xref: /aosp_15_r20/external/tink/go/aead/subtle/ind_cpa.go (revision e7b1675dde1b92d52ec075b0a92829627f2c52a5)

// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
////////////////////////////////////////////////////////////////////////////////

package subtle

// INDCPACipher provides an interface for symmetric key ciphers that are
// indistinguishable against chosen-plaintext attacks. Said primitives do not
// provide authentication, thus should not be used directly, but only to
// construct safer primitives such as AEAD.
type INDCPACipher interface {
	// Encrypt encrypts plaintext. The resulting ciphertext is indistinguishable under
	// chosen-plaintext attack. However, it does not have integrity protection.
	Encrypt(plaintext []byte) ([]byte, error)

	// Decrypt decrypts ciphertext and returns the resulting plaintext.
	Decrypt(ciphertext []byte) ([]byte, error)
}