[Ndn-interest] Adding HMAC to available NDN signature types

[Junxiao Shi]

Hi Adeola

I agree with the necessity of HMAC signature.

I have the following questions on the details:

   - What's expected to appear in KeyLocator?
   - What's the benefit of using opad and ipad?
   - Why should SignatureValue contain two SHA256 hash functions? Why not
   use just "SHA256(KeyValue, Name, MetaInfo, Content, SignatureInfo)"?


An accompanying document is needed to cover some guidance about how to
design an application that makes use of HMAC signature and still guarantee
a strong level of provenance.
In particular, is this scheme usable if producer and sender do not exist at
the same time?

Yours, Junxiao​
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