AlkantarClanX12
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for the input parameters, the HMAC MAC calculated by applying the
TSIG signature algorithm, and the TSIG digest context.
@rtype: (string, string, hmac.HMAC object)
@raises ValueError: I{other_data} is too long
@raises NotImplementedError: I{algorithm} is not supported
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@raises FormError: The TSIG is badly formed.
@raises BadTime: There is too much time skew between the client and the
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@raises BadSignature: The TSIG signature did not validate
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f S( sl Return the tsig algorithm for the specified tsig_rdata
@raises FormError: The TSIG is badly formed.
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