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Allow libcrux to be compiled for no_std (embedded) environments
This allows libcrux to be compiled with the minimal Rust runtime, also known as `no_std`. This is necessary for some highly-constrained code environments, such as embedded devices, kernels, etc., where the full dependency set of the Rust standard library is too large or requires capabilities that do not exist in the target environment. To do this, I added a new Cargo "feature" to the crate, called `std`. This feature is enabled by default. To target a `no_std` environment, you must first disable the default feature, then opt-in to only the features that your target environment needs. The `rand` crate itself currently has a dependency on `std`, so the `rand` feature depends on `std`. If the `rand` crate itself provides a `no_std` environment, then this requirement could be lifted.
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Arlie Davis
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Jan 26, 2024
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@@ -34,6 +34,7 @@ use crate::{ | |
aead::{self, *}, | ||
hmac::tag_size, | ||
}; | ||
use alloc::vec::Vec; | ||
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use super::errors::*; | ||
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//! # Key Encapsulation Mechanism | ||
//! | ||
//! A KEM interface. | ||
use alloc::vec::Vec; | ||
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use rand::{CryptoRng, Rng}; | ||
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use std::usize; | ||
use core::usize; | ||
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use super::{ | ||
arithmetic::PolynomialRingElement, | ||
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