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{"files":{"CHANGELOG.md":"35b32c8dc19610e66f7c6967e93f5a0f49e5a021c633da72e7219571cfb7b457","COPYRIGHT":"90eb64f0279b0d9432accfa6023ff803bc4965212383697eee27a0f426d5f8d5","Cargo.toml":"38f22c1be27541f74b322a721c95aaacd622cddfa02cfa22f7976d613453dc78","LICENSE-APACHE":"aaff376532ea30a0cd5330b9502ad4a4c8bf769c539c87ffe78819d188a18ebf","LICENSE-MIT":"209fbbe0ad52d9235e37badf9cadfe4dbdc87203179c0899e738b39ade42177b","README.md":"2781af9ae12e434bb3f43c5a3b16b330eea7a8c80065e28e967333a82be7a507","src/block.rs":"43778ab70f0b650c3203a6da70b40bc33afa845a5e14ef88dd26c18a07b70f88","src/error.rs":"8403a968d7c9bd95cc9f23d9dc5cc4771ede8e81dda5a8fdd59d347590345d14","src/impls.rs":"c248ddd04a65c974768baaec028fa0d2a6117525fa27bce8a98f2ba2f352700a","src/le.rs":"cb187f58f7514877918f7f47633397e08e20392dcf072bc245d62c9e5238198c","src/lib.rs":"4452ea591ce26f69e6a3dd1341795faeec5c14af35eb4a17aaf2b5d342753cf0"},"package":"7a6fdeb83b075e8266dcc8762c22776f6877a63111121f5f8c7411e5be7eed4b"}

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# Changelog
All notable changes to this project will be documented in this file.
The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
## [0.3.1] - 2019-01-25
- Compatibility shim around version 0.4
## [0.3.0] - 2018-09-24
- Add `SeedableRng::seed_from_u64` for convenient seeding. (#537)
## [0.2.1] - 2018-06-08
- References to a `CryptoRng` now also implement `CryptoRng`. (#470)
## [0.2.0] - 2018-05-21
- Enable the `std` feature by default. (#409)
- Remove `BlockRng{64}::inner` and `BlockRng::inner_mut`; instead making `core` public
- Add `BlockRng{64}::index` and `BlockRng{64}::generate_and_set`. (#374, #419)
- Change `BlockRngCore::Results` bound to also require `AsMut<[Self::Item]>`. (#419)
- Implement `std::io::Read` for RngCore. (#434)
## [0.1.0] - 2018-04-17
(Split out of the Rand crate, changes here are relative to rand 0.4.2)
- `RngCore` and `SeedableRng` are now part of `rand_core`. (#288)
- Add modules to help implementing RNGs `impl` and `le`. (#209, #228)
- Add `Error` and `ErrorKind`. (#225)
- Add `CryptoRng` marker trait. (#273)
- Add `BlockRngCore` trait. (#281)
- Add `BlockRng` and `BlockRng64` wrappers to help implementations. (#281, #325)
- Revise the `SeedableRng` trait. (#233)
- Remove default implementations for `RngCore::next_u64` and `RngCore::fill_bytes`. (#288)
- Add `RngCore::try_fill_bytes`. (#225)
## [0.0.1] - 2017-09-14 (yanked)
Experimental version as part of the rand crate refactor.

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Copyrights in the Rand project are retained by their contributors. No
copyright assignment is required to contribute to the Rand project.
For full authorship information, see the version control history.
Except as otherwise noted (below and/or in individual files), Rand is
licensed under the Apache License, Version 2.0 <LICENSE-APACHE> or
<http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
<LICENSE-MIT> or <http://opensource.org/licenses/MIT>, at your option.
The Rand project includes code from the Rust project
published under these same licenses.

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# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
#
# When uploading crates to the registry Cargo will automatically
# "normalize" Cargo.toml files for maximal compatibility
# with all versions of Cargo and also rewrite `path` dependencies
# to registry (e.g. crates.io) dependencies
#
# If you believe there's an error in this file please file an
# issue against the rust-lang/cargo repository. If you're
# editing this file be aware that the upstream Cargo.toml
# will likely look very different (and much more reasonable)
[package]
name = "rand_core"
version = "0.3.1"
authors = ["The Rand Project Developers", "The Rust Project Developers"]
description = "Core random number generator traits and tools for implementation.\n"
homepage = "https://crates.io/crates/rand_core"
documentation = "https://rust-random.github.io/rand/rand_core"
readme = "README.md"
keywords = ["random", "rng"]
categories = ["algorithms", "no-std"]
license = "MIT/Apache-2.0"
repository = "https://github.com/rust-random/rand"
[dependencies.rand_core]
version = "0.4"
[features]
alloc = ["rand_core/alloc"]
default = ["std"]
serde1 = ["rand_core/serde1"]
std = ["rand_core/std"]
[badges.appveyor]
repository = "rust-random/rand"
[badges.travis-ci]
repository = "rust-random/rand"

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Copyright 2018 Developers of the Rand project
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# rand_core
[![Build Status](https://travis-ci.org/rust-random/rand.svg)](https://travis-ci.org/rust-random/rand)
[![Build Status](https://ci.appveyor.com/api/projects/status/github/rust-random/rand?svg=true)](https://ci.appveyor.com/project/rust-random/rand)
[![Latest version](https://img.shields.io/crates/v/rand_core.svg)](https://crates.io/crates/rand_core)
[![Book](https://img.shields.io/badge/book-master-yellow.svg)](https://rust-random.github.io/book/)
[![API](https://img.shields.io/badge/api-master-yellow.svg)](https://rust-random.github.io/rand/rand_core)
[![API](https://docs.rs/rand_core/badge.svg)](https://docs.rs/rand_core)
[![Minimum rustc version](https://img.shields.io/badge/rustc-1.22+-lightgray.svg)](https://github.com/rust-random/rand#rust-version-requirements)
Core traits and error types of the [rand] library, plus tools for implementing
RNGs.
This crate is intended for use when implementing the core trait, `RngCore`; it
defines the core traits to be implemented as well as several small functions to
aid in their implementation and types required for error handling.
The main [rand] crate re-exports most items defined in this crate, along with
tools to convert the integer samples generated by `RngCore` to many different
applications (including sampling from restricted ranges, conversion to floating
point, list permutations and secure initialisation of RNGs). Most users should
prefer to use the main [rand] crate.
Links:
- [API documentation (master)](https://rust-random.github.io/rand/rand_core)
- [API documentation (docs.rs)](https://docs.rs/rand_core)
- [Changelog](CHANGELOG.md)
[rand]: https://crates.io/crates/rand
## Functionality
The `rand_core` crate provides:
- base random number generator traits
- error-reporting types
- functionality to aid implementation of RNGs
The traits and error types are also available via `rand`.
## Crate Features
`rand_core` supports `no_std` and `alloc`-only configurations, as well as full
`std` functionality. The differences between `no_std` and full `std` are small,
comprising `RngCore` support for `Box<R>` types where `R: RngCore`, as well as
extensions to the `Error` type's functionality.
Due to [rust-lang/cargo#1596](https://github.com/rust-lang/cargo/issues/1596),
`rand_core` is built without `std` support by default. Since features are
unioned across the whole dependency tree, any crate using `rand` with its
default features will also enable `std` support in `rand_core`.
The `serde1` feature can be used to derive `Serialize` and `Deserialize` for RNG
implementations that use the `BlockRng` or `BlockRng64` wrappers.
# License
`rand_core` is distributed under the terms of both the MIT license and the
Apache License (Version 2.0).
See [LICENSE-APACHE](LICENSE-APACHE) and [LICENSE-MIT](LICENSE-MIT), and
[COPYRIGHT](COPYRIGHT) for details.

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// 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.
//! The `BlockRngCore` trait and implementation helpers
//!
//! The [`BlockRngCore`] trait exists to assist in the implementation of RNGs
//! which generate a block of data in a cache instead of returning generated
//! values directly.
//!
//! Usage of this trait is optional, but provides two advantages:
//! implementations only need to concern themselves with generation of the
//! block, not the various [`RngCore`] methods (especially [`fill_bytes`], where
//! the optimal implementations are not trivial), and this allows
//! `ReseedingRng` (see [`rand`](https://docs.rs/rand) crate) perform periodic
//! reseeding with very low overhead.
//!
//! # Example
//!
//! ```norun
//! use rand_core::block::{BlockRngCore, BlockRng};
//!
//! struct MyRngCore;
//!
//! impl BlockRngCore for MyRngCore {
//! type Results = [u32; 16];
//!
//! fn generate(&mut self, results: &mut Self::Results) {
//! unimplemented!()
//! }
//! }
//!
//! impl SeedableRng for MyRngCore {
//! type Seed = unimplemented!();
//! fn from_seed(seed: Self::Seed) -> Self {
//! unimplemented!()
//! }
//! }
//!
//! // optionally, also implement CryptoRng for MyRngCore
//!
//! // Final RNG.
//! type MyRng = BlockRng<u32, MyRngCore>;
//! ```
//!
//! [`BlockRngCore`]: crate::block::BlockRngCore
//! [`fill_bytes`]: RngCore::fill_bytes
use core::convert::AsRef;
use core::fmt;
use {RngCore, CryptoRng, SeedableRng, Error};
use impls::{fill_via_u32_chunks, fill_via_u64_chunks};
/// A trait for RNGs which do not generate random numbers individually, but in
/// blocks (typically `[u32; N]`). This technique is commonly used by
/// cryptographic RNGs to improve performance.
///
/// See the [module][crate::block] documentation for details.
pub trait BlockRngCore {
/// Results element type, e.g. `u32`.
type Item;
/// Results type. This is the 'block' an RNG implementing `BlockRngCore`
/// generates, which will usually be an array like `[u32; 16]`.
type Results: AsRef<[Self::Item]> + AsMut<[Self::Item]> + Default;
/// Generate a new block of results.
fn generate(&mut self, results: &mut Self::Results);
}
/// A wrapper type implementing [`RngCore`] for some type implementing
/// [`BlockRngCore`] with `u32` array buffer; i.e. this can be used to implement
/// a full RNG from just a `generate` function.
///
/// The `core` field may be accessed directly but the results buffer may not.
/// PRNG implementations can simply use a type alias
/// (`pub type MyRng = BlockRng<MyRngCore>;`) but might prefer to use a
/// wrapper type (`pub struct MyRng(BlockRng<MyRngCore>);`); the latter must
/// re-implement `RngCore` but hides the implementation details and allows
/// extra functionality to be defined on the RNG
/// (e.g. `impl MyRng { fn set_stream(...){...} }`).
///
/// `BlockRng` has heavily optimized implementations of the [`RngCore`] methods
/// reading values from the results buffer, as well as
/// calling [`BlockRngCore::generate`] directly on the output array when
/// [`fill_bytes`] / [`try_fill_bytes`] is called on a large array. These methods
/// also handle the bookkeeping of when to generate a new batch of values.
///
/// No whole generated `u32` values are thown away and all values are consumed
/// in-order. [`next_u32`] simply takes the next available `u32` value.
/// [`next_u64`] is implemented by combining two `u32` values, least
/// significant first. [`fill_bytes`] and [`try_fill_bytes`] consume a whole
/// number of `u32` values, converting each `u32` to a byte slice in
/// little-endian order. If the requested byte length is not a multiple of 4,
/// some bytes will be discarded.
///
/// See also [`BlockRng64`] which uses `u64` array buffers. Currently there is
/// no direct support for other buffer types.
///
/// For easy initialization `BlockRng` also implements [`SeedableRng`].
///
/// [`next_u32`]: RngCore::next_u32
/// [`next_u64`]: RngCore::next_u64
/// [`fill_bytes`]: RngCore::fill_bytes
/// [`try_fill_bytes`]: RngCore::try_fill_bytes
#[derive(Clone)]
#[cfg_attr(feature="serde1", derive(Serialize, Deserialize))]
pub struct BlockRng<R: BlockRngCore + ?Sized> {
results: R::Results,
index: usize,
/// The *core* part of the RNG, implementing the `generate` function.
pub core: R,
}
// Custom Debug implementation that does not expose the contents of `results`.
impl<R: BlockRngCore + fmt::Debug> fmt::Debug for BlockRng<R> {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
fmt.debug_struct("BlockRng")
.field("core", &self.core)
.field("result_len", &self.results.as_ref().len())
.field("index", &self.index)
.finish()
}
}
impl<R: BlockRngCore> BlockRng<R> {
/// Create a new `BlockRng` from an existing RNG implementing
/// `BlockRngCore`. Results will be generated on first use.
pub fn new(core: R) -> BlockRng<R>{
let results_empty = R::Results::default();
BlockRng {
core,
index: results_empty.as_ref().len(),
results: results_empty,
}
}
/// Get the index into the result buffer.
///
/// If this is equal to or larger than the size of the result buffer then
/// the buffer is "empty" and `generate()` must be called to produce new
/// results.
pub fn index(&self) -> usize {
self.index
}
/// Reset the number of available results.
/// This will force a new set of results to be generated on next use.
pub fn reset(&mut self) {
self.index = self.results.as_ref().len();
}
/// Generate a new set of results immediately, setting the index to the
/// given value.
pub fn generate_and_set(&mut self, index: usize) {
assert!(index < self.results.as_ref().len());
self.core.generate(&mut self.results);
self.index = index;
}
}
impl<R: BlockRngCore<Item=u32>> RngCore for BlockRng<R>
where <R as BlockRngCore>::Results: AsRef<[u32]> + AsMut<[u32]>
{
#[inline(always)]
fn next_u32(&mut self) -> u32 {
if self.index >= self.results.as_ref().len() {
self.generate_and_set(0);
}
let value = self.results.as_ref()[self.index];
self.index += 1;
value
}
#[inline(always)]
fn next_u64(&mut self) -> u64 {
let read_u64 = |results: &[u32], index| {
if cfg!(any(target_arch = "x86", target_arch = "x86_64")) {
// requires little-endian CPU supporting unaligned reads:
unsafe { *(&results[index] as *const u32 as *const u64) }
} else {
let x = u64::from(results[index]);
let y = u64::from(results[index + 1]);
(y << 32) | x
}
};
let len = self.results.as_ref().len();
let index = self.index;
if index < len-1 {
self.index += 2;
// Read an u64 from the current index
read_u64(self.results.as_ref(), index)
} else if index >= len {
self.generate_and_set(2);
read_u64(self.results.as_ref(), 0)
} else {
let x = u64::from(self.results.as_ref()[len-1]);
self.generate_and_set(1);
let y = u64::from(self.results.as_ref()[0]);
(y << 32) | x
}
}
// As an optimization we try to write directly into the output buffer.
// This is only enabled for little-endian platforms where unaligned writes
// are known to be safe and fast.
#[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
fn fill_bytes(&mut self, dest: &mut [u8]) {
let mut filled = 0;
// Continue filling from the current set of results
if self.index < self.results.as_ref().len() {
let (consumed_u32, filled_u8) =
fill_via_u32_chunks(&self.results.as_ref()[self.index..],
dest);
self.index += consumed_u32;
filled += filled_u8;
}
let len_remainder =
(dest.len() - filled) % (self.results.as_ref().len() * 4);
let end_direct = dest.len() - len_remainder;
while filled < end_direct {
let dest_u32: &mut R::Results = unsafe {
&mut *(dest[filled..].as_mut_ptr() as
*mut <R as BlockRngCore>::Results)
};
self.core.generate(dest_u32);
filled += self.results.as_ref().len() * 4;
self.index = self.results.as_ref().len();
}
if len_remainder > 0 {
self.core.generate(&mut self.results);
let (consumed_u32, _) =
fill_via_u32_chunks(self.results.as_ref(),
&mut dest[filled..]);
self.index = consumed_u32;
}
}
#[cfg(not(any(target_arch = "x86", target_arch = "x86_64")))]
fn fill_bytes(&mut self, dest: &mut [u8]) {
let mut read_len = 0;
while read_len < dest.len() {
if self.index >= self.results.as_ref().len() {
self.generate_and_set(0);
}
let (consumed_u32, filled_u8) =
fill_via_u32_chunks(&self.results.as_ref()[self.index..],
&mut dest[read_len..]);
self.index += consumed_u32;
read_len += filled_u8;
}
}
fn try_fill_bytes(&mut self, dest: &mut [u8]) -> Result<(), Error> {
self.fill_bytes(dest);
Ok(())
}
}
impl<R: BlockRngCore + SeedableRng> SeedableRng for BlockRng<R> {
type Seed = R::Seed;
fn from_seed(seed: Self::Seed) -> Self {
Self::new(R::from_seed(seed))
}
fn seed_from_u64(seed: u64) -> Self {
Self::new(R::seed_from_u64(seed))
}
fn from_rng<S: RngCore>(rng: S) -> Result<Self, Error> {
Ok(Self::new(R::from_rng(rng)?))
}
}
/// A wrapper type implementing [`RngCore`] for some type implementing
/// [`BlockRngCore`] with `u64` array buffer; i.e. this can be used to implement
/// a full RNG from just a `generate` function.
///
/// This is similar to [`BlockRng`], but specialized for algorithms that operate
/// on `u64` values.
///
/// No whole generated `u64` values are thrown away and all values are consumed
/// in-order. [`next_u64`] simply takes the next available `u64` value.
/// [`next_u32`] is however a bit special: half of a `u64` is consumed, leaving
/// the other half in the buffer. If the next function called is [`next_u32`]
/// then the other half is then consumed, however both [`next_u64`] and
/// [`fill_bytes`] discard the rest of any half-consumed `u64`s when called.
///
/// [`fill_bytes`] and [`try_fill_bytes`] consume a whole number of `u64`
/// values. If the requested length is not a multiple of 8, some bytes will be
/// discarded.
///
/// [`next_u32`]: RngCore::next_u32
/// [`next_u64`]: RngCore::next_u64
/// [`fill_bytes`]: RngCore::fill_bytes
/// [`try_fill_bytes`]: RngCore::try_fill_bytes
#[derive(Clone)]
#[cfg_attr(feature="serde1", derive(Serialize, Deserialize))]
pub struct BlockRng64<R: BlockRngCore + ?Sized> {
results: R::Results,
index: usize,
half_used: bool, // true if only half of the previous result is used
/// The *core* part of the RNG, implementing the `generate` function.
pub core: R,
}
// Custom Debug implementation that does not expose the contents of `results`.
impl<R: BlockRngCore + fmt::Debug> fmt::Debug for BlockRng64<R> {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
fmt.debug_struct("BlockRng64")
.field("core", &self.core)
.field("result_len", &self.results.as_ref().len())
.field("index", &self.index)
.field("half_used", &self.half_used)
.finish()
}
}
impl<R: BlockRngCore> BlockRng64<R> {
/// Create a new `BlockRng` from an existing RNG implementing
/// `BlockRngCore`. Results will be generated on first use.
pub fn new(core: R) -> BlockRng64<R>{
let results_empty = R::Results::default();
BlockRng64 {
core,
index: results_empty.as_ref().len(),
half_used: false,
results: results_empty,
}
}
/// Get the index into the result buffer.
///
/// If this is equal to or larger than the size of the result buffer then
/// the buffer is "empty" and `generate()` must be called to produce new
/// results.
pub fn index(&self) -> usize {
self.index
}
/// Reset the number of available results.
/// This will force a new set of results to be generated on next use.
pub fn reset(&mut self) {
self.index = self.results.as_ref().len();
self.half_used = false;
}
/// Generate a new set of results immediately, setting the index to the
/// given value.
pub fn generate_and_set(&mut self, index: usize) {
assert!(index < self.results.as_ref().len());
self.core.generate(&mut self.results);
self.index = index;
self.half_used = false;
}
}
impl<R: BlockRngCore<Item=u64>> RngCore for BlockRng64<R>
where <R as BlockRngCore>::Results: AsRef<[u64]> + AsMut<[u64]>
{
#[inline(always)]
fn next_u32(&mut self) -> u32 {
let mut index = self.index * 2 - self.half_used as usize;
if index >= self.results.as_ref().len() * 2 {
self.core.generate(&mut self.results);
self.index = 0;
// `self.half_used` is by definition `false`
self.half_used = false;
index = 0;
}
self.half_used = !self.half_used;
self.index += self.half_used as usize;
// Index as if this is a u32 slice.
unsafe {
let results =
&*(self.results.as_ref() as *const [u64] as *const [u32]);
if cfg!(target_endian = "little") {
*results.get_unchecked(index)
} else {
*results.get_unchecked(index ^ 1)
}
}
}
#[inline(always)]
fn next_u64(&mut self) -> u64 {
if self.index >= self.results.as_ref().len() {
self.core.generate(&mut self.results);
self.index = 0;
}
let value = self.results.as_ref()[self.index];
self.index += 1;
self.half_used = false;
value
}
// As an optimization we try to write directly into the output buffer.
// This is only enabled for little-endian platforms where unaligned writes
// are known to be safe and fast.
#[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
fn fill_bytes(&mut self, dest: &mut [u8]) {
let mut filled = 0;
self.half_used = false;
// Continue filling from the current set of results
if self.index < self.results.as_ref().len() {
let (consumed_u64, filled_u8) =
fill_via_u64_chunks(&self.results.as_ref()[self.index..],
dest);
self.index += consumed_u64;
filled += filled_u8;
}
let len_remainder =
(dest.len() - filled) % (self.results.as_ref().len() * 8);
let end_direct = dest.len() - len_remainder;
while filled < end_direct {
let dest_u64: &mut R::Results = unsafe {
::core::mem::transmute(dest[filled..].as_mut_ptr())
};
self.core.generate(dest_u64);
filled += self.results.as_ref().len() * 8;
self.index = self.results.as_ref().len();
}
if len_remainder > 0 {
self.core.generate(&mut self.results);
let (consumed_u64, _) =
fill_via_u64_chunks(&mut self.results.as_ref(),
&mut dest[filled..]);
self.index = consumed_u64;
}
}
#[cfg(not(any(target_arch = "x86", target_arch = "x86_64")))]
fn fill_bytes(&mut self, dest: &mut [u8]) {
let mut read_len = 0;
self.half_used = false;
while read_len < dest.len() {
if self.index as usize >= self.results.as_ref().len() {
self.core.generate(&mut self.results);
self.index = 0;
}
let (consumed_u64, filled_u8) =
fill_via_u64_chunks(&self.results.as_ref()[self.index as usize..],
&mut dest[read_len..]);
self.index += consumed_u64;
read_len += filled_u8;
}
}
fn try_fill_bytes(&mut self, dest: &mut [u8]) -> Result<(), Error> {
Ok(self.fill_bytes(dest))
}
}
impl<R: BlockRngCore + SeedableRng> SeedableRng for BlockRng64<R> {
type Seed = R::Seed;
fn from_seed(seed: Self::Seed) -> Self {
Self::new(R::from_seed(seed))
}
fn seed_from_u64(seed: u64) -> Self {
Self::new(R::seed_from_u64(seed))
}
fn from_rng<S: RngCore>(rng: S) -> Result<Self, Error> {
Ok(Self::new(R::from_rng(rng)?))
}
}
impl<R: BlockRngCore + CryptoRng> CryptoRng for BlockRng<R> {}

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// 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.
//! Error types
use core::fmt;
#[cfg(feature="std")]
use std::error::Error as stdError;
#[cfg(feature="std")]
use std::io;
/// Error kind which can be matched over.
#[derive(PartialEq, Eq, Debug, Copy, Clone)]
pub enum ErrorKind {
/// Feature is not available; not recoverable.
///
/// This is the most permanent failure type and implies the error cannot be
/// resolved simply by retrying (e.g. the feature may not exist in this
/// build of the application or on the current platform).
Unavailable,
/// General failure; there may be a chance of recovery on retry.
///
/// This is the catch-all kind for errors from known and unknown sources
/// which do not have a more specific kind / handling method.
///
/// It is suggested to retry a couple of times or retry later when
/// handling; some error sources may be able to resolve themselves,
/// although this is not likely.
Unexpected,
/// A transient failure which likely can be resolved or worked around.
///
/// This error kind exists for a few specific cases where it is known that
/// the error likely can be resolved internally, but is reported anyway.
Transient,
/// Not ready yet: recommended to try again a little later.
///
/// This error kind implies the generator needs more time or needs some
/// other part of the application to do something else first before it is
/// ready for use; for example this may be used by external generators
/// which require time for initialization.
NotReady,
#[doc(hidden)]
__Nonexhaustive,
}
impl ErrorKind {
/// True if this kind of error may resolve itself on retry.
///
/// See also `should_wait()`.
pub fn should_retry(self) -> bool {
self != ErrorKind::Unavailable
}
/// True if we should retry but wait before retrying
///
/// This implies `should_retry()` is true.
pub fn should_wait(self) -> bool {
self == ErrorKind::NotReady
}
/// A description of this error kind
pub fn description(self) -> &'static str {
match self {
ErrorKind::Unavailable => "permanently unavailable",
ErrorKind::Unexpected => "unexpected failure",
ErrorKind::Transient => "transient failure",
ErrorKind::NotReady => "not ready yet",
ErrorKind::__Nonexhaustive => unreachable!(),
}
}
}
/// Error type of random number generators
///
/// This is a relatively simple error type, designed for compatibility with and
/// without the Rust `std` library. It embeds a "kind" code, a message (static
/// string only), and an optional chained cause (`std` only). The `kind` and
/// `msg` fields can be accessed directly; cause can be accessed via
/// `std::error::Error::cause` or `Error::take_cause`. Construction can only be
/// done via `Error::new` or `Error::with_cause`.
#[derive(Debug)]
pub struct Error {
/// The error kind
pub kind: ErrorKind,
/// The error message
pub msg: &'static str,
#[cfg(feature="std")]
cause: Option<Box<stdError + Send + Sync>>,
}
impl Error {
/// Create a new instance, with specified kind and a message.
pub fn new(kind: ErrorKind, msg: &'static str) -> Self {
#[cfg(feature="std")] {
Error { kind, msg, cause: None }
}
#[cfg(not(feature="std"))] {
Error { kind, msg }
}
}
/// Create a new instance, with specified kind, message, and a
/// chained cause.
///
/// Note: `stdError` is an alias for `std::error::Error`.
///
/// If not targetting `std` (i.e. `no_std`), this function is replaced by
/// another with the same prototype, except that there are no bounds on the
/// type `E` (because both `Box` and `stdError` are unavailable), and the
/// `cause` is ignored.
#[cfg(feature="std")]
pub fn with_cause<E>(kind: ErrorKind, msg: &'static str, cause: E) -> Self
where E: Into<Box<stdError + Send + Sync>>
{
Error { kind, msg, cause: Some(cause.into()) }
}
/// Create a new instance, with specified kind, message, and a
/// chained cause.
///
/// In `no_std` mode the *cause* is ignored.
#[cfg(not(feature="std"))]
pub fn with_cause<E>(kind: ErrorKind, msg: &'static str, _cause: E) -> Self {
Error { kind, msg }
}
/// Take the cause, if any. This allows the embedded cause to be extracted.
/// This uses `Option::take`, leaving `self` with no cause.
#[cfg(feature="std")]
pub fn take_cause(&mut self) -> Option<Box<stdError + Send + Sync>> {
self.cause.take()
}
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
#[cfg(feature="std")] {
if let Some(ref cause) = self.cause {
return write!(f, "{} ({}); cause: {}",
self.msg, self.kind.description(), cause);
}
}
write!(f, "{} ({})", self.msg, self.kind.description())
}
}
#[cfg(feature="std")]
impl stdError for Error {
fn description(&self) -> &str {
self.msg
}
fn cause(&self) -> Option<&stdError> {
self.cause.as_ref().map(|e| e.as_ref() as &stdError)
}
}
#[cfg(feature="std")]
impl From<Error> for io::Error {
fn from(error: Error) -> Self {
use std::io::ErrorKind::*;
match error.kind {
ErrorKind::Unavailable => io::Error::new(NotFound, error),
ErrorKind::Unexpected |
ErrorKind::Transient => io::Error::new(Other, error),
ErrorKind::NotReady => io::Error::new(WouldBlock, error),
ErrorKind::__Nonexhaustive => unreachable!(),
}
}
}

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// 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 for implementing `RngCore` functions.
//!
//! For cross-platform reproducibility, these functions all use Little Endian:
//! least-significant part first. For example, `next_u64_via_u32` takes `u32`
//! values `x, y`, then outputs `(y << 32) | x`. To implement `next_u32`
//! from `next_u64` in little-endian order, one should use `next_u64() as u32`.
//!
//! Byte-swapping (like the std `to_le` functions) is only needed to convert
//! to/from byte sequences, and since its purpose is reproducibility,
//! non-reproducible sources (e.g. `OsRng`) need not bother with it.
use core::intrinsics::transmute;
use core::ptr::copy_nonoverlapping;
use core::slice;
use core::cmp::min;
use core::mem::size_of;
use RngCore;
/// Implement `next_u64` via `next_u32`, little-endian order.
pub fn next_u64_via_u32<R: RngCore + ?Sized>(rng: &mut R) -> u64 {
// Use LE; we explicitly generate one value before the next.
let x = u64::from(rng.next_u32());
let y = u64::from(rng.next_u32());
(y << 32) | x
}
/// Implement `fill_bytes` via `next_u64` and `next_u32`, little-endian order.
///
/// The fastest way to fill a slice is usually to work as long as possible with
/// integers. That is why this method mostly uses `next_u64`, and only when
/// there are 4 or less bytes remaining at the end of the slice it uses
/// `next_u32` once.
pub fn fill_bytes_via_next<R: RngCore + ?Sized>(rng: &mut R, dest: &mut [u8]) {
let mut left = dest;
while left.len() >= 8 {
let (l, r) = {left}.split_at_mut(8);
left = r;
let chunk: [u8; 8] = unsafe {
transmute(rng.next_u64().to_le())
};
l.copy_from_slice(&chunk);
}
let n = left.len();
if n > 4 {
let chunk: [u8; 8] = unsafe {
transmute(rng.next_u64().to_le())
};
left.copy_from_slice(&chunk[..n]);
} else if n > 0 {
let chunk: [u8; 4] = unsafe {
transmute(rng.next_u32().to_le())
};
left.copy_from_slice(&chunk[..n]);
}
}
macro_rules! impl_uint_from_fill {
($rng:expr, $ty:ty, $N:expr) => ({
debug_assert!($N == size_of::<$ty>());
let mut int: $ty = 0;
unsafe {
let ptr = &mut int as *mut $ty as *mut u8;
let slice = slice::from_raw_parts_mut(ptr, $N);
$rng.fill_bytes(slice);
}
int
});
}
macro_rules! fill_via_chunks {
($src:expr, $dst:expr, $ty:ty, $size:expr) => ({
let chunk_size_u8 = min($src.len() * $size, $dst.len());
let chunk_size = (chunk_size_u8 + $size - 1) / $size;
if cfg!(target_endian="little") {
unsafe {
copy_nonoverlapping(
$src.as_ptr() as *const u8,
$dst.as_mut_ptr(),
chunk_size_u8);
}
} else {
for (&n, chunk) in $src.iter().zip($dst.chunks_mut($size)) {
let tmp = n.to_le();
let src_ptr = &tmp as *const $ty as *const u8;
unsafe {
copy_nonoverlapping(src_ptr,
chunk.as_mut_ptr(),
chunk.len());
}
}
}
(chunk_size, chunk_size_u8)
});
}
/// Implement `fill_bytes` by reading chunks from the output buffer of a block
/// based RNG.
///
/// The return values are `(consumed_u32, filled_u8)`.
///
/// `filled_u8` is the number of filled bytes in `dest`, which may be less than
/// the length of `dest`.
/// `consumed_u32` is the number of words consumed from `src`, which is the same
/// as `filled_u8 / 4` rounded up.
///
/// # Example
/// (from `IsaacRng`)
///
/// ```ignore
/// fn fill_bytes(&mut self, dest: &mut [u8]) {
/// let mut read_len = 0;
/// while read_len < dest.len() {
/// if self.index >= self.rsl.len() {
/// self.isaac();
/// }
///
/// let (consumed_u32, filled_u8) =
/// impls::fill_via_u32_chunks(&mut self.rsl[self.index..],
/// &mut dest[read_len..]);
///
/// self.index += consumed_u32;
/// read_len += filled_u8;
/// }
/// }
/// ```
pub fn fill_via_u32_chunks(src: &[u32], dest: &mut [u8]) -> (usize, usize) {
fill_via_chunks!(src, dest, u32, 4)
}
/// Implement `fill_bytes` by reading chunks from the output buffer of a block
/// based RNG.
///
/// The return values are `(consumed_u64, filled_u8)`.
/// `filled_u8` is the number of filled bytes in `dest`, which may be less than
/// the length of `dest`.
/// `consumed_u64` is the number of words consumed from `src`, which is the same
/// as `filled_u8 / 8` rounded up.
///
/// See `fill_via_u32_chunks` for an example.
pub fn fill_via_u64_chunks(src: &[u64], dest: &mut [u8]) -> (usize, usize) {
fill_via_chunks!(src, dest, u64, 8)
}
/// Implement `next_u32` via `fill_bytes`, little-endian order.
pub fn next_u32_via_fill<R: RngCore + ?Sized>(rng: &mut R) -> u32 {
impl_uint_from_fill!(rng, u32, 4)
}
/// Implement `next_u64` via `fill_bytes`, little-endian order.
pub fn next_u64_via_fill<R: RngCore + ?Sized>(rng: &mut R) -> u64 {
impl_uint_from_fill!(rng, u64, 8)
}
// TODO: implement tests for the above

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// 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.
//! Little-Endian utilities
//!
//! Little-Endian order has been chosen for internal usage; this makes some
//! useful functions available.
use core::ptr;
macro_rules! read_slice {
($src:expr, $dst:expr, $size:expr, $which:ident) => {{
assert_eq!($src.len(), $size * $dst.len());
unsafe {
ptr::copy_nonoverlapping(
$src.as_ptr(),
$dst.as_mut_ptr() as *mut u8,
$src.len());
}
for v in $dst.iter_mut() {
*v = v.$which();
}
}};
}
/// Reads unsigned 32 bit integers from `src` into `dst`.
/// Borrowed from the `byteorder` crate.
#[inline]
pub fn read_u32_into(src: &[u8], dst: &mut [u32]) {
read_slice!(src, dst, 4, to_le);
}
/// Reads unsigned 64 bit integers from `src` into `dst`.
/// Borrowed from the `byteorder` crate.
#[inline]
pub fn read_u64_into(src: &[u8], dst: &mut [u64]) {
read_slice!(src, dst, 8, to_le);
}
#[test]
fn test_read() {
let bytes = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16];
let mut buf = [0u32; 4];
read_u32_into(&bytes, &mut buf);
assert_eq!(buf[0], 0x04030201);
assert_eq!(buf[3], 0x100F0E0D);
let mut buf = [0u32; 3];
read_u32_into(&bytes[1..13], &mut buf); // unaligned
assert_eq!(buf[0], 0x05040302);
assert_eq!(buf[2], 0x0D0C0B0A);
let mut buf = [0u64; 2];
read_u64_into(&bytes, &mut buf);
assert_eq!(buf[0], 0x0807060504030201);
assert_eq!(buf[1], 0x100F0E0D0C0B0A09);
let mut buf = [0u64; 1];
read_u64_into(&bytes[7..15], &mut buf); // unaligned
assert_eq!(buf[0], 0x0F0E0D0C0B0A0908);
}

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// Copyright 2018 Developers of the Rand project.
// Copyright 2017-2018 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.
//! Random number generation traits
//!
//! This version of `rand_core` is a compatibility shim around version 0.3.
//!
//! This crate is mainly of interest to crates publishing implementations of
//! [`RngCore`]. Other users are encouraged to use the [`rand`] crate instead
//! which re-exports the main traits and error types.
//!
//! [`RngCore`] is the core trait implemented by algorithmic pseudo-random number
//! generators and external random-number sources.
//!
//! [`SeedableRng`] is an extension trait for construction from fixed seeds and
//! other random number generators.
//!
//! [`Error`] is provided for error-handling. It is safe to use in `no_std`
//! environments.
//!
//! The [`impls`] and [`le`] sub-modules include a few small functions to assist
//! implementation of [`RngCore`].
//!
//! [`rand`]: https://docs.rs/rand
#![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))))]
#![no_std]
extern crate rand_core as core4;
pub use core4::{ErrorKind, Error};
pub use core4::{block, impls, le};
pub use core4::{RngCore, CryptoRng, SeedableRng};