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-This "util" directory is provided for utility header files and
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-implementations.
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-.
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-
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-The functionality provided in these tools is generally available in
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-other external or perhaps system supplied libraries. The basic
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-development policy of BIND 10 is to avoid "reinventing wheels" unless
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-they belong to the exact technology area that BIND 10 targets (e.g.,
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-DNS). However, libdns++ is a very core part of BIND 10, and is also
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-intended to be used as a public library, so dependency from libdns++
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-to external libraries should be minimized. The utilities in this
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-directory are provided balancing two policies and as a kind of
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-compromise.
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-
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-The header files in this directory are therefore not intended to be
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-installed. Likewise, classes and public functions defined in this
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-directory are not intended to be used outside libdns++, although we
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-cannot prohibit it at the language level.
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-
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-They are not even expected to be used in other modules of BIND 10 than
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-libdns++ based on the basic policy explained above. Other modules
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-should only rely on the DNS specific interface that may internally
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-rely on these utility interfaces, or should use external libraries if
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-the other module really needs to use the utility feature directly.
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-There seem to be some violations as of this writing, but we should
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-eventually fix it. A notable example is the SHA1 interfaces. They
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-are defined here in the context of NSEC3 processing, but, in fact,
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-they are not even used from any of the other libdns++ classes or
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-functions. The SHA1 related interfaces should be moved to the
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-application that needs it or the application should only access it
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-through DNS specific interfaces defined in libdns++.
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chenzhengzhang