implemented EncryptedKeyStore

for this to work, the KeyStorage interface had to be extended

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

de.srsoftware.oidc.datastore.encrypted/src/test/java/EncryptedKeyStoreTest.java

@@ -0,0 +1,53 @@
+/* © SRSoftware 2024 */
+import static de.srsoftware.utils.Strings.uuid;
+
+import de.srsoftware.oidc.api.KeyStorage;
+import de.srsoftware.oidc.api.KeyStoreTest;
+import de.srsoftware.oidc.datastore.encrypted.EncryptedKeyStore;
+import java.io.IOException;
+import java.sql.SQLException;
+import java.util.HashMap;
+import java.util.List;
+import org.junit.jupiter.api.BeforeEach;
+
+
+public class EncryptedKeyStoreTest extends KeyStoreTest {
+	private class InMemoryKeyStore implements KeyStorage {
+		private HashMap<String, String> store = new HashMap<>();
+		@Override
+		public KeyStorage drop(String keyId) {
+			store.remove(keyId);
+			return this;
+		}
+
+		@Override
+		public List<String> listKeys() {
+			return List.copyOf(store.keySet());
+		}
+
+		@Override
+		public String loadJson(String keyId) {
+			return store.get(keyId);
+		}
+
+		@Override
+		public KeyStorage store(String keyId, String jsonWebKey) throws IOException {
+			store.put(keyId, jsonWebKey);
+			return this;
+		}
+	}
+	private KeyStorage keyStore;
+
+	@Override
+	protected KeyStorage keyStore() {
+		return keyStore;
+	}
+
+	@BeforeEach
+	public void setup() throws SQLException {
+		var backend = new InMemoryKeyStore();
+		var key     = uuid();
+		var salt    = uuid();
+		keyStore    = new EncryptedKeyStore(key, salt, backend);
+	}
+}