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/*
* Copyright (C) 2013 Dominik Schürmann <dominik@dominikschuermann.de>
*
* 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 org.sufficientlysecure.keychain.crypto_provider;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import org.sufficientlysecure.keychain.Constants;
import org.sufficientlysecure.keychain.Id;
import org.sufficientlysecure.keychain.helper.PgpMain;
import org.sufficientlysecure.keychain.util.InputData;
import org.sufficientlysecure.keychain.util.Log;
import org.sufficientlysecure.keychain.R;
import org.sufficientlysecure.keychain.service.KeychainIntentService;
import org.sufficientlysecure.keychain.service.PassphraseCacheService;
import com.android.crypto.CryptoError;
import com.android.crypto.ICryptoCallback;
import com.android.crypto.ICryptoService;
import com.android.crypto.CryptoSignatureResult;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.os.IBinder;
import android.os.RemoteException;
public class CryptoService extends Service {
Context mContext;
@Override
public void onCreate() {
super.onCreate();
mContext = this;
Log.d(Constants.TAG, "CryptoService, onCreate()");
}
@Override
public void onDestroy() {
super.onDestroy();
Log.d(Constants.TAG, "CryptoService, onDestroy()");
}
@Override
public IBinder onBind(Intent intent) {
return mBinder;
}
private synchronized void decryptAndVerifySafe(byte[] inputBytes, ICryptoCallback callback)
throws RemoteException {
try {
// build InputData and write into OutputStream
InputStream inputStream = new ByteArrayInputStream(inputBytes);
long inputLength = inputBytes.length;
InputData inputData = new InputData(inputStream, inputLength);
OutputStream outputStream = new ByteArrayOutputStream();
long secretKeyId = PgpMain.getDecryptionKeyId(mContext, inputStream);
if (secretKeyId == Id.key.none) {
throw new PgpMain.PgpGeneralException(getString(R.string.error_noSecretKeyFound));
}
Log.d(Constants.TAG, "secretKeyId " + secretKeyId);
String passphrase = PassphraseCacheService.getCachedPassphrase(mContext, secretKeyId);
if (passphrase == null) {
Log.d(Constants.TAG, "No passphrase! Activity required!");
// No passphrase cached for this ciphertext! Intent required to cache
// passphrase!
Intent intent = new Intent(CryptoActivity.ACTION_CACHE_PASSPHRASE);
intent.putExtra(CryptoActivity.EXTRA_SECRET_KEY_ID, secretKeyId);
callback.onActivityRequired(intent);
return;
}
// if (signedOnly) {
// resultData = PgpMain.verifyText(this, this, inputData, outStream,
// lookupUnknownKey);
// } else {
// resultData = PgpMain.decryptAndVerify(this, this, inputData, outStream,
// PassphraseCacheService.getCachedPassphrase(this, secretKeyId),
// assumeSymmetricEncryption);
// }
Bundle outputBundle = PgpMain.decryptAndVerify(mContext, null, inputData, outputStream,
passphrase, false);
outputStream.close();
byte[] outputBytes = ((ByteArrayOutputStream) outputStream).toByteArray();
// get signature informations from bundle
boolean signature = outputBundle.getBoolean(KeychainIntentService.RESULT_SIGNATURE);
long signatureKeyId = outputBundle
.getLong(KeychainIntentService.RESULT_SIGNATURE_KEY_ID);
String signatureUserId = outputBundle
.getString(KeychainIntentService.RESULT_SIGNATURE_USER_ID);
boolean signatureSuccess = outputBundle
.getBoolean(KeychainIntentService.RESULT_SIGNATURE_SUCCESS);
boolean signatureUnknown = outputBundle
.getBoolean(KeychainIntentService.RESULT_SIGNATURE_UNKNOWN);
CryptoSignatureResult sigResult = new CryptoSignatureResult(signatureUserId, signature,
signatureSuccess, signatureUnknown);
// return over handler on client side
callback.onDecryptVerifySuccess(outputBytes, sigResult);
} catch (Exception e) {
Log.e(Constants.TAG, "KeychainService, Exception!", e);
try {
callback.onError(new CryptoError(0, e.getMessage()));
} catch (Exception t) {
Log.e(Constants.TAG, "Error returning exception to client", t);
}
}
}
private final ICryptoService.Stub mBinder = new ICryptoService.Stub() {
@Override
public void encrypt(byte[] inputBytes, String[] encryptionUserIds, ICryptoCallback callback)
throws RemoteException {
// TODO Auto-generated method stub
}
@Override
public void encryptAndSign(byte[] inputBytes, String[] encryptionUserIds,
String signatureUserId, ICryptoCallback callback) throws RemoteException {
// TODO Auto-generated method stub
}
@Override
public void sign(byte[] inputBytes, String signatureUserId, ICryptoCallback callback)
throws RemoteException {
// TODO Auto-generated method stub
}
@Override
public void decryptAndVerify(byte[] inputBytes, ICryptoCallback callback)
throws RemoteException {
decryptAndVerifySafe(inputBytes, callback);
}
};
// /**
// * As we can not throw an exception through Android RPC, we assign identifiers to the
// exception
// * types.
// *
// * @param e
// * @return
// */
// private int getExceptionId(Exception e) {
// if (e instanceof NoSuchProviderException) {
// return 0;
// } else if (e instanceof NoSuchAlgorithmException) {
// return 1;
// } else if (e instanceof SignatureException) {
// return 2;
// } else if (e instanceof IOException) {
// return 3;
// } else if (e instanceof PgpGeneralException) {
// return 4;
// } else if (e instanceof PGPException) {
// return 5;
// } else {
// return -1;
// }
// }
}
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