Added django.db.backends.utils.names_digest() to remove redundant code.

1 files changed, 12 insertions, 1 deletions

diff --git a/django/db/backends/utils.py b/django/db/backends/utils.py
index a762175025..2062af91f1 100644
--- a/django/db/backends/utils.py
+++ b/django/db/backends/utils.py
@@ -213,10 +213,21 @@ def truncate_name(identifier, length=None, hash_len=4):
     if length is None or len(name) <= length:
         return identifier
 
-    digest = hashlib.md5(name.encode()).hexdigest()[:hash_len]
+    digest = names_digest(name, length=hash_len)
     return '%s%s%s' % ('%s"."' % namespace if namespace else '', name[:length - hash_len], digest)
 
 
+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()
+    for arg in args:
+        h.update(arg.encode())
+    return h.hexdigest()[:length]
+
+
 def format_number(value, max_digits, decimal_places):
     """
     Format a number into a string with the requisite number of digits and