BIND 10 #813: TSIG: verifying messages

[BIND 10 Development]

#813: TSIG: verifying messages
-------------------------------------+-------------------------------------
                   Reporter:         |                 Owner:  jinmei
  stephen                            |                Status:  accepted
                       Type:         |             Milestone:
  enhancement                        |  Sprint-20110503
                   Priority:  major  |            Resolution:
                  Component:         |             Sensitive:  0
  Unclassified                       |           Sub-Project:  DNS
                   Keywords:         |  Estimated Difficulty:  7.0
            Defect Severity:  N/A    |           Total Hours:  0
Feature Depending on Ticket:  tsig   |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Comment (by jinmei):

 Branch trac813 is ready for review.  It's based on a recent version
 of the trac871 branch, but is mostly independent from that branch
 functionality wise.  So this branch can be reviewed separately.

 Like the signing case, I chose separating this task to two subtasks:
 parsing incoming TSIG RR and verifying it.  This branch implements the
 first part.  I plan to create a separate ticket for the latter.

 Other notes:

 - the first commit (8320ec6) can be ignored.  It simply incorporates
 trac871.
 - commit e22700f (the changes under lib/util/unittests) is not
   directly related this task but I introduced it for additional tests
   for Message::toText().  Also, some part of it has duplicate
   functionality with lib/dns/unittest_util.  I plan to unify them and
   move generic utility to lib/util/unittests, which will be a separate
   task (and separate ticket)
 - the total diff is not small, but excluding the new files in
   unittests (they should be quite trivial) and test data, (I hope)
   it's essentially not that big.

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Ticket URL: <http://bind10.isc.org/ticket/813#comment:4>
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