code: def validate(self, auth_rest):
          
          try:
              auth_salt, auth_hash = auth_rest.split('$')
          except ValueError:
              raise ValueError("Missing '$' in %s" % auth_rest)
  
          if len(auth_salt) == 0:
              raise ValueError("Salt must have non-zero length!")
          if len(auth_hash) != 40:
              raise ValueError("Hash must have 40 chars!")
          if not all(c in string.hexdigits for c in auth_hash):
              raise ValueError("Hash must be hexadecimal!")
  
          return dict(salt=auth_salt, hash=auth_hash)
docs: Validate user credentials whether format is right for Sha1
  
          :param auth_rest: User credentials' part without auth_type
          :return: Dict with a hash and a salt part of user credentials
          :raises ValueError: If credentials' part doesn't contain delimiter
                              between a salt and a hash.