| /** |
| * 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; |
| |
| import android.os.Parcel; |
| |
| import java.io.ByteArrayInputStream; |
| import java.security.KeyFactory; |
| import java.security.NoSuchAlgorithmException; |
| import java.security.PrivateKey; |
| import java.security.cert.CertificateEncodingException; |
| import java.security.cert.CertificateException; |
| import java.security.cert.CertificateFactory; |
| import java.security.cert.X509Certificate; |
| import java.security.spec.InvalidKeySpecException; |
| import java.security.spec.PKCS8EncodedKeySpec; |
| |
| /** |
| * Provides utilities for writing/reading a non-Parcelable objects to/from |
| * a Parcel object. |
| * |
| * @hide |
| */ |
| public class ParcelUtil { |
| /** |
| * Write a PrivateKey object |key| to the specified Parcel |dest|. |
| * |
| * Below is the data format: |
| * |algorithm| -> String of algorithm name |
| * |endcodedKey| -> byte[] of key data |
| * |
| * For a null PrivateKey object, a null string will be written to |algorithm| and |
| * |encodedKey| will be skipped. Since a PrivateKey can only be constructed with |
| * a valid algorithm String. |
| * |
| * @param dest Parcel object to write to |
| * @param key PrivateKey object to read from. |
| */ |
| public static void writePrivateKey(Parcel dest, PrivateKey key) { |
| if (key == null) { |
| dest.writeString(null); |
| return; |
| } |
| |
| dest.writeString(key.getAlgorithm()); |
| dest.writeByteArray(key.getEncoded()); |
| } |
| |
| /** |
| * Read/create a PrivateKey object from a specified Parcel object |in|. |
| * |
| * Refer to the function above for the expected data format. |
| * |
| * @param in Parcel object to read from |
| * @return a PrivateKey object or null |
| */ |
| public static PrivateKey readPrivateKey(Parcel in) { |
| String algorithm = in.readString(); |
| if (algorithm == null) { |
| return null; |
| } |
| |
| byte[] userKeyBytes = in.createByteArray(); |
| try { |
| KeyFactory keyFactory = KeyFactory.getInstance(algorithm); |
| return keyFactory.generatePrivate(new PKCS8EncodedKeySpec(userKeyBytes)); |
| } catch (NoSuchAlgorithmException | InvalidKeySpecException e) { |
| return null; |
| } |
| } |
| |
| /** |
| * Write a X509Certificate object |cert| to a Parcel object |dest|. |
| * The data being written to the Parcel is just a byte[] of the encoded certificate data. |
| * |
| * @param dest Parcel object to write to |
| * @param cert X509Certificate object to read from |
| */ |
| public static void writeCertificate(Parcel dest, X509Certificate cert) { |
| byte[] certBytes = null; |
| if (cert != null) { |
| try { |
| certBytes = cert.getEncoded(); |
| } catch (CertificateEncodingException e) { |
| /* empty, write null. */ |
| } |
| } |
| dest.writeByteArray(certBytes); |
| } |
| |
| /** |
| * Read/create a X509Certificate object from a specified Parcel object |in|. |
| * |
| * @param in Parcel object to read from |
| * @return a X509Certficate object or null |
| */ |
| public static X509Certificate readCertificate(Parcel in) { |
| byte[] certBytes = in.createByteArray(); |
| if (certBytes == null) { |
| return null; |
| } |
| |
| try { |
| CertificateFactory cFactory = CertificateFactory.getInstance("X.509"); |
| return (X509Certificate) cFactory |
| .generateCertificate(new ByteArrayInputStream(certBytes)); |
| } catch (CertificateException e) { |
| return null; |
| } |
| } |
| |
| /** |
| * Write an array of X509Certificate objects |certs| to a Parcel object |dest|. |
| * The data being written to the Parcel are consist of an integer indicating |
| * the size of the array and the certificates data. Certificates data will be |
| * skipped for a null array or size of 0 array. |
| * |
| * @param dest Parcel object to write to |
| * @param certs array of X509Certificate objects to read from |
| */ |
| public static void writeCertificates(Parcel dest, X509Certificate[] certs) { |
| if (certs == null || certs.length == 0) { |
| dest.writeInt(0); |
| return; |
| } |
| |
| dest.writeInt(certs.length); |
| for (int i = 0; i < certs.length; i++) { |
| writeCertificate(dest, certs[i]); |
| } |
| } |
| |
| /** |
| * Read/create an array of X509Certificate objects from a specified Parcel object |in|. |
| * |
| * @param in Parcel object to read from |
| * @return X509Certficate[] or null |
| */ |
| public static X509Certificate[] readCertificates(Parcel in) { |
| int length = in.readInt(); |
| if (length == 0) { |
| return null; |
| } |
| |
| X509Certificate[] certs = new X509Certificate[length]; |
| for (int i = 0; i < length; i++) { |
| certs[i] = readCertificate(in); |
| } |
| return certs; |
| } |
| } |