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DerInteger�DerOctetString�DerNull� DerSequence� DerObjectIdc @ s^ e Zd ZdZddddddd�Zd ed
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ddd�Z d S )r z�Base class for defining a single DER object.
Instantiate this class ONLY when you have to decode a DER element.
�0 � � � � � )�SEQUENCEz
BIT STRING�INTEGERz OCTET STRING�NULLzOBJECT IDENTIFIERN� c C sH t |�s|dkr|| _n&t|�dkr0t|�| _n| j�|�| _|| _dS )z�Initialize the DER object according to a specific type.
The ASN.1 type is either specified as the ASN.1 string (e.g.
'SEQUENCE'), directly with its numerical tag or with no tag
at all (None).N� )�isInt�typeTag�len�ord�typeTags�get�payload)�self�ASN1Typer � r �C/opt/alt/python37/lib64/python3.7/site-packages/Crypto/Util/asn1.py�__init__' s zDerObject.__init__c C s | j | | jkS )N)r r )r r r r r �isType6 s zDerObject.isTypec C s, |dkr$t |�}tt|�d �| S t|�S )z�Return a byte string that encodes the given payload length (in
bytes) in a format suitable for a DER length tag (L).
� � )r �bchrr )r Z
payloadLen�encodingr r r �
_lengthOctets9 s zDerObject._lengthOctetsc C s t | j�| �t| j�� | j S )z6Return a complete DER element, fully encoded as a TLV.)r% r r' r r )r r r r �encodeB s zDerObject.encodec C sd t || �}|dkr ||d fS t||d |d |d@ � �}|dkrPtd��||d |d@ fS )a� Given a (part of a) DER element, and an index to the first byte of
a DER length tag (L), return a tuple with the payload size,
and the index of the first byte of the such payload (V).
Raises a ValueError exception if the DER length is invalid.
Raises an IndexError exception if the DER element is too short.
r# r zNot a DER length tag.)�bordr �
ValueError)r �idxZder�lengthZ
payloadLengthr r r �
_decodeLenF s zDerObject._decodeLenr c C s� yft |d �| _| jd@ dkr&td��| �d|�\}}|rRt|�|| krRtd��|||| � | _W n tk
r� td��Y nX || S )a� Decode a complete DER element, and re-initializes this
object with it.
@param derEle A complete DER element. It must start with a DER T
tag.
@param noLeftOvers Indicate whether it is acceptable to complete the
parsing of the DER element and find that not all
bytes in derEle have been used.
@return Index of the first unused byte in the given DER element.
Raises a ValueError exception in case of parsing errors.
Raises an IndexError exception if the DER element is too short.
r � zUnsupported DER tagr zNot a DER structurezNot a valid DER SEQUENCE.)r) r r* r- r r �
IndexError)r �derEle� noLeftOversr, r+ r r r �decodeV s zDerObject.decode)r ) �__name__�
__module__� __qualname__�__doc__r �br! r" r' r( r- r2 r r r r r s c @ s( e Zd Zd dd�Zdd� Zd
dd�ZdS ) r r c C s t �| d� || _dS )z|Class to model an INTEGER DER element.
Limitation: only non-negative values are supported.
r N)r r! �value)r r8 r r r r! q s zDerInteger.__init__c C s8 t | j�| _t| jd �dkr.td�| j | _t�| �S )z>Return a complete INTEGER DER element, fully encoded as a TLV.r r# )r r8 r r) r% r r( )r r r r r( y s zDerInteger.encodec C sP t �| ||�}| j| jd kr&td��t| jd �dkr@td��t| j�| _|S )a Decode a complete INTEGER DER element, and re-initializes this
object with it.
@param derEle A complete INTEGER DER element. It must start with a DER
INTEGER tag.
@param noLeftOvers Indicate whether it is acceptable to complete the
parsing of the DER element and find that not all
bytes in derEle have been used.
@return Index of the first unused byte in the given DER element.
Raises a ValueError exception if the DER element is not a
valid non-negative INTEGER.
Raises an IndexError exception if the DER element is too short.
r zNot a DER INTEGER.r r# zNegative INTEGER.) r r2 r r r* r) r r r8 )r r0 r1 � tlvLengthr r r r2 � s zDerInteger.decodeN)r )r )r3 r4 r5 r! r( r2 r r r r r p s
c @ s| e Zd ZdZd dd�Zdd� Zdd� Zd d
� Zd d � Zd
d� Z dd� Z
dd� Z dd� Z dd� Z
dd� Zdd� Zd d d �ZdS ) r a Class to model a SEQUENCE DER element.
This object behave like a dynamic Python sequence.
Sub-elements that are INTEGERs, look like Python integers.
Any other sub-element is a binary string encoded as the complete DER
sub-element (TLV).
Nc C s& t �| d� |dkr g | _n|| _dS )zKInitialize the SEQUENCE DER object. Always empty
initially.r N)r r! �_seq)r ZstartSeqr r r r! � s zDerSequence.__init__c C s | j |= d S )N)r: )r �nr r r � __delitem__� s zDerSequence.__delitem__c C s
| j | S )N)r: )r r; r r r � __getitem__� s zDerSequence.__getitem__c C s || j |< d S )N)r: )r �keyr8 r r r � __setitem__� s zDerSequence.__setitem__c C s || j ||�< d S )N)r: )r �i�jZsequencer r r � __setslice__� s zDerSequence.__setslice__c C s | j ||�= d S )N)r: )r r@ rA r r r � __delslice__� s zDerSequence.__delslice__c C s | j td|�td|�� S )Nr )r: �max)r r@ rA r r r � __getslice__� s zDerSequence.__getslice__c C s
t | j�S )N)r r: )r r r r �__len__� s zDerSequence.__len__c C s | j �|�S )N)r: �append)r �itemr r r rG � s zDerSequence.appendc C s t ttt| j���S )z=Return the number of items in this sequence that are numbers.)r �list�filterr r: )r r r r �hasInts� s zDerSequence.hasIntsc C s | j o| �� t| j �kS )z6Return True if all items in this sequence are numbers.)r: rK r )r r r r � hasOnlyInts� s zDerSequence.hasOnlyIntsc
C st t d�| _x^| jD ]T}y| j|7 _W q y| jt|��� 7 _W n td��Y nX Y qX qW t�| �S )a; Return the DER encoding for the ASN.1 SEQUENCE, containing
the non-negative integers and longs added to this object.
Limitation: Raises a ValueError exception if it some elements
in the sequence are neither Python integers nor complete DER INTEGERs.
r z&Trying to DER encode an unknown object)r7 r r: r r( r* r )r rH r r r r( � s
zDerSequence.encoder c C s� g | _ y�t�| ||�}| j| jd kr.td��d}x�|t| j�k r�t| j| �}|| jd kr�t � }||�| j|d� �7 }| j �
|j � q4| � |d | j�\}}| j �
| j||| � � || }q4W W n t
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r� td��Y nX |S )a� Decode a complete SEQUENCE DER element, and re-initializes this
object with it.
@param derEle A complete SEQUENCE DER element. It must start with a DER
SEQUENCE tag.
@param noLeftOvers Indicate whether it is acceptable to complete the
parsing of the DER element and find that not all
bytes in derEle have been used.
@return Index of the first unused byte in the given DER element.
DER INTEGERs are decoded into Python integers. Any other DER
element is not decoded. Its validity is not checked.
Raises a ValueError exception if the DER element is not a
valid DER SEQUENCE.
Raises an IndexError exception if the DER element is too short.
r zNot a DER SEQUENCE.r r Nr zNot a valid DER SEQUENCE.)r: r r2 r r r* r r r) r rG r8 r- r/ ) r r0 r1 r9 r+ r Z
newIntegerZitemLenZitemIdxr r r r2 � s$ zDerSequence.decode)N)r )r3 r4 r5 r6 r! r< r= r? rB rC rE rF rG rK rL r( r2 r r r r r � s
c @ s& e Zd Zed�fdd�Zddd�ZdS ) r r c C s t �| d� || _d S )Nz OCTET STRING)r r! r )r r8 r r r r! � s zDerOctetString.__init__r c C s" t �||�}| �d�s td��|S )Nz OCTET STRINGzNot a valid OCTET STRING.)r r2 r" r* )r r0 r1 �pr r r r2 s
zDerOctetString.decodeN)r )r3 r4 r5 r7 r! r2 r r r r r � s c @ s e Zd Zdd� ZdS )r c C s t �| d� d S )Nr )r r! )r r r r r!
s zDerNull.__init__N)r3 r4 r5 r! r r r r r s c @ s e Zd Zdd� Zddd�ZdS )r
c C s t �| d� d S )NzOBJECT IDENTIFIER)r r! )r r r r r! s zDerObjectId.__init__r c C s" t �||�}| �d�s td��|S )NzOBJECT IDENTIFIERz Not a valid OBJECT IDENTIFIER.)r r2 r" r* )r r0 r1 rM r r r r2 s
zDerObjectId.decodeN)r )r3 r4 r5 r! r2 r r r r r
s c C s* d}y || 7 }W n t k
r$ dS X dS )Nr r )� TypeError)�x�testr r r r s r )
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