Update halo2_gadgets/src/poseidon/primitives/mds.rs

Co-authored-by: Han <[email protected]>
privacy-scaling-explorations · Aug 25, 2023 · af860b2 · af860b2
1 parent f608afc
commit af860b2
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/halo2_gadgets/src/poseidon/primitives/mds.rs b/halo2_gadgets/src/poseidon/primitives/mds.rs
@@ -83,7 +83,7 @@ pub(super) fn generate_mds<F: FromUniformBytes<64> + Ord, const T: usize>(
             } else {
                 let diff: F = x_j - *x_m;
                 // We can invert freely; by construction, the elements of xs are distinct.
-                acc * (x - x_m) * diff.invert().unwrap()
+                acc * (x - x_m) * (x_j - x_m).invert().unwrap()
             }
         })
     };