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Tests for L{twisted.cred}'s implementation of CRAM-MD5.
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Tests for L{CramMD5Credentials}.
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The same L{CramMD5Credentials} will always provide the same challenge,
no matter how many times it is called.
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When a valid response (which is a hex digest of the challenge that has
been encrypted by the user's shared secret) is set on the
L{CramMD5Credentials} that created the challenge, and C{checkPassword}
is called with the user's shared secret, it will return L{True}.
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When there is no response set, calling C{checkPassword} will return
L{False}.
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When an invalid response is set on the L{CramMD5Credentials} (one that
is not the hex digest of the challenge, encrypted with the user's shared
secret) and C{checkPassword} is called with the user's correct shared
secret, it will return L{False}.
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When C{setResponse} is called with a string that is the username and
the hashed challenge separated with a space, they will be set on the
L{CramMD5Credentials}.
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L{CramMD5Credentials} implements the L{IUsernameHashedPassword}
interface.
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