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Calculations for HTTP Digest authentication.

@see: U{http://www.faqs.org/rfcs/rfc2617.html}
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    Compute H(A1) from RFC 2617.

    @param pszAlg: The name of the algorithm to use to calculate the digest.
        Currently supported are md5, md5-sess, and sha.
    @param pszUserName: The username
    @param pszRealm: The realm
    @param pszPassword: The password
    @param pszNonce: The nonce
    @param pszCNonce: The cnonce

    @param preHA1: If available this is a str containing a previously
       calculated H(A1) as a hex string.  If this is given then the values for
       pszUserName, pszRealm, and pszPassword must be L{None} and are ignored.
    zPpreHA1 is incompatible with the pszUserName, pszRealm, and pszPassword argumentsN�:r)�	TypeError�
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    Compute H(A2) from RFC 2617.

    @param algo: The name of the algorithm to use to calculate the digest.
        Currently supported are md5, md5-sess, and sha.
    @param pszMethod: The request method.
    @param pszDigestUri: The request URI.
    @param pszQop: The Quality-of-Protection value.
    @param pszHEntity: The hash of the entity body or L{None} if C{pszQop} is
        not C{'auth-int'}.
    @return: The hash of the A2 value for the calculation of the response
        digest.
    rsauth-int�rr	rr
)�algo�	pszMethod�pszDigestUri�pszQop�
pszHEntityrrrr�calcHA2Ss





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    Compute the digest for the given parameters.

    @param HA1: The H(A1) value, as computed by L{calcHA1}.
    @param HA2: The H(A2) value, as computed by L{calcHA2}.
    @param pszNonce: The challenge nonce.
    @param pszNonceCount: The (client) nonce count value for this response.
    @param pszCNonce: The client nonce.
    @param pszQop: The Quality-of-Protection value.
    rr)	r�HA2rr�
pszNonceCountrrr�respHashrrr�calcResponseks











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