merge k9mail back into master

26 files changed, 1650 insertions, 476 deletions

diff --git a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/Id.java b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/Id.java
index 382f144d7..b0d60cf94 100644
--- a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/Id.java
+++ b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/Id.java
@@ -62,6 +62,7 @@ public final class Id {
             public static final int import_from_file = 0x21070020;
             public static final int import_from_qr_code = 0x21070021;
             public static final int import_from_nfc = 0x21070022;
+            public static final int crypto_consumers = 0x21070023;
         }
     }
 
diff --git a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/crypto_provider/CryptoActivity.java b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/crypto_provider/CryptoActivity.java
deleted file mode 100644
index b1d248e42..000000000
--- a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/crypto_provider/CryptoActivity.java
+++ /dev/null
@@ -1,92 +0,0 @@
-package org.sufficientlysecure.keychain.crypto_provider;
-
-import org.sufficientlysecure.keychain.Constants;
-import org.sufficientlysecure.keychain.Id;
-import org.sufficientlysecure.keychain.R;
-import org.sufficientlysecure.keychain.helper.PgpMain;
-import org.sufficientlysecure.keychain.provider.ProviderHelper;
-import org.sufficientlysecure.keychain.ui.dialog.PassphraseDialogFragment;
-import org.sufficientlysecure.keychain.util.Log;
-
-import com.actionbarsherlock.app.SherlockFragmentActivity;
-
-import android.app.Activity;
-import android.content.Intent;
-import android.os.Bundle;
-import android.os.Handler;
-import android.os.Message;
-import android.os.Messenger;
-import android.view.View;
-import android.view.View.OnClickListener;
-import android.widget.Button;
-
-public class CryptoActivity extends SherlockFragmentActivity {
-
-    public static final String ACTION_CACHE_PASSPHRASE = "org.sufficientlysecure.keychain.CRYPTO_CACHE_PASSPHRASE";
-
-    public static final String EXTRA_SECRET_KEY_ID = "secret_key_id";
-
-    @Override
-    protected void onCreate(Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
-
-        handleActions(getIntent());
-    }
-
-    protected void handleActions(Intent intent) {
-
-        // TODO: Important: Check if calling package is in list!
-
-        String action = intent.getAction();
-        Bundle extras = intent.getExtras();
-
-        if (extras == null) {
-            extras = new Bundle();
-        }
-
-        /**
-         * com.android.crypto actions
-         */
-        if (ACTION_CACHE_PASSPHRASE.equals(action)) {
-            long secretKeyId = extras.getLong(EXTRA_SECRET_KEY_ID);
-
-            showPassphraseDialog(secretKeyId);
-        } else {
-            Log.e(Constants.TAG, "Wrong action!");
-            setResult(RESULT_CANCELED);
-            finish();
-        }
-    }
-
-    /**
-     * Shows passphrase dialog to cache a new passphrase the user enters for using it later for
-     * encryption. Based on mSecretKeyId it asks for a passphrase to open a private key or it asks
-     * for a symmetric passphrase
-     */
-    private void showPassphraseDialog(long secretKeyId) {
-        // Message is received after passphrase is cached
-        Handler returnHandler = new Handler() {
-            @Override
-            public void handleMessage(Message message) {
-                if (message.what == PassphraseDialogFragment.MESSAGE_OKAY) {
-                    setResult(RESULT_OK);
-                    finish();
-                }
-            }
-        };
-
-        // Create a new Messenger for the communication back
-        Messenger messenger = new Messenger(returnHandler);
-
-        try {
-            PassphraseDialogFragment passphraseDialog = PassphraseDialogFragment.newInstance(this,
-                    messenger, secretKeyId);
-
-            passphraseDialog.show(getSupportFragmentManager(), "passphraseDialog");
-        } catch (PgpMain.PgpGeneralException e) {
-            Log.d(Constants.TAG, "No passphrase for this secret key, encrypt directly!");
-            // send message to handler to start encryption directly
-            returnHandler.sendEmptyMessage(PassphraseDialogFragment.MESSAGE_OKAY);
-        }
-    }
-}
diff --git a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/crypto_provider/CryptoService.java b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/crypto_provider/CryptoService.java
deleted file mode 100644
index 1a57a457d..000000000
--- a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/crypto_provider/CryptoService.java
+++ /dev/null
@@ -1,196 +0,0 @@
-/*
- * 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, "Got input:\n"+new String(inputBytes));
-
-            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;
-    // }
-    // }
-
-}
diff --git a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/crypto_provider/RegisterActivity.java b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/crypto_provider/RegisterActivity.java
deleted file mode 100644
index 39b29f9a0..000000000
--- a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/crypto_provider/RegisterActivity.java
+++ /dev/null
@@ -1,74 +0,0 @@
-package org.sufficientlysecure.keychain.crypto_provider;
-
-import org.sufficientlysecure.keychain.Constants;
-import org.sufficientlysecure.keychain.R;
-import org.sufficientlysecure.keychain.provider.ProviderHelper;
-import org.sufficientlysecure.keychain.util.Log;
-
-import android.app.Activity;
-import android.content.Intent;
-import android.os.Bundle;
-import android.view.View;
-import android.view.View.OnClickListener;
-import android.widget.Button;
-
-public class RegisterActivity extends Activity {
-
-    public static final String ACTION_REGISTER = "com.android.crypto.REGISTER";
-
-    public static final String EXTRA_PACKAGE_NAME = "packageName";
-
-    @Override
-    protected void onCreate(Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
-
-        handleActions(getIntent());
-    }
-
-    protected void handleActions(Intent intent) {
-        String action = intent.getAction();
-        Bundle extras = intent.getExtras();
-
-        if (extras == null) {
-            extras = new Bundle();
-        }
-
-        final String callingPackageName = this.getCallingPackage();
-
-        /**
-         * com.android.crypto actions
-         */
-        if (ACTION_REGISTER.equals(action)) {
-            setContentView(R.layout.register_crypto_consumer_activity);
-
-            Button allowButton = (Button) findViewById(R.id.register_crypto_consumer_allow);
-            Button disallowButton = (Button) findViewById(R.id.register_crypto_consumer_disallow);
-
-            allowButton.setOnClickListener(new OnClickListener() {
-
-                @Override
-                public void onClick(View v) {
-                    ProviderHelper.addCryptoConsumer(RegisterActivity.this, callingPackageName);
-                    Intent data = new Intent();
-                    data.putExtra(EXTRA_PACKAGE_NAME, "org.sufficientlysecure.keychain");
-
-                    setResult(RESULT_OK, data);
-                    finish();
-                }
-            });
-
-            disallowButton.setOnClickListener(new OnClickListener() {
-
-                @Override
-                public void onClick(View v) {
-                    setResult(RESULT_CANCELED);
-                    finish();
-                }
-            });
-
-        } else {
-            Log.e(Constants.TAG, "Please use com.android.crypto.REGISTER as intent action!");
-            finish();
-        }
-    }
-}
diff --git a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/helper/OtherHelper.java b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/helper/OtherHelper.java
index 6a71ca0ba..5dc561923 100644
--- a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/helper/OtherHelper.java
+++ b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/helper/OtherHelper.java
@@ -120,28 +120,33 @@ public class OtherHelper {
     public static void checkPackagePermissionForActions(Activity activity, String pkgName,
             String permName, String action, String[] restrictedActions) {
         if (action != null) {
-            PackageManager pkgManager = activity.getPackageManager();
-
-            for (int i = 0; i < restrictedActions.length; i++) {
-                if (restrictedActions[i].equals(action)) {
-                    if (pkgName != null
-                            && (pkgManager.checkPermission(permName, pkgName) == PackageManager.PERMISSION_GRANTED || pkgName
-                                    .equals(Constants.PACKAGE_NAME))) {
-                        Log.d(Constants.TAG, pkgName + " has permission " + permName + ". Action "
-                                + action + " was granted!");
-                    } else {
-                        String error = pkgName + " does NOT have permission " + permName
-                                + ". Action " + action + " was NOT granted!";
-                        Log.e(Constants.TAG, error);
-                        Toast.makeText(activity, activity.getString(R.string.errorMessage, error),
-                                Toast.LENGTH_LONG).show();
-
-                        // end activity
-                        activity.setResult(Activity.RESULT_CANCELED, null);
-                        activity.finish();
-                    }
-                }
-            }
+//            PackageManager pkgManager = activity.getPackageManager();
+
+//            for (int i = 0; i < restrictedActions.length; i++) {
+//                if (restrictedActions[i].equals(action)) {
+//                    if (pkgName != null
+//                            && (pkgManager.checkPermission(permName, pkgName) == PackageManager.PERMISSION_GRANTED || pkgName
+//                                    .equals(Constants.PACKAGE_NAME))) {
+//                        Log.d(Constants.TAG, pkgName + " has permission " + permName + ". Action "
+//                                + action + " was granted!");
+//                    } else {
+//                        String error = pkgName + " does NOT have permission " + permName
+//                                + ". Action " + action + " was NOT granted!";
+//                        Log.e(Constants.TAG, error);
+//                        Toast.makeText(activity, activity.getString(R.string.errorMessage, error),
+//                                Toast.LENGTH_LONG).show();
+//
+//                        // end activity
+//                        activity.setResult(Activity.RESULT_CANCELED, null);
+//                        activity.finish();
+//                    }
+//                }
+//            }
+            
+            // TODO: currently always cancels! THis is the old API
+            // end activity
+            activity.setResult(Activity.RESULT_CANCELED, null);
+            activity.finish();
         }
     }
 
diff --git a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/provider/KeychainContract.java b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/provider/KeychainContract.java
index 46928c6fa..93ee50a5e 100644
--- a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/provider/KeychainContract.java
+++ b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/provider/KeychainContract.java
@@ -43,7 +43,7 @@ public class KeychainContract {
         String CREATION = "creation";
         String EXPIRY = "expiry";
         String KEY_RING_ROW_ID = "key_ring_row_id"; // foreign key to key_rings._ID
-        String KEY_DATA = "key_data"; // PGPPublicKey / PGPSecretKey blob
+        String KEY_DATA = "key_data"; // PGPPublicKey/PGPSecretKey blob
         String RANK = "rank";
     }
 
@@ -53,8 +53,13 @@ public class KeychainContract {
         String RANK = "rank";
     }
 
-    interface CryptoConsumersColumns {
+    interface ApiAppsColumns {
         String PACKAGE_NAME = "package_name";
+        String KEY_ID = "key_id"; // not a database id
+        String ASCII_ARMOR = "ascii_armor";
+        String ENCRYPTION_ALGORITHM = "encryption_algorithm";
+        String HASH_ALORITHM = "hash_algorithm";
+        String COMPRESSION = "compression";
     }
 
     public static final class KeyTypes {
@@ -82,7 +87,8 @@ public class KeychainContract {
     public static final String PATH_USER_IDS = "user_ids";
     public static final String PATH_KEYS = "keys";
 
-    public static final String BASE_CRYPTO_CONSUMERS = "crypto_consumers";
+    public static final String BASE_API_APPS = "api_apps";
+    public static final String PATH_BY_PACKAGE_NAME = "package_name";
 
     public static class KeyRings implements KeyRingsColumns, BaseColumns {
         public static final Uri CONTENT_URI = BASE_CONTENT_URI_INTERNAL.buildUpon()
@@ -213,15 +219,24 @@ public class KeychainContract {
         }
     }
 
-    public static class CryptoConsumers implements CryptoConsumersColumns, BaseColumns {
+    public static class ApiApps implements ApiAppsColumns, BaseColumns {
         public static final Uri CONTENT_URI = BASE_CONTENT_URI_INTERNAL.buildUpon()
-                .appendPath(BASE_CRYPTO_CONSUMERS).build();
+                .appendPath(BASE_API_APPS).build();
 
         /** Use if multiple items get returned */
-        public static final String CONTENT_TYPE = "vnd.android.cursor.dir/vnd.thialfihar.apg.crypto_consumers";
+        public static final String CONTENT_TYPE = "vnd.android.cursor.dir/vnd.thialfihar.apg.api_apps";
 
         /** Use if a single item is returned */
-        public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/vnd.thialfihar.apg.crypto_consumers";
+        public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/vnd.thialfihar.apg.api_apps";
+
+        public static Uri buildIdUri(String rowId) {
+            return CONTENT_URI.buildUpon().appendPath(rowId).build();
+        }
+
+        public static Uri buildByPackageNameUri(String packageName) {
+            return CONTENT_URI.buildUpon().appendPath(PATH_BY_PACKAGE_NAME).appendPath(packageName)
+                    .build();
+        }
     }
 
     public static class DataStream {
diff --git a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/provider/KeychainDatabase.java b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/provider/KeychainDatabase.java
index f30292b52..6da96f45f 100644
--- a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/provider/KeychainDatabase.java
+++ b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/provider/KeychainDatabase.java
@@ -18,7 +18,7 @@
 package org.sufficientlysecure.keychain.provider;
 
 import org.sufficientlysecure.keychain.Constants;
-import org.sufficientlysecure.keychain.provider.KeychainContract.CryptoConsumersColumns;
+import org.sufficientlysecure.keychain.provider.KeychainContract.ApiAppsColumns;
 import org.sufficientlysecure.keychain.provider.KeychainContract.KeyRingsColumns;
 import org.sufficientlysecure.keychain.provider.KeychainContract.KeysColumns;
 import org.sufficientlysecure.keychain.provider.KeychainContract.UserIdsColumns;
@@ -37,7 +37,7 @@ public class KeychainDatabase extends SQLiteOpenHelper {
         String KEY_RINGS = "key_rings";
         String KEYS = "keys";
         String USER_IDS = "user_ids";
-        String CRYPTO_CONSUMERS = "crypto_consumers";
+        String API_APPS = "api_apps";
     }
 
     private static final String CREATE_KEY_RINGS = "CREATE TABLE IF NOT EXISTS " + Tables.KEY_RINGS
@@ -64,10 +64,14 @@ public class KeychainDatabase extends SQLiteOpenHelper {
             + UserIdsColumns.KEY_RING_ROW_ID + ") REFERENCES " + Tables.KEY_RINGS + "("
             + BaseColumns._ID + ") ON DELETE CASCADE)";
 
-    private static final String CREATE_CRYPTO_CONSUMERS = "CREATE TABLE IF NOT EXISTS "
-            + Tables.CRYPTO_CONSUMERS + " (" + BaseColumns._ID
-            + " INTEGER PRIMARY KEY AUTOINCREMENT, " + CryptoConsumersColumns.PACKAGE_NAME
-            + " TEXT UNIQUE)";
+    private static final String CREATE_API_APPS = "CREATE TABLE IF NOT EXISTS "
+            + Tables.API_APPS + " (" + BaseColumns._ID
+            + " INTEGER PRIMARY KEY AUTOINCREMENT, " + ApiAppsColumns.PACKAGE_NAME
+            + " TEXT UNIQUE, " + ApiAppsColumns.KEY_ID + " INT64, "
+            + ApiAppsColumns.ASCII_ARMOR + " INTEGER, "
+            + ApiAppsColumns.ENCRYPTION_ALGORITHM + " INTEGER, "
+            + ApiAppsColumns.HASH_ALORITHM + " INTEGER, "
+            + ApiAppsColumns.COMPRESSION + " INTEGER)";
 
     KeychainDatabase(Context context) {
         super(context, DATABASE_NAME, null, DATABASE_VERSION);
@@ -80,7 +84,7 @@ public class KeychainDatabase extends SQLiteOpenHelper {
         db.execSQL(CREATE_KEY_RINGS);
         db.execSQL(CREATE_KEYS);
         db.execSQL(CREATE_USER_IDS);
-        db.execSQL(CREATE_CRYPTO_CONSUMERS);
+        db.execSQL(CREATE_API_APPS);
     }
 
     @Override
@@ -108,7 +112,7 @@ public class KeychainDatabase extends SQLiteOpenHelper {
                         + " = 1 WHERE " + KeysColumns.IS_MASTER_KEY + "= 1;");
                 break;
             case 4:
-                db.execSQL(CREATE_CRYPTO_CONSUMERS);
+                db.execSQL(CREATE_API_APPS);
 
             default:
                 break;
diff --git a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/provider/KeychainProvider.java b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/provider/KeychainProvider.java
index 49286b9ce..edb82e632 100644
--- a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/provider/KeychainProvider.java
+++ b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/provider/KeychainProvider.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2012 Dominik Schürmann <dominik@dominikschuermann.de>
+ * Copyright (C) 2012-2013 Dominik Schürmann <dominik@dominikschuermann.de>
  * Copyright (C) 2010 Thialfihar <thi@thialfihar.org>
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -17,13 +17,11 @@
 
 package org.sufficientlysecure.keychain.provider;
 
-import java.io.File;
-import java.io.FileNotFoundException;
 import java.util.Arrays;
 import java.util.HashMap;
 
 import org.sufficientlysecure.keychain.Constants;
-import org.sufficientlysecure.keychain.provider.KeychainContract.CryptoConsumers;
+import org.sufficientlysecure.keychain.provider.KeychainContract.ApiApps;
 import org.sufficientlysecure.keychain.provider.KeychainContract.KeyRings;
 import org.sufficientlysecure.keychain.provider.KeychainContract.KeyRingsColumns;
 import org.sufficientlysecure.keychain.provider.KeychainContract.KeyTypes;
@@ -44,7 +42,6 @@ import android.database.sqlite.SQLiteConstraintException;
 import android.database.sqlite.SQLiteDatabase;
 import android.database.sqlite.SQLiteQueryBuilder;
 import android.net.Uri;
-import android.os.ParcelFileDescriptor;
 import android.provider.BaseColumns;
 import android.text.TextUtils;
 
@@ -81,7 +78,9 @@ public class KeychainProvider extends ContentProvider {
     private static final int SECRET_KEY_RING_USER_ID = 221;
     private static final int SECRET_KEY_RING_USER_ID_BY_ROW_ID = 222;
 
-    private static final int CRYPTO_CONSUMERS = 301;
+    private static final int API_APPS = 301;
+    private static final int API_APPS_BY_ROW_ID = 302;
+    private static final int API_APPS_BY_PACKAGE_NAME = 303;
 
     // private static final int DATA_STREAM = 401;
 
@@ -227,9 +226,12 @@ public class KeychainProvider extends ContentProvider {
                 SECRET_KEY_RING_USER_ID_BY_ROW_ID);
 
         /**
-         * Crypto Consumers
+         * API apps
          */
-        matcher.addURI(authority, KeychainContract.BASE_CRYPTO_CONSUMERS, CRYPTO_CONSUMERS);
+        matcher.addURI(authority, KeychainContract.BASE_API_APPS, API_APPS);
+        matcher.addURI(authority, KeychainContract.BASE_API_APPS + "/#", API_APPS_BY_ROW_ID);
+        matcher.addURI(authority, KeychainContract.BASE_API_APPS + "/"
+                + KeychainContract.PATH_BY_PACKAGE_NAME + "/*", API_APPS_BY_PACKAGE_NAME);
 
         /**
          * data stream
@@ -290,8 +292,12 @@ public class KeychainProvider extends ContentProvider {
         case SECRET_KEY_RING_USER_ID_BY_ROW_ID:
             return UserIds.CONTENT_ITEM_TYPE;
 
-        case CRYPTO_CONSUMERS:
-            return CryptoConsumers.CONTENT_TYPE;
+        case API_APPS:
+            return ApiApps.CONTENT_TYPE;
+
+        case API_APPS_BY_ROW_ID:
+        case API_APPS_BY_PACKAGE_NAME:
+            return ApiApps.CONTENT_ITEM_TYPE;
 
         default:
             throw new UnsupportedOperationException("Unknown uri: " + uri);
@@ -600,10 +606,23 @@ public class KeychainProvider extends ContentProvider {
             qb.appendWhereEscapeString(uri.getLastPathSegment());
 
             break;
-            
-        case CRYPTO_CONSUMERS:
-            qb.setTables(Tables.CRYPTO_CONSUMERS);
-            
+
+        case API_APPS:
+            qb.setTables(Tables.API_APPS);
+
+            break;
+        case API_APPS_BY_ROW_ID:
+            qb.setTables(Tables.API_APPS);
+
+            qb.appendWhere(BaseColumns._ID + " = ");
+            qb.appendWhereEscapeString(uri.getLastPathSegment());
+
+            break;
+        case API_APPS_BY_PACKAGE_NAME:
+            qb.setTables(Tables.API_APPS);
+            qb.appendWhere(ApiApps.PACKAGE_NAME + " = ");
+            qb.appendWhereEscapeString(uri.getPathSegments().get(2));
+
             break;
 
         default:
@@ -653,6 +672,7 @@ public class KeychainProvider extends ContentProvider {
 
                 rowId = db.insertOrThrow(Tables.KEY_RINGS, null, values);
                 rowUri = KeyRings.buildPublicKeyRingsUri(Long.toString(rowId));
+                sendBroadcastDatabaseChange(getKeyType(match), getType(uri));
 
                 break;
             case PUBLIC_KEY_RING_KEY:
@@ -660,11 +680,13 @@ public class KeychainProvider extends ContentProvider {
 
                 rowId = db.insertOrThrow(Tables.KEYS, null, values);
                 rowUri = Keys.buildPublicKeysUri(Long.toString(rowId));
+                sendBroadcastDatabaseChange(getKeyType(match), getType(uri));
 
                 break;
             case PUBLIC_KEY_RING_USER_ID:
                 rowId = db.insertOrThrow(Tables.USER_IDS, null, values);
                 rowUri = UserIds.buildPublicUserIdsUri(Long.toString(rowId));
+                sendBroadcastDatabaseChange(getKeyType(match), getType(uri));
 
                 break;
             case SECRET_KEY_RING:
@@ -672,6 +694,7 @@ public class KeychainProvider extends ContentProvider {
 
                 rowId = db.insertOrThrow(Tables.KEY_RINGS, null, values);
                 rowUri = KeyRings.buildSecretKeyRingsUri(Long.toString(rowId));
+                sendBroadcastDatabaseChange(getKeyType(match), getType(uri));
 
                 break;
             case SECRET_KEY_RING_KEY:
@@ -679,6 +702,7 @@ public class KeychainProvider extends ContentProvider {
 
                 rowId = db.insertOrThrow(Tables.KEYS, null, values);
                 rowUri = Keys.buildSecretKeysUri(Long.toString(rowId));
+                sendBroadcastDatabaseChange(getKeyType(match), getType(uri));
 
                 break;
             case SECRET_KEY_RING_USER_ID:
@@ -686,13 +710,17 @@ public class KeychainProvider extends ContentProvider {
                 rowUri = UserIds.buildSecretUserIdsUri(Long.toString(rowId));
 
                 break;
+            case API_APPS:
+                rowId = db.insertOrThrow(Tables.API_APPS, null, values);
+                rowUri = ApiApps.buildIdUri(Long.toString(rowId));
+
+                break;
             default:
                 throw new UnsupportedOperationException("Unknown uri: " + uri);
             }
 
             // notify of changes in db
             getContext().getContentResolver().notifyChange(uri, null);
-            sendBroadcastDatabaseChange(getKeyType(match), getType(uri));
 
         } catch (SQLiteConstraintException e) {
             Log.e(Constants.TAG, "Constraint exception on insert! Entry already existing?");
@@ -720,6 +748,7 @@ public class KeychainProvider extends ContentProvider {
             count = db.delete(Tables.KEY_RINGS,
                     buildDefaultKeyRingsSelection(defaultSelection, getKeyType(match), selection),
                     selectionArgs);
+            sendBroadcastDatabaseChange(getKeyType(match), getType(uri));
             break;
         case PUBLIC_KEY_RING_BY_MASTER_KEY_ID:
         case SECRET_KEY_RING_BY_MASTER_KEY_ID:
@@ -728,24 +757,33 @@ public class KeychainProvider extends ContentProvider {
             count = db.delete(Tables.KEY_RINGS,
                     buildDefaultKeyRingsSelection(defaultSelection, getKeyType(match), selection),
                     selectionArgs);
+            sendBroadcastDatabaseChange(getKeyType(match), getType(uri));
             break;
         case PUBLIC_KEY_RING_KEY_BY_ROW_ID:
         case SECRET_KEY_RING_KEY_BY_ROW_ID:
             count = db.delete(Tables.KEYS,
                     buildDefaultKeysSelection(uri, getKeyType(match), selection), selectionArgs);
+            sendBroadcastDatabaseChange(getKeyType(match), getType(uri));
             break;
         case PUBLIC_KEY_RING_USER_ID_BY_ROW_ID:
         case SECRET_KEY_RING_USER_ID_BY_ROW_ID:
             count = db.delete(Tables.KEYS, buildDefaultUserIdsSelection(uri, selection),
                     selectionArgs);
             break;
+        case API_APPS_BY_ROW_ID:
+            count = db.delete(Tables.API_APPS, buildDefaultApiAppsSelection(uri, false, selection),
+                    selectionArgs);
+            break;
+        case API_APPS_BY_PACKAGE_NAME:
+            count = db.delete(Tables.API_APPS, buildDefaultApiAppsSelection(uri, true, selection),
+                    selectionArgs);
+            break;
         default:
             throw new UnsupportedOperationException("Unknown uri: " + uri);
         }
 
         // notify of changes in db
         getContext().getContentResolver().notifyChange(uri, null);
-        sendBroadcastDatabaseChange(getKeyType(match), getType(uri));
 
         return count;
     }
@@ -771,6 +809,8 @@ public class KeychainProvider extends ContentProvider {
                         values,
                         buildDefaultKeyRingsSelection(defaultSelection, getKeyType(match),
                                 selection), selectionArgs);
+                sendBroadcastDatabaseChange(getKeyType(match), getType(uri));
+
                 break;
             case PUBLIC_KEY_RING_BY_MASTER_KEY_ID:
             case SECRET_KEY_RING_BY_MASTER_KEY_ID:
@@ -781,6 +821,8 @@ public class KeychainProvider extends ContentProvider {
                         values,
                         buildDefaultKeyRingsSelection(defaultSelection, getKeyType(match),
                                 selection), selectionArgs);
+                sendBroadcastDatabaseChange(getKeyType(match), getType(uri));
+
                 break;
             case PUBLIC_KEY_RING_KEY_BY_ROW_ID:
             case SECRET_KEY_RING_KEY_BY_ROW_ID:
@@ -788,19 +830,28 @@ public class KeychainProvider extends ContentProvider {
                         .update(Tables.KEYS, values,
                                 buildDefaultKeysSelection(uri, getKeyType(match), selection),
                                 selectionArgs);
+                sendBroadcastDatabaseChange(getKeyType(match), getType(uri));
+
                 break;
             case PUBLIC_KEY_RING_USER_ID_BY_ROW_ID:
             case SECRET_KEY_RING_USER_ID_BY_ROW_ID:
                 count = db.update(Tables.USER_IDS, values,
                         buildDefaultUserIdsSelection(uri, selection), selectionArgs);
                 break;
+            case API_APPS_BY_ROW_ID:
+                count = db.update(Tables.API_APPS, values,
+                        buildDefaultApiAppsSelection(uri, false, selection), selectionArgs);
+                break;
+            case API_APPS_BY_PACKAGE_NAME:
+                count = db.update(Tables.API_APPS, values,
+                        buildDefaultApiAppsSelection(uri, true, selection), selectionArgs);
+                break;
             default:
                 throw new UnsupportedOperationException("Unknown uri: " + uri);
             }
 
             // notify of changes in db
             getContext().getContentResolver().notifyChange(uri, null);
-            sendBroadcastDatabaseChange(getKeyType(match), getType(uri));
 
         } catch (SQLiteConstraintException e) {
             Log.e(Constants.TAG, "Constraint exception on update! Entry already existing?");
@@ -883,6 +934,29 @@ public class KeychainProvider extends ContentProvider {
         return BaseColumns._ID + "=" + rowId + andForeignKeyRing + andSelection;
     }
 
+    /**
+     * Build default selection statement for API apps. If no extra selection is specified only build
+     * where clause with rowId
+     * 
+     * @param uri
+     * @param selection
+     * @return
+     */
+    private String buildDefaultApiAppsSelection(Uri uri, boolean packageSelection, String selection) {
+        String lastPathSegment = uri.getLastPathSegment();
+
+        String andSelection = "";
+        if (!TextUtils.isEmpty(selection)) {
+            andSelection = " AND (" + selection + ")";
+        }
+
+        if (packageSelection) {
+            return ApiApps.PACKAGE_NAME + "=" + lastPathSegment + andSelection;
+        } else {
+            return BaseColumns._ID + "=" + lastPathSegment + andSelection;
+        }
+    }
+
     // @Override
     // public ParcelFileDescriptor openFile(Uri uri, String mode) throws FileNotFoundException {
     // int match = mUriMatcher.match(uri);
@@ -899,10 +973,12 @@ public class KeychainProvider extends ContentProvider {
      * updated, or deleted
      */
     private void sendBroadcastDatabaseChange(int keyType, String contentItemType) {
-        Intent intent = new Intent();
-        intent.setAction(ACTION_BROADCAST_DATABASE_CHANGE);
-        intent.putExtra(EXTRA_BROADCAST_KEY_TYPE, keyType);
-        intent.putExtra(EXTRA_BROADCAST_CONTENT_ITEM_TYPE, contentItemType);
-        getContext().sendBroadcast(intent, Constants.PERMISSION_ACCESS_API);
+        // TODO: Disabled, old API
+        // Intent intent = new Intent();
+        // intent.setAction(ACTION_BROADCAST_DATABASE_CHANGE);
+        // intent.putExtra(EXTRA_BROADCAST_KEY_TYPE, keyType);
+        // intent.putExtra(EXTRA_BROADCAST_CONTENT_ITEM_TYPE, contentItemType);
+        //
+        // getContext().sendBroadcast(intent, Constants.PERMISSION_ACCESS_API);
     }
 }
diff --git a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/provider/ProviderHelper.java b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/provider/ProviderHelper.java
index 57d3b54d6..d0fcfe999 100644
--- a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/provider/ProviderHelper.java
+++ b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/provider/ProviderHelper.java
@@ -31,11 +31,12 @@ import org.sufficientlysecure.keychain.Constants;
 import org.sufficientlysecure.keychain.helper.PgpConversionHelper;
 import org.sufficientlysecure.keychain.helper.PgpHelper;
 import org.sufficientlysecure.keychain.helper.PgpMain;
-import org.sufficientlysecure.keychain.provider.KeychainContract.CryptoConsumers;
+import org.sufficientlysecure.keychain.provider.KeychainContract.ApiApps;
 import org.sufficientlysecure.keychain.provider.KeychainContract.KeyRings;
 import org.sufficientlysecure.keychain.provider.KeychainContract.Keys;
 import org.sufficientlysecure.keychain.provider.KeychainContract.UserIds;
 import org.sufficientlysecure.keychain.provider.KeychainDatabase.Tables;
+import org.sufficientlysecure.keychain.remote_api.AppSettings;
 import org.sufficientlysecure.keychain.util.IterableIterator;
 import org.sufficientlysecure.keychain.util.Log;
 
@@ -718,13 +719,13 @@ public class ProviderHelper {
         return cursor;
     }
 
-    public static ArrayList<String> getCryptoConsumers(Context context) {
-        Cursor cursor = context.getContentResolver().query(CryptoConsumers.CONTENT_URI, null, null,
-                null, null);
+    public static ArrayList<String> getRegisteredApiApps(Context context) {
+        Cursor cursor = context.getContentResolver().query(ApiApps.CONTENT_URI, null, null, null,
+                null);
 
         ArrayList<String> packageNames = new ArrayList<String>();
         if (cursor != null) {
-            int packageNameCol = cursor.getColumnIndex(CryptoConsumers.PACKAGE_NAME);
+            int packageNameCol = cursor.getColumnIndex(ApiApps.PACKAGE_NAME);
             if (cursor.moveToFirst()) {
                 do {
                     packageNames.add(cursor.getString(packageNameCol));
@@ -739,9 +740,53 @@ public class ProviderHelper {
         return packageNames;
     }
 
-    public static void addCryptoConsumer(Context context, String packageName) {
+    private static void contentValueForApiApps() {
+
+    }
+
+    public static void insertApiApp(Context context, AppSettings appSettings) {
         ContentValues values = new ContentValues();
-        values.put(CryptoConsumers.PACKAGE_NAME, packageName);
-        context.getContentResolver().insert(CryptoConsumers.CONTENT_URI, values);
+        values.put(ApiApps.PACKAGE_NAME, appSettings.getPackageName());
+        values.put(ApiApps.KEY_ID, appSettings.getKeyId());
+        values.put(ApiApps.ASCII_ARMOR, appSettings.isAsciiArmor());
+        // TODO: other parameters
+        context.getContentResolver().insert(ApiApps.CONTENT_URI, values);
+    }
+
+    public static void updateApiApp(Context context, AppSettings appSettings, Uri uri) {
+        final ContentValues cv = new ContentValues();
+        cv.put(KeychainContract.ApiApps.KEY_ID, appSettings.getKeyId());
+
+        cv.put(KeychainContract.ApiApps.ASCII_ARMOR, appSettings.isAsciiArmor());
+        // TODO: other parameters
+
+        if (context.getContentResolver().update(uri, cv, null, null) <= 0) {
+            throw new RuntimeException();
+        }
+    }
+
+    public static AppSettings getApiAppSettings(Context context, Uri uri) {
+        AppSettings settings = new AppSettings();
+        Cursor cur = context.getContentResolver().query(uri, null, null, null, null);
+        if (cur == null) {
+            return null;
+        }
+        if (cur.moveToFirst()) {
+            settings.setPackageName(cur.getString(cur
+                    .getColumnIndex(KeychainContract.ApiApps.PACKAGE_NAME)));
+
+            settings.setKeyId(cur.getLong(cur.getColumnIndex(KeychainContract.ApiApps.KEY_ID)));
+
+            settings.setAsciiArmor(cur.getInt(cur
+                    .getColumnIndexOrThrow(KeychainContract.ApiApps.ASCII_ARMOR)) == 1);
+
+            settings.setPackageName(cur.getString(cur
+                    .getColumnIndex(KeychainContract.ApiApps.PACKAGE_NAME)));
+
+            settings.setPackageName(cur.getString(cur
+                    .getColumnIndex(KeychainContract.ApiApps.PACKAGE_NAME)));
+        }
+
+        return settings;
     }
 }
diff --git a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/remote_api/AppSettings.java b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/remote_api/AppSettings.java
new file mode 100644
index 000000000..fe251a5e7
--- /dev/null
+++ b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/remote_api/AppSettings.java
@@ -0,0 +1,70 @@
+package org.sufficientlysecure.keychain.remote_api;
+
+import org.sufficientlysecure.keychain.Id;
+
+public class AppSettings {
+    private String packageName;
+    private long keyId = Id.key.none;
+    private boolean asciiArmor;
+    private int encryptionAlgorithm = 7; // AES-128
+    private int hashAlgorithm = 10; // SHA-512
+    private int compression = 2; // zlib
+
+    public AppSettings() {
+
+    }
+
+    public AppSettings(String packageName) {
+        super();
+        this.packageName = packageName;
+    }
+
+    public String getPackageName() {
+        return packageName;
+    }
+
+    public void setPackageName(String packageName) {
+        this.packageName = packageName;
+    }
+
+    public long getKeyId() {
+        return keyId;
+    }
+
+    public void setKeyId(long scretKeyId) {
+        this.keyId = scretKeyId;
+    }
+
+    public boolean isAsciiArmor() {
+        return asciiArmor;
+    }
+
+    public void setAsciiArmor(boolean asciiArmor) {
+        this.asciiArmor = asciiArmor;
+    }
+
+    public int getEncryptionAlgorithm() {
+        return encryptionAlgorithm;
+    }
+
+    public void setEncryptionAlgorithm(int encryptionAlgorithm) {
+        this.encryptionAlgorithm = encryptionAlgorithm;
+    }
+
+    public int getHashAlgorithm() {
+        return hashAlgorithm;
+    }
+
+    public void setHashAlgorithm(int hashAlgorithm) {
+        this.hashAlgorithm = hashAlgorithm;
+    }
+
+    public int getCompression() {
+        return compression;
+    }
+
+    public void setCompression(int compression) {
+        this.compression = compression;
+    }
+
+}
diff --git a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/remote_api/AppSettingsActivity.java b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/remote_api/AppSettingsActivity.java
new file mode 100644
index 000000000..155369601
--- /dev/null
+++ b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/remote_api/AppSettingsActivity.java
@@ -0,0 +1,107 @@
+package org.sufficientlysecure.keychain.remote_api;
+
+import org.sufficientlysecure.keychain.Constants;
+import org.sufficientlysecure.keychain.R;
+import org.sufficientlysecure.keychain.provider.ProviderHelper;
+import org.sufficientlysecure.keychain.util.Log;
+
+import android.content.Intent;
+import android.net.Uri;
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.widget.TextView;
+
+import com.actionbarsherlock.app.ActionBar;
+import com.actionbarsherlock.app.SherlockFragmentActivity;
+import com.actionbarsherlock.view.Menu;
+import com.actionbarsherlock.view.MenuItem;
+
+public class AppSettingsActivity extends SherlockFragmentActivity {
+    private Uri mAppUri;
+
+    private AppSettingsFragment settingsFragment;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        // Inflate a "Done" custom action bar view to serve as the "Up" affordance.
+        final LayoutInflater inflater = (LayoutInflater) getSupportActionBar().getThemedContext()
+                .getSystemService(LAYOUT_INFLATER_SERVICE);
+        final View customActionBarView = inflater
+                .inflate(R.layout.actionbar_custom_view_done, null);
+
+        ((TextView) customActionBarView.findViewById(R.id.actionbar_done_text))
+                .setText(R.string.api_settings_save);
+        customActionBarView.findViewById(R.id.actionbar_done).setOnClickListener(
+                new View.OnClickListener() {
+                    @Override
+                    public void onClick(View v) {
+                        // "Done"
+                        save();
+                    }
+                });
+
+        // Show the custom action bar view and hide the normal Home icon and title.
+        final ActionBar actionBar = getSupportActionBar();
+        actionBar.setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM, ActionBar.DISPLAY_SHOW_CUSTOM
+                | ActionBar.DISPLAY_SHOW_HOME | ActionBar.DISPLAY_SHOW_TITLE);
+        actionBar.setCustomView(customActionBarView);
+
+        setContentView(R.layout.api_app_settings_activity);
+
+        settingsFragment = (AppSettingsFragment) getSupportFragmentManager().findFragmentById(
+                R.id.api_app_settings_fragment);
+
+        Intent intent = getIntent();
+        mAppUri = intent.getData();
+        if (mAppUri == null) {
+            Log.e(Constants.TAG, "Intent data missing. Should be Uri of app!");
+            finish();
+            return;
+        } else {
+            Log.d(Constants.TAG, "uri: " + mAppUri);
+            loadData(mAppUri);
+        }
+    }
+
+    @Override
+    public boolean onCreateOptionsMenu(Menu menu) {
+        super.onCreateOptionsMenu(menu);
+        getSupportMenuInflater().inflate(R.menu.api_app_settings, menu);
+        return true;
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        switch (item.getItemId()) {
+        case R.id.menu_api_settings_revoke:
+            revokeAccess();
+            return true;
+        case R.id.menu_api_settings_cancel:
+            finish();
+            return true;
+        }
+        return super.onOptionsItemSelected(item);
+    }
+
+    private void loadData(Uri appUri) {
+        AppSettings settings = ProviderHelper.getApiAppSettings(this, appUri);
+        settingsFragment.setAppSettings(settings);
+    }
+
+    private void revokeAccess() {
+        if (getContentResolver().delete(mAppUri, null, null) <= 0) {
+            throw new RuntimeException();
+        }
+        finish();
+    }
+
+    private void save() {
+        ProviderHelper.updateApiApp(this, settingsFragment.getAppSettings(), mAppUri);
+
+        finish();
+    }
+
+}
diff --git a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/remote_api/AppSettingsFragment.java b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/remote_api/AppSettingsFragment.java
new file mode 100644
index 000000000..1bb447a7d
--- /dev/null
+++ b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/remote_api/AppSettingsFragment.java
@@ -0,0 +1,208 @@
+package org.sufficientlysecure.keychain.remote_api;
+
+import org.spongycastle.openpgp.PGPSecretKey;
+import org.spongycastle.openpgp.PGPSecretKeyRing;
+import org.sufficientlysecure.keychain.Constants;
+import org.sufficientlysecure.keychain.Id;
+import org.sufficientlysecure.keychain.R;
+import org.sufficientlysecure.keychain.helper.PgpHelper;
+import org.sufficientlysecure.keychain.provider.ProviderHelper;
+import org.sufficientlysecure.keychain.ui.SelectSecretKeyActivity;
+import org.sufficientlysecure.keychain.util.Log;
+
+import android.app.Activity;
+import android.content.Intent;
+import android.content.pm.ApplicationInfo;
+import android.content.pm.PackageManager;
+import android.content.pm.PackageManager.NameNotFoundException;
+import android.graphics.drawable.Drawable;
+import android.os.Bundle;
+import android.support.v4.app.Fragment;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.view.ViewGroup;
+import android.view.animation.AlphaAnimation;
+import android.view.animation.Animation;
+import android.widget.Button;
+import android.widget.CheckBox;
+import android.widget.CompoundButton;
+import android.widget.CompoundButton.OnCheckedChangeListener;
+import android.widget.ImageView;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+
+public class AppSettingsFragment extends Fragment {
+
+    // model
+    private AppSettings appSettings;
+
+    // view
+    private LinearLayout mAdvancedSettingsContainer;
+    private Button mAdvancedSettingsButton;
+    private TextView mAppNameView;
+    private ImageView mAppIconView;
+    private TextView mKeyUserId;
+    private TextView mKeyUserIdRest;
+    private Button mSelectKeyButton;
+    private CheckBox mAsciiArmorCheckBox;
+
+    public AppSettings getAppSettings() {
+        return appSettings;
+    }
+
+    public void setAppSettings(AppSettings appSettings) {
+        this.appSettings = appSettings;
+        setPackage(appSettings.getPackageName());
+        updateSelectedKeyView(appSettings.getKeyId());
+        mAsciiArmorCheckBox.setChecked(appSettings.isAsciiArmor());
+    }
+
+    /**
+     * Inflate the layout for this fragment
+     */
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
+        View view = inflater.inflate(R.layout.api_app_settings_fragment, container, false);
+        initView(view);
+        return view;
+    }
+
+    private void initView(View view) {
+        mAdvancedSettingsButton = (Button) view.findViewById(R.id.api_app_settings_advanced_button);
+        mAdvancedSettingsContainer = (LinearLayout) view
+                .findViewById(R.id.api_app_settings_advanced);
+
+        mAppNameView = (TextView) view.findViewById(R.id.api_app_settings_app_name);
+        mAppIconView = (ImageView) view.findViewById(R.id.api_app_settings_app_icon);
+        mKeyUserId = (TextView) view.findViewById(R.id.api_app_settings_user_id);
+        mKeyUserIdRest = (TextView) view.findViewById(R.id.api_app_settings_user_id_rest);
+        mSelectKeyButton = (Button) view.findViewById(R.id.api_app_settings_select_key_button);
+        mAsciiArmorCheckBox = (CheckBox) view.findViewById(R.id.api_app_ascii_armor);
+
+        mSelectKeyButton.setOnClickListener(new OnClickListener() {
+
+            @Override
+            public void onClick(View v) {
+                selectSecretKey();
+            }
+        });
+
+        mAsciiArmorCheckBox.setOnCheckedChangeListener(new OnCheckedChangeListener() {
+
+            @Override
+            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
+                appSettings.setAsciiArmor(isChecked);
+            }
+        });
+
+        final Animation visibleAnimation = new AlphaAnimation(0.0f, 1.0f);
+        visibleAnimation.setDuration(250);
+        final Animation invisibleAnimation = new AlphaAnimation(1.0f, 0.0f);
+        invisibleAnimation.setDuration(250);
+
+        // TODO: Better: collapse/expand animation
+        // final Animation animation2 = new TranslateAnimation(Animation.RELATIVE_TO_SELF, 0.0f,
+        // Animation.RELATIVE_TO_SELF, 0.0f, Animation.RELATIVE_TO_SELF, -1.0f,
+        // Animation.RELATIVE_TO_SELF, 0.0f);
+        // animation2.setDuration(150);
+
+        mAdvancedSettingsButton.setOnClickListener(new OnClickListener() {
+
+            @Override
+            public void onClick(View v) {
+                if (mAdvancedSettingsContainer.getVisibility() == View.VISIBLE) {
+                    mAdvancedSettingsContainer.startAnimation(invisibleAnimation);
+                    mAdvancedSettingsContainer.setVisibility(View.INVISIBLE);
+                    mAdvancedSettingsButton.setText(R.string.api_settings_show_advanced);
+                } else {
+                    mAdvancedSettingsContainer.startAnimation(visibleAnimation);
+                    mAdvancedSettingsContainer.setVisibility(View.VISIBLE);
+                    mAdvancedSettingsButton.setText(R.string.api_settings_hide_advanced);
+                }
+            }
+        });
+    }
+
+    @Override
+    public void onActivityCreated(Bundle savedInstanceState) {
+        super.onActivityCreated(savedInstanceState);
+    }
+
+    private void selectSecretKey() {
+        Intent intent = new Intent(getActivity(), SelectSecretKeyActivity.class);
+        startActivityForResult(intent, Id.request.secret_keys);
+    }
+
+    private void setPackage(String packageName) {
+        PackageManager pm = getActivity().getApplicationContext().getPackageManager();
+
+        // get application name and icon from package manager
+        String appName = null;
+        Drawable appIcon = null;
+        try {
+            ApplicationInfo ai = pm.getApplicationInfo(packageName, 0);
+
+            appName = (String) pm.getApplicationLabel(ai);
+            appIcon = pm.getApplicationIcon(ai);
+        } catch (final NameNotFoundException e) {
+            // fallback
+            appName = packageName;
+        }
+        mAppNameView.setText(appName);
+        mAppIconView.setImageDrawable(appIcon);
+    }
+
+    private void updateSelectedKeyView(long secretKeyId) {
+        if (secretKeyId == Id.key.none) {
+            mKeyUserId.setText(R.string.api_settings_no_key);
+            mKeyUserIdRest.setText("");
+        } else {
+            String uid = getResources().getString(R.string.unknownUserId);
+            String uidExtra = "";
+            PGPSecretKeyRing keyRing = ProviderHelper.getPGPSecretKeyRingByMasterKeyId(
+                    getActivity(), secretKeyId);
+            if (keyRing != null) {
+                PGPSecretKey key = PgpHelper.getMasterKey(keyRing);
+                if (key != null) {
+                    String userId = PgpHelper.getMainUserIdSafe(getActivity(), key);
+                    String chunks[] = userId.split(" <", 2);
+                    uid = chunks[0];
+                    if (chunks.length > 1) {
+                        uidExtra = "<" + chunks[1];
+                    }
+                }
+            }
+            mKeyUserId.setText(uid);
+            mKeyUserIdRest.setText(uidExtra);
+        }
+    }
+
+    @Override
+    public void onActivityResult(int requestCode, int resultCode, Intent data) {
+        Log.d(Constants.TAG, "onactivityresult     " + requestCode + "   " + resultCode);
+        switch (requestCode) {
+
+        case Id.request.secret_keys: {
+            long secretKeyId;
+            if (resultCode == Activity.RESULT_OK) {
+                Bundle bundle = data.getExtras();
+                secretKeyId = bundle.getLong(SelectSecretKeyActivity.RESULT_EXTRA_MASTER_KEY_ID);
+
+            } else {
+                secretKeyId = Id.key.none;
+            }
+            appSettings.setKeyId(secretKeyId);
+            updateSelectedKeyView(secretKeyId);
+            break;
+        }
+
+        default: {
+            break;
+        }
+        }
+
+        super.onActivityResult(requestCode, resultCode, data);
+    }
+
+}
diff --git a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/remote_api/CryptoService.java b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/remote_api/CryptoService.java
new file mode 100644
index 000000000..125967c66
--- /dev/null
+++ b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/remote_api/CryptoService.java
@@ -0,0 +1,409 @@
+/*
+ * 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.remote_api;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.util.ArrayList;
+import java.util.concurrent.ArrayBlockingQueue;
+import java.util.concurrent.TimeUnit;
+import java.util.prefs.Preferences;
+
+import org.openintents.crypto.CryptoError;
+import org.openintents.crypto.CryptoSignatureResult;
+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.provider.KeychainContract;
+import org.sufficientlysecure.keychain.provider.ProviderHelper;
+import org.sufficientlysecure.keychain.remote_api.IServiceActivityCallback;
+import org.sufficientlysecure.keychain.service.KeychainIntentService;
+import org.sufficientlysecure.keychain.service.PassphraseCacheService;
+import org.sufficientlysecure.keychain.util.PausableThreadPoolExecutor;
+import org.openintents.crypto.ICryptoCallback;
+import org.openintents.crypto.ICryptoService;
+
+import android.app.Service;
+import android.content.Context;
+import android.content.Intent;
+import android.net.Uri;
+import android.os.Binder;
+import android.os.Bundle;
+import android.os.IBinder;
+import android.os.RemoteException;
+
+public class CryptoService extends Service {
+    Context mContext;
+
+    // just one pool of 4 threads, pause on every user action needed
+    final ArrayBlockingQueue<Runnable> mPoolQueue = new ArrayBlockingQueue<Runnable>(20);
+    PausableThreadPoolExecutor mThreadPool = new PausableThreadPoolExecutor(2, 4, 10,
+            TimeUnit.SECONDS, mPoolQueue);
+
+    public static final String ACTION_SERVICE_ACTIVITY = "org.sufficientlysecure.keychain.crypto_provider.IServiceActivityCallback";
+
+    @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 different binder for connections from internal service activity
+        if (ACTION_SERVICE_ACTIVITY.equals(intent.getAction())) {
+
+            // this binder can only be used from OpenPGP Keychain
+            if (isCallerAllowed(true)) {
+                return mBinderServiceActivity;
+            } else {
+                Log.e(Constants.TAG, "This binder can only be used from " + Constants.PACKAGE_NAME);
+                return null;
+            }
+        } else {
+            return mBinder;
+        }
+    }
+
+    private String getCachedPassphrase(long keyId) {
+        String passphrase = PassphraseCacheService.getCachedPassphrase(mContext, keyId);
+
+        if (passphrase == null) {
+            Log.d(Constants.TAG, "No passphrase! Activity required!");
+
+            // start passphrase dialog
+            Bundle extras = new Bundle();
+            extras.putLong(CryptoServiceActivity.EXTRA_SECRET_KEY_ID, keyId);
+            pauseQueueAndStartServiceActivity(CryptoServiceActivity.ACTION_CACHE_PASSPHRASE, extras);
+        }
+
+        return passphrase;
+    }
+
+    private synchronized void encryptSafe(byte[] inputBytes, String[] encryptionUserIds,
+            AppSettings appSettings, 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();
+
+            String passphrase = getCachedPassphrase(appSettings.getKeyId());
+
+            PgpMain.encryptAndSign(mContext, null, inputData, outputStream,
+                    appSettings.isAsciiArmor(), appSettings.getCompression(), new long[] {},
+                    "test", appSettings.getEncryptionAlgorithm(), Id.key.none,
+                    appSettings.getHashAlgorithm(), true, passphrase);
+
+            // PgpMain.encryptAndSign(this, this, inputData, outputStream,
+            // appSettings.isAsciiArmor(),
+            // appSettings.getCompression(), encryptionKeyIds, encryptionPassphrase,
+            // appSettings.getEncryptionAlgorithm(), appSettings.getKeyId(),
+            // appSettings.getHashAlgorithm(), true, passphrase);
+
+            outputStream.close();
+
+            byte[] outputBytes = ((ByteArrayOutputStream) outputStream).toByteArray();
+
+            // return over handler on client side
+            callback.onSuccess(outputBytes, null);
+        } 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 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();
+
+            // TODO: This allows to decrypt messages with ALL secret keys, not only the one for the
+            // app, Fix this?
+            long secretKeyId = PgpMain.getDecryptionKeyId(mContext, inputStream);
+            if (secretKeyId == Id.key.none) {
+                throw new PgpMain.PgpGeneralException(getString(R.string.error_noSecretKeyFound));
+            }
+
+            Log.d(Constants.TAG, "Got input:\n" + new String(inputBytes));
+
+            Log.d(Constants.TAG, "secretKeyId " + secretKeyId);
+
+            String passphrase = getCachedPassphrase(secretKeyId);
+
+            // 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.onSuccess(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(final byte[] inputBytes, final String[] encryptionUserIds,
+                final ICryptoCallback callback) throws RemoteException {
+
+            final AppSettings settings = getAppSettings();
+
+            Runnable r = new Runnable() {
+
+                @Override
+                public void run() {
+                    try {
+                        encryptSafe(inputBytes, encryptionUserIds, settings, callback);
+                    } catch (RemoteException e) {
+                        Log.e(Constants.TAG, "CryptoService", e);
+                    }
+                }
+            };
+
+            checkAndEnqueue(r);
+        }
+
+        @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(final byte[] inputBytes, final ICryptoCallback callback)
+                throws RemoteException {
+
+            Runnable r = new Runnable() {
+
+                @Override
+                public void run() {
+                    try {
+                        decryptAndVerifySafe(inputBytes, callback);
+                    } catch (RemoteException e) {
+                        Log.e(Constants.TAG, "CryptoService", e);
+                    }
+                }
+            };
+
+            checkAndEnqueue(r);
+        }
+
+        @Override
+        public void setup(boolean asciiArmor, boolean newKeyring, String newKeyringUserId)
+                throws RemoteException {
+            // TODO Auto-generated method stub
+
+        }
+
+    };
+
+    private final IServiceActivityCallback.Stub mBinderServiceActivity = new IServiceActivityCallback.Stub() {
+
+        @Override
+        public void onRegistered(boolean success, String packageName) throws RemoteException {
+
+            if (success) {
+                // resume threads
+                if (isPackageAllowed(packageName, false)) {
+                    mThreadPool.resume();
+                } else {
+                    // TODO: should not happen?
+                }
+            } else {
+                // TODO
+                mPoolQueue.clear();
+            }
+
+        }
+
+        @Override
+        public void onCachedPassphrase(boolean success) throws RemoteException {
+
+        }
+
+    };
+
+    private void checkAndEnqueue(Runnable r) {
+        if (isCallerAllowed(false)) {
+            mThreadPool.execute(r);
+
+            Log.d(Constants.TAG, "Enqueued runnable…");
+        } else {
+            String[] callingPackages = getPackageManager()
+                    .getPackagesForUid(Binder.getCallingUid());
+
+            Log.e(Constants.TAG, "Not allowed to use service! Starting activity for registration!");
+            Bundle extras = new Bundle();
+            // TODO: currently simply uses first entry
+            extras.putString(CryptoServiceActivity.EXTRA_PACKAGE_NAME, callingPackages[0]);
+            pauseQueueAndStartServiceActivity(CryptoServiceActivity.ACTION_REGISTER, extras);
+
+            mThreadPool.execute(r);
+
+            Log.d(Constants.TAG, "Enqueued runnable…");
+        }
+    }
+
+    /**
+     * Checks if process that binds to this service (i.e. the package name corresponding to the
+     * process) is in the list of allowed package names.
+     * 
+     * @param allowOnlySelf
+     *            allow only Keychain app itself
+     * @return true if process is allowed to use this service
+     */
+    private boolean isCallerAllowed(boolean allowOnlySelf) {
+        String[] callingPackages = getPackageManager().getPackagesForUid(Binder.getCallingUid());
+
+        // is calling package allowed to use this service?
+        for (int i = 0; i < callingPackages.length; i++) {
+            String currentPkg = callingPackages[i];
+
+            if (isPackageAllowed(currentPkg, allowOnlySelf)) {
+                return true;
+            }
+        }
+
+        Log.d(Constants.TAG, "Caller is NOT allowed!");
+        return false;
+    }
+
+    private AppSettings getAppSettings() {
+        String[] callingPackages = getPackageManager().getPackagesForUid(Binder.getCallingUid());
+
+        // is calling package allowed to use this service?
+        for (int i = 0; i < callingPackages.length; i++) {
+            String currentPkg = callingPackages[i];
+
+            Uri uri = KeychainContract.ApiApps.buildByPackageNameUri(currentPkg);
+
+            AppSettings settings = ProviderHelper.getApiAppSettings(this, uri);
+
+            return settings;
+        }
+
+        return null;
+    }
+
+    /**
+     * Checks if packageName is a registered app for the API.
+     * 
+     * @param packageName
+     * @param allowOnlySelf
+     *            allow only Keychain app itself
+     * @return
+     */
+    private boolean isPackageAllowed(String packageName, boolean allowOnlySelf) {
+        Log.d(Constants.TAG, "packageName: " + packageName);
+
+        ArrayList<String> allowedPkgs = ProviderHelper.getRegisteredApiApps(mContext);
+        Log.d(Constants.TAG, "allowed: " + allowedPkgs);
+
+        // check if package is allowed to use our service
+        if (allowedPkgs.contains(packageName) && (!allowOnlySelf)) {
+            Log.d(Constants.TAG, "Package is allowed! packageName: " + packageName);
+
+            return true;
+        } else if (Constants.PACKAGE_NAME.equals(packageName)) {
+            Log.d(Constants.TAG, "Package is OpenPGP Keychain! -> allowed!");
+
+            return true;
+        }
+
+        return false;
+    }
+
+    private void pauseQueueAndStartServiceActivity(String action, Bundle extras) {
+        mThreadPool.pause();
+
+        Log.d(Constants.TAG, "starting activity...");
+        Intent intent = new Intent(getBaseContext(), CryptoServiceActivity.class);
+        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+        intent.setAction(action);
+        if (extras != null) {
+            intent.putExtras(extras);
+        }
+        getApplication().startActivity(intent);
+    }
+
+}
diff --git a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/remote_api/CryptoServiceActivity.java b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/remote_api/CryptoServiceActivity.java
new file mode 100644
index 000000000..06c64559a
--- /dev/null
+++ b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/remote_api/CryptoServiceActivity.java
@@ -0,0 +1,267 @@
+/*
+ * 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.remote_api;
+
+import org.sufficientlysecure.keychain.Constants;
+import org.sufficientlysecure.keychain.Id;
+import org.sufficientlysecure.keychain.R;
+import org.sufficientlysecure.keychain.helper.PgpMain;
+import org.sufficientlysecure.keychain.provider.ProviderHelper;
+import org.sufficientlysecure.keychain.ui.dialog.PassphraseDialogFragment;
+import org.sufficientlysecure.keychain.util.Log;
+
+import android.content.ComponentName;
+import android.content.Context;
+import android.content.Intent;
+import android.content.ServiceConnection;
+import android.os.Bundle;
+import android.os.Handler;
+import android.os.IBinder;
+import android.os.Message;
+import android.os.Messenger;
+import android.os.RemoteException;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import com.actionbarsherlock.app.ActionBar;
+import com.actionbarsherlock.app.SherlockFragmentActivity;
+
+public class CryptoServiceActivity extends SherlockFragmentActivity {
+
+    public static final String ACTION_REGISTER = "org.sufficientlysecure.keychain.remote_api.REGISTER";
+    public static final String ACTION_CACHE_PASSPHRASE = "org.sufficientlysecure.keychain.remote_api.CRYPTO_CACHE_PASSPHRASE";
+
+    public static final String EXTRA_SECRET_KEY_ID = "secretKeyId";
+    public static final String EXTRA_PACKAGE_NAME = "packageName";
+
+    private IServiceActivityCallback mServiceCallback;
+    private boolean mServiceBound;
+
+    // view
+    AppSettingsFragment settingsFragment;
+
+    private ServiceConnection mServiceActivityConnection = new ServiceConnection() {
+        public void onServiceConnected(ComponentName name, IBinder service) {
+            mServiceCallback = IServiceActivityCallback.Stub.asInterface(service);
+            Log.d(Constants.TAG, "connected to ICryptoServiceActivity");
+            mServiceBound = true;
+        }
+
+        public void onServiceDisconnected(ComponentName name) {
+            mServiceCallback = null;
+            Log.d(Constants.TAG, "disconnected from ICryptoServiceActivity");
+            mServiceBound = false;
+        }
+    };
+
+    /**
+     * If not already bound, bind!
+     * 
+     * @return
+     */
+    public boolean bindToService() {
+        if (mServiceCallback == null && !mServiceBound) { // if not already connected
+            try {
+                Log.d(Constants.TAG, "not bound yet");
+
+                Intent serviceIntent = new Intent();
+                serviceIntent
+                        .setAction("org.sufficientlysecure.keychain.crypto_provider.IServiceActivityCallback");
+                bindService(serviceIntent, mServiceActivityConnection, Context.BIND_AUTO_CREATE);
+
+                return true;
+            } catch (Exception e) {
+                Log.d(Constants.TAG, "Exception", e);
+                return false;
+            }
+        } else { // already connected
+            Log.d(Constants.TAG, "already bound... ");
+            return true;
+        }
+    }
+
+    public void unbindFromService() {
+        unbindService(mServiceActivityConnection);
+    }
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        Log.d(Constants.TAG, "onCreate…");
+
+        // bind to our own crypto service
+        bindToService();
+
+        handleActions(getIntent());
+    }
+
+    @Override
+    protected void onDestroy() {
+        super.onDestroy();
+
+        // unbind from our crypto service
+        if (mServiceActivityConnection != null) {
+            unbindFromService();
+        }
+    }
+
+    protected void handleActions(Intent intent) {
+        String action = intent.getAction();
+        Bundle extras = intent.getExtras();
+
+        if (extras == null) {
+            extras = new Bundle();
+        }
+
+        /**
+         * com.android.crypto actions
+         */
+        if (ACTION_REGISTER.equals(action)) {
+            final String packageName = extras.getString(EXTRA_PACKAGE_NAME);
+
+            // Inflate a "Done"/"Cancel" custom action bar view
+            final LayoutInflater inflater = (LayoutInflater) getSupportActionBar()
+                    .getThemedContext().getSystemService(LAYOUT_INFLATER_SERVICE);
+            final View customActionBarView = inflater.inflate(
+                    R.layout.actionbar_custom_view_done_cancel, null);
+
+            ((TextView) customActionBarView.findViewById(R.id.actionbar_done_text))
+                    .setText(R.string.api_register_allow);
+            customActionBarView.findViewById(R.id.actionbar_done).setOnClickListener(
+                    new View.OnClickListener() {
+                        @Override
+                        public void onClick(View v) {
+                            // Allow
+
+                            // user needs to select a key!
+                            if (settingsFragment.getAppSettings().getKeyId() == Id.key.none) {
+                                Toast.makeText(CryptoServiceActivity.this,
+                                        R.string.api_register_error_select_key, Toast.LENGTH_LONG)
+                                        .show();
+                            } else {
+                                ProviderHelper.insertApiApp(CryptoServiceActivity.this,
+                                        settingsFragment.getAppSettings());
+
+                                try {
+                                    mServiceCallback.onRegistered(true, packageName);
+                                } catch (RemoteException e) {
+                                    Log.e(Constants.TAG, "ServiceActivity");
+                                }
+                                finish();
+                            }
+                        }
+                    });
+            ((TextView) customActionBarView.findViewById(R.id.actionbar_cancel_text))
+                    .setText(R.string.api_register_disallow);
+            customActionBarView.findViewById(R.id.actionbar_cancel).setOnClickListener(
+                    new View.OnClickListener() {
+                        @Override
+                        public void onClick(View v) {
+                            // Disallow
+                            try {
+                                mServiceCallback.onRegistered(false, packageName);
+                            } catch (RemoteException e) {
+                                Log.e(Constants.TAG, "ServiceActivity");
+                            }
+                            finish();
+                        }
+                    });
+
+            // Show the custom action bar view and hide the normal Home icon and title.
+            final ActionBar actionBar = getSupportActionBar();
+            actionBar.setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM,
+                    ActionBar.DISPLAY_SHOW_CUSTOM | ActionBar.DISPLAY_SHOW_HOME
+                            | ActionBar.DISPLAY_SHOW_TITLE);
+            actionBar.setCustomView(customActionBarView, new ActionBar.LayoutParams(
+                    ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
+
+            setContentView(R.layout.api_app_register_activity);
+
+            settingsFragment = (AppSettingsFragment) getSupportFragmentManager().findFragmentById(
+                    R.id.api_app_settings_fragment);
+
+            AppSettings settings = new AppSettings(packageName);
+            settingsFragment.setAppSettings(settings);
+            
+
+            // TODO: handle if app is already registered
+            // LinearLayout layoutRegister = (LinearLayout)
+            // findViewById(R.id.register_crypto_consumer_register_layout);
+            // LinearLayout layoutEdit = (LinearLayout)
+            // findViewById(R.id.register_crypto_consumer_edit_layout);
+            //
+            // // if already registered show edit buttons
+            // ArrayList<String> allowedPkgs = ProviderHelper.getCryptoConsumers(this);
+            // if (allowedPkgs.contains(packageName)) {
+            // Log.d(Constants.TAG, "Package is allowed! packageName: " + packageName);
+            // layoutRegister.setVisibility(View.GONE);
+            // layoutEdit.setVisibility(View.VISIBLE);
+            // } else {
+            // layoutRegister.setVisibility(View.VISIBLE);
+            // layoutEdit.setVisibility(View.GONE);
+            // }
+
+        } else if (ACTION_CACHE_PASSPHRASE.equals(action)) {
+            long secretKeyId = extras.getLong(EXTRA_SECRET_KEY_ID);
+
+            showPassphraseDialog(secretKeyId);
+        } else {
+            Log.e(Constants.TAG, "Wrong action!");
+            finish();
+        }
+    }
+
+    /**
+     * Shows passphrase dialog to cache a new passphrase the user enters for using it later for
+     * encryption. Based on mSecretKeyId it asks for a passphrase to open a private key or it asks
+     * for a symmetric passphrase
+     */
+    private void showPassphraseDialog(long secretKeyId) {
+        // Message is received after passphrase is cached
+        Handler returnHandler = new Handler() {
+            @Override
+            public void handleMessage(Message message) {
+                if (message.what == PassphraseDialogFragment.MESSAGE_OKAY) {
+                    try {
+                        mServiceCallback.onCachedPassphrase(true);
+                    } catch (RemoteException e) {
+                        Log.e(Constants.TAG, "ServiceActivity");
+                    }
+                    finish();
+                }
+            }
+        };
+
+        // Create a new Messenger for the communication back
+        Messenger messenger = new Messenger(returnHandler);
+
+        try {
+            PassphraseDialogFragment passphraseDialog = PassphraseDialogFragment.newInstance(this,
+                    messenger, secretKeyId);
+
+            passphraseDialog.show(getSupportFragmentManager(), "passphraseDialog");
+        } catch (PgpMain.PgpGeneralException e) {
+            Log.d(Constants.TAG, "No passphrase for this secret key, encrypt directly!");
+            // send message to handler to start encryption directly
+            returnHandler.sendEmptyMessage(PassphraseDialogFragment.MESSAGE_OKAY);
+        }
+    }
+}
diff --git a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/remote_api/IServiceActivityCallback.aidl b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/remote_api/IServiceActivityCallback.aidl
new file mode 100644
index 000000000..e9949e1ae
--- /dev/null
+++ b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/remote_api/IServiceActivityCallback.aidl
@@ -0,0 +1,26 @@
+/*
+ * 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.remote_api;
+
+
+interface IServiceActivityCallback {
+    
+    oneway void onRegistered(in boolean success, in String packageName);
+    
+    oneway void onCachedPassphrase(in boolean success);
+
+}
\ No newline at end of file
diff --git a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/remote_api/RegisteredAppsAdapter.java b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/remote_api/RegisteredAppsAdapter.java
new file mode 100644
index 000000000..9bf66a90a
--- /dev/null
+++ b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/remote_api/RegisteredAppsAdapter.java
@@ -0,0 +1,75 @@
+/*
+ * 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.remote_api;
+
+import org.sufficientlysecure.keychain.R;
+import org.sufficientlysecure.keychain.provider.KeychainContract.ApiApps;
+
+import android.content.Context;
+import android.content.pm.ApplicationInfo;
+import android.content.pm.PackageManager;
+import android.content.pm.PackageManager.NameNotFoundException;
+import android.database.Cursor;
+import android.support.v4.widget.CursorAdapter;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ImageView;
+import android.widget.TextView;
+
+public class RegisteredAppsAdapter extends CursorAdapter {
+
+    private LayoutInflater mInflater;
+    private PackageManager pm;
+
+    public RegisteredAppsAdapter(Context context, Cursor c, int flags) {
+        super(context, c, flags);
+
+        mInflater = LayoutInflater.from(context);
+        pm = context.getApplicationContext().getPackageManager();
+    }
+
+    @Override
+    public void bindView(View view, Context context, Cursor cursor) {
+        TextView text = (TextView) view.findViewById(R.id.api_apps_adapter_item_name);
+        ImageView icon = (ImageView) view.findViewById(R.id.api_apps_adapter_item_icon);
+
+        String packageName = cursor.getString(cursor.getColumnIndex(ApiApps.PACKAGE_NAME));
+        if (packageName != null) {
+            // get application name
+            try {
+                ApplicationInfo ai = pm.getApplicationInfo(packageName, 0);
+
+                text.setText(pm.getApplicationLabel(ai));
+                icon.setImageDrawable(pm.getApplicationIcon(ai));
+            } catch (final NameNotFoundException e) {
+                // fallback
+                text.setText(packageName);
+            }
+        } else {
+            // fallback
+            text.setText(packageName);
+        }
+
+    }
+
+    @Override
+    public View newView(Context context, Cursor cursor, ViewGroup parent) {
+        return mInflater.inflate(R.layout.api_apps_adapter_list_item, null);
+    }
+
+}
diff --git a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/remote_api/RegisteredAppsListActivity.java b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/remote_api/RegisteredAppsListActivity.java
new file mode 100644
index 000000000..f5487e2a3
--- /dev/null
+++ b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/remote_api/RegisteredAppsListActivity.java
@@ -0,0 +1,44 @@
+package org.sufficientlysecure.keychain.remote_api;
+
+import org.sufficientlysecure.keychain.R;
+import org.sufficientlysecure.keychain.ui.MainActivity;
+
+import com.actionbarsherlock.app.ActionBar;
+import com.actionbarsherlock.app.SherlockFragmentActivity;
+import com.actionbarsherlock.view.MenuItem;
+
+import android.content.Intent;
+import android.os.Bundle;
+
+public class RegisteredAppsListActivity extends SherlockFragmentActivity {
+    private ActionBar mActionBar;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        mActionBar = getSupportActionBar();
+
+        setContentView(R.layout.api_apps_list_activity);
+
+        mActionBar.setDisplayShowTitleEnabled(true);
+        mActionBar.setDisplayHomeAsUpEnabled(true);
+    }
+
+    /**
+     * Menu Options
+     */
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        switch (item.getItemId()) {
+        case android.R.id.home:
+            // app icon in Action Bar clicked; go home
+            Intent intent = new Intent(this, MainActivity.class);
+            intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
+            startActivity(intent);
+            return true;
+        default:
+            return super.onOptionsItemSelected(item);
+        }
+    }
+}
diff --git a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/remote_api/RegisteredAppsListFragment.java b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/remote_api/RegisteredAppsListFragment.java
new file mode 100644
index 000000000..d1e52a2d6
--- /dev/null
+++ b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/remote_api/RegisteredAppsListFragment.java
@@ -0,0 +1,90 @@
+package org.sufficientlysecure.keychain.remote_api;
+
+import org.sufficientlysecure.keychain.R;
+import org.sufficientlysecure.keychain.provider.KeychainContract;
+import org.sufficientlysecure.keychain.provider.KeychainContract.ApiApps;
+
+import android.content.ContentUris;
+import android.content.Intent;
+import android.database.Cursor;
+import android.net.Uri;
+import android.os.Bundle;
+import android.support.v4.app.LoaderManager;
+import android.support.v4.content.CursorLoader;
+import android.support.v4.content.Loader;
+import android.view.View;
+import android.widget.AdapterView;
+import android.widget.AdapterView.OnItemClickListener;
+
+import com.actionbarsherlock.app.SherlockListFragment;
+
+public class RegisteredAppsListFragment extends SherlockListFragment implements
+        LoaderManager.LoaderCallbacks<Cursor> {
+
+    // This is the Adapter being used to display the list's data.
+    RegisteredAppsAdapter mAdapter;
+
+    // If non-null, this is the current filter the user has provided.
+    String mCurFilter;
+
+    @Override
+    public void onActivityCreated(Bundle savedInstanceState) {
+        super.onActivityCreated(savedInstanceState);
+
+        getListView().setOnItemClickListener(new OnItemClickListener() {
+            @Override
+            public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) {
+                // edit app settings
+                Intent intent = new Intent(getActivity(), AppSettingsActivity.class);
+                intent.setData(ContentUris.withAppendedId(KeychainContract.ApiApps.CONTENT_URI, id));
+                startActivity(intent);
+            }
+        });
+
+        // Give some text to display if there is no data. In a real
+        // application this would come from a resource.
+        setEmptyText(getString(R.string.api_no_apps));
+
+        // We have a menu item to show in action bar.
+        setHasOptionsMenu(true);
+
+        // Create an empty adapter we will use to display the loaded data.
+        mAdapter = new RegisteredAppsAdapter(getActivity(), null, 0);
+        setListAdapter(mAdapter);
+
+        // Prepare the loader. Either re-connect with an existing one,
+        // or start a new one.
+        getLoaderManager().initLoader(0, null, this);
+    }
+
+    // These are the Contacts rows that we will retrieve.
+    static final String[] CONSUMERS_SUMMARY_PROJECTION = new String[] { ApiApps._ID,
+            ApiApps.PACKAGE_NAME };
+
+    public Loader<Cursor> onCreateLoader(int id, Bundle args) {
+        // This is called when a new Loader needs to be created. This
+        // sample only has one Loader, so we don't care about the ID.
+        // First, pick the base URI to use depending on whether we are
+        // currently filtering.
+        Uri baseUri = ApiApps.CONTENT_URI;
+
+        // Now create and return a CursorLoader that will take care of
+        // creating a Cursor for the data being displayed.
+        return new CursorLoader(getActivity(), baseUri, CONSUMERS_SUMMARY_PROJECTION, null, null,
+                ApiApps.PACKAGE_NAME + " COLLATE LOCALIZED ASC");
+    }
+
+    public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
+        // Swap the new cursor in. (The framework will take care of closing the
+        // old cursor once we return.)
+        mAdapter.swapCursor(data);
+    }
+
+    public void onLoaderReset(Loader<Cursor> loader) {
+        // This is called when the last Cursor provided to onLoadFinished()
+        // above is about to be closed. We need to make sure we are no
+        // longer using it.
+        mAdapter.swapCursor(null);
+    }
+
+}
\ No newline at end of file
diff --git a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/service/PassphraseCacheService.java b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/service/PassphraseCacheService.java
index d11b8e92a..343e5fbc3 100644
--- a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/service/PassphraseCacheService.java
+++ b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/service/PassphraseCacheService.java
@@ -48,6 +48,12 @@ import android.os.Messenger;
 import android.os.RemoteException;
 import android.util.Log;
 
+/**
+ * This service runs in its own process, but is available to all other processes as the main
+ * passphrase cache. Use the static methods addCachedPassphrase and getCachedPassphrase for
+ * convenience.
+ * 
+ */
 public class PassphraseCacheService extends Service {
     public static final String TAG = Constants.TAG + ": PassphraseCacheService";
 
@@ -74,9 +80,9 @@ public class PassphraseCacheService extends Service {
     Context mContext;
 
     /**
-     * This caches a new passphrase by sending a new command to the service. An android service is
-     * only run once. Thus, when the service is already started, new commands just add new events to
-     * the alarm manager for new passphrases to let them timeout in the future.
+     * This caches a new passphrase in memory by sending a new command to the service. An android
+     * service is only run once. Thus, when the service is already started, new commands just add
+     * new events to the alarm manager for new passphrases to let them timeout in the future.
      * 
      * @param context
      * @param keyId
@@ -95,21 +101,23 @@ public class PassphraseCacheService extends Service {
     }
 
     /**
-     * Gets a cached passphrase from memory, blocking method
+     * Gets a cached passphrase from memory by sending an intent to the service. This method is
+     * designed to wait until the service returns the passphrase.
      * 
      * @param context
      * @param keyId
-     * @return
+     * @return passphrase or null (if no passphrase is cached for this keyId)
      */
     public static String getCachedPassphrase(Context context, long keyId) {
         Log.d(TAG, "getCachedPassphrase() get masterKeyId for " + keyId);
+
         Intent intent = new Intent(context, PassphraseCacheService.class);
         intent.setAction(ACTION_PASSPHRASE_CACHE_GET);
 
         final Object mutex = new Object();
         final Bundle returnBundle = new Bundle();
 
-        HandlerThread handlerThread = new HandlerThread("getPassphrase");
+        HandlerThread handlerThread = new HandlerThread("getPassphraseThread");
         handlerThread.start();
         Handler returnHandler = new Handler(handlerThread.getLooper()) {
             @Override
@@ -121,6 +129,7 @@ public class PassphraseCacheService extends Service {
                 synchronized (mutex) {
                     mutex.notify();
                 }
+                // quit handlerThread
                 getLooper().quit();
             }
         };
@@ -147,6 +156,12 @@ public class PassphraseCacheService extends Service {
         }
     }
 
+    /**
+     * Internal implementation to get cached passphrase.
+     * 
+     * @param keyId
+     * @return
+     */
     private String getCachedPassphraseImpl(long keyId) {
         Log.d(TAG, "getCachedPassphraseImpl() get masterKeyId for " + keyId);
 
@@ -163,20 +178,20 @@ public class PassphraseCacheService extends Service {
             }
             masterKeyId = masterKey.getKeyID();
         }
-        Log.d(TAG, "getCachedPassphraseImpl() for masterKeyId" + masterKeyId);
+        Log.d(TAG, "getCachedPassphraseImpl() for masterKeyId " + masterKeyId);
 
         // get cached passphrase
         String cachedPassphrase = mPassphraseCache.get(masterKeyId);
         if (cachedPassphrase == null) {
-            // TODO: fix!
-            // check if secret key has a passphrase
-            // if (!hasPassphrase(context, masterKeyId)) {
-            // // cache empty passphrase
-            // addCachedPassphrase(context, masterKeyId, "");
-            // return "";
-            // } else {
-            return null;
-            // }
+            // if key has no passphrase -> cache and return empty passphrase
+            if (!hasPassphrase(this, masterKeyId)) {
+                Log.d(Constants.TAG, "Key has no passphrase! Caches and returns empty passphrase!");
+
+                addCachedPassphrase(this, masterKeyId, "");
+                return "";
+            } else {
+                return null;
+            }
         }
         // set it again to reset the cache life cycle
         Log.d(TAG, "Cache passphrase again when getting it!");
@@ -196,17 +211,10 @@ public class PassphraseCacheService extends Service {
         try {
             PGPSecretKey secretKey = PgpHelper.getMasterKey(ProviderHelper
                     .getPGPSecretKeyRingByKeyId(context, secretKeyId));
-
-            Log.d(Constants.TAG, "Check if key has no passphrase...");
             PBESecretKeyDecryptor keyDecryptor = new JcePBESecretKeyDecryptorBuilder().setProvider(
                     "SC").build("".toCharArray());
             PGPPrivateKey testKey = secretKey.extractPrivateKey(keyDecryptor);
             if (testKey != null) {
-                Log.d(Constants.TAG, "Key has no passphrase! Caches empty passphrase!");
-
-                // cache empty passphrase
-                PassphraseCacheService.addCachedPassphrase(context, secretKey.getKeyID(), "");
-
                 return false;
             }
         } catch (PGPException e) {
diff --git a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/ui/.SelectSecretKeyFragment.java.kate-swp b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/ui/.SelectSecretKeyFragment.java.kate-swp
new file mode 100644
index 000000000..c72aa8947
--- /dev/null
+++ b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/ui/.SelectSecretKeyFragment.java.kate-swp
diff --git a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/ui/MainActivity.java b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/ui/MainActivity.java
index 447801e55..3f5ca536f 100644
--- a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/ui/MainActivity.java
+++ b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/ui/MainActivity.java
@@ -19,6 +19,7 @@ package org.sufficientlysecure.keychain.ui;
 
 import org.sufficientlysecure.keychain.Id;
 import org.sufficientlysecure.keychain.R;
+import org.sufficientlysecure.keychain.remote_api.RegisteredAppsListActivity;
 
 import com.actionbarsherlock.app.ActionBar;
 import com.actionbarsherlock.app.SherlockActivity;
@@ -80,6 +81,9 @@ public class MainActivity extends SherlockActivity {
         menu.add(0, Id.menu.option.preferences, 0, R.string.menu_preferences)
                 .setIcon(R.drawable.ic_menu_settings)
                 .setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
+        menu.add(0, Id.menu.option.crypto_consumers, 0, R.string.menu_apiAppSettings)
+                .setIcon(R.drawable.ic_menu_settings)
+                .setShowAsAction(MenuItem.SHOW_AS_ACTION_WITH_TEXT);
         return true;
     }
 
@@ -91,6 +95,10 @@ public class MainActivity extends SherlockActivity {
             startActivity(new Intent(this, PreferencesActivity.class));
             return true;
 
+        case Id.menu.option.crypto_consumers:
+            startActivity(new Intent(this, RegisteredAppsListActivity.class));
+            return true;
+
         default:
             break;
 
diff --git a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/ui/SelectPublicKeyFragment.java b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/ui/SelectPublicKeyFragment.java
index 8b3e75d05..b9c42a17c 100644
--- a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/ui/SelectPublicKeyFragment.java
+++ b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/ui/SelectPublicKeyFragment.java
@@ -67,7 +67,7 @@ public class SelectPublicKeyFragment extends ListFragmentWorkaround implements
         // application this would come from a resource.
         setEmptyText(getString(R.string.listEmpty));
 
-        mAdapter = new SelectKeyCursorAdapter(mActivity, mListView, null, Id.type.public_key);
+        mAdapter = new SelectKeyCursorAdapter(mActivity, null, 0, mListView, Id.type.public_key);
 
         setListAdapter(mAdapter);
 
@@ -160,11 +160,12 @@ public class SelectPublicKeyFragment extends ListFragmentWorkaround implements
                         + SelectKeyCursorAdapter.PROJECTION_ROW_AVAILABLE,
                 "(SELECT COUNT(valid_keys." + Keys._ID + ") FROM " + Tables.KEYS
                         + " AS valid_keys WHERE valid_keys." + Keys.KEY_RING_ROW_ID + " = "
-                        + KeychainDatabase.Tables.KEY_RINGS + "." + KeyRings._ID + " AND valid_keys."
-                        + Keys.IS_REVOKED + " = '0' AND valid_keys." + Keys.CAN_ENCRYPT
-                        + " = '1' AND valid_keys." + Keys.CREATION + " <= '" + now + "' AND "
-                        + "(valid_keys." + Keys.EXPIRY + " IS NULL OR valid_keys." + Keys.EXPIRY
-                        + " >= '" + now + "')) AS " + SelectKeyCursorAdapter.PROJECTION_ROW_VALID, };
+                        + KeychainDatabase.Tables.KEY_RINGS + "." + KeyRings._ID
+                        + " AND valid_keys." + Keys.IS_REVOKED + " = '0' AND valid_keys."
+                        + Keys.CAN_ENCRYPT + " = '1' AND valid_keys." + Keys.CREATION + " <= '"
+                        + now + "' AND " + "(valid_keys." + Keys.EXPIRY + " IS NULL OR valid_keys."
+                        + Keys.EXPIRY + " >= '" + now + "')) AS "
+                        + SelectKeyCursorAdapter.PROJECTION_ROW_VALID, };
 
         String inMasterKeyList = null;
         if (mSelectedMasterKeyIds != null && mSelectedMasterKeyIds.length > 0) {
diff --git a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/ui/SelectSecretKeyFragment.java b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/ui/SelectSecretKeyFragment.java
index 4871b74bc..9b87f085c 100644
--- a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/ui/SelectSecretKeyFragment.java
+++ b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/ui/SelectSecretKeyFragment.java
@@ -73,7 +73,7 @@ public class SelectSecretKeyFragment extends SherlockListFragment implements
         // application this would come from a resource.
         setEmptyText(getString(R.string.listEmpty));
 
-        mAdapter = new SelectKeyCursorAdapter(mActivity, mListView, null, Id.type.secret_key);
+        mAdapter = new SelectKeyCursorAdapter(mActivity, null, 0, mListView, Id.type.secret_key);
 
         setListAdapter(mAdapter);
 
diff --git a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/ui/widget/ImportKeysListLoader.java b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/ui/widget/ImportKeysListLoader.java
index 198140e0c..94d578384 100644
--- a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/ui/widget/ImportKeysListLoader.java
+++ b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/ui/widget/ImportKeysListLoader.java
@@ -23,19 +23,14 @@ import java.io.FileNotFoundException;
 import java.io.InputStream;
 import java.util.ArrayList;
 import java.util.HashMap;
-import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
 
 import org.spongycastle.openpgp.PGPKeyRing;
 import org.spongycastle.openpgp.PGPObjectFactory;
-import org.spongycastle.openpgp.PGPPublicKeyRing;
-import org.spongycastle.openpgp.PGPPublicKeyRingCollection;
 import org.spongycastle.openpgp.PGPSecretKeyRing;
-import org.spongycastle.openpgp.PGPSecretKeyRingCollection;
 import org.spongycastle.openpgp.PGPUtil;
 import org.sufficientlysecure.keychain.Constants;
-import org.sufficientlysecure.keychain.helper.PgpConversionHelper;
 import org.sufficientlysecure.keychain.helper.PgpHelper;
 import org.sufficientlysecure.keychain.util.InputData;
 import org.sufficientlysecure.keychain.util.Log;
@@ -45,11 +40,6 @@ import org.sufficientlysecure.keychain.R;
 import android.content.Context;
 import android.support.v4.content.AsyncTaskLoader;
 
-/**
- * A custom Loader to search for bad adware apps, based on
- * https://github.com/brosmike/AirPush-Detector. Daniel Bjorge licensed it under Apachev2 after
- * asking him by mail.
- */
 public class ImportKeysListLoader extends AsyncTaskLoader<List<Map<String, String>>> {
     public static final String MAP_ATTR_USER_ID = "user_id";
     public static final String MAP_ATTR_FINGERPINT = "fingerprint";
diff --git a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/ui/widget/SelectKeyCursorAdapter.java b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/ui/widget/SelectKeyCursorAdapter.java
index 17423136f..5d8b7d1b1 100644
--- a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/ui/widget/SelectKeyCursorAdapter.java
+++ b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/ui/widget/SelectKeyCursorAdapter.java
@@ -44,9 +44,9 @@ public class SelectKeyCursorAdapter extends CursorAdapter {
     public final static String PROJECTION_ROW_AVAILABLE = "available";
     public final static String PROJECTION_ROW_VALID = "valid";
 
-    @SuppressWarnings("deprecation")
-    public SelectKeyCursorAdapter(Context context, ListView listView, Cursor c, int keyType) {
-        super(context, c);
+    public SelectKeyCursorAdapter(Context context, Cursor c, int flags, ListView listView,
+            int keyType) {
+        super(context, c, flags);
 
         mInflater = LayoutInflater.from(context);
         mListView = listView;
@@ -65,8 +65,7 @@ public class SelectKeyCursorAdapter extends CursorAdapter {
 
     @Override
     public void bindView(View view, Context context, Cursor cursor) {
-        boolean valid = cursor.getInt(cursor
-                .getColumnIndex(PROJECTION_ROW_VALID)) > 0;
+        boolean valid = cursor.getInt(cursor.getColumnIndex(PROJECTION_ROW_VALID)) > 0;
 
         TextView mainUserId = (TextView) view.findViewById(R.id.mainUserId);
         mainUserId.setText(R.string.unknownUserId);
@@ -101,8 +100,7 @@ public class SelectKeyCursorAdapter extends CursorAdapter {
                 status.setText(R.string.canSign);
             }
         } else {
-            if (cursor.getInt(cursor
-                    .getColumnIndex(PROJECTION_ROW_AVAILABLE)) > 0) {
+            if (cursor.getInt(cursor.getColumnIndex(PROJECTION_ROW_AVAILABLE)) > 0) {
                 // has some CAN_ENCRYPT keys, but col(ROW_VALID) = 0, so must be revoked or
                 // expired
                 status.setText(R.string.expired);
diff --git a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/util/PausableThreadPoolExecutor.java b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/util/PausableThreadPoolExecutor.java
new file mode 100644
index 000000000..d6170a4e2
--- /dev/null
+++ b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/util/PausableThreadPoolExecutor.java
@@ -0,0 +1,89 @@
+/*
+ * 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.util;
+
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.RejectedExecutionHandler;
+import java.util.concurrent.ThreadFactory;
+import java.util.concurrent.ThreadPoolExecutor;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.locks.Condition;
+import java.util.concurrent.locks.ReentrantLock;
+
+/**
+ * Example from
+ * http://docs.oracle.com/javase/1.5.0/docs/api/java/util/concurrent/ThreadPoolExecutor.html
+ */
+public class PausableThreadPoolExecutor extends ThreadPoolExecutor {
+
+    public PausableThreadPoolExecutor(int corePoolSize, int maximumPoolSize, long keepAliveTime,
+            TimeUnit unit, BlockingQueue<Runnable> workQueue, RejectedExecutionHandler handler) {
+        super(corePoolSize, maximumPoolSize, keepAliveTime, unit, workQueue, handler);
+    }
+
+    public PausableThreadPoolExecutor(int corePoolSize, int maximumPoolSize, long keepAliveTime,
+            TimeUnit unit, BlockingQueue<Runnable> workQueue, ThreadFactory threadFactory,
+            RejectedExecutionHandler handler) {
+        super(corePoolSize, maximumPoolSize, keepAliveTime, unit, workQueue, threadFactory, handler);
+    }
+
+    public PausableThreadPoolExecutor(int corePoolSize, int maximumPoolSize, long keepAliveTime,
+            TimeUnit unit, BlockingQueue<Runnable> workQueue, ThreadFactory threadFactory) {
+        super(corePoolSize, maximumPoolSize, keepAliveTime, unit, workQueue, threadFactory);
+    }
+
+    public PausableThreadPoolExecutor(int corePoolSize, int maximumPoolSize, long keepAliveTime,
+            TimeUnit unit, BlockingQueue<Runnable> workQueue) {
+        super(corePoolSize, maximumPoolSize, keepAliveTime, unit, workQueue);
+    }
+
+    private boolean isPaused;
+    private ReentrantLock pauseLock = new ReentrantLock();
+    private Condition unpaused = pauseLock.newCondition();
+
+    protected void beforeExecute(Thread t, Runnable r) {
+        super.beforeExecute(t, r);
+        pauseLock.lock();
+        try {
+            while (isPaused)
+                unpaused.await();
+        } catch (InterruptedException ie) {
+            t.interrupt();
+        } finally {
+            pauseLock.unlock();
+        }
+    }
+
+    public void pause() {
+        pauseLock.lock();
+        try {
+            isPaused = true;
+        } finally {
+            pauseLock.unlock();
+        }
+    }
+
+    public void resume() {
+        pauseLock.lock();
+        try {
+            isPaused = false;
+            unpaused.signalAll();
+        } finally {
+            pauseLock.unlock();
+        }
+    }
+}
\ No newline at end of file