Fixed #28401 -- Allowed hashlib.md5() calls to work with FIPS kernels.

md5 is not an approved algorithm in FIPS mode, and trying to instantiate
a hashlib.md5() will fail when the system is running in FIPS mode.

md5 is allowed when in a non-security context. There is a plan to add a
keyword parameter (usedforsecurity) to hashlib.md5() to annotate whether
or not the instance is being used in a security context.

In the case where it is not, the instantiation of md5 will be allowed.
See https://bugs.python.org/issue9216 for more details.

Some downstream python versions already support this parameter. To
support these versions, a new encapsulation of md5() has been added.
This encapsulation will pass through the usedforsecurity parameter in
the case where the parameter is supported, and strip it if it is not.

Co-authored-by: Mariusz Felisiak <felisiak.mariusz@gmail.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/django/db/backends/utils.py b/django/db/backends/utils.py
index c342cf79b5..eda7159a41 100644
--- a/django/db/backends/utils.py
+++ b/django/db/backends/utils.py
@@ -1,12 +1,12 @@
 import datetime
 import decimal
 import functools
-import hashlib
 import logging
 import time
 from contextlib import contextmanager
 
 from django.db import NotSupportedError
+from django.utils.crypto import md5
 
 logger = logging.getLogger('django.db.backends')
 
@@ -216,7 +216,7 @@ def names_digest(*args, length):
     Generate a 32-bit digest of a set of arguments that can be used to shorten
     identifying names.
     """
-    h = hashlib.md5()
+    h = md5(usedforsecurity=False)
     for arg in args:
         h.update(arg.encode())
     return h.hexdigest()[:length]