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Improve Field::pow API and impl

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Renamed to Field::pow_vartime to indicate it is still variable time with
respect to the exponent.
This commit is contained in:
Jack Grigg
2019-05-15 11:24:00 +01:00
parent e88e2a9dc2
commit 1c9f5742fa
15 changed files with 75 additions and 72 deletions
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4
ff/ff_derive/src/lib.rs
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@@ -427,7 +427,7 @@ fn prime_field_constants_and_sqrt(
// Because r = 3 (mod 4)
// sqrt can be done with only one exponentiation,
// via the computation of self^((r + 1) // 4) (mod r)
let sqrt = self.pow(#mod_plus_1_over_4);
let sqrt = self.pow_vartime(#mod_plus_1_over_4);
::subtle::CtOption::new(
sqrt,
@@ -447,7 +447,7 @@ fn prime_field_constants_and_sqrt(
use ::subtle::{ConditionallySelectable, ConstantTimeEq};
// w = self^((t - 1) // 2)
let w = self.pow(#t_minus_1_over_2);
let w = self.pow_vartime(#t_minus_1_over_2);
let mut v = S;
let mut x = *self * &w;