crypto-bigint 0.7.3

Pure Rust implementation of a big integer library which has been designed from the ground-up for use in cryptographic applications. Provides constant-time, no_std-friendly implementations of modern formulas using const generics.
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
28
29
30
31
32
33
34
35

//! Common functionality shared between tests.

// Different tests may use only a subset of the available functionality
#![allow(dead_code)]

use crypto_bigint::{Encoding, Limb};
use num_bigint::{BigInt, BigUint};

/// [`Int`] to [`num_bigint::BigInt`]
pub fn to_bigint<T>(int: &T) -> BigInt
where
    T: AsRef<[Limb]>,
{
    let mut bytes = Vec::with_capacity(int.as_ref().len() * Limb::BYTES);

    for limb in int.as_ref() {
        bytes.extend_from_slice(&limb.to_le_bytes());
    }

    BigInt::from_signed_bytes_le(&bytes)
}

/// [`Uint`] to [`num_bigint::BigUint`]
pub fn to_biguint<T>(uint: &T) -> BigUint
where
    T: AsRef<[Limb]>,
{
    let mut bytes = Vec::with_capacity(uint.as_ref().len() * Limb::BYTES);

    for limb in uint.as_ref() {
        bytes.extend_from_slice(&limb.to_le_bytes());
    }

    BigUint::from_bytes_le(&bytes)
}