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module-lattice: impl ctutils::CtEq for Polynomial, Vector, and NttMatrix #285

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Merged
tarcieri merged 1 commit into from
Apr 3, 2026
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module-lattice: impl ctutils::CtEq for Polynomial, Vector, and NttMatrix #285

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39 changes: 39 additions & 0 deletions module-lattice/src/algebra.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -230,6 +230,19 @@ impl<F: Field> Neg for &Polynomial<F> {
}
}

#[cfg(feature = "ctutils")]
impl<F: Field> CtEq for Polynomial<F>
where
F::Int: CtEq,
{
fn ct_eq(&self, other: &Self) -> Choice {
self.0.ct_eq(&other.0)
}
}

#[cfg(feature = "ctutils")]
impl<F: Field<Int: CtEq>> CtEqSlice for Polynomial<F> {}

/// A `Vector` is a vector of polynomials from `R_q` of length `K`.
///
/// Vectors can be added, subtracted, negated, and multiplied by field elements.
Expand Down Expand Up @@ -303,6 +316,19 @@ impl<F: Field, K: ArraySize> Neg for &Vector<F, K> {
}
}

#[cfg(feature = "ctutils")]
impl<F: Field, K: ArraySize> CtEq for Vector<F, K>
where
F::Int: CtEq,
{
fn ct_eq(&self, other: &Self) -> Choice {
self.0.ct_eq(&other.0)
}
}

#[cfg(feature = "ctutils")]
impl<F: Field<Int: CtEq>, K: ArraySize> CtEqSlice for Vector<F, K> {}

/// An `NttPolynomial` is a member of the NTT algebra `T_q = Z_q[X]^256` of 256-tuples of field
/// elements.
///
Expand Down Expand Up @@ -537,3 +563,16 @@ where
NttVector(self.0.iter().map(|x| x * rhs).collect())
}
}

#[cfg(feature = "ctutils")]
impl<F: Field, K: ArraySize, L: ArraySize> CtEq for NttMatrix<F, K, L>
where
F::Int: CtEq,
{
fn ct_eq(&self, other: &Self) -> Choice {
self.0.ct_eq(&other.0)
}
}

#[cfg(feature = "ctutils")]
impl<F: Field<Int: CtEq>, K: ArraySize, L: ArraySize> CtEqSlice for NttMatrix<F, K, L> {}