Remove HardwareAuthToken parameter from addUserKeyAuth

Due to the migration to synthetic passwords, the 'token' parameter to
addUserKeyAuth() is no longer needed.  Remove it.

Test: atest com.android.server.locksettings
Bug: 184723544
Change-Id: I06e7c36787cc7f384acb7742737c3b1cfa50f0ae

core/java/android/os/storage/IStorageManager.aidl

@@ -179,7 +179,7 @@ interface IStorageManager {
     void prepareUserStorage(in String volumeUuid, int userId, int serialNumber, int flags) = 66;
     void destroyUserStorage(in String volumeUuid, int userId, int flags) = 67;
     boolean isConvertibleToFBE() = 68;
-    void addUserKeyAuth(int userId, int serialNumber, in byte[] token, in byte[] secret) = 70;
+    void addUserKeyAuth(int userId, int serialNumber, in byte[] secret) = 70;
     void fixateNewestUserKeyAuth(int userId) = 71;
     void fstrim(int flags, IVoldTaskListener listener) = 72;
     AppFuseMount mountProxyFileDescriptorBridge() = 73;

services/core/java/com/android/server/StorageManagerService.java

@@ -3470,18 +3470,19 @@ class StorageManagerService extends IStorageManager.Stub
     }
 
     /*
-     * Add this token/secret pair to the set of ways we can recover a disk encryption key.
+     * Add this secret to the set of ways we can recover a user's disk
-     * Changing the token/secret for a disk encryption key is done in two phases: first, adding
+     * encryption key.  Changing the secret for a disk encryption key is done in
-     * a new token/secret pair with this call, then delting all other pairs with
+     * two phases.  First, this method is called to add the new secret binding.
-     * fixateNewestUserKeyAuth. This allows other places where a credential is used, such as
+     * Second, fixateNewestUserKeyAuth is called to delete all other bindings.
-     * Gatekeeper, to be updated between the two calls.
+     * This allows other places where a credential is used, such as Gatekeeper,
+     * to be updated between the two calls.
      */
     @Override
-    public void addUserKeyAuth(int userId, int serialNumber, byte[] token, byte[] secret) {
+    public void addUserKeyAuth(int userId, int serialNumber, byte[] secret) {
         enforcePermission(android.Manifest.permission.STORAGE_INTERNAL);
 
         try {
-            mVold.addUserKeyAuth(userId, serialNumber, encodeBytes(token), encodeBytes(secret));
+            mVold.addUserKeyAuth(userId, serialNumber, encodeBytes(secret));
         } catch (Exception e) {
             Slog.wtf(TAG, e);
         }

services/core/java/com/android/server/locksettings/LockSettingsService.java

@@ -2067,9 +2067,9 @@ public class LockSettingsService extends ILockSettings.Stub {
         mStorage.writeChildProfileLock(userId, outputStream.toByteArray());
     }
 
-    private void setAuthlessUserKeyProtection(int userId, byte[] key) {
+    private void setUserKeyProtection(int userId, byte[] key) {
-        if (DEBUG) Slog.d(TAG, "setAuthlessUserKeyProtectiond: user=" + userId);
+        if (DEBUG) Slog.d(TAG, "setUserKeyProtection: user=" + userId);
-        addUserKeyAuth(userId, null, key);
+        addUserKeyAuth(userId, key);
     }
 
     private void clearUserKeyProtection(int userId, byte[] secret) {
@@ -2120,11 +2120,11 @@ public class LockSettingsService extends ILockSettings.Stub {
         }
     }
 
-    private void addUserKeyAuth(int userId, byte[] token, byte[] secret) {
+    private void addUserKeyAuth(int userId, byte[] secret) {
         final UserInfo userInfo = mUserManager.getUserInfo(userId);
         final long callingId = Binder.clearCallingIdentity();
         try {
-            mStorageManager.addUserKeyAuth(userId, userInfo.serialNumber, token, secret);
+            mStorageManager.addUserKeyAuth(userId, userInfo.serialNumber, secret);
         } catch (RemoteException e) {
             throw new IllegalStateException("Failed to add new key to vold " + userId, e);
         } finally {
@@ -2901,7 +2901,7 @@ public class LockSettingsService extends ILockSettings.Stub {
                 mSpManager.newSidForUser(getGateKeeperService(), auth, userId);
             }
             mSpManager.verifyChallenge(getGateKeeperService(), auth, 0L, userId);
-            setAuthlessUserKeyProtection(userId, auth.deriveDiskEncryptionKey());
+            setUserKeyProtection(userId, auth.deriveDiskEncryptionKey());
             setKeystorePassword(auth.deriveKeyStorePassword(), userId);
         } else {
             clearUserKeyProtection(userId, null);
@@ -3104,7 +3104,7 @@ public class LockSettingsService extends ILockSettings.Stub {
                 // a new SID, and re-add keys to vold and keystore.
                 mSpManager.newSidForUser(getGateKeeperService(), auth, userId);
                 mSpManager.verifyChallenge(getGateKeeperService(), auth, 0L, userId);
-                setAuthlessUserKeyProtection(userId, auth.deriveDiskEncryptionKey());
+                setUserKeyProtection(userId, auth.deriveDiskEncryptionKey());
                 fixateNewestUserKeyAuth(userId);
                 setKeystorePassword(auth.deriveKeyStorePassword(), userId);
             }

services/tests/servicestests/src/com/android/server/locksettings/BaseLockSettingsServiceTests.java

@@ -221,10 +221,10 @@ public abstract class BaseLockSettingsServiceTests {
                 Object[] args = invocation.getArguments();
                 mStorageManager.addUserKeyAuth((int) args[0] /* userId */,
                         (int) args[1] /* serialNumber */,
-                        (byte[]) args[3] /* secret */);
+                        (byte[]) args[2] /* secret */);
                 return null;
             }
-        }).when(sm).addUserKeyAuth(anyInt(), anyInt(), any(), any());
+        }).when(sm).addUserKeyAuth(anyInt(), anyInt(), any());
 
         doAnswer(new Answer<Void>() {
             @Override