| // 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.daead; |
| |
| import com.google.crypto.tink.proto.AesSivKeyFormat; |
| import com.google.crypto.tink.proto.KeyTemplate; |
| import com.google.crypto.tink.proto.OutputPrefixType; |
| |
| /** |
| * Pre-generated {@code KeyTemplate} for {@code DeterministicAead} keys. One can use these templates |
| * to generate new {@code Keyset} with {@code KeysetHandle}. To generate a new keyset that contains |
| * a single {@code AesSivKey}, one can do: |
| * |
| * <pre> |
| * Config.register(DeterministicAeadConfig.TINK_1_1_0); |
| * KeysetHandle handle = KeysetHandle.generateNew(DeterministicAeadKeyTemplates.AES256_SIV); |
| * DeterministicAead daead = handle.getPrimitive(DeterministicAead.class); |
| * </pre> |
| * |
| * @since 1.1.0 |
| */ |
| public final class DeterministicAeadKeyTemplates { |
| /** A {@code KeyTemplate} that generates new instances of {@code AesSivKey} with a 64-byte key. */ |
| public static final KeyTemplate AES256_SIV = createAesSivKeyTemplate(64); |
| |
| /** |
| * @return a {@code KeyTemplate} containing a {@code AesSivKeyFormat} with some specified |
| * parameters. |
| */ |
| public static KeyTemplate createAesSivKeyTemplate(int keySize) { |
| AesSivKeyFormat format = AesSivKeyFormat.newBuilder().setKeySize(keySize).build(); |
| return KeyTemplate.newBuilder() |
| .setValue(format.toByteString()) |
| .setTypeUrl(new AesSivKeyManager().getKeyType()) |
| .setOutputPrefixType(OutputPrefixType.TINK) |
| .build(); |
| } |
| } |