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python-twisted-core experiences some failures in fips mode due to usage of md5:
- twisted/persisted/sob.py - md5 is used to create hash of password, this hash is then encrypted using AES
- twisted/internet/_sslverify.py - md5 is used to create signature of ssl certificate - this seems to be dangerous and should fail
- twisted/cred/credentials.py - md5 is used to "unique string that can be returned to us and verified" which seems dangerous to do, this should fail or be replaced by different hash function
- twisted/protocols/sip.py - this is obsolete implementation of the above and experiences the same problems
- twisted/spread/respond.py - md5 used for password hashing, should be replaced or left raising the error

As per the original bug report, the mentioned functions should be failing in FIPS mode, so I'm closing this bug as wontfix.