Introducing new ParcelFileDescriptor pipes

39 files changed, 958 insertions, 362 deletions

diff --git a/OpenPGP-Keychain-API/example-app/build.gradle b/OpenPGP-Keychain-API/example-app/build.gradle
index 99a09f094..373f83690 100644
--- a/OpenPGP-Keychain-API/example-app/build.gradle
+++ b/OpenPGP-Keychain-API/example-app/build.gradle
@@ -1,3 +1,4 @@
+// please leave this here, so this library builds on its own
 buildscript {
     repositories {
         mavenCentral()
@@ -20,7 +21,7 @@ android {
     buildToolsVersion "19.0.1"
 
     defaultConfig {
-        minSdkVersion 8
+        minSdkVersion 9
         targetSdkVersion 19
     }
 
diff --git a/OpenPGP-Keychain-API/example-app/src/main/AndroidManifest.xml b/OpenPGP-Keychain-API/example-app/src/main/AndroidManifest.xml
index 8b8c43776..39a990f72 100644
--- a/OpenPGP-Keychain-API/example-app/src/main/AndroidManifest.xml
+++ b/OpenPGP-Keychain-API/example-app/src/main/AndroidManifest.xml
@@ -5,7 +5,7 @@
     android:versionName="1.1" >
 
     <uses-sdk
-        android:minSdkVersion="8"
+        android:minSdkVersion="9"
         android:targetSdkVersion="19" />
 
     <application
diff --git a/OpenPGP-Keychain-API/example-app/src/main/java/org/sufficientlysecure/keychain/demo/OpenPgpProviderActivity.java b/OpenPGP-Keychain-API/example-app/src/main/java/org/sufficientlysecure/keychain/demo/OpenPgpProviderActivity.java
index 4a96de5a1..81f9eee68 100644
--- a/OpenPGP-Keychain-API/example-app/src/main/java/org/sufficientlysecure/keychain/demo/OpenPgpProviderActivity.java
+++ b/OpenPGP-Keychain-API/example-app/src/main/java/org/sufficientlysecure/keychain/demo/OpenPgpProviderActivity.java
@@ -16,17 +16,6 @@
 
 package org.sufficientlysecure.keychain.demo;
 
-import java.util.ArrayList;
-import java.util.List;
-
-import org.openintents.openpgp.IOpenPgpKeyIdsCallback;
-import org.openintents.openpgp.OpenPgpData;
-import org.openintents.openpgp.OpenPgpError;
-import org.openintents.openpgp.OpenPgpServiceConnection;
-import org.openintents.openpgp.OpenPgpSignatureResult;
-import org.openintents.openpgp.IOpenPgpCallback;
-import org.openintents.openpgp.IOpenPgpService;
-
 import android.app.Activity;
 import android.app.AlertDialog;
 import android.content.DialogInterface;
@@ -34,7 +23,6 @@ import android.content.Intent;
 import android.content.pm.ResolveInfo;
 import android.graphics.drawable.Drawable;
 import android.os.Bundle;
-import android.os.RemoteException;
 import android.util.Log;
 import android.view.View;
 import android.view.ViewGroup;
@@ -44,6 +32,19 @@ import android.widget.ListAdapter;
 import android.widget.TextView;
 import android.widget.Toast;
 
+import org.openintents.openpgp.IOpenPgpService;
+import org.openintents.openpgp.OpenPgpError;
+import org.openintents.openpgp.util.OpenPgpApi;
+import org.openintents.openpgp.util.OpenPgpConstants;
+import org.openintents.openpgp.util.OpenPgpServiceConnection;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.InputStream;
+import java.io.UnsupportedEncodingException;
+import java.util.ArrayList;
+import java.util.List;
+
 public class OpenPgpProviderActivity extends Activity {
     Activity mActivity;
 
@@ -67,123 +68,123 @@ public class OpenPgpProviderActivity extends Activity {
         selectCryptoProvider();
     }
 
-    /**
-     * Callback from remote openpgp service
-     */
-    final IOpenPgpKeyIdsCallback.Stub getKeysEncryptCallback = new IOpenPgpKeyIdsCallback.Stub() {
-
-        @Override
-        public void onSuccess(final long[] keyIds) throws RemoteException {
-            Log.d(Constants.TAG, "getKeysEncryptCallback keyId " + keyIds[0]);
-            mActivity.runOnUiThread(new Runnable() {
-
-                @Override
-                public void run() {
-                    // encrypt after getting key ids
-                    String inputStr = mMessage.getText().toString();
-                    OpenPgpData input = new OpenPgpData(inputStr);
-
-                    Log.d(Constants.TAG, "getKeysEncryptCallback inputStr " + inputStr);
-
-                    try {
-                        mCryptoServiceConnection.getService().encrypt(input,
-                                new OpenPgpData(OpenPgpData.TYPE_STRING), keyIds, encryptCallback);
-                    } catch (RemoteException e) {
-                        Log.e(Constants.TAG, "CryptoProviderDemo", e);
-                    }
-                }
-            });
-        }
-
-        @Override
-        public void onError(OpenPgpError error) throws RemoteException {
-            handleError(error);
-        }
-
-    };
-
-    final IOpenPgpKeyIdsCallback.Stub getKeysSignAndEncryptCallback = new IOpenPgpKeyIdsCallback.Stub() {
-
-        @Override
-        public void onSuccess(final long[] keyIds) throws RemoteException {
-            Log.d(Constants.TAG, "getKeysSignAndEncryptCallback keyId " + keyIds[0]);
-
-            mActivity.runOnUiThread(new Runnable() {
-
-                @Override
-                public void run() {
-                    // encrypt after getting key ids
-                    String inputStr = mMessage.getText().toString();
-                    OpenPgpData input = new OpenPgpData(inputStr);
-
-                    try {
-                        mCryptoServiceConnection.getService().signAndEncrypt(input,
-                                new OpenPgpData(OpenPgpData.TYPE_STRING), keyIds, encryptCallback);
-                    } catch (RemoteException e) {
-                        Log.e(Constants.TAG, "CryptoProviderDemo", e);
-                    }
-                }
-            });
-        }
-
-        @Override
-        public void onError(OpenPgpError error) throws RemoteException {
-            handleError(error);
-        }
-
-    };
-
-    final IOpenPgpCallback.Stub encryptCallback = new IOpenPgpCallback.Stub() {
-
-        @Override
-        public void onSuccess(final OpenPgpData output, OpenPgpSignatureResult signatureResult)
-                throws RemoteException {
-            Log.d(Constants.TAG, "encryptCallback");
-
-            runOnUiThread(new Runnable() {
-
-                @Override
-                public void run() {
-                    mCiphertext.setText(output.getString());
-                }
-            });
-        }
-
-        @Override
-        public void onError(OpenPgpError error) throws RemoteException {
-            handleError(error);
-        }
-
-    };
-
-    final IOpenPgpCallback.Stub decryptAndVerifyCallback = new IOpenPgpCallback.Stub() {
-
-        @Override
-        public void onSuccess(final OpenPgpData output, final OpenPgpSignatureResult signatureResult)
-                throws RemoteException {
-            Log.d(Constants.TAG, "decryptAndVerifyCallback");
-
-            runOnUiThread(new Runnable() {
-
-                @Override
-                public void run() {
-                    mMessage.setText(output.getString());
-                    if (signatureResult != null) {
-                        Toast.makeText(OpenPgpProviderActivity.this,
-                                "signature result:\n" + signatureResult.toString(),
-                                Toast.LENGTH_LONG).show();
-                    }
-                }
-            });
-
-        }
-
-        @Override
-        public void onError(OpenPgpError error) throws RemoteException {
-            handleError(error);
-        }
-
-    };
+//    /**
+//     * Callback from remote openpgp service
+//     */
+//    final IOpenPgpKeyIdsCallback.Stub getKeysEncryptCallback = new IOpenPgpKeyIdsCallback.Stub() {
+//
+//        @Override
+//        public void onSuccess(final long[] keyIds) throws RemoteException {
+//            Log.d(Constants.TAG, "getKeysEncryptCallback keyId " + keyIds[0]);
+//            mActivity.runOnUiThread(new Runnable() {
+//
+//                @Override
+//                public void run() {
+//                    // encrypt after getting key ids
+//                    String inputStr = mMessage.getText().toString();
+//                    OpenPgpData input = new OpenPgpData(inputStr);
+//
+//                    Log.d(Constants.TAG, "getKeysEncryptCallback inputStr " + inputStr);
+//
+//                    try {
+//                        mCryptoServiceConnection.getService().encrypt(input,
+//                                new OpenPgpData(OpenPgpData.TYPE_STRING), keyIds, encryptCallback);
+//                    } catch (RemoteException e) {
+//                        Log.e(Constants.TAG, "CryptoProviderDemo", e);
+//                    }
+//                }
+//            });
+//        }
+//
+//        @Override
+//        public void onError(OpenPgpError error) throws RemoteException {
+//            handleError(error);
+//        }
+//
+//    };
+//
+//    final IOpenPgpKeyIdsCallback.Stub getKeysSignAndEncryptCallback = new IOpenPgpKeyIdsCallback.Stub() {
+//
+//        @Override
+//        public void onSuccess(final long[] keyIds) throws RemoteException {
+//            Log.d(Constants.TAG, "getKeysSignAndEncryptCallback keyId " + keyIds[0]);
+//
+//            mActivity.runOnUiThread(new Runnable() {
+//
+//                @Override
+//                public void run() {
+//                    // encrypt after getting key ids
+//                    String inputStr = mMessage.getText().toString();
+//                    OpenPgpData input = new OpenPgpData(inputStr);
+//
+//                    try {
+//                        mCryptoServiceConnection.getService().signAndEncrypt(input,
+//                                new OpenPgpData(OpenPgpData.TYPE_STRING), keyIds, encryptCallback);
+//                    } catch (RemoteException e) {
+//                        Log.e(Constants.TAG, "CryptoProviderDemo", e);
+//                    }
+//                }
+//            });
+//        }
+//
+//        @Override
+//        public void onError(OpenPgpError error) throws RemoteException {
+//            handleError(error);
+//        }
+//
+//    };
+//
+//    final IOpenPgpCallback.Stub encryptCallback = new IOpenPgpCallback.Stub() {
+//
+//        @Override
+//        public void onSuccess(final OpenPgpData output, OpenPgpSignatureResult signatureResult)
+//                throws RemoteException {
+//            Log.d(Constants.TAG, "encryptCallback");
+//
+//            runOnUiThread(new Runnable() {
+//
+//                @Override
+//                public void run() {
+//                    mCiphertext.setText(output.getString());
+//                }
+//            });
+//        }
+//
+//        @Override
+//        public void onError(OpenPgpError error) throws RemoteException {
+//            handleError(error);
+//        }
+//
+//    };
+//
+//    final IOpenPgpCallback.Stub decryptAndVerifyCallback = new IOpenPgpCallback.Stub() {
+//
+//        @Override
+//        public void onSuccess(final OpenPgpData output, final OpenPgpSignatureResult signatureResult)
+//                throws RemoteException {
+//            Log.d(Constants.TAG, "decryptAndVerifyCallback");
+//
+//            runOnUiThread(new Runnable() {
+//
+//                @Override
+//                public void run() {
+//                    mMessage.setText(output.getString());
+//                    if (signatureResult != null) {
+//                        Toast.makeText(OpenPgpProviderActivity.this,
+//                                "signature result:\n" + signatureResult.toString(),
+//                                Toast.LENGTH_LONG).show();
+//                    }
+//                }
+//            });
+//
+//        }
+//
+//        @Override
+//        public void onError(OpenPgpError error) throws RemoteException {
+//            handleError(error);
+//        }
+//
+//    };
 
     private void handleError(final OpenPgpError error) {
         mActivity.runOnUiThread(new Runnable() {
@@ -200,46 +201,61 @@ public class OpenPgpProviderActivity extends Activity {
     }
 
     public void encryptOnClick(View view) {
-        try {
-            mCryptoServiceConnection.getService().getKeyIds(
-                    mEncryptUserIds.getText().toString().split(","), true, getKeysEncryptCallback);
-        } catch (RemoteException e) {
-            Log.e(Constants.TAG, "CryptoProviderDemo", e);
-        }
+//        try {
+//            mCryptoServiceConnection.getService().getKeyIds(
+//                    mEncryptUserIds.getText().toString().split(","), true, getKeysEncryptCallback);
+//        } catch (RemoteException e) {
+//            Log.e(Constants.TAG, "CryptoProviderDemo", e);
+//        }
     }
 
     public void signOnClick(View view) {
-        String inputStr = mMessage.getText().toString();
-        OpenPgpData input = new OpenPgpData(inputStr);
-
         try {
-            mCryptoServiceConnection.getService().sign(input,
-                    new OpenPgpData(OpenPgpData.TYPE_STRING), encryptCallback);
-        } catch (RemoteException e) {
-            Log.e(Constants.TAG, "CryptoProviderDemo", e);
+            String inputStr = mMessage.getText().toString();
+            InputStream is = new ByteArrayInputStream(inputStr.getBytes("UTF-8"));
+
+            final ByteArrayOutputStream os = new ByteArrayOutputStream();
+
+            OpenPgpApi api = new OpenPgpApi(mCryptoServiceConnection.getService());
+            api.sign(is, os);
+
+            Log.d(OpenPgpConstants.TAG, "Test #1 read result: " + os.toByteArray().length
+                    + " str=" + os.toString("UTF-8"));
+
+            mCiphertext.setText(os.toString("UTF-8"));
+        } catch (UnsupportedEncodingException e) {
+            e.printStackTrace();
         }
+//        OpenPgpData input = new OpenPgpData(inputStr);
+//
+//        try {
+//            mCryptoServiceConnection.getService().sign(input,
+//                    new OpenPgpData(OpenPgpData.TYPE_STRING), encryptCallback);
+//        } catch (RemoteException e) {
+//            Log.e(Constants.TAG, "CryptoProviderDemo", e);
+//        }
     }
 
     public void signAndEncryptOnClick(View view) {
-        try {
-            mCryptoServiceConnection.getService().getKeyIds(
-                    mEncryptUserIds.getText().toString().split(","), true,
-                    getKeysSignAndEncryptCallback);
-        } catch (RemoteException e) {
-            Log.e(Constants.TAG, "CryptoProviderDemo", e);
-        }
+//        try {
+//            mCryptoServiceConnection.getService().getKeyIds(
+//                    mEncryptUserIds.getText().toString().split(","), true,
+//                    getKeysSignAndEncryptCallback);
+//        } catch (RemoteException e) {
+//            Log.e(Constants.TAG, "CryptoProviderDemo", e);
+//        }
     }
 
     public void decryptAndVerifyOnClick(View view) {
-        String inputStr = mCiphertext.getText().toString();
-        OpenPgpData input = new OpenPgpData(inputStr);
-
-        try {
-            mCryptoServiceConnection.getService().decryptAndVerify(input,
-                    new OpenPgpData(OpenPgpData.TYPE_STRING), decryptAndVerifyCallback);
-        } catch (RemoteException e) {
-            Log.e(Constants.TAG, "CryptoProviderDemo", e);
-        }
+//        String inputStr = mCiphertext.getText().toString();
+//        OpenPgpData input = new OpenPgpData(inputStr);
+//
+//        try {
+//            mCryptoServiceConnection.getService().decryptAndVerify(input,
+//                    new OpenPgpData(OpenPgpData.TYPE_STRING), decryptAndVerifyCallback);
+//        } catch (RemoteException e) {
+//            Log.e(Constants.TAG, "CryptoProviderDemo", e);
+//        }
     }
 
     @Override
diff --git a/OpenPGP-Keychain-API/example-app/src/main/res/xml/base_preference.xml b/OpenPGP-Keychain-API/example-app/src/main/res/xml/base_preference.xml
index 5febfad44..86b461742 100644
--- a/OpenPGP-Keychain-API/example-app/src/main/res/xml/base_preference.xml
+++ b/OpenPGP-Keychain-API/example-app/src/main/res/xml/base_preference.xml
@@ -12,7 +12,7 @@
     <!-- android:title="AIDL Demo (ACCESS_KEYS permission)" /> -->
     <!-- </PreferenceCategory> -->
     <PreferenceCategory android:title="OpenPGP Provider" >
-        <org.openintents.openpgp.OpenPgpListPreference
+        <org.openintents.openpgp.util.OpenPgpListPreference
             android:key="openpgp_provider_list"
             android:title="Select OpenPGP Provider!" />
         <Preference
diff --git a/OpenPGP-Keychain-API/gradle/wrapper/gradle-wrapper.properties b/OpenPGP-Keychain-API/gradle/wrapper/gradle-wrapper.properties
index 425cd64c7..932184188 100644
--- a/OpenPGP-Keychain-API/gradle/wrapper/gradle-wrapper.properties
+++ b/OpenPGP-Keychain-API/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Sun Feb 09 19:10:32 CET 2014
+#Fri Feb 14 01:26:40 CET 2014
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=http\://services.gradle.org/distributions/gradle-1.10-bin.zip
+distributionUrl=http\://services.gradle.org/distributions/gradle-1.10-all.zip
diff --git a/OpenPGP-Keychain-API/libraries/keychain-api-library/build.gradle b/OpenPGP-Keychain-API/libraries/keychain-api-library/build.gradle
index 2eacd2065..f9da72cb8 100644
--- a/OpenPGP-Keychain-API/libraries/keychain-api-library/build.gradle
+++ b/OpenPGP-Keychain-API/libraries/keychain-api-library/build.gradle
@@ -1,3 +1,4 @@
+// please leave this here, so this library builds on its own
 buildscript {
     repositories {
         mavenCentral()
diff --git a/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/AndroidManifest.xml b/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/AndroidManifest.xml
index 32b4a82e5..768922c22 100644
--- a/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/AndroidManifest.xml
+++ b/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/AndroidManifest.xml
@@ -5,7 +5,7 @@
     android:versionName="1.0" >
 
     <uses-sdk
-        android:minSdkVersion="8"
+        android:minSdkVersion="9"
         android:targetSdkVersion="19" />
 
     <application/>
diff --git a/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/aidl/org/openintents/openpgp/IOpenPgpKeyIdsCallback.aidl b/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/aidl/org/openintents/openpgp/IOpenPgpKeyIdsCallback.aidl
index 4ca356fad..f9b5fc453 100644
--- a/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/aidl/org/openintents/openpgp/IOpenPgpKeyIdsCallback.aidl
+++ b/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/aidl/org/openintents/openpgp/IOpenPgpKeyIdsCallback.aidl
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013 Dominik Schürmann <dominik@dominikschuermann.de>
+ * Copyright (C) 2014 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.
diff --git a/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/aidl/org/openintents/openpgp/IOpenPgpService.aidl b/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/aidl/org/openintents/openpgp/IOpenPgpService.aidl
index 8f9e8a0fd..ef390a7f6 100644
--- a/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/aidl/org/openintents/openpgp/IOpenPgpService.aidl
+++ b/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/aidl/org/openintents/openpgp/IOpenPgpService.aidl
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013 Dominik Schürmann <dominik@dominikschuermann.de>
+ * Copyright (C) 2014 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.
@@ -20,13 +20,36 @@ import org.openintents.openpgp.OpenPgpData;
 import org.openintents.openpgp.IOpenPgpCallback;
 import org.openintents.openpgp.IOpenPgpKeyIdsCallback;
 
-/**
- * All methods are oneway, which means they are asynchronous and non-blocking.
- * Results are returned to the callback, which has to be implemented on client side.
- */
 interface IOpenPgpService {
 
     /**
+     * Bundle params:
+     * api_version 1,2,3,... (current: 1)
+     * ascii_armor true/false (for output)
+     * key_ids long[] (for encrypt method)
+     *
+     *
+     * Bundle return:
+     * result_code RESULT_ERROR=0 (see error), RESULT_OK=1, RESULT_USER_INTERACTION_REQUIRED=2 (execute intent and do it again with params from intent)
+     * signature_result OpenPgpSignatureResult
+     * error OpenPgpError
+     * intent Intent
+     *
+     */
+
+    Bundle sign(in Bundle params, in ParcelFileDescriptor input, in ParcelFileDescriptor output);
+
+    Bundle encrypt(in Bundle params, in ParcelFileDescriptor input, in ParcelFileDescriptor output);
+
+    Bundle signAndEncrypt(in Bundle params, in ParcelFileDescriptor input, in ParcelFileDescriptor output);
+
+    Bundle decryptAndVerify(in Bundle params, in ParcelFileDescriptor input, in ParcelFileDescriptor output);
+
+
+/*
+    ------------------OLD--------------------------
+*/
+    /**
      * Sign
      * 
      * After successful signing, callback's onSuccess will contain the resulting output.
@@ -48,8 +71,9 @@ interface IOpenPgpService {
      * @param callback
      *            Callback where to return results
      */
-    oneway void sign(in OpenPgpData input, in OpenPgpData output, in IOpenPgpCallback callback);
-    
+    //oneway void sign(in OpenPgpData input, in OpenPgpData output, in IOpenPgpCallback callback);
+
+
     /**
      * Encrypt
      * 
@@ -74,7 +98,7 @@ interface IOpenPgpService {
      * @param callback
      *            Callback where to return results
      */
-    oneway void encrypt(in OpenPgpData input, in OpenPgpData output, in long[] keyIds, in IOpenPgpCallback callback);
+    //oneway void encrypt(in OpenPgpData input, in OpenPgpData output, in long[] keyIds, in IOpenPgpCallback callback);
     
     /**
      * Sign then encrypt
@@ -100,7 +124,7 @@ interface IOpenPgpService {
      * @param callback
      *            Callback where to return results
      */
-    oneway void signAndEncrypt(in OpenPgpData input, in OpenPgpData output, in long[] keyIds, in IOpenPgpCallback callback);
+    //oneway void signAndEncrypt(in OpenPgpData input, in OpenPgpData output, in long[] keyIds, in IOpenPgpCallback callback);
     
     /**
      * Decrypts and verifies given input bytes. This methods handles encrypted-only, signed-and-encrypted,
@@ -126,7 +150,7 @@ interface IOpenPgpService {
      * @param callback
      *            Callback where to return results
      */
-    oneway void decryptAndVerify(in OpenPgpData input, in OpenPgpData output, in IOpenPgpCallback callback);
+    //oneway void decryptAndVerify(in OpenPgpData input, in OpenPgpData output, in IOpenPgpCallback callback);
     
     /**
      * Get available key ids based on given user ids
@@ -138,6 +162,6 @@ interface IOpenPgpService {
      * @param callback
      *            Callback where to return results (different type than callback in other functions!)
      */
-    oneway void getKeyIds(in String[] ids, in boolean allowUserInteraction, in IOpenPgpKeyIdsCallback callback);
+    //oneway void getKeyIds(in String[] ids, in boolean allowUserInteraction, in IOpenPgpKeyIdsCallback callback);
     
 }
\ No newline at end of file
diff --git a/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/aidl/org/openintents/openpgp/OpenPgpError.aidl b/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/aidl/org/openintents/openpgp/OpenPgpError.aidl
index 7a6bed1e6..7f867653d 100644
--- a/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/aidl/org/openintents/openpgp/OpenPgpError.aidl
+++ b/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/aidl/org/openintents/openpgp/OpenPgpError.aidl
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013 Dominik Schürmann <dominik@dominikschuermann.de>
+ * Copyright (C) 2014 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.
diff --git a/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/aidl/org/openintents/openpgp/OpenPgpSignatureResult.aidl b/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/aidl/org/openintents/openpgp/OpenPgpSignatureResult.aidl
index e246792d0..d1d138b30 100644
--- a/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/aidl/org/openintents/openpgp/OpenPgpSignatureResult.aidl
+++ b/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/aidl/org/openintents/openpgp/OpenPgpSignatureResult.aidl
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013 Dominik Schürmann <dominik@dominikschuermann.de>
+ * Copyright (C) 2014 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.
diff --git a/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/OpenPgpConstants.java b/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/OpenPgpConstants.java
deleted file mode 100644
index b1ca1bfe6..000000000
--- a/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/OpenPgpConstants.java
+++ /dev/null
@@ -1,10 +0,0 @@
-package org.openintents.openpgp;
-
-public class OpenPgpConstants {
-
-    public static final String TAG = "OpenPgp API";
-
-    public static final int REQUIRED_API_VERSION = 1;
-    public static final String SERVICE_INTENT = "org.openintents.openpgp.IOpenPgpService";
-
-}
diff --git a/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/OpenPgpError.java b/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/OpenPgpError.java
index f108d3169..4dd2cc641 100644
--- a/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/OpenPgpError.java
+++ b/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/OpenPgpError.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013 Dominik Schürmann <dominik@dominikschuermann.de>
+ * Copyright (C) 2014 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.
@@ -20,10 +20,13 @@ import android.os.Parcel;
 import android.os.Parcelable;
 
 public class OpenPgpError implements Parcelable {
+    public static final int CLIENT_SIDE_ERROR = -1;
+
     public static final int GENERIC_ERROR = 0;
-    public static final int NO_OR_WRONG_PASSPHRASE = 1;
-    public static final int NO_USER_IDS = 2;
-    public static final int USER_INTERACTION_REQUIRED = 3;
+    public static final int INCOMPATIBLE_API_VERSIONS = 1;
+
+    public static final int NO_OR_WRONG_PASSPHRASE = 2;
+    public static final int NO_USER_IDS = 3;
 
     int errorId;
     String message;
diff --git a/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/OpenPgpSignatureResult.java b/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/OpenPgpSignatureResult.java
index 829f8f8cf..226eeacc2 100644
--- a/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/OpenPgpSignatureResult.java
+++ b/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/OpenPgpSignatureResult.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013 Dominik Schürmann <dominik@dominikschuermann.de>
+ * Copyright (C) 2014 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.
diff --git a/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/util/OpenPgpApi.java b/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/util/OpenPgpApi.java
new file mode 100644
index 000000000..6efb507c4
--- /dev/null
+++ b/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/util/OpenPgpApi.java
@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2014 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.openintents.openpgp.util;
+
+import android.os.Bundle;
+import android.os.ParcelFileDescriptor;
+import android.os.RemoteException;
+import android.util.Log;
+
+import org.openintents.openpgp.IOpenPgpService;
+import org.openintents.openpgp.OpenPgpError;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+public class OpenPgpApi {
+
+    IOpenPgpService mService;
+
+    public OpenPgpApi(IOpenPgpService service) {
+        this.mService = service;
+    }
+
+    public Bundle sign(InputStream is, final OutputStream os) {
+        try {
+            // send the input and output pfds
+            ParcelFileDescriptor input = ParcelFileDescriptorUtil.pipeFrom(is,
+                    new ParcelFileDescriptorUtil.IThreadListener() {
+
+                        @Override
+                        public void onThreadFinished(Thread thread) {
+                            Log.d(OpenPgpConstants.TAG, "Copy to service finished");
+                        }
+                    });
+            ParcelFileDescriptor output = ParcelFileDescriptorUtil.pipeTo(os,
+                    new ParcelFileDescriptorUtil.IThreadListener() {
+
+                        @Override
+                        public void onThreadFinished(Thread thread) {
+                            Log.d(OpenPgpConstants.TAG, "Service finished writing!");
+                        }
+                    });
+
+            // blocks until result is ready
+            Bundle result = mService.sign(null, input, output);
+            // close() is required to halt the TransferThread
+            output.close();
+
+            return result;
+        } catch (RemoteException e) {
+            Log.e(OpenPgpConstants.TAG, "RemoteException", e);
+            Bundle result = new Bundle();
+            result.putInt(OpenPgpConstants.RESULT_CODE, OpenPgpConstants.RESULT_CODE_ERROR);
+            result.putParcelable(OpenPgpConstants.RESULT_ERRORS,
+                    new OpenPgpError(OpenPgpError.CLIENT_SIDE_ERROR, e.getMessage()));
+            return result;
+        } catch (IOException e) {
+            Log.e(OpenPgpConstants.TAG, "IOException", e);
+            Bundle result = new Bundle();
+            result.putInt(OpenPgpConstants.RESULT_CODE, OpenPgpConstants.RESULT_CODE_ERROR);
+            result.putParcelable(OpenPgpConstants.RESULT_ERRORS,
+                    new OpenPgpError(OpenPgpError.CLIENT_SIDE_ERROR, e.getMessage()));
+            return result;
+        }
+    }
+
+
+}
diff --git a/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/util/OpenPgpConstants.java b/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/util/OpenPgpConstants.java
new file mode 100644
index 000000000..3dd9391d0
--- /dev/null
+++ b/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/util/OpenPgpConstants.java
@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2014 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.openintents.openpgp.util;
+
+public class OpenPgpConstants {
+
+    public static final String TAG = "OpenPgp API";
+
+    public static final int API_VERSION = 1;
+    public static final String SERVICE_INTENT = "org.openintents.openpgp.IOpenPgpService";
+
+
+    /* Bundle params */
+    public static final String PARAMS_API_VERSION = "api_version";
+    // request ASCII Armor for output
+    // OpenPGP Radix-64, 33 percent overhead compared to binary, see http://tools.ietf.org/html/rfc4880#page-53)
+    public static final String PARAMS_REQUEST_ASCII_ARMOR = "ascii_armor";
+    // (for encrypt method)
+    public static final String PARAMS_KEY_IDS = "key_ids";
+
+    /* Bundle return */
+    public static final String RESULT_CODE = "result_code";
+    public static final String RESULT_SIGNATURE = "signature";
+    public static final String RESULT_ERRORS = "error";
+    public static final String RESULT_INTENT = "intent";
+
+    // get actual error object from RESULT_ERRORS
+    public static final int RESULT_CODE_ERROR = 0;
+    // success!
+    public static final int RESULT_CODE_SUCCESS = 1;
+    // execute intent and do it again with params from intent
+    public static final int RESULT_CODE_USER_INTERACTION_REQUIRED = 2;
+
+}
diff --git a/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/OpenPgpListPreference.java b/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/util/OpenPgpListPreference.java
index 4ddd97485..ea287a7a9 100644
--- a/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/OpenPgpListPreference.java
+++ b/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/util/OpenPgpListPreference.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013 Dominik Schürmann <dominik@dominikschuermann.de>
+ * Copyright (C) 2014 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.
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package org.openintents.openpgp;
+package org.openintents.openpgp.util;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -70,13 +70,13 @@ public class OpenPgpListPreference extends DialogPreference {
 
     /**
      * Can be used to add "no selection"
-     * 
+     *
      * @param packageName
      * @param simpleName
      * @param icon
      */
     public void addProvider(int position, String packageName, String simpleName, Drawable icon,
-            int apiVersion) {
+                            int apiVersion) {
         mProviderList.add(position, new OpenPgpProviderEntry(packageName, simpleName, icon,
                 apiVersion));
     }
@@ -100,12 +100,12 @@ public class OpenPgpListPreference extends DialogPreference {
                 tv.setCompoundDrawablePadding(dp10);
 
                 // disable if it has the wrong api_version
-                if (mProviderList.get(position).apiVersion == OpenPgpConstants.REQUIRED_API_VERSION) {
+                if (mProviderList.get(position).apiVersion == OpenPgpConstants.API_VERSION) {
                     tv.setEnabled(true);
                 } else {
                     tv.setEnabled(false);
                     tv.setText(tv.getText() + " (API v" + mProviderList.get(position).apiVersion
-                            + ", needs v" + OpenPgpConstants.REQUIRED_API_VERSION + ")");
+                            + ", needs v" + OpenPgpConstants.API_VERSION + ")");
                 }
 
                 return v;
@@ -186,7 +186,7 @@ public class OpenPgpListPreference extends DialogPreference {
         private int apiVersion;
 
         public OpenPgpProviderEntry(String packageName, String simpleName, Drawable icon,
-                int apiVersion) {
+                                    int apiVersion) {
             this.packageName = packageName;
             this.simpleName = simpleName;
             this.icon = icon;
diff --git a/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/OpenPgpServiceConnection.java b/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/util/OpenPgpServiceConnection.java
index f7ba06aaf..780b4606b 100644
--- a/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/OpenPgpServiceConnection.java
+++ b/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/util/OpenPgpServiceConnection.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013 Dominik Schürmann <dominik@dominikschuermann.de>
+ * Copyright (C) 2014 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.
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package org.openintents.openpgp;
+package org.openintents.openpgp.util;
 
 import org.openintents.openpgp.IOpenPgpService;
 
diff --git a/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/OpenPgpHelper.java b/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/util/OpenPgpUtils.java
index 7305c47ce..6dbf76897 100644
--- a/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/OpenPgpHelper.java
+++ b/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/util/OpenPgpUtils.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013 Dominik Schürmann <dominik@dominikschuermann.de>
+ * Copyright (C) 2014 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.
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package org.openintents.openpgp;
+package org.openintents.openpgp.util;
 
 import java.util.List;
 import java.util.regex.Pattern;
@@ -23,7 +23,7 @@ import android.content.Context;
 import android.content.Intent;
 import android.content.pm.ResolveInfo;
 
-public class OpenPgpHelper {
+public class OpenPgpUtils {
     private Context context;
 
     public static Pattern PGP_MESSAGE = Pattern.compile(
@@ -34,7 +34,7 @@ public class OpenPgpHelper {
                     ".*?(-----BEGIN PGP SIGNED MESSAGE-----.*?-----BEGIN PGP SIGNATURE-----.*?-----END PGP SIGNATURE-----).*",
                     Pattern.DOTALL);
 
-    public OpenPgpHelper(Context context) {
+    public OpenPgpUtils(Context context) {
         super();
         this.context = context;
     }
diff --git a/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/util/ParcelFileDescriptorUtil.java b/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/util/ParcelFileDescriptorUtil.java
new file mode 100644
index 000000000..20f8c36f3
--- /dev/null
+++ b/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/util/ParcelFileDescriptorUtil.java
@@ -0,0 +1,104 @@
+/*
+ * Copyright (C) 2014 Dominik Schürmann <dominik@dominikschuermann.de>
+ *               2013 Flow (http://stackoverflow.com/questions/18212152/transfer-inputstream-to-another-service-across-process-boundaries-with-parcelf)
+ *
+ * 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.openintents.openpgp.util;
+
+import android.os.ParcelFileDescriptor;
+import android.util.Log;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+public class ParcelFileDescriptorUtil {
+
+    public interface IThreadListener {
+        void onThreadFinished(final Thread thread);
+    }
+
+    public static ParcelFileDescriptor pipeFrom(InputStream inputStream, IThreadListener listener)
+            throws IOException {
+        ParcelFileDescriptor[] pipe = ParcelFileDescriptor.createPipe();
+        ParcelFileDescriptor readSide = pipe[0];
+        ParcelFileDescriptor writeSide = pipe[1];
+
+        // start the transfer thread
+        new TransferThread(inputStream, new ParcelFileDescriptor.AutoCloseOutputStream(writeSide),
+                listener)
+                .start();
+
+        return readSide;
+    }
+
+    public static ParcelFileDescriptor pipeTo(OutputStream outputStream, IThreadListener listener)
+            throws IOException {
+        ParcelFileDescriptor[] pipe = ParcelFileDescriptor.createPipe();
+        ParcelFileDescriptor readSide = pipe[0];
+        ParcelFileDescriptor writeSide = pipe[1];
+
+        // start the transfer thread
+        new TransferThread(new ParcelFileDescriptor.AutoCloseInputStream(readSide), outputStream,
+                listener)
+                .start();
+
+        return writeSide;
+    }
+
+    static class TransferThread extends Thread {
+        final InputStream mIn;
+        final OutputStream mOut;
+        final IThreadListener mListener;
+
+        TransferThread(InputStream in, OutputStream out, IThreadListener listener) {
+            super("ParcelFileDescriptor Transfer Thread");
+            mIn = in;
+            mOut = out;
+            mListener = listener;
+            setDaemon(true);
+        }
+
+        @Override
+        public void run() {
+            byte[] buf = new byte[1024];
+            int len;
+
+            try {
+                while ((len = mIn.read(buf)) > 0) {
+                    mOut.write(buf, 0, len);
+                }
+                mOut.flush(); // just to be safe
+            } catch (IOException e) {
+                Log.e(OpenPgpConstants.TAG, "TransferThread" + getId() + ": writing failed", e);
+            } finally {
+                try {
+                    mIn.close();
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+                try {
+                    mOut.close();
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+            }
+            if (mListener != null) {
+                Log.d(OpenPgpConstants.TAG, "TransferThread " + getId() + " finished!");
+                mListener.onThreadFinished(this);
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/OpenPGP-Keychain/build.gradle b/OpenPGP-Keychain/build.gradle
index 66c6a0e8f..28e8c37b1 100644
--- a/OpenPGP-Keychain/build.gradle
+++ b/OpenPGP-Keychain/build.gradle
@@ -20,7 +20,7 @@ android {
     buildToolsVersion "19.0.1"
 
     defaultConfig {
-        minSdkVersion 8
+        minSdkVersion 9
         targetSdkVersion 19
     }
 
diff --git a/OpenPGP-Keychain/src/main/AndroidManifest.xml b/OpenPGP-Keychain/src/main/AndroidManifest.xml
index 6de35571f..45b034b97 100644
--- a/OpenPGP-Keychain/src/main/AndroidManifest.xml
+++ b/OpenPGP-Keychain/src/main/AndroidManifest.xml
@@ -30,7 +30,7 @@
     -->
 
     <uses-sdk
-        android:minSdkVersion="8"
+        android:minSdkVersion="9"
         android:targetSdkVersion="19" />
 
     <uses-feature
diff --git a/OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/service/remote/OpenPgpService.java b/OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/service/remote/OpenPgpService.java
index 6db091ed0..9cdb12eda 100644
--- a/OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/service/remote/OpenPgpService.java
+++ b/OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/service/remote/OpenPgpService.java
@@ -19,6 +19,7 @@ package org.sufficientlysecure.keychain.service.remote;
 
 import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
+import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.util.ArrayList;
@@ -30,6 +31,7 @@ import org.openintents.openpgp.IOpenPgpService;
 import org.openintents.openpgp.OpenPgpData;
 import org.openintents.openpgp.OpenPgpError;
 import org.openintents.openpgp.OpenPgpSignatureResult;
+import org.openintents.openpgp.util.OpenPgpConstants;
 import org.spongycastle.util.Arrays;
 import org.sufficientlysecure.keychain.Constants;
 import org.sufficientlysecure.keychain.Id;
@@ -54,7 +56,7 @@ import android.net.Uri;
 import android.os.Bundle;
 import android.os.IBinder;
 import android.os.Message;
-import android.os.RemoteException;
+import android.os.ParcelFileDescriptor;
 
 public class OpenPgpService extends RemoteService {
 
@@ -93,6 +95,7 @@ public class OpenPgpService extends RemoteService {
         return passphrase;
     }
 
+
     public class PassphraseActivityCallback extends UserInputCallback {
 
         private boolean success = false;
@@ -109,11 +112,13 @@ public class OpenPgpService extends RemoteService {
                 success = false;
             }
         }
-    };
+    }
+
+    ;
 
     /**
      * Search database for key ids based on emails.
-     * 
+     *
      * @param encryptionUserIds
      * @return
      */
@@ -213,10 +218,12 @@ public class OpenPgpService extends RemoteService {
                 success = false;
             }
         }
-    };
+    }
+
+    ;
 
     private synchronized void getKeyIdsSafe(String[] userIds, boolean allowUserInteraction,
-            IOpenPgpKeyIdsCallback callback, AppSettings appSettings) {
+                                            IOpenPgpKeyIdsCallback callback, AppSettings appSettings) {
         try {
             long[] keyIds = getKeyIdsFromEmails(userIds, allowUserInteraction);
             if (keyIds == null) {
@@ -225,7 +232,7 @@ public class OpenPgpService extends RemoteService {
 
             callback.onSuccess(keyIds);
         } catch (UserInteractionRequiredException e) {
-            callbackOpenPgpError(callback, OpenPgpError.USER_INTERACTION_REQUIRED, e.getMessage());
+//            callbackOpenPgpError(callback, OpenPgpError.USER_INTERACTION_REQUIRED, e.getMessage());
         } catch (NoUserIdsException e) {
             callbackOpenPgpError(callback, OpenPgpError.NO_USER_IDS, e.getMessage());
         } catch (Exception e) {
@@ -234,8 +241,8 @@ public class OpenPgpService extends RemoteService {
     }
 
     private synchronized void encryptAndSignSafe(OpenPgpData inputData,
-            final OpenPgpData outputData, long[] keyIds, boolean allowUserInteraction,
-            IOpenPgpCallback callback, AppSettings appSettings, boolean sign) {
+                                                 final OpenPgpData outputData, long[] keyIds, boolean allowUserInteraction,
+                                                 IOpenPgpCallback callback, AppSettings appSettings, boolean sign) {
         try {
             // TODO: other options of OpenPgpData!
             byte[] inputBytes = getInput(inputData);
@@ -286,7 +293,7 @@ public class OpenPgpService extends RemoteService {
             // return over handler on client side
             callback.onSuccess(output, null);
         } catch (UserInteractionRequiredException e) {
-            callbackOpenPgpError(callback, OpenPgpError.USER_INTERACTION_REQUIRED, e.getMessage());
+//            callbackOpenPgpError(callback, OpenPgpError.USER_INTERACTION_REQUIRED, e.getMessage());
         } catch (WrongPassphraseException e) {
             callbackOpenPgpError(callback, OpenPgpError.NO_OR_WRONG_PASSPHRASE, e.getMessage());
         } catch (Exception e) {
@@ -295,43 +302,61 @@ public class OpenPgpService extends RemoteService {
     }
 
     // TODO: asciiArmor?!
-    private void signSafe(byte[] inputBytes, boolean allowUserInteraction,
-            IOpenPgpCallback callback, AppSettings appSettings) {
+    private Bundle signImpl(ParcelFileDescriptor input, ParcelFileDescriptor output, AppSettings appSettings) {
         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(), allowUserInteraction);
+            // get passphrase from cache, if key has "no" passphrase, this returns an empty String
+            String passphrase = PassphraseCacheService.getCachedPassphrase(getContext(), appSettings.getKeyId());
             if (passphrase == null) {
-                throw new WrongPassphraseException("No or wrong passphrase!");
-            }
+                // TODO: we need to abort and return a passphrase Intent!
+                Bundle result = new Bundle();
+                result.putInt(OpenPgpConstants.RESULT_CODE, OpenPgpConstants.RESULT_CODE_USER_INTERACTION_REQUIRED);
 
-            PgpOperation operation = new PgpOperation(getContext(), null, inputData, outputStream);
-            operation.signText(appSettings.getKeyId(), passphrase, appSettings.getHashAlgorithm(),
-                    Preferences.getPreferences(this).getForceV3Signatures());
-
-            outputStream.close();
+                return result;
+            }
 
-            byte[] outputBytes = ((ByteArrayOutputStream) outputStream).toByteArray();
-            OpenPgpData output = new OpenPgpData(new String(outputBytes));
+            // INPUT
+            InputStream is = new ParcelFileDescriptor.AutoCloseInputStream(input);
+            // OUTPUT
+            OutputStream os = new ParcelFileDescriptor.AutoCloseOutputStream(output);
+            try {
+                long inputLength = is.available();
+                InputData inputData = new InputData(is, inputLength);
+
+                PgpOperation operation = new PgpOperation(getContext(), null, inputData, os);
+                operation.signText(appSettings.getKeyId(), passphrase, appSettings.getHashAlgorithm(),
+                        Preferences.getPreferences(this).getForceV3Signatures());
+
+                is.close();
+                os.close();
+            } catch (IOException e) {
+                Log.e(Constants.TAG, "Fail", e);
+            } finally {
+                try {
+                    is.close();
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+                try {
+                    os.close();
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+            }
 
-            // return over handler on client side
-            callback.onSuccess(output, null);
-        } catch (UserInteractionRequiredException e) {
-            callbackOpenPgpError(callback, OpenPgpError.USER_INTERACTION_REQUIRED, e.getMessage());
-        } catch (WrongPassphraseException e) {
-            callbackOpenPgpError(callback, OpenPgpError.NO_OR_WRONG_PASSPHRASE, e.getMessage());
+            Bundle result = new Bundle();
+            result.putInt(OpenPgpConstants.RESULT_CODE, OpenPgpConstants.RESULT_CODE_SUCCESS);
+            return result;
         } catch (Exception e) {
-            callbackOpenPgpError(callback, OpenPgpError.GENERIC_ERROR, e.getMessage());
+            Bundle result = new Bundle();
+            result.putInt(OpenPgpConstants.RESULT_CODE, OpenPgpConstants.RESULT_CODE_ERROR);
+            result.putParcelable(OpenPgpConstants.RESULT_ERRORS,
+                    new OpenPgpError(OpenPgpError.GENERIC_ERROR, e.getMessage()));
+            return result;
         }
     }
 
     private synchronized void decryptAndVerifySafe(byte[] inputBytes, boolean allowUserInteraction,
-            IOpenPgpCallback callback, AppSettings appSettings) {
+                                                   IOpenPgpCallback callback, AppSettings appSettings) {
         try {
             // TODO: this is not really needed
             // checked if it is text with BEGIN and END tags
@@ -458,7 +483,7 @@ public class OpenPgpService extends RemoteService {
             // return over handler on client side
             callback.onSuccess(output, sigResult);
         } catch (UserInteractionRequiredException e) {
-            callbackOpenPgpError(callback, OpenPgpError.USER_INTERACTION_REQUIRED, e.getMessage());
+//            callbackOpenPgpError(callback, OpenPgpError.USER_INTERACTION_REQUIRED, e.getMessage());
         } catch (WrongPassphraseException e) {
             callbackOpenPgpError(callback, OpenPgpError.NO_OR_WRONG_PASSPHRASE, e.getMessage());
         } catch (Exception e) {
@@ -468,7 +493,7 @@ public class OpenPgpService extends RemoteService {
 
     /**
      * Returns error to IOpenPgpCallback
-     * 
+     *
      * @param callback
      * @param errorId
      * @param message
@@ -494,82 +519,125 @@ public class OpenPgpService extends RemoteService {
     private final IOpenPgpService.Stub mBinder = new IOpenPgpService.Stub() {
 
         @Override
-        public void encrypt(final OpenPgpData input, final OpenPgpData output, final long[] keyIds,
-                final IOpenPgpCallback callback) throws RemoteException {
-            final AppSettings settings = getAppSettings();
-
-            Runnable r = new Runnable() {
-                @Override
-                public void run() {
-                    encryptAndSignSafe(input, output, keyIds, true, callback, settings, false);
-                }
-            };
+        public Bundle sign(Bundle params, final ParcelFileDescriptor input, final ParcelFileDescriptor output) {
+            final AppSettings appSettings = getAppSettings();
+
+            Bundle result = new Bundle();
+            if (params.getInt(OpenPgpConstants.PARAMS_API_VERSION) != OpenPgpConstants.API_VERSION) {
+                // not compatible!
+                OpenPgpError error = new OpenPgpError(OpenPgpError.INCOMPATIBLE_API_VERSIONS, "Incompatible API versions!");
+                result.putParcelable(OpenPgpConstants.RESULT_ERRORS, error);
+                result.putInt(OpenPgpConstants.RESULT_CODE, OpenPgpConstants.RESULT_CODE_ERROR);
+                return result;
+            }
 
-            checkAndEnqueue(r);
-        }
+//            Runnable r = new Runnable() {
+//                @Override
+//                public void run() {
+            return signImpl(input, output, appSettings);
+//                }
+//            };
 
-        @Override
-        public void signAndEncrypt(final OpenPgpData input, final OpenPgpData output,
-                final long[] keyIds, final IOpenPgpCallback callback) throws RemoteException {
-            final AppSettings settings = getAppSettings();
-
-            Runnable r = new Runnable() {
-                @Override
-                public void run() {
-                    encryptAndSignSafe(input, output, keyIds, true, callback, settings, true);
-                }
-            };
+//            checkAndEnqueue(r);
 
-            checkAndEnqueue(r);
+//            return null;
         }
 
         @Override
-        public void sign(final OpenPgpData input, final OpenPgpData output,
-                final IOpenPgpCallback callback) throws RemoteException {
-            final AppSettings settings = getAppSettings();
-
-            Runnable r = new Runnable() {
-                @Override
-                public void run() {
-                    signSafe(getInput(input), true, callback, settings);
-                }
-            };
+        public Bundle encrypt(Bundle params, ParcelFileDescriptor input, ParcelFileDescriptor output) {
 
-            checkAndEnqueue(r);
+            return null;
         }
 
         @Override
-        public void decryptAndVerify(final OpenPgpData input, final OpenPgpData output,
-                final IOpenPgpCallback callback) throws RemoteException {
-
-            final AppSettings settings = getAppSettings();
-
-            Runnable r = new Runnable() {
-                @Override
-                public void run() {
-                    decryptAndVerifySafe(getInput(input), true, callback, settings);
-                }
-            };
+        public Bundle signAndEncrypt(Bundle params, ParcelFileDescriptor input, ParcelFileDescriptor output) {
 
-            checkAndEnqueue(r);
+            return null;
         }
 
         @Override
-        public void getKeyIds(final String[] userIds, final boolean allowUserInteraction,
-                final IOpenPgpKeyIdsCallback callback) throws RemoteException {
-
-            final AppSettings settings = getAppSettings();
-
-            Runnable r = new Runnable() {
-                @Override
-                public void run() {
-                    getKeyIdsSafe(userIds, allowUserInteraction, callback, settings);
-                }
-            };
+        public Bundle decryptAndVerify(Bundle params, ParcelFileDescriptor input, ParcelFileDescriptor output) {
 
-            checkAndEnqueue(r);
+            return null;
         }
 
+//        @Override
+//        public void encrypt(final OpenPgpData input, final OpenPgpData output, final long[] keyIds,
+//                final IOpenPgpCallback callback) throws RemoteException {
+//            final AppSettings settings = getAppSettings();
+//
+//            Runnable r = new Runnable() {
+//                @Override
+//                public void run() {
+//                    encryptAndSignSafe(input, output, keyIds, true, callback, settings, false);
+//                }
+//            };
+//
+//            checkAndEnqueue(r);
+//        }
+//
+//        @Override
+//        public void signAndEncrypt(final OpenPgpData input, final OpenPgpData output,
+//                final long[] keyIds, final IOpenPgpCallback callback) throws RemoteException {
+//            final AppSettings settings = getAppSettings();
+//
+//            Runnable r = new Runnable() {
+//                @Override
+//                public void run() {
+//                    encryptAndSignSafe(input, output, keyIds, true, callback, settings, true);
+//                }
+//            };
+//
+//            checkAndEnqueue(r);
+//        }
+//
+//        @Override
+//        public void sign(final OpenPgpData input, final OpenPgpData output,
+//                final IOpenPgpCallback callback) throws RemoteException {
+//            final AppSettings settings = getAppSettings();
+//
+//            Runnable r = new Runnable() {
+//                @Override
+//                public void run() {
+//                    signImpl(getInput(input), true, callback, settings);
+//                }
+//            };
+//
+//            checkAndEnqueue(r);
+//        }
+//
+//        @Override
+//        public void decryptAndVerify(final OpenPgpData input, final OpenPgpData output,
+//                final IOpenPgpCallback callback) throws RemoteException {
+//
+//            final AppSettings settings = getAppSettings();
+//
+//            Runnable r = new Runnable() {
+//                @Override
+//                public void run() {
+//                    decryptAndVerifySafe(getInput(input), true, callback, settings);
+//                }
+//            };
+//
+//            checkAndEnqueue(r);
+//        }
+//
+//        @Override
+//        public void getKeyIds(final String[] userIds, final boolean allowUserInteraction,
+//                final IOpenPgpKeyIdsCallback callback) throws RemoteException {
+//
+//            final AppSettings settings = getAppSettings();
+//
+//            Runnable r = new Runnable() {
+//                @Override
+//                public void run() {
+//                    getKeyIdsSafe(userIds, allowUserInteraction, callback, settings);
+//                }
+//            };
+//
+//            checkAndEnqueue(r);
+//        }
+
     };
 
     private static byte[] getInput(OpenPgpData data) {
@@ -577,17 +645,17 @@ public class OpenPgpService extends RemoteService {
 
         byte[] inBytes = null;
         switch (data.getType()) {
-        case OpenPgpData.TYPE_STRING:
-            inBytes = data.getString().getBytes();
-            break;
+            case OpenPgpData.TYPE_STRING:
+                inBytes = data.getString().getBytes();
+                break;
 
-        case OpenPgpData.TYPE_BYTE_ARRAY:
-            inBytes = data.getBytes();
-            break;
+            case OpenPgpData.TYPE_BYTE_ARRAY:
+                inBytes = data.getBytes();
+                break;
 
-        default:
-            Log.e(Constants.TAG, "Uri and ParcelFileDescriptor not supported right now!");
-            break;
+            default:
+                Log.e(Constants.TAG, "Uri and ParcelFileDescriptor not supported right now!");
+                break;
         }
 
         return inBytes;
diff --git a/OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/service/remote/RemoteService.java b/OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/service/remote/RemoteService.java
index bc513d532..ddc704c01 100644
--- a/OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/service/remote/RemoteService.java
+++ b/OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/service/remote/RemoteService.java
@@ -162,10 +162,6 @@ public abstract class RemoteService extends Service {
 
     /**
      * Locks current thread and pauses execution of runnables and starts activity for user input
-     * 
-     * @param action
-     * @param messenger
-     * @param extras
      */
     protected void pauseAndStartUserInteraction(String action, BaseCallback callback, Bundle extras) {
         synchronized (userInputLock) {
diff --git a/libraries/keychain-api-library/build.gradle b/libraries/keychain-api-library/build.gradle
index 5436ecd0a..f9da72cb8 100644
--- a/libraries/keychain-api-library/build.gradle
+++ b/libraries/keychain-api-library/build.gradle
@@ -1,5 +1,15 @@
-apply plugin: 'android-library'
+// please leave this here, so this library builds on its own
+buildscript {
+    repositories {
+        mavenCentral()
+    }
+
+    dependencies {
+        classpath 'com.android.tools.build:gradle:0.8.0'
+    }
+}
 
+apply plugin: 'android-library'
 
 android {
     compileSdkVersion 19
diff --git a/libraries/keychain-api-library/src/main/AndroidManifest.xml b/libraries/keychain-api-library/src/main/AndroidManifest.xml
index 32b4a82e5..768922c22 100644
--- a/libraries/keychain-api-library/src/main/AndroidManifest.xml
+++ b/libraries/keychain-api-library/src/main/AndroidManifest.xml
@@ -5,7 +5,7 @@
     android:versionName="1.0" >
 
     <uses-sdk
-        android:minSdkVersion="8"
+        android:minSdkVersion="9"
         android:targetSdkVersion="19" />
 
     <application/>
diff --git a/libraries/keychain-api-library/src/main/aidl/org/openintents/openpgp/IOpenPgpKeyIdsCallback.aidl b/libraries/keychain-api-library/src/main/aidl/org/openintents/openpgp/IOpenPgpKeyIdsCallback.aidl
index 4ca356fad..f9b5fc453 100644
--- a/libraries/keychain-api-library/src/main/aidl/org/openintents/openpgp/IOpenPgpKeyIdsCallback.aidl
+++ b/libraries/keychain-api-library/src/main/aidl/org/openintents/openpgp/IOpenPgpKeyIdsCallback.aidl
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013 Dominik Schürmann <dominik@dominikschuermann.de>
+ * Copyright (C) 2014 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.
diff --git a/libraries/keychain-api-library/src/main/aidl/org/openintents/openpgp/IOpenPgpService.aidl b/libraries/keychain-api-library/src/main/aidl/org/openintents/openpgp/IOpenPgpService.aidl
index 8f9e8a0fd..ef390a7f6 100644
--- a/libraries/keychain-api-library/src/main/aidl/org/openintents/openpgp/IOpenPgpService.aidl
+++ b/libraries/keychain-api-library/src/main/aidl/org/openintents/openpgp/IOpenPgpService.aidl
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013 Dominik Schürmann <dominik@dominikschuermann.de>
+ * Copyright (C) 2014 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.
@@ -20,13 +20,36 @@ import org.openintents.openpgp.OpenPgpData;
 import org.openintents.openpgp.IOpenPgpCallback;
 import org.openintents.openpgp.IOpenPgpKeyIdsCallback;
 
-/**
- * All methods are oneway, which means they are asynchronous and non-blocking.
- * Results are returned to the callback, which has to be implemented on client side.
- */
 interface IOpenPgpService {
 
     /**
+     * Bundle params:
+     * api_version 1,2,3,... (current: 1)
+     * ascii_armor true/false (for output)
+     * key_ids long[] (for encrypt method)
+     *
+     *
+     * Bundle return:
+     * result_code RESULT_ERROR=0 (see error), RESULT_OK=1, RESULT_USER_INTERACTION_REQUIRED=2 (execute intent and do it again with params from intent)
+     * signature_result OpenPgpSignatureResult
+     * error OpenPgpError
+     * intent Intent
+     *
+     */
+
+    Bundle sign(in Bundle params, in ParcelFileDescriptor input, in ParcelFileDescriptor output);
+
+    Bundle encrypt(in Bundle params, in ParcelFileDescriptor input, in ParcelFileDescriptor output);
+
+    Bundle signAndEncrypt(in Bundle params, in ParcelFileDescriptor input, in ParcelFileDescriptor output);
+
+    Bundle decryptAndVerify(in Bundle params, in ParcelFileDescriptor input, in ParcelFileDescriptor output);
+
+
+/*
+    ------------------OLD--------------------------
+*/
+    /**
      * Sign
      * 
      * After successful signing, callback's onSuccess will contain the resulting output.
@@ -48,8 +71,9 @@ interface IOpenPgpService {
      * @param callback
      *            Callback where to return results
      */
-    oneway void sign(in OpenPgpData input, in OpenPgpData output, in IOpenPgpCallback callback);
-    
+    //oneway void sign(in OpenPgpData input, in OpenPgpData output, in IOpenPgpCallback callback);
+
+
     /**
      * Encrypt
      * 
@@ -74,7 +98,7 @@ interface IOpenPgpService {
      * @param callback
      *            Callback where to return results
      */
-    oneway void encrypt(in OpenPgpData input, in OpenPgpData output, in long[] keyIds, in IOpenPgpCallback callback);
+    //oneway void encrypt(in OpenPgpData input, in OpenPgpData output, in long[] keyIds, in IOpenPgpCallback callback);
     
     /**
      * Sign then encrypt
@@ -100,7 +124,7 @@ interface IOpenPgpService {
      * @param callback
      *            Callback where to return results
      */
-    oneway void signAndEncrypt(in OpenPgpData input, in OpenPgpData output, in long[] keyIds, in IOpenPgpCallback callback);
+    //oneway void signAndEncrypt(in OpenPgpData input, in OpenPgpData output, in long[] keyIds, in IOpenPgpCallback callback);
     
     /**
      * Decrypts and verifies given input bytes. This methods handles encrypted-only, signed-and-encrypted,
@@ -126,7 +150,7 @@ interface IOpenPgpService {
      * @param callback
      *            Callback where to return results
      */
-    oneway void decryptAndVerify(in OpenPgpData input, in OpenPgpData output, in IOpenPgpCallback callback);
+    //oneway void decryptAndVerify(in OpenPgpData input, in OpenPgpData output, in IOpenPgpCallback callback);
     
     /**
      * Get available key ids based on given user ids
@@ -138,6 +162,6 @@ interface IOpenPgpService {
      * @param callback
      *            Callback where to return results (different type than callback in other functions!)
      */
-    oneway void getKeyIds(in String[] ids, in boolean allowUserInteraction, in IOpenPgpKeyIdsCallback callback);
+    //oneway void getKeyIds(in String[] ids, in boolean allowUserInteraction, in IOpenPgpKeyIdsCallback callback);
     
 }
\ No newline at end of file
diff --git a/libraries/keychain-api-library/src/main/aidl/org/openintents/openpgp/OpenPgpError.aidl b/libraries/keychain-api-library/src/main/aidl/org/openintents/openpgp/OpenPgpError.aidl
index 7a6bed1e6..7f867653d 100644
--- a/libraries/keychain-api-library/src/main/aidl/org/openintents/openpgp/OpenPgpError.aidl
+++ b/libraries/keychain-api-library/src/main/aidl/org/openintents/openpgp/OpenPgpError.aidl
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013 Dominik Schürmann <dominik@dominikschuermann.de>
+ * Copyright (C) 2014 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.
diff --git a/libraries/keychain-api-library/src/main/aidl/org/openintents/openpgp/OpenPgpSignatureResult.aidl b/libraries/keychain-api-library/src/main/aidl/org/openintents/openpgp/OpenPgpSignatureResult.aidl
index e246792d0..d1d138b30 100644
--- a/libraries/keychain-api-library/src/main/aidl/org/openintents/openpgp/OpenPgpSignatureResult.aidl
+++ b/libraries/keychain-api-library/src/main/aidl/org/openintents/openpgp/OpenPgpSignatureResult.aidl
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013 Dominik Schürmann <dominik@dominikschuermann.de>
+ * Copyright (C) 2014 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.
diff --git a/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/OpenPgpConstants.java b/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/OpenPgpConstants.java
deleted file mode 100644
index b1ca1bfe6..000000000
--- a/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/OpenPgpConstants.java
+++ /dev/null
@@ -1,10 +0,0 @@
-package org.openintents.openpgp;
-
-public class OpenPgpConstants {
-
-    public static final String TAG = "OpenPgp API";
-
-    public static final int REQUIRED_API_VERSION = 1;
-    public static final String SERVICE_INTENT = "org.openintents.openpgp.IOpenPgpService";
-
-}
diff --git a/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/OpenPgpError.java b/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/OpenPgpError.java
index f108d3169..4dd2cc641 100644
--- a/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/OpenPgpError.java
+++ b/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/OpenPgpError.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013 Dominik Schürmann <dominik@dominikschuermann.de>
+ * Copyright (C) 2014 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.
@@ -20,10 +20,13 @@ import android.os.Parcel;
 import android.os.Parcelable;
 
 public class OpenPgpError implements Parcelable {
+    public static final int CLIENT_SIDE_ERROR = -1;
+
     public static final int GENERIC_ERROR = 0;
-    public static final int NO_OR_WRONG_PASSPHRASE = 1;
-    public static final int NO_USER_IDS = 2;
-    public static final int USER_INTERACTION_REQUIRED = 3;
+    public static final int INCOMPATIBLE_API_VERSIONS = 1;
+
+    public static final int NO_OR_WRONG_PASSPHRASE = 2;
+    public static final int NO_USER_IDS = 3;
 
     int errorId;
     String message;
diff --git a/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/OpenPgpSignatureResult.java b/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/OpenPgpSignatureResult.java
index 829f8f8cf..226eeacc2 100644
--- a/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/OpenPgpSignatureResult.java
+++ b/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/OpenPgpSignatureResult.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013 Dominik Schürmann <dominik@dominikschuermann.de>
+ * Copyright (C) 2014 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.
diff --git a/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/util/OpenPgpApi.java b/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/util/OpenPgpApi.java
new file mode 100644
index 000000000..6efb507c4
--- /dev/null
+++ b/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/util/OpenPgpApi.java
@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2014 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.openintents.openpgp.util;
+
+import android.os.Bundle;
+import android.os.ParcelFileDescriptor;
+import android.os.RemoteException;
+import android.util.Log;
+
+import org.openintents.openpgp.IOpenPgpService;
+import org.openintents.openpgp.OpenPgpError;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+public class OpenPgpApi {
+
+    IOpenPgpService mService;
+
+    public OpenPgpApi(IOpenPgpService service) {
+        this.mService = service;
+    }
+
+    public Bundle sign(InputStream is, final OutputStream os) {
+        try {
+            // send the input and output pfds
+            ParcelFileDescriptor input = ParcelFileDescriptorUtil.pipeFrom(is,
+                    new ParcelFileDescriptorUtil.IThreadListener() {
+
+                        @Override
+                        public void onThreadFinished(Thread thread) {
+                            Log.d(OpenPgpConstants.TAG, "Copy to service finished");
+                        }
+                    });
+            ParcelFileDescriptor output = ParcelFileDescriptorUtil.pipeTo(os,
+                    new ParcelFileDescriptorUtil.IThreadListener() {
+
+                        @Override
+                        public void onThreadFinished(Thread thread) {
+                            Log.d(OpenPgpConstants.TAG, "Service finished writing!");
+                        }
+                    });
+
+            // blocks until result is ready
+            Bundle result = mService.sign(null, input, output);
+            // close() is required to halt the TransferThread
+            output.close();
+
+            return result;
+        } catch (RemoteException e) {
+            Log.e(OpenPgpConstants.TAG, "RemoteException", e);
+            Bundle result = new Bundle();
+            result.putInt(OpenPgpConstants.RESULT_CODE, OpenPgpConstants.RESULT_CODE_ERROR);
+            result.putParcelable(OpenPgpConstants.RESULT_ERRORS,
+                    new OpenPgpError(OpenPgpError.CLIENT_SIDE_ERROR, e.getMessage()));
+            return result;
+        } catch (IOException e) {
+            Log.e(OpenPgpConstants.TAG, "IOException", e);
+            Bundle result = new Bundle();
+            result.putInt(OpenPgpConstants.RESULT_CODE, OpenPgpConstants.RESULT_CODE_ERROR);
+            result.putParcelable(OpenPgpConstants.RESULT_ERRORS,
+                    new OpenPgpError(OpenPgpError.CLIENT_SIDE_ERROR, e.getMessage()));
+            return result;
+        }
+    }
+
+
+}
diff --git a/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/util/OpenPgpConstants.java b/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/util/OpenPgpConstants.java
new file mode 100644
index 000000000..3dd9391d0
--- /dev/null
+++ b/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/util/OpenPgpConstants.java
@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2014 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.openintents.openpgp.util;
+
+public class OpenPgpConstants {
+
+    public static final String TAG = "OpenPgp API";
+
+    public static final int API_VERSION = 1;
+    public static final String SERVICE_INTENT = "org.openintents.openpgp.IOpenPgpService";
+
+
+    /* Bundle params */
+    public static final String PARAMS_API_VERSION = "api_version";
+    // request ASCII Armor for output
+    // OpenPGP Radix-64, 33 percent overhead compared to binary, see http://tools.ietf.org/html/rfc4880#page-53)
+    public static final String PARAMS_REQUEST_ASCII_ARMOR = "ascii_armor";
+    // (for encrypt method)
+    public static final String PARAMS_KEY_IDS = "key_ids";
+
+    /* Bundle return */
+    public static final String RESULT_CODE = "result_code";
+    public static final String RESULT_SIGNATURE = "signature";
+    public static final String RESULT_ERRORS = "error";
+    public static final String RESULT_INTENT = "intent";
+
+    // get actual error object from RESULT_ERRORS
+    public static final int RESULT_CODE_ERROR = 0;
+    // success!
+    public static final int RESULT_CODE_SUCCESS = 1;
+    // execute intent and do it again with params from intent
+    public static final int RESULT_CODE_USER_INTERACTION_REQUIRED = 2;
+
+}
diff --git a/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/OpenPgpListPreference.java b/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/util/OpenPgpListPreference.java
index 4ddd97485..ea287a7a9 100644
--- a/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/OpenPgpListPreference.java
+++ b/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/util/OpenPgpListPreference.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013 Dominik Schürmann <dominik@dominikschuermann.de>
+ * Copyright (C) 2014 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.
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package org.openintents.openpgp;
+package org.openintents.openpgp.util;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -70,13 +70,13 @@ public class OpenPgpListPreference extends DialogPreference {
 
     /**
      * Can be used to add "no selection"
-     * 
+     *
      * @param packageName
      * @param simpleName
      * @param icon
      */
     public void addProvider(int position, String packageName, String simpleName, Drawable icon,
-            int apiVersion) {
+                            int apiVersion) {
         mProviderList.add(position, new OpenPgpProviderEntry(packageName, simpleName, icon,
                 apiVersion));
     }
@@ -100,12 +100,12 @@ public class OpenPgpListPreference extends DialogPreference {
                 tv.setCompoundDrawablePadding(dp10);
 
                 // disable if it has the wrong api_version
-                if (mProviderList.get(position).apiVersion == OpenPgpConstants.REQUIRED_API_VERSION) {
+                if (mProviderList.get(position).apiVersion == OpenPgpConstants.API_VERSION) {
                     tv.setEnabled(true);
                 } else {
                     tv.setEnabled(false);
                     tv.setText(tv.getText() + " (API v" + mProviderList.get(position).apiVersion
-                            + ", needs v" + OpenPgpConstants.REQUIRED_API_VERSION + ")");
+                            + ", needs v" + OpenPgpConstants.API_VERSION + ")");
                 }
 
                 return v;
@@ -186,7 +186,7 @@ public class OpenPgpListPreference extends DialogPreference {
         private int apiVersion;
 
         public OpenPgpProviderEntry(String packageName, String simpleName, Drawable icon,
-                int apiVersion) {
+                                    int apiVersion) {
             this.packageName = packageName;
             this.simpleName = simpleName;
             this.icon = icon;
diff --git a/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/OpenPgpServiceConnection.java b/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/util/OpenPgpServiceConnection.java
index f7ba06aaf..780b4606b 100644
--- a/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/OpenPgpServiceConnection.java
+++ b/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/util/OpenPgpServiceConnection.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013 Dominik Schürmann <dominik@dominikschuermann.de>
+ * Copyright (C) 2014 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.
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package org.openintents.openpgp;
+package org.openintents.openpgp.util;
 
 import org.openintents.openpgp.IOpenPgpService;
 
diff --git a/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/OpenPgpHelper.java b/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/util/OpenPgpUtils.java
index 7305c47ce..6dbf76897 100644
--- a/OpenPGP-Keychain-API/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/OpenPgpHelper.java
+++ b/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/util/OpenPgpUtils.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013 Dominik Schürmann <dominik@dominikschuermann.de>
+ * Copyright (C) 2014 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.
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package org.openintents.openpgp;
+package org.openintents.openpgp.util;
 
 import java.util.List;
 import java.util.regex.Pattern;
@@ -23,7 +23,7 @@ import android.content.Context;
 import android.content.Intent;
 import android.content.pm.ResolveInfo;
 
-public class OpenPgpHelper {
+public class OpenPgpUtils {
     private Context context;
 
     public static Pattern PGP_MESSAGE = Pattern.compile(
@@ -34,7 +34,7 @@ public class OpenPgpHelper {
                     ".*?(-----BEGIN PGP SIGNED MESSAGE-----.*?-----BEGIN PGP SIGNATURE-----.*?-----END PGP SIGNATURE-----).*",
                     Pattern.DOTALL);
 
-    public OpenPgpHelper(Context context) {
+    public OpenPgpUtils(Context context) {
         super();
         this.context = context;
     }
diff --git a/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/util/ParcelFileDescriptorUtil.java b/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/util/ParcelFileDescriptorUtil.java
new file mode 100644
index 000000000..20f8c36f3
--- /dev/null
+++ b/libraries/keychain-api-library/src/main/java/org/openintents/openpgp/util/ParcelFileDescriptorUtil.java
@@ -0,0 +1,104 @@
+/*
+ * Copyright (C) 2014 Dominik Schürmann <dominik@dominikschuermann.de>
+ *               2013 Flow (http://stackoverflow.com/questions/18212152/transfer-inputstream-to-another-service-across-process-boundaries-with-parcelf)
+ *
+ * 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.openintents.openpgp.util;
+
+import android.os.ParcelFileDescriptor;
+import android.util.Log;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+public class ParcelFileDescriptorUtil {
+
+    public interface IThreadListener {
+        void onThreadFinished(final Thread thread);
+    }
+
+    public static ParcelFileDescriptor pipeFrom(InputStream inputStream, IThreadListener listener)
+            throws IOException {
+        ParcelFileDescriptor[] pipe = ParcelFileDescriptor.createPipe();
+        ParcelFileDescriptor readSide = pipe[0];
+        ParcelFileDescriptor writeSide = pipe[1];
+
+        // start the transfer thread
+        new TransferThread(inputStream, new ParcelFileDescriptor.AutoCloseOutputStream(writeSide),
+                listener)
+                .start();
+
+        return readSide;
+    }
+
+    public static ParcelFileDescriptor pipeTo(OutputStream outputStream, IThreadListener listener)
+            throws IOException {
+        ParcelFileDescriptor[] pipe = ParcelFileDescriptor.createPipe();
+        ParcelFileDescriptor readSide = pipe[0];
+        ParcelFileDescriptor writeSide = pipe[1];
+
+        // start the transfer thread
+        new TransferThread(new ParcelFileDescriptor.AutoCloseInputStream(readSide), outputStream,
+                listener)
+                .start();
+
+        return writeSide;
+    }
+
+    static class TransferThread extends Thread {
+        final InputStream mIn;
+        final OutputStream mOut;
+        final IThreadListener mListener;
+
+        TransferThread(InputStream in, OutputStream out, IThreadListener listener) {
+            super("ParcelFileDescriptor Transfer Thread");
+            mIn = in;
+            mOut = out;
+            mListener = listener;
+            setDaemon(true);
+        }
+
+        @Override
+        public void run() {
+            byte[] buf = new byte[1024];
+            int len;
+
+            try {
+                while ((len = mIn.read(buf)) > 0) {
+                    mOut.write(buf, 0, len);
+                }
+                mOut.flush(); // just to be safe
+            } catch (IOException e) {
+                Log.e(OpenPgpConstants.TAG, "TransferThread" + getId() + ": writing failed", e);
+            } finally {
+                try {
+                    mIn.close();
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+                try {
+                    mOut.close();
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+            }
+            if (mListener != null) {
+                Log.d(OpenPgpConstants.TAG, "TransferThread " + getId() + " finished!");
+                mListener.onThreadFinished(this);
+            }
+        }
+    }
+}
\ No newline at end of file