Merge pull request #457 from openpgp-keychain/openpgp

OpenPGP Provider API

build.gradle

@@ -15,6 +15,7 @@ dependencies {
   compile project(':plugins:Android-PullToRefresh:library')
   compile project(':plugins:ckChangeLog:library')
   compile project(':plugins:HoloColorPicker')
+  compile project(':plugins:openpgp-api-library')
   compile fileTree(dir: 'libs', include: '*.jar')
 }
 
@@ -37,6 +38,12 @@ android {
     }
   }
   
+
+  // Do not abort build if lint finds errors
+  lintOptions {
+    abortOnError false
+  }
+
   packagingOptions {
     exclude 'META-INF/DEPENDENCIES'
     exclude 'META-INF/LICENSE'

plugins/ActionBarSherlock/library/build.gradle

@@ -15,6 +15,11 @@ android {
       res.srcDirs = ['res']
     }
   }
+  
+  // Do not abort build if lint finds errors
+  lintOptions {
+    abortOnError false
+  }
 }
 
 archivesBaseName = 'ActionBarSherlock'

plugins/Android-PullToRefresh/library/build.gradle

@@ -11,6 +11,11 @@ android {
       res.srcDirs = ['res']
     }
   }
+  
+  // Do not abort build if lint finds errors
+  lintOptions {
+    abortOnError false
+  }
 }
 
 archivesBaseName = 'PullToRefresh'

plugins/HoloColorPicker/build.gradle

@@ -11,4 +11,9 @@ android {
       res.srcDirs = ['res']
     }
   }
+  
+  // Do not abort build if lint finds errors
+  lintOptions {
+    abortOnError false
+  }
 }

plugins/ckChangeLog/library/build.gradle

@@ -11,6 +11,11 @@ android {
       res.srcDirs = ['res']
     }
   }
+  
+  // Do not abort build if lint finds errors
+  lintOptions {
+    abortOnError false
+  }
 }
 
 archivesBaseName = 'ckChangeLog'

plugins/openpgp-api-library/.gitignore

@@ -0,0 +1,29 @@
+#Android specific
+bin
+gen
+obj
+lint.xml
+local.properties
+release.properties
+ant.properties
+*.class
+*.apk
+
+#Gradle
+.gradle
+build
+gradle.properties
+
+#Maven
+target
+pom.xml.*
+
+#Eclipse
+.project
+.classpath
+.settings
+.metadata
+
+#IntelliJ IDEA
+.idea
+*.iml

plugins/openpgp-api-library/AndroidManifest.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="org.openintents.openpgp"
+    android:versionCode="1"
+    android:versionName="1.0" >
+
+    <uses-sdk
+        android:minSdkVersion="9"
+        android:targetSdkVersion="17" />
+
+    <application/>
+
+</manifest>

plugins/openpgp-api-library/LICENSE

@@ -0,0 +1,202 @@
+
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+
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plugins/openpgp-api-library/build.gradle

@@ -0,0 +1,35 @@
+// please leave this here, so this library builds on its own
+buildscript {
+    repositories {
+        mavenCentral()
+    }
+
+    dependencies {
+        classpath 'com.android.tools.build:gradle:0.8.3'
+    }
+}
+
+apply plugin: 'android-library'
+
+android {
+    compileSdkVersion 17
+    buildToolsVersion '19.0.1'
+    
+    // NOTE: We are using the old folder structure to also support Eclipse
+    sourceSets {
+        main {
+            manifest.srcFile 'AndroidManifest.xml'
+            java.srcDirs = ['src']
+            resources.srcDirs = ['src']
+            aidl.srcDirs = ['src']
+            renderscript.srcDirs = ['src']
+            res.srcDirs = ['res']
+            assets.srcDirs = ['assets']
+        }
+    }
+    
+    // Do not abort build if lint finds errors
+    lintOptions {
+        abortOnError false
+    }
+}

plugins/openpgp-api-library/project.properties

@@ -0,0 +1,15 @@
+# This file is automatically generated by Android Tools.
+# Do not modify this file -- YOUR CHANGES WILL BE ERASED!
+#
+# This file must be checked in Version Control Systems.
+#
+# To customize properties used by the Ant build system edit
+# "ant.properties", and override values to adapt the script to your
+# project structure.
+#
+# To enable ProGuard to shrink and obfuscate your code, uncomment this (available properties: sdk.dir, user.home):
+#proguard.config=${sdk.dir}/tools/proguard/proguard-android.txt:proguard-project.txt
+
+# Project target.
+target=android-19
+android.library=true

plugins/openpgp-api-library/res/values/strings.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+
+    <string name="openpgp_list_preference_none">None</string>
+    <string name="openpgp_install_openkeychain_via">Install OpenKeychain via %s</string>
+
+</resources>

plugins/openpgp-api-library/src/org/openintents/openpgp/IOpenPgpService.aidl

@@ -0,0 +1,24 @@
+/*
+ * 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;
+
+interface IOpenPgpService {
+
+    // see OpenPgpApi for documentation
+    Intent execute(in Intent data, in ParcelFileDescriptor input, in ParcelFileDescriptor output);
+
+}

plugins/openpgp-api-library/src/org/openintents/openpgp/OpenPgpError.java

@@ -0,0 +1,118 @@
+/*
+ * 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;
+
+import android.os.Parcel;
+import android.os.Parcelable;
+
+/**
+ * Parcelable versioning has been copied from Dashclock Widget
+ * https://code.google.com/p/dashclock/source/browse/api/src/main/java/com/google/android/apps/dashclock/api/ExtensionData.java
+ */
+public class OpenPgpError implements Parcelable {
+    /**
+     * Since there might be a case where new versions of the client using the library getting
+     * old versions of the protocol (and thus old versions of this class), we need a versioning
+     * system for the parcels sent between the clients and the providers.
+     */
+    public static final int PARCELABLE_VERSION = 1;
+
+    // possible values for errorId
+    public static final int CLIENT_SIDE_ERROR = -1;
+    public static final int GENERIC_ERROR = 0;
+    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;
+
+    public OpenPgpError() {
+    }
+
+    public OpenPgpError(int errorId, String message) {
+        this.errorId = errorId;
+        this.message = message;
+    }
+
+    public OpenPgpError(OpenPgpError b) {
+        this.errorId = b.errorId;
+        this.message = b.message;
+    }
+
+    public int getErrorId() {
+        return errorId;
+    }
+
+    public void setErrorId(int errorId) {
+        this.errorId = errorId;
+    }
+
+    public String getMessage() {
+        return message;
+    }
+
+    public void setMessage(String message) {
+        this.message = message;
+    }
+
+    public int describeContents() {
+        return 0;
+    }
+
+    public void writeToParcel(Parcel dest, int flags) {
+        /**
+         * NOTE: When adding fields in the process of updating this API, make sure to bump
+         * {@link #PARCELABLE_VERSION}.
+         */
+        dest.writeInt(PARCELABLE_VERSION);
+        // Inject a placeholder that will store the parcel size from this point on
+        // (not including the size itself).
+        int sizePosition = dest.dataPosition();
+        dest.writeInt(0);
+        int startPosition = dest.dataPosition();
+        // version 1
+        dest.writeInt(errorId);
+        dest.writeString(message);
+        // Go back and write the size
+        int parcelableSize = dest.dataPosition() - startPosition;
+        dest.setDataPosition(sizePosition);
+        dest.writeInt(parcelableSize);
+        dest.setDataPosition(startPosition + parcelableSize);
+    }
+
+    public static final Creator<OpenPgpError> CREATOR = new Creator<OpenPgpError>() {
+        public OpenPgpError createFromParcel(final Parcel source) {
+            int parcelableVersion = source.readInt();
+            int parcelableSize = source.readInt();
+            int startPosition = source.dataPosition();
+
+            OpenPgpError error = new OpenPgpError();
+            error.errorId = source.readInt();
+            error.message = source.readString();
+
+            // skip over all fields added in future versions of this parcel
+            source.setDataPosition(startPosition + parcelableSize);
+
+            return error;
+        }
+
+        public OpenPgpError[] newArray(final int size) {
+            return new OpenPgpError[size];
+        }
+    };
+}

plugins/openpgp-api-library/src/org/openintents/openpgp/OpenPgpSignatureResult.java

@@ -0,0 +1,159 @@
+/*
+ * 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;
+
+import android.os.Parcel;
+import android.os.Parcelable;
+
+/**
+ * Parcelable versioning has been copied from Dashclock Widget
+ * https://code.google.com/p/dashclock/source/browse/api/src/main/java/com/google/android/apps/dashclock/api/ExtensionData.java
+ */
+public class OpenPgpSignatureResult implements Parcelable {
+    /**
+     * Since there might be a case where new versions of the client using the library getting
+     * old versions of the protocol (and thus old versions of this class), we need a versioning
+     * system for the parcels sent between the clients and the providers.
+     */
+    public static final int PARCELABLE_VERSION = 1;
+
+    // generic error on signature verification
+    public static final int SIGNATURE_ERROR = 0;
+    // successfully verified signature, with certified public key
+    public static final int SIGNATURE_SUCCESS_CERTIFIED = 1;
+    // no public key was found for this signature verification
+    public static final int SIGNATURE_UNKNOWN_PUB_KEY = 2;
+    // successfully verified signature, but with uncertified public key
+    public static final int SIGNATURE_SUCCESS_UNCERTIFIED = 3;
+
+    int status;
+    boolean signatureOnly;
+    String userId;
+    long keyId;
+
+    public int getStatus() {
+        return status;
+    }
+
+    public void setStatus(int status) {
+        this.status = status;
+    }
+
+    public boolean isSignatureOnly() {
+        return signatureOnly;
+    }
+
+    public void setSignatureOnly(boolean signatureOnly) {
+        this.signatureOnly = signatureOnly;
+    }
+
+    public String getUserId() {
+        return userId;
+    }
+
+    public void setUserId(String userId) {
+        this.userId = userId;
+    }
+
+    public long getKeyId() {
+        return keyId;
+    }
+
+    public void setKeyId(long keyId) {
+        this.keyId = keyId;
+    }
+
+    public OpenPgpSignatureResult() {
+
+    }
+
+    public OpenPgpSignatureResult(int signatureStatus, String signatureUserId,
+                                  boolean signatureOnly, long keyId) {
+        this.status = signatureStatus;
+        this.signatureOnly = signatureOnly;
+        this.userId = signatureUserId;
+        this.keyId = keyId;
+    }
+
+    public OpenPgpSignatureResult(OpenPgpSignatureResult b) {
+        this.status = b.status;
+        this.userId = b.userId;
+        this.signatureOnly = b.signatureOnly;
+        this.keyId = b.keyId;
+    }
+
+    public int describeContents() {
+        return 0;
+    }
+
+    public void writeToParcel(Parcel dest, int flags) {
+        /**
+         * NOTE: When adding fields in the process of updating this API, make sure to bump
+         * {@link #PARCELABLE_VERSION}.
+         */
+        dest.writeInt(PARCELABLE_VERSION);
+        // Inject a placeholder that will store the parcel size from this point on
+        // (not including the size itself).
+        int sizePosition = dest.dataPosition();
+        dest.writeInt(0);
+        int startPosition = dest.dataPosition();
+        // version 1
+        dest.writeInt(status);
+        dest.writeByte((byte) (signatureOnly ? 1 : 0));
+        dest.writeString(userId);
+        dest.writeLong(keyId);
+        // Go back and write the size
+        int parcelableSize = dest.dataPosition() - startPosition;
+        dest.setDataPosition(sizePosition);
+        dest.writeInt(parcelableSize);
+        dest.setDataPosition(startPosition + parcelableSize);
+    }
+
+    public static final Creator<OpenPgpSignatureResult> CREATOR = new Creator<OpenPgpSignatureResult>() {
+        public OpenPgpSignatureResult createFromParcel(final Parcel source) {
+            int parcelableVersion = source.readInt();
+            int parcelableSize = source.readInt();
+            int startPosition = source.dataPosition();
+
+            OpenPgpSignatureResult vr = new OpenPgpSignatureResult();
+            vr.status = source.readInt();
+            vr.signatureOnly = source.readByte() == 1;
+            vr.userId = source.readString();
+            vr.keyId = source.readLong();
+
+            // skip over all fields added in future versions of this parcel
+            source.setDataPosition(startPosition + parcelableSize);
+
+            return vr;
+        }
+
+        public OpenPgpSignatureResult[] newArray(final int size) {
+            return new OpenPgpSignatureResult[size];
+        }
+    };
+
+    @Override
+    public String toString() {
+        String out = new String();
+        out += "\nstatus: " + status;
+        out += "\nuserId: " + userId;
+        out += "\nsignatureOnly: " + signatureOnly;
+        out += "\nkeyId: " + keyId;
+        return out;
+    }
+
+}

plugins/openpgp-api-library/src/org/openintents/openpgp/util/OpenPgpApi.java

@@ -0,0 +1,261 @@
+/*
+ * 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.annotation.TargetApi;
+import android.content.Context;
+import android.content.Intent;
+import android.os.AsyncTask;
+import android.os.Build;
+import android.os.ParcelFileDescriptor;
+import android.util.Log;
+import org.openintents.openpgp.IOpenPgpService;
+import org.openintents.openpgp.OpenPgpError;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+public class OpenPgpApi {
+
+    public static final String TAG = "OpenPgp API";
+
+    public static final int API_VERSION = 3;
+    public static final String SERVICE_INTENT = "org.openintents.openpgp.IOpenPgpService";
+    
+    /**
+     * General extras
+     * --------------
+     *
+     * required extras:
+     * int           EXTRA_API_VERSION           (always required)
+     *
+     * returned extras:
+     * int           RESULT_CODE                 (RESULT_CODE_ERROR, RESULT_CODE_SUCCESS or RESULT_CODE_USER_INTERACTION_REQUIRED)
+     * OpenPgpError  RESULT_ERROR                (if RESULT_CODE == RESULT_CODE_ERROR)
+     * PendingIntent RESULT_INTENT               (if RESULT_CODE == RESULT_CODE_USER_INTERACTION_REQUIRED)
+     */
+
+    /**
+     * Sign only
+     *
+     * optional extras:
+     * boolean       EXTRA_REQUEST_ASCII_ARMOR   (request ascii armor for ouput)
+     * String        EXTRA_PASSPHRASE            (key passphrase)
+     */
+    public static final String ACTION_SIGN = "org.openintents.openpgp.action.SIGN";
+
+    /**
+     * Encrypt
+     *
+     * required extras:
+     * String[]      EXTRA_USER_IDS              (=emails of recipients, if more than one key has a user_id, a PendingIntent is returned via RESULT_INTENT)
+     * or
+     * long[]        EXTRA_KEY_IDS
+     *
+     * optional extras:
+     * boolean       EXTRA_REQUEST_ASCII_ARMOR   (request ascii armor for ouput)
+     * String        EXTRA_PASSPHRASE            (key passphrase)
+     */
+    public static final String ACTION_ENCRYPT = "org.openintents.openpgp.action.ENCRYPT";
+
+    /**
+     * Sign and encrypt
+     *
+     * required extras:
+     * String[]      EXTRA_USER_IDS              (=emails of recipients, if more than one key has a user_id, a PendingIntent is returned via RESULT_INTENT)
+     * or
+     * long[]        EXTRA_KEY_IDS
+     *
+     * optional extras:
+     * boolean       EXTRA_REQUEST_ASCII_ARMOR   (request ascii armor for ouput)
+     * String        EXTRA_PASSPHRASE            (key passphrase)
+     */
+    public static final String ACTION_SIGN_AND_ENCRYPT = "org.openintents.openpgp.action.SIGN_AND_ENCRYPT";
+
+    /**
+     * Decrypts and verifies given input stream. This methods handles encrypted-only, signed-and-encrypted,
+     * and also signed-only input.
+     *
+     * If OpenPgpSignatureResult.getStatus() == OpenPgpSignatureResult.SIGNATURE_UNKNOWN_PUB_KEY
+     * in addition a PendingIntent is returned via RESULT_INTENT to download missing keys.
+     *
+     * optional extras:
+     * boolean       EXTRA_REQUEST_ASCII_ARMOR   (request ascii armor for ouput)
+     *
+     * returned extras:
+     * OpenPgpSignatureResult   RESULT_SIGNATURE
+     */
+    public static final String ACTION_DECRYPT_VERIFY = "org.openintents.openpgp.action.DECRYPT_VERIFY";
+
+    /**
+     * Get key ids based on given user ids (=emails)
+     *
+     * required extras:
+     * String[]      EXTRA_USER_IDS
+     *
+     * returned extras:
+     * long[]        EXTRA_KEY_IDS
+     */
+    public static final String ACTION_GET_KEY_IDS = "org.openintents.openpgp.action.GET_KEY_IDS";
+
+    /**
+     * This action returns RESULT_CODE_SUCCESS if the OpenPGP Provider already has the key
+     * corresponding to the given key id in its database.
+     *
+     * It returns RESULT_CODE_USER_INTERACTION_REQUIRED if the Provider does not have the key.
+     * The PendingIntent from RESULT_INTENT can be used to retrieve those from a keyserver.
+     *
+     * required extras:
+     * long        EXTRA_KEY_ID
+     */
+    public static final String ACTION_GET_KEY = "org.openintents.openpgp.action.GET_KEY";
+
+    /* Intent extras */
+    public static final String EXTRA_API_VERSION = "api_version";
+
+    public static final String EXTRA_ACCOUNT_NAME = "account_name";
+
+    // SIGN, ENCRYPT, SIGN_AND_ENCRYPT, DECRYPT_VERIFY
+    // 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 EXTRA_REQUEST_ASCII_ARMOR = "ascii_armor";
+
+    // ENCRYPT, SIGN_AND_ENCRYPT
+    public static final String EXTRA_USER_IDS = "user_ids";
+    public static final String EXTRA_KEY_IDS = "key_ids";
+    // optional extras:
+    public static final String EXTRA_PASSPHRASE = "passphrase";
+
+    // GET_KEY
+    public static final String EXTRA_KEY_ID = "key_id";
+
+    /* Service Intent returns */
+    public static final String RESULT_CODE = "result_code";
+
+    // get actual error object from RESULT_ERROR
+    public static final int RESULT_CODE_ERROR = 0;
+    // success!
+    public static final int RESULT_CODE_SUCCESS = 1;
+    // get PendingIntent from RESULT_INTENT, start PendingIntent with startIntentSenderForResult,
+    // and execute service method again in onActivityResult
+    public static final int RESULT_CODE_USER_INTERACTION_REQUIRED = 2;
+
+    public static final String RESULT_ERROR = "error";
+    public static final String RESULT_INTENT = "intent";
+
+    // DECRYPT_VERIFY
+    public static final String RESULT_SIGNATURE = "signature";
+
+    IOpenPgpService mService;
+    Context mContext;
+
+    public OpenPgpApi(Context context, IOpenPgpService service) {
+        this.mContext = context;
+        this.mService = service;
+    }
+
+    public interface IOpenPgpCallback {
+        void onReturn(final Intent result);
+    }
+
+    private class OpenPgpAsyncTask extends AsyncTask<Void, Integer, Intent> {
+        Intent data;
+        InputStream is;
+        OutputStream os;
+        IOpenPgpCallback callback;
+
+        private OpenPgpAsyncTask(Intent data, InputStream is, OutputStream os, IOpenPgpCallback callback) {
+            this.data = data;
+            this.is = is;
+            this.os = os;
+            this.callback = callback;
+        }
+
+        @Override
+        protected Intent doInBackground(Void... unused) {
+            return executeApi(data, is, os);
+        }
+
+        protected void onPostExecute(Intent result) {
+            callback.onReturn(result);
+        }
+
+    }
+
+    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
+    public void executeApiAsync(Intent data, InputStream is, OutputStream os, IOpenPgpCallback callback) {
+        OpenPgpAsyncTask task = new OpenPgpAsyncTask(data, is, os, callback);
+
+        // don't serialize async tasks!
+        // http://commonsware.com/blog/2012/04/20/asynctask-threading-regression-confirmed.html
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
+            task.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, (Void[]) null);
+        } else {
+            task.execute((Void[]) null);
+        }
+    }
+
+    public Intent executeApi(Intent data, InputStream is, OutputStream os) {
+        try {
+            data.putExtra(EXTRA_API_VERSION, OpenPgpApi.API_VERSION);
+
+            Intent result = null;
+
+            if (ACTION_GET_KEY_IDS.equals(data.getAction())) {
+                result = mService.execute(data, null, null);
+                return result;
+            } else {
+                // pipe the input and output
+                ParcelFileDescriptor input = ParcelFileDescriptorUtil.pipeFrom(is,
+                        new ParcelFileDescriptorUtil.IThreadListener() {
+
+                            @Override
+                            public void onThreadFinished(Thread thread) {
+                                //Log.d(OpenPgpApi.TAG, "Copy to service finished");
+                            }
+                        });
+                ParcelFileDescriptor output = ParcelFileDescriptorUtil.pipeTo(os,
+                        new ParcelFileDescriptorUtil.IThreadListener() {
+
+                            @Override
+                            public void onThreadFinished(Thread thread) {
+                                //Log.d(OpenPgpApi.TAG, "Service finished writing!");
+                            }
+                        });
+
+                // blocks until result is ready
+                result = mService.execute(data, input, output);
+                // close() is required to halt the TransferThread
+                output.close();
+
+                // set class loader to current context to allow unparcelling
+                // of OpenPgpError and OpenPgpSignatureResult
+                // http://stackoverflow.com/a/3806769
+                result.setExtrasClassLoader(mContext.getClassLoader());
+
+                return result;
+            }
+        } catch (Exception e) {
+            Log.e(OpenPgpApi.TAG, "Exception", e);
+            Intent result = new Intent();
+            result.putExtra(RESULT_CODE, RESULT_CODE_ERROR);
+            result.putExtra(RESULT_ERROR,
+                    new OpenPgpError(OpenPgpError.CLIENT_SIDE_ERROR, e.getMessage()));
+            return result;
+        }
+    }
+
+}

plugins/openpgp-api-library/src/org/openintents/openpgp/util/OpenPgpListPreference.java

@@ -0,0 +1,257 @@
+/*
+ * 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.app.AlertDialog.Builder;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.content.Intent;
+import android.content.pm.ResolveInfo;
+import android.content.res.TypedArray;
+import android.graphics.drawable.Drawable;
+import android.net.Uri;
+import android.preference.DialogPreference;
+import android.util.AttributeSet;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ArrayAdapter;
+import android.widget.ListAdapter;
+import android.widget.TextView;
+import org.openintents.openpgp.R;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Does not extend ListPreference, but is very similar to it!
+ * http://grepcode.com/file_/repository.grepcode.com/java/ext/com.google.android/android/4.4_r1/android/preference/ListPreference.java/?v=source
+ */
+public class OpenPgpListPreference extends DialogPreference {
+    private static final String OPENKEYCHAIN_PACKAGE = "org.sufficientlysecure.keychain";
+    private static final String MARKET_INTENT_URI_BASE = "market://details?id=%s";
+    private static final Intent MARKET_INTENT = new Intent(Intent.ACTION_VIEW, Uri.parse(
+            String.format(MARKET_INTENT_URI_BASE, OPENKEYCHAIN_PACKAGE)));
+
+    private ArrayList<OpenPgpProviderEntry> mLegacyList = new ArrayList<OpenPgpProviderEntry>();
+    private ArrayList<OpenPgpProviderEntry> mList = new ArrayList<OpenPgpProviderEntry>();
+
+    private String mSelectedPackage;
+
+    public OpenPgpListPreference(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    public OpenPgpListPreference(Context context) {
+        this(context, null);
+    }
+
+    /**
+     * Public method to add new entries for legacy applications
+     *
+     * @param packageName
+     * @param simpleName
+     * @param icon
+     */
+    public void addLegacyProvider(int position, String packageName, String simpleName, Drawable icon) {
+        mLegacyList.add(position, new OpenPgpProviderEntry(packageName, simpleName, icon));
+    }
+
+    @Override
+    protected void onPrepareDialogBuilder(Builder builder) {
+        mList.clear();
+        
+        // add "none"-entry
+        mList.add(0, new OpenPgpProviderEntry("",
+                getContext().getString(R.string.openpgp_list_preference_none),
+                getContext().getResources().getDrawable(R.drawable.ic_action_cancel_launchersize_light)));
+        
+        // add all additional (legacy) providers
+        mList.addAll(mLegacyList);
+        
+        // search for OpenPGP providers...
+        ArrayList<OpenPgpProviderEntry> providerList = new ArrayList<OpenPgpProviderEntry>();
+        Intent intent = new Intent(OpenPgpApi.SERVICE_INTENT);
+        List<ResolveInfo> resInfo = getContext().getPackageManager().queryIntentServices(intent, 0);
+        if (!resInfo.isEmpty()) {
+            for (ResolveInfo resolveInfo : resInfo) {
+                if (resolveInfo.serviceInfo == null)
+                    continue;
+
+                String packageName = resolveInfo.serviceInfo.packageName;
+                String simpleName = String.valueOf(resolveInfo.serviceInfo.loadLabel(getContext()
+                        .getPackageManager()));
+                Drawable icon = resolveInfo.serviceInfo.loadIcon(getContext().getPackageManager());
+
+                providerList.add(new OpenPgpProviderEntry(packageName, simpleName, icon));
+            }
+        }
+
+        if (providerList.isEmpty()) {
+            // add install links if provider list is empty
+            resInfo = getContext().getPackageManager().queryIntentActivities
+                    (MARKET_INTENT, 0);
+            for (ResolveInfo resolveInfo : resInfo) {
+                Intent marketIntent = new Intent(MARKET_INTENT);
+                marketIntent.setPackage(resolveInfo.activityInfo.packageName);
+                Drawable icon = resolveInfo.activityInfo.loadIcon(getContext().getPackageManager());
+                String marketName = String.valueOf(resolveInfo.activityInfo.applicationInfo
+                        .loadLabel(getContext().getPackageManager()));
+                String simpleName = String.format(getContext().getString(R.string
+                        .openpgp_install_openkeychain_via), marketName);
+                mList.add(new OpenPgpProviderEntry(OPENKEYCHAIN_PACKAGE, simpleName,
+                        icon, marketIntent));
+            }
+        } else {
+            // add provider
+            mList.addAll(providerList);
+        }
+
+        // Init ArrayAdapter with OpenPGP Providers
+        ListAdapter adapter = new ArrayAdapter<OpenPgpProviderEntry>(getContext(),
+                android.R.layout.select_dialog_singlechoice, android.R.id.text1, mList) {
+            public View getView(int position, View convertView, ViewGroup parent) {
+                // User super class to create the View
+                View v = super.getView(position, convertView, parent);
+                TextView tv = (TextView) v.findViewById(android.R.id.text1);
+
+                // Put the image on the TextView
+                tv.setCompoundDrawablesWithIntrinsicBounds(mList.get(position).icon, null,
+                        null, null);
+
+                // Add margin between image and text (support various screen densities)
+                int dp10 = (int) (10 * getContext().getResources().getDisplayMetrics().density + 0.5f);
+                tv.setCompoundDrawablePadding(dp10);
+
+                return v;
+            }
+        };
+
+        builder.setSingleChoiceItems(adapter, getIndexOfProviderList(getValue()),
+                new DialogInterface.OnClickListener() {
+
+                    @Override
+                    public void onClick(DialogInterface dialog, int which) {
+                        OpenPgpProviderEntry entry = mList.get(which);
+
+                        if (entry.intent != null) {
+                            /*
+                             * Intents are called as activity
+                             *
+                             * Current approach is to assume the user installed the app.
+                             * If he does not, the selected package is not valid.
+                             *
+                             * However  applications should always consider this could happen,
+                             * as the user might remove the currently used OpenPGP app.
+                             */
+                            getContext().startActivity(entry.intent);
+                        }
+
+                        mSelectedPackage = entry.packageName;
+
+                        /*
+                         * Clicking on an item simulates the positive button click, and dismisses
+                         * the dialog.
+                         */
+                        OpenPgpListPreference.this.onClick(dialog, DialogInterface.BUTTON_POSITIVE);
+                        dialog.dismiss();
+                    }
+                });
+
+        /*
+         * The typical interaction for list-based dialogs is to have click-on-an-item dismiss the
+         * dialog instead of the user having to press 'Ok'.
+         */
+        builder.setPositiveButton(null, null);
+    }
+
+    @Override
+    protected void onDialogClosed(boolean positiveResult) {
+        super.onDialogClosed(positiveResult);
+
+        if (positiveResult && (mSelectedPackage != null)) {
+            if (callChangeListener(mSelectedPackage)) {
+                setValue(mSelectedPackage);
+            }
+        }
+    }
+
+    private int getIndexOfProviderList(String packageName) {
+        for (OpenPgpProviderEntry app : mList) {
+            if (app.packageName.equals(packageName)) {
+                return mList.indexOf(app);
+            }
+        }
+
+        return -1;
+    }
+
+    public void setValue(String packageName) {
+        mSelectedPackage = packageName;
+        persistString(packageName);
+    }
+
+    public String getValue() {
+        return mSelectedPackage;
+    }
+
+    public String getEntry() {
+        return getEntryByValue(mSelectedPackage);
+    }
+
+    @Override
+    protected Object onGetDefaultValue(TypedArray a, int index) {
+        return a.getString(index);
+    }
+
+    @Override
+    protected void onSetInitialValue(boolean restoreValue, Object defaultValue) {
+        setValue(restoreValue ? getPersistedString(mSelectedPackage) : (String) defaultValue);
+    }
+
+    public String getEntryByValue(String packageName) {
+        for (OpenPgpProviderEntry app : mList) {
+            if (app.packageName.equals(packageName)) {
+                return app.simpleName;
+            }
+        }
+
+        return null;
+    }
+
+    private static class OpenPgpProviderEntry {
+        private String packageName;
+        private String simpleName;
+        private Drawable icon;
+        private Intent intent;
+
+        public OpenPgpProviderEntry(String packageName, String simpleName, Drawable icon) {
+            this.packageName = packageName;
+            this.simpleName = simpleName;
+            this.icon = icon;
+        }
+
+        public OpenPgpProviderEntry(String packageName, String simpleName, Drawable icon, Intent intent) {
+            this(packageName, simpleName, icon);
+            this.intent = intent;
+        }
+
+        @Override
+        public String toString() {
+            return simpleName;
+        }
+    }
+}

plugins/openpgp-api-library/src/org/openintents/openpgp/util/OpenPgpServiceConnection.java

@@ -0,0 +1,88 @@
+/*
+ * 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 org.openintents.openpgp.IOpenPgpService;
+
+import android.content.ComponentName;
+import android.content.Context;
+import android.content.Intent;
+import android.content.ServiceConnection;
+import android.os.IBinder;
+
+public class OpenPgpServiceConnection {
+    private Context mApplicationContext;
+
+    private boolean mBound;
+    private IOpenPgpService mService;
+    private String mProviderPackageName;
+
+    public OpenPgpServiceConnection(Context context, String providerPackageName) {
+        this.mApplicationContext = context.getApplicationContext();
+        this.mProviderPackageName = providerPackageName;
+    }
+
+    public IOpenPgpService getService() {
+        return mService;
+    }
+
+    public boolean isBound() {
+        return mBound;
+    }
+
+    private ServiceConnection mServiceConnection = new ServiceConnection() {
+        public void onServiceConnected(ComponentName name, IBinder service) {
+            mService = IOpenPgpService.Stub.asInterface(service);
+            mBound = true;
+        }
+
+        public void onServiceDisconnected(ComponentName name) {
+            mService = null;
+            mBound = false;
+        }
+    };
+
+    /**
+     * If not already bound, bind to service!
+     *
+     * @return
+     */
+    public boolean bindToService() {
+        // if not already bound...
+        if (mService == null && !mBound) {
+            try {
+                Intent serviceIntent = new Intent();
+                serviceIntent.setAction(IOpenPgpService.class.getName());
+                // NOTE: setPackage is very important to restrict the intent to this provider only!
+                serviceIntent.setPackage(mProviderPackageName);
+                mApplicationContext.bindService(serviceIntent, mServiceConnection,
+                        Context.BIND_AUTO_CREATE);
+
+                return true;
+            } catch (Exception e) {
+                return false;
+            }
+        } else {
+            return true;
+        }
+    }
+
+    public void unbindFromService() {
+        mApplicationContext.unbindService(mServiceConnection);
+    }
+
+}

plugins/openpgp-api-library/src/org/openintents/openpgp/util/OpenPgpUtils.java

@@ -0,0 +1,64 @@
+/*
+ * 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 java.util.List;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import android.content.Context;
+import android.content.Intent;
+import android.content.pm.ResolveInfo;
+
+public class OpenPgpUtils {
+
+    public static final Pattern PGP_MESSAGE = Pattern.compile(
+            ".*?(-----BEGIN PGP MESSAGE-----.*?-----END PGP MESSAGE-----).*",
+            Pattern.DOTALL);
+
+    public static final Pattern PGP_SIGNED_MESSAGE = Pattern.compile(
+            ".*?(-----BEGIN PGP SIGNED MESSAGE-----.*?-----BEGIN PGP SIGNATURE-----.*?-----END PGP SIGNATURE-----).*",
+            Pattern.DOTALL);
+
+    public static final int PARSE_RESULT_NO_PGP = -1;
+    public static final int PARSE_RESULT_MESSAGE = 0;
+    public static final int PARSE_RESULT_SIGNED_MESSAGE = 1;
+
+    public static int parseMessage(String message) {
+        Matcher matcherSigned = PGP_SIGNED_MESSAGE.matcher(message);
+        Matcher matcherMessage = PGP_MESSAGE.matcher(message);
+
+        if (matcherMessage.matches()) {
+            return PARSE_RESULT_MESSAGE;
+        } else if (matcherSigned.matches()) {
+            return PARSE_RESULT_SIGNED_MESSAGE;
+        } else {
+            return PARSE_RESULT_NO_PGP;
+        }
+    }
+
+    public static boolean isAvailable(Context context) {
+        Intent intent = new Intent(OpenPgpApi.SERVICE_INTENT);
+        List<ResolveInfo> resInfo = context.getPackageManager().queryIntentServices(intent, 0);
+        if (!resInfo.isEmpty()) {
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+}

plugins/openpgp-api-library/src/org/openintents/openpgp/util/ParcelFileDescriptorUtil.java

@@ -0,0 +1,103 @@
+/*
+ * 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 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(OpenPgpApi.TAG, "TransferThread" + getId() + ": writing failed", e);
+            } finally {
+                try {
+                    mIn.close();
+                } catch (IOException e) {
+                    //Log.e(OpenPgpApi.TAG, "TransferThread" + getId(), e);
+                }
+                try {
+                    mOut.close();
+                } catch (IOException e) {
+                    //Log.e(OpenPgpApi.TAG, "TransferThread" + getId(), e);
+                }
+            }
+            if (mListener != null) {
+                //Log.d(OpenPgpApi.TAG, "TransferThread " + getId() + " finished!");
+                mListener.onThreadFinished(this);
+            }
+        }
+    }
+}

project.properties

@@ -17,3 +17,4 @@ android.library.reference.1=plugins/ActionBarSherlock/library
 android.library.reference.2=plugins/Android-PullToRefresh/library
 android.library.reference.3=plugins/ckChangeLog/library
 android.library.reference.4=plugins/HoloColorPicker
+android.library.reference.5=plugins/openpgp-api-library

res/layout/message_view_header.xml

@@ -252,4 +252,6 @@
 
     <include layout="@layout/message_view_crypto_layout" />
     
+    <include layout="@layout/message_view_openpgp_layout"/>
+
 </com.fsck.k9.view.MessageHeader>

res/layout/message_view_openpgp_layout.xml

@@ -0,0 +1,91 @@
+<?xml version="1.0" encoding="utf-8"?>
+<com.fsck.k9.view.MessageOpenPgpView xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/layout_decrypt_openpgp"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:orientation="horizontal"
+    android:visibility="gone" >
+
+    <LinearLayout
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_weight="1.00"
+        android:orientation="vertical"
+        android:padding="2dp" >
+
+        <TextView
+            android:id="@+id/openpgp_text"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center_vertical"
+            android:ellipsize="end"
+            android:gravity="center"
+            android:maxLines="1"
+            android:padding="2dp"
+            android:singleLine="true"
+            android:textAppearance="?android:attr/textAppearanceSmall"
+            android:textColor="?android:textColorPrimaryInverse"
+            android:textIsSelectable="false" />
+
+        <RelativeLayout
+            android:id="@+id/openpgp_signature_layout"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:gravity="center_vertical"
+            android:orientation="horizontal"
+            android:padding="2dp"
+            android:visibility="gone" >
+
+            <RelativeLayout
+                android:id="@+id/openpgp_signature_layout_image"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content" >
+
+                <ImageView
+                    android:id="@+id/openpgp_signature"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:src="@drawable/signed_large" />
+
+                <ImageView
+                    android:id="@+id/openpgp_signature_status"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:src="@drawable/overlay_error" />
+            </RelativeLayout>
+
+            <TextView
+                android:id="@+id/openpgp_user_id"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_centerVertical="true"
+                android:layout_toRightOf="@+id/openpgp_signature_layout_image"
+                android:ellipsize="end"
+                android:paddingLeft="5dip"
+                android:text="User Id"
+                android:textAppearance="?android:attr/textAppearanceMedium"
+                android:textColor="?android:textColorPrimaryInverse" />
+        </RelativeLayout>
+    </LinearLayout>
+
+    <Button
+        android:id="@+id/openpgp_get_key"
+        style="?android:attr/buttonStyleSmall"
+        android:layout_width="100dp"
+        android:layout_height="wrap_content"
+        android:layout_alignParentRight="true"
+        android:layout_alignTop="@+id/openpgp_signature_layout_image"
+        android:layout_gravity="center_vertical"
+        android:text="@string/openpgp_get_key"
+        android:visibility="gone" />
+
+    <ProgressBar
+        android:id="@+id/openpgp_progress"
+        style="?android:attr/progressBarStyleSmallInverse"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center_vertical"
+        android:padding="4dp"
+        android:visibility="gone" />
+
+</com.fsck.k9.view.MessageOpenPgpView>

res/values/arrays.xml

@@ -634,16 +634,6 @@
         <item>10</item>
     </string-array>
 
-    <string-array name="account_settings_crypto_app_entries">
-        <item>@string/account_settings_crypto_app_none</item>
-        <item>APG</item>
-    </string-array>
-
-    <string-array name="account_settings_crypto_app_values" translatable="false">
-        <item></item>
-        <item>apg</item>
-    </string-array>
-
     <string-array name="settings_preview_lines_values" translatable="false">
         <item>0</item>
         <item>1</item>

res/values/colors.xml

@@ -1,4 +1,9 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
     <color name="message_list_item_footer_background">#eeeeee</color>
+    
+    <color name="openpgp_red">#CC0000</color>
+    <color name="openpgp_orange">#FF8800</color>
+    <color name="openpgp_green">#669900</color>
+    <color name="openpgp_blue">#336699</color>
 </resources>

res/values/strings.xml

@@ -1154,4 +1154,19 @@ Please submit bug reports, contribute new features and ask questions at
     <string name="fetching_attachment_dialog_title_send">Sending message</string>
     <string name="fetching_attachment_dialog_title_save">Saving draft</string>
     <string name="fetching_attachment_dialog_message">Fetching attachment…</string>
+    
+    <!-- === OpenPGP specific ================================================================== -->
+    <string name="openpgp_decrypting_verifying">Decrypting/Verifying…</string>
+    <string name="openpgp_successful_decryption">Successful decryption</string>
+    <string name="openpgp_signature_valid_certified">Valid signature (certified)</string>
+    <string name="openpgp_signature_valid_uncertified">Valid signature but uncertified</string>
+    <string name="openpgp_signature_unknown">Unknown signer</string>
+    <string name="openpgp_signature_invalid">Invalid signature</string>
+    <string name="openpgp_signature_unknown_text">Missing public key for this signature</string>
+    <string name="openpgp_successful_decryption_valid_signature_certified">Successful decryption and valid signature (certified)</string>
+    <string name="openpgp_successful_decryption_valid_signature_uncertified">Successful decryption and valid signature but uncertified</string>
+    <string name="openpgp_successful_decryption_unknown_signature">Successful decryption but missing public key</string>
+    <string name="openpgp_get_key">Lookup missing key</string>
+    <string name="openpgp_error">OpenPGP Error:</string>
+
 </resources>

res/xml/account_settings_preferences.xml

@@ -464,13 +464,10 @@
         android:title="@string/account_settings_crypto"
         android:key="crypto">
 
-        <ListPreference
+        <org.openintents.openpgp.util.OpenPgpListPreference
             android:persistent="false"
             android:key="crypto_app"
-            android:title="@string/account_settings_crypto_app"
-            android:entries="@array/account_settings_crypto_app_entries"
-            android:entryValues="@array/account_settings_crypto_app_values"
-            android:dialogTitle="@string/account_settings_crypto_app" />
+            android:title="@string/account_settings_crypto_app" />
 
         <CheckBoxPreference
             android:persistent="false"

settings.gradle

@@ -2,3 +2,4 @@ include ':plugins:ActionBarSherlock:library'
 include ':plugins:Android-PullToRefresh:library'
 include ':plugins:ckChangeLog:library'
 include ':plugins:HoloColorPicker'
+include ':plugins:openpgp-api-library'

src/com/fsck/k9/Account.java

@@ -1719,6 +1719,14 @@ public class Account implements BaseAccount {
         return mCryptoProvider;
     }
     
+    public synchronized String getOpenPgpProvider() {
+        // return null if set to "APG" or "None"
+        if (getCryptoApp().equals("apg") || getCryptoApp().equals("")) {
+            return null;
+        }
+        return getCryptoApp();
+    }
+
     public synchronized NotificationSetting getNotificationSetting() {
         return mNotificationSetting;
     }

src/com/fsck/k9/activity/MessageCompose.java

@@ -3,12 +3,14 @@ package com.fsck.k9.activity;
 
 import android.annotation.TargetApi;
 import android.app.AlertDialog;
+import android.app.PendingIntent;
 import android.app.AlertDialog.Builder;
 import android.app.Dialog;
 import android.content.ClipData;
 import android.content.Context;
 import android.content.DialogInterface;
 import android.content.Intent;
+import android.content.IntentSender.SendIntentException;
 import android.content.pm.ActivityInfo;
 import android.net.Uri;
 import android.os.AsyncTask;
@@ -25,6 +27,7 @@ import android.util.AttributeSet;
 import android.util.Log;
 import android.util.TypedValue;
 import android.view.LayoutInflater;
+
 import com.actionbarsherlock.view.Menu;
 import com.actionbarsherlock.view.MenuItem;
 import com.actionbarsherlock.view.Window;
@@ -47,6 +50,7 @@ import android.widget.LinearLayout;
 import android.widget.MultiAutoCompleteTextView;
 import android.widget.TextView;
 import android.widget.Toast;
+
 import com.fsck.k9.Account;
 import com.fsck.k9.Account.MessageFormat;
 import com.fsck.k9.Account.QuoteStyle;
@@ -88,13 +92,21 @@ import com.fsck.k9.mail.store.LocalStore.LocalAttachmentBody;
 import com.fsck.k9.mail.store.LocalStore.TempFileBody;
 import com.fsck.k9.mail.store.LocalStore.TempFileMessageBody;
 import com.fsck.k9.view.MessageWebView;
+
 import org.apache.james.mime4j.codec.EncoderUtil;
 import org.apache.james.mime4j.util.MimeUtil;
 import org.htmlcleaner.CleanerProperties;
 import org.htmlcleaner.HtmlCleaner;
 import org.htmlcleaner.SimpleHtmlSerializer;
 import org.htmlcleaner.TagNode;
+import org.openintents.openpgp.OpenPgpError;
+import org.openintents.openpgp.util.OpenPgpApi;
+import org.openintents.openpgp.util.OpenPgpServiceConnection;
 
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.InputStream;
+import java.io.UnsupportedEncodingException;
 import java.text.DateFormat;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -180,6 +192,8 @@ public class MessageCompose extends K9Activity implements OnClickListener,
 
     private static final Account[] EMPTY_ACCOUNT_ARRAY = new Account[0];
     
+    private static final int REQUEST_CODE_SIGN_ENCRYPT = 12;
+
     /**
      * Regular expression to remove the first localized "Re:" prefix in subjects.
      *
@@ -302,6 +316,9 @@ public class MessageCompose extends K9Activity implements OnClickListener,
     private boolean mAutoEncrypt = false;
     private boolean mContinueWithoutPublicKey = false;
     
+    private String mOpenPgpProvider;
+    private OpenPgpServiceConnection mOpenPgpServiceConnection;
+    
     private String mReferences;
     private String mInReplyTo;
     private Menu mMenu;
@@ -826,6 +843,12 @@ public class MessageCompose extends K9Activity implements OnClickListener,
 
         mEncryptLayout = findViewById(R.id.layout_encrypt);
         mCryptoSignatureCheckbox = (CheckBox)findViewById(R.id.cb_crypto_signature);
+        mCryptoSignatureCheckbox.setOnCheckedChangeListener(new OnCheckedChangeListener() {
+            @Override
+            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
+                updateMessageFormat();
+            }
+        });
         mCryptoSignatureUserId = (TextView)findViewById(R.id.userId);
         mCryptoSignatureUserIdRest = (TextView)findViewById(R.id.userIdRest);
         mEncryptCheckbox = (CheckBox)findViewById(R.id.cb_encrypt);
@@ -843,8 +866,35 @@ public class MessageCompose extends K9Activity implements OnClickListener,
         }
 
         initializeCrypto();
+        
         final CryptoProvider crypto = mAccount.getCryptoProvider();
-        if (crypto.isAvailable(this)) {
+        mOpenPgpProvider = mAccount.getOpenPgpProvider();
+        if (mOpenPgpProvider != null) {
+            // New OpenPGP Provider API
+
+            // bind to service
+            mOpenPgpServiceConnection = new OpenPgpServiceConnection(this, mOpenPgpProvider);
+            mOpenPgpServiceConnection.bindToService();
+            
+            mEncryptLayout.setVisibility(View.VISIBLE);
+            mCryptoSignatureCheckbox.setOnClickListener(new OnClickListener() {
+                @Override
+                public void onClick(View v) {
+                    CheckBox checkBox = (CheckBox) v;
+                    if (checkBox.isChecked()) {
+                        mPreventDraftSaving = true;
+                    }
+                }
+            });
+
+            if (mAccount.getCryptoAutoSignature()) {
+                // TODO: currently disabled for new openpgp providers (see AccountSettings)
+            }
+            updateMessageFormat();
+            // TODO: currently disabled for new openpgp providers (see AccountSettings)
+            mAutoEncrypt = false;
+            //mAutoEncrypt = mAccount.isCryptoAutoEncrypt();
+        } else if (crypto.isAvailable(this)) {
             mEncryptLayout.setVisibility(View.VISIBLE);
             mCryptoSignatureCheckbox.setOnClickListener(new OnClickListener() {
                 @Override
@@ -895,6 +945,15 @@ public class MessageCompose extends K9Activity implements OnClickListener,
         setTitle();
     }
     
+    @Override
+    public void onDestroy() {
+        super.onDestroy();
+
+        if (mOpenPgpServiceConnection != null) {
+            mOpenPgpServiceConnection.unbindFromService();
+        }
+    }
+
     /**
      * Handle external intents that trigger the message compose activity.
      *
@@ -1849,36 +1908,66 @@ public class MessageCompose extends K9Activity implements OnClickListener,
 
     private void performSend() {
         final CryptoProvider crypto = mAccount.getCryptoProvider();
-        if (mEncryptCheckbox.isChecked() && !mPgpData.hasEncryptionKeys()) {
-            // key selection before encryption
-            StringBuilder emails = new StringBuilder();
-            for (Address address : getRecipientAddresses()) {
+        
+        if (mOpenPgpProvider != null) {
+            // OpenPGP Provider API
+
+            // If not already encrypted but user wants to encrypt...
+            if (mPgpData.getEncryptedData() == null &&
+                    (mEncryptCheckbox.isChecked() || mCryptoSignatureCheckbox.isChecked())) {
+
+                String[] emailsArray = null;
+                if (mEncryptCheckbox.isChecked()) {
+                    // get emails as array
+                    ArrayList<String> emails = new ArrayList<String>();
+
+                    for (Address address : getRecipientAddresses()) {
+                        emails.add(address.getAddress());
+                    }
+                    emailsArray = emails.toArray(new String[emails.size()]);
+                }
+                    if (mEncryptCheckbox.isChecked() && mCryptoSignatureCheckbox.isChecked()) {
+                        Intent intent = new Intent(OpenPgpApi.ACTION_SIGN_AND_ENCRYPT);
+                        intent.putExtra(OpenPgpApi.EXTRA_USER_IDS, emailsArray);
+                        executeOpenPgpMethod(intent);
+                    } else if (mCryptoSignatureCheckbox.isChecked()) {
+                        String text = buildText(false).getText();
+                        Intent intent = new Intent(OpenPgpApi.ACTION_SIGN);
+                        executeOpenPgpMethod(intent);
+                    } else if (mEncryptCheckbox.isChecked()) {
+                        Intent intent = new Intent(OpenPgpApi.ACTION_ENCRYPT);
+                        intent.putExtra(OpenPgpApi.EXTRA_USER_IDS, emailsArray);
+                        executeOpenPgpMethod(intent);
+                    }
+
+                // onSend() is called again in SignEncryptCallback and with
+                // encryptedData set in pgpData!
+                return;
+            }
+        } else if (crypto.isAvailable(this)) {
+            // Legacy APG API
+            
+            if (mEncryptCheckbox.isChecked() && !mPgpData.hasEncryptionKeys()) {
+                // key selection before encryption
+                StringBuilder emails = new StringBuilder();
+                for (Address address : getRecipientAddresses()) {
+                    if (emails.length() != 0) {
+                        emails.append(',');
+                    }
+                    emails.append(address.getAddress());
+                    if (!mContinueWithoutPublicKey &&
+                            !crypto.hasPublicKeyForEmail(this, address.getAddress())) {
+                        showDialog(DIALOG_CONTINUE_WITHOUT_PUBLIC_KEY);
+                        return;
+                    }
+                }
                 if (emails.length() != 0) {
                     emails.append(',');
                 }
-                emails.append(address.getAddress());
-                if (!mContinueWithoutPublicKey &&
-                        !crypto.hasPublicKeyForEmail(this, address.getAddress())) {
-                    showDialog(DIALOG_CONTINUE_WITHOUT_PUBLIC_KEY);
-                    return;
-                }
-            }
-            if (emails.length() != 0) {
-                emails.append(',');
-            }
-            emails.append(mIdentity.getEmail());
+                emails.append(mIdentity.getEmail());
 
-            mPreventDraftSaving = true;
-            if (!crypto.selectEncryptionKeys(MessageCompose.this, emails.toString(), mPgpData)) {
-                mPreventDraftSaving = false;
-            }
-            return;
-        }
-        if (mPgpData.hasEncryptionKeys() || mPgpData.hasSignatureKey()) {
-            if (mPgpData.getEncryptedData() == null) {
-                String text = buildText(false).getText();
                 mPreventDraftSaving = true;
-                if (!crypto.encrypt(this, text, mPgpData)) {
+                if (!crypto.selectEncryptionKeys(MessageCompose.this, emails.toString(), mPgpData)) {
                     mPreventDraftSaving = false;
                 }
                 return;
@@ -1900,6 +1989,99 @@ public class MessageCompose extends K9Activity implements OnClickListener,
         finish();
     }
     
+    private InputStream getOpenPgpInputStream() {
+        String text = buildText(false).getText();
+
+        InputStream is = null;
+        try {
+            is = new ByteArrayInputStream(text.getBytes("UTF-8"));
+        } catch (UnsupportedEncodingException e) {
+            Log.e(K9.LOG_TAG, "UnsupportedEncodingException.", e);
+        }
+        return is;
+    }
+    
+    private void executeOpenPgpMethod(Intent intent) {
+        intent.putExtra(OpenPgpApi.EXTRA_REQUEST_ASCII_ARMOR, true);
+        // this follows user id format of OpenPGP to allow key generation based on it
+        // includes account number to make it unique
+        String accName = mIdentity.getName() + " <" + mIdentity.getEmail() + ">";
+        intent.putExtra(OpenPgpApi.EXTRA_ACCOUNT_NAME, accName);
+
+        final InputStream is = getOpenPgpInputStream();
+        final ByteArrayOutputStream os = new ByteArrayOutputStream();
+
+        SignEncryptCallback callback = new SignEncryptCallback(os, REQUEST_CODE_SIGN_ENCRYPT);
+
+        OpenPgpApi api = new OpenPgpApi(this, mOpenPgpServiceConnection.getService());
+        api.executeApiAsync(intent, is, os, callback);
+    }
+    
+    /**
+     * Called on successful encrypt/verify
+     */
+    private class SignEncryptCallback implements OpenPgpApi.IOpenPgpCallback {
+        ByteArrayOutputStream os;
+        int requestCode;
+
+        private SignEncryptCallback(ByteArrayOutputStream os, int requestCode) {
+            this.os = os;
+            this.requestCode = requestCode;
+        }
+
+        @Override
+        public void onReturn(Intent result) {
+            switch (result.getIntExtra(OpenPgpApi.RESULT_CODE, OpenPgpApi.RESULT_CODE_ERROR)) {
+                case OpenPgpApi.RESULT_CODE_SUCCESS: {
+                    try {
+                        final String output = os.toString("UTF-8");
+
+                        if (K9.DEBUG)
+                            Log.d(OpenPgpApi.TAG, "result: " + os.toByteArray().length
+                                    + " str=" + output);
+
+                        mPgpData.setEncryptedData(output);
+                        onSend();
+                    } catch (UnsupportedEncodingException e) {
+                        Log.e(K9.LOG_TAG, "UnsupportedEncodingException", e);
+                    }
+
+                    break;
+                }
+                case OpenPgpApi.RESULT_CODE_USER_INTERACTION_REQUIRED: {
+                    PendingIntent pi = result.getParcelableExtra(OpenPgpApi.RESULT_INTENT);
+                    try {
+                        startIntentSenderForResult(pi.getIntentSender(),
+                                requestCode, null, 0, 0, 0);
+                    } catch (SendIntentException e) {
+                        Log.e(K9.LOG_TAG, "SendIntentException", e);
+                    }
+                    break;
+                }
+                case OpenPgpApi.RESULT_CODE_ERROR: {
+                    OpenPgpError error = result.getParcelableExtra(OpenPgpApi.RESULT_ERROR);
+                    handleOpenPgpErrors(error);
+                    break;
+                }
+            }
+        }
+    }
+    
+    private void handleOpenPgpErrors(final OpenPgpError error) {
+        runOnUiThread(new Runnable() {
+
+            @Override
+            public void run() {
+                Log.e(K9.LOG_TAG, "OpenPGP Error ID:" + error.getErrorId());
+                Log.e(K9.LOG_TAG, "OpenPGP Error Message:" + error.getMessage());
+                
+                Toast.makeText(MessageCompose.this,
+                        getString(R.string.openpgp_error) + " " + error.getMessage(),
+                        Toast.LENGTH_LONG).show();
+            }
+        });
+    }
+
     private void onDiscard() {
         if (mDraftId != INVALID_DRAFT_ID) {
             MessagingController.getInstance(getApplication()).deleteDraft(mAccount, mDraftId);
@@ -1984,7 +2166,7 @@ public class MessageCompose extends K9Activity implements OnClickListener,
      *         The MIME type we want our attachment to have.
      */
     private void onAddAttachment2(final String mime_type) {
-        if (mAccount.getCryptoProvider().isAvailable(this)) {
+        if (mAccount.getCryptoProvider().isAvailable(this) || mAccount.getOpenPgpProvider() != null) {
             Toast.makeText(this, R.string.attachment_encryption_unsupported, Toast.LENGTH_LONG).show();
         }
         Intent i = new Intent(Intent.ACTION_GET_CONTENT);
@@ -2170,6 +2352,19 @@ public class MessageCompose extends K9Activity implements OnClickListener,
         // if a CryptoSystem activity is returning, then mPreventDraftSaving was set to true
         mPreventDraftSaving = false;
         
+        // OpenPGP: try again after user interaction
+        if (resultCode == RESULT_OK && requestCode == REQUEST_CODE_SIGN_ENCRYPT) {
+            /*
+             * The data originally given to the pgp method are are again
+             * returned here to be used when calling again after user
+             * interaction. They also contain results from the user interaction
+             * which happened, for example selected key ids.
+             */
+            executeOpenPgpMethod(data);
+
+            return;
+        }
+
         if (mAccount.getCryptoProvider().onActivityResult(this, requestCode, resultCode, data, mPgpData)) {
             return;
         }

src/com/fsck/k9/activity/MessageList.java

@@ -51,7 +51,9 @@ import com.fsck.k9.search.SearchSpecification.Attribute;
 import com.fsck.k9.search.SearchSpecification.Searchfield;
 import com.fsck.k9.search.SearchSpecification.SearchCondition;
 import com.fsck.k9.view.MessageHeader;
+import com.fsck.k9.view.MessageOpenPgpView;
 import com.fsck.k9.view.MessageTitleView;
+import com.fsck.k9.view.SingleMessageView;
 import com.fsck.k9.view.ViewSwitcher;
 import com.fsck.k9.view.ViewSwitcher.OnSwitchCompleteListener;
 
@@ -1568,4 +1570,18 @@ public class MessageList extends K9FragmentActivity implements MessageListFragme
             removeMessageViewFragment();
         }
     }
+
+    @Override
+    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
+        super.onActivityResult(requestCode, resultCode, data);
+
+        // handle OpenPGP results from PendingIntents in OpenPGP view
+        // must be handled in this main activity, because startIntentSenderForResult() does not support Fragments
+        MessageOpenPgpView openPgpView = (MessageOpenPgpView) findViewById(R.id.layout_decrypt_openpgp);
+        if (openPgpView != null && openPgpView.handleOnActivityResult(requestCode, resultCode, data)) {
+            return;
+        }
+    }
+    
+    
 }

src/com/fsck/k9/activity/setup/AccountSettings.java

@@ -2,11 +2,15 @@
 package com.fsck.k9.activity.setup;
 
 import android.app.Dialog;
+
 import java.util.Iterator;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
 
+import org.openintents.openpgp.util.OpenPgpListPreference;
+import org.openintents.openpgp.util.OpenPgpUtils;
+
 import android.content.Context;
 import android.content.Intent;
 import android.content.SharedPreferences;
@@ -171,7 +175,7 @@ public class AccountSettings extends K9PreferenceActivity {
     private ListPreference mIdleRefreshPeriod;
     private ListPreference mMaxPushFolders;
     private boolean mHasCrypto = false;
-    private ListPreference mCryptoApp;
+    private OpenPgpListPreference mCryptoApp;
     private CheckBoxPreference mCryptoAutoSignature;
     private CheckBoxPreference mCryptoAutoEncrypt;
 
@@ -689,16 +693,21 @@ public class AccountSettings extends K9PreferenceActivity {
             }
         });
 
-        mHasCrypto = new Apg().isAvailable(this);
+        mHasCrypto = (new Apg().isAvailable(this) || OpenPgpUtils.isAvailable(this));
         if (mHasCrypto) {
-            mCryptoApp = (ListPreference) findPreference(PREFERENCE_CRYPTO_APP);
+            mCryptoApp = (OpenPgpListPreference) findPreference(PREFERENCE_CRYPTO_APP);
+
+            // add "apg"
+            if (new Apg().isAvailable(this)) {
+                mCryptoApp.addLegacyProvider(0, "apg", "APG", null);
+            }
+            
             mCryptoApp.setValue(String.valueOf(mAccount.getCryptoApp()));
             mCryptoApp.setSummary(mCryptoApp.getEntry());
             mCryptoApp.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
                 public boolean onPreferenceChange(Preference preference, Object newValue) {
                     String value = newValue.toString();
-                    int index = mCryptoApp.findIndexOfValue(value);
-                    mCryptoApp.setSummary(mCryptoApp.getEntries()[index]);
+                    mCryptoApp.setSummary(mCryptoApp.getEntryByValue(value));
                     mCryptoApp.setValue(value);
                     handleCryptoAppDependencies();
                     if (Apg.NAME.equals(value)) {
@@ -743,12 +752,12 @@ public class AccountSettings extends K9PreferenceActivity {
     }
 
     private void handleCryptoAppDependencies() {
-        if ("".equals(mCryptoApp.getValue())) {
-            mCryptoAutoSignature.setEnabled(false);
-            mCryptoAutoEncrypt.setEnabled(false);
-        } else {
+        if ("apg".equals(mCryptoApp.getValue())) {
             mCryptoAutoSignature.setEnabled(true);
             mCryptoAutoEncrypt.setEnabled(true);
+        } else {
+            mCryptoAutoSignature.setEnabled(false);
+            mCryptoAutoEncrypt.setEnabled(false);
         }
     }
 

src/com/fsck/k9/crypto/CryptoHelper.java

@@ -0,0 +1,77 @@
+
+package com.fsck.k9.crypto;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import com.fsck.k9.mail.Message;
+import com.fsck.k9.mail.MessagingException;
+import com.fsck.k9.mail.Part;
+import com.fsck.k9.mail.internet.MimeUtility;
+
+public class CryptoHelper {
+
+    public static Pattern PGP_MESSAGE =
+            Pattern.compile(".*?(-----BEGIN PGP MESSAGE-----.*?-----END PGP MESSAGE-----).*",
+                    Pattern.DOTALL);
+
+    public static Pattern PGP_SIGNED_MESSAGE =
+            Pattern.compile(
+                    ".*?(-----BEGIN PGP SIGNED MESSAGE-----.*?-----BEGIN PGP SIGNATURE-----.*?-----END PGP SIGNATURE-----).*",
+                    Pattern.DOTALL);
+
+    public CryptoHelper() {
+        super();
+    }
+
+    /**
+     * TODO: use new parseMessage() from PgpUtils to actually parse!
+     * @param message
+     * @return
+     */
+    public boolean isEncrypted(Message message) {
+        String data = null;
+        try {
+            Part part = MimeUtility.findFirstPartByMimeType(message, "text/plain");
+            if (part == null) {
+                part = MimeUtility.findFirstPartByMimeType(message, "text/html");
+            }
+            if (part != null) {
+                data = MimeUtility.getTextFromPart(part);
+            }
+        } catch (MessagingException e) {
+            // guess not...
+            // TODO: maybe log this?
+        }
+
+        if (data == null) {
+            return false;
+        }
+
+        Matcher matcher = PGP_MESSAGE.matcher(data);
+        return matcher.matches();
+    }
+
+    public boolean isSigned(Message message) {
+        String data = null;
+        try {
+            Part part = MimeUtility.findFirstPartByMimeType(message, "text/plain");
+            if (part == null) {
+                part = MimeUtility.findFirstPartByMimeType(message, "text/html");
+            }
+            if (part != null) {
+                data = MimeUtility.getTextFromPart(part);
+            }
+        } catch (MessagingException e) {
+            // guess not...
+            // TODO: maybe log this?
+        }
+
+        if (data == null) {
+            return false;
+        }
+
+        Matcher matcher = PGP_SIGNED_MESSAGE.matcher(data);
+        return matcher.matches();
+    }
+}

src/com/fsck/k9/crypto/PgpData.java

@@ -2,6 +2,8 @@ package com.fsck.k9.crypto;
 
 import java.io.Serializable;
 
+import org.openintents.openpgp.OpenPgpSignatureResult;
+
 public class PgpData implements Serializable {
     private static final long serialVersionUID = 6314045536470848410L;
     protected long mEncryptionKeyIds[] = null;
@@ -12,6 +14,17 @@ public class PgpData implements Serializable {
     protected String mDecryptedData = null;
     protected String mEncryptedData = null;
     
+    // new API
+    protected OpenPgpSignatureResult mSignatureResult;
+
+    public OpenPgpSignatureResult getSignatureResult() {
+        return mSignatureResult;
+    }
+
+    public void setSignatureResult(OpenPgpSignatureResult signatureResult) {
+        this.mSignatureResult = signatureResult;
+    }
+
     public void setSignatureKeyId(long keyId) {
         mSignatureKeyId = keyId;
     }

src/com/fsck/k9/fragment/MessageViewFragment.java

@@ -4,6 +4,8 @@ import java.io.File;
 import java.util.Collections;
 import java.util.Locale;
 
+import org.openintents.openpgp.OpenPgpSignatureResult;
+
 import android.app.Activity;
 import android.content.Context;
 import android.content.Intent;
@@ -715,6 +717,21 @@ public class MessageViewFragment extends SherlockFragment implements OnClickList
         }
     }
     
+    /**
+     * Used by MessageOpenPgpView
+     */
+    public void setMessageWithOpenPgp(String decryptedData, OpenPgpSignatureResult signatureResult) {
+        try {
+            // TODO: get rid of PgpData?
+            PgpData data = new PgpData();
+            data.setDecryptedData(decryptedData);
+            data.setSignatureResult(signatureResult);
+            mMessageView.setMessage(mAccount, (LocalMessage) mMessage, data, mController, mListener);
+        } catch (MessagingException e) {
+            Log.e(K9.LOG_TAG, "displayMessageBody failed", e);
+        }
+    }
+
     // This REALLY should be in MessageCryptoView
     @Override
     public void onDecryptDone(PgpData pgpData) {

src/com/fsck/k9/view/MessageOpenPgpView.java

@@ -0,0 +1,416 @@
+
+package com.fsck.k9.view;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.InputStream;
+import java.io.UnsupportedEncodingException;
+
+import org.openintents.openpgp.OpenPgpError;
+import org.openintents.openpgp.OpenPgpSignatureResult;
+import org.openintents.openpgp.util.OpenPgpApi;
+import org.openintents.openpgp.util.OpenPgpServiceConnection;
+
+import android.app.Activity;
+import android.app.PendingIntent;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentSender.SendIntentException;
+import android.support.v4.app.Fragment;
+import android.util.AttributeSet;
+import android.util.Log;
+import android.view.View;
+import android.widget.Button;
+import android.widget.ImageView;
+import android.widget.LinearLayout;
+import android.widget.ProgressBar;
+import android.widget.RelativeLayout;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import com.fsck.k9.Account;
+import com.fsck.k9.K9;
+import com.fsck.k9.R;
+import com.fsck.k9.crypto.CryptoHelper;
+import com.fsck.k9.fragment.MessageViewFragment;
+import com.fsck.k9.mail.Message;
+import com.fsck.k9.mail.MessagingException;
+import com.fsck.k9.mail.Part;
+import com.fsck.k9.mail.internet.MimeUtility;
+
+public class MessageOpenPgpView extends LinearLayout {
+
+    private Context mContext;
+    private MessageViewFragment mFragment;
+    private RelativeLayout mSignatureLayout = null;
+    private ImageView mSignatureStatusImage = null;
+    private TextView mSignatureUserId = null;
+    private TextView mText = null;
+    private ProgressBar mProgress;
+    private Button mGetKeyButton;
+
+    private OpenPgpServiceConnection mOpenPgpServiceConnection;
+    private OpenPgpApi mOpenPgpApi;
+
+    private String mOpenPgpProvider;
+    private String mDecryptedData;
+    private Message mMessage;
+
+    private PendingIntent mMissingKeyPI;
+
+    private static final int REQUEST_CODE_DECRYPT_VERIFY = 12;
+
+    String mData;
+    Account mAccount;
+
+    public MessageOpenPgpView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        mContext = context;
+    }
+
+    public void setupChildViews() {
+        mSignatureLayout = (RelativeLayout) findViewById(R.id.openpgp_signature_layout);
+        mSignatureStatusImage = (ImageView) findViewById(R.id.openpgp_signature_status);
+        mSignatureUserId = (TextView) findViewById(R.id.openpgp_user_id);
+        mText = (TextView) findViewById(R.id.openpgp_text);
+        mProgress = (ProgressBar) findViewById(R.id.openpgp_progress);
+        mGetKeyButton = (Button) findViewById(R.id.openpgp_get_key);
+
+        mGetKeyButton.setOnClickListener(new OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                getMissingKey();
+            }
+        });
+    }
+
+    public void setFragment(Fragment fragment) {
+        mFragment = (MessageViewFragment) fragment;
+    }
+
+    /**
+     * Fill the decrypt layout with signature data, if known, make controls
+     * visible, if they should be visible.
+     */
+    public void updateLayout(Account account, String decryptedData,
+            final OpenPgpSignatureResult signatureResult,
+            final Message message) {
+
+        // set class variables
+        mAccount = account;
+        mOpenPgpProvider = mAccount.getOpenPgpProvider();
+        mDecryptedData = decryptedData;
+        mMessage = message;
+
+        // only use this view if a OpenPGP Provider is set
+        if (mOpenPgpProvider == null) {
+            return;
+        }
+
+        // bind to service
+        mOpenPgpServiceConnection = new OpenPgpServiceConnection(mFragment.getActivity(),
+                mOpenPgpProvider);
+        mOpenPgpServiceConnection.bindToService();
+
+        if ((message == null) && (decryptedData == null)) {
+            this.setVisibility(View.GONE);
+
+            // don't process further
+            return;
+        }
+        if (decryptedData != null && signatureResult == null) {
+            // encrypted-only
+
+            MessageOpenPgpView.this.setBackgroundColor(mFragment.getResources().getColor(
+                    R.color.openpgp_blue));
+            mText.setText(R.string.openpgp_successful_decryption);
+
+            // don't process further
+            return;
+        } else if (decryptedData != null && signatureResult != null) {
+            // signed-only and signed-and-encrypted
+
+            switch (signatureResult.getStatus()) {
+                case OpenPgpSignatureResult.SIGNATURE_ERROR:
+                    // TODO: signature error but decryption works?
+                    mText.setText(R.string.openpgp_signature_invalid);
+                    MessageOpenPgpView.this.setBackgroundColor(mFragment.getResources().getColor(
+                            R.color.openpgp_red));
+
+                    mSignatureStatusImage.setImageResource(R.drawable.overlay_error);
+                    mSignatureLayout.setVisibility(View.GONE);
+                    break;
+
+                case OpenPgpSignatureResult.SIGNATURE_SUCCESS_CERTIFIED:
+                    if (signatureResult.isSignatureOnly()) {
+                        mText.setText(R.string.openpgp_signature_valid_certified);
+                    }
+                    else {
+                        mText.setText(R.string.openpgp_successful_decryption_valid_signature_certified);
+                    }
+                    MessageOpenPgpView.this.setBackgroundColor(mFragment.getResources().getColor(
+                            R.color.openpgp_green));
+
+                    mSignatureUserId.setText(signatureResult.getUserId());
+                    mSignatureStatusImage.setImageResource(R.drawable.overlay_ok);
+                    mSignatureLayout.setVisibility(View.VISIBLE);
+
+                    break;
+
+                case OpenPgpSignatureResult.SIGNATURE_UNKNOWN_PUB_KEY:
+                    if (signatureResult.isSignatureOnly()) {
+                        mText.setText(R.string.openpgp_signature_unknown_text);
+                    }
+                    else {
+                        mText.setText(R.string.openpgp_successful_decryption_unknown_signature);
+                    }
+                    mGetKeyButton.setVisibility(View.VISIBLE);
+                    MessageOpenPgpView.this.setBackgroundColor(mFragment.getResources().getColor(
+                            R.color.openpgp_orange));
+
+                    mSignatureUserId.setText(R.string.openpgp_signature_unknown);
+                    mSignatureStatusImage.setImageResource(R.drawable.overlay_error);
+                    mSignatureLayout.setVisibility(View.VISIBLE);
+
+                    break;
+
+                case OpenPgpSignatureResult.SIGNATURE_SUCCESS_UNCERTIFIED:
+                    if (signatureResult.isSignatureOnly()) {
+                        mText.setText(R.string.openpgp_signature_valid_uncertified);
+                    }
+                    else {
+                        mText.setText(R.string.openpgp_successful_decryption_valid_signature_uncertified);
+                    }
+                    MessageOpenPgpView.this.setBackgroundColor(mFragment.getResources().getColor(
+                            R.color.openpgp_orange));
+
+                    mSignatureUserId.setText(signatureResult.getUserId());
+                    mSignatureStatusImage.setImageResource(R.drawable.overlay_ok);
+                    mSignatureLayout.setVisibility(View.VISIBLE);
+
+                    break;
+
+                default:
+                    break;
+            }
+
+            // don't process further
+            return;
+        }
+
+        // Start new decryption/verification
+        CryptoHelper helper = new CryptoHelper();
+        if (helper.isEncrypted(message) || helper.isSigned(message)) {
+            // start automatic decrypt
+            decryptAndVerify(message);
+        } else {
+            try {
+                // check for PGP/MIME encryption
+                Part pgp = MimeUtility
+                        .findFirstPartByMimeType(message, "application/pgp-encrypted");
+                if (pgp != null) {
+                    Toast.makeText(mContext, R.string.pgp_mime_unsupported, Toast.LENGTH_LONG)
+                            .show();
+                }
+            } catch (MessagingException e) {
+                // nothing to do...
+            }
+        }
+    }
+
+    private void decryptAndVerify(final Message message) {
+        this.setVisibility(View.VISIBLE);
+        mProgress.setVisibility(View.VISIBLE);
+        MessageOpenPgpView.this.setBackgroundColor(mFragment.getResources().getColor(
+                R.color.openpgp_orange));
+        mText.setText(R.string.openpgp_decrypting_verifying);
+
+        // waiting in a new thread
+        Runnable r = new Runnable() {
+
+            @Override
+            public void run() {
+                try {
+                    // get data String
+                    Part part = MimeUtility.findFirstPartByMimeType(message, "text/plain");
+                    if (part == null) {
+                        part = MimeUtility.findFirstPartByMimeType(message, "text/html");
+                    }
+                    if (part != null) {
+                        mData = MimeUtility.getTextFromPart(part);
+                    }
+
+                    // wait for service to be bound
+                    while (!mOpenPgpServiceConnection.isBound()) {
+                        try {
+                            Thread.sleep(100);
+                        } catch (InterruptedException e) {
+                        }
+                    }
+
+                    mOpenPgpApi = new OpenPgpApi(getContext(),
+                            mOpenPgpServiceConnection.getService());
+
+                    decryptVerify(new Intent());
+
+                } catch (MessagingException me) {
+                    Log.e(K9.LOG_TAG, "Unable to decrypt email.", me);
+                }
+
+            }
+        };
+
+        new Thread(r).start();
+    }
+
+    private void decryptVerify(Intent intent) {
+        intent.setAction(OpenPgpApi.ACTION_DECRYPT_VERIFY);
+        intent.putExtra(OpenPgpApi.EXTRA_REQUEST_ASCII_ARMOR, true);
+        // this follows user id format of OpenPGP to allow key generation based on it
+        // includes account number to make it unique
+        String accName = mAccount.getName() + " <" + mAccount.getEmail() + ">";
+        intent.putExtra(OpenPgpApi.EXTRA_ACCOUNT_NAME, accName);
+
+        InputStream is = null;
+        try {
+            is = new ByteArrayInputStream(mData.getBytes("UTF-8"));
+        } catch (UnsupportedEncodingException e) {
+            Log.e(K9.LOG_TAG, "UnsupportedEncodingException.", e);
+        }
+        final ByteArrayOutputStream os = new ByteArrayOutputStream();
+
+        DecryptVerifyCallback callback = new DecryptVerifyCallback(os, REQUEST_CODE_DECRYPT_VERIFY);
+
+        mOpenPgpApi.executeApiAsync(intent, is, os, callback);
+    }
+
+    private void getMissingKey() {
+        try {
+            mFragment.getActivity().startIntentSenderForResult(
+                    mMissingKeyPI.getIntentSender(),
+                    REQUEST_CODE_DECRYPT_VERIFY, null, 0, 0, 0);
+        } catch (SendIntentException e) {
+            Log.e(K9.LOG_TAG, "SendIntentException", e);
+        }
+    }
+
+    /**
+     * Called on successful decrypt/verification
+     */
+    private class DecryptVerifyCallback implements OpenPgpApi.IOpenPgpCallback {
+        ByteArrayOutputStream os;
+        int requestCode;
+
+        private DecryptVerifyCallback(ByteArrayOutputStream os, int requestCode) {
+            this.os = os;
+            this.requestCode = requestCode;
+        }
+
+        @Override
+        public void onReturn(Intent result) {
+            switch (result.getIntExtra(OpenPgpApi.RESULT_CODE, OpenPgpApi.RESULT_CODE_ERROR)) {
+                case OpenPgpApi.RESULT_CODE_SUCCESS: {
+                    try {
+                        final String output = os.toString("UTF-8");
+
+                        OpenPgpSignatureResult sigResult = null;
+                        if (result.hasExtra(OpenPgpApi.RESULT_SIGNATURE)) {
+                            sigResult = result.getParcelableExtra(OpenPgpApi.RESULT_SIGNATURE);
+                        }
+
+                        if (K9.DEBUG)
+                            Log.d(K9.LOG_TAG, "result: " + os.toByteArray().length
+                                    + " str=" + output);
+
+                        // missing key -> PendingIntent to get keys
+                        mMissingKeyPI = result.getParcelableExtra(OpenPgpApi.RESULT_INTENT);
+
+                        mProgress.setVisibility(View.GONE);
+                        mFragment.setMessageWithOpenPgp(output, sigResult);
+                    } catch (UnsupportedEncodingException e) {
+                        Log.e(K9.LOG_TAG, "UnsupportedEncodingException", e);
+                    }
+                    break;
+                }
+                case OpenPgpApi.RESULT_CODE_USER_INTERACTION_REQUIRED: {
+                    PendingIntent pi = result.getParcelableExtra(OpenPgpApi.RESULT_INTENT);
+                    try {
+                        mFragment.getActivity().startIntentSenderForResult(
+                                pi.getIntentSender(),
+                                requestCode, null, 0, 0, 0);
+                    } catch (SendIntentException e) {
+                        Log.e(K9.LOG_TAG, "SendIntentException", e);
+                    }
+                    break;
+                }
+                case OpenPgpApi.RESULT_CODE_ERROR: {
+                    OpenPgpError error = result.getParcelableExtra(OpenPgpApi.RESULT_ERROR);
+                    handleError(error);
+                    break;
+                }
+            }
+        }
+    }
+
+    public boolean handleOnActivityResult(int requestCode, int resultCode, Intent data) {
+        if (K9.DEBUG)
+            Log.d(K9.LOG_TAG, "onActivityResult resultCode: " + resultCode);
+
+        // try again after user interaction
+        if (resultCode == Activity.RESULT_OK && requestCode == REQUEST_CODE_DECRYPT_VERIFY) {
+            /*
+             * The data originally given to the decryptVerify() method, is again
+             * returned here to be used when calling decryptVerify() after user
+             * interaction. The Intent now also contains results from the user
+             * interaction, for example selected key ids.
+             */
+            decryptVerify(data);
+
+            return true;
+        }
+
+        return false;
+    }
+
+    private void handleError(final OpenPgpError error) {
+        mFragment.getActivity().runOnUiThread(new Runnable() {
+
+            @Override
+            public void run() {
+                mProgress.setVisibility(View.GONE);
+
+                if (K9.DEBUG) {
+                    Log.d(K9.LOG_TAG, "OpenPGP Error ID:" + error.getErrorId());
+                    Log.d(K9.LOG_TAG, "OpenPGP Error Message:" + error.getMessage());
+                }
+
+                mText.setText(mFragment.getString(R.string.openpgp_error) + " "
+                        + error.getMessage());
+                MessageOpenPgpView.this.setBackgroundColor(mFragment.getResources().getColor(
+                        R.color.openpgp_red));
+            }
+        });
+    }
+
+    @Override
+    protected void onAttachedToWindow() {
+        super.onAttachedToWindow();
+
+        // bind to service if a OpenPGP Provider is available
+        if (mOpenPgpProvider != null) {
+            mOpenPgpServiceConnection = new OpenPgpServiceConnection(mFragment.getActivity(),
+                    mOpenPgpProvider);
+            mOpenPgpServiceConnection.bindToService();
+        }
+    }
+
+    @Override
+    protected void onDetachedFromWindow() {
+        super.onDetachedFromWindow();
+
+        if (mOpenPgpServiceConnection != null) {
+            mOpenPgpServiceConnection.unbindFromService();
+        }
+    }
+
+}

src/com/fsck/k9/view/SingleMessageView.java

@@ -87,6 +87,7 @@ public class SingleMessageView extends LinearLayout implements OnClickListener,
 
     private boolean mScreenReaderEnabled;
     private MessageCryptoView mCryptoView;
+    private MessageOpenPgpView mOpenPgpView;
     private MessageWebView mMessageContentView;
     private AccessibleWebView mAccessibleMessageContentView;
     private MessageHeader mHeaderContainer;
@@ -128,6 +129,9 @@ public class SingleMessageView extends LinearLayout implements OnClickListener,
         mCryptoView = (MessageCryptoView) findViewById(R.id.layout_decrypt);
         mCryptoView.setFragment(fragment);
         mCryptoView.setupChildViews();
+        mOpenPgpView = (MessageOpenPgpView) findViewById(R.id.layout_decrypt_openpgp);
+        mOpenPgpView.setFragment(fragment);
+        mOpenPgpView.setupChildViews();
         mShowPicturesAction = findViewById(R.id.show_pictures);
         mShowMessageAction = findViewById(R.id.show_message);
 
@@ -616,6 +620,8 @@ public class SingleMessageView extends LinearLayout implements OnClickListener,
         if (text != null) {
             loadBodyFromText(text);
             updateCryptoLayout(account.getCryptoProvider(), pgpData, message);
+            mOpenPgpView.updateLayout(account, pgpData.getDecryptedData(),
+                    pgpData.getSignatureResult(), message);
         } else {
             showStatusMessage(getContext().getString(R.string.webview_empty_message));
         }