| // Copyright 2017 Google Inc. |
| // |
| // 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.subtle; |
| |
| import com.google.crypto.tink.Aead; |
| import java.security.GeneralSecurityException; |
| |
| /** |
| * A helper for DEM (data encapsulation mechanism) of ECIES-AEAD-HKDF. |
| * |
| * @since 1.0.0 |
| */ |
| public interface EciesAeadHkdfDemHelper { |
| /** @return the size of the DEM-key in bytes. */ |
| public int getSymmetricKeySizeInBytes(); |
| |
| /** |
| * Creates a new {@code Aead}-primitive that uses the key material given in 'symmetric_key', which |
| * must be of length dem_key_size_in_bytes(). |
| * |
| * @return the newly created {@code Aead}-primitive. |
| */ |
| public Aead getAead(final byte[] symmetricKeyValue) throws GeneralSecurityException; |
| } |