New hidden API to support the CTS test case that checks the file contents remains unaltered.

Bug: 276402673
Test: atest tests/tests/telephony/current/src/android/telephony/cts/TelephonyManagerTest.java#testCarrierRestrictionStatusAllowList also pformed the sanity and all the basic scenarios are working fine.
Change-Id: I4922b6bf12820e61531782d01dabad55f3b63323

telephony/java/android/telephony/TelephonyManager.java

@@ -13296,6 +13296,29 @@ public class TelephonyManager {
         }
     }
 
+    /**
+     * Test API to verify carrier restriction status allow list i.e.
+     * packages/services/Telephony/assets/CarrierRestrictionOperatorDetails.json.
+     *
+     * @param pkgName : packaga name of the entry to verify
+     * @param carrierId : carrier Id of the entry
+     * @return {@code List<String>} : list of registered shaIds
+     * @hide
+     */
+    @RequiresPermission(android.Manifest.permission.READ_PRIVILEGED_PHONE_STATE)
+    public List<String> getShaIdFromAllowList(String pkgName, int carrierId) {
+        try {
+            ITelephony service = getITelephony();
+            if (service != null) {
+                return service.getShaIdFromAllowList(pkgName, carrierId);
+            }
+        } catch (RemoteException ex) {
+            Rlog.e(TAG, "getShaIdFromAllowList: RemoteException = " + ex);
+            throw ex.rethrowAsRuntimeException();
+        }
+        return Collections.EMPTY_LIST;
+    }
+
     /**
      * Used to enable or disable carrier data by the system based on carrier signalling or
      * carrier privileged apps. Different from {@link #setDataEnabled(boolean)} which is linked to

telephony/java/com/android/internal/telephony/ITelephony.aidl

@@ -3037,4 +3037,11 @@ interface ITelephony {
      * @return {@code true} if the timeout duration is set successfully, {@code false} otherwise.
      */
     boolean setSatelliteDeviceAlignedTimeoutDuration(long timeoutMillis);
+
+    /**
+     * Test method to confirm the file contents are not altered.
+     */
+     @JavaPassthrough(annotation="@android.annotation.RequiresPermission("
+                 + "android.Manifest.permission.READ_PRIVILEGED_PHONE_STATE)")
+     List<String> getShaIdFromAllowList(String pkgName, int carrierId);
 }