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3 y��Y�# � @ s� d Z ddlmZmZmZmZ ddlZddlmZm Z m Z ddlmZm Z ejdkZdZd d � Zddd �Zdd� Zddd�Zdd� ZdS )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 availablec C s� t | t�stdt| � ��| dk s*| dkr6td| ��t |t�sPtdt|� ��|dk s`|dkrltd| ��t |t�s�tdt|� ��|dk r�td | ��t |t�s�td t|� ��t| |||�| 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 %sz&contents must be a byte string, not %s)� isinstance�int� TypeErrorr � ValueErrorr �_dump_header)�class_�method�tag�contents� r �/usr/lib/python3.6/parser.py�emit s r Fc C sP t | t�stdt| � ��t| �}t| |�\}}|rL||krLtd|| ��|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 z&contents must be a byte string, not %sz4Extra data - %d bytes of trailing data were provided)r r r r �len�_parser )r �strictZcontents_len�info�consumedr r r �parseJ s r c C s0 t | t�stdt| � ��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 z&contents must be a byte string, not %s)r r r r r r )r r r r r r �peekq s r c C s4 ||d k r t td|| f ��|}tr4t| | �n| | }|d7 }|d@ }|dkr�d}xFtrjt| | �n| | }|d7 }|d9 }||d@ 7 }|d? dkrZP qZW tr�t| | �n| | }|d7 }|d? dkr�|r�|||d@ fS ||d@ } n�|d@ } | �r0|| 7 }|t| || |� dd � } |�r�|| fS n�|} |d k�rF| d7 } xF| |k �r�t| || dd�\}} | |k�rH| | d | � d k�rHP �qHW |�r�|| fS | |k�r�t t| |f ��|d? |d? d@ || ||� | || d � d f| fS | |k�rt t| |f ��|d? |d? d@ || ||� | || � df| fS )a� Parses a byte string into component parts :param encoded_data: A byte string that contains BER-encoded data :param data_len: The integer length of the encoded data :param pointer: The index in the byte string to parse from :param lengths_only: A boolean to cause the call to return a 2-element tuple of the integer number of bytes in the header and the integer number of bytes in the contents. Internal use only. :return: A 2-element tuple: - 0: A tuple of (class_, method, tag, header, content, trailer) - 1: An integer indicating how many bytes were consumed � r � r � � � F)Zsignedr T)�lengths_onlys � � � )r �_INSUFFICIENT_DATA_MESSAGE�_PY2�ordr r )Zencoded_dataZdata_lenZpointerr% �startZfirst_octetr ZnumZlength_octetZcontents_endZ length_octetsZsub_header_endr r r r � sl r c C s� d}d}|| d>