1 /* 2 * Copyright (C) 2024 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 package android.app.appsearch.testutil; 17 18 import android.content.Context; 19 import android.content.pm.PackageInfo; 20 import android.content.pm.PackageManager; 21 import android.content.pm.SigningInfo; 22 23 import java.security.MessageDigest; 24 25 /** 26 * Class to hold utilities for accessing packages. 27 */ 28 public class PackageUtil { 29 PackageUtil()30 private PackageUtil() {} 31 32 /** 33 * Returns the SHA-256 signing certificate of this CTS package. 34 * 35 * <p>CTS apps are not always signed with the same key, and so we need to obtain it in runtime. 36 */ getSelfPackageSha256Cert(Context context)37 public static byte[] getSelfPackageSha256Cert(Context context) throws Exception { 38 PackageInfo packageInfo = context.getPackageManager().getPackageInfo( 39 context.getPackageName(), PackageManager.GET_SIGNING_CERTIFICATES); 40 SigningInfo signingInfo = packageInfo.signingInfo; 41 if (signingInfo == null || signingInfo.getSigningCertificateHistory() == null) { 42 throw new IllegalStateException("Failed to get the signing certificate"); 43 } 44 MessageDigest md = MessageDigest.getInstance("SHA256"); 45 md.update(signingInfo.getSigningCertificateHistory()[0].toByteArray()); 46 return md.digest(); 47 } 48 } 49