/*
* 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 org.bouncycastle.asn1.ASN1InputStream;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.DEROutputStream;
import org.bouncycastle.asn1.cms.CMSObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
import org.bouncycastle.cert.jcajce.JcaCertStore;
import org.bouncycastle.cms.CMSException;
import org.bouncycastle.cms.CMSProcessableByteArray;
import org.bouncycastle.cms.CMSSignedData;
import org.bouncycastle.cms.CMSSignedDataGenerator;
import org.bouncycastle.cms.CMSTypedData;
import org.bouncycastle.cms.jcajce.JcaSignerInfoGeneratorBuilder;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.operator.ContentSigner;
import org.bouncycastle.operator.OperatorCreationException;
import org.bouncycastle.operator.jcajce.JcaContentSignerBuilder;
import org.bouncycastle.operator.jcajce.JcaDigestCalculatorProviderBuilder;
import org.bouncycastle.util.encoders.Base64;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
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.lang.reflect.Constructor;
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.Provider;
import java.security.Security;
import java.security.cert.CertificateEncodingException;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;
import java.util.Locale;
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;
/**
* HISTORICAL NOTE:
*
* Prior to the keylimepie release, SignApk ignored the signature
* algorithm specified in the certificate and always used SHA1withRSA.
*
* Starting with JB-MR2, the platform supports SHA256withRSA, so we use
* the signature algorithm in the certificate to select which to use
* (SHA256withRSA or SHA1withRSA). Also in JB-MR2, EC keys are supported.
*
* Because there are old keys still in use whose certificate actually
* says "MD5withRSA", we treat these as though they say "SHA1withRSA"
* for compatibility with older releases. This can be changed by
* altering the getAlgorithm() function below.
*/
/**
* Command line tool to sign JAR files (including APKs and OTA updates) in a way
* compatible with the mincrypt verifier, using EC or RSA keys and SHA1 or
* SHA-256 (see historical note).
*/
class SignApk {
private static final String CERT_SF_NAME = "META-INF/CERT.SF";
private static final String CERT_SIG_NAME = "META-INF/CERT.%s";
private static final String CERT_SF_MULTI_NAME = "META-INF/CERT%d.SF";
private static final String CERT_SIG_MULTI_NAME = "META-INF/CERT%d.%s";
private static final String OTACERT_NAME = "META-INF/com/android/otacert";
private static Provider sBouncyCastleProvider;
// bitmasks for which hash algorithms we need the manifest to include.
private static final int USE_SHA1 = 1;
private static final int USE_SHA256 = 2;
/**
* Return one of USE_SHA1 or USE_SHA256 according to the signature
* algorithm specified in the cert.
*/
private static int getDigestAlgorithm(X509Certificate cert) {
String sigAlg = cert.getSigAlgName().toUpperCase(Locale.US);
if ("SHA1WITHRSA".equals(sigAlg) ||
"MD5WITHRSA".equals(sigAlg)) { // see "HISTORICAL NOTE" above.
return USE_SHA1;
} else if (sigAlg.startsWith("SHA256WITH")) {
return USE_SHA256;
} else {
throw new IllegalArgumentException("unsupported signature algorithm \"" + sigAlg +
"\" in cert [" + cert.getSubjectDN());
}
}
/** Returns the expected signature algorithm for this key type. */
private static String getSignatureAlgorithm(X509Certificate cert) {
String sigAlg = cert.getSigAlgName().toUpperCase(Locale.US);
String keyType = cert.getPublicKey().getAlgorithm().toUpperCase(Locale.US);
if ("RSA".equalsIgnoreCase(keyType)) {
if (getDigestAlgorithm(cert) == USE_SHA256) {
return "SHA256withRSA";
} else {
return "SHA1withRSA";
}
} else if ("EC".equalsIgnoreCase(keyType)) {
return "SHA256withECDSA";
} else {
throw new IllegalArgumentException("unsupported key type: " + keyType);
}
}
// Files matching this pattern are not copied to the output.
private static Pattern stripPattern =
Pattern.compile("^(META-INF/((.*)[.](SF|RSA|DSA|EC)|com/android/otacert))|(" +
Pattern.quote(JarFile.MANIFEST_NAME) + ")$");
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 PKCS8EncodedKeySpec 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);
/* Check to see if this is in an EncryptedPrivateKeyInfo structure. */
PKCS8EncodedKeySpec spec = decryptPrivateKey(bytes, file);
if (spec == null) {
spec = new PKCS8EncodedKeySpec(bytes);
}
/*
* Now it's in a PKCS#8 PrivateKeyInfo structure. Read its Algorithm
* OID and use that to construct a KeyFactory.
*/
ASN1InputStream bIn = new ASN1InputStream(new ByteArrayInputStream(spec.getEncoded()));
PrivateKeyInfo pki = PrivateKeyInfo.getInstance(bIn.readObject());
String algOid = pki.getPrivateKeyAlgorithm().getAlgorithm().getId();
return KeyFactory.getInstance(algOid).generatePrivate(spec);
} finally {
input.close();
}
}
/**
* Add the hash(es) of every file to the manifest, creating it if
* necessary.
*/
private static Manifest addDigestsToManifest(JarFile jar, int hashes)
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)");
}
MessageDigest md_sha1 = null;
MessageDigest md_sha256 = null;
if ((hashes & USE_SHA1) != 0) {
md_sha1 = MessageDigest.getInstance("SHA1");
}
if ((hashes & USE_SHA256) != 0) {
md_sha256 = MessageDigest.getInstance("SHA256");
}
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() &&
(stripPattern == null || !stripPattern.matcher(name).matches())) {
InputStream data = jar.getInputStream(entry);
while ((num = data.read(buffer)) > 0) {
if (md_sha1 != null) md_sha1.update(buffer, 0, num);
if (md_sha256 != null) md_sha256.update(buffer, 0, num);
}
Attributes attr = null;
if (input != null) attr = input.getAttributes(name);
attr = attr != null ? new Attributes(attr) : new Attributes();
if (md_sha1 != null) {
attr.putValue("SHA1-Digest",
new String(Base64.encode(md_sha1.digest()), "ASCII"));
}
if (md_sha256 != null) {
attr.putValue("SHA-256-Digest",
new String(Base64.encode(md_sha256.digest()), "ASCII"));
}
output.getEntries().put(name, attr);
}
}
return output;
}
/**
* Add a copy of the public key to the archive; this should
* exactly match one of the files in
* /system/etc/security/otacerts.zip on the device. (The same
* cert can be extracted from the CERT.RSA file but this is much
* easier to get at.)
*/
private static void addOtacert(JarOutputStream outputJar,
File publicKeyFile,
long timestamp,
Manifest manifest,
int hash)
throws IOException, GeneralSecurityException {
MessageDigest md = MessageDigest.getInstance(hash == USE_SHA1 ? "SHA1" : "SHA256");
JarEntry je = new JarEntry(OTACERT_NAME);
je.setTime(timestamp);
outputJar.putNextEntry(je);
FileInputStream input = new FileInputStream(publicKeyFile);
byte[] b = new byte[4096];
int read;
while ((read = input.read(b)) != -1) {
outputJar.write(b, 0, read);
md.update(b, 0, read);
}
input.close();
Attributes attr = new Attributes();
attr.putValue(hash == USE_SHA1 ? "SHA1-Digest" : "SHA-256-Digest",
new String(Base64.encode(md.digest()), "ASCII"));
manifest.getEntries().put(OTACERT_NAME, attr);
}
/** Write to another stream and track how many bytes have been
* written.
*/
private static class CountOutputStream extends FilterOutputStream {
private int mCount;
public CountOutputStream(OutputStream out) {
super(out);
mCount = 0;
}
@Override
public void write(int b) throws IOException {
super.write(b);
mCount++;
}
@Override
public void write(byte[] b, int off, int len) throws IOException {
super.write(b, off, len);
mCount += len;
}
public int size() {
return mCount;
}
}
/** Write a .SF file with a digest of the specified manifest. */
private static void writeSignatureFile(Manifest manifest, OutputStream out,
int hash)
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)");
MessageDigest md = MessageDigest.getInstance(
hash == USE_SHA256 ? "SHA256" : "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(hash == USE_SHA256 ? "SHA-256-Digest-Manifest" : "SHA1-Digest-Manifest",
new String(Base64.encode(md.digest()), "ASCII"));
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(hash == USE_SHA256 ? "SHA-256-Digest" : "SHA1-Digest-Manifest",
new String(Base64.encode(md.digest()), "ASCII"));
sf.getEntries().put(entry.getKey(), sfAttr);
}
CountOutputStream cout = new CountOutputStream(out);
sf.write(cout);
// A bug in the java.util.jar implementation of Android platforms
// up to version 1.6 will cause a spurious IOException to be thrown
// if the length of the signature file is a multiple of 1024 bytes.
// As a workaround, add an extra CRLF in this case.
if ((cout.size() % 1024) == 0) {
cout.write('\r');
cout.write('\n');
}
}
/** Sign data and write the digital signature to 'out'. */
private static void writeSignatureBlock(
CMSTypedData data, X509Certificate publicKey, PrivateKey privateKey,
OutputStream out)
throws IOException,
CertificateEncodingException,
OperatorCreationException,
CMSException {
ArrayList<X509Certificate> certList = new ArrayList<X509Certificate>(1);
certList.add(publicKey);
JcaCertStore certs = new JcaCertStore(certList);
CMSSignedDataGenerator gen = new CMSSignedDataGenerator();
ContentSigner signer = new JcaContentSignerBuilder(getSignatureAlgorithm(publicKey))
.setProvider(sBouncyCastleProvider)
.build(privateKey);
gen.addSignerInfoGenerator(
new JcaSignerInfoGeneratorBuilder(
new JcaDigestCalculatorProviderBuilder()
.setProvider(sBouncyCastleProvider)
.build())
.setDirectSignature(true)
.build(signer, publicKey));
gen.addCertificates(certs);
CMSSignedData sigData = gen.generate(data, false);
ASN1InputStream asn1 = new ASN1InputStream(sigData.getEncoded());
DEROutputStream dos = new DEROutputStream(out);
dos.writeObject(asn1.readObject());
}
/**
* 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, int alignment) throws IOException {
byte[] buffer = new byte[4096];
int num;
Map<String, Attributes> entries = manifest.getEntries();
ArrayList<String> names = new ArrayList<String>(entries.keySet());
Collections.sort(names);
boolean firstEntry = true;
long offset = 0L;
// We do the copy in two passes -- first copying all the
// entries that are STORED, then copying all the entries that
// have any other compression flag (which in practice means
// DEFLATED). This groups all the stored entries together at
// the start of the file and makes it easier to do alignment
// on them (since only stored entries are aligned).
for (String name : names) {
JarEntry inEntry = in.getJarEntry(name);
JarEntry outEntry = null;
if (inEntry.getMethod() != JarEntry.STORED) continue;
// Preserve the STORED method of the input entry.
outEntry = new JarEntry(inEntry);
outEntry.setTime(timestamp);
// 'offset' is the offset into the file at which we expect
// the file data to begin. This is the value we need to
// make a multiple of 'alignement'.
offset += JarFile.LOCHDR + outEntry.getName().length();
if (firstEntry) {
// The first entry in a jar file has an extra field of
// four bytes that you can't get rid of; any extra
// data you specify in the JarEntry is appended to
// these forced four bytes. This is JAR_MAGIC in
// JarOutputStream; the bytes are 0xfeca0000.
offset += 4;
firstEntry = false;
}
if (alignment > 0 && (offset % alignment != 0)) {
// Set the "extra data" of the entry to between 1 and
// alignment-1 bytes, to make the file data begin at
// an aligned offset.
int needed = alignment - (int)(offset % alignment);
outEntry.setExtra(new byte[needed]);
offset += needed;
}
out.putNextEntry(outEntry);
InputStream data = in.getInputStream(inEntry);
while ((num = data.read(buffer)) > 0) {
out.write(buffer, 0, num);
offset += num;
}
out.flush();
}
// Copy all the non-STORED entries. We don't attempt to
// maintain the 'offset' variable past this point; we don't do
// alignment on these entries.
for (String name : names) {
JarEntry inEntry = in.getJarEntry(name);
JarEntry outEntry = null;
if (inEntry.getMethod() == JarEntry.STORED) continue;
// 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();
}
}
private static class WholeFileSignerOutputStream extends FilterOutputStream {
private boolean closing = false;
private ByteArrayOutputStream footer = new ByteArrayOutputStream();
private OutputStream tee;
public WholeFileSignerOutputStream(OutputStream out, OutputStream tee) {
super(out);
this.tee = tee;
}
public void notifyClosing() {
closing = true;
}
public void finish() throws IOException {
closing = false;
byte[] data = footer.toByteArray();
if (data.length < 2)
throw new IOException("Less than two bytes written to footer");
write(data, 0, data.length - 2);
}
public byte[] getTail() {
return footer.toByteArray();
}
@Override
public void write(byte[] b) throws IOException {
write(b, 0, b.length);
}
@Override
public void write(byte[] b, int off, int len) throws IOException {
if (closing) {
// if the jar is about to close, save the footer that will be written
footer.write(b, off, len);
}
else {
// write to both output streams. out is the CMSTypedData signer and tee is the file.
out.write(b, off, len);
tee.write(b, off, len);
}
}
@Override
public void write(int b) throws IOException {
if (closing) {
// if the jar is about to close, save the footer that will be written
footer.write(b);
}
else {
// write to both output streams. out is the CMSTypedData signer and tee is the file.
out.write(b);
tee.write(b);
}
}
}
private static class CMSSigner implements CMSTypedData {
private JarFile inputJar;
private File publicKeyFile;
private X509Certificate publicKey;
private PrivateKey privateKey;
private String outputFile;
private OutputStream outputStream;
private final ASN1ObjectIdentifier type;
private WholeFileSignerOutputStream signer;
public CMSSigner(JarFile inputJar, File publicKeyFile,
X509Certificate publicKey, PrivateKey privateKey,
OutputStream outputStream) {
this.inputJar = inputJar;
this.publicKeyFile = publicKeyFile;
this.publicKey = publicKey;
this.privateKey = privateKey;
this.outputStream = outputStream;
this.type = new ASN1ObjectIdentifier(CMSObjectIdentifiers.data.getId());
}
/**
* This should actually return byte[] or something similar, but nothing
* actually checks it currently.
*/
public Object getContent() {
return this;
}
public ASN1ObjectIdentifier getContentType() {
return type;
}
public void write(OutputStream out) throws IOException {
try {
signer = new WholeFileSignerOutputStream(out, outputStream);
JarOutputStream outputJar = new JarOutputStream(signer);
int hash = getDigestAlgorithm(publicKey);
// Assume the certificate is valid for at least an hour.
long timestamp = publicKey.getNotBefore().getTime() + 3600L * 1000;
Manifest manifest = addDigestsToManifest(inputJar, hash);
copyFiles(manifest, inputJar, outputJar, timestamp, 0);
addOtacert(outputJar, publicKeyFile, timestamp, manifest, hash);
signFile(manifest, inputJar,
new X509Certificate[]{ publicKey },
new PrivateKey[]{ privateKey },
outputJar);
signer.notifyClosing();
outputJar.close();
signer.finish();
}
catch (Exception e) {
throw new IOException(e);
}
}
public void writeSignatureBlock(ByteArrayOutputStream temp)
throws IOException,
CertificateEncodingException,
OperatorCreationException,
CMSException {
SignApk.writeSignatureBlock(this, publicKey, privateKey, temp);
}
public WholeFileSignerOutputStream getSigner() {
return signer;
}
}
private static void signWholeFile(JarFile inputJar, File publicKeyFile,
X509Certificate publicKey, PrivateKey privateKey,
OutputStream outputStream) throws Exception {
CMSSigner cmsOut = new CMSSigner(inputJar, publicKeyFile,
publicKey, privateKey, outputStream);
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);
cmsOut.writeSignatureBlock(temp);
byte[] zipData = cmsOut.getSigner().getTail();
// 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");
}
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);
// 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 size. 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);
temp.write(total_size & 0xff);
temp.write((total_size >> 8) & 0xff);
temp.flush();
// 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);
}
}
outputStream.write(total_size & 0xff);
outputStream.write((total_size >> 8) & 0xff);
temp.writeTo(outputStream);
}
private static void signFile(Manifest manifest, JarFile inputJar,
X509Certificate[] publicKey, PrivateKey[] privateKey,
JarOutputStream outputJar)
throws Exception {
// Assume the certificate is valid for at least an hour.
long timestamp = publicKey[0].getNotBefore().getTime() + 3600L * 1000;
// MANIFEST.MF
JarEntry je = new JarEntry(JarFile.MANIFEST_NAME);
je.setTime(timestamp);
outputJar.putNextEntry(je);
manifest.write(outputJar);
int numKeys = publicKey.length;
for (int k = 0; k < numKeys; ++k) {
// CERT.SF / CERT#.SF
je = new JarEntry(numKeys == 1 ? CERT_SF_NAME :
(String.format(CERT_SF_MULTI_NAME, k)));
je.setTime(timestamp);
outputJar.putNextEntry(je);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
writeSignatureFile(manifest, baos, getDigestAlgorithm(publicKey[k]));
byte[] signedData = baos.toByteArray();
outputJar.write(signedData);
// CERT.{EC,RSA} / CERT#.{EC,RSA}
final String keyType = publicKey[k].getPublicKey().getAlgorithm();
je = new JarEntry(numKeys == 1 ?
(String.format(CERT_SIG_NAME, keyType)) :
(String.format(CERT_SIG_MULTI_NAME, k, keyType)));
je.setTime(timestamp);
outputJar.putNextEntry(je);
writeSignatureBlock(new CMSProcessableByteArray(signedData),
publicKey[k], privateKey[k], outputJar);
}
}
/**
* Tries to load a JSE Provider by class name. This is for custom PrivateKey
* types that might be stored in PKCS#11-like storage.
*/
private static void loadProviderIfNecessary(String providerClassName) {
if (providerClassName == null) {
return;
}
final Class<?> klass;
try {
final ClassLoader sysLoader = ClassLoader.getSystemClassLoader();
if (sysLoader != null) {
klass = sysLoader.loadClass(providerClassName);
} else {
klass = Class.forName(providerClassName);
}
} catch (ClassNotFoundException e) {
e.printStackTrace();
System.exit(1);
return;
}
Constructor<?> constructor = null;
for (Constructor<?> c : klass.getConstructors()) {
if (c.getParameterTypes().length == 0) {
constructor = c;
break;
}
}
if (constructor == null) {
System.err.println("No zero-arg constructor found for " + providerClassName);
System.exit(1);
return;
}
final Object o;
try {
o = constructor.newInstance();
} catch (Exception e) {
e.printStackTrace();
System.exit(1);
return;
}
if (!(o instanceof Provider)) {
System.err.println("Not a Provider class: " + providerClassName);
System.exit(1);
}
Security.insertProviderAt((Provider) o, 1);
}
private static void usage() {
System.err.println("Usage: signapk [-w] " +
"[-a <alignment>] " +
"[-providerClass <className>] " +
"publickey.x509[.pem] privatekey.pk8 " +
"[publickey2.x509[.pem] privatekey2.pk8 ...] " +
"input.jar output.jar");
System.exit(2);
}
public static void main(String[] args) {
if (args.length < 4) usage();
sBouncyCastleProvider = new BouncyCastleProvider();
Security.addProvider(sBouncyCastleProvider);
boolean signWholeFile = false;
String providerClass = null;
String providerArg = null;
int alignment = 4;
int argstart = 0;
while (argstart < args.length && args[argstart].startsWith("-")) {
if ("-w".equals(args[argstart])) {
signWholeFile = true;
++argstart;
} else if ("-providerClass".equals(args[argstart])) {
if (argstart + 1 >= args.length) {
usage();
}
providerClass = args[++argstart];
++argstart;
} else if ("-a".equals(args[argstart])) {
alignment = Integer.parseInt(args[++argstart]);
++argstart;
} else {
usage();
}
}
if ((args.length - argstart) % 2 == 1) usage();
int numKeys = ((args.length - argstart) / 2) - 1;
if (signWholeFile && numKeys > 1) {
System.err.println("Only one key may be used with -w.");
System.exit(2);
}
loadProviderIfNecessary(providerClass);
String inputFilename = args[args.length-2];
String outputFilename = args[args.length-1];
JarFile inputJar = null;
FileOutputStream outputFile = null;
int hashes = 0;
try {
File firstPublicKeyFile = new File(args[argstart+0]);
X509Certificate[] publicKey = new X509Certificate[numKeys];
try {
for (int i = 0; i < numKeys; ++i) {
int argNum = argstart + i*2;
publicKey[i] = readPublicKey(new File(args[argNum]));
hashes |= getDigestAlgorithm(publicKey[i]);
}
} catch (IllegalArgumentException e) {
System.err.println(e);
System.exit(1);
}
// Set the ZIP file timestamp to the starting valid time
// of the 0th certificate plus one hour (to match what
// we've historically done).
long timestamp = publicKey[0].getNotBefore().getTime() + 3600L * 1000;
PrivateKey[] privateKey = new PrivateKey[numKeys];
for (int i = 0; i < numKeys; ++i) {
int argNum = argstart + i*2 + 1;
privateKey[i] = readPrivateKey(new File(args[argNum]));
}
inputJar = new JarFile(new File(inputFilename), false); // Don't verify.
outputFile = new FileOutputStream(outputFilename);
if (signWholeFile) {
SignApk.signWholeFile(inputJar, firstPublicKeyFile,
publicKey[0], privateKey[0], outputFile);
} else {
JarOutputStream outputJar = new JarOutputStream(outputFile);
// For signing .apks, use the maximum compression to make
// them as small as possible (since they live forever on
// the system partition). For OTA packages, use the
// default compression level, which is much much faster
// and produces output that is only a tiny bit larger
// (~0.1% on full OTA packages I tested).
outputJar.setLevel(9);
Manifest manifest = addDigestsToManifest(inputJar, hashes);
copyFiles(manifest, inputJar, outputJar, timestamp, alignment);
signFile(manifest, inputJar, publicKey, privateKey, outputJar);
outputJar.close();
}
} catch (Exception e) {
e.printStackTrace();
System.exit(1);
} finally {
try {
if (inputJar != null) inputJar.close();
if (outputFile != null) outputFile.close();
} catch (IOException e) {
e.printStackTrace();
System.exit(1);
}
}
}
}