I'm having an issue updating the user and passowrd for one of our 
repositories via the admin page.  When I enter the info and hit save, I get 
the following error:

2017-08-28 17:49:57,696 - ERROR - None - 8888888 - 
/admin/db/scmtools/repository/1/ - djblets.log.middleware - Exception 
thrown for user 888888 at http://88888888/admin/db/scmtools/repository/1/

cipher AES in CFB8 mode is not supported by this backend.
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/django/core/handlers/base.py", 
line 112, in get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/usr/lib/python2.7/site-packages/django/contrib/admin/options.py", 
line 465, in wrapper
    return self.admin_site.admin_view(view)(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/django/utils/decorators.py", line 
99, in _wrapped_view
    response = view_func(request, *args, **kwargs)
  File "/usr/lib/python2.7/site-packages/django/views/decorators/cache.py", 
line 52, in _wrapped_view_func
    response = view_func(request, *args, **kwargs)
  File "/usr/lib/python2.7/site-packages/django/contrib/admin/sites.py", 
line 198, in inner
    return view(request, *args, **kwargs)
  File "/usr/lib/python2.7/site-packages/django/utils/decorators.py", line 
29, in _wrapper
    return bound_func(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/django/utils/decorators.py", line 
99, in _wrapped_view
    response = view_func(request, *args, **kwargs)
  File "/usr/lib/python2.7/site-packages/django/utils/decorators.py", line 
25, in bound_func
    return func(self, *args2, **kwargs2)
  File "/usr/lib/python2.7/site-packages/django/db/transaction.py", line 
371, in inner
    return func(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/django/contrib/admin/options.py", 
line 1246, in change_view
    new_object = self.save_form(request, form, change=True)
  File "/usr/lib/python2.7/site-packages/django/contrib/admin/options.py", 
line 887, in save_form
    return form.save(commit=False)
  File "/usr/lib/python2.7/site-packages/reviewboard/scmtools/forms.py", 
line 1181, in save
    repository.password = self.cleaned_data['password'] or ''
  File "/usr/lib/python2.7/site-packages/reviewboard/scmtools/models.py", 
line 192, in _set_password
    encrypt_password(value.encode('utf-8')))
  File 
"/usr/lib/python2.7/site-packages/reviewboard/scmtools/crypto_utils.py", 
line 150, in encrypt_password
    return base64.b64encode(aes_encrypt(password, key=key))
  File 
"/usr/lib/python2.7/site-packages/reviewboard/scmtools/crypto_utils.py", 
line 88, in aes_encrypt
    encryptor = cipher.encryptor()
  File 
"/usr/lib64/python2.7/site-packages/cryptography/hazmat/primitives/ciphers/base.py",
 
line 104, in encryptor
    self.algorithm, self.mode
  File 
"/usr/lib64/python2.7/site-packages/cryptography/hazmat/backends/multibackend.py",
 
line 53, in create_symmetric_encryption_ctx
    _Reasons.UNSUPPORTED_CIPHER
UnsupportedAlgorithm: cipher AES in CFB8 mode is not supported by this 
backend.


I'm running on RHEL 7.

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