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aB An HMAC hash object.
Do not instantiate directly. Use the :func:`new` function.
:ivar digest_size: the size in bytes of the resulting MAC tag
:vartype digest_size: integer
:ivar oid: the ASN.1 object ID of the HMAC algorithm.
Only present if the algorithm was officially assigned one.
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E � E �#E8c �< � | j j |� | S )z�Authenticate the next chunk of message.
Args:
data (byte string/byte array/memoryview): The next chunk of data
)r r )r" r$ s r* r z HMAC.updatex s � �
� � ���3� �� r c �j � | j j | j | j ||� }|S )z2Carry out the expensive inner loop for PBKDF2-HMAC)r �_pbkdf2_hmac_assistr r! )r" � first_digest�
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r c � � t d| j �� }| j j � |_ | j j � |_ |S )a+ Return a copy ("clone") of the HMAC object.
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object.
This can be used to efficiently compute the MAC tag of byte
strings that share a common initial substring.
:return: An :class:`HMAC`
s fake key)r% )r
r r �copyr! )r" �new_hmacs r* r3 z HMAC.copy� sC � � � �t���?�� �+�+�*�*�,��� �+�+�*�*�,����r c � � | j j � }|j | j j � � |j � S )z�Return the **binary** (non-printable) MAC tag of the message
authenticated so far.
:return: The MAC tag digest, computed over the data processed so far.
Binary form.
:rtype: byte string
)r! r3 r r r )r" �frozen_outer_hashs r* r z HMAC.digest� sA � � !�K�K� ,� ,� .��� � ����!3�!3�!5�6� �'�'�)�)r c �� � t d� }t j d||�� }t j d|| j � �� }|j � |j � k7 r t d� �y)ah Verify that a given **binary** MAC (computed by another party)
is valid.
Args:
mac_tag (byte string/byte string/memoryview): the expected MAC of the message.
Raises:
ValueError: if the MAC does not match. It means that the message
has been tampered with or that the MAC key is incorrect.
� � )� digest_bitsr# �datazMAC check failedN)r r r r r )r" �mac_tag�secret�mac1�mac2s r* �verifyz HMAC.verify� s] � � "�"�%���{�{�s��W�E���{�{�s��T�[�[�]�K�� �;�;�=�D�K�K�M� )� � /�0� 0� *r c � � dj t | j � � D �cg c] }dt |� z �� c}� S c c}w )z�Return the **printable** MAC tag of the message authenticated so far.
:return: The MAC tag, computed over the data processed so far.
Hexadecimal encoded.
:rtype: string
� z%02x)�join�tupler r )r" �xs r* � hexdigestzHMAC.hexdigest� sD � � �w�w�!&�t�{�{�}�!5�7� � ��a��(� 7� 8� 8�� 7s �Ac �J � | j t t |� � � y)a~ Verify that a given **printable** MAC (computed by another party)
is valid.
Args:
hex_mac_tag (string): the expected MAC of the message,
as a hexadecimal string.
Raises:
ValueError: if the MAC does not match. It means that the message
has been tampered with or that the MAC key is incorrect.
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5r Nc � � t | ||� S )aA Create a new MAC object.
Args:
key (bytes/bytearray/memoryview):
key for the MAC object.
It must be long enough to match the expected security level of the
MAC.
msg (bytes/bytearray/memoryview):
Optional. The very first chunk of the message to authenticate.
It is equivalent to an early call to :meth:`HMAC.update`.
digestmod (module):
The hash to use to implement the HMAC.
Default is :mod:`Cryptodome.Hash.MD5`.
Returns:
An :class:`HMAC` object
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