| /* |
| * Copyright (C) 2016 The Android Open Source Project |
| * |
| * 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 android.net.wifi.aware; |
| |
| import android.content.Context; |
| import android.content.pm.PackageManager; |
| import android.hardware.wifi.V1_0.Constants; |
| |
| /** |
| * Provides utilities for the Wifi Aware manager/service. |
| * |
| * @hide |
| */ |
| public class WifiAwareUtils { |
| /** |
| * Per spec: The Service Name is a UTF-8 encoded string from 1 to 255 bytes in length. The |
| * only acceptable single-byte UTF-8 symbols for a Service Name are alphanumeric values (A-Z, |
| * a-z, 0-9), the hyphen ('-'), and the period ('.'). All valid multi-byte UTF-8 characters |
| * are acceptable in a Service Name. |
| */ |
| public static void validateServiceName(byte[] serviceNameData) throws IllegalArgumentException { |
| if (serviceNameData == null) { |
| throw new IllegalArgumentException("Invalid service name - null"); |
| } |
| |
| if (serviceNameData.length < 1 || serviceNameData.length > 255) { |
| throw new IllegalArgumentException("Invalid service name length - must be between " |
| + "1 and 255 bytes (UTF-8 encoding)"); |
| } |
| |
| int index = 0; |
| while (index < serviceNameData.length) { |
| byte b = serviceNameData[index]; |
| if ((b & 0x80) == 0x00) { |
| if (!((b >= '0' && b <= '9') || (b >= 'a' && b <= 'z') || (b >= 'A' && b <= 'Z') |
| || b == '-' || b == '.')) { |
| throw new IllegalArgumentException("Invalid service name - illegal characters," |
| + " allowed = (0-9, a-z,A-Z, -, .)"); |
| } |
| } |
| ++index; |
| } |
| } |
| |
| /** |
| * Validates that the passphrase is a non-null string of the right size (per the HAL min/max |
| * length parameters). |
| * |
| * @param passphrase Passphrase to test |
| * @return true if passphrase is valid, false if not |
| */ |
| public static boolean validatePassphrase(String passphrase) { |
| if (passphrase == null |
| || passphrase.length() < Constants.NanParamSizeLimits.MIN_PASSPHRASE_LENGTH |
| || passphrase.length() > Constants.NanParamSizeLimits.MAX_PASSPHRASE_LENGTH) { |
| return false; |
| } |
| |
| return true; |
| } |
| |
| /** |
| * Validates that the PMK is a non-null byte array of the right size (32 bytes per spec). |
| * |
| * @param pmk PMK to test |
| * @return true if PMK is valid, false if not |
| */ |
| public static boolean validatePmk(byte[] pmk) { |
| if (pmk == null || pmk.length != 32) { |
| return false; |
| } |
| |
| return true; |
| } |
| |
| /** |
| * Returns true if the App version is older than minVersion. |
| */ |
| public static boolean isLegacyVersion(Context context, int minVersion) { |
| try { |
| if (context.getPackageManager().getApplicationInfo(context.getOpPackageName(), 0) |
| .targetSdkVersion < minVersion) { |
| return true; |
| } |
| } catch (PackageManager.NameNotFoundException e) { |
| // In case of exception, assume known app (more strict checking) |
| // Note: This case will never happen since checkPackage is |
| // called to verify valididity before checking App's version. |
| } |
| return false; |
| } |
| } |