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param_source: use secrets.SystemRandom as secure random nr source

secrets.SystemRandom is defined as the most secure random source
available on the given operating system.

Change-Id: I8049cd1292674b3ced82b0926569128535af6efe
Jenkins: skip-card-test
---
M pySim/esim/saip/param_source.py
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/pySim/esim/saip/param_source.py b/pySim/esim/saip/param_source.py
index d3c98a6..7caf848 100644
--- a/pySim/esim/saip/param_source.py
+++ b/pySim/esim/saip/param_source.py
@@ -17,7 +17,7 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-import random
+import secrets
 import re
 from osmocom.utils import b2h
 
@@ -124,7 +124,7 @@
         return "%0*d" % (self.num_digits, val)  # pylint: disable=consider-using-f-string
 
 class RandomSourceMixin:
-    random_impl = random.SystemRandom()
+    random_impl = secrets.SystemRandom()
 
 class RandomDigitSource(DecimalRangeSource, RandomSourceMixin):
     """return a different sequence of random decimal digits each"""

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