314 lines
10 KiB
Java
314 lines
10 KiB
Java
/*
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* Copyright 2014 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.signtos;
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import org.bouncycastle.asn1.ASN1InputStream;
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import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
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import org.bouncycastle.jce.provider.BouncyCastleProvider;
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import java.io.BufferedInputStream;
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import java.io.BufferedOutputStream;
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import java.io.BufferedReader;
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import java.io.ByteArrayInputStream;
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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.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.lang.reflect.Constructor;
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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.Provider;
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import java.security.PublicKey;
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import java.security.Security;
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import java.security.Signature;
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import java.security.interfaces.ECKey;
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import java.security.interfaces.ECPublicKey;
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import java.security.spec.InvalidKeySpecException;
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import java.security.spec.PKCS8EncodedKeySpec;
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import java.util.Arrays;
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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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* Signs Trusty images for use with operating systems that support it.
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*/
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public class SignTos {
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/** Size of the signature footer in bytes. */
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private static final int SIGNATURE_BLOCK_SIZE = 256;
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/** Current signature version code we use. */
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private static final int VERSION_CODE = 1;
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/** Size of the header on the file to skip. */
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private static final int HEADER_SIZE = 512;
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private static BouncyCastleProvider sBouncyCastleProvider;
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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 PKCS8EncodedKeySpec 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) throws IOException,
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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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/* Check to see if this is in an EncryptedPrivateKeyInfo structure. */
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PKCS8EncodedKeySpec 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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/*
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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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* Tries to load a JSE Provider by class name. This is for custom PrivateKey
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* types that might be stored in PKCS#11-like storage.
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*/
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private static void loadProviderIfNecessary(String providerClassName) {
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if (providerClassName == null) {
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return;
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}
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final Class<?> klass;
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try {
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final ClassLoader sysLoader = ClassLoader.getSystemClassLoader();
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if (sysLoader != null) {
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klass = sysLoader.loadClass(providerClassName);
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} else {
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klass = Class.forName(providerClassName);
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}
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} catch (ClassNotFoundException e) {
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e.printStackTrace();
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System.exit(1);
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return;
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}
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Constructor<?> constructor = null;
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for (Constructor<?> c : klass.getConstructors()) {
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if (c.getParameterTypes().length == 0) {
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constructor = c;
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break;
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}
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}
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if (constructor == null) {
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System.err.println("No zero-arg constructor found for " + providerClassName);
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System.exit(1);
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return;
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}
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final Object o;
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try {
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o = constructor.newInstance();
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} catch (Exception e) {
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e.printStackTrace();
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System.exit(1);
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return;
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}
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if (!(o instanceof Provider)) {
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System.err.println("Not a Provider class: " + providerClassName);
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System.exit(1);
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}
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Security.insertProviderAt((Provider) o, 1);
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}
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private static String getSignatureAlgorithm(Key key) {
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if ("EC".equals(key.getAlgorithm())) {
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ECKey ecKey = (ECKey) key;
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int curveSize = ecKey.getParams().getOrder().bitLength();
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if (curveSize <= 256) {
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return "SHA256withECDSA";
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} else if (curveSize <= 384) {
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return "SHA384withECDSA";
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} else {
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return "SHA512withECDSA";
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}
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} else {
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throw new IllegalArgumentException("Unsupported key type " + key.getAlgorithm());
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}
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}
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/**
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* @param inputFilename
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* @param outputFilename
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*/
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private static void signWholeFile(InputStream input, OutputStream output, PrivateKey signingKey)
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throws Exception {
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Signature sig = Signature.getInstance(getSignatureAlgorithm(signingKey));
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sig.initSign(signingKey);
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byte[] buffer = new byte[8192];
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/* Skip the header. */
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int skippedBytes = 0;
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while (skippedBytes != HEADER_SIZE) {
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int bytesRead = input.read(buffer, 0, HEADER_SIZE - skippedBytes);
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output.write(buffer, 0, bytesRead);
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skippedBytes += bytesRead;
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}
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int totalBytes = 0;
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for (;;) {
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int bytesRead = input.read(buffer);
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if (bytesRead == -1) {
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break;
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}
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totalBytes += bytesRead;
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sig.update(buffer, 0, bytesRead);
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output.write(buffer, 0, bytesRead);
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}
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byte[] sigBlock = new byte[SIGNATURE_BLOCK_SIZE];
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sigBlock[0] = VERSION_CODE;
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sig.sign(sigBlock, 1, sigBlock.length - 1);
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output.write(sigBlock);
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}
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private static void usage() {
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System.err.println("Usage: signtos " +
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"[-providerClass <className>] " +
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" privatekey.pk8 " +
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"input.img output.img");
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System.exit(2);
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}
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public static void main(String[] args) throws Exception {
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if (args.length < 3) {
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usage();
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}
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String providerClass = null;
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String providerArg = null;
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int argstart = 0;
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while (argstart < args.length && args[argstart].startsWith("-")) {
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if ("-providerClass".equals(args[argstart])) {
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if (argstart + 1 >= args.length) {
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usage();
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}
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providerClass = args[++argstart];
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++argstart;
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} else {
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usage();
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}
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}
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/*
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* Should only be "<privatekey> <input> <output>" left.
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*/
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if (argstart != args.length - 3) {
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usage();
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}
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sBouncyCastleProvider = new BouncyCastleProvider();
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Security.addProvider(sBouncyCastleProvider);
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loadProviderIfNecessary(providerClass);
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String keyFilename = args[args.length - 3];
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String inputFilename = args[args.length - 2];
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String outputFilename = args[args.length - 1];
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PrivateKey privateKey = readPrivateKey(new File(keyFilename));
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InputStream input = new BufferedInputStream(new FileInputStream(inputFilename));
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OutputStream output = new BufferedOutputStream(new FileOutputStream(outputFilename));
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try {
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SignTos.signWholeFile(input, output, privateKey);
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} finally {
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input.close();
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output.close();
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}
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System.out.println("Successfully signed: " + outputFilename);
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}
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}
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