no std

src/curve/extended_edwards.rs

@@ -8,7 +8,7 @@ use crypto_bigint::subtle::{
     Choice, ConditionallyNegatable, ConditionallySelectable, ConstantTimeEq,
 };
 use fiat_crypto::p448_solinas_64::*;
-use std::ops::{Add, Mul, Neg};
+use core::ops::{Add, Mul, Neg};
 
 /// Extends projective coordinates by adding an additional
 /// auxiliary coordinate to speed up certain calculations.

src/curve/field/field_element.rs

@@ -2,13 +2,13 @@ use crypto_bigint::subtle::{
     Choice, ConditionallyNegatable, ConditionallySelectable, ConstantTimeEq,
 };
 use fiat_crypto::p448_solinas_64::*;
-use std::ops::{Add, Mul, Sub};
+use core::ops::{Add, Mul, Sub};
 
 #[derive(Copy, Clone)]
 pub struct FieldElement(pub(crate) fiat_p448_tight_field_element);
 
-impl std::fmt::Debug for FieldElement {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+impl core::fmt::Debug for FieldElement {
+    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
         f.debug_tuple("FieldElement").field(&self.0 .0).finish()
     }
 }

src/curve/field/field_element_serde.rs

@@ -1,7 +1,7 @@
 use base64::Engine;
 use serde::de::{self, Visitor};
 use serde::{Deserialize, Deserializer, Serialize, Serializer};
-use std::fmt;
+use core::fmt;
 
 use super::field_element::FieldElement;
 

src/curve/field/scalar.rs

@@ -1,4 +1,4 @@
-use std::ops::{Mul, Sub};
+use core::ops::{Mul, Sub};
 
 use crypto_bigint::{
     const_residue, impl_modulus,

src/lib.rs

@@ -1,3 +1,5 @@
+#![no_std]
+
 #![warn(clippy::just_underscores_and_digits)]
 /// Module for all EC operations.
 pub mod curve {