crypto: derive key image generator #10133
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Helper function to derive I (the key image generator) used in the
FCMP++ composition. The key image generator enters the FCMP++ tree
as part of an output tuple {output pubkey, key image generator,
commitment}.
Note: key images are x*I, where x is the one-time priv key used
to spend an output.
Contributor
|
I would hold off on this PR until the unbiased hash-to-point details pan out because if they do, then this PR changes too. |
Collaborator
Author
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I would like to progress toward getting the tree building code reviewed, which this PR would be a necessary pre-req for. I figure this function would become something like |
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Helper function to derive
I(the key image generator) used in the FCMP++ composition. The key image generator enters the FCMP++ tree as part of an output tuple {output pubkey, key image generator, commitment}.Note: key images are x*I, where x is the one-time priv key used to spend an output.
See: https://github.com/kayabaNerve/fcmp-plus-plus-paper/blob/6f01fd3296b17f90b5c97c738cc3320e3369ad49/fcmp%2B%2B.pdf