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ff: Remove SqrtField trait

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The sqrt() function is now part of the Field trait. ff_derive returns an
error on fields for which it does not support generating a square root
function.

Note that Fq6 and Fq12 in pairing::bls12_381 leave the function
unimplemented. They will be dropped once the migration to the bls12_381
crate is complete. The equivalent structs in that crate are not exposed.
This commit is contained in:
Jack Grigg
2020-05-01 13:48:30 +12:00
parent b02cf3b467
commit 1761ebfb35
20 changed files with 124 additions and 137 deletions
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4
bellman/src/groth16/tests/dummy_engine.rs
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@@ -1,4 +1,4 @@
use ff::{Field, PowVartime, PrimeField, ScalarEngine, SqrtField};
use ff::{Field, PowVartime, PrimeField, ScalarEngine};
use group::{CurveAffine, CurveProjective, EncodedPoint, GroupDecodingError};
use pairing::{Engine, PairingCurveAffine};
@@ -217,9 +217,7 @@ impl Field for Fr {
fn frobenius_map(&mut self, _: usize) {
// identity
}
}
impl SqrtField for Fr {
fn sqrt(&self) -> CtOption<Self> {
// Tonelli-Shank's algorithm for q mod 16 = 1
// https://eprint.iacr.org/2012/685.pdf (page 12, algorithm 5)