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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.
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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.
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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.
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