func CheckArmor62Frame(frame Frame, typ MessageType) (brand string, err error) {
	var hdr, ftr string
	if hdr, err = frame.GetHeader(); err != nil {
		return "", err
	}
	if ftr, err = frame.GetFooter(); err != nil {
		return "", err
	}
	return CheckArmor62(hdr, ftr, typ)
}
CheckArmor62Frame checks that the frame matches our standard
begin/end frame
package saltpack
import (
	"io"
	"github.com/keybase/saltpack/encoding/basex"
)
var Armor62Params = armorParams{
	BytesPerWord: 15,
	WordsPerLine: 200,
	Punctuation:  byte('.'),
	Encoding:     basex.Base62StdEncoding,
}
func NewArmor62EncoderStream(encoded io.Writer, typ MessageType, brand string) (io.WriteCloser, error) {
	hdr := makeFrame(headerMarker, typ, brand)
	ftr := makeFrame(footerMarker, typ, brand)
	return newArmorEncoderStream(encoded, hdr, ftr, Armor62Params)
}
func Armor62Seal(plaintext []byte, typ MessageType, brand string) (string, error) {
	hdr := makeFrame(headerMarker, typ, brand)
	ftr := makeFrame(footerMarker, typ, brand)
	return armorSeal(plaintext, hdr, ftr, Armor62Params)
}
func NewArmor62DecoderStream(r io.Reader) (io.Reader, Frame, error) {
	return newArmorDecoderStream(r, Armor62Params)
}
func Armor62Open(msg string) (body []byte, header string, footer string, err error) {
	return armorOpen(msg, Armor62Params)
}