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Prevent BLS Affine values from being coerced. #420

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Jun 28, 2023
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Prevent BLS Affine values from being coerced. #420

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4 changes: 4 additions & 0 deletions cardano-crypto-class/src/Cardano/Crypto/EllipticCurve/BLS12_381/Internal.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -232,6 +232,10 @@ type Point2 = Point Curve2

newtype Affine curve = Affine (ForeignPtr Void)

-- Making sure different 'Affine's are not 'Coercible', which would ruin the
-- intended type safety:
type role Affine nominal

type Affine1 = Affine Curve1
type Affine2 = Affine Curve2

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