o qh#@sdZddlmZmZmZmZddlZddlmZm Z m Z ddl m Z m Z ejdkZdZd d Zdd d ZddZdddZddZdS)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}|dkr;|t|dB7}|dkr:|dkr&dnd}|t||d@B7}|d?}|dks n|t||B7}t|}|dkrS|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_numcontinuation_bitlength length_bytesrrrrs*   r)F)rF)__doc__ __future__rrrrsys_typesrrr utilr r version_infor-r,rr r!rrrrrrs   1'  j