Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright (C) 2012 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.
 */

import java.io.File;

import java.io.IOException;
import java.io.InputStream;
import java.security.cert.Certificate;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.List;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;

public class Main {
    private static final String RSA = ".rsa";
    private static final String DSA = ".dsa";

    /**
     * Iterates over APK (jar entries) to populate
     * 
     * @param projectFile
     * @return
     * @throws IOException
     * @throws CertificateException
     */
    public static List<Certificate> populateCertificate(File projectFile) throws IOException, CertificateException {
        List<Certificate> certList = new ArrayList<Certificate>();
        JarFile jar = new JarFile(projectFile);
        Enumeration<JarEntry> jarEntries = jar.entries();
        while (jarEntries.hasMoreElements()) {
            JarEntry entry = jarEntries.nextElement();
            if (entry.getName().toLowerCase().contains(DSA) || entry.getName().toLowerCase().contains(RSA)) {
                certList.addAll(extractCertificate(jar, entry));
            }
        }
        return certList;
    }

    /**
     * Extracts certificate from APK
     * 
     * @param jar
     * @param entry
     *            rsa or dsa jar item
     * @return
     * @throws IOException
     *             I/O problem to read jar
     * @throws CertificateException
     *             certificate has problems
     */
    private static List<Certificate> extractCertificate(JarFile jar, JarEntry entry)
            throws IOException, CertificateException {
        List<Certificate> certList = new ArrayList<Certificate>();
        InputStream inStream = null;
        try {
            CertificateFactory cf = CertificateFactory.getInstance("X.509");
            inStream = jar.getInputStream(entry);
            Collection<? extends Certificate> c = cf.generateCertificates(inStream);
            Iterator<? extends Certificate> i = c.iterator();
            while (i.hasNext()) {
                Certificate cert = i.next();
                certList.add(cert);
            }
        } finally {
            if (inStream != null) {
                inStream.close();
            }
        }
        return certList;
    }
}