// and then a final five dashes.
		endTrailer := rest[endTrailerIndex:]
		endTrailerLen := len(typeLine) + len(pemEndOfLine)
		if len(endTrailer) < endTrailerLen {
			continue
		}

		restOfEndLine := endTrailer[endTrailerLen:]
		endTrailer = endTrailer[:endTrailerLen]
		if !bytes.HasPrefix(endTrailer, typeLine) ||
			!bytes.HasSuffix(endTrailer, pemEndOfLine) {
			continue
		}