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ff: PrimeField: BitAnd<u64, Output = u64> + Shr<u32, Output = Self>

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This commit is contained in:
Jack Grigg
2020-04-22 10:45:51 +12:00
parent 1fdca393bb
commit 08500ee712
7 changed files with 348 additions and 17 deletions
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8
zcash_primitives/src/pedersen_hash.rs
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@@ -1,7 +1,7 @@
//! Implementation of the Pedersen hash function used in Sapling.
use crate::jubjub::*;
use ff::{Field, PrimeField, PrimeFieldRepr};
use ff::Field;
use std::ops::{AddAssign, Neg};
#[derive(Copy, Clone)]
@@ -88,16 +88,14 @@ where
let window = JubjubBls12::pedersen_hash_exp_window_size();
let window_mask = (1 << window) - 1;
let mut acc = acc.into_repr();
let mut tmp = edwards::Point::zero();
while !acc.is_zero() {
let i = (acc.as_ref()[0] & window_mask) as usize;
let i = (acc & window_mask) as usize;
tmp = tmp.add(&table[0][i], params);
acc.shr(window);
acc = acc >> window;
table = &table[1..];
}