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Tink is a small cryptographic library that provides a safe, simple, agile and fast way to accomplish some common cryptographic tasks.
// 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.hybrid;
import com.google.crypto.tink.HybridEncrypt;
import com.google.crypto.tink.internal.KeyTypeManager;
import com.google.crypto.tink.internal.PrimitiveFactory;
import com.google.crypto.tink.proto.EciesAeadHkdfParams;
import com.google.crypto.tink.proto.EciesAeadHkdfPublicKey;
import com.google.crypto.tink.proto.EciesHkdfKemParams;
import com.google.crypto.tink.proto.KeyData.KeyMaterialType;
import com.google.crypto.tink.subtle.EciesAeadHkdfDemHelper;
import com.google.crypto.tink.subtle.EciesAeadHkdfHybridEncrypt;
import com.google.crypto.tink.subtle.EllipticCurves;
import com.google.crypto.tink.subtle.Validators;
import com.google.protobuf.ByteString;
import com.google.protobuf.ExtensionRegistryLite;
import com.google.protobuf.InvalidProtocolBufferException;
import java.security.GeneralSecurityException;
import java.security.interfaces.ECPublicKey;
/**
* This key manager produces new instances of {@code EciesAeadHkdfHybridEncrypt}. It doesn't support
* key generation.
*/
class EciesAeadHkdfPublicKeyManager extends KeyTypeManager {
public EciesAeadHkdfPublicKeyManager() {
super(
EciesAeadHkdfPublicKey.class,
new PrimitiveFactory(HybridEncrypt.class) {
@Override
public HybridEncrypt getPrimitive(EciesAeadHkdfPublicKey recipientKeyProto)
throws GeneralSecurityException {
EciesAeadHkdfParams eciesParams = recipientKeyProto.getParams();
EciesHkdfKemParams kemParams = eciesParams.getKemParams();
ECPublicKey recipientPublicKey =
EllipticCurves.getEcPublicKey(
HybridUtil.toCurveType(kemParams.getCurveType()),
recipientKeyProto.getX().toByteArray(),
recipientKeyProto.getY().toByteArray());
EciesAeadHkdfDemHelper demHelper =
new RegistryEciesAeadHkdfDemHelper(eciesParams.getDemParams().getAeadDem());
return new EciesAeadHkdfHybridEncrypt(
recipientPublicKey,
kemParams.getHkdfSalt().toByteArray(),
HybridUtil.toHmacAlgo(kemParams.getHkdfHashType()),
HybridUtil.toPointFormatType(eciesParams.getEcPointFormat()),
demHelper);
}
});
}
@Override
public String getKeyType() {
return "type.googleapis.com/google.crypto.tink.EciesAeadHkdfPublicKey";
}
@Override
public int getVersion() {
return 0;
}
@Override
public KeyMaterialType keyMaterialType() {
return KeyMaterialType.ASYMMETRIC_PUBLIC;
}
@Override
public EciesAeadHkdfPublicKey parseKey(ByteString byteString)
throws InvalidProtocolBufferException {
return EciesAeadHkdfPublicKey.parseFrom(byteString, ExtensionRegistryLite.getEmptyRegistry());
}
@Override
public void validateKey(EciesAeadHkdfPublicKey key) throws GeneralSecurityException {
// TODO(b/74251423): add more checks.
Validators.validateVersion(key.getVersion(), getVersion());
HybridUtil.validate(key.getParams());
}
}
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