diff --git a/cmds/keystore/keymgmt.c b/cmds/keystore/keymgmt.c
index 66edd56..9a1f845 100644
--- a/cmds/keystore/keymgmt.c
+++ b/cmds/keystore/keymgmt.c
@@ -79,14 +79,26 @@
 {
     int size, fd, ret = -1;
     unsigned char enc_blob[MAX_BLOB_LEN];
-
     char tmpfile[KEYFILE_LEN];
+
+    if ((keyfile == NULL) || (strlen(keyfile) >= (KEYFILE_LEN - 4))) {
+        LOGE("keyfile name is too long or null");
+        return -1;
+    }
     strcpy(tmpfile, keyfile);
     strcat(tmpfile, ".tmp");
 
     // prepare the blob
+    if (IV_LEN > USER_KEY_LEN) {
+        LOGE("iv length is too long.");
+        return -1;
+    }
     memcpy(blob->iv, iv, IV_LEN);
     blob->blob_size = get_blob_size(blob);
+    if (blob->blob_size > MAX_BLOB_LEN) {
+        LOGE("blob data size is too large.");
+        return -1;
+    }
     memcpy(enc_blob, blob->blob, blob->blob_size);
     AES_cbc_encrypt((unsigned char *)enc_blob, (unsigned char *)blob->blob,
                     blob->blob_size, enc_key, iv, AES_ENCRYPT);
@@ -133,8 +145,13 @@
     DATA_BLOB blob;
 
     // prepare the blob
+    if (strlen(MASTER_KEY_TAG) >= USER_KEY_LEN) return -1;
     strlcpy(blob.keyname, MASTER_KEY_TAG, USER_KEY_LEN);
     blob.value_size = USER_KEY_LEN;
+    if (USER_KEY_LEN > MAX_KEY_VALUE_LENGTH) {
+        LOGE("master_key length is too long.");
+        return -1;
+    }
     memcpy((void*)blob.value, (const void*)master_key, USER_KEY_LEN);
 
     // generate the encryption key
@@ -150,6 +167,10 @@
 
     get_decrypt_key(upasswd, &key);
     ret = load_n_decrypt(MASTER_KEY_TAG, MASTER_KEY, &key, &blob);
+    if (blob.value_size > USER_KEY_LEN) {
+        LOGE("the blob's value size is too large");
+        return -1;
+    }
     if (!ret) memcpy(master_key, blob.value, blob.value_size);
     return ret;
 }
@@ -207,6 +228,11 @@
     char keyfile[KEYFILE_LEN];
 
     if (state != UNLOCKED) return -state;
+    if ((strlen(namespace) >= MAX_KEY_NAME_LENGTH) ||
+        (strlen(keyname) >= MAX_KEY_NAME_LENGTH)) {
+        LOGE("keyname is too long.");
+        return -1;
+    }
     sprintf(keyfile, KEYFILE_NAME, namespace, keyname);
     return unlink(keyfile);
 }
@@ -222,10 +248,18 @@
         LOGE("Can not store key with current state %d\n", state);
         return -state;
     }
+    if ((strlen(namespace) >= MAX_KEY_NAME_LENGTH) ||
+        (strlen(keyname) >= MAX_KEY_NAME_LENGTH)) {
+        LOGE("keyname is too long.");
+        return -1;
+    }
     sprintf(keyfile, KEYFILE_NAME, namespace, keyname);
-    // flatten the args
     strcpy(blob.keyname, keyname);
     blob.value_size = size;
+    if (size > MAX_KEY_VALUE_LENGTH) {
+        LOGE("the data size is too large.");
+        return -1;
+    }
     memcpy(blob.value, data, size);
     return encrypt_n_save(&encryptKey, &blob, keyfile);
 }
@@ -242,10 +276,16 @@
         LOGE("Can not retrieve key value with current state %d\n", state);
         return -state;
     }
+    if ((strlen(namespace) >= MAX_KEY_NAME_LENGTH) ||
+        (strlen(keyname) >= MAX_KEY_NAME_LENGTH)) {
+        LOGE("keyname is too long.");
+        return -1;
+    }
     sprintf(keyfile, KEYFILE_NAME, namespace, keyname);
     ret = load_n_decrypt(keyname, keyfile, &decryptKey, &blob);
     if (!ret) {
         if ((blob.value_size > MAX_KEY_VALUE_LENGTH)) {
+            LOGE("blob value size is too large.");
             ret = -1;
         } else {
             *size = blob.value_size;
@@ -269,6 +309,13 @@
         LOGE("cannot open keystore dir or namespace is null\n");
         return -1;
     }
+
+    if (strlen(namespace) >= MAX_KEY_NAME_LENGTH) {
+        LOGE("namespace is too long.");
+        return -1;
+    }
+
+    reply[0] = 0;
     while ((de = readdir(d))) {
         char *prefix, *name, *keyfile = de->d_name;
         char *context = NULL;
@@ -337,6 +384,7 @@
 
 int reset_keystore()
 {
+    int ret = 0;
     DIR *d;
     struct dirent *de;
 
@@ -344,18 +392,24 @@
         LOGE("cannot open keystore dir\n");
         return -1;
     }
-    while ((de = readdir(d))) unlink(de->d_name);
+    while ((de = readdir(d))) {
+        if (unlink(de->d_name) != 0) ret = -1;
+    }
     closedir(d);
     state = UNINITIALIZED;
-    LOGI("keystore is reset.");
-    return 0;
+    if (ret == 0) {
+        LOGI("keystore is reset.");
+    } else {
+        LOGI("keystore can not be cleaned up entirely.");
+    }
+    return ret;
 }
 
 int init_keystore(const char *dir)
 {
     int fd;
 
-    if (!dir) mkdir(dir, 0770);
+    if (dir) mkdir(dir, 0770);
     if (!dir || chdir(dir)) {
         LOGE("Can not open/create the keystore directory %s\n",
              dir ? dir : "(null)");
diff --git a/cmds/keystore/tests/Android.mk b/cmds/keystore/tests/Android.mk
new file mode 100644
index 0000000..33541cc
--- /dev/null
+++ b/cmds/keystore/tests/Android.mk
@@ -0,0 +1,28 @@
+# Copyright (C) 2009 The Android Open Source Project
+#
+# 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.
+#
+# define the KEYSTORE_TESTS environment variable to build the test programs
+ifdef KEYSTORE_TESTS
+LOCAL_PATH:= $(call my-dir)
+include $(CLEAR_VARS)
+LOCAL_SRC_FILES:= netkeystore_test.c ../keymgmt.c
+LOCAL_SHARED_LIBRARIES := libcutils libssl
+LOCAL_MODULE:= netkeystore_test
+LOCAL_MODULE_TAGS := optional
+LOCAL_C_INCLUDES := external/openssl/include \
+								frameworks/base/cmds/keystore
+EXTRA_CFLAGS := -g -O0 -DGTEST_OS_LINUX -DGTEST_HAS_STD_STRING
+include $(BUILD_EXECUTABLE)
+
+endif  #KEYSTORE_TESTS
diff --git a/cmds/keystore/tests/netkeystore_test.c b/cmds/keystore/tests/netkeystore_test.c
new file mode 100644
index 0000000..e7e686b
--- /dev/null
+++ b/cmds/keystore/tests/netkeystore_test.c
@@ -0,0 +1,249 @@
+/*
+ * Copyright (C) 2009 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "common.h"
+#include "keymgmt.h"
+
+typedef int FUNC_PTR();
+typedef struct {
+    const char *name;
+    FUNC_PTR *func;
+} TESTFUNC;
+
+#define FUNC_NAME(x) { #x, test_##x }
+#define FUNC_BODY(x) int test_##x()
+
+#define TEST_PASSWD        "12345678"
+#define TEST_NPASSWD    "11111111"
+#define TEST_DIR        "/data/local/tmp/keystore"
+#define READONLY_DIR    "/proc/keystore"
+#define TEST_NAMESPACE    "test"
+#define TEST_KEYNAME    "key"
+#define TEST_KEYNAME2    "key2"
+#define TEST_KEYVALUE    "ANDROID"
+
+void setup()
+{
+    if (init_keystore(TEST_DIR) != 0) {
+        fprintf(stderr, "Can not create the test directory %s\n", TEST_DIR);
+        exit(-1);
+    }
+}
+
+void teardown()
+{
+    reset_keystore();
+    rmdir(TEST_DIR);
+}
+
+FUNC_BODY(init_keystore)
+{
+    if (init_keystore(READONLY_DIR) == 0) return -1;
+
+    return EXIT_SUCCESS;
+}
+
+FUNC_BODY(reset_keystore)
+{
+    chdir("/procx");
+    if (reset_keystore() == 0) return -1;
+    chdir(TEST_DIR);
+    return EXIT_SUCCESS;
+}
+
+FUNC_BODY(get_state)
+{
+    if (get_state() != UNINITIALIZED) return -1;
+    passwd(TEST_PASSWD);
+    if (get_state() != UNLOCKED) return -1;
+    lock();
+    if (get_state() != LOCKED) return -1;
+    reset_keystore();
+    if (get_state() != UNINITIALIZED) return -1;
+    return EXIT_SUCCESS;
+}
+
+FUNC_BODY(passwd)
+{
+    char buf[512];
+
+    if (passwd(" 23432dsfsdf") == 0) return -1;
+    if (passwd("dsfsdf") == 0) return -1;
+    passwd(TEST_PASSWD);
+    lock();
+    if (unlock("55555555") == 0) return -1;
+    if (unlock(TEST_PASSWD) != 0) return -1;
+
+    // change the password
+    sprintf(buf, "%s %s", "klfdjdsklfjg", "abcdefghi");
+    if (passwd(buf) == 0) return -1;
+
+    sprintf(buf, "%s %s", TEST_PASSWD, TEST_NPASSWD);
+    if (passwd(buf) != 0) return -1;
+    lock();
+
+    if (unlock(TEST_PASSWD) == 0) return -1;
+    if (unlock(TEST_NPASSWD) != 0) return -1;
+
+    return EXIT_SUCCESS;
+}
+
+FUNC_BODY(lock)
+{
+    if (lock() == 0) return -1;
+    passwd(TEST_PASSWD);
+    if (lock() != 0) return -1;
+    if (lock() != 0) return -1;
+    return EXIT_SUCCESS;
+}
+
+FUNC_BODY(unlock)
+{
+    int i = MAX_RETRY_COUNT;
+    passwd(TEST_PASSWD);
+    lock();
+    while (i > 1) {
+        if (unlock(TEST_NPASSWD) != --i) return -1;
+    }
+    if (unlock(TEST_NPASSWD) != -1) return -1;
+    return EXIT_SUCCESS;
+}
+
+FUNC_BODY(put_key)
+{
+    int i = 0;
+    char keyname[512];
+
+    if (put_key(TEST_NAMESPACE, TEST_KEYNAME, (unsigned char *)TEST_KEYVALUE,
+                strlen(TEST_KEYVALUE)) == 0) return -1;
+    passwd(TEST_PASSWD);
+    if (put_key(TEST_NAMESPACE, TEST_KEYNAME, (unsigned char *)TEST_KEYVALUE,
+                strlen(TEST_KEYVALUE)) != 0) return -1;
+
+    for(i = 0; i < 500; i++) keyname[i] = 'K';
+    keyname[i] = 0;
+    if (put_key(TEST_NAMESPACE, keyname, (unsigned char *)TEST_KEYVALUE,
+                strlen(TEST_KEYVALUE)) == 0) return -1;
+    if (put_key(TEST_NAMESPACE, TEST_KEYNAME, (unsigned char *)TEST_KEYVALUE,
+                MAX_KEY_VALUE_LENGTH + 1) == 0) return -1;
+    return EXIT_SUCCESS;
+}
+
+FUNC_BODY(get_key)
+{
+    int size;
+    unsigned char data[MAX_KEY_VALUE_LENGTH];
+
+    if (get_key(TEST_NAMESPACE, TEST_KEYNAME, data, &size) == 0) return -1;
+
+    passwd(TEST_PASSWD);
+    put_key(TEST_NAMESPACE, TEST_KEYNAME, (unsigned char *)TEST_KEYVALUE,
+            strlen(TEST_KEYVALUE));
+    if (get_key(TEST_NAMESPACE, TEST_KEYNAME, data, &size) != 0) return -1;
+    if (memcmp(data, TEST_KEYVALUE, size) != 0) return -1;
+
+    return EXIT_SUCCESS;
+}
+
+FUNC_BODY(remove_key)
+{
+    if (remove_key(TEST_NAMESPACE, TEST_KEYNAME) == 0) return -1;
+
+    passwd(TEST_PASSWD);
+    if (remove_key(TEST_NAMESPACE, TEST_KEYNAME) == 0) return -1;
+
+    put_key(TEST_NAMESPACE, TEST_KEYNAME, (unsigned char *)TEST_KEYVALUE,
+            strlen(TEST_KEYVALUE));
+    if (remove_key(TEST_NAMESPACE, TEST_KEYNAME) != 0) return -1;
+
+    return EXIT_SUCCESS;
+}
+
+FUNC_BODY(list_keys)
+{
+    int i;
+    char buf[128];
+    char reply[BUFFER_MAX];
+
+    for(i = 0; i < 100; i++) buf[i] = 'K';
+    buf[i] = 0;
+
+    if (list_keys(TEST_NAMESPACE, reply) == 0) return -1;
+
+    passwd(TEST_PASSWD);
+    if (list_keys(buf, reply) == 0) return -1;
+
+    if (list_keys(TEST_NAMESPACE, reply) != 0) return -1;
+    if (strcmp(reply, "") != 0) return -1;
+
+    put_key(TEST_NAMESPACE, TEST_KEYNAME, (unsigned char *)TEST_KEYVALUE,
+            strlen(TEST_KEYVALUE));
+    if (list_keys(TEST_NAMESPACE, reply) != 0) return -1;
+    if (strcmp(reply, TEST_KEYNAME) != 0) return -1;
+
+    put_key(TEST_NAMESPACE, TEST_KEYNAME2, (unsigned char *)TEST_KEYVALUE,
+            strlen(TEST_KEYVALUE));
+
+    if (list_keys(TEST_NAMESPACE, reply) != 0) return -1;
+    sprintf(buf, "%s %s", TEST_KEYNAME2, TEST_KEYNAME);
+    if (strcmp(reply, buf) != 0) return -1;
+
+    return EXIT_SUCCESS;
+}
+
+TESTFUNC all_tests[] = {
+    FUNC_NAME(init_keystore),
+    FUNC_NAME(reset_keystore),
+    FUNC_NAME(get_state),
+    FUNC_NAME(passwd),
+    FUNC_NAME(lock),
+    FUNC_NAME(unlock),
+    FUNC_NAME(put_key),
+    FUNC_NAME(get_key),
+    FUNC_NAME(remove_key),
+    FUNC_NAME(list_keys),
+};
+
+int main(int argc, char **argv) {
+    int i, ret;
+    for (i = 0 ; i < (int)(sizeof(all_tests)/sizeof(TESTFUNC)) ; ++i) {
+        setup();
+        if ((ret = all_tests[i].func()) != EXIT_SUCCESS) {
+            fprintf(stderr, "ERROR in function %s\n", all_tests[i].name);
+            return ret;
+        } else {
+            fprintf(stderr, "function %s PASSED!\n", all_tests[i].name);
+        }
+        teardown();
+    }
+    return EXIT_SUCCESS;
+}
diff --git a/include/utils/ResourceTypes.h b/include/utils/ResourceTypes.h
index edd0cae..e524e2a 100644
--- a/include/utils/ResourceTypes.h
+++ b/include/utils/ResourceTypes.h
@@ -1655,7 +1655,8 @@
     ssize_t resolveReference(Res_value* inOutValue,
                              ssize_t blockIndex,
                              uint32_t* outLastRef = NULL,
-                             uint32_t* inoutTypeSpecFlags = NULL) const;
+                             uint32_t* inoutTypeSpecFlags = NULL,
+                             ResTable_config* outConfig = NULL) const;
 
     enum {
         TMP_BUFFER_SIZE = 16
@@ -1729,7 +1730,8 @@
          */
         ssize_t resolveAttributeReference(Res_value* inOutValue,
                 ssize_t blockIndex, uint32_t* outLastRef = NULL,
-                uint32_t* inoutTypeSpecFlags = NULL) const;
+                uint32_t* inoutTypeSpecFlags = NULL,
+                ResTable_config* inoutConfig = NULL) const;
 
         void dumpToLog() const;
         
diff --git a/libs/surfaceflinger/DisplayHardware/DisplayHardware.cpp b/libs/surfaceflinger/DisplayHardware/DisplayHardware.cpp
index eec645e..ab02fa0 100644
--- a/libs/surfaceflinger/DisplayHardware/DisplayHardware.cpp
+++ b/libs/surfaceflinger/DisplayHardware/DisplayHardware.cpp
@@ -197,6 +197,9 @@
             LOGW("ro.sf.lcd_density not defined, using 160 dpi by default.");
             strcpy(property, "160");
         }
+    } else {
+        /* for the emulator case, reset the dpi values too */
+        mDpiX = mDpiY = atoi(property);
     }
     mDensity = atoi(property) * (1.0f/160.0f);
 
diff --git a/libs/surfaceflinger/SurfaceFlinger.cpp b/libs/surfaceflinger/SurfaceFlinger.cpp
index bbaeedc..7a277fe 100644
--- a/libs/surfaceflinger/SurfaceFlinger.cpp
+++ b/libs/surfaceflinger/SurfaceFlinger.cpp
@@ -692,9 +692,14 @@
 
         // some layers might have been removed, so
         // we need to update the regions they're exposing.
-        size_t c = mRemovedLayers.size();
+        const SortedVector<LayerBase*>& removedLayers(mRemovedLayers);
+        size_t c = removedLayers.size();
         if (c) {
             mVisibleRegionsDirty = true;
+            while (c--) {
+                mDirtyRegionRemovedLayer.orSelf(
+                        removedLayers[c]->visibleRegionScreen);
+            }
         }
 
         const LayerVector& currentLayers = mCurrentState.layersSortedByZ;
@@ -734,17 +739,15 @@
         layer->validateVisibility(planeTransform);
 
         // start with the whole surface at its current location
-        const Layer::State& s = layer->drawingState();
-        const Rect bounds(layer->visibleBounds());
+        const Layer::State& s(layer->drawingState());
 
         // handle hidden surfaces by setting the visible region to empty
         Region opaqueRegion;
         Region visibleRegion;
         Region coveredRegion;
-        if (UNLIKELY((s.flags & ISurfaceComposer::eLayerHidden) || !s.alpha)) {
-            visibleRegion.clear();
-        } else {
+        if (LIKELY(!(s.flags & ISurfaceComposer::eLayerHidden) && s.alpha)) {
             const bool translucent = layer->needsBlending();
+            const Rect bounds(layer->visibleBounds());
             visibleRegion.set(bounds);
             coveredRegion = visibleRegion;
 
@@ -791,12 +794,16 @@
         layer->setVisibleRegion(visibleRegion);
         layer->setCoveredRegion(coveredRegion);
 
-        // If a secure layer is partially visible, lockdown the screen!
+        // If a secure layer is partially visible, lock-down the screen!
         if (layer->isSecure() && !visibleRegion.isEmpty()) {
             secureFrameBuffer = true;
         }
     }
 
+    // invalidate the areas where a layer was removed
+    dirtyRegion.orSelf(mDirtyRegionRemovedLayer);
+    mDirtyRegionRemovedLayer.clear();
+
     mSecureFrameBuffer = secureFrameBuffer;
     opaqueRegion = aboveOpaqueLayers;
 }
diff --git a/libs/surfaceflinger/SurfaceFlinger.h b/libs/surfaceflinger/SurfaceFlinger.h
index 15913f2..0d63e1d 100644
--- a/libs/surfaceflinger/SurfaceFlinger.h
+++ b/libs/surfaceflinger/SurfaceFlinger.h
@@ -351,6 +351,7 @@
                 // Can only accessed from the main thread, these members
                 // don't need synchronization
                 Region                      mDirtyRegion;
+                Region                      mDirtyRegionRemovedLayer;
                 Region                      mInvalidRegion;
                 Region                      mWormholeRegion;
                 Client*                     mLastScheduledBroadcast;
diff --git a/libs/utils/ResourceTypes.cpp b/libs/utils/ResourceTypes.cpp
index 4dca8bd..0831f4a 100644
--- a/libs/utils/ResourceTypes.cpp
+++ b/libs/utils/ResourceTypes.cpp
@@ -1486,7 +1486,7 @@
 
 ssize_t ResTable::Theme::resolveAttributeReference(Res_value* inOutValue,
         ssize_t blockIndex, uint32_t* outLastRef,
-        uint32_t* inoutTypeSpecFlags) const
+        uint32_t* inoutTypeSpecFlags, ResTable_config* inoutConfig) const
 {
     //printf("Resolving type=0x%x\n", inOutValue->dataType);
     if (inOutValue->dataType == Res_value::TYPE_ATTRIBUTE) {
@@ -1498,7 +1498,8 @@
             return blockIndex;
         }
     }
-    return mTable.resolveReference(inOutValue, blockIndex, outLastRef);
+    return mTable.resolveReference(inOutValue, blockIndex, outLastRef,
+            inoutTypeSpecFlags, inoutConfig);
 }
 
 void ResTable::Theme::dumpToLog() const
@@ -1891,7 +1892,8 @@
 }
 
 ssize_t ResTable::resolveReference(Res_value* value, ssize_t blockIndex,
-        uint32_t* outLastRef, uint32_t* inoutTypeSpecFlags) const
+        uint32_t* outLastRef, uint32_t* inoutTypeSpecFlags,
+        ResTable_config* outConfig) const
 {
     int count=0;
     while (blockIndex >= 0 && value->dataType == value->TYPE_REFERENCE
@@ -1899,7 +1901,8 @@
         if (outLastRef) *outLastRef = value->data;
         uint32_t lastRef = value->data;
         uint32_t newFlags = 0;
-        const ssize_t newIndex = getResource(value->data, value, true, &newFlags);
+        const ssize_t newIndex = getResource(value->data, value, true, &newFlags,
+                outConfig);
         //LOGI("Resolving reference d=%p: newIndex=%d, t=0x%02x, d=%p\n",
         //     (void*)lastRef, (int)newIndex, (int)value->dataType, (void*)value->data);
         //printf("Getting reference 0x%08x: newIndex=%d\n", value->data, newIndex);
diff --git a/vpn/java/android/net/vpn/PptpProfile.java b/vpn/java/android/net/vpn/PptpProfile.java
index c68bb71..b4b7be5 100644
--- a/vpn/java/android/net/vpn/PptpProfile.java
+++ b/vpn/java/android/net/vpn/PptpProfile.java
@@ -16,15 +16,41 @@
 
 package android.net.vpn;
 
+import android.os.Parcel;
+
 /**
  * The profile for PPTP type of VPN.
  * {@hide}
  */
 public class PptpProfile extends VpnProfile {
     private static final long serialVersionUID = 1L;
+    private boolean mEncryption = true;
 
     @Override
     public VpnType getType() {
         return VpnType.PPTP;
     }
+
+    /**
+     * Enables/disables the encryption for PPTP tunnel.
+     */
+    public void setEncryptionEnabled(boolean enabled) {
+        mEncryption = enabled;
+    }
+
+    public boolean isEncryptionEnabled() {
+        return mEncryption;
+    }
+
+    @Override
+    protected void readFromParcel(Parcel in) {
+        super.readFromParcel(in);
+        mEncryption = in.readInt() > 0;
+    }
+
+    @Override
+    public void writeToParcel(Parcel parcel, int flags) {
+        super.writeToParcel(parcel, flags);
+        parcel.writeInt(mEncryption ? 1 : 0);
+    }
 }
diff --git a/vpn/java/android/net/vpn/VpnManager.java b/vpn/java/android/net/vpn/VpnManager.java
index 0bf2346..e448e5a 100644
--- a/vpn/java/android/net/vpn/VpnManager.java
+++ b/vpn/java/android/net/vpn/VpnManager.java
@@ -50,6 +50,10 @@
     public static final int VPN_ERROR_CONNECTION_FAILED = 2;
     /** Error code to indicate the server is not known. */
     public static final int VPN_ERROR_UNKNOWN_SERVER = 3;
+    /** Error code to indicate an error from challenge response. */
+    public static final int VPN_ERROR_CHALLENGE = 4;
+    /** Error code to indicate an error of remote server hanging up. */
+    public static final int VPN_ERROR_REMOTE_HUNG_UP = 5;
     private static final int VPN_ERROR_NO_ERROR = 0;
 
     public static final String PROFILES_PATH = "/data/misc/vpn/profiles";