verifies the tsig rr for the given packet and key.
The wire must be given too because tsig does not sign normalized packets.
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Returns true if tsig is correct, false if not, or if tsig is not set
ldns_pkt_tsig_sign()
creates a tsig rr for the given packet and key.
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pkt: the packet to sign
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key_name: the name of the shared key
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key_data: the key in base 64 format
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fudge: seconds of error permitted in time signed
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algorithm_name: the name of the algorithm used
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query_mac: is added to the digest if not NULL (so NULL is for signing queries, not NULL is for signing answers)
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Returns status (OK if success)
AUTHOR
The ldns team at NLnet Labs. Which consists out of
Jelte Jansen and Miek Gieben.