WIP: no-alloc

Cargo.toml

@@ -15,21 +15,21 @@ exclude = ["marvin_toolkit/", "thirdparty/"]
 
 [dependencies]
 const-oid = { version = "0.10", default-features = false }
-crypto-bigint = { version = "0.7.0-rc.16", default-features = false, features = ["zeroize", "alloc"] }
+crypto-bigint = { version = "0.7.0-rc.16", default-features = false, features = ["zeroize"] }
 crypto-primes = { version = "0.7.0-pre.6", default-features = false }
-digest = { version = "0.11.0-rc.4", default-features = false, features = ["alloc", "oid"] }
+digest = { version = "0.11.0-rc.4", default-features = false, features = ["oid"] }
 rand_core = { version = "0.10.0-rc-2", default-features = false }
-signature = { version = "3.0.0-rc.5", default-features = false, features = ["alloc", "digest", "rand_core"] }
-zeroize = { version = "1.8", features = ["alloc"] }
+signature = { version = "3.0.0-rc.5", default-features = false, features = ["digest", "rand_core"] }
+zeroize = { version = "1.8" }
 
 # optional dependencies
 crypto-common = { version = "0.2.0-rc.8", optional = true, features = ["getrandom"] }
-pkcs1 = { version = "0.8.0-rc.3", optional = true, default-features = false, features = ["alloc", "pem"] }
-pkcs8 = { version = "0.11.0-rc.8", optional = true, default-features = false, features = ["alloc", "pem"] }
+pkcs1 = { version = "0.8.0-rc.3", optional = true, default-features = false, features = ["pem"] }
+pkcs8 = { version = "0.11.0-rc.8", optional = true, default-features = false, features = ["pem"] }
 serdect = { version = "0.4", optional = true }
 sha1 = { version = "0.11.0-rc.3", optional = true, default-features = false, features = ["oid"] }
 sha2 = { version = "0.11.0-rc.3", optional = true, default-features = false, features = ["oid"] }
-spki = { version = "0.8.0-rc.4", optional = true, default-features = false, features = ["alloc"] }
+spki = { version = "0.8.0-rc.4", optional = true, default-features = false }
 serde = { version = "1.0.184", optional = true, default-features = false, features = ["derive"] }
 
 [dev-dependencies]
@@ -51,16 +51,17 @@ rstest = "0.26.1"
 name = "key"
 
 [features]
-default = ["std", "encoding"]
+default = ["std", "alloc", "encoding"]
 encoding = ["dep:pkcs1", "dep:pkcs8", "dep:spki"]
 hazmat = []
 getrandom = ["crypto-bigint/getrandom", "crypto-common"]
 serde = ["encoding", "dep:serde", "dep:serdect", "crypto-bigint/serde"]
 pkcs5 = ["pkcs8/encryption"]
-std = ["pkcs1?/std", "pkcs8?/std"]
+alloc = ["crypto-bigint/alloc", "digest/alloc", "pkcs1?/alloc", "pkcs8?/alloc", "signature/alloc", "spki?/alloc", "zeroize/alloc"]
+std = ["alloc", "pkcs1?/std", "pkcs8?/std"]
 
 [package.metadata.docs.rs]
-features = ["std", "serde", "hazmat", "sha2"]
+features = ["std", "alloc", "serde", "hazmat", "sha2"]
 
 [profile.dev]
 opt-level = 2

README.md

@@ -12,7 +12,7 @@ A portable RSA implementation in pure Rust.
 
 ## Example
 
-```rust
+```ignore
 use rsa::{Pkcs1v15Encrypt, RsaPrivateKey, RsaPublicKey};
 
 let mut rng = rand::thread_rng();

src/lib.rs

@@ -22,8 +22,8 @@
 //!
 //! Note: requires `sha2` feature of `rsa` crate is enabled.
 //!
-#![cfg_attr(feature = "sha2", doc = "```")]
-#![cfg_attr(not(feature = "sha2"), doc = "```ignore")]
+#![cfg_attr(all(feature = "sha2", feature = "alloc"), doc = "```")]
+#![cfg_attr(any(not(feature = "sha2"), not(feature = "alloc")), doc = "```ignore")]
 //! use rsa::{RsaPrivateKey, RsaPublicKey, Oaep, sha2::Sha256};
 //!
 //! let mut rng = rand::thread_rng();
@@ -45,7 +45,8 @@
 //! ```
 //!
 //! ## PKCS#1 v1.5 encryption
-//! ```
+#![cfg_attr(feature = "alloc", doc = "```")]
+#![cfg_attr(not(feature = "alloc"), doc = "```ignore")]
 //! use rsa::{RsaPrivateKey, RsaPublicKey, Pkcs1v15Encrypt};
 //!
 //! let mut rng = rand::thread_rng();
@@ -68,8 +69,8 @@
 //!
 //! Note: requires `sha2` feature of `rsa` crate is enabled.
 //!
-#![cfg_attr(feature = "sha2", doc = "```")]
-#![cfg_attr(not(feature = "sha2"), doc = "```ignore")]
+#![cfg_attr(all(feature = "sha2", feature = "alloc"), doc = "```")]
+#![cfg_attr(any(not(feature = "sha2"), not(feature = "alloc")), doc = "```ignore")]
 //! use rsa::RsaPrivateKey;
 //! use rsa::pkcs1v15::{SigningKey, VerifyingKey};
 //! use rsa::signature::{Keypair, RandomizedSigner, SignatureEncoding, Verifier};
@@ -95,8 +96,8 @@
 //!
 //! Note: requires `sha2` feature of `rsa` crate is enabled.
 //!
-#![cfg_attr(feature = "sha2", doc = "```")]
-#![cfg_attr(not(feature = "sha2"), doc = "```ignore")]
+#![cfg_attr(all(feature = "sha2", feature = "alloc"), doc = "```")]
+#![cfg_attr(any(not(feature = "sha2"), not(feature = "alloc")), doc = "```ignore")]
 //! use rsa::RsaPrivateKey;
 //! use rsa::pss::{BlindedSigningKey, VerifyingKey};
 //! use rsa::signature::{Keypair,RandomizedSigner, SignatureEncoding, Verifier};
@@ -143,7 +144,8 @@
 //!
 //! ### Example
 //!
-//! ```
+#![cfg_attr(feature = "alloc", doc = "```")]
+#![cfg_attr(not(feature = "alloc"), doc = "```ignore")]
 //! # fn main() -> Result<(), Box<dyn std::error::Error>> {
 //! # #[cfg(all(feature = "encoding", feature = "std"))]
 //! # {
@@ -187,7 +189,8 @@
 //!
 //! ### Example
 //!
-//! ```
+#![cfg_attr(feature = "alloc", doc = "```")]
+#![cfg_attr(not(feature = "alloc"), doc = "```ignore")]
 //! # fn main() -> Result<(), Box<dyn std::error::Error>> {
 //! # #[cfg(all(feature = "encoding", feature = "std"))]
 //! # {
@@ -218,24 +221,36 @@
 #[cfg(doctest)]
 pub struct ReadmeDoctests;
 
+#[cfg(feature = "alloc")]
 #[macro_use]
 extern crate alloc;
 #[cfg(feature = "std")]
 extern crate std;
 
+#[cfg(feature = "alloc")]
 pub use crypto_bigint::BoxedUint;
 pub use rand_core;
+#[cfg(feature = "alloc")]
 pub use signature;
 
+#[cfg(feature = "alloc")]
 mod algorithms;
+#[cfg(feature = "alloc")]
 pub mod errors;
+#[cfg(feature = "alloc")]
 pub mod oaep;
+#[cfg(feature = "alloc")]
 pub mod pkcs1v15;
+#[cfg(feature = "alloc")]
 pub mod pss;
+#[cfg(feature = "alloc")]
 pub mod traits;
 
+#[cfg(feature = "alloc")]
 mod dummy_rng;
+#[cfg(feature = "alloc")]
 mod encoding;
+#[cfg(feature = "alloc")]
 mod key;
 
 #[cfg(feature = "encoding")]
@@ -245,6 +260,7 @@ pub use pkcs8;
 #[cfg(feature = "sha2")]
 pub use sha2;
 
+#[cfg(feature = "alloc")]
 pub use crate::{
     errors::{Error, Result},
     key::{RsaPrivateKey, RsaPublicKey},
@@ -254,5 +270,5 @@ pub use crate::{
     traits::keys::CrtValue,
 };
 
-#[cfg(feature = "hazmat")]
+#[cfg(all(feature = "alloc", feature = "hazmat"))]
 pub mod hazmat;

tests/pkcs1.rs

@@ -1,6 +1,6 @@
 //! PKCS#1 encoding tests
 
-#![cfg(feature = "encoding")]
+#![cfg(all(feature = "alloc", feature = "encoding"))]
 
 use crypto_bigint::{BoxedUint, CtEq};
 use hex_literal::hex;

tests/pkcs1v15.rs

@@ -1,3 +1,4 @@
+#![cfg(feature = "alloc")]
 // simple but prevent regression - see https://github.com/RustCrypto/RSA/issues/329
 #[cfg(feature = "encoding")]
 #[test]

tests/pkcs8.rs

@@ -1,6 +1,6 @@
 //! PKCS#8 encoding tests
 
-#![cfg(feature = "encoding")]
+#![cfg(all(feature = "alloc", feature = "encoding"))]
 
 use crypto_bigint::{BoxedUint, CtEq};
 use hex_literal::hex;

tests/proptests.rs

@@ -1,6 +1,6 @@
 //! Property-based tests.
 
-#![cfg(feature = "hazmat")]
+#![cfg(all(feature = "alloc", feature = "hazmat"))]
 
 use proptest::prelude::*;
 use rand::rngs::ChaCha8Rng;

tests/wycheproof.rs

@@ -1,6 +1,6 @@
 //! Executes tests based on the wycheproof testsuite.
 
-#![cfg(feature = "encoding")]
+#![cfg(all(feature = "alloc", feature = "encoding"))]
 
 // This implementation here is based on
 // <https://github.com/ctz/graviola/blob/main/graviola/tests/wycheproof.rs>