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-rw-r--r--rand/src/rngs/entropy.rs54
-rw-r--r--rand/src/rngs/mod.rs39
-rw-r--r--rand/src/rngs/os.rs1275
-rw-r--r--rand/src/rngs/small.rs4
-rw-r--r--rand/src/rngs/thread.rs16
5 files changed, 18 insertions, 1370 deletions
diff --git a/rand/src/rngs/entropy.rs b/rand/src/rngs/entropy.rs
index 8736324..372b4d7 100644
--- a/rand/src/rngs/entropy.rs
+++ b/rand/src/rngs/entropy.rs
@@ -191,43 +191,11 @@ impl EntropySource for NoSource {
}
-#[cfg(all(feature="std",
- any(target_os = "linux", target_os = "android",
- target_os = "netbsd",
- target_os = "dragonfly",
- target_os = "haiku",
- target_os = "emscripten",
- target_os = "solaris",
- target_os = "cloudabi",
- target_os = "macos", target_os = "ios",
- target_os = "freebsd",
- target_os = "openbsd", target_os = "bitrig",
- target_os = "redox",
- target_os = "fuchsia",
- windows,
- all(target_arch = "wasm32", feature = "stdweb"),
- all(target_arch = "wasm32", feature = "wasm-bindgen"),
-)))]
+#[cfg(feature="rand_os")]
#[derive(Clone, Debug)]
pub struct Os(rngs::OsRng);
-#[cfg(all(feature="std",
- any(target_os = "linux", target_os = "android",
- target_os = "netbsd",
- target_os = "dragonfly",
- target_os = "haiku",
- target_os = "emscripten",
- target_os = "solaris",
- target_os = "cloudabi",
- target_os = "macos", target_os = "ios",
- target_os = "freebsd",
- target_os = "openbsd", target_os = "bitrig",
- target_os = "redox",
- target_os = "fuchsia",
- windows,
- all(target_arch = "wasm32", feature = "stdweb"),
- all(target_arch = "wasm32", feature = "wasm-bindgen"),
-)))]
+#[cfg(feature="rand_os")]
impl EntropySource for Os {
fn new_and_fill(dest: &mut [u8]) -> Result<Self, Error> {
let mut rng = rngs::OsRng::new()?;
@@ -240,23 +208,7 @@ impl EntropySource for Os {
}
}
-#[cfg(not(all(feature="std",
- any(target_os = "linux", target_os = "android",
- target_os = "netbsd",
- target_os = "dragonfly",
- target_os = "haiku",
- target_os = "emscripten",
- target_os = "solaris",
- target_os = "cloudabi",
- target_os = "macos", target_os = "ios",
- target_os = "freebsd",
- target_os = "openbsd", target_os = "bitrig",
- target_os = "redox",
- target_os = "fuchsia",
- windows,
- all(target_arch = "wasm32", feature = "stdweb"),
- all(target_arch = "wasm32", feature = "wasm-bindgen"),
-))))]
+#[cfg(not(feature="std"))]
type Os = NoSource;
diff --git a/rand/src/rngs/mod.rs b/rand/src/rngs/mod.rs
index 70c4506..847fc94 100644
--- a/rand/src/rngs/mod.rs
+++ b/rand/src/rngs/mod.rs
@@ -178,40 +178,5 @@ pub use self::small::SmallRng;
pub use self::std::StdRng;
#[cfg(feature="std")] pub use self::thread::ThreadRng;
-#[cfg(all(feature="std",
- any(target_os = "linux", target_os = "android",
- target_os = "netbsd",
- target_os = "dragonfly",
- target_os = "haiku",
- target_os = "emscripten",
- target_os = "solaris",
- target_os = "cloudabi",
- target_os = "macos", target_os = "ios",
- target_os = "freebsd",
- target_os = "openbsd", target_os = "bitrig",
- target_os = "redox",
- target_os = "fuchsia",
- windows,
- all(target_arch = "wasm32", feature = "stdweb"),
- all(target_arch = "wasm32", feature = "wasm-bindgen"),
-)))]
-mod os;
-
-#[cfg(all(feature="std",
- any(target_os = "linux", target_os = "android",
- target_os = "netbsd",
- target_os = "dragonfly",
- target_os = "haiku",
- target_os = "emscripten",
- target_os = "solaris",
- target_os = "cloudabi",
- target_os = "macos", target_os = "ios",
- target_os = "freebsd",
- target_os = "openbsd", target_os = "bitrig",
- target_os = "redox",
- target_os = "fuchsia",
- windows,
- all(target_arch = "wasm32", feature = "stdweb"),
- all(target_arch = "wasm32", feature = "wasm-bindgen"),
-)))]
-pub use self::os::OsRng;
+#[cfg(feature="rand_os")]
+pub use rand_os::OsRng;
diff --git a/rand/src/rngs/os.rs b/rand/src/rngs/os.rs
deleted file mode 100644
index e609c50..0000000
--- a/rand/src/rngs/os.rs
+++ /dev/null
@@ -1,1275 +0,0 @@
-// 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.
-
-use std::fmt;
-use rand_core::{CryptoRng, RngCore, Error, impls};
-
-/// A random number generator that retrieves randomness straight from the
-/// operating system.
-///
-/// This 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.
-///
-/// # 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` in combination with `cargo-web` or
-/// `wasm-bindgen` depending on what features are activated for this crate.
-///
-/// ## 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
-///
-/// `OsRng` is extremely unlikely to fail if `OsRng::new()`, and one read from
-/// it, where succesfull. But in case it does fail, only [`try_fill_bytes`] is
-/// able to report the cause. Depending on the error the other [`RngCore`]
-/// methods will retry several times, and panic in case the error remains.
-///
-/// [`EntropyRng`]: struct.EntropyRng.html
-/// [`RngCore`]: ../trait.RngCore.html
-/// [`try_fill_bytes`]: ../trait.RngCore.html#method.tymethod.try_fill_bytes
-/// [`ErrorKind::NotReady`]: ../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
-
-
-#[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 { ::core::usize::MAX }
-
- // Name of the OS interface (used for logging).
- fn method_str(&self) -> &'static str;
-}
-
-
-
-
-// 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.
-#[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 {
- use {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)
- }
- }
-}
-
-
-#[cfg(any(target_os = "linux", target_os = "android"))]
-mod imp {
- extern crate libc;
-
- use {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)
- }
-}
-
-
-#[cfg(target_os = "netbsd")]
-mod imp {
- use 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" }
- }
-}
-
-
-#[cfg(any(target_os = "dragonfly",
- target_os = "haiku",
- target_os = "emscripten"))]
-mod imp {
- use 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" }
- }
-}
-
-
-// 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.
-#[cfg(target_os = "solaris")]
-mod imp {
- extern crate libc;
-
- use {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};
-
- #[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 = ::core::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)
- }
-}
-
-
-#[cfg(target_os = "cloudabi")]
-mod imp {
- extern crate cloudabi;
-
- use std::io;
- use {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" }
- }
-}
-
-
-#[cfg(any(target_os = "macos", target_os = "ios"))]
-mod imp {
- extern crate libc;
-
- use {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" }
- }
-}
-
-
-#[cfg(target_os = "freebsd")]
-mod imp {
- extern crate libc;
-
- use {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" }
- }
-}
-
-
-#[cfg(any(target_os = "openbsd", target_os = "bitrig"))]
-mod imp {
- extern crate libc;
-
- use {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" }
- }
-}
-
-
-#[cfg(target_os = "redox")]
-mod imp {
- use 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:'" }
- }
-}
-
-
-#[cfg(target_os = "fuchsia")]
-mod imp {
- extern crate fuchsia_zircon;
-
- use {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" }
- }
-}
-
-
-#[cfg(windows)]
-mod imp {
- extern crate winapi;
-
- use {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" }
- }
-}
-
-
-#[cfg(all(target_arch = "wasm32",
- not(target_os = "emscripten"),
- feature = "stdweb"))]
-mod imp {
- use std::mem;
- use stdweb::unstable::TryInto;
- use stdweb::web::error::Error as WebError;
- use {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",
- }
- }
- }
-}
-
-#[cfg(all(target_arch = "wasm32",
- not(target_os = "emscripten"),
- not(feature = "stdweb"),
- feature = "wasm-bindgen"))]
-mod imp {
- use __wbg_shims::*;
-
- use {Error, ErrorKind};
- use super::OsRngImpl;
-
- #[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",
- }
- }
- }
-}
-
-
-#[cfg(test)]
-mod test {
- use RngCore;
- use super::OsRng;
-
- #[test]
- fn test_os_rng() {
- let mut r = OsRng::new().unwrap();
-
- r.next_u32();
- r.next_u64();
-
- let mut v1 = [0u8; 1000];
- r.fill_bytes(&mut v1);
-
- let mut v2 = [0u8; 1000];
- r.fill_bytes(&mut v2);
-
- let mut n_diff_bits = 0;
- for i in 0..v1.len() {
- n_diff_bits += (v1[i] ^ v2[i]).count_ones();
- }
-
- // Check at least 1 bit per byte differs. p(failure) < 1e-1000 with random input.
- assert!(n_diff_bits >= v1.len() as u32);
- }
-
- #[test]
- fn test_os_rng_empty() {
- let mut r = OsRng::new().unwrap();
-
- let mut empty = [0u8; 0];
- r.fill_bytes(&mut empty);
- }
-
- #[test]
- fn test_os_rng_huge() {
- let mut r = OsRng::new().unwrap();
-
- let mut huge = [0u8; 100_000];
- r.fill_bytes(&mut huge);
- }
-
- #[cfg(not(any(target_arch = "wasm32", target_arch = "asmjs")))]
- #[test]
- fn test_os_rng_tasks() {
- use std::sync::mpsc::channel;
- use std::thread;
-
- let mut txs = vec!();
- for _ in 0..20 {
- let (tx, rx) = channel();
- txs.push(tx);
-
- thread::spawn(move|| {
- // wait until all the tasks are ready to go.
- rx.recv().unwrap();
-
- // deschedule to attempt to interleave things as much
- // as possible (XXX: is this a good test?)
- let mut r = OsRng::new().unwrap();
- thread::yield_now();
- let mut v = [0u8; 1000];
-
- for _ in 0..100 {
- r.next_u32();
- thread::yield_now();
- r.next_u64();
- thread::yield_now();
- r.fill_bytes(&mut v);
- thread::yield_now();
- }
- });
- }
-
- // start all the tasks
- for tx in txs.iter() {
- tx.send(()).unwrap();
- }
- }
-}
diff --git a/rand/src/rngs/small.rs b/rand/src/rngs/small.rs
index e74a83e..b652c8c 100644
--- a/rand/src/rngs/small.rs
+++ b/rand/src/rngs/small.rs
@@ -10,9 +10,9 @@
use {RngCore, SeedableRng, Error};
-#[cfg(all(rust_1_26, target_pointer_width = "64"))]
+#[cfg(all(all(rustc_1_26, not(target_os = "emscripten")), target_pointer_width = "64"))]
type Rng = ::rand_pcg::Pcg64Mcg;
-#[cfg(not(all(rust_1_26, target_pointer_width = "64")))]
+#[cfg(not(all(all(rustc_1_26, not(target_os = "emscripten")), target_pointer_width = "64")))]
type Rng = ::rand_pcg::Pcg32;
/// An RNG recommended when small state, cheap initialization and good
diff --git a/rand/src/rngs/thread.rs b/rand/src/rngs/thread.rs
index ff772e3..7977d85 100644
--- a/rand/src/rngs/thread.rs
+++ b/rand/src/rngs/thread.rs
@@ -87,10 +87,11 @@ thread_local!(
}
);
-/// Retrieve the lazily-initialized thread-local random number
-/// generator, seeded by the system. Intended to be used in method
-/// chaining style, e.g. `thread_rng().gen::<i32>()`, or cached locally, e.g.
-/// `let mut rng = thread_rng();`.
+/// Retrieve the lazily-initialized thread-local random number generator,
+/// seeded by the system. Intended to be used in method chaining style,
+/// e.g. `thread_rng().gen::<i32>()`, or cached locally, e.g.
+/// `let mut rng = thread_rng();`. Invoked by the `Default` trait, making
+/// `ThreadRng::default()` equivelent.
///
/// For more information see [`ThreadRng`].
///
@@ -99,6 +100,12 @@ pub fn thread_rng() -> ThreadRng {
ThreadRng { rng: THREAD_RNG_KEY.with(|t| t.get()) }
}
+impl Default for ThreadRng {
+ fn default() -> ThreadRng {
+ ::prelude::thread_rng()
+ }
+}
+
impl RngCore for ThreadRng {
#[inline(always)]
fn next_u32(&mut self) -> u32 {
@@ -125,7 +132,6 @@ impl CryptoRng for ThreadRng {}
#[cfg(test)]
mod test {
#[test]
- #[cfg(not(feature="stdweb"))]
fn test_thread_rng() {
use Rng;
let mut r = ::thread_rng();
generated by cgit v1.2.3 (git 2.46.0) at 2024-11-23 10:43:47 +0000