| // 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.aead; |
| |
| import com.google.crypto.tink.Aead; |
| import com.google.crypto.tink.KeyTypeManager; |
| import com.google.crypto.tink.KmsClient; |
| import com.google.crypto.tink.KmsClients; |
| import com.google.crypto.tink.proto.KeyData.KeyMaterialType; |
| import com.google.crypto.tink.proto.KmsAeadKey; |
| import com.google.crypto.tink.proto.KmsAeadKeyFormat; |
| import com.google.crypto.tink.subtle.Validators; |
| import com.google.protobuf.ByteString; |
| import com.google.protobuf.InvalidProtocolBufferException; |
| import java.security.GeneralSecurityException; |
| |
| /** |
| * This key manager produces new instances of {@code Aead} that forwards encrypt/decrypt requests to |
| * a key residing in a remote KMS. |
| */ |
| class KmsAeadKeyManager extends KeyTypeManager<KmsAeadKey> { |
| public KmsAeadKeyManager() { |
| super( |
| KmsAeadKey.class, |
| new PrimitiveFactory<Aead, KmsAeadKey>(Aead.class) { |
| @Override |
| public Aead getPrimitive(KmsAeadKey keyProto) throws GeneralSecurityException { |
| String keyUri = keyProto.getParams().getKeyUri(); |
| KmsClient kmsClient = KmsClients.get(keyUri); |
| return kmsClient.getAead(keyUri); |
| } |
| }); |
| } |
| |
| @Override |
| public String getKeyType() { |
| return "type.googleapis.com/google.crypto.tink.KmsAeadKey"; |
| } |
| |
| @Override |
| public int getVersion() { |
| return 0; |
| } |
| |
| @Override |
| public KeyMaterialType keyMaterialType() { |
| return KeyMaterialType.REMOTE; |
| } |
| |
| @Override |
| public void validateKey(KmsAeadKey key) throws GeneralSecurityException { |
| Validators.validateVersion(key.getVersion(), getVersion()); |
| } |
| |
| @Override |
| public KmsAeadKey parseKey(ByteString byteString) throws InvalidProtocolBufferException { |
| return KmsAeadKey.parseFrom(byteString); |
| } |
| |
| @Override |
| public KeyFactory<KmsAeadKeyFormat, KmsAeadKey> keyFactory() { |
| return new KeyFactory<KmsAeadKeyFormat, KmsAeadKey>(KmsAeadKeyFormat.class) { |
| @Override |
| public void validateKeyFormat(KmsAeadKeyFormat format) throws GeneralSecurityException {} |
| |
| @Override |
| public KmsAeadKeyFormat parseKeyFormat(ByteString byteString) |
| throws InvalidProtocolBufferException { |
| return KmsAeadKeyFormat.parseFrom(byteString); |
| } |
| |
| @Override |
| public KmsAeadKey createKey(KmsAeadKeyFormat format) throws GeneralSecurityException { |
| return KmsAeadKey.newBuilder().setParams(format).setVersion(getVersion()).build(); |
| } |
| }; |
| } |
| } |