com.google.crypto.tink.prf.internal.LegacyFullPrf Maven / Gradle / Ivy
// Copyright 2023 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.prf.internal;
import com.google.crypto.tink.InsecureSecretKeyAccess;
import com.google.crypto.tink.Registry;
import com.google.crypto.tink.internal.LegacyProtoKey;
import com.google.crypto.tink.internal.ProtoKeySerialization;
import com.google.crypto.tink.prf.Prf;
import com.google.crypto.tink.proto.KeyData;
import com.google.errorprone.annotations.Immutable;
import java.security.GeneralSecurityException;
/**
* Takes an arbitrary raw Prf and makes it a full primitive. ("Full" doesn't make much difference
* in case of PRFs but we keep the name for consistency with the other primitives.)
* This is a class that helps us transition onto the new Keys and Configurations interface,
* by bringing potential user-defined primitives to a common denominator with our primitives over
* which we have control.
*/
@Immutable
public class LegacyFullPrf implements Prf {
private final Prf rawPrf;
/** This method covers the cases where users created their own prf/key classes. */
public static Prf create(LegacyProtoKey key) throws GeneralSecurityException {
ProtoKeySerialization protoKeySerialization =
key.getSerialization(InsecureSecretKeyAccess.get());
KeyData keyData =
KeyData.newBuilder()
.setTypeUrl(protoKeySerialization.getTypeUrl())
.setValue(protoKeySerialization.getValue())
.setKeyMaterialType(protoKeySerialization.getKeyMaterialType())
.build();
return new LegacyFullPrf(Registry.getPrimitive(keyData, Prf.class));
}
private LegacyFullPrf(Prf rawPrf) {
this.rawPrf = rawPrf;
}
@Override
public byte[] compute(byte[] input, int outputLength) throws GeneralSecurityException {
return rawPrf.compute(input, outputLength);
}
}