer out.Close()

	hints := &openpgp.FileHints{
		IsBinary: true,
		FileName: "test.zip",
		ModTime:  time.Now(),
	}

	// prepare encryption pipe
	encOut, err := openpgp.Encrypt(out, []*openpgp.Entity{toEntity}, fromEntity, hints, nil)
	logging.CheckFatal(err)

	// for fun, lets write a zip file to it created inline
	zipW := zip.NewWriter(encOut)

	t1, err := zipW.Create("test1.de.txt")
	logging.CheckFatal(err)
	fmt.Fprintln(t1, "Hallo Welt")

	t2, err := zipW.Create("test1.en.txt")
	logging.CheckFatal(err)
	fmt.Fprintln(t2, "Hello World - the 2nd")

	logging.CheckFatal(zipW.Flush())
	logging.CheckFatal(zipW.Close())

	// close the encPipe to finish the process
	logging.CheckFatal(encOut.Close())
}