WifiConfigStore: Encrypt credentials for networks (2/4)

Plumb the EncryptionUtil & version info to the XmlUtil classes that
actually handle the serialization/deserialization of data.

Also, created a helper class to serialize/deserialize EncryptedData
class.

Bug: 140485110
Test: atest com.android.server.wifi
Change-Id: I92846f1fb63f3b85892750b195a535bcfdc03e2c
Merged-In: I92846f1fb63f3b85892750b195a535bcfdc03e2c

4 files changed, 156 insertions, 46 deletions

diff --git a/service/java/com/android/server/wifi/NetworkListStoreData.java b/service/java/com/android/server/wifi/NetworkListStoreData.java
index 981e97c7e..4f2f36b9b 100644
--- a/service/java/com/android/server/wifi/NetworkListStoreData.java
+++ b/service/java/com/android/server/wifi/NetworkListStoreData.java
@@ -16,6 +16,8 @@
 
 package com.android.server.wifi;
 
+import static com.android.server.wifi.WifiConfigStore.ENCRYPT_CREDENTIALS_CONFIG_STORE_DATA_VERSION;
+
 import android.annotation.NonNull;
 import android.content.Context;
 import android.net.IpConfiguration;
@@ -71,7 +73,7 @@ public abstract class NetworkListStoreData implements WifiConfigStore.StoreData
     public void serializeData(XmlSerializer out,
             @NonNull WifiConfigStoreEncryptionUtil encryptionUtil)
             throws XmlPullParserException, IOException {
-        serializeNetworkList(out, mConfigurations);
+        serializeNetworkList(out, mConfigurations, encryptionUtil);
     }
 
     @Override
@@ -83,7 +85,7 @@ public abstract class NetworkListStoreData implements WifiConfigStore.StoreData
         if (in == null) {
             return;
         }
-        mConfigurations = parseNetworkList(in, outerTagDepth);
+        mConfigurations = parseNetworkList(in, outerTagDepth, version, encryptionUtil);
     }
 
     @Override
@@ -123,33 +125,38 @@ public abstract class NetworkListStoreData implements WifiConfigStore.StoreData
      *
      * @param out The output stream to serialize the data to
      * @param networkList The network list to serialize
+     * @param encryptionUtil Instance of {@link WifiConfigStoreEncryptionUtil}
      * @throws XmlPullParserException
      * @throws IOException
      */
-    private void serializeNetworkList(XmlSerializer out, List<WifiConfiguration> networkList)
+    private void serializeNetworkList(XmlSerializer out, List<WifiConfiguration> networkList,
+            @NonNull WifiConfigStoreEncryptionUtil encryptionUtil)
             throws XmlPullParserException, IOException {
         if (networkList == null) {
             return;
         }
         for (WifiConfiguration network : networkList) {
-            serializeNetwork(out, network);
+            serializeNetwork(out, network, encryptionUtil);
         }
     }
 
     /**
      * Serialize a {@link WifiConfiguration} to an output stream in XML format.
-     * @param out
-     * @param config
+     *
+     * @param out The output stream to serialize the data to
+     * @param config The network config to serialize
+     * @param encryptionUtil Instance of {@link WifiConfigStoreEncryptionUtil}
      * @throws XmlPullParserException
      * @throws IOException
      */
-    private void serializeNetwork(XmlSerializer out, WifiConfiguration config)
+    private void serializeNetwork(XmlSerializer out, WifiConfiguration config,
+            @NonNull WifiConfigStoreEncryptionUtil encryptionUtil)
             throws XmlPullParserException, IOException {
         XmlUtil.writeNextSectionStart(out, XML_TAG_SECTION_HEADER_NETWORK);
 
         // Serialize WifiConfiguration.
         XmlUtil.writeNextSectionStart(out, XML_TAG_SECTION_HEADER_WIFI_CONFIGURATION);
-        WifiConfigurationXmlUtil.writeToXmlForConfigStore(out, config);
+        WifiConfigurationXmlUtil.writeToXmlForConfigStore(out, config, encryptionUtil);
         XmlUtil.writeNextSectionEnd(out, XML_TAG_SECTION_HEADER_WIFI_CONFIGURATION);
 
         // Serialize network selection status.
@@ -167,7 +174,7 @@ public abstract class NetworkListStoreData implements WifiConfigStore.StoreData
                 && config.enterpriseConfig.getEapMethod() != WifiEnterpriseConfig.Eap.NONE) {
             XmlUtil.writeNextSectionStart(
                     out, XML_TAG_SECTION_HEADER_WIFI_ENTERPRISE_CONFIGURATION);
-            WifiEnterpriseConfigXmlUtil.writeToXml(out, config.enterpriseConfig);
+            WifiEnterpriseConfigXmlUtil.writeToXml(out, config.enterpriseConfig, encryptionUtil);
             XmlUtil.writeNextSectionEnd(out, XML_TAG_SECTION_HEADER_WIFI_ENTERPRISE_CONFIGURATION);
         }
 
@@ -179,11 +186,15 @@ public abstract class NetworkListStoreData implements WifiConfigStore.StoreData
      *
      * @param in The input stream to read from
      * @param outerTagDepth The XML tag depth of the outer XML block
+     * @param version Version of config store file.
+     * @param encryptionUtil Instance of {@link WifiConfigStoreEncryptionUtil}
      * @return List of {@link WifiConfiguration}
      * @throws XmlPullParserException
      * @throws IOException
      */
-    private List<WifiConfiguration> parseNetworkList(XmlPullParser in, int outerTagDepth)
+    private List<WifiConfiguration> parseNetworkList(XmlPullParser in, int outerTagDepth,
+            @WifiConfigStore.Version int version,
+            @NonNull WifiConfigStoreEncryptionUtil encryptionUtil)
             throws XmlPullParserException, IOException {
         List<WifiConfiguration> networkList = new ArrayList<>();
         while (XmlUtil.gotoNextSectionWithNameOrEnd(in, XML_TAG_SECTION_HEADER_NETWORK,
@@ -191,7 +202,8 @@ public abstract class NetworkListStoreData implements WifiConfigStore.StoreData
             // Try/catch only runtime exceptions (like illegal args), any XML/IO exceptions are
             // fatal and should abort the entire loading process.
             try {
-                WifiConfiguration config = parseNetwork(in, outerTagDepth + 1);
+                WifiConfiguration config =
+                        parseNetwork(in, outerTagDepth + 1, version, encryptionUtil);
                 networkList.add(config);
             } catch (RuntimeException e) {
                 // Failed to parse this network, skip it.
@@ -206,11 +218,15 @@ public abstract class NetworkListStoreData implements WifiConfigStore.StoreData
      *
      * @param in The input stream to read from
      * @param outerTagDepth The XML tag depth of the outer XML block
+     * @param version Version of config store file.
+     * @param encryptionUtil Instance of {@link WifiConfigStoreEncryptionUtil}
      * @return {@link WifiConfiguration}
      * @throws XmlPullParserException
      * @throws IOException
      */
-    private WifiConfiguration parseNetwork(XmlPullParser in, int outerTagDepth)
+    private WifiConfiguration parseNetwork(XmlPullParser in, int outerTagDepth,
+            @WifiConfigStore.Version int version,
+            @NonNull WifiConfigStoreEncryptionUtil encryptionUtil)
             throws XmlPullParserException, IOException {
         Pair<String, WifiConfiguration> parsedConfig = null;
         NetworkSelectionStatus status = null;
@@ -225,7 +241,9 @@ public abstract class NetworkListStoreData implements WifiConfigStore.StoreData
                         throw new XmlPullParserException("Detected duplicate tag for: "
                                 + XML_TAG_SECTION_HEADER_WIFI_CONFIGURATION);
                     }
-                    parsedConfig = WifiConfigurationXmlUtil.parseFromXml(in, outerTagDepth + 1);
+                    parsedConfig = WifiConfigurationXmlUtil.parseFromXml(in, outerTagDepth + 1,
+                            version >= ENCRYPT_CREDENTIALS_CONFIG_STORE_DATA_VERSION,
+                            encryptionUtil);
                     break;
                 case XML_TAG_SECTION_HEADER_NETWORK_STATUS:
                     if (status != null) {
@@ -247,7 +265,9 @@ public abstract class NetworkListStoreData implements WifiConfigStore.StoreData
                                 + XML_TAG_SECTION_HEADER_WIFI_ENTERPRISE_CONFIGURATION);
                     }
                     enterpriseConfig =
-                            WifiEnterpriseConfigXmlUtil.parseFromXml(in, outerTagDepth + 1);
+                            WifiEnterpriseConfigXmlUtil.parseFromXml(in, outerTagDepth + 1,
+                            version >= ENCRYPT_CREDENTIALS_CONFIG_STORE_DATA_VERSION,
+                            encryptionUtil);
                     break;
                 default:
                     throw new XmlPullParserException("Unknown tag under "
diff --git a/service/java/com/android/server/wifi/NetworkSuggestionStoreData.java b/service/java/com/android/server/wifi/NetworkSuggestionStoreData.java
index e9503b7e4..fc0c55b5a 100644
--- a/service/java/com/android/server/wifi/NetworkSuggestionStoreData.java
+++ b/service/java/com/android/server/wifi/NetworkSuggestionStoreData.java
@@ -16,6 +16,8 @@
 
 package com.android.server.wifi;
 
+import static com.android.server.wifi.WifiConfigStore.ENCRYPT_CREDENTIALS_CONFIG_STORE_DATA_VERSION;
+
 import android.annotation.NonNull;
 import android.net.wifi.WifiConfiguration;
 import android.net.wifi.WifiEnterpriseConfig;
@@ -103,7 +105,7 @@ public class NetworkSuggestionStoreData implements WifiConfigStore.StoreData {
     public void serializeData(XmlSerializer out,
             @NonNull WifiConfigStoreEncryptionUtil encryptionUtil)
             throws XmlPullParserException, IOException {
-        serializeNetworkSuggestionsMap(out, mDataSource.toSerialize());
+        serializeNetworkSuggestionsMap(out, mDataSource.toSerialize(), encryptionUtil);
     }
 
     @Override
@@ -115,7 +117,8 @@ public class NetworkSuggestionStoreData implements WifiConfigStore.StoreData {
         if (in == null) {
             return;
         }
-        mDataSource.fromDeserialized(parseNetworkSuggestionsMap(in, outerTagDepth));
+        mDataSource.fromDeserialized(
+                parseNetworkSuggestionsMap(in, outerTagDepth, version, encryptionUtil));
     }
 
     @Override
@@ -145,7 +148,8 @@ public class NetworkSuggestionStoreData implements WifiConfigStore.StoreData {
      * @throws IOException
      */
     private void serializeNetworkSuggestionsMap(
-            XmlSerializer out, final Map<String, PerAppInfo> networkSuggestionsMap)
+            XmlSerializer out, final Map<String, PerAppInfo> networkSuggestionsMap,
+            @NonNull WifiConfigStoreEncryptionUtil encryptionUtil)
             throws XmlPullParserException, IOException {
         if (networkSuggestionsMap == null) {
             return;
@@ -160,7 +164,7 @@ public class NetworkSuggestionStoreData implements WifiConfigStore.StoreData {
             XmlUtil.writeNextValue(out, XML_TAG_SUGGESTOR_PACKAGE_NAME, packageName);
             XmlUtil.writeNextValue(out, XML_TAG_SUGGESTOR_HAS_USER_APPROVED, hasUserApproved);
             XmlUtil.writeNextValue(out, XML_TAG_SUGGESTOR_MAX_SIZE, maxSize);
-            serializeExtNetworkSuggestions(out, networkSuggestions);
+            serializeExtNetworkSuggestions(out, networkSuggestions, encryptionUtil);
             XmlUtil.writeNextSectionEnd(out, XML_TAG_SECTION_HEADER_NETWORK_SUGGESTION_PER_APP);
         }
     }
@@ -172,10 +176,11 @@ public class NetworkSuggestionStoreData implements WifiConfigStore.StoreData {
      * @throws IOException
      */
     private void serializeExtNetworkSuggestions(
-            XmlSerializer out, final Set<ExtendedWifiNetworkSuggestion> extNetworkSuggestions)
+            XmlSerializer out, final Set<ExtendedWifiNetworkSuggestion> extNetworkSuggestions,
+            @NonNull WifiConfigStoreEncryptionUtil encryptionUtil)
             throws XmlPullParserException, IOException {
         for (ExtendedWifiNetworkSuggestion extNetworkSuggestion : extNetworkSuggestions) {
-            serializeNetworkSuggestion(out, extNetworkSuggestion.wns);
+            serializeNetworkSuggestion(out, extNetworkSuggestion.wns, encryptionUtil);
         }
     }
 
@@ -186,13 +191,15 @@ public class NetworkSuggestionStoreData implements WifiConfigStore.StoreData {
      * @throws IOException
      */
     private void serializeNetworkSuggestion(XmlSerializer out,
-                                            final WifiNetworkSuggestion suggestion)
+            final WifiNetworkSuggestion suggestion,
+            @NonNull WifiConfigStoreEncryptionUtil encryptionUtil)
             throws XmlPullParserException, IOException {
         XmlUtil.writeNextSectionStart(out, XML_TAG_SECTION_HEADER_NETWORK_SUGGESTION);
 
         // Serialize WifiConfiguration.
         XmlUtil.writeNextSectionStart(out, XML_TAG_SECTION_HEADER_WIFI_CONFIGURATION);
-        WifiConfigurationXmlUtil.writeToXmlForConfigStore(out, suggestion.wifiConfiguration);
+        WifiConfigurationXmlUtil.writeToXmlForConfigStore(
+                out, suggestion.wifiConfiguration, encryptionUtil);
         XmlUtil.writeNextSectionEnd(out, XML_TAG_SECTION_HEADER_WIFI_CONFIGURATION);
         // Serialize enterprise configuration for enterprise networks.
         if (suggestion.wifiConfiguration.enterpriseConfig != null
@@ -201,7 +208,7 @@ public class NetworkSuggestionStoreData implements WifiConfigStore.StoreData {
             XmlUtil.writeNextSectionStart(
                     out, XML_TAG_SECTION_HEADER_WIFI_ENTERPRISE_CONFIGURATION);
             XmlUtil.WifiEnterpriseConfigXmlUtil.writeToXml(
-                    out, suggestion.wifiConfiguration.enterpriseConfig);
+                    out, suggestion.wifiConfiguration.enterpriseConfig, encryptionUtil);
             XmlUtil.writeNextSectionEnd(out, XML_TAG_SECTION_HEADER_WIFI_ENTERPRISE_CONFIGURATION);
         }
 
@@ -223,7 +230,9 @@ public class NetworkSuggestionStoreData implements WifiConfigStore.StoreData {
      * @throws XmlPullParserException
      * @throws IOException
      */
-    private Map<String, PerAppInfo> parseNetworkSuggestionsMap(XmlPullParser in, int outerTagDepth)
+    private Map<String, PerAppInfo> parseNetworkSuggestionsMap(XmlPullParser in, int outerTagDepth,
+            @WifiConfigStore.Version int version,
+            @NonNull WifiConfigStoreEncryptionUtil encryptionUtil)
             throws XmlPullParserException, IOException {
         Map<String, PerAppInfo> networkSuggestionsMap = new HashMap<>();
         while (XmlUtil.gotoNextSectionWithNameOrEnd(
@@ -238,7 +247,8 @@ public class NetworkSuggestionStoreData implements WifiConfigStore.StoreData {
                 int maxSize = (int) XmlUtil.readNextValueWithName(in, XML_TAG_SUGGESTOR_MAX_SIZE);
                 PerAppInfo perAppInfo = new PerAppInfo(packageName);
                 Set<ExtendedWifiNetworkSuggestion> extNetworkSuggestions =
-                        parseExtNetworkSuggestions(in, outerTagDepth + 1, perAppInfo);
+                        parseExtNetworkSuggestions(
+                                in, outerTagDepth + 1, version, encryptionUtil, perAppInfo);
                 perAppInfo.hasUserApproved = hasUserApproved;
                 perAppInfo.maxSize = maxSize;
                 perAppInfo.extNetworkSuggestions.addAll(extNetworkSuggestions);
@@ -258,7 +268,8 @@ public class NetworkSuggestionStoreData implements WifiConfigStore.StoreData {
      * @throws IOException
      */
     private Set<ExtendedWifiNetworkSuggestion> parseExtNetworkSuggestions(
-            XmlPullParser in, int outerTagDepth, PerAppInfo perAppInfo)
+            XmlPullParser in, int outerTagDepth, @WifiConfigStore.Version int version,
+            @NonNull WifiConfigStoreEncryptionUtil encryptionUtil, PerAppInfo perAppInfo)
             throws XmlPullParserException, IOException {
         Set<ExtendedWifiNetworkSuggestion> extNetworkSuggestions = new HashSet<>();
         while (XmlUtil.gotoNextSectionWithNameOrEnd(
@@ -267,7 +278,7 @@ public class NetworkSuggestionStoreData implements WifiConfigStore.StoreData {
             // fatal and should abort the entire loading process.
             try {
                 WifiNetworkSuggestion networkSuggestion =
-                        parseNetworkSuggestion(in, outerTagDepth + 1);
+                        parseNetworkSuggestion(in, outerTagDepth + 1, version, encryptionUtil);
                 extNetworkSuggestions.add(ExtendedWifiNetworkSuggestion.fromWns(
                         networkSuggestion, perAppInfo));
             } catch (RuntimeException e) {
@@ -284,7 +295,9 @@ public class NetworkSuggestionStoreData implements WifiConfigStore.StoreData {
      * @throws XmlPullParserException
      * @throws IOException
      */
-    private WifiNetworkSuggestion parseNetworkSuggestion(XmlPullParser in, int outerTagDepth)
+    private WifiNetworkSuggestion parseNetworkSuggestion(XmlPullParser in, int outerTagDepth,
+            @WifiConfigStore.Version int version,
+            @NonNull WifiConfigStoreEncryptionUtil encryptionUtil)
             throws XmlPullParserException, IOException {
         Pair<String, WifiConfiguration> parsedConfig = null;
         WifiEnterpriseConfig enterpriseConfig = null;
@@ -329,7 +342,9 @@ public class NetworkSuggestionStoreData implements WifiConfigStore.StoreData {
                                     + XML_TAG_SECTION_HEADER_WIFI_CONFIGURATION);
                         }
                         parsedConfig = WifiConfigurationXmlUtil.parseFromXml(
-                                in, outerTagDepth + 1);
+                                in, outerTagDepth + 1,
+                            version >= ENCRYPT_CREDENTIALS_CONFIG_STORE_DATA_VERSION,
+                            encryptionUtil);
                         break;
                     case XML_TAG_SECTION_HEADER_WIFI_ENTERPRISE_CONFIGURATION:
                         if (enterpriseConfig != null) {
@@ -337,7 +352,9 @@ public class NetworkSuggestionStoreData implements WifiConfigStore.StoreData {
                                     + XML_TAG_SECTION_HEADER_WIFI_ENTERPRISE_CONFIGURATION);
                         }
                         enterpriseConfig = XmlUtil.WifiEnterpriseConfigXmlUtil.parseFromXml(
-                                in, outerTagDepth + 1);
+                                in, outerTagDepth + 1,
+                            version >= ENCRYPT_CREDENTIALS_CONFIG_STORE_DATA_VERSION,
+                            encryptionUtil);
                         break;
                     default:
                         throw new XmlPullParserException("Unknown tag under "
diff --git a/service/java/com/android/server/wifi/WifiConfigStore.java b/service/java/com/android/server/wifi/WifiConfigStore.java
index efe4a4c8d..dee52a795 100644
--- a/service/java/com/android/server/wifi/WifiConfigStore.java
+++ b/service/java/com/android/server/wifi/WifiConfigStore.java
@@ -100,8 +100,6 @@ public class WifiConfigStore {
     private static final String XML_TAG_DOCUMENT_HEADER = "WifiConfigStoreData";
     private static final String XML_TAG_VERSION = "Version";
     private static final String XML_TAG_HEADER_INTEGRITY = "Integrity";
-    private static final String XML_TAG_INTEGRITY_ENCRYPTED_DATA = "EncryptedData";
-    private static final String XML_TAG_INTEGRITY_IV = "IV";
     /**
      * Current config store data version. This will be incremented for any additions.
      */
@@ -669,8 +667,7 @@ public class WifiConfigStore {
     private static void parseAndDiscardIntegrityDataFromXml(XmlPullParser in, int outerTagDepth)
             throws XmlPullParserException, IOException {
         XmlUtil.gotoNextSectionWithName(in, XML_TAG_HEADER_INTEGRITY, outerTagDepth);
-        XmlUtil.readNextValueWithName(in, XML_TAG_INTEGRITY_ENCRYPTED_DATA);
-        XmlUtil.readNextValueWithName(in, XML_TAG_INTEGRITY_IV);
+        XmlUtil.EncryptedDataXmlUtil.parseFromXml(in, outerTagDepth + 1);
     }
 
     /**
diff --git a/service/java/com/android/server/wifi/util/XmlUtil.java b/service/java/com/android/server/wifi/util/XmlUtil.java
index 188d3b5c7..292c7929a 100644
--- a/service/java/com/android/server/wifi/util/XmlUtil.java
+++ b/service/java/com/android/server/wifi/util/XmlUtil.java
@@ -16,6 +16,8 @@
 
 package com.android.server.wifi.util;
 
+import android.annotation.NonNull;
+import android.annotation.Nullable;
 import android.net.IpConfiguration;
 import android.net.IpConfiguration.IpAssignment;
 import android.net.IpConfiguration.ProxySettings;
@@ -380,11 +382,13 @@ public class XmlUtil {
          * Write the Configuration data elements that are common for backup & config store to the
          * XML stream.
          *
-         * @param out           XmlSerializer instance pointing to the XML stream.
+         * @param out XmlSerializer instance pointing to the XML stream.
          * @param configuration WifiConfiguration object to be serialized.
+         * @param encryptionUtil Instance of {@link EncryptedDataXmlUtil}.
          */
         public static void writeCommonElementsToXml(
-                XmlSerializer out, WifiConfiguration configuration)
+                XmlSerializer out, WifiConfiguration configuration,
+                @Nullable WifiConfigStoreEncryptionUtil encryptionUtil)
                 throws XmlPullParserException, IOException {
             XmlUtil.writeNextValue(out, XML_TAG_CONFIG_KEY, configuration.configKey());
             XmlUtil.writeNextValue(out, XML_TAG_SSID, configuration.SSID);
@@ -428,7 +432,7 @@ public class XmlUtil {
          */
         public static void writeToXmlForBackup(XmlSerializer out, WifiConfiguration configuration)
                 throws XmlPullParserException, IOException {
-            writeCommonElementsToXml(out, configuration);
+            writeCommonElementsToXml(out, configuration, null);
             XmlUtil.writeNextValue(out, XML_TAG_METERED_OVERRIDE, configuration.meteredOverride);
         }
 
@@ -436,13 +440,15 @@ public class XmlUtil {
          * Write the Configuration data elements for config store from the provided Configuration
          * to the XML stream.
          *
-         * @param out           XmlSerializer instance pointing to the XML stream.
+         * @param out XmlSerializer instance pointing to the XML stream.
          * @param configuration WifiConfiguration object to be serialized.
+         * @param encryptionUtil Instance of {@link EncryptedDataXmlUtil}.
          */
         public static void writeToXmlForConfigStore(
-                XmlSerializer out, WifiConfiguration configuration)
+                XmlSerializer out, WifiConfiguration configuration,
+                @NonNull WifiConfigStoreEncryptionUtil encryptionUtil)
                 throws XmlPullParserException, IOException {
-            writeCommonElementsToXml(out, configuration);
+            writeCommonElementsToXml(out, configuration, encryptionUtil);
             XmlUtil.writeNextValue(out, XML_TAG_STATUS, configuration.status);
             XmlUtil.writeNextValue(out, XML_TAG_FQDN, configuration.FQDN);
             XmlUtil.writeNextValue(
@@ -509,13 +515,16 @@ public class XmlUtil {
          * Note: This is used for parsing both backup data and config store data. Looping through
          * the tags make it easy to add or remove elements in the future versions if needed.
          *
-         * @param in            XmlPullParser instance pointing to the XML stream.
+         * @param in XmlPullParser instance pointing to the XML stream.
          * @param outerTagDepth depth of the outer tag in the XML document.
+         * @param areCredentialsEncrypted Whether credentials are encrypted or not.
+         * @param encryptionUtil Instance of {@link EncryptedDataXmlUtil}.
          * @return Pair<Config key, WifiConfiguration object> if parsing is successful,
          * null otherwise.
          */
         public static Pair<String, WifiConfiguration> parseFromXml(
-                XmlPullParser in, int outerTagDepth)
+                XmlPullParser in, int outerTagDepth, boolean areCredentialsEncrypted,
+                @NonNull WifiConfigStoreEncryptionUtil encryptionUtil)
                 throws XmlPullParserException, IOException {
             WifiConfiguration configuration = new WifiConfiguration();
             String configKeyInData = null;
@@ -1022,10 +1031,12 @@ public class XmlUtil {
          * Write the WifiEnterpriseConfig data elements from the provided config to the XML
          * stream.
          *
-         * @param out              XmlSerializer instance pointing to the XML stream.
+         * @param out XmlSerializer instance pointing to the XML stream.
          * @param enterpriseConfig WifiEnterpriseConfig object to be serialized.
+         * @param encryptionUtil Instance of {@link EncryptedDataXmlUtil}.
          */
-        public static void writeToXml(XmlSerializer out, WifiEnterpriseConfig enterpriseConfig)
+        public static void writeToXml(XmlSerializer out, WifiEnterpriseConfig enterpriseConfig,
+                @NonNull WifiConfigStoreEncryptionUtil encryptionUtil)
                 throws XmlPullParserException, IOException {
             XmlUtil.writeNextValue(out, XML_TAG_IDENTITY,
                     enterpriseConfig.getFieldValue(WifiEnterpriseConfig.IDENTITY_KEY));
@@ -1060,11 +1071,15 @@ public class XmlUtil {
         /**
          * Parses the data elements from the provided XML stream to a WifiEnterpriseConfig object.
          *
-         * @param in            XmlPullParser instance pointing to the XML stream.
+         * @param in XmlPullParser instance pointing to the XML stream.
          * @param outerTagDepth depth of the outer tag in the XML document.
+         * @param areCredentialsEncrypted Whether credentials are encrypted or not.
+         * @param encryptionUtil Instance of {@link EncryptedDataXmlUtil}.
          * @return WifiEnterpriseConfig object if parsing is successful, null otherwise.
          */
-        public static WifiEnterpriseConfig parseFromXml(XmlPullParser in, int outerTagDepth)
+        public static WifiEnterpriseConfig parseFromXml(XmlPullParser in, int outerTagDepth,
+                boolean areCredentialsEncrypted,
+                @NonNull WifiConfigStoreEncryptionUtil encryptionUtil)
                 throws XmlPullParserException, IOException {
             WifiEnterpriseConfig enterpriseConfig = new WifiEnterpriseConfig();
 
@@ -1144,5 +1159,66 @@ public class XmlUtil {
             return enterpriseConfig;
         }
     }
+
+    /**
+     * Utility class to serialize and deseriaize {@link EncryptedData} object to XML &
+     * vice versa. This is used by {@link com.android.server.wifi.WifiConfigStore} module.
+     */
+    public static class EncryptedDataXmlUtil {
+        /**
+         * List of XML tags corresponding to EncryptedData object elements.
+         */
+        private static final String XML_TAG_ENCRYPTED_DATA = "EncryptedData";
+        private static final String XML_TAG_IV = "IV";
+
+        /**
+         * Write the NetworkSelectionStatus data elements from the provided status to the XML
+         * stream.
+         *
+         * @param out           XmlSerializer instance pointing to the XML stream.
+         * @param encryptedData EncryptedData object to be serialized.
+         */
+        public static void writeToXml(XmlSerializer out, EncryptedData encryptedData)
+                throws XmlPullParserException, IOException {
+            XmlUtil.writeNextValue(
+                    out, XML_TAG_ENCRYPTED_DATA, encryptedData.getEncryptedData());
+            XmlUtil.writeNextValue(out, XML_TAG_IV, encryptedData.getIv());
+        }
+
+        /**
+         * Parses the EncryptedData data elements from the provided XML stream to a
+         * EncryptedData object.
+         *
+         * @param in            XmlPullParser instance pointing to the XML stream.
+         * @param outerTagDepth depth of the outer tag in the XML document.
+         * @return EncryptedData object if parsing is successful, null otherwise.
+         */
+        public static EncryptedData parseFromXml(XmlPullParser in, int outerTagDepth)
+                throws XmlPullParserException, IOException {
+            byte[] encryptedData = null;
+            byte[] iv = null;
+
+            // Loop through and parse out all the elements from the stream within this section.
+            while (!XmlUtil.isNextSectionEnd(in, outerTagDepth)) {
+                String[] valueName = new String[1];
+                Object value = XmlUtil.readCurrentValue(in, valueName);
+                if (valueName[0] == null) {
+                    throw new XmlPullParserException("Missing value name");
+                }
+                switch (valueName[0]) {
+                    case XML_TAG_ENCRYPTED_DATA:
+                        encryptedData = (byte[]) value;
+                        break;
+                    case XML_TAG_IV:
+                        iv = (byte[]) value;
+                        break;
+                    default:
+                        throw new XmlPullParserException(
+                                "Unknown value name found: " + valueName[0]);
+                }
+            }
+            return new EncryptedData(encryptedData, iv);
+        }
+    }
 }