| // Copyright 2021 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 com.google.crypto.tink.hybrid.internal; |
| |
| import com.google.errorprone.annotations.Immutable; |
| import java.security.GeneralSecurityException; |
| |
| /** |
| * Interface for Hybrid Public Key Encryption (HPKE) authenticated encryption with associated data |
| * (AEAD). |
| * |
| * <p>HPKE RFC is available at https://www.rfc-editor.org/rfc/rfc9180.html. |
| */ |
| @Immutable |
| interface HpkeAead { |
| /** |
| * Performs authenticated encryption of {@code plaintext} and {@code associatedData} using {@code |
| * key} and {@code nonce} according to the HPKE AEAD specification. |
| * |
| * <p>More details available at |
| * https://www.rfc-editor.org/rfc/rfc9180.html#name-encryption-and-decryption. |
| */ |
| byte[] seal(byte[] key, byte[] nonce, byte[] plaintext, byte[] associatedData) |
| throws GeneralSecurityException; |
| |
| /** |
| * Performs authenticated decryption of {@code ciphertext} and {@code associatedData} using {@code |
| * key} and {@code nonce} according to the HPKE AEAD specification. |
| * |
| * <p>More details available at |
| * https://www.rfc-editor.org/rfc/rfc9180.html#name-encryption-and-decryption. |
| */ |
| byte[] open(byte[] key, byte[] nonce, byte[] ciphertext, byte[] associatedData) |
| throws GeneralSecurityException; |
| |
| /** |
| * Returns the HPKE AEAD algorithm identifier for the underlying AEAD implementation. |
| * |
| * <p>More details at |
| * https://www.rfc-editor.org/rfc/rfc9180.html#name-authenticated-encryption-wi. |
| */ |
| byte[] getAeadId() throws GeneralSecurityException; |
| |
| /** Returns key length (in bytes) for this algorithm (i.e., parameter 'Nk' in HPKE RFC). */ |
| int getKeyLength(); |
| |
| /** Returns nonce length (in bytes) for this algorithm (i.e., parameter 'Nn' in HPKE RFC). */ |
| int getNonceLength(); |
| } |