[curves] How to find another generator on decaf_448？

[Fan Jiang]

Hi,
I'm currently working on a CramerShoup implementation using decaf_448,
Whereas decaf is to eliminate the cofactor by compression,
Should I still use the equation "orderQ*cofactor*P == identity" to check
the candidate generator P?
Or, What should be a "valid" generator mean in this use case?

Thanks,
Fan
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