nostd support

Author: roblabla

Cargo.toml

@@ -12,15 +12,16 @@ categories = ["cryptography"]
 readme = "README.md"
 
 [dependencies]
-num-bigint = { version = "0.5", features = ["rand", "i128", "u64_digit", "prime", "zeroize"], package = "num-bigint-dig" }
-num-traits = "0.2.6"
-num-integer = "0.1.39"
-num-iter = "0.1.37"
-lazy_static = "1.3.0"
-rand = "0.6.5"
-byteorder = "1.3.1"
-failure = "0.1.5"
-subtle = "2.0.0"
+num-bigint = { version = "0.5", features = ["i128", "u64_digit", "prime", "zeroize"], default-features = false, package = "num-bigint-dig" }
+num-traits = { version = "0.2.6", default-features = false }
+num-integer = { version = "0.1.39", default-features = false }
+num-iter = { version = "0.1.37", default-features = false }
+lazy_static = { version = "1.3.0", features = ["spin_no_std"] }
+rand = { version = "0.6.5", default-features = false }
+byteorder = { version = "1.3.1", default-features = false }
+failure = { version = "0.1.5", default-features = false, features = ["derive"] }
+subtle = { version = "2.0.0", default-features = false }
+libm = "0.1.4"
 
 [dependencies.zeroize]
 version = "0.10.1"
@@ -30,10 +31,10 @@ features = ["alloc", "zeroize_derive"]
 optional = true
 version = "1.0.89"
 default-features = false
-features = ["std", "derive"]
+features = ["derive"]
 
 [dev-dependencies]
-base64 = "0.10.1"
+#base64 = "0.10.1"
 sha-1 = "0.8.1"
 sha2 = "0.8.0"
 hex = "0.4.0"
@@ -50,7 +51,8 @@ name = "key"
 # debug = true
 
 [features]
-default = []
+default = ["std"]
+std = []
 nightly = ["subtle/nightly", "num-bigint/nightly"]
 serde1 = ["num-bigint/serde", "serde"]
 expose-internals = []

src/algorithms.rs

@@ -2,6 +2,7 @@ use num_bigint::traits::ModInverse;
 use num_bigint::{BigUint, RandPrime};
 use num_traits::{FromPrimitive, One, Zero};
 use rand::Rng;
+use libm::F64Ext;
 
 use crate::errors::{Error, Result};
 use crate::key::RSAPrivateKey;

src/errors.rs

@@ -1,4 +1,4 @@
-pub type Result<T> = ::std::result::Result<T, Error>;
+pub type Result<T> = core::result::Result<T, Error>;
 
 /// Error types
 #[derive(Debug, Fail)]

src/hash.rs

@@ -1,3 +1,5 @@
+use alloc::vec::Vec;
+
 /// A generic trait that exposes the information that is needed for a hash function to be
 /// used in `sign` and `verify.`.
 pub trait Hash {

src/internals.rs

@@ -1,7 +1,8 @@
 use num_bigint::{BigInt, BigUint, IntoBigInt, IntoBigUint, ModInverse, RandBigInt, ToBigInt};
 use num_traits::{One, Signed, Zero};
 use rand::Rng;
-use std::borrow::Cow;
+use alloc::vec::Vec;
+use alloc::borrow::Cow;
 use zeroize::Zeroize;
 
 use crate::errors::{Error, Result};

src/key.rs

@@ -1,8 +1,10 @@
+use alloc::vec::Vec;
 use num_bigint::traits::ModInverse;
 use num_bigint::Sign::Plus;
 use num_bigint::{BigInt, BigUint};
 use num_traits::{FromPrimitive, One};
-use rand::{rngs::ThreadRng, Rng};
+use rand::rngs::StdRng;
+use rand::Rng;
 #[cfg(feature = "serde1")]
 use serde::{Deserialize, Serialize};
 use zeroize::Zeroize;
@@ -403,7 +405,7 @@ impl RSAPrivateKey {
     pub fn decrypt(&self, padding: PaddingScheme, ciphertext: &[u8]) -> Result<Vec<u8>> {
         match padding {
             // need to pass any Rng as the type arg, so the type checker is happy, it is not actually used for anything
-            PaddingScheme::PKCS1v15 => pkcs1v15::decrypt::<ThreadRng>(None, self, ciphertext),
+            PaddingScheme::PKCS1v15 => pkcs1v15::decrypt::<StdRng>(None, self, ciphertext),
             PaddingScheme::OAEP => unimplemented!("not yet implemented"),
             _ => Err(Error::InvalidPaddingScheme),
         }
@@ -432,7 +434,7 @@ impl RSAPrivateKey {
         digest: &[u8],
     ) -> Result<Vec<u8>> {
         match padding {
-            PaddingScheme::PKCS1v15 => pkcs1v15::sign::<ThreadRng, _>(None, self, hash, digest),
+            PaddingScheme::PKCS1v15 => pkcs1v15::sign::<StdRng, _>(None, self, hash, digest),
             PaddingScheme::PSS => unimplemented!("not yet implemented"),
             _ => Err(Error::InvalidPaddingScheme),
         }

src/lib.rs

@@ -26,6 +26,16 @@
 //! ```
 //!
 
+#![no_std]
+
+#[cfg(feature = "std")]
+#[macro_use]
+extern crate std as alloc;
+
+#[cfg(not(feature = "std"))]
+#[macro_use]
+extern crate alloc;
+
 #[macro_use]
 extern crate lazy_static;
 

src/pkcs1v15.rs

@@ -1,3 +1,4 @@
+use alloc::vec::Vec;
 use num_bigint::BigUint;
 use rand::Rng;
 use subtle::{Choice, ConditionallySelectable, ConstantTimeEq};