121 lines
4.2 KiB
Java
121 lines
4.2 KiB
Java
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.net.wifi.aware;
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import android.content.Context;
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import android.content.pm.PackageManager;
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import android.hardware.wifi.V1_0.Constants;
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/**
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* Provides utilities for the Wifi Aware manager/service.
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*
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* @hide
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*/
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public class WifiAwareUtils {
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/**
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* Per spec: The Service Name is a UTF-8 encoded string from 1 to 255 bytes in length. The
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* only acceptable single-byte UTF-8 symbols for a Service Name are alphanumeric values (A-Z,
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* a-z, 0-9), the hyphen ('-'), the underscore ('_') and the period ('.'). All valid multi-byte
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* UTF-8 characters are acceptable in a Service Name.
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*/
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public static void validateServiceName(byte[] serviceNameData) throws IllegalArgumentException {
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if (serviceNameData == null) {
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throw new IllegalArgumentException("Invalid service name - null");
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}
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if (serviceNameData.length < 1 || serviceNameData.length > 255) {
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throw new IllegalArgumentException("Invalid service name length - must be between "
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+ "1 and 255 bytes (UTF-8 encoding)");
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}
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int index = 0;
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while (index < serviceNameData.length) {
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byte b = serviceNameData[index];
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if ((b & 0x80) == 0x00) {
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if (!((b >= '0' && b <= '9') || (b >= 'a' && b <= 'z') || (b >= 'A' && b <= 'Z')
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|| b == '-' || b == '.' || b == '_')) {
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throw new IllegalArgumentException("Invalid service name - illegal characters,"
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+ " allowed = (0-9, a-z,A-Z, -, _, .)");
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}
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}
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++index;
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}
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}
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/**
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* Validates that the passphrase is a non-null string of the right size (per the HAL min/max
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* length parameters).
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*
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* @param passphrase Passphrase to test
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* @return true if passphrase is valid, false if not
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*/
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public static boolean validatePassphrase(String passphrase) {
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if (passphrase == null
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|| passphrase.length() < Constants.NanParamSizeLimits.MIN_PASSPHRASE_LENGTH
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|| passphrase.length() > Constants.NanParamSizeLimits.MAX_PASSPHRASE_LENGTH) {
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return false;
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}
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return true;
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}
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/**
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* Validates that the PMK is a non-null byte array of the right size (32 bytes per spec).
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*
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* @param pmk PMK to test
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* @return true if PMK is valid, false if not
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*/
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public static boolean validatePmk(byte[] pmk) {
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if (pmk == null || pmk.length != 32) {
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return false;
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}
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return true;
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}
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/**
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* Returns true if the App version is older than minVersion.
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*/
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public static boolean isLegacyVersion(Context context, int minVersion) {
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try {
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if (context.getPackageManager().getApplicationInfo(context.getOpPackageName(), 0)
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.targetSdkVersion < minVersion) {
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return true;
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}
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} catch (PackageManager.NameNotFoundException e) {
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// In case of exception, assume known app (more strict checking)
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// Note: This case will never happen since checkPackage is
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// called to verify valididity before checking App's version.
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}
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return false;
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}
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/**
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* Validates that the PMKID is a non-null byte array of the right size (16 bytes per spec).
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*
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* @param pmkId PMK to test
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* @return true if PMK is valid, false if not
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*/
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public static boolean validatePmkId(byte[] pmkId) {
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if (pmkId == null || pmkId.length != 16) {
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return false;
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}
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return true;
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}
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}
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