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Remove Scalar::multiply_add

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This commit is contained in:
Henry de Valence 2017-11-30 16:44:51 -08:00
parent 9e892dd5f3
commit 1caed9a4fc
1 changed files with 2 additions and 17 deletions
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19
src/scalar.rs
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@ -512,11 +512,6 @@ impl Scalar {
UnpackedScalar::from_bytes(&self.bytes) UnpackedScalar::from_bytes(&self.bytes)
} }
/// Compute `(a * b) + c` (mod l).
pub fn multiply_add(a: &Scalar, b: &Scalar, c: &Scalar) -> Scalar {
UnpackedScalar::add(&UnpackedScalar::mul(&a.unpack(), &b.unpack()), &c.unpack()).pack()
}
/// Reduce this `Scalar` modulo \\(\ell\\). /// Reduce this `Scalar` modulo \\(\ell\\).
pub fn reduce(&self) -> Scalar { pub fn reduce(&self) -> Scalar {
let x = self.unpack(); let x = self.unpack();
@ -759,9 +754,7 @@ mod test {
#[test] #[test]
fn scalar_multiply_by_one() { fn scalar_multiply_by_one() {
let one = Scalar::one(); let test_scalar = &X * &Scalar::one();
let zero = Scalar::zero();
let test_scalar = Scalar::multiply_add(&X, &one, &zero);
for i in 0..32 { for i in 0..32 {
assert!(test_scalar[i] == X[i]); assert!(test_scalar[i] == X[i]);
} }
@ -788,17 +781,9 @@ mod test {
assert_eq!(should_be_X_times_Y, X_TIMES_Y); assert_eq!(should_be_X_times_Y, X_TIMES_Y);
} }
#[test]
fn scalar_multiply_add() {
let test_scalar = Scalar::multiply_add(&X, &Y, &Z);
for i in 0..32 {
assert!(test_scalar[i] == W[i]);
}
}
#[test] #[test]
fn square() { fn square() {
let expected = Scalar::multiply_add(&X, &X, &Scalar::zero()); let expected = &X * &X;
let actual = X.unpack().square().pack(); let actual = X.unpack().square().pack();
for i in 0..32 { for i in 0..32 {
assert!(expected[i] == actual[i]); assert!(expected[i] == actual[i]);