KeyStore: add API to query storage type

Add an API to keystore daemon to query what kind of storage is currently
in use.

(cherry picked from commit a738e2a1aee26e0be3944c11820724aeca313f83)

Change-Id: I52c84449a27b1cefc49372a6406b7132c2bbddee

1 files changed, 9 insertions, 0 deletions

diff --git a/keystore/java/android/security/KeyStore.java b/keystore/java/android/security/KeyStore.java
index 12c0ed8..2037472 100644
--- a/keystore/java/android/security/KeyStore.java
+++ b/keystore/java/android/security/KeyStore.java
@@ -296,6 +296,15 @@ public class KeyStore {
         }
     }
 
+    public boolean isHardwareBacked() {
+        try {
+            return mBinder.is_hardware_backed() == NO_ERROR;
+        } catch (RemoteException e) {
+            Log.w(TAG, "Cannot connect to keystore", e);
+            return false;
+        }
+    }
+
     public int getLastError() {
         return mError;
     }