2009-03-04 11:28:42 +08:00
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/*
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* Copyright (C) 2008 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 com.android.signapk;
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import sun.misc.BASE64Encoder;
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import sun.security.pkcs.ContentInfo;
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import sun.security.pkcs.PKCS7;
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import sun.security.pkcs.SignerInfo;
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import sun.security.x509.AlgorithmId;
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import sun.security.x509.X500Name;
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import java.io.BufferedReader;
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import java.io.ByteArrayOutputStream;
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import java.io.DataInputStream;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileOutputStream;
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import java.io.FilterOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.io.OutputStream;
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import java.io.PrintStream;
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import java.security.AlgorithmParameters;
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import java.security.DigestOutputStream;
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import java.security.GeneralSecurityException;
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import java.security.Key;
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import java.security.KeyFactory;
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import java.security.MessageDigest;
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import java.security.PrivateKey;
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import java.security.Signature;
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import java.security.SignatureException;
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import java.security.cert.Certificate;
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import java.security.cert.CertificateFactory;
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import java.security.cert.X509Certificate;
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import java.security.spec.InvalidKeySpecException;
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import java.security.spec.KeySpec;
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import java.security.spec.PKCS8EncodedKeySpec;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.Date;
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import java.util.Enumeration;
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import java.util.List;
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import java.util.Map;
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import java.util.TreeMap;
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import java.util.jar.Attributes;
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import java.util.jar.JarEntry;
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import java.util.jar.JarFile;
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import java.util.jar.JarOutputStream;
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import java.util.jar.Manifest;
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2009-06-09 01:46:55 +08:00
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import java.util.regex.Pattern;
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2009-03-04 11:28:42 +08:00
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import javax.crypto.Cipher;
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import javax.crypto.EncryptedPrivateKeyInfo;
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import javax.crypto.SecretKeyFactory;
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import javax.crypto.spec.PBEKeySpec;
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/**
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* Command line tool to sign JAR files (including APKs and OTA updates) in
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* a way compatible with the mincrypt verifier, using SHA1 and RSA keys.
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*/
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class SignApk {
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private static final String CERT_SF_NAME = "META-INF/CERT.SF";
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private static final String CERT_RSA_NAME = "META-INF/CERT.RSA";
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2012-05-12 00:20:50 +08:00
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private static final String OTACERT_NAME = "META-INF/com/android/otacert";
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2009-06-09 01:46:55 +08:00
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// Files matching this pattern are not copied to the output.
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private static Pattern stripPattern =
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Pattern.compile("^META-INF/(.*)[.](SF|RSA|DSA)$");
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2009-03-04 11:28:42 +08:00
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private static X509Certificate readPublicKey(File file)
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throws IOException, GeneralSecurityException {
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FileInputStream input = new FileInputStream(file);
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try {
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CertificateFactory cf = CertificateFactory.getInstance("X.509");
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return (X509Certificate) cf.generateCertificate(input);
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} finally {
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input.close();
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}
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}
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/**
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* Reads the password from stdin and returns it as a string.
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*
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* @param keyFile The file containing the private key. Used to prompt the user.
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*/
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private static String readPassword(File keyFile) {
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// TODO: use Console.readPassword() when it's available.
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System.out.print("Enter password for " + keyFile + " (password will not be hidden): ");
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System.out.flush();
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BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
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try {
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return stdin.readLine();
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} catch (IOException ex) {
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return null;
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}
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}
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/**
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* Decrypt an encrypted PKCS 8 format private key.
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*
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* Based on ghstark's post on Aug 6, 2006 at
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* http://forums.sun.com/thread.jspa?threadID=758133&messageID=4330949
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*
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* @param encryptedPrivateKey The raw data of the private key
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* @param keyFile The file containing the private key
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*/
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private static KeySpec decryptPrivateKey(byte[] encryptedPrivateKey, File keyFile)
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throws GeneralSecurityException {
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EncryptedPrivateKeyInfo epkInfo;
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try {
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epkInfo = new EncryptedPrivateKeyInfo(encryptedPrivateKey);
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} catch (IOException ex) {
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// Probably not an encrypted key.
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return null;
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}
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char[] password = readPassword(keyFile).toCharArray();
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SecretKeyFactory skFactory = SecretKeyFactory.getInstance(epkInfo.getAlgName());
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Key key = skFactory.generateSecret(new PBEKeySpec(password));
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Cipher cipher = Cipher.getInstance(epkInfo.getAlgName());
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cipher.init(Cipher.DECRYPT_MODE, key, epkInfo.getAlgParameters());
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try {
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return epkInfo.getKeySpec(cipher);
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} catch (InvalidKeySpecException ex) {
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System.err.println("signapk: Password for " + keyFile + " may be bad.");
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throw ex;
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}
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}
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/** Read a PKCS 8 format private key. */
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private static PrivateKey readPrivateKey(File file)
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throws IOException, GeneralSecurityException {
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DataInputStream input = new DataInputStream(new FileInputStream(file));
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try {
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byte[] bytes = new byte[(int) file.length()];
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input.read(bytes);
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KeySpec spec = decryptPrivateKey(bytes, file);
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if (spec == null) {
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spec = new PKCS8EncodedKeySpec(bytes);
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}
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try {
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return KeyFactory.getInstance("RSA").generatePrivate(spec);
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} catch (InvalidKeySpecException ex) {
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return KeyFactory.getInstance("DSA").generatePrivate(spec);
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}
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} finally {
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input.close();
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}
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}
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/** Add the SHA1 of every file to the manifest, creating it if necessary. */
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private static Manifest addDigestsToManifest(JarFile jar)
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throws IOException, GeneralSecurityException {
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Manifest input = jar.getManifest();
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Manifest output = new Manifest();
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Attributes main = output.getMainAttributes();
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if (input != null) {
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main.putAll(input.getMainAttributes());
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} else {
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main.putValue("Manifest-Version", "1.0");
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main.putValue("Created-By", "1.0 (Android SignApk)");
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}
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BASE64Encoder base64 = new BASE64Encoder();
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MessageDigest md = MessageDigest.getInstance("SHA1");
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byte[] buffer = new byte[4096];
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int num;
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// We sort the input entries by name, and add them to the
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// output manifest in sorted order. We expect that the output
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// map will be deterministic.
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TreeMap<String, JarEntry> byName = new TreeMap<String, JarEntry>();
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for (Enumeration<JarEntry> e = jar.entries(); e.hasMoreElements(); ) {
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JarEntry entry = e.nextElement();
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byName.put(entry.getName(), entry);
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}
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for (JarEntry entry: byName.values()) {
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String name = entry.getName();
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if (!entry.isDirectory() && !name.equals(JarFile.MANIFEST_NAME) &&
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2009-06-09 01:46:55 +08:00
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!name.equals(CERT_SF_NAME) && !name.equals(CERT_RSA_NAME) &&
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2012-05-12 00:20:50 +08:00
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!name.equals(OTACERT_NAME) &&
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2009-06-09 01:46:55 +08:00
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(stripPattern == null ||
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!stripPattern.matcher(name).matches())) {
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2009-03-04 11:28:42 +08:00
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InputStream data = jar.getInputStream(entry);
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while ((num = data.read(buffer)) > 0) {
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md.update(buffer, 0, num);
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}
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Attributes attr = null;
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if (input != null) attr = input.getAttributes(name);
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attr = attr != null ? new Attributes(attr) : new Attributes();
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attr.putValue("SHA1-Digest", base64.encode(md.digest()));
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output.getEntries().put(name, attr);
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}
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}
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return output;
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}
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2012-05-12 00:20:50 +08:00
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/**
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* Add a copy of the public key to the archive; this should
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* exactly match one of the files in
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* /system/etc/security/otacerts.zip on the device. (The same
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* cert can be extracted from the CERT.RSA file but this is much
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* easier to get at.)
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*/
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private static void addOtacert(JarOutputStream outputJar,
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File publicKeyFile,
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long timestamp,
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Manifest manifest)
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throws IOException, GeneralSecurityException {
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BASE64Encoder base64 = new BASE64Encoder();
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MessageDigest md = MessageDigest.getInstance("SHA1");
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JarEntry je = new JarEntry(OTACERT_NAME);
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je.setTime(timestamp);
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outputJar.putNextEntry(je);
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FileInputStream input = new FileInputStream(publicKeyFile);
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byte[] b = new byte[4096];
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int read;
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while ((read = input.read(b)) != -1) {
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outputJar.write(b, 0, read);
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md.update(b, 0, read);
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}
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input.close();
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Attributes attr = new Attributes();
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attr.putValue("SHA1-Digest", base64.encode(md.digest()));
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manifest.getEntries().put(OTACERT_NAME, attr);
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}
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2009-03-04 11:28:42 +08:00
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/** Write to another stream and also feed it to the Signature object. */
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private static class SignatureOutputStream extends FilterOutputStream {
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private Signature mSignature;
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2010-09-24 13:57:05 +08:00
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private int mCount;
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2009-03-04 11:28:42 +08:00
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public SignatureOutputStream(OutputStream out, Signature sig) {
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super(out);
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mSignature = sig;
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2010-09-24 13:57:05 +08:00
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mCount = 0;
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2009-03-04 11:28:42 +08:00
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}
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@Override
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public void write(int b) throws IOException {
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try {
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mSignature.update((byte) b);
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} catch (SignatureException e) {
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throw new IOException("SignatureException: " + e);
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}
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super.write(b);
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2010-09-24 13:57:05 +08:00
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mCount++;
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2009-03-04 11:28:42 +08:00
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}
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@Override
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public void write(byte[] b, int off, int len) throws IOException {
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try {
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mSignature.update(b, off, len);
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} catch (SignatureException e) {
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throw new IOException("SignatureException: " + e);
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}
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super.write(b, off, len);
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2010-09-24 13:57:05 +08:00
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mCount += len;
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}
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public int size() {
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return mCount;
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2009-03-04 11:28:42 +08:00
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}
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}
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2009-08-13 09:20:24 +08:00
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/** Write a .SF file with a digest of the specified manifest. */
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2010-09-24 13:57:05 +08:00
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private static void writeSignatureFile(Manifest manifest, SignatureOutputStream out)
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2009-03-04 11:28:42 +08:00
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throws IOException, GeneralSecurityException {
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Manifest sf = new Manifest();
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Attributes main = sf.getMainAttributes();
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main.putValue("Signature-Version", "1.0");
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main.putValue("Created-By", "1.0 (Android SignApk)");
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BASE64Encoder base64 = new BASE64Encoder();
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MessageDigest md = MessageDigest.getInstance("SHA1");
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PrintStream print = new PrintStream(
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new DigestOutputStream(new ByteArrayOutputStream(), md),
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true, "UTF-8");
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// Digest of the entire manifest
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manifest.write(print);
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print.flush();
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main.putValue("SHA1-Digest-Manifest", base64.encode(md.digest()));
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Map<String, Attributes> entries = manifest.getEntries();
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for (Map.Entry<String, Attributes> entry : entries.entrySet()) {
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// Digest of the manifest stanza for this entry.
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print.print("Name: " + entry.getKey() + "\r\n");
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for (Map.Entry<Object, Object> att : entry.getValue().entrySet()) {
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print.print(att.getKey() + ": " + att.getValue() + "\r\n");
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}
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print.print("\r\n");
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print.flush();
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Attributes sfAttr = new Attributes();
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sfAttr.putValue("SHA1-Digest", base64.encode(md.digest()));
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sf.getEntries().put(entry.getKey(), sfAttr);
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}
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sf.write(out);
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2010-09-24 13:57:05 +08:00
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// A bug in the java.util.jar implementation of Android platforms
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// up to version 1.6 will cause a spurious IOException to be thrown
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// if the length of the signature file is a multiple of 1024 bytes.
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// As a workaround, add an extra CRLF in this case.
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if ((out.size() % 1024) == 0) {
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out.write('\r');
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out.write('\n');
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}
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2009-03-04 11:28:42 +08:00
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}
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/** Write a .RSA file with a digital signature. */
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private static void writeSignatureBlock(
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Signature signature, X509Certificate publicKey, OutputStream out)
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throws IOException, GeneralSecurityException {
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SignerInfo signerInfo = new SignerInfo(
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new X500Name(publicKey.getIssuerX500Principal().getName()),
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publicKey.getSerialNumber(),
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AlgorithmId.get("SHA1"),
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AlgorithmId.get("RSA"),
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signature.sign());
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PKCS7 pkcs7 = new PKCS7(
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new AlgorithmId[] { AlgorithmId.get("SHA1") },
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new ContentInfo(ContentInfo.DATA_OID, null),
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new X509Certificate[] { publicKey },
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new SignerInfo[] { signerInfo });
|
|
|
|
|
|
|
|
pkcs7.encodeSignedData(out);
|
|
|
|
}
|
|
|
|
|
2009-08-13 09:20:24 +08:00
|
|
|
private static void signWholeOutputFile(byte[] zipData,
|
|
|
|
OutputStream outputStream,
|
|
|
|
X509Certificate publicKey,
|
|
|
|
PrivateKey privateKey)
|
|
|
|
throws IOException, GeneralSecurityException {
|
|
|
|
|
|
|
|
// For a zip with no archive comment, the
|
|
|
|
// end-of-central-directory record will be 22 bytes long, so
|
|
|
|
// we expect to find the EOCD marker 22 bytes from the end.
|
|
|
|
if (zipData[zipData.length-22] != 0x50 ||
|
|
|
|
zipData[zipData.length-21] != 0x4b ||
|
|
|
|
zipData[zipData.length-20] != 0x05 ||
|
|
|
|
zipData[zipData.length-19] != 0x06) {
|
|
|
|
throw new IllegalArgumentException("zip data already has an archive comment");
|
|
|
|
}
|
|
|
|
|
|
|
|
Signature signature = Signature.getInstance("SHA1withRSA");
|
|
|
|
signature.initSign(privateKey);
|
|
|
|
signature.update(zipData, 0, zipData.length-2);
|
|
|
|
|
|
|
|
ByteArrayOutputStream temp = new ByteArrayOutputStream();
|
|
|
|
|
|
|
|
// put a readable message and a null char at the start of the
|
|
|
|
// archive comment, so that tools that display the comment
|
|
|
|
// (hopefully) show something sensible.
|
|
|
|
// TODO: anything more useful we can put in this message?
|
|
|
|
byte[] message = "signed by SignApk".getBytes("UTF-8");
|
|
|
|
temp.write(message);
|
|
|
|
temp.write(0);
|
|
|
|
writeSignatureBlock(signature, publicKey, temp);
|
|
|
|
int total_size = temp.size() + 6;
|
|
|
|
if (total_size > 0xffff) {
|
|
|
|
throw new IllegalArgumentException("signature is too big for ZIP file comment");
|
|
|
|
}
|
|
|
|
// signature starts this many bytes from the end of the file
|
|
|
|
int signature_start = total_size - message.length - 1;
|
|
|
|
temp.write(signature_start & 0xff);
|
|
|
|
temp.write((signature_start >> 8) & 0xff);
|
2009-08-15 07:42:35 +08:00
|
|
|
// Why the 0xff bytes? In a zip file with no archive comment,
|
|
|
|
// bytes [-6:-2] of the file are the little-endian offset from
|
|
|
|
// the start of the file to the central directory. So for the
|
|
|
|
// two high bytes to be 0xff 0xff, the archive would have to
|
|
|
|
// be nearly 4GB in side. So it's unlikely that a real
|
|
|
|
// commentless archive would have 0xffs here, and lets us tell
|
|
|
|
// an old signed archive from a new one.
|
|
|
|
temp.write(0xff);
|
|
|
|
temp.write(0xff);
|
2009-08-13 09:20:24 +08:00
|
|
|
temp.write(total_size & 0xff);
|
|
|
|
temp.write((total_size >> 8) & 0xff);
|
|
|
|
temp.flush();
|
|
|
|
|
2009-08-15 07:42:35 +08:00
|
|
|
// Signature verification checks that the EOCD header is the
|
|
|
|
// last such sequence in the file (to avoid minzip finding a
|
|
|
|
// fake EOCD appended after the signature in its scan). The
|
|
|
|
// odds of producing this sequence by chance are very low, but
|
|
|
|
// let's catch it here if it does.
|
|
|
|
byte[] b = temp.toByteArray();
|
|
|
|
for (int i = 0; i < b.length-3; ++i) {
|
|
|
|
if (b[i] == 0x50 && b[i+1] == 0x4b && b[i+2] == 0x05 && b[i+3] == 0x06) {
|
|
|
|
throw new IllegalArgumentException("found spurious EOCD header at " + i);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2009-08-13 09:20:24 +08:00
|
|
|
outputStream.write(zipData, 0, zipData.length-2);
|
|
|
|
outputStream.write(total_size & 0xff);
|
|
|
|
outputStream.write((total_size >> 8) & 0xff);
|
|
|
|
temp.writeTo(outputStream);
|
|
|
|
}
|
|
|
|
|
2009-07-16 06:43:39 +08:00
|
|
|
/**
|
|
|
|
* Copy all the files in a manifest from input to output. We set
|
|
|
|
* the modification times in the output to a fixed time, so as to
|
|
|
|
* reduce variation in the output file and make incremental OTAs
|
|
|
|
* more efficient.
|
|
|
|
*/
|
2009-03-04 11:28:42 +08:00
|
|
|
private static void copyFiles(Manifest manifest,
|
2009-07-16 06:43:39 +08:00
|
|
|
JarFile in, JarOutputStream out, long timestamp) throws IOException {
|
2009-03-04 11:28:42 +08:00
|
|
|
byte[] buffer = new byte[4096];
|
|
|
|
int num;
|
|
|
|
|
|
|
|
Map<String, Attributes> entries = manifest.getEntries();
|
|
|
|
List<String> names = new ArrayList(entries.keySet());
|
|
|
|
Collections.sort(names);
|
|
|
|
for (String name : names) {
|
|
|
|
JarEntry inEntry = in.getJarEntry(name);
|
2009-07-16 06:43:39 +08:00
|
|
|
JarEntry outEntry = null;
|
2009-03-04 11:28:42 +08:00
|
|
|
if (inEntry.getMethod() == JarEntry.STORED) {
|
|
|
|
// Preserve the STORED method of the input entry.
|
2009-07-16 06:43:39 +08:00
|
|
|
outEntry = new JarEntry(inEntry);
|
2009-03-04 11:28:42 +08:00
|
|
|
} else {
|
|
|
|
// Create a new entry so that the compressed len is recomputed.
|
2009-07-16 06:43:39 +08:00
|
|
|
outEntry = new JarEntry(name);
|
2009-03-04 11:28:42 +08:00
|
|
|
}
|
2009-07-16 06:43:39 +08:00
|
|
|
outEntry.setTime(timestamp);
|
|
|
|
out.putNextEntry(outEntry);
|
2009-03-04 11:28:42 +08:00
|
|
|
|
|
|
|
InputStream data = in.getInputStream(inEntry);
|
|
|
|
while ((num = data.read(buffer)) > 0) {
|
|
|
|
out.write(buffer, 0, num);
|
|
|
|
}
|
|
|
|
out.flush();
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
public static void main(String[] args) {
|
2009-08-13 09:20:24 +08:00
|
|
|
if (args.length != 4 && args.length != 5) {
|
|
|
|
System.err.println("Usage: signapk [-w] " +
|
2009-03-04 11:28:42 +08:00
|
|
|
"publickey.x509[.pem] privatekey.pk8 " +
|
|
|
|
"input.jar output.jar");
|
|
|
|
System.exit(2);
|
|
|
|
}
|
|
|
|
|
2009-08-13 09:20:24 +08:00
|
|
|
boolean signWholeFile = false;
|
|
|
|
int argstart = 0;
|
|
|
|
if (args[0].equals("-w")) {
|
|
|
|
signWholeFile = true;
|
|
|
|
argstart = 1;
|
|
|
|
}
|
|
|
|
|
2009-03-04 11:28:42 +08:00
|
|
|
JarFile inputJar = null;
|
|
|
|
JarOutputStream outputJar = null;
|
2009-08-13 09:20:24 +08:00
|
|
|
FileOutputStream outputFile = null;
|
2009-03-04 11:28:42 +08:00
|
|
|
|
|
|
|
try {
|
2012-05-12 00:20:50 +08:00
|
|
|
File publicKeyFile = new File(args[argstart+0]);
|
|
|
|
X509Certificate publicKey = readPublicKey(publicKeyFile);
|
2009-03-04 11:28:42 +08:00
|
|
|
|
|
|
|
// Assume the certificate is valid for at least an hour.
|
|
|
|
long timestamp = publicKey.getNotBefore().getTime() + 3600L * 1000;
|
|
|
|
|
2009-08-13 09:20:24 +08:00
|
|
|
PrivateKey privateKey = readPrivateKey(new File(args[argstart+1]));
|
|
|
|
inputJar = new JarFile(new File(args[argstart+2]), false); // Don't verify.
|
|
|
|
|
|
|
|
OutputStream outputStream = null;
|
|
|
|
if (signWholeFile) {
|
|
|
|
outputStream = new ByteArrayOutputStream();
|
|
|
|
} else {
|
|
|
|
outputStream = outputFile = new FileOutputStream(args[argstart+3]);
|
|
|
|
}
|
|
|
|
outputJar = new JarOutputStream(outputStream);
|
2009-03-04 11:28:42 +08:00
|
|
|
outputJar.setLevel(9);
|
|
|
|
|
|
|
|
JarEntry je;
|
|
|
|
|
|
|
|
Manifest manifest = addDigestsToManifest(inputJar);
|
2012-05-12 00:20:50 +08:00
|
|
|
|
|
|
|
// Everything else
|
|
|
|
copyFiles(manifest, inputJar, outputJar, timestamp);
|
|
|
|
|
|
|
|
// otacert
|
|
|
|
if (signWholeFile) {
|
|
|
|
addOtacert(outputJar, publicKeyFile, timestamp, manifest);
|
|
|
|
}
|
|
|
|
|
|
|
|
// MANIFEST.MF
|
2009-03-04 11:28:42 +08:00
|
|
|
je = new JarEntry(JarFile.MANIFEST_NAME);
|
|
|
|
je.setTime(timestamp);
|
|
|
|
outputJar.putNextEntry(je);
|
|
|
|
manifest.write(outputJar);
|
|
|
|
|
|
|
|
// CERT.SF
|
|
|
|
Signature signature = Signature.getInstance("SHA1withRSA");
|
|
|
|
signature.initSign(privateKey);
|
|
|
|
je = new JarEntry(CERT_SF_NAME);
|
|
|
|
je.setTime(timestamp);
|
|
|
|
outputJar.putNextEntry(je);
|
|
|
|
writeSignatureFile(manifest,
|
|
|
|
new SignatureOutputStream(outputJar, signature));
|
|
|
|
|
|
|
|
// CERT.RSA
|
|
|
|
je = new JarEntry(CERT_RSA_NAME);
|
|
|
|
je.setTime(timestamp);
|
|
|
|
outputJar.putNextEntry(je);
|
|
|
|
writeSignatureBlock(signature, publicKey, outputJar);
|
|
|
|
|
2009-08-13 09:20:24 +08:00
|
|
|
outputJar.close();
|
|
|
|
outputJar = null;
|
|
|
|
outputStream.flush();
|
|
|
|
|
|
|
|
if (signWholeFile) {
|
|
|
|
outputFile = new FileOutputStream(args[argstart+3]);
|
|
|
|
signWholeOutputFile(((ByteArrayOutputStream)outputStream).toByteArray(),
|
|
|
|
outputFile, publicKey, privateKey);
|
|
|
|
}
|
2009-03-04 11:28:42 +08:00
|
|
|
} catch (Exception e) {
|
|
|
|
e.printStackTrace();
|
|
|
|
System.exit(1);
|
|
|
|
} finally {
|
|
|
|
try {
|
|
|
|
if (inputJar != null) inputJar.close();
|
2009-08-13 09:20:24 +08:00
|
|
|
if (outputFile != null) outputFile.close();
|
2009-03-04 11:28:42 +08:00
|
|
|
} catch (IOException e) {
|
|
|
|
e.printStackTrace();
|
|
|
|
System.exit(1);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|