o j#@sdZddlmZmZmZmZddlZddlmZm Z m Z ddl m Z m Z ejdkZdZd Zd d Zdd dZddZdddZddZdS)z Functions for parsing and dumping using the ASN.1 DER encoding. Exports the following items: - emit() - parse() - peek() Other type classes are defined that help compose the types listed above. )unicode_literalsdivisionabsolute_importprint_functionN)byte_clschr_cls type_name)int_from_bytes int_to_bytes)zO}||d>O}|dkr9d}|dkr0t||d@B|}|s(d}|d?}|dkst|dB|}n|t||B7}t|}|dkrQ|t|7}|St|}|tdt|B7}||7}|S) a Constructs the header bytes for an ASN.1 object :param class_: An integer ASN.1 class value: 0 (universal), 1 (application), 2 (context), 3 (private) :param method: An integer ASN.1 method value: 0 (primitive), 1 (constructed) :param tag: An integer ASN.1 tag value :param contents: A byte string of the encoded byte contents :return: A byte string of the ASN.1 DER header r(rr-r$r#r&r%r')rrr ) rrrrheaderid_numcont_bitlength length_bytesrrrrs,   r)F)rFr)__doc__ __future__rrrrsys_typesrrr utilr r version_infor0r/r.rr!r"rrrrrrs   1'  j