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:ivar digest_size: the size in bytes of the resulting MAC tag
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� A:C �C c �: � | j � |� � | S )z�Authenticate the next chunk of message.
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c � � t d| j �� � }| j � � � |_ | j � � � |_ |S )a+ Return a copy ("clone") of the HMAC object.
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object.
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strings that share a common initial substring.
:return: An :class:`HMAC`
s fake key)r! )r r r �copyr )r �new_hmacs r& r/ z HMAC.copys sI � � � �t��?�?�?�� �+�*�*�,�,��� �+�*�*�,�,����r
c � � | j � � � }|� | j � � � � � |� � � S )z�Return the **binary** (non-printable) MAC tag of the message
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)r r/ r r r )r �frozen_outer_hashs r& r z HMAC.digest� sL � � !�K� ,� ,� .� .��� � ���!3�!3�!5�!5�6�6�6� �'�'�)�)�)r
c � � t d� � }t j d||�� � }t j d|| � � � �� � }|� � � |� � � k rt d� � �dS )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.
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c �~ � d� d� t | � � � � � D � � � � S )z�Return the **printable** MAC tag of the message authenticated so far.
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c �d � | � t t |� � � � � � dS )a~ Verify that a given **printable** MAC (computed by another party)
is valid.
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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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Nc �$ � t | ||� � S )a= 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:`Crypto.Hash.MD5`.
Returns:
An :class:`HMAC` object
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