package des

import (
	"crypto/cipher"
	"crypto/internal/alias"
	"internal/byteorder"
	"strconv"
)

// The DES block size in bytes.
const BlockSize = 8

type KeySizeError int

func (k KeySizeError) Error() string {
	return "crypto/des: invalid key size " + strconv.Itoa(int(k))
}

// desCipher is an instance of DES encryption.
type desCipher struct {
	subkeys [16]uint64
}