diff --git a/keystore2/Android.bp b/keystore2/Android.bp
index 32493c0..9dc34d2 100644
--- a/keystore2/Android.bp
+++ b/keystore2/Android.bp
@@ -108,7 +108,7 @@
         "libbinder_rs",
         "libkeystore2",
         "liblog_rust",
-        "libvpnprofilestore-rust",
+        "liblegacykeystore-rust",
     ],
     init_rc: ["keystore2.rc"],
 
diff --git a/keystore2/aidl/Android.bp b/keystore2/aidl/Android.bp
index 06fdb48..5e4e22c 100644
--- a/keystore2/aidl/Android.bp
+++ b/keystore2/aidl/Android.bp
@@ -151,8 +151,8 @@
 }
 
 aidl_interface {
-    name: "android.security.vpnprofilestore",
-    srcs: [ "android/security/vpnprofilestore/*.aidl" ],
+    name: "android.security.legacykeystore",
+    srcs: [ "android/security/legacykeystore/*.aidl" ],
     unstable: true,
     backend: {
         java: {
@@ -162,6 +162,10 @@
         rust: {
             enabled: true,
         },
+        ndk: {
+            enabled: true,
+            apps_enabled: false,
+        }
     },
 }
 
diff --git a/keystore2/aidl/android/security/legacykeystore/ILegacyKeystore.aidl b/keystore2/aidl/android/security/legacykeystore/ILegacyKeystore.aidl
new file mode 100644
index 0000000..fe93673
--- /dev/null
+++ b/keystore2/aidl/android/security/legacykeystore/ILegacyKeystore.aidl
@@ -0,0 +1,98 @@
+/*
+ * Copyright (C) 2021 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.
+ */
+
+package android.security.legacykeystore;
+
+/**
+ * Internal interface for accessing and storing legacy keystore blobs.
+ * Before Android S, Keystore offered a key-value store that was intended for storing
+ * data associated with certain types of keys. E.g., public certificates for asymmetric keys.
+ * This key value store no longer exists as part of the Keystore 2.0 protocol.
+ * However, there are some clients that used Keystore in an unintended way.
+ * This interface exists to give these clients a grace period to migrate their keys
+ * out of legacy keystore. In Android S, this legacy keystore may be used as keystore was
+ * used in earlier versions, and provides access to entries that were put into keystore
+ * before Android S.
+ *
+ * DEPRECATION NOTICE: In Android T, the `put` function is slated to be removed.
+ * This will allow clients to use the `get`, `list`, and `remove` API to migrate blobs out
+ * of legacy keystore.
+ * @hide
+ */
+interface ILegacyKeystore {
+
+    /**
+     * Special value indicating the callers uid.
+     */
+    const int UID_SELF = -1;
+
+    /**
+     * Service specific error code indicating that an unexpected system error occurred.
+     */
+    const int ERROR_SYSTEM_ERROR = 4;
+
+    /**
+     * Service specific error code indicating that the caller does not have the
+     * right to access the requested uid.
+     */
+    const int ERROR_PERMISSION_DENIED = 6;
+
+    /**
+     * Service specific error code indicating that the entry was not found.
+     */
+    const int ERROR_ENTRY_NOT_FOUND = 7;
+
+    /**
+     * Returns the blob stored under the given name.
+     *
+     * @param alias name of the blob entry.
+     * @param uid designates the legacy namespace. Specify UID_SELF for the caller's namespace.
+     * @return The unstructured blob that was passed as blob parameter into put()
+     */
+    byte[] get(in String alias, int uid);
+
+    /**
+     * Stores one entry as unstructured blob under the given alias.
+     * Overwrites existing entries with the same alias.
+     *
+     * @param alias name of the new entry.
+     * @param uid designates the legacy namespace. Specify UID_SELF for the caller's namespace.
+     * @param blob the payload of the new entry.
+     *
+     * IMPORTANT DEPRECATION NOTICE: This function is slated to be removed in Android T.
+     *     Do not add new callers. The remaining functionality will remain for the purpose
+     *     of migrating legacy configuration out.
+     */
+    void put(in String alias, int uid, in byte[] blob);
+
+    /**
+     * Deletes the entry under the given alias.
+     *
+     * @param alias name of the entry to be removed.
+     * @param uid designates the legacy namespace of the entry. Specify UID_SELF for the caller's
+     *            namespace.
+     */
+    void remove(in String alias, int uid);
+
+    /**
+     * Returns a list of aliases of entries stored. The list is filtered by prefix.
+     * The resulting strings are the full aliases including the prefix.
+     *
+     * @param prefix used to filter results.
+     * @param uid legacy namespace to list. Specify UID_SELF for caller's namespace.
+     */
+    String[] list(in String prefix, int uid);
+}
diff --git a/keystore2/aidl/android/security/vpnprofilestore/IVpnProfileStore.aidl b/keystore2/aidl/android/security/vpnprofilestore/IVpnProfileStore.aidl
deleted file mode 100644
index 8375b7b..0000000
--- a/keystore2/aidl/android/security/vpnprofilestore/IVpnProfileStore.aidl
+++ /dev/null
@@ -1,57 +0,0 @@
-/*
- * Copyright (C) 2021 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.
- */
-
-package android.security.vpnprofilestore;
-
-/**
- * Internal interface for accessing and storing VPN profiles.
- * @hide
- */
-interface IVpnProfileStore {
-    /**
-     * Service specific error code indicating that the profile was not found.
-     */
-    const int ERROR_PROFILE_NOT_FOUND = 1;
-
-    /**
-     * Service specific error code indicating that an unexpected system error occurred.
-     */
-    const int ERROR_SYSTEM_ERROR = 2;
-
-    /**
-     * Returns the profile stored under the given alias.
-     *
-     * @param alias name of the profile.
-     * @return The unstructured blob that was passed as profile parameter into put()
-     */
-    byte[] get(in String alias);
-
-    /**
-     * Stores one profile as unstructured blob under the given alias.
-     */
-    void put(in String alias, in byte[] profile);
-
-    /**
-     * Deletes the profile under the given alias.
-     */
-    void remove(in String alias);
-
-    /**
-     * Returns a list of aliases of profiles stored. The list is filtered by prefix.
-     * The resulting strings are the full aliases including the prefix.
-     */
-    String[] list(in String prefix);
-}
\ No newline at end of file
diff --git a/keystore2/vpnprofilestore/Android.bp b/keystore2/legacykeystore/Android.bp
similarity index 85%
rename from keystore2/vpnprofilestore/Android.bp
rename to keystore2/legacykeystore/Android.bp
index 7ddf0d6..c2890cc 100644
--- a/keystore2/vpnprofilestore/Android.bp
+++ b/keystore2/legacykeystore/Android.bp
@@ -22,13 +22,13 @@
 }
 
 rust_library {
-    name: "libvpnprofilestore-rust",
-    crate_name: "vpnprofilestore",
+    name: "liblegacykeystore-rust",
+    crate_name: "legacykeystore",
     srcs: [
         "lib.rs",
     ],
     rustlibs: [
-        "android.security.vpnprofilestore-rust",
+        "android.security.legacykeystore-rust",
         "libanyhow",
         "libbinder_rs",
         "libkeystore2",
@@ -39,13 +39,13 @@
 }
 
 rust_test {
-    name: "vpnprofilestore_test",
-    crate_name: "vpnprofilestore",
+    name: "legacykeystore_test",
+    crate_name: "legacykeystore",
     srcs: ["lib.rs"],
     test_suites: ["general-tests"],
     auto_gen_config: true,
     rustlibs: [
-        "android.security.vpnprofilestore-rust",
+        "android.security.legacykeystore-rust",
         "libanyhow",
         "libbinder_rs",
         "libkeystore2",
diff --git a/keystore2/vpnprofilestore/lib.rs b/keystore2/legacykeystore/lib.rs
similarity index 63%
rename from keystore2/vpnprofilestore/lib.rs
rename to keystore2/legacykeystore/lib.rs
index 548bec5..8a4d7d8 100644
--- a/keystore2/vpnprofilestore/lib.rs
+++ b/keystore2/legacykeystore/lib.rs
@@ -12,13 +12,14 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//! Implements the android.security.vpnprofilestore interface.
+//! Implements the android.security.legacykeystore interface.
 
-use android_security_vpnprofilestore::aidl::android::security::vpnprofilestore::{
-    IVpnProfileStore::BnVpnProfileStore, IVpnProfileStore::IVpnProfileStore,
-    IVpnProfileStore::ERROR_PROFILE_NOT_FOUND, IVpnProfileStore::ERROR_SYSTEM_ERROR,
+use android_security_legacykeystore::aidl::android::security::legacykeystore::{
+    ILegacyKeystore::BnLegacyKeystore, ILegacyKeystore::ILegacyKeystore,
+    ILegacyKeystore::ERROR_ENTRY_NOT_FOUND, ILegacyKeystore::ERROR_PERMISSION_DENIED,
+    ILegacyKeystore::ERROR_SYSTEM_ERROR, ILegacyKeystore::UID_SELF,
 };
-use android_security_vpnprofilestore::binder::{
+use android_security_legacykeystore::binder::{
     BinderFeatures, ExceptionCode, Result as BinderResult, Status as BinderStatus, Strong,
     ThreadState,
 };
@@ -42,7 +43,7 @@
             conn: Connection::open(db_file).context("Failed to initialize SQLite connection.")?,
         };
 
-        db.init_tables().context("Trying to initialize vpnstore db.")?;
+        db.init_tables().context("Trying to initialize legacy keystore db.")?;
         Ok(db)
     }
 
@@ -110,11 +111,11 @@
         })
     }
 
-    fn put(&mut self, caller_uid: u32, alias: &str, profile: &[u8]) -> Result<()> {
+    fn put(&mut self, caller_uid: u32, alias: &str, entry: &[u8]) -> Result<()> {
         self.with_transaction(TransactionBehavior::Immediate, |tx| {
             tx.execute(
                 "INSERT OR REPLACE INTO profiles (owner, alias, profile) values (?, ?, ?)",
-                params![caller_uid, alias, profile,],
+                params![caller_uid, alias, entry,],
             )
             .context("In put: Failed to insert or replace.")?;
             Ok(())
@@ -129,7 +130,7 @@
                 |row| row.get(0),
             )
             .optional()
-            .context("In get: failed loading profile.")
+            .context("In get: failed loading entry.")
         })
     }
 
@@ -145,11 +146,11 @@
     }
 }
 
-/// This is the main VpnProfileStore error type, it wraps binder exceptions and the
-/// VnpStore errors.
+/// This is the main LegacyKeystore error type, it wraps binder exceptions and the
+/// LegacyKeystore errors.
 #[derive(Debug, thiserror::Error, PartialEq)]
 pub enum Error {
-    /// Wraps a VpnProfileStore error code.
+    /// Wraps a LegacyKeystore error code.
     #[error("Error::Error({0:?})")]
     Error(i32),
     /// Wraps a Binder exception code other than a service specific exception.
@@ -163,16 +164,21 @@
         Error::Error(ERROR_SYSTEM_ERROR)
     }
 
-    /// Short hand for `Error::Error(ERROR_PROFILE_NOT_FOUND)`
+    /// Short hand for `Error::Error(ERROR_ENTRY_NOT_FOUND)`
     pub fn not_found() -> Self {
-        Error::Error(ERROR_PROFILE_NOT_FOUND)
+        Error::Error(ERROR_ENTRY_NOT_FOUND)
+    }
+
+    /// Short hand for `Error::Error(ERROR_PERMISSION_DENIED)`
+    pub fn perm() -> Self {
+        Error::Error(ERROR_PERMISSION_DENIED)
     }
 }
 
-/// This function should be used by vpnprofilestore service calls to translate error conditions
+/// This function should be used by legacykeystore service calls to translate error conditions
 /// into service specific exceptions.
 ///
-/// All error conditions get logged by this function, except for ERROR_PROFILE_NOT_FOUND error.
+/// All error conditions get logged by this function, except for ERROR_ENTRY_NOT_FOUND error.
 ///
 /// `Error::Error(x)` variants get mapped onto a service specific error code of `x`.
 ///
@@ -189,8 +195,8 @@
         |e| {
             let root_cause = e.root_cause();
             let (rc, log_error) = match root_cause.downcast_ref::<Error>() {
-                // Make the profile not found errors silent.
-                Some(Error::Error(ERROR_PROFILE_NOT_FOUND)) => (ERROR_PROFILE_NOT_FOUND, false),
+                // Make the entry not found errors silent.
+                Some(Error::Error(ERROR_ENTRY_NOT_FOUND)) => (ERROR_ENTRY_NOT_FOUND, false),
                 Some(Error::Error(e)) => (*e, true),
                 Some(Error::Binder(_, _)) | None => (ERROR_SYSTEM_ERROR, true),
             };
@@ -203,8 +209,8 @@
     )
 }
 
-/// Implements IVpnProfileStore AIDL interface.
-pub struct VpnProfileStore {
+/// Implements ILegacyKeystore AIDL interface.
+pub struct LegacyKeystore {
     db_path: PathBuf,
     async_task: AsyncTask,
 }
@@ -215,72 +221,93 @@
     db_path: PathBuf,
 }
 
-impl VpnProfileStore {
-    /// Creates a new VpnProfileStore instance.
-    pub fn new_native_binder(path: &Path) -> Strong<dyn IVpnProfileStore> {
+impl LegacyKeystore {
+    /// Note: The filename was chosen before the purpose of this module was extended.
+    ///       It is kept for backward compatibility with early adopters.
+    const LEGACY_KEYSTORE_FILE_NAME: &'static str = "vpnprofilestore.sqlite";
+
+    /// Creates a new LegacyKeystore instance.
+    pub fn new_native_binder(path: &Path) -> Strong<dyn ILegacyKeystore> {
         let mut db_path = path.to_path_buf();
-        db_path.push("vpnprofilestore.sqlite");
+        db_path.push(Self::LEGACY_KEYSTORE_FILE_NAME);
 
         let result = Self { db_path, async_task: Default::default() };
         result.init_shelf(path);
-        BnVpnProfileStore::new_binder(result, BinderFeatures::default())
+        BnLegacyKeystore::new_binder(result, BinderFeatures::default())
     }
 
     fn open_db(&self) -> Result<DB> {
         DB::new(&self.db_path).context("In open_db: Failed to open db.")
     }
 
-    fn get(&self, alias: &str) -> Result<Vec<u8>> {
-        let mut db = self.open_db().context("In get.")?;
+    fn get_effective_uid(uid: i32) -> Result<u32> {
+        const AID_SYSTEM: u32 = 1000;
+        const AID_WIFI: u32 = 1010;
         let calling_uid = ThreadState::get_calling_uid();
+        let uid = uid as u32;
 
-        if let Some(profile) =
-            db.get(calling_uid, alias).context("In get: Trying to load profile from DB.")?
-        {
-            return Ok(profile);
+        if uid == UID_SELF as u32 || uid == calling_uid {
+            Ok(calling_uid)
+        } else if calling_uid == AID_SYSTEM && uid == AID_WIFI {
+            // The only exception for legacy reasons is allowing SYSTEM to access
+            // the WIFI namespace.
+            // IMPORTANT: If you attempt to add more exceptions, it means you are adding
+            // more callers to this deprecated feature. DON'T!
+            Ok(AID_WIFI)
+        } else {
+            Err(Error::perm()).with_context(|| {
+                format!("In get_effective_uid: caller: {}, requested uid: {}.", calling_uid, uid)
+            })
         }
-        if self.get_legacy(calling_uid, alias).context("In get: Trying to migrate legacy blob.")? {
+    }
+
+    fn get(&self, alias: &str, uid: i32) -> Result<Vec<u8>> {
+        let mut db = self.open_db().context("In get.")?;
+        let uid = Self::get_effective_uid(uid).context("In get.")?;
+
+        if let Some(entry) = db.get(uid, alias).context("In get: Trying to load entry from DB.")? {
+            return Ok(entry);
+        }
+        if self.get_legacy(uid, alias).context("In get: Trying to migrate legacy blob.")? {
             // If we were able to migrate a legacy blob try again.
-            if let Some(profile) =
-                db.get(calling_uid, alias).context("In get: Trying to load profile from DB.")?
+            if let Some(entry) =
+                db.get(uid, alias).context("In get: Trying to load entry from DB.")?
             {
-                return Ok(profile);
+                return Ok(entry);
             }
         }
-        Err(Error::not_found()).context("In get: No such profile.")
+        Err(Error::not_found()).context("In get: No such entry.")
     }
 
-    fn put(&self, alias: &str, profile: &[u8]) -> Result<()> {
-        let calling_uid = ThreadState::get_calling_uid();
-        // In order to make sure that we don't have stale legacy profiles, make sure they are
+    fn put(&self, alias: &str, uid: i32, entry: &[u8]) -> Result<()> {
+        let uid = Self::get_effective_uid(uid).context("In put.")?;
+        // In order to make sure that we don't have stale legacy entries, make sure they are
         // migrated before replacing them.
-        let _ = self.get_legacy(calling_uid, alias);
+        let _ = self.get_legacy(uid, alias);
         let mut db = self.open_db().context("In put.")?;
-        db.put(calling_uid, alias, profile).context("In put: Trying to insert profile into DB.")
+        db.put(uid, alias, entry).context("In put: Trying to insert entry into DB.")
     }
 
-    fn remove(&self, alias: &str) -> Result<()> {
-        let calling_uid = ThreadState::get_calling_uid();
+    fn remove(&self, alias: &str, uid: i32) -> Result<()> {
+        let uid = Self::get_effective_uid(uid).context("In remove.")?;
         let mut db = self.open_db().context("In remove.")?;
-        // In order to make sure that we don't have stale legacy profiles, make sure they are
+        // In order to make sure that we don't have stale legacy entries, make sure they are
         // migrated before removing them.
-        let _ = self.get_legacy(calling_uid, alias);
-        let removed = db
-            .remove(calling_uid, alias)
-            .context("In remove: Trying to remove profile from DB.")?;
+        let _ = self.get_legacy(uid, alias);
+        let removed =
+            db.remove(uid, alias).context("In remove: Trying to remove entry from DB.")?;
         if removed {
             Ok(())
         } else {
-            Err(Error::not_found()).context("In remove: No such profile.")
+            Err(Error::not_found()).context("In remove: No such entry.")
         }
     }
 
-    fn list(&self, prefix: &str) -> Result<Vec<String>> {
+    fn list(&self, prefix: &str, uid: i32) -> Result<Vec<String>> {
         let mut db = self.open_db().context("In list.")?;
-        let calling_uid = ThreadState::get_calling_uid();
-        let mut result = self.list_legacy(calling_uid).context("In list.")?;
-        result
-            .append(&mut db.list(calling_uid).context("In list: Trying to get list of profiles.")?);
+        let uid = Self::get_effective_uid(uid).context("In list.")?;
+        let mut result = self.list_legacy(uid).context("In list.")?;
+        result.append(&mut db.list(uid).context("In list: Trying to get list of entries.")?);
         result = result.into_iter().filter(|s| s.starts_with(prefix)).collect();
         result.sort_unstable();
         result.dedup();
@@ -291,7 +318,7 @@
         let mut db_path = path.to_path_buf();
         self.async_task.queue_hi(move |shelf| {
             let legacy_loader = LegacyBlobLoader::new(&db_path);
-            db_path.push("vpnprofilestore.sqlite");
+            db_path.push(Self::LEGACY_KEYSTORE_FILE_NAME);
 
             shelf.put(AsyncState { legacy_loader, db_path, recently_imported: Default::default() });
         })
@@ -313,8 +340,8 @@
         self.do_serialized(move |state| {
             state
                 .legacy_loader
-                .list_vpn_profiles(uid)
-                .context("Trying to list legacy vnp profiles.")
+                .list_legacy_keystore_entries(uid)
+                .context("Trying to list legacy keystore entries.")
         })
         .context("In list_legacy.")
     }
@@ -327,8 +354,8 @@
             }
             let mut db = DB::new(&state.db_path).context("In open_db: Failed to open db.")?;
             let migrated =
-                Self::migrate_one_legacy_profile(uid, &alias, &state.legacy_loader, &mut db)
-                    .context("Trying to migrate legacy vpn profile.")?;
+                Self::migrate_one_legacy_entry(uid, &alias, &state.legacy_loader, &mut db)
+                    .context("Trying to migrate legacy keystore entries.")?;
             if migrated {
                 state.recently_imported.insert((uid, alias));
             }
@@ -337,21 +364,21 @@
         .context("In get_legacy.")
     }
 
-    fn migrate_one_legacy_profile(
+    fn migrate_one_legacy_entry(
         uid: u32,
         alias: &str,
         legacy_loader: &LegacyBlobLoader,
         db: &mut DB,
     ) -> Result<bool> {
         let blob = legacy_loader
-            .read_vpn_profile(uid, alias)
-            .context("In migrate_one_legacy_profile: Trying to read legacy vpn profile.")?;
-        if let Some(profile) = blob {
-            db.put(uid, alias, &profile)
-                .context("In migrate_one_legacy_profile: Trying to insert profile into DB.")?;
+            .read_legacy_keystore_entry(uid, alias)
+            .context("In migrate_one_legacy_entry: Trying to read legacy keystore entry.")?;
+        if let Some(entry) = blob {
+            db.put(uid, alias, &entry)
+                .context("In migrate_one_legacy_entry: Trying to insert entry into DB.")?;
             legacy_loader
-                .remove_vpn_profile(uid, alias)
-                .context("In migrate_one_legacy_profile: Trying to delete legacy profile.")?;
+                .remove_legacy_keystore_entry(uid, alias)
+                .context("In migrate_one_legacy_entry: Trying to delete legacy keystore entry.")?;
             Ok(true)
         } else {
             Ok(false)
@@ -359,24 +386,24 @@
     }
 }
 
-impl binder::Interface for VpnProfileStore {}
+impl binder::Interface for LegacyKeystore {}
 
-impl IVpnProfileStore for VpnProfileStore {
-    fn get(&self, alias: &str) -> BinderResult<Vec<u8>> {
-        let _wp = wd::watch_millis("IVpnProfileStore::get", 500);
-        map_or_log_err(self.get(alias), Ok)
+impl ILegacyKeystore for LegacyKeystore {
+    fn get(&self, alias: &str, uid: i32) -> BinderResult<Vec<u8>> {
+        let _wp = wd::watch_millis("ILegacyKeystore::get", 500);
+        map_or_log_err(self.get(alias, uid), Ok)
     }
-    fn put(&self, alias: &str, profile: &[u8]) -> BinderResult<()> {
-        let _wp = wd::watch_millis("IVpnProfileStore::put", 500);
-        map_or_log_err(self.put(alias, profile), Ok)
+    fn put(&self, alias: &str, uid: i32, entry: &[u8]) -> BinderResult<()> {
+        let _wp = wd::watch_millis("ILegacyKeystore::put", 500);
+        map_or_log_err(self.put(alias, uid, entry), Ok)
     }
-    fn remove(&self, alias: &str) -> BinderResult<()> {
-        let _wp = wd::watch_millis("IVpnProfileStore::remove", 500);
-        map_or_log_err(self.remove(alias), Ok)
+    fn remove(&self, alias: &str, uid: i32) -> BinderResult<()> {
+        let _wp = wd::watch_millis("ILegacyKeystore::remove", 500);
+        map_or_log_err(self.remove(alias, uid), Ok)
     }
-    fn list(&self, prefix: &str) -> BinderResult<Vec<String>> {
-        let _wp = wd::watch_millis("IVpnProfileStore::list", 500);
-        map_or_log_err(self.list(prefix), Ok)
+    fn list(&self, prefix: &str, uid: i32) -> BinderResult<Vec<String>> {
+        let _wp = wd::watch_millis("ILegacyKeystore::list", 500);
+        map_or_log_err(self.list(prefix, uid), Ok)
     }
 }
 
@@ -396,12 +423,12 @@
     static TEST_BLOB4: &[u8] = &[3, 2, 3, 4, 5, 6, 7, 8, 9, 0];
 
     #[test]
-    fn test_profile_db() {
-        let test_dir = TempDir::new("profiledb_test_").expect("Failed to create temp dir.");
-        let mut db =
-            DB::new(&test_dir.build().push("vpnprofile.sqlite")).expect("Failed to open database.");
+    fn test_entry_db() {
+        let test_dir = TempDir::new("entrydb_test_").expect("Failed to create temp dir.");
+        let mut db = DB::new(&test_dir.build().push(LegacyKeystore::LEGACY_KEYSTORE_FILE_NAME))
+            .expect("Failed to open database.");
 
-        // Insert three profiles for owner 2.
+        // Insert three entries for owner 2.
         db.put(2, "test1", TEST_BLOB1).expect("Failed to insert test1.");
         db.put(2, "test2", TEST_BLOB2).expect("Failed to insert test2.");
         db.put(2, "test3", TEST_BLOB3).expect("Failed to insert test3.");
@@ -409,73 +436,59 @@
         // Check list returns all inserted aliases.
         assert_eq!(
             vec!["test1".to_string(), "test2".to_string(), "test3".to_string(),],
-            db.list(2).expect("Failed to list profiles.")
+            db.list(2).expect("Failed to list entries.")
         );
 
-        // There should be no profiles for owner 1.
-        assert_eq!(Vec::<String>::new(), db.list(1).expect("Failed to list profiles."));
+        // There should be no entries for owner 1.
+        assert_eq!(Vec::<String>::new(), db.list(1).expect("Failed to list entries."));
 
         // Check the content of the three entries.
-        assert_eq!(
-            Some(TEST_BLOB1),
-            db.get(2, "test1").expect("Failed to get profile.").as_deref()
-        );
-        assert_eq!(
-            Some(TEST_BLOB2),
-            db.get(2, "test2").expect("Failed to get profile.").as_deref()
-        );
-        assert_eq!(
-            Some(TEST_BLOB3),
-            db.get(2, "test3").expect("Failed to get profile.").as_deref()
-        );
+        assert_eq!(Some(TEST_BLOB1), db.get(2, "test1").expect("Failed to get entry.").as_deref());
+        assert_eq!(Some(TEST_BLOB2), db.get(2, "test2").expect("Failed to get entry.").as_deref());
+        assert_eq!(Some(TEST_BLOB3), db.get(2, "test3").expect("Failed to get entry.").as_deref());
 
         // Remove test2 and check and check that it is no longer retrievable.
-        assert!(db.remove(2, "test2").expect("Failed to remove profile."));
-        assert!(db.get(2, "test2").expect("Failed to get profile.").is_none());
+        assert!(db.remove(2, "test2").expect("Failed to remove entry."));
+        assert!(db.get(2, "test2").expect("Failed to get entry.").is_none());
 
         // test2 should now no longer be in the list.
         assert_eq!(
             vec!["test1".to_string(), "test3".to_string(),],
-            db.list(2).expect("Failed to list profiles.")
+            db.list(2).expect("Failed to list entries.")
         );
 
         // Put on existing alias replaces it.
         // Verify test1 is TEST_BLOB1.
-        assert_eq!(
-            Some(TEST_BLOB1),
-            db.get(2, "test1").expect("Failed to get profile.").as_deref()
-        );
+        assert_eq!(Some(TEST_BLOB1), db.get(2, "test1").expect("Failed to get entry.").as_deref());
         db.put(2, "test1", TEST_BLOB4).expect("Failed to replace test1.");
         // Verify test1 is TEST_BLOB4.
-        assert_eq!(
-            Some(TEST_BLOB4),
-            db.get(2, "test1").expect("Failed to get profile.").as_deref()
-        );
+        assert_eq!(Some(TEST_BLOB4), db.get(2, "test1").expect("Failed to get entry.").as_deref());
     }
 
     #[test]
-    fn concurrent_vpn_profile_test() -> Result<()> {
+    fn concurrent_legacy_keystore_entry_test() -> Result<()> {
         let temp_dir = Arc::new(
-            TempDir::new("concurrent_vpn_profile_test_").expect("Failed to create temp dir."),
+            TempDir::new("concurrent_legacy_keystore_entry_test_")
+                .expect("Failed to create temp dir."),
         );
 
-        let db_path = temp_dir.build().push("vpnprofile.sqlite").to_owned();
+        let db_path = temp_dir.build().push(LegacyKeystore::LEGACY_KEYSTORE_FILE_NAME).to_owned();
 
         let test_begin = Instant::now();
 
         let mut db = DB::new(&db_path).expect("Failed to open database.");
-        const PROFILE_COUNT: u32 = 5000u32;
-        const PROFILE_DB_COUNT: u32 = 5000u32;
+        const ENTRY_COUNT: u32 = 5000u32;
+        const ENTRY_DB_COUNT: u32 = 5000u32;
 
-        let mut actual_profile_count = PROFILE_COUNT;
-        // First insert PROFILE_COUNT profiles.
-        for count in 0..PROFILE_COUNT {
+        let mut actual_entry_count = ENTRY_COUNT;
+        // First insert ENTRY_COUNT entries.
+        for count in 0..ENTRY_COUNT {
             if Instant::now().duration_since(test_begin) >= Duration::from_secs(15) {
-                actual_profile_count = count;
+                actual_entry_count = count;
                 break;
             }
             let alias = format!("test_alias_{}", count);
-            db.put(1, &alias, TEST_BLOB1).expect("Failed to add profile (1).");
+            db.put(1, &alias, TEST_BLOB1).expect("Failed to add entry (1).");
         }
 
         // Insert more keys from a different thread and into a different namespace.
@@ -483,16 +496,16 @@
         let handle1 = thread::spawn(move || {
             let mut db = DB::new(&db_path1).expect("Failed to open database.");
 
-            for count in 0..actual_profile_count {
+            for count in 0..actual_entry_count {
                 if Instant::now().duration_since(test_begin) >= Duration::from_secs(40) {
                     return;
                 }
                 let alias = format!("test_alias_{}", count);
-                db.put(2, &alias, TEST_BLOB2).expect("Failed to add profile (2).");
+                db.put(2, &alias, TEST_BLOB2).expect("Failed to add entry (2).");
             }
 
             // Then delete them again.
-            for count in 0..actual_profile_count {
+            for count in 0..actual_entry_count {
                 if Instant::now().duration_since(test_begin) >= Duration::from_secs(40) {
                     return;
                 }
@@ -501,12 +514,12 @@
             }
         });
 
-        // And start deleting the first set of profiles.
+        // And start deleting the first set of entries.
         let db_path2 = db_path.clone();
         let handle2 = thread::spawn(move || {
             let mut db = DB::new(&db_path2).expect("Failed to open database.");
 
-            for count in 0..actual_profile_count {
+            for count in 0..actual_entry_count {
                 if Instant::now().duration_since(test_begin) >= Duration::from_secs(40) {
                     return;
                 }
@@ -516,16 +529,16 @@
         });
 
         // While a lot of inserting and deleting is going on we have to open database connections
-        // successfully and then insert and delete a specific profile.
+        // successfully and then insert and delete a specific entry.
         let db_path3 = db_path.clone();
         let handle3 = thread::spawn(move || {
-            for _count in 0..PROFILE_DB_COUNT {
+            for _count in 0..ENTRY_DB_COUNT {
                 if Instant::now().duration_since(test_begin) >= Duration::from_secs(40) {
                     return;
                 }
                 let mut db = DB::new(&db_path3).expect("Failed to open database.");
 
-                db.put(3, &TEST_ALIAS, TEST_BLOB3).expect("Failed to add profile (3).");
+                db.put(3, &TEST_ALIAS, TEST_BLOB3).expect("Failed to add entry (3).");
 
                 db.remove(3, &TEST_ALIAS).expect("Remove failed (3).");
             }
@@ -534,14 +547,14 @@
         // While thread 3 is inserting and deleting TEST_ALIAS, we try to get the alias.
         // This may yield an entry or none, but it must not fail.
         let handle4 = thread::spawn(move || {
-            for _count in 0..PROFILE_DB_COUNT {
+            for _count in 0..ENTRY_DB_COUNT {
                 if Instant::now().duration_since(test_begin) >= Duration::from_secs(40) {
                     return;
                 }
                 let mut db = DB::new(&db_path).expect("Failed to open database.");
 
                 // This may return Some or None but it must not fail.
-                db.get(3, &TEST_ALIAS).expect("Failed to get profile (4).");
+                db.get(3, &TEST_ALIAS).expect("Failed to get entry (4).");
             }
         });
 
diff --git a/keystore2/src/keystore2_main.rs b/keystore2/src/keystore2_main.rs
index 53461da..45338c4 100644
--- a/keystore2/src/keystore2_main.rs
+++ b/keystore2/src/keystore2_main.rs
@@ -22,16 +22,16 @@
 use keystore2::service::KeystoreService;
 use keystore2::{apc::ApcManager, shared_secret_negotiation};
 use keystore2::{authorization::AuthorizationManager, id_rotation::IdRotationState};
+use legacykeystore::LegacyKeystore;
 use log::{error, info};
 use std::{panic, path::Path, sync::mpsc::channel};
-use vpnprofilestore::VpnProfileStore;
 
 static KS2_SERVICE_NAME: &str = "android.system.keystore2.IKeystoreService/default";
 static APC_SERVICE_NAME: &str = "android.security.apc";
 static AUTHORIZATION_SERVICE_NAME: &str = "android.security.authorization";
 static REMOTE_PROVISIONING_SERVICE_NAME: &str = "android.security.remoteprovisioning";
 static USER_MANAGER_SERVICE_NAME: &str = "android.security.maintenance";
-static VPNPROFILESTORE_SERVICE_NAME: &str = "android.security.vpnprofilestore";
+static LEGACY_KEYSTORE_SERVICE_NAME: &str = "android.security.legacykeystore";
 
 /// Keystore 2.0 takes one argument which is a path indicating its designated working directory.
 fn main() {
@@ -120,14 +120,14 @@
         });
     }
 
-    let vpnprofilestore = VpnProfileStore::new_native_binder(
+    let legacykeystore = LegacyKeystore::new_native_binder(
         &keystore2::globals::DB_PATH.read().expect("Could not get DB_PATH."),
     );
-    binder::add_service(VPNPROFILESTORE_SERVICE_NAME, vpnprofilestore.as_binder()).unwrap_or_else(
+    binder::add_service(LEGACY_KEYSTORE_SERVICE_NAME, legacykeystore.as_binder()).unwrap_or_else(
         |e| {
             panic!(
                 "Failed to register service {} because of {:?}.",
-                VPNPROFILESTORE_SERVICE_NAME, e
+                LEGACY_KEYSTORE_SERVICE_NAME, e
             );
         },
     );
diff --git a/keystore2/src/legacy_blob.rs b/keystore2/src/legacy_blob.rs
index 9eebb36..e0d2133 100644
--- a/keystore2/src/legacy_blob.rs
+++ b/keystore2/src/legacy_blob.rs
@@ -599,6 +599,15 @@
     //  * USRCERT was used for public certificates of USRPKEY entries. But KeyChain also
     //            used this for user installed certificates without private key material.
 
+    const KNOWN_KEYSTORE_PREFIXES: &'static [&'static str] =
+        &["USRPKEY_", "USRSKEY_", "USRCERT_", "CACERT_"];
+
+    fn is_keystore_alias(encoded_alias: &str) -> bool {
+        // We can check the encoded alias because the prefixes we are interested
+        // in are all in the printable range that don't get mangled.
+        Self::KNOWN_KEYSTORE_PREFIXES.iter().any(|prefix| encoded_alias.starts_with(prefix))
+    }
+
     fn read_km_blob_file(&self, uid: u32, alias: &str) -> Result<Option<(Blob, String)>> {
         let mut iter = ["USRPKEY", "USRSKEY"].iter();
 
@@ -630,28 +639,28 @@
         Ok(Some(Self::new_from_stream(&mut file).context("In read_generic_blob.")?))
     }
 
-    /// Read a legacy vpn profile blob.
-    pub fn read_vpn_profile(&self, uid: u32, alias: &str) -> Result<Option<Vec<u8>>> {
-        let path = match self.make_vpn_profile_filename(uid, alias) {
+    /// Read a legacy keystore entry blob.
+    pub fn read_legacy_keystore_entry(&self, uid: u32, alias: &str) -> Result<Option<Vec<u8>>> {
+        let path = match self.make_legacy_keystore_entry_filename(uid, alias) {
             Some(path) => path,
             None => return Ok(None),
         };
 
-        let blob =
-            Self::read_generic_blob(&path).context("In read_vpn_profile: Failed to read blob.")?;
+        let blob = Self::read_generic_blob(&path)
+            .context("In read_legacy_keystore_entry: Failed to read blob.")?;
 
         Ok(blob.and_then(|blob| match blob.value {
             BlobValue::Generic(blob) => Some(blob),
             _ => {
-                log::info!("Unexpected vpn profile blob type. Ignoring");
+                log::info!("Unexpected legacy keystore entry blob type. Ignoring");
                 None
             }
         }))
     }
 
-    /// Remove a vpn profile by the name alias with owner uid.
-    pub fn remove_vpn_profile(&self, uid: u32, alias: &str) -> Result<()> {
-        let path = match self.make_vpn_profile_filename(uid, alias) {
+    /// Remove a legacy keystore entry by the name alias with owner uid.
+    pub fn remove_legacy_keystore_entry(&self, uid: u32, alias: &str) -> Result<()> {
+        let path = match self.make_legacy_keystore_entry_filename(uid, alias) {
             Some(path) => path,
             None => return Ok(()),
         };
@@ -659,25 +668,17 @@
         if let Err(e) = Self::with_retry_interrupted(|| fs::remove_file(path.as_path())) {
             match e.kind() {
                 ErrorKind::NotFound => return Ok(()),
-                _ => return Err(e).context("In remove_vpn_profile."),
+                _ => return Err(e).context("In remove_legacy_keystore_entry."),
             }
         }
 
         let user_id = uid_to_android_user(uid);
         self.remove_user_dir_if_empty(user_id)
-            .context("In remove_vpn_profile: Trying to remove empty user dir.")
+            .context("In remove_legacy_keystore_entry: Trying to remove empty user dir.")
     }
 
-    fn is_vpn_profile(encoded_alias: &str) -> bool {
-        // We can check the encoded alias because the prefixes we are interested
-        // in are all in the printable range that don't get mangled.
-        encoded_alias.starts_with("VPN_")
-            || encoded_alias.starts_with("PLATFORM_VPN_")
-            || encoded_alias == "LOCKDOWN_VPN"
-    }
-
-    /// List all profiles belonging to the given uid.
-    pub fn list_vpn_profiles(&self, uid: u32) -> Result<Vec<String>> {
+    /// List all entries belonging to the given uid.
+    pub fn list_legacy_keystore_entries(&self, uid: u32) -> Result<Vec<String>> {
         let mut path = self.path.clone();
         let user_id = uid_to_android_user(uid);
         path.push(format!("user_{}", user_id));
@@ -688,7 +689,10 @@
                 ErrorKind::NotFound => return Ok(Default::default()),
                 _ => {
                     return Err(e).context(format!(
-                        "In list_vpn_profiles: Failed to open legacy blob database. {:?}",
+                        concat!(
+                            "In list_legacy_keystore_entries: ,",
+                            "Failed to open legacy blob database: {:?}"
+                        ),
                         path
                     ))
                 }
@@ -696,14 +700,15 @@
         };
         let mut result: Vec<String> = Vec::new();
         for entry in dir {
-            let file_name =
-                entry.context("In list_vpn_profiles: Trying to access dir entry")?.file_name();
+            let file_name = entry
+                .context("In list_legacy_keystore_entries: Trying to access dir entry")?
+                .file_name();
             if let Some(f) = file_name.to_str() {
                 let encoded_alias = &f[uid_str.len() + 1..];
-                if f.starts_with(&uid_str) && Self::is_vpn_profile(encoded_alias) {
+                if f.starts_with(&uid_str) && !Self::is_keystore_alias(encoded_alias) {
                     result.push(
                         Self::decode_alias(encoded_alias)
-                            .context("In list_vpn_profiles: Trying to decode alias.")?,
+                            .context("In list_legacy_keystore_entries: Trying to decode alias.")?,
                     )
                 }
             }
@@ -711,12 +716,15 @@
         Ok(result)
     }
 
-    /// This function constructs the vpn_profile file name which has the form:
-    /// user_<android user id>/<uid>_<alias>.
-    fn make_vpn_profile_filename(&self, uid: u32, alias: &str) -> Option<PathBuf> {
-        // legacy vpn entries must start with VPN_ or PLATFORM_VPN_ or are literally called
-        // LOCKDOWN_VPN.
-        if !Self::is_vpn_profile(alias) {
+    /// This function constructs the legacy blob file name which has the form:
+    /// user_<android user id>/<uid>_<alias>. Legacy blob file names must not use
+    /// known keystore prefixes.
+    fn make_legacy_keystore_entry_filename(&self, uid: u32, alias: &str) -> Option<PathBuf> {
+        // Legacy entries must not use known keystore prefixes.
+        if Self::is_keystore_alias(alias) {
+            log::warn!(
+                "Known keystore prefixes cannot be used with legacy keystore -> ignoring request."
+            );
             return None;
         }
 
@@ -1376,11 +1384,11 @@
     }
 
     #[test]
-    fn list_vpn_profiles_on_non_existing_user() -> Result<()> {
-        let temp_dir = TempDir::new("list_vpn_profiles_on_non_existing_user")?;
+    fn list_legacy_keystore_entries_on_non_existing_user() -> Result<()> {
+        let temp_dir = TempDir::new("list_legacy_keystore_entries_on_non_existing_user")?;
         let legacy_blob_loader = LegacyBlobLoader::new(temp_dir.path());
 
-        assert!(legacy_blob_loader.list_vpn_profiles(20)?.is_empty());
+        assert!(legacy_blob_loader.list_legacy_keystore_entries(20)?.is_empty());
 
         Ok(())
     }