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/*
* Copyright (C) 2012 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.thialfihar.android.apg.service;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.SignatureException;
import org.spongycastle.openpgp.PGPException;
import org.thialfihar.android.apg.Constants;
import org.thialfihar.android.apg.Id;
import org.thialfihar.android.apg.R;
import org.thialfihar.android.apg.helper.PGPMain;
import org.thialfihar.android.apg.helper.PGPMain.ApgGeneralException;
import org.thialfihar.android.apg.util.InputData;
import org.thialfihar.android.apg.util.Log;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.os.IBinder;
import android.os.RemoteException;
/**
* TODO:
*
* - is this service thread safe? Probably not!
*
*/
public class ApgService extends Service {
Context mContext;
@Override
public void onCreate() {
super.onCreate();
mContext = this;
Log.d(Constants.TAG, "ApgService, onCreate()");
}
@Override
public void onDestroy() {
super.onDestroy();
Log.d(Constants.TAG, "ApgService, onDestroy()");
}
@Override
public IBinder onBind(Intent intent) {
return mBinder;
}
private static void writeToOutputStream(InputStream is, OutputStream os) throws IOException {
byte[] buffer = new byte[8];
int len = 0;
while ((len = is.read(buffer)) != -1) {
os.write(buffer, 0, len);
}
}
void encryptAndSignImplementation(byte[] inputBytes, String inputUri, boolean useAsciiArmor,
int compression, long[] encryptionKeyIds, String encryptionPassphrase,
int symmetricEncryptionAlgorithm, long signatureKeyId, int signatureHashAlgorithm,
boolean signatureForceV3, String signaturePassphrase, IApgEncryptDecryptHandler handler)
throws RemoteException {
try {
// TODO use inputUri
// InputStream inStream = null;
// if (isBlob) {
// ContentResolver cr = getContentResolver();
// try {
// inStream = cr.openInputStream(Uri.parse(pArgs.getString(arg.BLOB.name())));
// } catch (Exception e) {
// Log.e(TAG, "... exception on opening blob", e);
// }
// } else {
// inStream = new ByteArrayInputStream(pArgs.getString(arg.MESSAGE.name()).getBytes());
// }
// InputData in = new InputData(inStream, 0); // XXX Size second param?
// build InputData and write into OutputStream
InputStream inputStream = new ByteArrayInputStream(inputBytes);
long inputLength = inputBytes.length;
InputData input = new InputData(inputStream, inputLength);
OutputStream output = new ByteArrayOutputStream();
PGPMain.encryptAndSign(mContext, null, input, output, useAsciiArmor, compression,
encryptionKeyIds, encryptionPassphrase, symmetricEncryptionAlgorithm,
signatureKeyId, signatureHashAlgorithm, signatureForceV3, signaturePassphrase);
output.close();
// if (isBlob) {
// ContentResolver cr = getContentResolver();
// try {
// OutputStream outStream = cr.openOutputStream(Uri.parse(pArgs.getString(arg.BLOB
// .name())));
// writeToOutputStream(new ByteArrayInputStream(out.toString().getBytes()), outStream);
// outStream.close();
// } catch (Exception e) {
// Log.e(TAG, "... exception on writing blob", e);
// }
// } else {
// pReturn.putString(ret.RESULT.name(), out.toString());
// }
byte[] outputBytes = ((ByteArrayOutputStream) output).toByteArray();
// return over handler on client side
handler.onSuccessEncrypt(outputBytes, null);
} catch (Exception e) {
Log.e(Constants.TAG, "ApgService, Exception!", e);
try {
handler.onException(getExceptionId(e), e.getMessage());
} catch (Exception t) {
Log.e(Constants.TAG, "Error returning exception to client", t);
}
}
}
public void decryptAndVerifyImplementation(byte[] inputBytes, String inputUri,
String passphrase, boolean assumeSymmetric, IApgEncryptDecryptHandler handler)
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();
Bundle outputBundle = PGPMain.decryptAndVerify(mContext, null, inputData, outputStream,
passphrase, assumeSymmetric);
outputStream.close();
byte[] outputBytes = ((ByteArrayOutputStream) outputStream).toByteArray();
// get signature informations from bundle
boolean signature = outputBundle.getBoolean(ApgIntentService.RESULT_SIGNATURE);
long signatureKeyId = outputBundle.getLong(ApgIntentService.RESULT_SIGNATURE_KEY_ID);
String signatureUserId = outputBundle
.getString(ApgIntentService.RESULT_SIGNATURE_USER_ID);
boolean signatureSuccess = outputBundle
.getBoolean(ApgIntentService.RESULT_SIGNATURE_SUCCESS);
boolean signatureUnknown = outputBundle
.getBoolean(ApgIntentService.RESULT_SIGNATURE_UNKNOWN);
// return over handler on client side
handler.onSuccessDecrypt(outputBytes, null, signature, signatureKeyId, signatureUserId,
signatureSuccess, signatureUnknown);
} catch (Exception e) {
Log.e(Constants.TAG, "ApgService, Exception!", e);
try {
handler.onException(getExceptionId(e), e.getMessage());
} catch (Exception t) {
Log.e(Constants.TAG, "Error returning exception to client", t);
}
}
}
private void getDecryptionKeyImplementation(byte[] inputBytes, String inputUri,
IApgHelperHandler handler) {
// TODO: implement inputUri
try {
InputStream inputStream = new ByteArrayInputStream(inputBytes);
long secretKeyId = Id.key.none;
boolean symmetric;
try {
secretKeyId = PGPMain.getDecryptionKeyId(ApgService.this, inputStream);
if (secretKeyId == Id.key.none) {
throw new ApgGeneralException(getString(R.string.error_noSecretKeyFound));
}
symmetric = false;
} catch (PGPMain.NoAsymmetricEncryptionException e) {
secretKeyId = Id.key.symmetric;
if (!PGPMain.hasSymmetricEncryption(ApgService.this, inputStream)) {
throw new ApgGeneralException(getString(R.string.error_noKnownEncryptionFound));
}
symmetric = true;
}
handler.onSuccessGetDecryptionKey(secretKeyId, symmetric);
} catch (Exception e) {
Log.e(Constants.TAG, "ApgService, Exception!", e);
try {
handler.onException(getExceptionId(e), e.getMessage());
} catch (Exception t) {
Log.e(Constants.TAG, "Error returning exception to client", t);
}
}
}
/**
* This is the implementation of the interface IApgService. All methods are oneway, meaning
* asynchronous and return to the client using IApgHandler.
*
* The real PGP code is located in PGPMain.
*/
private final IApgService.Stub mBinder = new IApgService.Stub() {
@Override
public void encryptAsymmetric(byte[] inputBytes, String inputUri, boolean useAsciiArmor,
int compression, long[] encryptionKeyIds, int symmetricEncryptionAlgorithm,
IApgEncryptDecryptHandler handler) throws RemoteException {
encryptAndSignImplementation(inputBytes, inputUri, useAsciiArmor, compression,
encryptionKeyIds, null, symmetricEncryptionAlgorithm, Id.key.none, 0, false,
null, handler);
}
@Override
public void encryptSymmetric(byte[] inputBytes, String inputUri, boolean useAsciiArmor,
int compression, String encryptionPassphrase, int symmetricEncryptionAlgorithm,
IApgEncryptDecryptHandler handler) throws RemoteException {
encryptAndSignImplementation(inputBytes, inputUri, useAsciiArmor, compression, null,
encryptionPassphrase, symmetricEncryptionAlgorithm, Id.key.none, 0, false,
null, handler);
}
@Override
public void encryptAndSignAsymmetric(byte[] inputBytes, String inputUri,
boolean useAsciiArmor, int compression, long[] encryptionKeyIds,
int symmetricEncryptionAlgorithm, long signatureKeyId, int signatureHashAlgorithm,
boolean signatureForceV3, String signaturePassphrase,
IApgEncryptDecryptHandler handler) throws RemoteException {
encryptAndSignImplementation(inputBytes, inputUri, useAsciiArmor, compression,
encryptionKeyIds, null, symmetricEncryptionAlgorithm, signatureKeyId,
signatureHashAlgorithm, signatureForceV3, signaturePassphrase, handler);
}
@Override
public void encryptAndSignSymmetric(byte[] inputBytes, String inputUri,
boolean useAsciiArmor, int compression, String encryptionPassphrase,
int symmetricEncryptionAlgorithm, long signatureKeyId, int signatureHashAlgorithm,
boolean signatureForceV3, String signaturePassphrase,
IApgEncryptDecryptHandler handler) throws RemoteException {
encryptAndSignImplementation(inputBytes, inputUri, useAsciiArmor, compression, null,
encryptionPassphrase, symmetricEncryptionAlgorithm, signatureKeyId,
signatureHashAlgorithm, signatureForceV3, signaturePassphrase, handler);
}
@Override
public void decryptAndVerifyAsymmetric(byte[] inputBytes, String inputUri,
String keyPassphrase, IApgEncryptDecryptHandler handler) throws RemoteException {
decryptAndVerifyImplementation(inputBytes, inputUri, keyPassphrase, false, handler);
}
@Override
public void decryptAndVerifySymmetric(byte[] inputBytes, String inputUri,
String encryptionPassphrase, IApgEncryptDecryptHandler handler)
throws RemoteException {
decryptAndVerifyImplementation(inputBytes, inputUri, encryptionPassphrase, true,
handler);
}
@Override
public void getDecryptionKey(byte[] inputBytes, String inputUri, IApgHelperHandler handler)
throws RemoteException {
getDecryptionKeyImplementation(inputBytes, inputUri, handler);
}
};
/**
* 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 ApgGeneralException) {
return 4;
} else if (e instanceof PGPException) {
return 5;
} else {
return -1;
}
}
}
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