Finally make modular-frost work with alloc alone

Carries the update to `frost-schnorrkel` and `bitcoin-serai`.

crypto/frost/src/algorithm.rs

@@ -1,5 +1,7 @@
 use core::{marker::PhantomData, fmt::Debug};
-use std::io::{self, Read, Write};
+#[allow(unused_imports)]
+use std_shims::prelude::*;
+use std_shims::io::{self, Read, Write};
 
 use zeroize::Zeroizing;
 use rand_core::{RngCore, CryptoRng};

crypto/frost/src/curve/mod.rs

@@ -1,5 +1,7 @@
 use core::{ops::Deref, convert::AsRef};
-use std::io::{self, Read};
+#[allow(unused_imports)]
+use std_shims::prelude::*;
+use std_shims::io::{self, Read};
 
 use rand_core::{RngCore, CryptoRng};
 

crypto/frost/src/lib.rs

@@ -1,8 +1,11 @@
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 #![doc = include_str!("../README.md")]
+#![cfg_attr(not(feature = "std"), no_std)]
 
 use core::fmt::Debug;
-use std::collections::HashMap;
+#[allow(unused_imports)]
+use std_shims::prelude::*;
+use std_shims::collections::HashMap;
 
 use thiserror::Error;
 

crypto/frost/src/nonce.rs

@@ -6,7 +6,9 @@
 // Each nonce remains of the form (d, e) and made into a proper nonce with d + (e * b)
 
 use core::ops::Deref;
-use std::{
+#[allow(unused_imports)]
+use std_shims::prelude::*;
+use std_shims::{
   io::{self, Read, Write},
   collections::HashMap,
 };

crypto/frost/src/sign.rs

@@ -1,5 +1,7 @@
 use core::{ops::Deref, fmt::Debug};
-use std::{
+#[allow(unused_imports)]
+use std_shims::prelude::*;
+use std_shims::{
   io::{self, Read, Write},
   collections::HashMap,
 };

crypto/frost/src/tests/mod.rs

@@ -1,4 +1,4 @@
-use std::collections::HashMap;
+use std_shims::collections::HashMap;
 
 use rand_core::{RngCore, CryptoRng};
 

crypto/frost/src/tests/nonces.rs

@@ -1,4 +1,4 @@
-use std::io::{self, Read};
+use std_shims::io::{self, Read};
 
 use zeroize::Zeroizing;
 

crypto/frost/src/tests/vectors.rs

@@ -1,8 +1,8 @@
 use core::ops::Deref;
 
-use std::collections::HashMap;
+use std_shims::collections::HashMap;
 #[cfg(test)]
-use std::str::FromStr;
+use core::str::FromStr;
 
 use zeroize::Zeroizing;