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personalization: SUCI: ff-pad remaining file size

Change-Id: I9465eac9269e3f76dddd467109f547489a0feb93
Jenkins: skip-card-test
---
M pySim/esim/saip/personalization.py
1 file changed, 9 insertions(+), 1 deletion(-)

git pull ssh://gerrit.osmocom.org:29418/pysim refs/changes/66/43866/1

diff --git a/pySim/esim/saip/personalization.py b/pySim/esim/saip/personalization.py
index a81c61f..a3347cb 100644
--- a/pySim/esim/saip/personalization.py
+++ b/pySim/esim/saip/personalization.py
@@ -1334,7 +1334,15 @@
             if not f_sucici:
                 continue
             ef_sucici = EF_SUCI_Calc_Info()
-            f_sucici.body = ef_sucici.encode_bin(val)
+            body = ef_sucici.encode_bin(val)
+
+            # 0xff pad up to the existing file size, so that the underlying template doesn't come through
+            is_size = f_sucici.file_size
+            pad_n = is_size - len(body)
+            if pad_n > 0:
+                body = body + b'\xff' * pad_n
+
+            f_sucici.body = body
             pe.file2pe(f_sucici)
 
     @classmethod

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