rewrite PgpSignEncrypt data flow

- introduce high-level SignEncryptOperation for uri to uri signing/encryption
- use SignEncryptParcel for high-level operation parameters
- use PgpSignEncryptInput plus streams for low-level operation parameters
- get rid of all sign/encrypt logic in KeychainIntentService

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/util/ContactHelper.java

@@ -35,9 +35,9 @@ import android.util.Patterns;
 import org.sufficientlysecure.keychain.Constants;
 import org.sufficientlysecure.keychain.R;
 import org.sufficientlysecure.keychain.pgp.KeyRing;
+import org.sufficientlysecure.keychain.provider.KeychainContract;
 import org.sufficientlysecure.keychain.provider.KeychainContract.UserPackets;
 import org.sufficientlysecure.keychain.ui.util.KeyFormattingUtils;
-import org.sufficientlysecure.keychain.provider.KeychainContract;
 
 import java.io.InputStream;
 import java.util.ArrayList;

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/util/InputData.java

@@ -25,16 +25,28 @@ import java.io.InputStream;
 public class InputData {
     private PositionAwareInputStream mInputStream;
     private long mSize;
+    String mOriginalFilename;
+
+    public InputData(InputStream inputStream, long size, String originalFilename) {
+        mInputStream = new PositionAwareInputStream(inputStream);
+        mSize = size;
+        mOriginalFilename = originalFilename;
+    }
 
     public InputData(InputStream inputStream, long size) {
         mInputStream = new PositionAwareInputStream(inputStream);
         mSize = size;
+        mOriginalFilename = "";
     }
 
     public InputStream getInputStream() {
         return mInputStream;
     }
 
+    public String getOriginalFilename () {
+        return mOriginalFilename;
+    }
+
     public long getSize() {
         return mSize;
     }

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/util/TlsHelper.java

@@ -20,7 +20,6 @@ package org.sufficientlysecure.keychain.util;
 import android.content.res.AssetManager;
 
 import org.sufficientlysecure.keychain.Constants;
-import org.sufficientlysecure.keychain.util.Log;
 
 import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;