1 files changed, 103 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/api/signature/CryptoManager.java b/src/main/java/org/traccar/api/signature/CryptoManager.java
new file mode 100644
index 000000000..71f56e0fb
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+++ b/src/main/java/org/traccar/api/signature/CryptoManager.java
@@ -0,0 +1,103 @@
+/*
+ * 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 jakarta.inject.Inject;
+import jakarta.inject.Singleton;
+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;
+
+@Singleton
+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")));
+        }
+    }
+
+}