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// Copyright 2015 The Vanadium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package crypto
// NullControlCipher is a cipher that does nothing.
type NullControlCipher struct{}
func (NullControlCipher) MACSize() int { return 0 }
func (NullControlCipher) Seal(data []byte) error { return nil }
func (NullControlCipher) Open(data []byte) bool { return true }
func (NullControlCipher) Encrypt(data []byte) {}
func (NullControlCipher) Decrypt(data []byte) {}
func (NullControlCipher) ChannelBinding() []byte { return nil }
type disabledControlCipher struct {
macSize int
func (c *disabledControlCipher) MACSize() int { return c.macSize }
// NewDisabledControlCipher returns a cipher that has the correct MACSize, but
// encryption and decryption are disabled.
func NewDisabledControlCipher(c ControlCipher) ControlCipher {
return &disabledControlCipher{macSize: c.MACSize()}