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��_��@sFdZdZdddgZddlmZddlTdZGd	d�d�Zdd
d�ZdS)a�HMAC (Hash-based Message Authentication Code) algorithm

HMAC is a MAC defined in RFC2104_ and FIPS-198_ and constructed using
a cryptograpic hash algorithm.
It is usually named *HMAC-X*, where *X* is the hash algorithm; for
instance *HMAC-SHA1* or *HMAC-MD5*.

The strength of an HMAC depends on:

 - the strength of the hash algorithm
 - the length and entropy of the secret key

An example of possible usage is the following:

    >>> from Crypto.Hash import HMAC
    >>>
    >>> secret = b'Swordfish'
    >>> h = HMAC.new(secret)
    >>> h.update(b'Hello')
    >>> print h.hexdigest()

.. _RFC2104: http://www.ietf.org/rfc/rfc2104.txt
.. _FIPS-198: http://csrc.nist.gov/publications/fips/fips198/fips-198a.pdf
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||��|r�|�|�dS)a�Create a new HMAC object.

        :Parameters:
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            `digest_size` of the underlying hash algorithm.
          msg : byte string
            The very first chunk of the message to authenticate.
            It is equivalent to an early call to `update()`. Optional.
        :Parameter digestmod:
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            Default is `Crypto.Hash.MD5`.
        :Type digestmod:
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        :Parameters:
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        N)rr)rrrrrr�szHMAC.updatecCs0ttd��}|j|_|j��|_|j��|_|S)a!Return a copy ("clone") of the MAC object.

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z	HMAC.copycCs"|j��}|�|j���|��S)a}Return the **binary** (non-printable) MAC of the message that has
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        :Return: A byte string of `digest_size` bytes. It may contain non-ASCII
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zHMAC.digestcCsd�dd�t|���D��S)aReturn the **printable** MAC of the message that has been
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1cCst|||�S)a�Create a new HMAC object.

    :Parameters:
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        It must be long enough to match the expected security level of the
        MAC. However, there is no benefit in using keys longer than the
        `digest_size` of the underlying hash algorithm.
      msg : byte string
        The very first chunk of the message to authenticate.
        It is equivalent to an early call to `HMAC.update()`.
        Optional.
    :Parameter digestmod:
        The hash to use to implement the HMAC. Default is `Crypto.Hash.MD5`.
    :Type digestmod:
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    :Returns: An `HMAC` object
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