fastcrypto 0.1.9

Common cryptographic library used at Mysten Labs
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27

// Copyright (c) 2022, Mysten Labs, Inc.
// SPDX-License-Identifier: Apache-2.0

//! This module contains implementations of optimised scalar multiplication algorithms where the
//! group element is fixed and certain multiples of this may be pre-computed.

#[cfg(feature = "experimental")]
pub mod bgmw;
mod integer_utils;
pub mod windowed;

/// Trait for scalar multiplication for a fixed group element, e.g. by using precomputed values.
pub trait ScalarMultiplier<G, S> {
    /// Create a new scalar multiplier with the given base element.
    fn new(base_element: G, zero: G) -> Self;

    /// Compute `self.base_element * scalar`.
    fn mul(&self, scalar: &S) -> G;

    /// Compute `self.base_element * base_scalar + other_element * other_scalar`.
    fn two_scalar_mul(&self, base_scalar: &S, other_element: &G, other_scalar: &S) -> G;
}

pub trait ToLittleEndianBytes {
    /// Serialize scalar into a byte vector in little-endian format.
    fn to_le_bytes(&self) -> Vec<u8>;
}