| // Copyright 2020 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.tinkkey.internal; |
| |
| import com.google.crypto.tink.KeyTemplate; |
| import com.google.crypto.tink.KeyTemplate.OutputPrefixType; |
| import com.google.crypto.tink.proto.KeyData; |
| import com.google.crypto.tink.tinkkey.TinkKey; |
| import com.google.errorprone.annotations.Immutable; |
| |
| /** |
| * Wraps the proto {@code KeyData} as an implementation of a {@code TinkKey}. The underlying {@code |
| * KeyData} determines whether this ProtoKey has a secret. |
| * |
| * <p>ProtoKey is not intended for use outside of the Tink project. |
| */ |
| @Immutable |
| public final class ProtoKey implements TinkKey { |
| private final KeyData keyData; |
| private final boolean hasSecret; |
| private final OutputPrefixType outputPrefixType; |
| |
| /** |
| * Constructs a ProtoKey with {@code hasSecret()} returning true if the input {@code KeyData} has |
| * key material of type UNKNOWN_KEYMATERIAL, SYMMETRIC, or ASYMMETRIC_PRIVATE. |
| */ |
| public ProtoKey(KeyData keyData, OutputPrefixType opt) { |
| this.hasSecret = isSecret(keyData); |
| this.keyData = keyData; |
| this.outputPrefixType = opt; |
| } |
| |
| private static boolean isSecret(KeyData keyData) { |
| return keyData.getKeyMaterialType() == KeyData.KeyMaterialType.UNKNOWN_KEYMATERIAL |
| || keyData.getKeyMaterialType() == KeyData.KeyMaterialType.SYMMETRIC |
| || keyData.getKeyMaterialType() == KeyData.KeyMaterialType.ASYMMETRIC_PRIVATE; |
| } |
| |
| public KeyData getProtoKey() { |
| return keyData; |
| } |
| |
| public OutputPrefixType getOutputPrefixType() { |
| return outputPrefixType; |
| } |
| |
| @Override |
| public boolean hasSecret() { |
| return hasSecret; |
| } |
| |
| /** |
| * @throws UnsupportedOperationException There is currently no direct way of getting a {@code |
| * KeyTemplate} from {@code KeyData}. |
| */ |
| @Override |
| public KeyTemplate getKeyTemplate() { |
| throw new UnsupportedOperationException(); |
| } |
| } |