passforios-gopenpgp/armor/armor.go

// Package armor contains a set of helper methods for armoring and unarmoring
// data.
package armor

import (
	"bytes"
	"io"
	"io/ioutil"

	"github.com/ProtonMail/gopenpgp/v2/constants"
	"github.com/ProtonMail/gopenpgp/v2/internal"

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

// ArmorKey armors input as a public key.
func ArmorKey(input []byte) (string, error) {
	return ArmorWithType(input, constants.PublicKeyHeader)
}

// ArmorWithTypeBuffered returns a io.WriteCloser which, when written to, writes
// armored data to w with the given armorType.
func ArmorWithTypeBuffered(w io.Writer, armorType string) (io.WriteCloser, error) {
	return armor.Encode(w, armorType, nil)
}

// ArmorWithType armors input with the given armorType.
func ArmorWithType(input []byte, armorType string) (string, error) {
	var b bytes.Buffer

	w, err := armor.Encode(&b, armorType, internal.ArmorHeaders)

	if err != nil {
		return "", err
	}
	if _, err = w.Write(input); err != nil {
		return "", err
	}
	if err := w.Close(); err != nil {
		return "", err
	}
	return b.String(), nil
}

// Unarmor unarmors an armored key.
func Unarmor(input string) ([]byte, error) {
	b, err := internal.Unarmor(input)
	if err != nil {
		return nil, err
	}
	return ioutil.ReadAll(b.Body)
}