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group.rs
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117 lines (102 loc) · 3.06 KB
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use super::errors::ProofVerifyError;
use super::scalar::{Scalar, ScalarBytes, ScalarBytesFromScalar};
use core::borrow::Borrow;
use core::ops::{Mul, MulAssign};
pub type GroupElement = curve25519_dalek::ristretto::RistrettoPoint;
pub type CompressedGroup = curve25519_dalek::ristretto::CompressedRistretto;
pub trait CompressedGroupExt {
type Group;
fn unpack(&self) -> Result<Self::Group, ProofVerifyError>;
}
impl CompressedGroupExt for CompressedGroup {
type Group = curve25519_dalek::ristretto::RistrettoPoint;
fn unpack(&self) -> Result<Self::Group, ProofVerifyError> {
self
.decompress()
.ok_or_else(|| ProofVerifyError::DecompressionError(self.to_bytes()))
}
}
pub const GROUP_BASEPOINT_COMPRESSED: CompressedGroup =
curve25519_dalek::constants::RISTRETTO_BASEPOINT_COMPRESSED;
impl<'b> MulAssign<&'b Scalar> for GroupElement {
fn mul_assign(&mut self, scalar: &'b Scalar) {
let result = (self as &GroupElement) * Scalar::decompress_scalar(scalar);
*self = result;
}
}
impl<'b> Mul<&'b Scalar> for &GroupElement {
type Output = GroupElement;
fn mul(self, scalar: &'b Scalar) -> GroupElement {
self * Scalar::decompress_scalar(scalar)
}
}
impl<'b> Mul<&'b GroupElement> for &Scalar {
type Output = GroupElement;
fn mul(self, point: &'b GroupElement) -> GroupElement {
Scalar::decompress_scalar(self) * point
}
}
macro_rules! define_mul_variants {
(LHS = $lhs:ty, RHS = $rhs:ty, Output = $out:ty) => {
impl<'b> Mul<&'b $rhs> for $lhs {
type Output = $out;
fn mul(self, rhs: &'b $rhs) -> $out {
&self * rhs
}
}
impl<'a> Mul<$rhs> for &'a $lhs {
type Output = $out;
fn mul(self, rhs: $rhs) -> $out {
self * &rhs
}
}
impl Mul<$rhs> for $lhs {
type Output = $out;
fn mul(self, rhs: $rhs) -> $out {
&self * &rhs
}
}
};
}
macro_rules! define_mul_assign_variants {
(LHS = $lhs:ty, RHS = $rhs:ty) => {
impl MulAssign<$rhs> for $lhs {
fn mul_assign(&mut self, rhs: $rhs) {
*self *= &rhs;
}
}
};
}
define_mul_assign_variants!(LHS = GroupElement, RHS = Scalar);
define_mul_variants!(LHS = GroupElement, RHS = Scalar, Output = GroupElement);
define_mul_variants!(LHS = Scalar, RHS = GroupElement, Output = GroupElement);
pub trait VartimeMultiscalarMul {
type Scalar;
fn vartime_multiscalar_mul<I, J>(scalars: I, points: J) -> Self
where
I: IntoIterator,
I::Item: Borrow<Self::Scalar>,
J: IntoIterator,
J::Item: Borrow<Self>,
Self: Clone;
}
impl VartimeMultiscalarMul for GroupElement {
type Scalar = super::scalar::Scalar;
fn vartime_multiscalar_mul<I, J>(scalars: I, points: J) -> Self
where
I: IntoIterator,
I::Item: Borrow<Self::Scalar>,
J: IntoIterator,
J::Item: Borrow<Self>,
Self: Clone,
{
use curve25519_dalek::traits::VartimeMultiscalarMul;
<Self as VartimeMultiscalarMul>::vartime_multiscalar_mul(
scalars
.into_iter()
.map(|s| Scalar::decompress_scalar(s.borrow()))
.collect::<Vec<ScalarBytes>>(),
points,
)
}
}