Registered algorithm vs supported algorithm

When doing  generate call, I am not sure where the correct location for
putting in a failure would go for an algorithm that is registered but is not
implemented.

 

The normalization function does not appear to check that the algorithm is
supported - only that a recognized alias is given.  I would assume that this
should fail with InvalidAlgorithmError if a recognized but not implemented
name is given (as this would be the default with a new alias).

 

However if a dictionary I given, there is no check there that name is in the
implemented table.    The generate function would appear to say that a
registered, but unimplemented algorithm would be treated as a non-registered
algorithm as the check for support would fail and thus return
NotSupportError.  

 

It would be nice of the same error would be returned in both cases,
especially if I can normalize all of the algorithms at the time of
implementation - but wanted to return a not supported error in the case it
was not implemented.  I am not sure if this is reasonable behavior or not.

 

Jim