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/*
* Copyright 2022 Anton Tananaev (anton@traccar.org)
*
* 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 org.traccar.api.signature;
import org.traccar.storage.Storage;
import org.traccar.storage.StorageException;
import org.traccar.storage.query.Columns;
import org.traccar.storage.query.Request;
import javax.inject.Inject;
import java.security.GeneralSecurityException;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.Signature;
import java.security.spec.ECGenParameterSpec;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
public class CryptoManager {
private final Storage storage;
private PublicKey publicKey;
private PrivateKey privateKey;
@Inject
public CryptoManager(Storage storage) {
this.storage = storage;
}
public byte[] sign(byte[] data) throws GeneralSecurityException, StorageException {
if (privateKey == null) {
initializeKeys();
}
Signature signature = Signature.getInstance("SHA256withECDSA");
signature.initSign(privateKey);
signature.update(data);
byte[] block = signature.sign();
byte[] combined = new byte[1 + block.length + data.length];
combined[0] = (byte) block.length;
System.arraycopy(block, 0, combined, 1, block.length);
System.arraycopy(data, 0, combined, 1 + block.length, data.length);
return combined;
}
public byte[] verify(byte[] data) throws GeneralSecurityException, StorageException {
if (publicKey == null) {
initializeKeys();
}
Signature signature = Signature.getInstance("SHA256withECDSA");
signature.initVerify(publicKey);
int length = data[0];
byte[] originalData = new byte[data.length - 1 - length];
System.arraycopy(data, 1 + length, originalData, 0, originalData.length);
signature.update(originalData);
if (!signature.verify(data, 1, length)) {
throw new SecurityException("Invalid signature");
}
return originalData;
}
private void initializeKeys() throws StorageException, GeneralSecurityException {
KeystoreModel model = storage.getObject(KeystoreModel.class, new Request(new Columns.All()));
if (model != null) {
publicKey = KeyFactory.getInstance("EC")
.generatePublic(new X509EncodedKeySpec(model.getPublicKey()));
privateKey = KeyFactory.getInstance("EC")
.generatePrivate(new PKCS8EncodedKeySpec(model.getPrivateKey()));
} else {
KeyPairGenerator generator = KeyPairGenerator.getInstance("EC");
generator.initialize(new ECGenParameterSpec("secp256r1"), new SecureRandom());
KeyPair pair = generator.generateKeyPair();
publicKey = pair.getPublic();
privateKey = pair.getPrivate();
model = new KeystoreModel();
model.setPublicKey(publicKey.getEncoded());
model.setPrivateKey(privateKey.getEncoded());
storage.addObject(model, new Request(new Columns.Exclude("id")));
}
}
}
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