Make short_weierstrass::Affine's infinity flag conditional
#639
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Pratyush
requested review from
mmagician and
weikengchen
and removed request for
a team
|
Note that I'm not sure this is necessarily a change that we want: the resulting UX is worse (implementors of For the first issue, maybe we can provide a macro or something that automatically makes the choice for end users. For the second issue, we should benchmark and see if there's perf differences. |
Pratyush
commented
Apr 21, 2023
| @@ -30,6 +33,9 @@ pub trait SWCurveConfig: super::CurveConfig { | |||
| /// Generator of the prime-order subgroup. | |||
| const GENERATOR: Affine<Self>; | |||
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| /// A type that is stored in `Affine<Self>` to indicate whether the point is at infinity. | |||
| type ZeroIndicator: ZeroInd<Self>; | |||
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Not really happy with this name; happy to take suggestions for better name.
Pratyush
commented
Apr 21, 2023
| @@ -198,3 +204,30 @@ pub trait SWCurveConfig: super::CurveConfig { | |||
| } | |||
| } | |||
| } | |||
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| pub trait ZeroInd<C: SWCurveConfig>: | |||
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Description
This PR allows
short_weierstrass::Affine's layout to conditionally contain aboolflag indicating whether or not it is zero. This is helpful for compressing the representation of the point in memory. Note that due to the unfortunate lack of associated type defaults, we cannot set the type of the flag to beboolby default.In the future, it would be nice to automatically derive this from certain conditions (e.g.,
A.is_zero())Before we can merge this PR, please make sure that all the following items have been
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Pendingsection inCHANGELOG.mdFiles changedin the GitHub PR explorer