"tracked" sessions: "record of key usage" is undefined

[ddorwin]

record of key usage, which was added by pull request #54, is used as a variable in several algorithms but not clearly defined anywhere. It should probably be "this object's record of key usage" and be initialized in createSession().

In addition, it would probably be helpful to provide information about the variable. For example, that the record contains entries, as referenced in section 7.5.2 Encrypted Block Encountered. It might also help to make it plural somehow, since it has records for all keys in the session. (Both of these will be moot if the change proposed by #80 is made.)

first decrypt time and latest decrypt time are also undefined in section 7.5.2

[mwatson2]

The record of key usage is defined in the description of the "tracked" session type in Section 5. I agree we should explicitly initialize it.

[mwatson2]

I believe this is addressed by the changes proposed in #87

[mwatson2]

Addressed by PR #87.