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Implementation of RFC2617: HTTP Digest Authentication
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Wrapper for L{digest.DigestCredentialFactory} that implements the
L{ICredentialFactory} interface.
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Create the digest credential factory that this object wraps.
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Generate the challenge for use in the WWW-Authenticate header
@param request: The L{IRequest} to with access was denied and for the
response to which this challenge is being generated.
@return: The L{dict} that can be used to generate a WWW-Authenticate
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Create a L{twisted.cred.credentials.DigestedCredentials} object
from the given response and request.
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