Merge "Use a 16 byte random suffix for installed apk directory name"

import android.text.format.DateUtils;

import android.util.ArrayMap;

import android.util.ArraySet;

import android.util.Base64;

import android.util.DisplayMetrics;

import android.util.EventLog;

import android.util.ExceptionUtils;

import java.security.MessageDigest;

import java.security.NoSuchAlgorithmException;

import java.security.PublicKey;

import java.security.SecureRandom;

import java.security.cert.Certificate;

import java.security.cert.CertificateEncodingException;

import java.security.cert.CertificateException;

 *

 * <pre>

 * $ runtest -c android.content.pm.PackageManagerTests frameworks-core

 * $ cts-tradefed run commandAndExit cts -m AppSecurityTests

 * $ cts-tradefed run commandAndExit cts -m CtsAppSecurityHostTestCases

 * </pre>

 */

public class PackageManagerService extends IPackageManager.Stub {

    }

    private File getNextCodePath(File targetDir, String packageName) {

        int suffix = 1;

        File result;

        SecureRandom random = new SecureRandom();

        byte[] bytes = new byte[16];

        do {

            random.nextBytes(bytes);

            String suffix = Base64.encodeToString(bytes, Base64.URL_SAFE | Base64.NO_WRAP);

            result = new File(targetDir, packageName + "-" + suffix);

            suffix++;

        } while (result.exists());

        return result;

    }