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U �e�]U � @ s� d dl mZmZmZ d dlZd dlmZmZ dZdZ dZ dZ dZ d Z d Zd eB Zd eB Zd ZdZdZG dd� de�Zdd� Zdd� ZdS )� )�absolute_import�division�print_functionN)�int_from_bytes� int_to_bytes� � � � � � � � � � � � c @ sl e Zd Zdd� Zdd� Zdd� Zdd� Zd d � Zd d � Zd d� Z dd� Z dd� Z dd� Z dd� Z dd� ZdS )� DERReaderc C s t |�| _d S �N)� memoryview�data)�selfr � r �:/usr/lib/python3/dist-packages/cryptography/hazmat/_der.py�__init__$ s zDERReader.__init__c C s | S r r �r r r r � __enter__' s zDERReader.__enter__c C s |d kr| � � d S r )� check_empty)r �exc_type� exc_value�tbr r r �__exit__* s zDERReader.__exit__c C s t | j�dkS �Nr )�lenr r r r r �is_empty. s zDERReader.is_emptyc C s | � � std��d S )Nz Invalid DER input: trailing data)r$ � ValueErrorr r r r r 1 s zDERReader.check_emptyc C s8 t | j�dk rtd��t�| jd�}| jdd � | _|S )N� �$Invalid DER input: insufficient datar )r# r r% �six� indexbytes)r �retr r r � read_byte5 s zDERReader.read_bytec C s8 t | j�|k rtd��| jd |� }| j|d � | _|S )Nr' )r# r r% )r �nr* r r r � read_bytes< s zDERReader.read_bytesc C s� | � � }|d@ dkr td��| � � }|d@ dkr6|}n^|dM }|dkrNtd��d}t|�D ](}|dK }|| � � O }|dkrZtd��qZ|dk r�td��| �|�}|t|�fS ) N� z-Invalid DER input: unexpected high tag numberr r � z?Invalid DER input: indefinite length form is not allowed in DER� z3Invalid DER input: length was not minimally-encoded)r+ r% �ranger- r )r �tagZ length_byte�length�i�bodyr r r �read_any_elementC s2 � �� zDERReader.read_any_elementc C s | � � \}}||kr td��|S )Nz!Invalid DER input: unexpected tag)r6 r% )r � expected_tagr2 r5 r r r � read_elementg s zDERReader.read_elementc C s& | � | � |�W 5 Q R � S Q R X d S r )r8 �r r7 r r r �read_single_elementm s z DERReader.read_single_elementc C s. t | j�dkr*t�| jd�|kr*| �|�S d S r" )r# r r( r) r8 r9 r r r �read_optional_elementq s z DERReader.read_optional_elementc C s| t | j�dkrtd��t�| jd�}|d@ dkr8td��t | j�dkrpt�| jd�}|dkrp|d@ dkrptd��t| jd�S )Nr z)Invalid DER input: empty integer contentsr z'Negative DER integers are not supportedr& z0Invalid DER input: integer not minimally-encodedZbig)r# r r% r( r) r )r �first�secondr r r � as_integerv s �zDERReader.as_integerN)�__name__� __module__� __qualname__r r r! r$ r r+ r- r6 r8 r: r; r> r r r r r # s $r c C s> t | tj�std��| dk r$td��| �� d d }t| |�S )NzValue must be an integerr z#Negative integers are not supportedr0 r& )� isinstancer( Z integer_typesr% � bit_lengthr )�xr, r r r �encode_der_integer� s rE c G s~ d}|D ]}|t |�7 }qt�| �g}|dk r@|�t�|�� n*t|�}|�t�dt |�B �� |�|� |�|� d�|�S )Nr r � )r# r( Zint2byte�appendr �extend�join)r2 Zchildrenr3 ZchildZchunksZ length_bytesr r r � encode_der� s rJ )Z __future__r r r r( Zcryptography.utilsr r Z CONSTRUCTEDZCONTEXT_SPECIFICZINTEGERZ BIT_STRINGZ OCTET_STRINGZNULLZOBJECT_IDENTIFIERZSEQUENCEZSETZPRINTABLE_STRINGZUTC_TIMEZGENERALIZED_TIME�objectr rE rJ r r r r �<module> s" d
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