com.google.crypto.tink.daead.DeterministicAeadKeyTemplates Maven / Gradle / Ivy
// 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.
*
* We recommend to avoid this class in order to keep dependencies small.
*
*
* - Using this class adds a dependency on protobuf. We hope that eventually it is possible to
* use Tink without a dependency on protobuf.
*
- Using this class adds a dependency on classes for all involved key types.
*
*
* These dependencies all come from static class member variables, which are initialized when the
* class is loaded. This implies that static analysis and code minimization tools (such as proguard)
* cannot remove the usages either.
*
* Instead, we recommend to use {@code KeysetHandle.generateEntryFromParametersName} or {@code
* KeysetHandle.generateEntryFromParameters}.
*
*
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:
*
*
* Config.register(DeterministicAeadConfig.TINK_1_1_0);
* KeysetHandle handle = KeysetHandle.generateNew(DeterministicAeadKeyTemplates.AES256_SIV);
* DeterministicAead daead = handle.getPrimitive(DeterministicAead.class);
*
*
* @since 1.1.0
* @deprecated Use {@link PredefinedDeterministicAeadParameters} instead.
*/
@Deprecated
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();
}
private DeterministicAeadKeyTemplates() {}
}