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� ZdS )zxHMAC (Keyed-Hashing for Message Authentication) Python module.
Implements the HMAC algorithm as described by RFC 2104.
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dd� Zdd� ZdS )�HMACz~RFC 2104 HMAC class.  Also complies with RFC 4231.
    This supports the API for Cryptographic Hash Functions (PEP 247).
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�}| j�|�t�� | j�|�t�� |dk	�rR| �|� dS )aB  Create a new HMAC object.
        key:       key for the keyed hash object.
        msg:       Initial input for the hash, if provided.
        digestmod: A module supporting PEP 247.  *OR*
                   A hashlib constructor returning a new hash object. *OR*
                   A hash name suitable for hashlib.new().
                   Defaults to hashlib.md5.
                   Implicit default to hashlib.md5 is deprecated since Python
                   3.4 and will be removed in Python 3.8.
        Note: key and msg must be a bytes or bytearray objects.
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block_size�   z:block_size of %d seems too small; using our default of %d.z<No block_size attribute on given digest object; Assuming %d.�    )r   )r   )�
isinstance�bytes�	bytearray�	TypeError�type�__name__�	_warnings�warn�DeprecationWarningr   Zmd5�callable�digest_cons�str�outer�inner�digest_size�hasattrr   �	blocksize�RuntimeWarning�len�digest�ljust�update�	translate�trans_5C�trans_36)�self�key�msgr   r'