567 lines
24 KiB
Java
567 lines
24 KiB
Java
package com.topjohnwu;
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import org.bouncycastle.asn1.ASN1InputStream;
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import org.bouncycastle.asn1.ASN1ObjectIdentifier;
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import org.bouncycastle.asn1.DEROutputStream;
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import org.bouncycastle.asn1.cms.CMSObjectIdentifiers;
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import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
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import org.bouncycastle.cert.jcajce.JcaCertStore;
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import org.bouncycastle.cms.CMSException;
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import org.bouncycastle.cms.CMSProcessableByteArray;
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import org.bouncycastle.cms.CMSSignedData;
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import org.bouncycastle.cms.CMSSignedDataGenerator;
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import org.bouncycastle.cms.CMSTypedData;
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import org.bouncycastle.cms.jcajce.JcaSignerInfoGeneratorBuilder;
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import org.bouncycastle.jce.provider.BouncyCastleProvider;
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import org.bouncycastle.operator.ContentSigner;
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import org.bouncycastle.operator.OperatorCreationException;
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import org.bouncycastle.operator.jcajce.JcaContentSignerBuilder;
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import org.bouncycastle.operator.jcajce.JcaDigestCalculatorProviderBuilder;
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import org.bouncycastle.util.encoders.Base64;
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import java.io.ByteArrayInputStream;
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import java.io.ByteArrayOutputStream;
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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.OutputStream;
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import java.io.PrintStream;
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import java.security.DigestOutputStream;
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import java.security.GeneralSecurityException;
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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.Provider;
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import java.security.Security;
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import java.security.cert.CertificateEncodingException;
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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.PKCS8EncodedKeySpec;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Collections;
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import java.util.Enumeration;
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import java.util.Locale;
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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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import java.util.regex.Pattern;
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/*
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* Modified from from AOSP(Marshmallow) SignAPK.java
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* */
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public class ZipSigner {
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private static final String CERT_SF_NAME = "META-INF/CERT.SF";
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private static final String CERT_SIG_NAME = "META-INF/CERT.%s";
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private static Provider sBouncyCastleProvider;
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// bitmasks for which hash algorithms we need the manifest to include.
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private static final int USE_SHA1 = 1;
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private static final int USE_SHA256 = 2;
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/**
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* Return one of USE_SHA1 or USE_SHA256 according to the signature
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* algorithm specified in the cert.
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*/
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private static int getDigestAlgorithm(X509Certificate cert) {
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String sigAlg = cert.getSigAlgName().toUpperCase(Locale.US);
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if ("SHA1WITHRSA".equals(sigAlg) ||
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"MD5WITHRSA".equals(sigAlg)) { // see "HISTORICAL NOTE" above.
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return USE_SHA1;
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} else if (sigAlg.startsWith("SHA256WITH")) {
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return USE_SHA256;
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} else {
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throw new IllegalArgumentException("unsupported signature algorithm \"" + sigAlg +
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"\" in cert [" + cert.getSubjectDN());
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}
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}
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/** Returns the expected signature algorithm for this key type. */
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private static String getSignatureAlgorithm(X509Certificate cert) {
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String sigAlg = cert.getSigAlgName().toUpperCase(Locale.US);
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String keyType = cert.getPublicKey().getAlgorithm().toUpperCase(Locale.US);
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if ("RSA".equalsIgnoreCase(keyType)) {
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if (getDigestAlgorithm(cert) == USE_SHA256) {
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return "SHA256withRSA";
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} else {
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return "SHA1withRSA";
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}
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} else if ("EC".equalsIgnoreCase(keyType)) {
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return "SHA256withECDSA";
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} else {
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throw new IllegalArgumentException("unsupported key type: " + keyType);
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}
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}
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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|EC)|com/android/otacert))|(" +
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Pattern.quote(JarFile.MANIFEST_NAME) + ")$");
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private static X509Certificate readPublicKey(InputStream input)
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throws IOException, GeneralSecurityException {
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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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/** Read a PKCS#8 format private key. */
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private static PrivateKey readPrivateKey(InputStream input)
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throws IOException, GeneralSecurityException {
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try {
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byte[] buffer = new byte[4096];
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int size = input.read(buffer);
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byte[] bytes = Arrays.copyOf(buffer, size);
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/* Check to see if this is in an EncryptedPrivateKeyInfo structure. */
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PKCS8EncodedKeySpec spec = new PKCS8EncodedKeySpec(bytes);
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/*
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* Now it's in a PKCS#8 PrivateKeyInfo structure. Read its Algorithm
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* OID and use that to construct a KeyFactory.
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*/
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ASN1InputStream bIn = new ASN1InputStream(new ByteArrayInputStream(spec.getEncoded()));
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PrivateKeyInfo pki = PrivateKeyInfo.getInstance(bIn.readObject());
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String algOid = pki.getPrivateKeyAlgorithm().getAlgorithm().getId();
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return KeyFactory.getInstance(algOid).generatePrivate(spec);
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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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* Add the hash(es) of every file to the manifest, creating it if
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* necessary.
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*/
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private static Manifest addDigestsToManifest(JarFile jar, int hashes)
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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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MessageDigest md_sha1 = null;
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MessageDigest md_sha256 = null;
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if ((hashes & USE_SHA1) != 0) {
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md_sha1 = MessageDigest.getInstance("SHA1");
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}
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if ((hashes & USE_SHA256) != 0) {
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md_sha256 = MessageDigest.getInstance("SHA256");
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}
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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() &&
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(stripPattern == null || !stripPattern.matcher(name).matches())) {
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InputStream data = jar.getInputStream(entry);
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while ((num = data.read(buffer)) > 0) {
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if (md_sha1 != null) md_sha1.update(buffer, 0, num);
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if (md_sha256 != null) md_sha256.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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if (md_sha1 != null) {
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attr.putValue("SHA1-Digest",
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new String(Base64.encode(md_sha1.digest()), "ASCII"));
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}
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if (md_sha256 != null) {
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attr.putValue("SHA-256-Digest",
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new String(Base64.encode(md_sha256.digest()), "ASCII"));
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}
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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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/** Write to another stream and track how many bytes have been
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* written.
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*/
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private static class CountOutputStream extends FilterOutputStream {
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private int mCount;
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public CountOutputStream(OutputStream out) {
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super(out);
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mCount = 0;
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}
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@Override
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public void write(int b) throws IOException {
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super.write(b);
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mCount++;
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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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super.write(b, off, len);
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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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}
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}
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/** Write a .SF file with a digest of the specified manifest. */
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private static void writeSignatureFile(Manifest manifest, OutputStream out,
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int hash)
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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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MessageDigest md = MessageDigest.getInstance(
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hash == USE_SHA256 ? "SHA256" : "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(hash == USE_SHA256 ? "SHA-256-Digest-Manifest" : "SHA1-Digest-Manifest",
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new String(Base64.encode(md.digest()), "ASCII"));
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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(hash == USE_SHA256 ? "SHA-256-Digest" : "SHA1-Digest-Manifest",
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new String(Base64.encode(md.digest()), "ASCII"));
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sf.getEntries().put(entry.getKey(), sfAttr);
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}
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CountOutputStream cout = new CountOutputStream(out);
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sf.write(cout);
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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 ((cout.size() % 1024) == 0) {
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cout.write('\r');
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cout.write('\n');
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}
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}
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/** Sign data and write the digital signature to 'out'. */
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private static void writeSignatureBlock(
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CMSTypedData data, X509Certificate publicKey, PrivateKey privateKey,
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OutputStream out)
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throws IOException,
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CertificateEncodingException,
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OperatorCreationException,
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CMSException {
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ArrayList<X509Certificate> certList = new ArrayList<>(1);
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certList.add(publicKey);
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JcaCertStore certs = new JcaCertStore(certList);
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CMSSignedDataGenerator gen = new CMSSignedDataGenerator();
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ContentSigner signer = new JcaContentSignerBuilder(getSignatureAlgorithm(publicKey))
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.setProvider(sBouncyCastleProvider)
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.build(privateKey);
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gen.addSignerInfoGenerator(
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new JcaSignerInfoGeneratorBuilder(
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new JcaDigestCalculatorProviderBuilder()
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.setProvider(sBouncyCastleProvider)
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.build())
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.setDirectSignature(true)
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.build(signer, publicKey));
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gen.addCertificates(certs);
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CMSSignedData sigData = gen.generate(data, false);
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ASN1InputStream asn1 = new ASN1InputStream(sigData.getEncoded());
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DEROutputStream dos = new DEROutputStream(out);
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dos.writeObject(asn1.readObject());
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}
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/**
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* Copy all the files in a manifest from input to output. We set
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* the modification times in the output to a fixed time, so as to
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* reduce variation in the output file and make incremental OTAs
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* more efficient.
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*/
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private static void copyFiles(Manifest manifest, JarFile in, JarOutputStream out,
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long timestamp, int alignment) throws IOException {
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byte[] buffer = new byte[4096];
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int num;
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Map<String, Attributes> entries = manifest.getEntries();
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ArrayList<String> names = new ArrayList<String>(entries.keySet());
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Collections.sort(names);
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boolean firstEntry = true;
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long offset = 0L;
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// We do the copy in two passes -- first copying all the
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// entries that are STORED, then copying all the entries that
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// have any other compression flag (which in practice means
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// DEFLATED). This groups all the stored entries together at
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// the start of the file and makes it easier to do alignment
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// on them (since only stored entries are aligned).
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for (String name : names) {
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JarEntry inEntry = in.getJarEntry(name);
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JarEntry outEntry = null;
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if (inEntry.getMethod() != JarEntry.STORED) continue;
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// Preserve the STORED method of the input entry.
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outEntry = new JarEntry(inEntry);
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outEntry.setTime(timestamp);
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// 'offset' is the offset into the file at which we expect
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// the file data to begin. This is the value we need to
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// make a multiple of 'alignement'.
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offset += JarFile.LOCHDR + outEntry.getName().length();
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if (firstEntry) {
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// The first entry in a jar file has an extra field of
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// four bytes that you can't get rid of; any extra
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// data you specify in the JarEntry is appended to
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// these forced four bytes. This is JAR_MAGIC in
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// JarOutputStream; the bytes are 0xfeca0000.
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offset += 4;
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firstEntry = false;
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}
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if (alignment > 0 && (offset % alignment != 0)) {
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// Set the "extra data" of the entry to between 1 and
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// alignment-1 bytes, to make the file data begin at
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// an aligned offset.
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int needed = alignment - (int)(offset % alignment);
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outEntry.setExtra(new byte[needed]);
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offset += needed;
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}
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out.putNextEntry(outEntry);
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InputStream data = in.getInputStream(inEntry);
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while ((num = data.read(buffer)) > 0) {
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out.write(buffer, 0, num);
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offset += num;
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}
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out.flush();
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}
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// Copy all the non-STORED entries. We don't attempt to
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// maintain the 'offset' variable past this point; we don't do
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// alignment on these entries.
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for (String name : names) {
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JarEntry inEntry = in.getJarEntry(name);
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JarEntry outEntry = null;
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if (inEntry.getMethod() == JarEntry.STORED) continue;
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// Create a new entry so that the compressed len is recomputed.
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outEntry = new JarEntry(name);
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outEntry.setTime(timestamp);
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out.putNextEntry(outEntry);
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InputStream data = in.getInputStream(inEntry);
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while ((num = data.read(buffer)) > 0) {
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out.write(buffer, 0, num);
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}
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out.flush();
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}
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}
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// This class is to provide a file's content, but trimming out the last two bytes
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// Used for signWholeFile
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private static class CMSProcessableFile implements CMSTypedData {
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private File file;
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private ASN1ObjectIdentifier type;
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private byte[] buffer;
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int bufferSize = 0;
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CMSProcessableFile(File file) {
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this.file = file;
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type = new ASN1ObjectIdentifier(CMSObjectIdentifiers.data.getId());
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buffer = new byte[4096];
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}
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@Override
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public ASN1ObjectIdentifier getContentType() {
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return type;
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}
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@Override
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public void write(OutputStream out) throws IOException, CMSException {
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FileInputStream input = new FileInputStream(file);
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long len = file.length() - 2;
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while ((bufferSize = input.read(buffer)) > 0) {
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if (len <= bufferSize) {
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out.write(buffer, 0, (int) len);
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break;
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} else {
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out.write(buffer, 0, bufferSize);
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}
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len -= bufferSize;
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}
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}
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@Override
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public Object getContent() {
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return file;
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}
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byte[] getTail() {
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return Arrays.copyOfRange(buffer, 0, bufferSize);
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}
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}
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private static void signWholeFile(File input, X509Certificate publicKey,
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PrivateKey privateKey, OutputStream outputStream)
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throws Exception {
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ByteArrayOutputStream temp = new ByteArrayOutputStream();
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// put a readable message and a null char at the start of the
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// archive comment, so that tools that display the comment
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// (hopefully) show something sensible.
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// TODO: anything more useful we can put in this message?
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byte[] message = "signed by SignApk".getBytes("UTF-8");
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temp.write(message);
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temp.write(0);
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CMSProcessableFile cmsFile = new CMSProcessableFile(input);
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writeSignatureBlock(cmsFile, publicKey, privateKey, temp);
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// For a zip with no archive comment, the
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// end-of-central-directory record will be 22 bytes long, so
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// we expect to find the EOCD marker 22 bytes from the end.
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byte[] zipData = cmsFile.getTail();
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if (zipData[zipData.length-22] != 0x50 ||
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zipData[zipData.length-21] != 0x4b ||
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zipData[zipData.length-20] != 0x05 ||
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zipData[zipData.length-19] != 0x06) {
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throw new IllegalArgumentException("zip data already has an archive comment");
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}
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int total_size = temp.size() + 6;
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if (total_size > 0xffff) {
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throw new IllegalArgumentException("signature is too big for ZIP file comment");
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}
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// signature starts this many bytes from the end of the file
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int signature_start = total_size - message.length - 1;
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temp.write(signature_start & 0xff);
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temp.write((signature_start >> 8) & 0xff);
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// Why the 0xff bytes? In a zip file with no archive comment,
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// bytes [-6:-2] of the file are the little-endian offset from
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// the start of the file to the central directory. So for the
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// two high bytes to be 0xff 0xff, the archive would have to
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// be nearly 4GB in size. So it's unlikely that a real
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// commentless archive would have 0xffs here, and lets us tell
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// an old signed archive from a new one.
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temp.write(0xff);
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temp.write(0xff);
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temp.write(total_size & 0xff);
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temp.write((total_size >> 8) & 0xff);
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temp.flush();
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// Signature verification checks that the EOCD header is the
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// last such sequence in the file (to avoid minzip finding a
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// fake EOCD appended after the signature in its scan). The
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// odds of producing this sequence by chance are very low, but
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// let's catch it here if it does.
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byte[] b = temp.toByteArray();
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for (int i = 0; i < b.length-3; ++i) {
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if (b[i] == 0x50 && b[i+1] == 0x4b && b[i+2] == 0x05 && b[i+3] == 0x06) {
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|
throw new IllegalArgumentException("found spurious EOCD header at " + i);
|
|
}
|
|
}
|
|
cmsFile.write(outputStream);
|
|
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.getNotBefore().getTime() + 3600L * 1000;
|
|
// MANIFEST.MF
|
|
JarEntry je = new JarEntry(JarFile.MANIFEST_NAME);
|
|
je.setTime(timestamp);
|
|
outputJar.putNextEntry(je);
|
|
manifest.write(outputJar);
|
|
je = new JarEntry(CERT_SF_NAME);
|
|
je.setTime(timestamp);
|
|
outputJar.putNextEntry(je);
|
|
ByteArrayOutputStream baos = new ByteArrayOutputStream();
|
|
writeSignatureFile(manifest, baos, getDigestAlgorithm(publicKey));
|
|
byte[] signedData = baos.toByteArray();
|
|
outputJar.write(signedData);
|
|
// CERT.{EC,RSA} / CERT#.{EC,RSA}
|
|
final String keyType = publicKey.getPublicKey().getAlgorithm();
|
|
je = new JarEntry(String.format(CERT_SIG_NAME, keyType));
|
|
je.setTime(timestamp);
|
|
outputJar.putNextEntry(je);
|
|
writeSignatureBlock(new CMSProcessableByteArray(signedData),
|
|
publicKey, privateKey, outputJar);
|
|
}
|
|
|
|
public static void main(String[] args) {
|
|
boolean minSign = false;
|
|
int argStart = 0;
|
|
|
|
if (args.length < 4) {
|
|
System.err.println("Usage: zipsigner [-m] publickey.x509[.pem] privatekey.pk8 input.jar output.jar");
|
|
System.exit(2);
|
|
}
|
|
|
|
if (args[0].equals("-m")) {
|
|
minSign = true;
|
|
argStart = 1;
|
|
}
|
|
|
|
sBouncyCastleProvider = new BouncyCastleProvider();
|
|
Security.insertProviderAt(sBouncyCastleProvider, 1);
|
|
|
|
File pubKey = new File(args[argStart]);
|
|
File privKey = new File(args[argStart + 1]);
|
|
File input = new File(args[argStart + 2]);
|
|
File output = new File(args[argStart + 3]);
|
|
|
|
int alignment = 4;
|
|
JarFile inputJar = null;
|
|
FileOutputStream outputFile = null;
|
|
int hashes = 0;
|
|
try {
|
|
X509Certificate publicKey = readPublicKey(new FileInputStream(pubKey));
|
|
hashes |= getDigestAlgorithm(publicKey);
|
|
|
|
// 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.getNotBefore().getTime() + 3600L * 1000;
|
|
PrivateKey privateKey = readPrivateKey(new FileInputStream(privKey));
|
|
|
|
outputFile = new FileOutputStream(output);
|
|
if (minSign) {
|
|
ZipSigner.signWholeFile(input, publicKey, privateKey, outputFile);
|
|
} else {
|
|
inputJar = new JarFile(input, false); // Don't verify.
|
|
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);
|
|
}
|
|
}
|
|
}
|
|
} |