diff --git a/core/java/android/os/storage/IStorageManager.aidl b/core/java/android/os/storage/IStorageManager.aidl
index 4225260..25b2aa7 100644
--- a/core/java/android/os/storage/IStorageManager.aidl
+++ b/core/java/android/os/storage/IStorageManager.aidl
@@ -134,9 +134,9 @@
     @EnforcePermission("MOUNT_UNMOUNT_FILESYSTEMS")
     void setDebugFlags(int flags, int mask) = 60;
     @EnforcePermission("STORAGE_INTERNAL")
-    void createUserKey(int userId, int serialNumber, boolean ephemeral) = 61;
+    void createUserStorageKeys(int userId, int serialNumber, boolean ephemeral) = 61;
     @EnforcePermission("STORAGE_INTERNAL")
-    void destroyUserKey(int userId) = 62;
+    void destroyUserStorageKeys(int userId) = 62;
     @EnforcePermission("STORAGE_INTERNAL")
     void unlockCeStorage(int userId, int serialNumber, in byte[] secret) = 63;
     @EnforcePermission("STORAGE_INTERNAL")
diff --git a/core/java/android/os/storage/StorageManager.java b/core/java/android/os/storage/StorageManager.java
index 5335eaa..8e72e13 100644
--- a/core/java/android/os/storage/StorageManager.java
+++ b/core/java/android/os/storage/StorageManager.java
@@ -1580,19 +1580,51 @@
                 DEFAULT_FULL_THRESHOLD_BYTES);
     }
 
-    /** {@hide} */
-    public void createUserKey(int userId, int serialNumber, boolean ephemeral) {
+    /**
+     * Creates the keys for a user's credential-encrypted (CE) and device-encrypted (DE) storage.
+     * <p>
+     * This creates the user's CE key and DE key for internal storage, then adds them to the kernel.
+     * Then, if the user is not ephemeral, this stores the DE key (encrypted) on flash.  (The CE key
+     * is not stored until {@link IStorageManager#setCeStorageProtection()}.)
+     * <p>
+     * This does not create the CE and DE directories themselves.  For that, see {@link
+     * #prepareUserStorage()}.
+     * <p>
+     * This is only intended to be called by UserManagerService, as part of creating a user.
+     *
+     * @param userId ID of the user
+     * @param serialNumber serial number of the user
+     * @param ephemeral whether the user is ephemeral
+     * @throws RuntimeException on error.  The user's keys already existing is considered an error.
+     * @hide
+     */
+    public void createUserStorageKeys(int userId, int serialNumber, boolean ephemeral) {
         try {
-            mStorageManager.createUserKey(userId, serialNumber, ephemeral);
+            mStorageManager.createUserStorageKeys(userId, serialNumber, ephemeral);
         } catch (RemoteException e) {
             throw e.rethrowFromSystemServer();
         }
     }
 
-    /** {@hide} */
-    public void destroyUserKey(int userId) {
+    /**
+     * Destroys the keys for a user's credential-encrypted (CE) and device-encrypted (DE) storage.
+     * <p>
+     * This evicts the keys from the kernel (if present), which "locks" the corresponding
+     * directories.  Then, this deletes the encrypted keys from flash.  This operates on all the
+     * user's CE and DE keys, for both internal and adoptable storage.
+     * <p>
+     * This does not destroy the CE and DE directories themselves.  For that, see {@link
+     * #destroyUserStorage()}.
+     * <p>
+     * This is only intended to be called by UserManagerService, as part of removing a user.
+     *
+     * @param userId ID of the user
+     * @throws RuntimeException on error.  On error, as many things as possible are still destroyed.
+     * @hide
+     */
+    public void destroyUserStorageKeys(int userId) {
         try {
-            mStorageManager.destroyUserKey(userId);
+            mStorageManager.destroyUserStorageKeys(userId);
         } catch (RemoteException e) {
             throw e.rethrowFromSystemServer();
         }
diff --git a/services/core/java/com/android/server/StorageManagerService.java b/services/core/java/com/android/server/StorageManagerService.java
index fcddc28..61584b7 100644
--- a/services/core/java/com/android/server/StorageManagerService.java
+++ b/services/core/java/com/android/server/StorageManagerService.java
@@ -3208,12 +3208,12 @@
 
     @android.annotation.EnforcePermission(android.Manifest.permission.STORAGE_INTERNAL)
     @Override
-    public void createUserKey(int userId, int serialNumber, boolean ephemeral) {
+    public void createUserStorageKeys(int userId, int serialNumber, boolean ephemeral) {
 
-        super.createUserKey_enforcePermission();
+        super.createUserStorageKeys_enforcePermission();
 
         try {
-            mVold.createUserKey(userId, serialNumber, ephemeral);
+            mVold.createUserStorageKeys(userId, serialNumber, ephemeral);
             // Since the user's CE key was just created, the user's CE storage is now unlocked.
             synchronized (mLock) {
                 mCeUnlockedUsers.append(userId);
@@ -3225,12 +3225,12 @@
 
     @android.annotation.EnforcePermission(android.Manifest.permission.STORAGE_INTERNAL)
     @Override
-    public void destroyUserKey(int userId) {
+    public void destroyUserStorageKeys(int userId) {
 
-        super.destroyUserKey_enforcePermission();
+        super.destroyUserStorageKeys_enforcePermission();
 
         try {
-            mVold.destroyUserKey(userId);
+            mVold.destroyUserStorageKeys(userId);
             // Since the user's CE key was just destroyed, the user's CE storage is now locked.
             synchronized (mLock) {
                 mCeUnlockedUsers.remove(userId);
diff --git a/services/core/java/com/android/server/pm/UserManagerService.java b/services/core/java/com/android/server/pm/UserManagerService.java
index 7e88e13..e5c19f5 100644
--- a/services/core/java/com/android/server/pm/UserManagerService.java
+++ b/services/core/java/com/android/server/pm/UserManagerService.java
@@ -4905,9 +4905,9 @@
                 }
             }
 
-            t.traceBegin("createUserKey");
+            t.traceBegin("createUserStorageKeys");
             final StorageManager storage = mContext.getSystemService(StorageManager.class);
-            storage.createUserKey(userId, userInfo.serialNumber, userInfo.isEphemeral());
+            storage.createUserStorageKeys(userId, userInfo.serialNumber, userInfo.isEphemeral());
             t.traceEnd();
 
             // Only prepare DE storage here.  CE storage will be prepared later, when the user is
@@ -5731,17 +5731,18 @@
     private void removeUserState(final @UserIdInt int userId) {
         Slog.i(LOG_TAG, "Removing user state of user " + userId);
 
-        // Cleanup lock settings.  This must happen before destroyUserKey(), since the user's DE
-        // storage must still be accessible for the lock settings state to be properly cleaned up.
+        // Cleanup lock settings.  This requires that the user's DE storage still be accessible, so
+        // this must happen before destroyUserStorageKeys().
         mLockPatternUtils.removeUser(userId);
 
         // Evict and destroy the user's CE and DE encryption keys.  At this point, the user's CE and
         // DE storage is made inaccessible, except to delete its contents.
         try {
-            mContext.getSystemService(StorageManager.class).destroyUserKey(userId);
+            mContext.getSystemService(StorageManager.class).destroyUserStorageKeys(userId);
         } catch (IllegalStateException e) {
             // This may be simply because the user was partially created.
-            Slog.i(LOG_TAG, "Destroying key for user " + userId + " failed, continuing anyway", e);
+            Slog.i(LOG_TAG, "Destroying storage keys for user " + userId
+                    + " failed, continuing anyway", e);
         }
 
         // Cleanup package manager settings