code: def _configure_context(ctx, opts, skip=()):
          
  
          for oper in opts:
              if oper in skip:
                  continue
              if isinstance(oper,chartype):
                  op = oper.encode("ascii")
              else:
                  op = oper
              if isinstance(opts[oper],chartype):
                  value = opts[oper].encode("ascii")
              elif isinstance(opts[oper],bintype):
                  value = opts[oper]
              else:
                  if pyver == 2:
                      value = str(opts[oper])
                  else:
                      value = str(opts[oper]).encode('ascii')
              ret = libcrypto.EVP_PKEY_CTX_ctrl_str(ctx, op, value)
              if ret == -2:
                  raise PKeyError("Parameter %s is not supported by key" % oper)
              if ret < 1:
                  raise PKeyError("Error setting parameter %s" % oper)
docs: Configures context of public key operations
          @param ctx - context to configure
          @param opts - dictionary of options (from kwargs of calling
              function)
          @param skip - list of options which shouldn't be passed to
              context