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d� ZdS )zqHMAC (Keyed-Hashing for Message Authentication) 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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S )a? Create a new HMAC object.
key: bytes or buffer, key for the keyed hash object.
msg: bytes or buffer, Initial input for the hash or None.
digestmod: A hash name suitable for hashlib.new(). *OR*
A hashlib constructor returning a new hash object. *OR*
A module supporting PEP 247.
Required as of 3.8, despite its position after the optional
msg argument. Passing it as a keyword argument is
recommended, though not required for legacy API reasons.
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HMAC.__init__c C s d| j j S )Nzhmac-)r( �name)r6 r r r r: Z s z HMAC.namec C s | j �|� dS )z,Feed data from msg into this hashing object.N)r( r2 )r6 r8 r r r r2 ^ s zHMAC.updatec C s: | j �| j �}| j|_| j|_| j�� |_| j�� |_|S )zyReturn a separate copy of this hashing object.
An update to this copy won't affect the original object.
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