code: def new(algname, key, encrypt=True, iv=None):
      
      ciph_type = CipherType(algname)
      return Cipher(ciph_type, key, iv, encrypt)
docs: Returns new cipher object ready to encrypt-decrypt data
  
      @param algname - string algorithm name like in opemssl command
                       line
      @param key - binary string representing ciher key
      @param encrypt - if True (default) cipher would be initialized
                      for encryption, otherwise - for decrypton
      @param iv - initialization vector