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/*
* Copyright (C) 2014 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.verity;
import java.lang.reflect.Constructor;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.KeyFactory;
import java.security.Provider;
import java.security.Security;
import java.security.Signature;
import java.security.spec.X509EncodedKeySpec;
import java.security.spec.PKCS8EncodedKeySpec;
import org.bouncycastle.util.encoders.Base64;
public class Utils {
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);
}
static byte[] pemToDer(String pem) throws Exception {
pem = pem.replaceAll("^-.*", "");
String base64_der = pem.replaceAll("-.*$", "");
return Base64.decode(base64_der);
}
static PrivateKey loadDERPrivateKey(byte[] der) throws Exception {
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(der);
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
return (PrivateKey) keyFactory.generatePrivate(keySpec);
}
static PrivateKey loadPEMPrivateKey(byte[] pem) throws Exception {
byte[] der = pemToDer(new String(pem));
return loadDERPrivateKey(der);
}
static PrivateKey loadPEMPrivateKeyFromFile(String keyFname) throws Exception {
return loadPEMPrivateKey(read(keyFname));
}
static PrivateKey loadDERPrivateKeyFromFile(String keyFname) throws Exception {
return loadDERPrivateKey(read(keyFname));
}
static PublicKey loadDERPublicKey(byte[] der) throws Exception {
X509EncodedKeySpec publicKeySpec = new X509EncodedKeySpec(der);
KeyFactory factory = KeyFactory.getInstance("RSA");
return factory.generatePublic(publicKeySpec);
}
static PublicKey loadPEMPublicKey(byte[] pem) throws Exception {
byte[] der = pemToDer(new String(pem));
X509EncodedKeySpec publicKeySpec = new X509EncodedKeySpec(der);
KeyFactory factory = KeyFactory.getInstance("RSA");
return factory.generatePublic(publicKeySpec);
}
static PublicKey loadPEMPublicKeyFromFile(String keyFname) throws Exception {
return loadPEMPublicKey(read(keyFname));
}
static PublicKey loadDERPublicKeyFromFile(String keyFname) throws Exception {
return loadDERPublicKey(read(keyFname));
}
static byte[] sign(PrivateKey privateKey, byte[] input) throws Exception {
Signature signer = Signature.getInstance("SHA1withRSA");
signer.initSign(privateKey);
signer.update(input);
return signer.sign();
}
static byte[] read(String fname) throws Exception {
long offset = 0;
File f = new File(fname);
long length = f.length();
byte[] image = new byte[(int)length];
FileInputStream fis = new FileInputStream(f);
while (offset < length) {
offset += fis.read(image, (int)offset, (int)(length - offset));
}
fis.close();
return image;
}
static void write(byte[] data, String fname) throws Exception{
FileOutputStream out = new FileOutputStream(fname);
out.write(data);
out.close();
}
}
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