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e j�Zej� r�eZddd�ZdS )zxHMAC (Keyed-Hashing for Message Authentication) Python module.
Implements the HMAC algorithm as described by RFC 2104.
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dd� Z dd� Z dS )�HMACz~RFC 2104 HMAC class. Also complies with RFC 4231.
This supports the API for Cryptographic Hash Functions (PEP 247).
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d| j td� | j}|| _t|�|k�r | j|�j� }|j|d�}| jj|j t �� | jj|j t �� |dk �rb| j|� dS )a1 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 and will be
removed in Python 3.6.
Note: key and msg must be a bytes or bytearray objects.
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r c C sX | d krt d��t| t�r"| j� S t| �r2| d�} t| tj�sFtd��| jj� j dd�S )Nz.'digestmod' argument is mandatory in FIPS moder z6Only OpenSSL hashlib hashes are accepted in FIPS mode.�_�-)
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zHMAC_openssl.__new__)NN)r r? r@ r9 r r r r rH � s rH c C s t | ||�S )aV Create a new hashing object and return it.
key: The starting key for the hash.
msg: if available, will immediately be hashed into the object's starting
state.
You can now feed arbitrary strings into the object using its update()
method, and can ask for the hash value at any time by calling its digest()
method.
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