Django UnicodeDecodeError at /admin/login/

I try to implement this hasher in order to be able to authenticate user who are imported from drupal 7. 

So I put the hasher in the settings.py as follows:

PASSWORD_HASHERS = (
   
    'myproj.drupal_hasher.DrupalPasswordHasher', #drupal hasher
     
    'django.contrib.auth.hashers.PBKDF2SHA1PasswordHasher',
   
    'django.contrib.auth.hashers.BCryptPasswordHasher',
    'django.contrib.auth.hashers.SHA1PasswordHasher',
    'django.contrib.auth.hashers.MD5PasswordHasher',
    'django.contrib.auth.hashers.CryptPasswordHasher',
     )

However it does not authenticate imported users from drupal and for users who are created in Django I get:

    'ascii' codec can't decode byte 0xcf in position 0: ordinal not in range(128)

Here is the trackback:


    Environment:
   
   
    Request Method: POST
    Request URL: http://127.0.0.1:8000/auth/
   
    Django Version: 1.7.3
    Python Version: 2.7.3
    Installed Applications:
    ('django.contrib.admin',
     'django.contrib.auth',
     'django.contrib.contenttypes',
     'django.contrib.sessions',
     'django.contrib.messages',
     'django.contrib.staticfiles',
     'article',
     'photo',
     'debug_toolbar',
     'django_markdown',
     'haystack')
    Installed Middleware:
    (u'debug_toolbar.middleware.DebugToolbarMiddleware',
     'django.contrib.sessions.middleware.SessionMiddleware',
     'django.middleware.common.CommonMiddleware',
     'django.middleware.csrf.CsrfViewMiddleware',
     'django.contrib.auth.middleware.AuthenticationMiddleware',
     'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
     'django.contrib.messages.middleware.MessageMiddleware',
     'django.middleware.clickjacking.XFrameOptionsMiddleware')
   
   
    Traceback:
    File "/home/mario/.myprojenv/local/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
      111.                     response = wrapped_callback(request, *callback_args, **callback_kwargs)
    File "/home/mario/myproj/myauth/views.py" in auth_view
      16.     user = auth.authenticate(username=username, password=password)
    File "/home/mario/.myprojenv/local/lib/python2.7/site-packages/django/contrib/auth/__init__.py" in authenticate
      60.             user = backend.authenticate(**credentials)
    File "/home/mario/.myprojenv/local/lib/python2.7/site-packages/django/contrib/auth/backends.py" in authenticate
      17.             if user.check_password(password):
    File "/home/mario/.myprojenv/local/lib/python2.7/site-packages/django/contrib/auth/models.py" in check_password
      237.         return check_password(raw_password, self.password, setter)
    File "/home/mario/.myprojenv/local/lib/python2.7/site-packages/django/contrib/auth/hashers.py" in check_password
      63.         setter(password)
    File "/home/mario/.myprojenv/local/lib/python2.7/site-packages/django/contrib/auth/models.py" in setter
      235.             self.set_password(raw_password)
    File "/home/mario/.myprojenv/local/lib/python2.7/site-packages/django/contrib/auth/models.py" in set_password
      227.         self.password = make_password(raw_password)
    File "/home/mario/.myprojenv/local/lib/python2.7/site-packages/django/contrib/auth/hashers.py" in make_password
      85.     return hasher.encode(password, salt)
    File "/home/mario/myproj/myproj/drupal_hasher.py" in encode
      81.         encoded_hash = self._apply_hash(password, self._digests[digest], settings)
    File "/home/mario/myproj/myproj/drupal_hasher.py" in _apply_hash
      68.             password_hash = digest(password_hash + password).digest()
   
    Exception Type: UnicodeDecodeError at /auth/
    Exception Value: 'ascii' codec can't decode byte 0xcf in position 0: ordinal not in range(128)

All source and destination database tables are converted to utf8_unicode_ci.

I am stock on this problem for days so really appreciate your help. 

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