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-rw-r--r--rand/rand_os/src/cloudabi.rs39
-rw-r--r--rand/rand_os/src/dragonfly_haiku_emscripten.rs39
-rw-r--r--rand/rand_os/src/dummy_log.rs10
-rw-r--r--rand/rand_os/src/freebsd.rs45
-rw-r--r--rand/rand_os/src/fuchsia.rs43
-rw-r--r--rand/rand_os/src/lib.rs439
-rw-r--r--rand/rand_os/src/linux_android.rs182
-rw-r--r--rand/rand_os/src/macos.rs53
-rw-r--r--rand/rand_os/src/netbsd.rs54
-rw-r--r--rand/rand_os/src/openbsd_bitrig.rs40
-rw-r--r--rand/rand_os/src/random_device.rs70
-rw-r--r--rand/rand_os/src/redox.rs30
-rw-r--r--rand/rand_os/src/sgx.rs38
-rw-r--r--rand/rand_os/src/solaris.rs175
-rw-r--r--rand/rand_os/src/wasm32_bindgen.rs125
-rw-r--r--rand/rand_os/src/wasm32_stdweb.rs107
-rw-r--r--rand/rand_os/src/windows.rs44
17 files changed, 1533 insertions, 0 deletions
diff --git a/rand/rand_os/src/cloudabi.rs b/rand/rand_os/src/cloudabi.rs
new file mode 100644
index 0000000..8b96a2b
--- /dev/null
+++ b/rand/rand_os/src/cloudabi.rs
@@ -0,0 +1,39 @@
+// Copyright 2018 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Implementation for CloudABI
+
+extern crate cloudabi;
+
+use std::io;
+use rand_core::{Error, ErrorKind};
+use super::OsRngImpl;
+
+#[derive(Clone, Debug)]
+pub struct OsRng;
+
+impl OsRngImpl for OsRng {
+ fn new() -> Result<OsRng, Error> { Ok(OsRng) }
+
+ fn fill_chunk(&mut self, dest: &mut [u8]) -> Result<(), Error> {
+ let errno = unsafe { cloudabi::random_get(dest) };
+ if errno == cloudabi::errno::SUCCESS {
+ Ok(())
+ } else {
+ // Cloudlibc provides its own `strerror` implementation so we
+ // can use `from_raw_os_error` here.
+ Err(Error::with_cause(
+ ErrorKind::Unavailable,
+ "random_get() system call failed",
+ io::Error::from_raw_os_error(errno as i32),
+ ))
+ }
+ }
+
+ fn method_str(&self) -> &'static str { "cloudabi::random_get" }
+}
diff --git a/rand/rand_os/src/dragonfly_haiku_emscripten.rs b/rand/rand_os/src/dragonfly_haiku_emscripten.rs
new file mode 100644
index 0000000..6132d7a
--- /dev/null
+++ b/rand/rand_os/src/dragonfly_haiku_emscripten.rs
@@ -0,0 +1,39 @@
+// Copyright 2018 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Implementation for DragonFly / Haiku / Emscripten
+
+use rand_core::Error;
+use super::random_device;
+use super::OsRngImpl;
+use std::fs::File;
+
+#[derive(Clone, Debug)]
+pub struct OsRng();
+
+impl OsRngImpl for OsRng {
+ fn new() -> Result<OsRng, Error> {
+ random_device::open("/dev/random", &|p| File::open(p))?;
+ Ok(OsRng())
+ }
+
+ fn fill_chunk(&mut self, dest: &mut [u8]) -> Result<(), Error> {
+ random_device::read(dest)
+ }
+
+ #[cfg(target_os = "emscripten")]
+ fn max_chunk_size(&self) -> usize {
+ // `Crypto.getRandomValues` documents `dest` should be at most 65536
+ // bytes. `crypto.randomBytes` documents: "To minimize threadpool
+ // task length variation, partition large randomBytes requests when
+ // doing so as part of fulfilling a client request.
+ 65536
+ }
+
+ fn method_str(&self) -> &'static str { "/dev/random" }
+}
diff --git a/rand/rand_os/src/dummy_log.rs b/rand/rand_os/src/dummy_log.rs
new file mode 100644
index 0000000..ccfe4ba
--- /dev/null
+++ b/rand/rand_os/src/dummy_log.rs
@@ -0,0 +1,10 @@
+#[allow(unused)]
+macro_rules! trace { ($($x:tt)*) => () }
+#[allow(unused)]
+macro_rules! debug { ($($x:tt)*) => () }
+#[allow(unused)]
+macro_rules! info { ($($x:tt)*) => () }
+#[allow(unused)]
+macro_rules! warn { ($($x:tt)*) => () }
+#[allow(unused)]
+macro_rules! error { ($($x:tt)*) => () }
diff --git a/rand/rand_os/src/freebsd.rs b/rand/rand_os/src/freebsd.rs
new file mode 100644
index 0000000..6b8e672
--- /dev/null
+++ b/rand/rand_os/src/freebsd.rs
@@ -0,0 +1,45 @@
+// Copyright 2018 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Implementation for FreeBSD
+
+extern crate libc;
+
+use rand_core::{Error, ErrorKind};
+use super::OsRngImpl;
+
+use std::ptr;
+use std::io;
+
+#[derive(Clone, Debug)]
+pub struct OsRng;
+
+impl OsRngImpl for OsRng {
+ fn new() -> Result<OsRng, Error> { Ok(OsRng) }
+
+ fn fill_chunk(&mut self, dest: &mut [u8]) -> Result<(), Error> {
+ let mib = [libc::CTL_KERN, libc::KERN_ARND];
+ let mut len = dest.len();
+ let ret = unsafe {
+ libc::sysctl(mib.as_ptr(), mib.len() as libc::c_uint,
+ dest.as_mut_ptr() as *mut _, &mut len,
+ ptr::null(), 0)
+ };
+ if ret == -1 || len != dest.len() {
+ return Err(Error::with_cause(
+ ErrorKind::Unavailable,
+ "kern.arandom sysctl failed",
+ io::Error::last_os_error()));
+ }
+ Ok(())
+ }
+
+ fn max_chunk_size(&self) -> usize { 256 }
+
+ fn method_str(&self) -> &'static str { "kern.arandom" }
+}
diff --git a/rand/rand_os/src/fuchsia.rs b/rand/rand_os/src/fuchsia.rs
new file mode 100644
index 0000000..7063ff6
--- /dev/null
+++ b/rand/rand_os/src/fuchsia.rs
@@ -0,0 +1,43 @@
+// Copyright 2018 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Implementation for Fuchsia Zircon
+
+extern crate fuchsia_zircon;
+
+use rand_core::{Error, ErrorKind};
+use super::OsRngImpl;
+
+#[derive(Clone, Debug)]
+pub struct OsRng;
+
+impl OsRngImpl for OsRng {
+ fn new() -> Result<OsRng, Error> { Ok(OsRng) }
+
+ fn fill_chunk(&mut self, dest: &mut [u8]) -> Result<(), Error> {
+ let mut read = 0;
+ while read < dest.len() {
+ match fuchsia_zircon::cprng_draw(&mut dest[read..]) {
+ Ok(actual) => read += actual,
+ Err(e) => {
+ return Err(Error::with_cause(
+ ErrorKind::Unavailable,
+ "cprng_draw failed",
+ e.into_io_error()));
+ }
+ };
+ }
+ Ok(())
+ }
+
+ fn max_chunk_size(&self) -> usize {
+ fuchsia_zircon::sys::ZX_CPRNG_DRAW_MAX_LEN
+ }
+
+ fn method_str(&self) -> &'static str { "cprng_draw" }
+}
diff --git a/rand/rand_os/src/lib.rs b/rand/rand_os/src/lib.rs
new file mode 100644
index 0000000..67b0dfe
--- /dev/null
+++ b/rand/rand_os/src/lib.rs
@@ -0,0 +1,439 @@
+// Copyright 2018 Developers of the Rand project.
+// Copyright 2013-2015 The Rust Project Developers.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Interface to the random number generator of the operating system.
+//!
+//! `OsRng` is the preferred external source of entropy for most applications.
+//! Commonly it is used to initialize a user-space RNG, which can then be used
+//! to generate random values with much less overhead than `OsRng`.
+//!
+//! You may prefer to use [`EntropyRng`] instead of `OsRng`. It is unlikely, but
+//! not entirely theoretical, for `OsRng` to fail. In such cases [`EntropyRng`]
+//! falls back on a good alternative entropy source.
+//!
+//! `OsRng::new()` is guaranteed to be very cheap (after the first successful
+//! call), and will never consume more than one file handle per process.
+//!
+//! # Usage example
+//! ```
+//! use rand_os::OsRng;
+//! use rand_os::rand_core::RngCore;
+//!
+//! let mut os_rng = OsRng::new().unwrap();
+//! let mut key = [0u8; 16];
+//! os_rng.fill_bytes(&mut key);
+//! let random_u64 = os_rng.next_u64();
+//! ```
+//!
+//! # Platform sources
+//!
+//! | OS | interface
+//! |------------------|---------------------------------------------------------
+//! | Linux, Android | [`getrandom`][1] system call if available, otherwise [`/dev/urandom`][2] after reading from `/dev/random` once
+//! | Windows | [`RtlGenRandom`][3]
+//! | macOS, iOS | [`SecRandomCopyBytes`][4]
+//! | FreeBSD | [`kern.arandom`][5]
+//! | OpenBSD, Bitrig | [`getentropy`][6]
+//! | NetBSD | [`/dev/urandom`][7] after reading from `/dev/random` once
+//! | Dragonfly BSD | [`/dev/random`][8]
+//! | Solaris, illumos | [`getrandom`][9] system call if available, otherwise [`/dev/random`][10]
+//! | Fuchsia OS | [`cprng_draw`][11]
+//! | Redox | [`rand:`][12]
+//! | CloudABI | [`random_get`][13]
+//! | Haiku | `/dev/random` (identical to `/dev/urandom`)
+//! | Web browsers | [`Crypto.getRandomValues`][14] (see [Support for WebAssembly and ams.js][14])
+//! | Node.js | [`crypto.randomBytes`][15] (see [Support for WebAssembly and ams.js][16])
+//!
+//! Rand doesn't have a blanket implementation for all Unix-like operating
+//! systems that reads from `/dev/urandom`. This ensures all supported operating
+//! systems are using the recommended interface and respect maximum buffer
+//! sizes.
+//!
+//! ## Support for WebAssembly and ams.js
+//!
+//! The three Emscripten targets `asmjs-unknown-emscripten`,
+//! `wasm32-unknown-emscripten` and `wasm32-experimental-emscripten` use
+//! Emscripten's emulation of `/dev/random` on web browsers and Node.js.
+//!
+//! The bare WASM target `wasm32-unknown-unknown` tries to call the javascript
+//! methods directly, using either `stdweb` or `wasm-bindgen` depending on what
+//! features are activated for this crate. Note that if both features are
+//! enabled `wasm-bindgen` will be used.
+//!
+//! ## Early boot
+//!
+//! It is possible that early in the boot process the OS hasn't had enough time
+//! yet to collect entropy to securely seed its RNG, especially on virtual
+//! machines.
+//!
+//! Some operating systems always block the thread until the RNG is securely
+//! seeded. This can take anywhere from a few seconds to more than a minute.
+//! Others make a best effort to use a seed from before the shutdown and don't
+//! document much.
+//!
+//! A few, Linux, NetBSD and Solaris, offer a choice between blocking, and
+//! getting an error. With `try_fill_bytes` we choose to get the error
+//! ([`ErrorKind::NotReady`]), while the other methods use a blocking interface.
+//!
+//! On Linux (when the `genrandom` system call is not available) and on NetBSD
+//! reading from `/dev/urandom` never blocks, even when the OS hasn't collected
+//! enough entropy yet. As a countermeasure we try to do a single read from
+//! `/dev/random` until we know the OS RNG is initialized (and store this in a
+//! global static).
+//!
+//! # Panics and error handling
+//!
+//! We cannot guarantee that `OsRng` will fail, but if it does, it will likely
+//! be either when `OsRng::new()` is first called or when data is first read.
+//! If you wish to catch errors early, then test reading of at least one byte
+//! from `OsRng` via [`try_fill_bytes`]. If this succeeds, it is extremely
+//! unlikely that any further errors will occur.
+//!
+//! Only [`try_fill_bytes`] is able to report the cause of an error; the other
+//! [`RngCore`] methods may (depending on the error kind) retry several times,
+//! but must eventually panic if the error persists.
+//!
+//! [`EntropyRng`]: ../rand/rngs/struct.EntropyRng.html
+//! [`RngCore`]: ../rand_core/trait.RngCore.html
+//! [`try_fill_bytes`]: ../rand_core/trait.RngCore.html#method.tymethod.try_fill_bytes
+//! [`ErrorKind::NotReady`]: ../rand_core/enum.ErrorKind.html#variant.NotReady
+//!
+//! [1]: http://man7.org/linux/man-pages/man2/getrandom.2.html
+//! [2]: http://man7.org/linux/man-pages/man4/urandom.4.html
+//! [3]: https://msdn.microsoft.com/en-us/library/windows/desktop/aa387694.aspx
+//! [4]: https://developer.apple.com/documentation/security/1399291-secrandomcopybytes?language=objc
+//! [5]: https://www.freebsd.org/cgi/man.cgi?query=random&sektion=4
+//! [6]: https://man.openbsd.org/getentropy.2
+//! [7]: http://netbsd.gw.com/cgi-bin/man-cgi?random+4+NetBSD-current
+//! [8]: https://leaf.dragonflybsd.org/cgi/web-man?command=random&section=4
+//! [9]: https://docs.oracle.com/cd/E88353_01/html/E37841/getrandom-2.html
+//! [10]: https://docs.oracle.com/cd/E86824_01/html/E54777/random-7d.html
+//! [11]: https://fuchsia.googlesource.com/zircon/+/HEAD/docs/syscalls/cprng_draw.md
+//! [12]: https://github.com/redox-os/randd/blob/master/src/main.rs
+//! [13]: https://github.com/NuxiNL/cloudabi/blob/v0.20/cloudabi.txt#L1826
+//! [14]: https://www.w3.org/TR/WebCryptoAPI/#Crypto-method-getRandomValues
+//! [15]: https://nodejs.org/api/crypto.html#crypto_crypto_randombytes_size_callback
+//! [16]: #support-for-webassembly-and-amsjs
+#![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk.png",
+ html_favicon_url = "https://www.rust-lang.org/favicon.ico",
+ html_root_url = "https://rust-random.github.io/rand/")]
+#![deny(missing_docs)]
+#![deny(missing_debug_implementations)]
+#![doc(test(attr(allow(unused_variables), deny(warnings))))]
+
+#![cfg_attr(feature = "stdweb", recursion_limit="128")]
+
+pub extern crate rand_core;
+#[cfg(feature = "log")]
+#[macro_use] extern crate log;
+
+// We have to do it here because we load macros
+#[cfg(all(target_arch = "wasm32", not(target_os = "emscripten"),
+ feature = "wasm-bindgen"))]
+extern crate wasm_bindgen;
+#[cfg(all(target_arch = "wasm32", not(target_os = "emscripten"),
+ not(feature = "wasm-bindgen"),
+ feature = "stdweb"))]
+#[macro_use] extern crate stdweb;
+
+#[cfg(target_env = "sgx")]
+extern crate rdrand;
+
+#[cfg(not(feature = "log"))]
+#[macro_use]
+mod dummy_log;
+
+use std::fmt;
+use rand_core::{CryptoRng, RngCore, Error, impls};
+
+/// A random number generator that retrieves randomness straight from the
+/// operating system.
+#[derive(Clone)]
+pub struct OsRng(imp::OsRng);
+
+impl fmt::Debug for OsRng {
+ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+ self.0.fmt(f)
+ }
+}
+
+impl OsRng {
+ /// Create a new `OsRng`.
+ pub fn new() -> Result<OsRng, Error> {
+ imp::OsRng::new().map(OsRng)
+ }
+}
+
+impl CryptoRng for OsRng {}
+
+impl RngCore for OsRng {
+ fn next_u32(&mut self) -> u32 {
+ impls::next_u32_via_fill(self)
+ }
+
+ fn next_u64(&mut self) -> u64 {
+ impls::next_u64_via_fill(self)
+ }
+
+ fn fill_bytes(&mut self, dest: &mut [u8]) {
+ use std::{time, thread};
+
+ // We cannot return Err(..), so we try to handle before panicking.
+ const MAX_RETRY_PERIOD: u32 = 10; // max 10s
+ const WAIT_DUR_MS: u32 = 100; // retry every 100ms
+ let wait_dur = time::Duration::from_millis(WAIT_DUR_MS as u64);
+ const RETRY_LIMIT: u32 = (MAX_RETRY_PERIOD * 1000) / WAIT_DUR_MS;
+ const TRANSIENT_RETRIES: u32 = 8;
+ let mut err_count = 0;
+ let mut error_logged = false;
+
+ // Maybe block until the OS RNG is initialized
+ let mut read = 0;
+ if let Ok(n) = self.0.test_initialized(dest, true) { read = n };
+ let dest = &mut dest[read..];
+
+ loop {
+ if let Err(e) = self.try_fill_bytes(dest) {
+ if err_count >= RETRY_LIMIT {
+ error!("OsRng failed too many times; last error: {}", e);
+ panic!("OsRng failed too many times; last error: {}", e);
+ }
+
+ if e.kind.should_wait() {
+ if !error_logged {
+ warn!("OsRng failed; waiting up to {}s and retrying. Error: {}",
+ MAX_RETRY_PERIOD, e);
+ error_logged = true;
+ }
+ err_count += 1;
+ thread::sleep(wait_dur);
+ continue;
+ } else if e.kind.should_retry() {
+ if !error_logged {
+ warn!("OsRng failed; retrying up to {} times. Error: {}",
+ TRANSIENT_RETRIES, e);
+ error_logged = true;
+ }
+ err_count += (RETRY_LIMIT + TRANSIENT_RETRIES - 1)
+ / TRANSIENT_RETRIES; // round up
+ continue;
+ } else {
+ error!("OsRng failed: {}", e);
+ panic!("OsRng fatal error: {}", e);
+ }
+ }
+
+ break;
+ }
+ }
+
+ fn try_fill_bytes(&mut self, dest: &mut [u8]) -> Result<(), Error> {
+ // Some systems do not support reading 0 random bytes.
+ // (And why waste a system call?)
+ if dest.len() == 0 { return Ok(()); }
+
+ let read = self.0.test_initialized(dest, false)?;
+ let dest = &mut dest[read..];
+
+ let max = self.0.max_chunk_size();
+ if dest.len() <= max {
+ trace!("OsRng: reading {} bytes via {}",
+ dest.len(), self.0.method_str());
+ } else {
+ trace!("OsRng: reading {} bytes via {} in {} chunks of {} bytes",
+ dest.len(), self.0.method_str(), (dest.len() + max) / max, max);
+ }
+ for slice in dest.chunks_mut(max) {
+ self.0.fill_chunk(slice)?;
+ }
+ Ok(())
+ }
+}
+
+trait OsRngImpl where Self: Sized {
+ // Create a new `OsRng` platform interface.
+ fn new() -> Result<Self, Error>;
+
+ // Fill a chunk with random bytes.
+ fn fill_chunk(&mut self, dest: &mut [u8]) -> Result<(), Error>;
+
+ // Test whether the OS RNG is initialized. This method may not be possible
+ // to support cheaply (or at all) on all operating systems.
+ //
+ // If `blocking` is set, this will cause the OS the block execution until
+ // its RNG is initialized.
+ //
+ // Random values that are read while this are stored in `dest`, the amount
+ // of read bytes is returned.
+ fn test_initialized(&mut self, _dest: &mut [u8], _blocking: bool)
+ -> Result<usize, Error> { Ok(0) }
+
+ // Maximum chunk size supported.
+ fn max_chunk_size(&self) -> usize { ::std::usize::MAX }
+
+ // Name of the OS interface (used for logging).
+ fn method_str(&self) -> &'static str;
+}
+
+#[cfg(any(target_os = "linux", target_os = "android",
+ target_os = "netbsd", target_os = "dragonfly",
+ target_os = "solaris", target_os = "redox",
+ target_os = "haiku", target_os = "emscripten"))]
+mod random_device;
+
+macro_rules! mod_use {
+ ($cond:meta, $module:ident) => {
+ #[$cond]
+ mod $module;
+ #[$cond]
+ use $module as imp;
+ }
+}
+
+mod_use!(cfg(target_os = "android"), linux_android);
+mod_use!(cfg(target_os = "bitrig"), openbsd_bitrig);
+mod_use!(cfg(target_os = "cloudabi"), cloudabi);
+mod_use!(cfg(target_os = "dragonfly"), dragonfly_haiku_emscripten);
+mod_use!(cfg(target_os = "emscripten"), dragonfly_haiku_emscripten);
+mod_use!(cfg(target_os = "freebsd"), freebsd);
+mod_use!(cfg(target_os = "fuchsia"), fuchsia);
+mod_use!(cfg(target_os = "haiku"), dragonfly_haiku_emscripten);
+mod_use!(cfg(target_os = "ios"), macos);
+mod_use!(cfg(target_os = "linux"), linux_android);
+mod_use!(cfg(target_os = "macos"), macos);
+mod_use!(cfg(target_os = "netbsd"), netbsd);
+mod_use!(cfg(target_os = "openbsd"), openbsd_bitrig);
+mod_use!(cfg(target_os = "redox"), redox);
+mod_use!(cfg(target_os = "solaris"), solaris);
+mod_use!(cfg(windows), windows);
+mod_use!(cfg(target_env = "sgx"), sgx);
+
+mod_use!(
+ cfg(all(
+ target_arch = "wasm32",
+ not(target_os = "emscripten"),
+ feature = "wasm-bindgen"
+ )),
+ wasm32_bindgen
+);
+
+mod_use!(
+ cfg(all(
+ target_arch = "wasm32",
+ not(target_os = "emscripten"),
+ not(feature = "wasm-bindgen"),
+ feature = "stdweb",
+ )),
+ wasm32_stdweb
+);
+
+/// Per #678 we use run-time failure where WASM bindings are missing
+#[cfg(all(
+ target_arch = "wasm32",
+ not(target_os = "emscripten"),
+ not(feature = "wasm-bindgen"),
+ not(feature = "stdweb"),
+))]
+mod imp {
+ use rand_core::{Error, ErrorKind};
+ use super::OsRngImpl;
+
+ #[derive(Clone, Debug)]
+ pub struct OsRng;
+
+ impl OsRngImpl for OsRng {
+ fn new() -> Result<OsRng, Error> {
+ Err(Error::new(ErrorKind::Unavailable,
+ "OsRng: support for wasm32 requires emscripten, stdweb or wasm-bindgen"))
+ }
+
+ fn fill_chunk(&mut self, _dest: &mut [u8]) -> Result<(), Error> {
+ unimplemented!()
+ }
+
+ fn method_str(&self) -> &'static str { unimplemented!() }
+ }
+}
+
+#[cfg(not(any(
+ target_os = "android",
+ target_os = "bitrig",
+ target_os = "cloudabi",
+ target_os = "dragonfly",
+ target_os = "emscripten",
+ target_os = "freebsd",
+ target_os = "fuchsia",
+ target_os = "haiku",
+ target_os = "ios",
+ target_os = "linux",
+ target_os = "macos",
+ target_os = "netbsd",
+ target_os = "openbsd",
+ target_os = "redox",
+ target_os = "solaris",
+ windows,
+ target_arch = "wasm32",
+ target_env = "sgx"
+)))]
+compile_error!("OS RNG support is not available for this platform");
+
+// Due to rustwasm/wasm-bindgen#201 this can't be defined in the inner os
+// modules, so hack around it for now and place it at the root.
+#[cfg(all(feature = "wasm-bindgen", target_arch = "wasm32"))]
+#[doc(hidden)]
+#[allow(missing_debug_implementations)]
+pub mod __wbg_shims {
+
+ // `extern { type Foo; }` isn't supported on 1.22 syntactically, so use a
+ // macro to work around that.
+ macro_rules! rust_122_compat {
+ ($($t:tt)*) => ($($t)*)
+ }
+
+ rust_122_compat! {
+ extern crate wasm_bindgen;
+
+ pub use wasm_bindgen::prelude::*;
+
+ #[wasm_bindgen]
+ extern "C" {
+ pub type Function;
+ #[wasm_bindgen(constructor)]
+ pub fn new(s: &str) -> Function;
+ #[wasm_bindgen(method)]
+ pub fn call(this: &Function, self_: &JsValue) -> JsValue;
+
+ pub type This;
+ #[wasm_bindgen(method, getter, structural, js_name = self)]
+ pub fn self_(me: &This) -> JsValue;
+ #[wasm_bindgen(method, getter, structural)]
+ pub fn crypto(me: &This) -> JsValue;
+
+ #[derive(Clone, Debug)]
+ pub type BrowserCrypto;
+
+ // TODO: these `structural` annotations here ideally wouldn't be here to
+ // avoid a JS shim, but for now with feature detection they're
+ // unavoidable.
+ #[wasm_bindgen(method, js_name = getRandomValues, structural, getter)]
+ pub fn get_random_values_fn(me: &BrowserCrypto) -> JsValue;
+ #[wasm_bindgen(method, js_name = getRandomValues, structural)]
+ pub fn get_random_values(me: &BrowserCrypto, buf: &mut [u8]);
+
+ #[wasm_bindgen(js_name = require)]
+ pub fn node_require(s: &str) -> NodeCrypto;
+
+ #[derive(Clone, Debug)]
+ pub type NodeCrypto;
+
+ #[wasm_bindgen(method, js_name = randomFillSync, structural)]
+ pub fn random_fill_sync(me: &NodeCrypto, buf: &mut [u8]);
+ }
+ }
+}
diff --git a/rand/rand_os/src/linux_android.rs b/rand/rand_os/src/linux_android.rs
new file mode 100644
index 0000000..9622f93
--- /dev/null
+++ b/rand/rand_os/src/linux_android.rs
@@ -0,0 +1,182 @@
+// Copyright 2018 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Implementation for Linux / Android
+
+extern crate libc;
+
+use rand_core::{Error, ErrorKind};
+use super::random_device;
+use super::OsRngImpl;
+
+use std::io;
+use std::io::Read;
+use std::fs::{File, OpenOptions};
+use std::os::unix::fs::OpenOptionsExt;
+use std::sync::atomic::{AtomicBool, ATOMIC_BOOL_INIT, Ordering};
+use std::sync::{Once, ONCE_INIT};
+
+#[derive(Clone, Debug)]
+pub struct OsRng {
+ method: OsRngMethod,
+ initialized: bool,
+}
+
+#[derive(Clone, Debug)]
+enum OsRngMethod {
+ GetRandom,
+ RandomDevice,
+}
+
+impl OsRngImpl for OsRng {
+ fn new() -> Result<OsRng, Error> {
+ if is_getrandom_available() {
+ return Ok(OsRng { method: OsRngMethod::GetRandom,
+ initialized: false });
+ }
+ random_device::open("/dev/urandom", &|p| File::open(p))?;
+ Ok(OsRng { method: OsRngMethod::RandomDevice, initialized: false })
+ }
+
+ fn fill_chunk(&mut self, dest: &mut [u8]) -> Result<(), Error> {
+ match self.method {
+ OsRngMethod::GetRandom => getrandom_try_fill(dest, false),
+ OsRngMethod::RandomDevice => random_device::read(dest),
+ }
+ }
+
+ fn test_initialized(&mut self, dest: &mut [u8], blocking: bool)
+ -> Result<usize, Error>
+ {
+ static OS_RNG_INITIALIZED: AtomicBool = ATOMIC_BOOL_INIT;
+ if !self.initialized {
+ self.initialized = OS_RNG_INITIALIZED.load(Ordering::Relaxed);
+ }
+ if self.initialized { return Ok(0); }
+
+ let result = match self.method {
+ OsRngMethod::GetRandom => {
+ getrandom_try_fill(dest, blocking)?;
+ Ok(dest.len())
+ }
+ OsRngMethod::RandomDevice => {
+ info!("OsRng: testing random device /dev/random");
+ let mut file = OpenOptions::new()
+ .read(true)
+ .custom_flags(if blocking { 0 } else { libc::O_NONBLOCK })
+ .open("/dev/random")
+ .map_err(random_device::map_err)?;
+ file.read(&mut dest[..1]).map_err(random_device::map_err)?;
+ Ok(1)
+ }
+ };
+ OS_RNG_INITIALIZED.store(true, Ordering::Relaxed);
+ self.initialized = true;
+ result
+ }
+
+ fn method_str(&self) -> &'static str {
+ match self.method {
+ OsRngMethod::GetRandom => "getrandom",
+ OsRngMethod::RandomDevice => "/dev/urandom",
+ }
+ }
+}
+
+#[cfg(target_arch = "x86_64")]
+const NR_GETRANDOM: libc::c_long = 318;
+#[cfg(target_arch = "x86")]
+const NR_GETRANDOM: libc::c_long = 355;
+#[cfg(target_arch = "arm")]
+const NR_GETRANDOM: libc::c_long = 384;
+#[cfg(target_arch = "aarch64")]
+const NR_GETRANDOM: libc::c_long = 278;
+ #[cfg(target_arch = "s390x")]
+const NR_GETRANDOM: libc::c_long = 349;
+#[cfg(target_arch = "powerpc")]
+const NR_GETRANDOM: libc::c_long = 359;
+#[cfg(target_arch = "powerpc64")]
+const NR_GETRANDOM: libc::c_long = 359;
+#[cfg(target_arch = "mips")] // old ABI
+const NR_GETRANDOM: libc::c_long = 4353;
+#[cfg(target_arch = "mips64")]
+const NR_GETRANDOM: libc::c_long = 5313;
+#[cfg(target_arch = "sparc")]
+const NR_GETRANDOM: libc::c_long = 347;
+#[cfg(target_arch = "sparc64")]
+const NR_GETRANDOM: libc::c_long = 347;
+#[cfg(not(any(target_arch = "x86_64", target_arch = "x86",
+ target_arch = "arm", target_arch = "aarch64",
+ target_arch = "s390x", target_arch = "powerpc",
+ target_arch = "powerpc64", target_arch = "mips",
+ target_arch = "mips64", target_arch = "sparc",
+ target_arch = "sparc64")))]
+const NR_GETRANDOM: libc::c_long = 0;
+
+fn getrandom(buf: &mut [u8], blocking: bool) -> libc::c_long {
+ const GRND_NONBLOCK: libc::c_uint = 0x0001;
+
+ if NR_GETRANDOM == 0 { return -1 };
+
+ unsafe {
+ libc::syscall(NR_GETRANDOM, buf.as_mut_ptr(), buf.len(),
+ if blocking { 0 } else { GRND_NONBLOCK })
+ }
+}
+
+fn getrandom_try_fill(dest: &mut [u8], blocking: bool) -> Result<(), Error> {
+ let mut read = 0;
+ while read < dest.len() {
+ let result = getrandom(&mut dest[read..], blocking);
+ if result == -1 {
+ let err = io::Error::last_os_error();
+ let kind = err.kind();
+ if kind == io::ErrorKind::Interrupted {
+ continue;
+ } else if kind == io::ErrorKind::WouldBlock {
+ return Err(Error::with_cause(
+ ErrorKind::NotReady,
+ "getrandom not ready",
+ err,
+ ));
+ } else {
+ return Err(Error::with_cause(
+ ErrorKind::Unavailable,
+ "unexpected getrandom error",
+ err,
+ ));
+ }
+ } else {
+ read += result as usize;
+ }
+ }
+ Ok(())
+}
+
+fn is_getrandom_available() -> bool {
+ static CHECKER: Once = ONCE_INIT;
+ static AVAILABLE: AtomicBool = ATOMIC_BOOL_INIT;
+
+ if NR_GETRANDOM == 0 { return false };
+
+ CHECKER.call_once(|| {
+ debug!("OsRng: testing getrandom");
+ let mut buf: [u8; 0] = [];
+ let result = getrandom(&mut buf, false);
+ let available = if result == -1 {
+ let err = io::Error::last_os_error().raw_os_error();
+ err != Some(libc::ENOSYS)
+ } else {
+ true
+ };
+ AVAILABLE.store(available, Ordering::Relaxed);
+ info!("OsRng: using {}", if available { "getrandom" } else { "/dev/urandom" });
+ });
+
+ AVAILABLE.load(Ordering::Relaxed)
+}
diff --git a/rand/rand_os/src/macos.rs b/rand/rand_os/src/macos.rs
new file mode 100644
index 0000000..6c67251
--- /dev/null
+++ b/rand/rand_os/src/macos.rs
@@ -0,0 +1,53 @@
+// Copyright 2018 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Implementation for MacOS / iOS
+
+extern crate libc;
+
+use rand_core::{Error, ErrorKind};
+use super::OsRngImpl;
+
+use std::io;
+use self::libc::{c_int, size_t};
+
+#[derive(Clone, Debug)]
+pub struct OsRng;
+
+enum SecRandom {}
+
+#[allow(non_upper_case_globals)]
+const kSecRandomDefault: *const SecRandom = 0 as *const SecRandom;
+
+#[link(name = "Security", kind = "framework")]
+extern {
+ fn SecRandomCopyBytes(rnd: *const SecRandom,
+ count: size_t, bytes: *mut u8) -> c_int;
+}
+
+impl OsRngImpl for OsRng {
+ fn new() -> Result<OsRng, Error> { Ok(OsRng) }
+
+ fn fill_chunk(&mut self, dest: &mut [u8]) -> Result<(), Error> {
+ let ret = unsafe {
+ SecRandomCopyBytes(kSecRandomDefault,
+ dest.len() as size_t,
+ dest.as_mut_ptr())
+ };
+ if ret == -1 {
+ Err(Error::with_cause(
+ ErrorKind::Unavailable,
+ "couldn't generate random bytes",
+ io::Error::last_os_error()))
+ } else {
+ Ok(())
+ }
+ }
+
+ fn method_str(&self) -> &'static str { "SecRandomCopyBytes" }
+}
diff --git a/rand/rand_os/src/netbsd.rs b/rand/rand_os/src/netbsd.rs
new file mode 100644
index 0000000..cf4b6c7
--- /dev/null
+++ b/rand/rand_os/src/netbsd.rs
@@ -0,0 +1,54 @@
+// Copyright 2018 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Implementation for NetBSD
+
+use rand_core::Error;
+use super::random_device;
+use super::OsRngImpl;
+
+use std::fs::File;
+use std::io::Read;
+use std::sync::atomic::{AtomicBool, ATOMIC_BOOL_INIT, Ordering};
+
+#[derive(Clone, Debug)]
+pub struct OsRng { initialized: bool }
+
+impl OsRngImpl for OsRng {
+ fn new() -> Result<OsRng, Error> {
+ random_device::open("/dev/urandom", &|p| File::open(p))?;
+ Ok(OsRng { initialized: false })
+ }
+
+ fn fill_chunk(&mut self, dest: &mut [u8]) -> Result<(), Error> {
+ random_device::read(dest)
+ }
+
+ // Read a single byte from `/dev/random` to determine if the OS RNG is
+ // already seeded. NetBSD always blocks if not yet ready.
+ fn test_initialized(&mut self, dest: &mut [u8], _blocking: bool)
+ -> Result<usize, Error>
+ {
+ static OS_RNG_INITIALIZED: AtomicBool = ATOMIC_BOOL_INIT;
+ if !self.initialized {
+ self.initialized = OS_RNG_INITIALIZED.load(Ordering::Relaxed);
+ }
+ if self.initialized { return Ok(0); }
+
+ info!("OsRng: testing random device /dev/random");
+ let mut file =
+ File::open("/dev/random").map_err(random_device::map_err)?;
+ file.read(&mut dest[..1]).map_err(random_device::map_err)?;
+
+ OS_RNG_INITIALIZED.store(true, Ordering::Relaxed);
+ self.initialized = true;
+ Ok(1)
+ }
+
+ fn method_str(&self) -> &'static str { "/dev/urandom" }
+}
diff --git a/rand/rand_os/src/openbsd_bitrig.rs b/rand/rand_os/src/openbsd_bitrig.rs
new file mode 100644
index 0000000..c9b35a6
--- /dev/null
+++ b/rand/rand_os/src/openbsd_bitrig.rs
@@ -0,0 +1,40 @@
+// Copyright 2018 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Implementation for OpenBSD / Bitrig
+
+extern crate libc;
+
+use rand_core::{Error, ErrorKind};
+use super::OsRngImpl;
+
+use std::io;
+
+#[derive(Clone, Debug)]
+pub struct OsRng;
+
+impl OsRngImpl for OsRng {
+ fn new() -> Result<OsRng, Error> { Ok(OsRng) }
+
+ fn fill_chunk(&mut self, dest: &mut [u8]) -> Result<(), Error> {
+ let ret = unsafe {
+ libc::getentropy(dest.as_mut_ptr() as *mut libc::c_void, dest.len())
+ };
+ if ret == -1 {
+ return Err(Error::with_cause(
+ ErrorKind::Unavailable,
+ "getentropy failed",
+ io::Error::last_os_error()));
+ }
+ Ok(())
+ }
+
+ fn max_chunk_size(&self) -> usize { 256 }
+
+ fn method_str(&self) -> &'static str { "getentropy" }
+}
diff --git a/rand/rand_os/src/random_device.rs b/rand/rand_os/src/random_device.rs
new file mode 100644
index 0000000..5da9194
--- /dev/null
+++ b/rand/rand_os/src/random_device.rs
@@ -0,0 +1,70 @@
+// Copyright 2018 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Helper functions to read from a random device such as `/dev/urandom`.
+//!
+//! All instances use a single internal file handle, to prevent possible
+//! exhaustion of file descriptors.
+use rand_core::{Error, ErrorKind};
+use std::fs::File;
+use std::io;
+use std::io::Read;
+use std::sync::{Once, Mutex, ONCE_INIT};
+
+// TODO: remove outer Option when `Mutex::new(None)` is a constant expression
+static mut READ_RNG_FILE: Option<Mutex<Option<File>>> = None;
+static READ_RNG_ONCE: Once = ONCE_INIT;
+
+#[allow(unused)]
+pub fn open<F>(path: &'static str, open_fn: F) -> Result<(), Error>
+ where F: Fn(&'static str) -> Result<File, io::Error>
+{
+ READ_RNG_ONCE.call_once(|| {
+ unsafe { READ_RNG_FILE = Some(Mutex::new(None)) }
+ });
+
+ // We try opening the file outside the `call_once` fn because we cannot
+ // clone the error, thus we must retry on failure.
+
+ let mutex = unsafe { READ_RNG_FILE.as_ref().unwrap() };
+ let mut guard = mutex.lock().unwrap();
+ if (*guard).is_none() {
+ info!("OsRng: opening random device {}", path);
+ let file = open_fn(path).map_err(map_err)?;
+ *guard = Some(file);
+ };
+ Ok(())
+}
+
+pub fn read(dest: &mut [u8]) -> Result<(), Error> {
+ // We expect this function only to be used after `random_device::open`
+ // was succesful. Therefore we can assume that our memory was set with a
+ // valid object.
+ let mutex = unsafe { READ_RNG_FILE.as_ref().unwrap() };
+ let mut guard = mutex.lock().unwrap();
+ let file = (*guard).as_mut().unwrap();
+
+ // Use `std::io::read_exact`, which retries on `ErrorKind::Interrupted`.
+ file.read_exact(dest).map_err(|err| {
+ Error::with_cause(ErrorKind::Unavailable,
+ "error reading random device", err)
+ })
+
+}
+
+pub fn map_err(err: io::Error) -> Error {
+ match err.kind() {
+ io::ErrorKind::Interrupted =>
+ Error::new(ErrorKind::Transient, "interrupted"),
+ io::ErrorKind::WouldBlock =>
+ Error::with_cause(ErrorKind::NotReady,
+ "OS RNG not yet seeded", err),
+ _ => Error::with_cause(ErrorKind::Unavailable,
+ "error while opening random device", err)
+ }
+}
diff --git a/rand/rand_os/src/redox.rs b/rand/rand_os/src/redox.rs
new file mode 100644
index 0000000..36fae26
--- /dev/null
+++ b/rand/rand_os/src/redox.rs
@@ -0,0 +1,30 @@
+// Copyright 2018 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Implementation for Redox
+
+use rand_core::Error;
+use super::random_device;
+use super::OsRngImpl;
+use std::fs::File;
+
+#[derive(Clone, Debug)]
+pub struct OsRng();
+
+impl OsRngImpl for OsRng {
+ fn new() -> Result<OsRng, Error> {
+ random_device::open("rand:", &|p| File::open(p))?;
+ Ok(OsRng())
+ }
+
+ fn fill_chunk(&mut self, dest: &mut [u8]) -> Result<(), Error> {
+ random_device::read(dest)
+ }
+
+ fn method_str(&self) -> &'static str { "'rand:'" }
+}
diff --git a/rand/rand_os/src/sgx.rs b/rand/rand_os/src/sgx.rs
new file mode 100644
index 0000000..43ae0ef
--- /dev/null
+++ b/rand/rand_os/src/sgx.rs
@@ -0,0 +1,38 @@
+// Copyright 2018 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use super::OsRngImpl;
+use Error;
+use rdrand::RdRand;
+use rand_core::RngCore;
+use std::fmt::{Debug, Formatter, Result as FmtResult};
+
+#[derive(Clone)]
+pub struct OsRng{
+ gen: RdRand
+}
+
+impl OsRngImpl for OsRng {
+ fn new() -> Result<OsRng, Error> {
+ let rng = RdRand::new()?;
+ Ok(OsRng{ gen: rng })
+ }
+
+ fn fill_chunk(&mut self, dest: &mut [u8]) -> Result<(), Error> {
+ self.gen.try_fill_bytes(dest)
+ }
+
+ fn method_str(&self) -> &'static str { "RDRAND" }
+}
+
+impl Debug for OsRng {
+ fn fmt(&self, f: &mut Formatter) -> FmtResult {
+ f.debug_struct("OsRng")
+ .finish()
+ }
+}
diff --git a/rand/rand_os/src/solaris.rs b/rand/rand_os/src/solaris.rs
new file mode 100644
index 0000000..e8965fd
--- /dev/null
+++ b/rand/rand_os/src/solaris.rs
@@ -0,0 +1,175 @@
+// Copyright 2018 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Implementation for the Solaris family
+//!
+//! Read from `/dev/random`, with chunks of limited size (1040 bytes).
+//! `/dev/random` uses the Hash_DRBG with SHA512 algorithm from NIST SP 800-90A.
+//! `/dev/urandom` uses the FIPS 186-2 algorithm, which is considered less
+//! secure. We choose to read from `/dev/random`.
+//!
+//! Since Solaris 11.3 the `getrandom` syscall is available. To make sure we can
+//! compile on both Solaris and on OpenSolaris derivatives, that do not have the
+//! function, we do a direct syscall instead of calling a library function.
+//!
+//! We have no way to differentiate between Solaris, illumos, SmartOS, etc.
+extern crate libc;
+
+use rand_core::{Error, ErrorKind};
+use super::random_device;
+use super::OsRngImpl;
+
+use std::io;
+use std::io::Read;
+use std::fs::{File, OpenOptions};
+use std::os::unix::fs::OpenOptionsExt;
+use std::sync::atomic::{AtomicBool, ATOMIC_BOOL_INIT, Ordering};
+use std::cmp;
+
+#[derive(Clone, Debug)]
+pub struct OsRng {
+ method: OsRngMethod,
+ initialized: bool,
+}
+
+#[derive(Clone, Debug)]
+enum OsRngMethod {
+ GetRandom,
+ RandomDevice,
+}
+
+impl OsRngImpl for OsRng {
+ fn new() -> Result<OsRng, Error> {
+ if is_getrandom_available() {
+ return Ok(OsRng { method: OsRngMethod::GetRandom,
+ initialized: false });
+ }
+ let open = |p| OpenOptions::new()
+ .read(true)
+ .custom_flags(libc::O_NONBLOCK)
+ .open(p);
+ random_device::open("/dev/random", &open)?;
+ Ok(OsRng { method: OsRngMethod::RandomDevice, initialized: false })
+ }
+
+ fn fill_chunk(&mut self, dest: &mut [u8]) -> Result<(), Error> {
+ match self.method {
+ OsRngMethod::GetRandom => getrandom_try_fill(dest, false),
+ OsRngMethod::RandomDevice => random_device::read(dest),
+ }
+ }
+
+ fn test_initialized(&mut self, dest: &mut [u8], blocking: bool)
+ -> Result<usize, Error>
+ {
+ static OS_RNG_INITIALIZED: AtomicBool = ATOMIC_BOOL_INIT;
+ if !self.initialized {
+ self.initialized = OS_RNG_INITIALIZED.load(Ordering::Relaxed);
+ }
+ if self.initialized { return Ok(0); }
+
+ let chunk_len = cmp::min(1024, dest.len());
+ let dest = &mut dest[..chunk_len];
+
+ match self.method {
+ OsRngMethod::GetRandom => getrandom_try_fill(dest, blocking)?,
+ OsRngMethod::RandomDevice => {
+ if blocking {
+ info!("OsRng: testing random device /dev/random");
+ // We already have a non-blocking handle, but now need a
+ // blocking one. Not much choice except opening it twice
+ let mut file = File::open("/dev/random")
+ .map_err(random_device::map_err)?;
+ file.read(dest).map_err(random_device::map_err)?;
+ } else {
+ self.fill_chunk(dest)?;
+ }
+ }
+ };
+ OS_RNG_INITIALIZED.store(true, Ordering::Relaxed);
+ self.initialized = true;
+ Ok(chunk_len)
+ }
+
+ fn max_chunk_size(&self) -> usize {
+ // The documentation says 1024 is the maximum for getrandom, but
+ // 1040 for /dev/random.
+ 1024
+ }
+
+ fn method_str(&self) -> &'static str {
+ match self.method {
+ OsRngMethod::GetRandom => "getrandom",
+ OsRngMethod::RandomDevice => "/dev/random",
+ }
+ }
+}
+
+fn getrandom(buf: &mut [u8], blocking: bool) -> libc::c_long {
+ extern "C" {
+ fn syscall(number: libc::c_long, ...) -> libc::c_long;
+ }
+
+ const SYS_GETRANDOM: libc::c_long = 143;
+ const GRND_NONBLOCK: libc::c_uint = 0x0001;
+ const GRND_RANDOM: libc::c_uint = 0x0002;
+
+ unsafe {
+ syscall(SYS_GETRANDOM, buf.as_mut_ptr(), buf.len(),
+ if blocking { 0 } else { GRND_NONBLOCK } | GRND_RANDOM)
+ }
+}
+
+fn getrandom_try_fill(dest: &mut [u8], blocking: bool) -> Result<(), Error> {
+ let result = getrandom(dest, blocking);
+ if result == -1 || result == 0 {
+ let err = io::Error::last_os_error();
+ let kind = err.kind();
+ if kind == io::ErrorKind::WouldBlock {
+ return Err(Error::with_cause(
+ ErrorKind::NotReady,
+ "getrandom not ready",
+ err,
+ ));
+ } else {
+ return Err(Error::with_cause(
+ ErrorKind::Unavailable,
+ "unexpected getrandom error",
+ err,
+ ));
+ }
+ } else if result != dest.len() as i64 {
+ return Err(Error::new(ErrorKind::Unavailable,
+ "unexpected getrandom error"));
+ }
+ Ok(())
+}
+
+fn is_getrandom_available() -> bool {
+ use std::sync::atomic::{AtomicBool, ATOMIC_BOOL_INIT, Ordering};
+ use std::sync::{Once, ONCE_INIT};
+
+ static CHECKER: Once = ONCE_INIT;
+ static AVAILABLE: AtomicBool = ATOMIC_BOOL_INIT;
+
+ CHECKER.call_once(|| {
+ debug!("OsRng: testing getrandom");
+ let mut buf: [u8; 0] = [];
+ let result = getrandom(&mut buf, false);
+ let available = if result == -1 {
+ let err = io::Error::last_os_error().raw_os_error();
+ err != Some(libc::ENOSYS)
+ } else {
+ true
+ };
+ AVAILABLE.store(available, Ordering::Relaxed);
+ info!("OsRng: using {}", if available { "getrandom" } else { "/dev/random" });
+ });
+
+ AVAILABLE.load(Ordering::Relaxed)
+}
diff --git a/rand/rand_os/src/wasm32_bindgen.rs b/rand/rand_os/src/wasm32_bindgen.rs
new file mode 100644
index 0000000..8e7c979
--- /dev/null
+++ b/rand/rand_os/src/wasm32_bindgen.rs
@@ -0,0 +1,125 @@
+// Copyright 2018 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Implementation for WASM via wasm-bindgen
+
+use rand_core::{Error, ErrorKind};
+use super::OsRngImpl;
+
+use wasm_bindgen::prelude::*;
+
+#[wasm_bindgen]
+extern "C" {
+ pub type Function;
+ #[wasm_bindgen(constructor)]
+ pub fn new(s: &str) -> Function;
+ #[wasm_bindgen(method)]
+ pub fn call(this: &Function, self_: &JsValue) -> JsValue;
+
+ pub type This;
+ #[wasm_bindgen(method, getter, structural, js_name = self)]
+ pub fn self_(me: &This) -> JsValue;
+ #[wasm_bindgen(method, getter, structural)]
+ pub fn crypto(me: &This) -> JsValue;
+
+ #[derive(Clone, Debug)]
+ pub type BrowserCrypto;
+
+ // TODO: these `structural` annotations here ideally wouldn't be here to
+ // avoid a JS shim, but for now with feature detection they're
+ // unavoidable.
+ #[wasm_bindgen(method, js_name = getRandomValues, structural, getter)]
+ pub fn get_random_values_fn(me: &BrowserCrypto) -> JsValue;
+ #[wasm_bindgen(method, js_name = getRandomValues, structural)]
+ pub fn get_random_values(me: &BrowserCrypto, buf: &mut [u8]);
+
+ #[wasm_bindgen(js_name = require)]
+ pub fn node_require(s: &str) -> NodeCrypto;
+
+ #[derive(Clone, Debug)]
+ pub type NodeCrypto;
+
+ #[wasm_bindgen(method, js_name = randomFillSync, structural)]
+ pub fn random_fill_sync(me: &NodeCrypto, buf: &mut [u8]);
+}
+
+#[derive(Clone, Debug)]
+pub enum OsRng {
+ Node(NodeCrypto),
+ Browser(BrowserCrypto),
+}
+
+impl OsRngImpl for OsRng {
+ fn new() -> Result<OsRng, Error> {
+ // First up we need to detect if we're running in node.js or a
+ // browser. To do this we get ahold of the `this` object (in a bit
+ // of a roundabout fashion).
+ //
+ // Once we have `this` we look at its `self` property, which is
+ // only defined on the web (either a main window or web worker).
+ let this = Function::new("return this").call(&JsValue::undefined());
+ assert!(this != JsValue::undefined());
+ let this = This::from(this);
+ let is_browser = this.self_() != JsValue::undefined();
+
+ if !is_browser {
+ return Ok(OsRng::Node(node_require("crypto")))
+ }
+
+ // If `self` is defined then we're in a browser somehow (main window
+ // or web worker). Here we want to try to use
+ // `crypto.getRandomValues`, but if `crypto` isn't defined we assume
+ // we're in an older web browser and the OS RNG isn't available.
+ let crypto = this.crypto();
+ if crypto.is_undefined() {
+ let msg = "self.crypto is undefined";
+ return Err(Error::new(ErrorKind::Unavailable, msg))
+ }
+
+ // Test if `crypto.getRandomValues` is undefined as well
+ let crypto: BrowserCrypto = crypto.into();
+ if crypto.get_random_values_fn().is_undefined() {
+ let msg = "crypto.getRandomValues is undefined";
+ return Err(Error::new(ErrorKind::Unavailable, msg))
+ }
+
+ // Ok! `self.crypto.getRandomValues` is a defined value, so let's
+ // assume we can do browser crypto.
+ Ok(OsRng::Browser(crypto))
+ }
+
+ fn fill_chunk(&mut self, dest: &mut [u8]) -> Result<(), Error> {
+ match *self {
+ OsRng::Node(ref n) => n.random_fill_sync(dest),
+ OsRng::Browser(ref n) => n.get_random_values(dest),
+ }
+ Ok(())
+ }
+
+ fn max_chunk_size(&self) -> usize {
+ match *self {
+ OsRng::Node(_) => usize::max_value(),
+ OsRng::Browser(_) => {
+ // see https://developer.mozilla.org/en-US/docs/Web/API/Crypto/getRandomValues
+ //
+ // where it says:
+ //
+ // > A QuotaExceededError DOMException is thrown if the
+ // > requested length is greater than 65536 bytes.
+ 65536
+ }
+ }
+ }
+
+ fn method_str(&self) -> &'static str {
+ match *self {
+ OsRng::Node(_) => "crypto.randomFillSync",
+ OsRng::Browser(_) => "crypto.getRandomValues",
+ }
+ }
+}
diff --git a/rand/rand_os/src/wasm32_stdweb.rs b/rand/rand_os/src/wasm32_stdweb.rs
new file mode 100644
index 0000000..3be0ce6
--- /dev/null
+++ b/rand/rand_os/src/wasm32_stdweb.rs
@@ -0,0 +1,107 @@
+// Copyright 2018 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Implementation for WASM via stdweb
+
+use std::mem;
+use stdweb::unstable::TryInto;
+use stdweb::web::error::Error as WebError;
+use rand_core::{Error, ErrorKind};
+use super::OsRngImpl;
+
+#[derive(Clone, Debug)]
+enum OsRngMethod {
+ Browser,
+ Node
+}
+
+#[derive(Clone, Debug)]
+pub struct OsRng(OsRngMethod);
+
+impl OsRngImpl for OsRng {
+ fn new() -> Result<OsRng, Error> {
+ let result = js! {
+ try {
+ if (
+ typeof self === "object" &&
+ typeof self.crypto === "object" &&
+ typeof self.crypto.getRandomValues === "function"
+ ) {
+ return { success: true, ty: 1 };
+ }
+
+ if (typeof require("crypto").randomBytes === "function") {
+ return { success: true, ty: 2 };
+ }
+
+ return { success: false, error: new Error("not supported") };
+ } catch(err) {
+ return { success: false, error: err };
+ }
+ };
+
+ if js!{ return @{ result.as_ref() }.success } == true {
+ let ty = js!{ return @{ result }.ty };
+
+ if ty == 1 { Ok(OsRng(OsRngMethod::Browser)) }
+ else if ty == 2 { Ok(OsRng(OsRngMethod::Node)) }
+ else { unreachable!() }
+ } else {
+ let err: WebError = js!{ return @{ result }.error }.try_into().unwrap();
+ Err(Error::with_cause(ErrorKind::Unavailable, "WASM Error", err))
+ }
+ }
+
+
+ fn fill_chunk(&mut self, dest: &mut [u8]) -> Result<(), Error> {
+ assert_eq!(mem::size_of::<usize>(), 4);
+
+ let len = dest.len() as u32;
+ let ptr = dest.as_mut_ptr() as i32;
+
+ let result = match self.0 {
+ OsRngMethod::Browser => js! {
+ try {
+ let array = new Uint8Array(@{ len });
+ self.crypto.getRandomValues(array);
+ HEAPU8.set(array, @{ ptr });
+
+ return { success: true };
+ } catch(err) {
+ return { success: false, error: err };
+ }
+ },
+ OsRngMethod::Node => js! {
+ try {
+ let bytes = require("crypto").randomBytes(@{ len });
+ HEAPU8.set(new Uint8Array(bytes), @{ ptr });
+
+ return { success: true };
+ } catch(err) {
+ return { success: false, error: err };
+ }
+ }
+ };
+
+ if js!{ return @{ result.as_ref() }.success } == true {
+ Ok(())
+ } else {
+ let err: WebError = js!{ return @{ result }.error }.try_into().unwrap();
+ Err(Error::with_cause(ErrorKind::Unexpected, "WASM Error", err))
+ }
+ }
+
+ fn max_chunk_size(&self) -> usize { 65536 }
+
+ fn method_str(&self) -> &'static str {
+ match self.0 {
+ OsRngMethod::Browser => "Crypto.getRandomValues",
+ OsRngMethod::Node => "crypto.randomBytes",
+ }
+ }
+}
diff --git a/rand/rand_os/src/windows.rs b/rand/rand_os/src/windows.rs
new file mode 100644
index 0000000..6b06c7a
--- /dev/null
+++ b/rand/rand_os/src/windows.rs
@@ -0,0 +1,44 @@
+// Copyright 2018 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Implementation for Windows
+
+extern crate winapi;
+
+use rand_core::{Error, ErrorKind};
+use super::OsRngImpl;
+
+use std::io;
+
+use self::winapi::shared::minwindef::ULONG;
+use self::winapi::um::ntsecapi::RtlGenRandom;
+use self::winapi::um::winnt::PVOID;
+
+#[derive(Clone, Debug)]
+pub struct OsRng;
+
+impl OsRngImpl for OsRng {
+ fn new() -> Result<OsRng, Error> { Ok(OsRng) }
+
+ fn fill_chunk(&mut self, dest: &mut [u8]) -> Result<(), Error> {
+ let ret = unsafe {
+ RtlGenRandom(dest.as_mut_ptr() as PVOID, dest.len() as ULONG)
+ };
+ if ret == 0 {
+ return Err(Error::with_cause(
+ ErrorKind::Unavailable,
+ "couldn't generate random bytes",
+ io::Error::last_os_error()));
+ }
+ Ok(())
+ }
+
+ fn max_chunk_size(&self) -> usize { <ULONG>::max_value() as usize }
+
+ fn method_str(&self) -> &'static str { "RtlGenRandom" }
+}
generated by cgit v1.2.3 (git 2.46.0) at 2024-11-23 17:19:43 +0000