k256: use PrimeField::pow_vartime when computing Scalar::sqrt
#403
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I had previously attempted to do this in #400 but had trouble tracking down why it wasn't working. It seems the lower two limbs were shifted shifted 8-bits, i.e. a copy-paste error from Sage. I computed the correct limbs using `ff_derive`, and the tests now pass.
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I had previously attempted to do this in #400 but had trouble tracking down why it wasn't working. It seems the lower two limbs were shifted shifted 8-bits, i.e. a copy-paste error from Sage.
I computed the correct limbs using
ff_derive, and the tests now pass.