| /* |
| * Copyright (C) 2008 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 com.android.signapk; |
| |
| import sun.misc.BASE64Encoder; |
| import sun.security.pkcs.ContentInfo; |
| import sun.security.pkcs.PKCS7; |
| import sun.security.pkcs.SignerInfo; |
| import sun.security.x509.AlgorithmId; |
| import sun.security.x509.X500Name; |
| |
| import java.io.BufferedReader; |
| import java.io.ByteArrayOutputStream; |
| import java.io.DataInputStream; |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.FileOutputStream; |
| import java.io.FilterOutputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.InputStreamReader; |
| import java.io.OutputStream; |
| import java.io.PrintStream; |
| import java.security.AlgorithmParameters; |
| import java.security.DigestOutputStream; |
| import java.security.GeneralSecurityException; |
| import java.security.Key; |
| import java.security.KeyFactory; |
| import java.security.MessageDigest; |
| import java.security.PrivateKey; |
| import java.security.Signature; |
| import java.security.SignatureException; |
| import java.security.cert.Certificate; |
| import java.security.cert.CertificateFactory; |
| import java.security.cert.X509Certificate; |
| import java.security.spec.InvalidKeySpecException; |
| import java.security.spec.KeySpec; |
| import java.security.spec.PKCS8EncodedKeySpec; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.Date; |
| import java.util.Enumeration; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.TreeMap; |
| import java.util.jar.Attributes; |
| import java.util.jar.JarEntry; |
| import java.util.jar.JarFile; |
| import java.util.jar.JarOutputStream; |
| import java.util.jar.Manifest; |
| import java.util.regex.Pattern; |
| import javax.crypto.Cipher; |
| import javax.crypto.EncryptedPrivateKeyInfo; |
| import javax.crypto.SecretKeyFactory; |
| import javax.crypto.spec.PBEKeySpec; |
| |
| /** |
| * Command line tool to sign JAR files (including APKs and OTA updates) in |
| * a way compatible with the mincrypt verifier, using SHA1 and RSA keys. |
| */ |
| class SignApk { |
| private static final String CERT_SF_NAME = "META-INF/CERT.SF"; |
| private static final String CERT_RSA_NAME = "META-INF/CERT.RSA"; |
| |
| // Files matching this pattern are not copied to the output. |
| private static Pattern stripPattern = |
| Pattern.compile("^META-INF/(.*)[.](SF|RSA|DSA)$"); |
| |
| private static X509Certificate readPublicKey(File file) |
| throws IOException, GeneralSecurityException { |
| FileInputStream input = new FileInputStream(file); |
| try { |
| CertificateFactory cf = CertificateFactory.getInstance("X.509"); |
| return (X509Certificate) cf.generateCertificate(input); |
| } finally { |
| input.close(); |
| } |
| } |
| |
| /** |
| * Reads the password from stdin and returns it as a string. |
| * |
| * @param keyFile The file containing the private key. Used to prompt the user. |
| */ |
| private static String readPassword(File keyFile) { |
| // TODO: use Console.readPassword() when it's available. |
| System.out.print("Enter password for " + keyFile + " (password will not be hidden): "); |
| System.out.flush(); |
| BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in)); |
| try { |
| return stdin.readLine(); |
| } catch (IOException ex) { |
| return null; |
| } |
| } |
| |
| /** |
| * Decrypt an encrypted PKCS 8 format private key. |
| * |
| * Based on ghstark's post on Aug 6, 2006 at |
| * http://forums.sun.com/thread.jspa?threadID=758133&messageID=4330949 |
| * |
| * @param encryptedPrivateKey The raw data of the private key |
| * @param keyFile The file containing the private key |
| */ |
| private static KeySpec decryptPrivateKey(byte[] encryptedPrivateKey, File keyFile) |
| throws GeneralSecurityException { |
| EncryptedPrivateKeyInfo epkInfo; |
| try { |
| epkInfo = new EncryptedPrivateKeyInfo(encryptedPrivateKey); |
| } catch (IOException ex) { |
| // Probably not an encrypted key. |
| return null; |
| } |
| |
| char[] password = readPassword(keyFile).toCharArray(); |
| |
| SecretKeyFactory skFactory = SecretKeyFactory.getInstance(epkInfo.getAlgName()); |
| Key key = skFactory.generateSecret(new PBEKeySpec(password)); |
| |
| Cipher cipher = Cipher.getInstance(epkInfo.getAlgName()); |
| cipher.init(Cipher.DECRYPT_MODE, key, epkInfo.getAlgParameters()); |
| |
| try { |
| return epkInfo.getKeySpec(cipher); |
| } catch (InvalidKeySpecException ex) { |
| System.err.println("signapk: Password for " + keyFile + " may be bad."); |
| throw ex; |
| } |
| } |
| |
| /** Read a PKCS 8 format private key. */ |
| private static PrivateKey readPrivateKey(File file) |
| throws IOException, GeneralSecurityException { |
| DataInputStream input = new DataInputStream(new FileInputStream(file)); |
| try { |
| byte[] bytes = new byte[(int) file.length()]; |
| input.read(bytes); |
| |
| KeySpec spec = decryptPrivateKey(bytes, file); |
| if (spec == null) { |
| spec = new PKCS8EncodedKeySpec(bytes); |
| } |
| |
| try { |
| return KeyFactory.getInstance("RSA").generatePrivate(spec); |
| } catch (InvalidKeySpecException ex) { |
| return KeyFactory.getInstance("DSA").generatePrivate(spec); |
| } |
| } finally { |
| input.close(); |
| } |
| } |
| |
| /** Add the SHA1 of every file to the manifest, creating it if necessary. */ |
| private static Manifest addDigestsToManifest(JarFile jar) |
| throws IOException, GeneralSecurityException { |
| Manifest input = jar.getManifest(); |
| Manifest output = new Manifest(); |
| Attributes main = output.getMainAttributes(); |
| if (input != null) { |
| main.putAll(input.getMainAttributes()); |
| } else { |
| main.putValue("Manifest-Version", "1.0"); |
| main.putValue("Created-By", "1.0 (Android SignApk)"); |
| } |
| |
| BASE64Encoder base64 = new BASE64Encoder(); |
| MessageDigest md = MessageDigest.getInstance("SHA1"); |
| byte[] buffer = new byte[4096]; |
| int num; |
| |
| // We sort the input entries by name, and add them to the |
| // output manifest in sorted order. We expect that the output |
| // map will be deterministic. |
| |
| TreeMap<String, JarEntry> byName = new TreeMap<String, JarEntry>(); |
| |
| for (Enumeration<JarEntry> e = jar.entries(); e.hasMoreElements(); ) { |
| JarEntry entry = e.nextElement(); |
| byName.put(entry.getName(), entry); |
| } |
| |
| for (JarEntry entry: byName.values()) { |
| String name = entry.getName(); |
| if (!entry.isDirectory() && !name.equals(JarFile.MANIFEST_NAME) && |
| !name.equals(CERT_SF_NAME) && !name.equals(CERT_RSA_NAME) && |
| (stripPattern == null || |
| !stripPattern.matcher(name).matches())) { |
| InputStream data = jar.getInputStream(entry); |
| while ((num = data.read(buffer)) > 0) { |
| md.update(buffer, 0, num); |
| } |
| |
| Attributes attr = null; |
| if (input != null) attr = input.getAttributes(name); |
| attr = attr != null ? new Attributes(attr) : new Attributes(); |
| attr.putValue("SHA1-Digest", base64.encode(md.digest())); |
| output.getEntries().put(name, attr); |
| } |
| } |
| |
| return output; |
| } |
| |
| /** Write to another stream and also feed it to the Signature object. */ |
| private static class SignatureOutputStream extends FilterOutputStream { |
| private Signature mSignature; |
| |
| public SignatureOutputStream(OutputStream out, Signature sig) { |
| super(out); |
| mSignature = sig; |
| } |
| |
| @Override |
| public void write(int b) throws IOException { |
| try { |
| mSignature.update((byte) b); |
| } catch (SignatureException e) { |
| throw new IOException("SignatureException: " + e); |
| } |
| super.write(b); |
| } |
| |
| @Override |
| public void write(byte[] b, int off, int len) throws IOException { |
| try { |
| mSignature.update(b, off, len); |
| } catch (SignatureException e) { |
| throw new IOException("SignatureException: " + e); |
| } |
| super.write(b, off, len); |
| } |
| } |
| |
| /** Write a .SF file with a digest the specified manifest. */ |
| private static void writeSignatureFile(Manifest manifest, OutputStream out) |
| throws IOException, GeneralSecurityException { |
| Manifest sf = new Manifest(); |
| Attributes main = sf.getMainAttributes(); |
| main.putValue("Signature-Version", "1.0"); |
| main.putValue("Created-By", "1.0 (Android SignApk)"); |
| |
| BASE64Encoder base64 = new BASE64Encoder(); |
| MessageDigest md = MessageDigest.getInstance("SHA1"); |
| PrintStream print = new PrintStream( |
| new DigestOutputStream(new ByteArrayOutputStream(), md), |
| true, "UTF-8"); |
| |
| // Digest of the entire manifest |
| manifest.write(print); |
| print.flush(); |
| main.putValue("SHA1-Digest-Manifest", base64.encode(md.digest())); |
| |
| Map<String, Attributes> entries = manifest.getEntries(); |
| for (Map.Entry<String, Attributes> entry : entries.entrySet()) { |
| // Digest of the manifest stanza for this entry. |
| print.print("Name: " + entry.getKey() + "\r\n"); |
| for (Map.Entry<Object, Object> att : entry.getValue().entrySet()) { |
| print.print(att.getKey() + ": " + att.getValue() + "\r\n"); |
| } |
| print.print("\r\n"); |
| print.flush(); |
| |
| Attributes sfAttr = new Attributes(); |
| sfAttr.putValue("SHA1-Digest", base64.encode(md.digest())); |
| sf.getEntries().put(entry.getKey(), sfAttr); |
| } |
| |
| sf.write(out); |
| } |
| |
| /** Write a .RSA file with a digital signature. */ |
| private static void writeSignatureBlock( |
| Signature signature, X509Certificate publicKey, OutputStream out) |
| throws IOException, GeneralSecurityException { |
| SignerInfo signerInfo = new SignerInfo( |
| new X500Name(publicKey.getIssuerX500Principal().getName()), |
| publicKey.getSerialNumber(), |
| AlgorithmId.get("SHA1"), |
| AlgorithmId.get("RSA"), |
| signature.sign()); |
| |
| PKCS7 pkcs7 = new PKCS7( |
| new AlgorithmId[] { AlgorithmId.get("SHA1") }, |
| new ContentInfo(ContentInfo.DATA_OID, null), |
| new X509Certificate[] { publicKey }, |
| new SignerInfo[] { signerInfo }); |
| |
| pkcs7.encodeSignedData(out); |
| } |
| |
| /** |
| * 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. |
| */ |
| private static void copyFiles(Manifest manifest, |
| JarFile in, JarOutputStream out, long timestamp) throws IOException { |
| 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); |
| JarEntry outEntry = null; |
| if (inEntry.getMethod() == JarEntry.STORED) { |
| // Preserve the STORED method of the input entry. |
| outEntry = new JarEntry(inEntry); |
| } else { |
| // Create a new entry so that the compressed len is recomputed. |
| outEntry = new JarEntry(name); |
| } |
| outEntry.setTime(timestamp); |
| out.putNextEntry(outEntry); |
| |
| InputStream data = in.getInputStream(inEntry); |
| while ((num = data.read(buffer)) > 0) { |
| out.write(buffer, 0, num); |
| } |
| out.flush(); |
| } |
| } |
| |
| public static void main(String[] args) { |
| if (args.length != 4) { |
| System.err.println("Usage: signapk " + |
| "publickey.x509[.pem] privatekey.pk8 " + |
| "input.jar output.jar"); |
| System.exit(2); |
| } |
| |
| JarFile inputJar = null; |
| JarOutputStream outputJar = null; |
| |
| try { |
| X509Certificate publicKey = readPublicKey(new File(args[0])); |
| |
| // Assume the certificate is valid for at least an hour. |
| long timestamp = publicKey.getNotBefore().getTime() + 3600L * 1000; |
| |
| PrivateKey privateKey = readPrivateKey(new File(args[1])); |
| inputJar = new JarFile(new File(args[2]), false); // Don't verify. |
| outputJar = new JarOutputStream(new FileOutputStream(args[3])); |
| outputJar.setLevel(9); |
| |
| JarEntry je; |
| |
| // MANIFEST.MF |
| Manifest manifest = addDigestsToManifest(inputJar); |
| 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); |
| |
| // Everything else |
| copyFiles(manifest, inputJar, outputJar, timestamp); |
| } catch (Exception e) { |
| e.printStackTrace(); |
| System.exit(1); |
| } finally { |
| try { |
| if (inputJar != null) inputJar.close(); |
| if (outputJar != null) outputJar.close(); |
| } catch (IOException e) { |
| e.printStackTrace(); |
| System.exit(1); |
| } |
| } |
| } |
| } |