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� ��'j�# � � � d Z ddlmZmZmZmZ ddlZddlmZm Z m Z ddlmZm Z ej dk ZdZd Zd � Zdd�Zd� Zdd �Zd� Zy)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_literals�division�absolute_import�print_functionN� )�byte_cls�chr_cls� type_name)�int_from_bytes�int_to_bytes)� z<Insufficient data - %s bytes requested but only %s available� c �� � t | t � st dt | � z � �| dk s| dkD rt d| z � �t |t � st dt |� z � �|dk s|dkD rt d|z � �t |t � st dt |� z � �|dk rt d |z � �t |t � st d t |� z � �t | |||� |z S )a� Constructs a byte string of an ASN.1 DER-encoded value This is typically not useful. Instead, use one of the standard classes from asn1crypto.core, or construct a new class with specific fields, and call the .dump() method. :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 value (header and contents) z!class_ must be an integer, not %sr r z*class_ must be one of 0, 1, 2 or 3, not %sz!method must be an integer, not %sr zmethod must be 0 or 1, not %sztag must be an integer, not %sz%tag must be greater than zero, not %s�&contents must be a byte string, not %s)� isinstance�int� TypeErrorr � ValueErrorr �_dump_header)�class_�method�tag�contentss �B/opt/nydus/tmp/pip-target-k0fmikie/lib/python/asn1crypto/parser.py�emitr s� � �2 �f�c�"��;�i��>O�O�P�P� ��z�V�a�Z��E��N�O�O��f�c�"��;�i��>O�O�P�P� ��z�V�a�Z��8�6�A�B�B��c�3���8�9�S�>�I�J�J� �Q�w��@�3�F�G�G��h��)��@�9�X�CV�V�W�W�����X�6��A�A� c � � t | t � st dt | � z � �t | � }t | |� \ }}|r||k7 rt d||z z � �|S )al Parses a byte string of ASN.1 BER/DER-encoded data. This is typically not useful. Instead, use one of the standard classes from asn1crypto.core, or construct a new class with specific fields, and call the .load() class method. :param contents: A byte string of BER/DER-encoded data :param strict: A boolean indicating if trailing data should be forbidden - if so, a ValueError will be raised when trailing data exists :raises: ValueError - when the contents do not contain an ASN.1 header or are truncated in some way TypeError - when contents is not a byte string :return: A 6-element tuple: - 0: integer class (0 to 3) - 1: integer method - 2: integer tag - 3: byte string header - 4: byte string content - 5: byte string trailer r z4Extra data - %d bytes of trailing data were provided)r r r r �len�_parser )r �strict�contents_len�info�consumeds r �parser$ K sd � �: �h��)��@�9�X�CV�V�W�W��x�=�L��H�l�3�N�D�(� �(�l�*��O�S_�bj�Sj�k�l�l��Kr c � � t | t � st dt | � z � �t | t | � � \ }}|S )aW Parses a byte string of ASN.1 BER/DER-encoded data to find the length This is typically used to look into an encoded value to see how long the next chunk of ASN.1-encoded data is. Primarily it is useful when a value is a concatenation of multiple values. :param contents: A byte string of BER/DER-encoded data :raises: ValueError - when the contents do not contain an ASN.1 header or are truncated in some way TypeError - when contents is not a byte string :return: An integer with the number of bytes occupied by the ASN.1 value r )r r r r r r )r r"