isthisanopenpgpbug.go

// There seem to be problems with "climatically" and "fezzes" as passwords.
// When using "climatically": Program terminates with "openpgp: unsupported feature: public key version"
// When using "fezzes": Program terminates with "openpgp: invalid data: tag byte does not have MSB set"
// Expected behaviour would be a reinvokation of the prompt function in an endless loop until the right password is used.

package main

import (
	"bytes"
	"errors"
	"io/ioutil"
	"log"

	"golang.org/x/crypto/openpgp"
	"golang.org/x/crypto/openpgp/armor"
)

func prompt(keys []openpgp.Key, symmetric bool) ([]byte, error) {

	if !symmetric {
		return nil, errors.New("Decrypting private keys not supported")
	}
	return []byte("climatically"), nil
	// return []byte("fezzes"), nil // also causes error

}

func main() {
	// This message is ecrypted witht the password "password"
	message := []byte(`-----BEGIN PGP MESSAGE-----
Version: GnuPG v1

jA0ECQMCIFOMjWmWTZZg0kABHIkMAZskzkav2QZQAJStGv3k1WuWZt7pVozy1HMV
s25QGzQIE6Yri4K3JJKwCkWVlB69lt6Oq2NqACELxXoT
=zze7
-----END PGP MESSAGE-----`)

	decbuf := bytes.NewBuffer(message)
	result, err := armor.Decode(decbuf)
	if err != nil {
		log.Fatal(err)
	}

	md, err := openpgp.ReadMessage(result.Body, nil, prompt, nil)
	if err != nil {
		log.Fatalln(err)
	}
	bytes, err := ioutil.ReadAll(md.UnverifiedBody)
	println(string(bytes))
}