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Limit md5 import to allow for compatibility with fips environments #1288

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Limit md5 import to allow for compatibility with fips environments #1288

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ddd1621
Mark non-security md5 usage to allow for compatibility with fips
lratc Apr 23, 2026
002bf5c
Style fix in cassandra/metadata.py
lratc May 1, 2026
d77aae4
Only use md5 if it is available
lratc May 1, 2026
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11 changes: 10 additions & 1 deletion cassandra/metadata.py
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Original file line number Diff line number Diff line change
Expand Up @@ -19,7 +19,6 @@
from collections import defaultdict
from collections.abc import Mapping
from functools import total_ordering
from hashlib import md5
import json
import logging
import re
Expand All @@ -28,6 +27,12 @@
import struct
import random

md5 = None
try:
from hashlib import md5
except ImportError as e:
pass

murmur3 = None
try:
from cassandra.murmur3 import murmur3
Expand Down Expand Up @@ -1827,6 +1832,8 @@ def __repr__(self):
class NoMurmur3(Exception):
pass

class NoMD5(Exception):
pass

class HashToken(Token):

Expand Down Expand Up @@ -1862,6 +1869,8 @@ class MD5Token(HashToken):

@classmethod
def hash_fn(cls, key):
if md5 is None:
raise NoMD5()
if isinstance(key, str):
key = key.encode('UTF-8')
return abs(varint_unpack(md5(key).digest()))
Expand Down