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-rw-r--r--rand/rand_core/CHANGELOG.md58
-rw-r--r--rand/rand_core/COPYRIGHT12
-rw-r--r--rand/rand_core/Cargo.toml28
-rw-r--r--rand/rand_core/LICENSE-APACHE201
-rw-r--r--rand/rand_core/LICENSE-MIT26
-rw-r--r--rand/rand_core/README.md82
-rw-r--r--rand/rand_core/src/block.rs437
-rw-r--r--rand/rand_core/src/error.rs190
-rw-r--r--rand/rand_core/src/impls.rs158
-rw-r--r--rand/rand_core/src/le.rs68
-rw-r--r--rand/rand_core/src/lib.rs492
-rw-r--r--rand/rand_core/src/os.rs85
12 files changed, 0 insertions, 1837 deletions
diff --git a/rand/rand_core/CHANGELOG.md b/rand/rand_core/CHANGELOG.md
deleted file mode 100644
index dfdd692..0000000
--- a/rand/rand_core/CHANGELOG.md
+++ /dev/null
@@ -1,58 +0,0 @@
-# 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).
-
-## [0.5.1] - 2019-08-28
-- `OsRng` added to `rand_core` (#863)
-- `Error::INTERNAL_START` and `Error::CUSTOM_START` constants (#864)
-- `Error::raw_os_error` method (#864)
-- `Debug` and `Display` formatting for `getrandom` error codes without `std` (#864)
-### Changed
-- `alloc` feature in `no_std` is available since Rust 1.36 (#856)
-- Added `#[inline]` to `Error` conversion methods (#864)
-
-## [0.5.0] - 2019-06-06
-### Changed
-- Enable testing with Miri and fix incorrect pointer usages (#779, #780, #781, #783, #784)
-- Rewrite `Error` type and adjust API (#800)
-- Adjust usage of `#[inline]` for `BlockRng` and `BlockRng64`
-
-## [0.4.0] - 2019-01-24
-### Changed
-- Disable the `std` feature by default (#702)
-
-## [0.3.0] - 2018-09-24
-### Added
-- Add `SeedableRng::seed_from_u64` for convenient seeding. (#537)
-
-## [0.2.1] - 2018-06-08
-### Added
-- References to a `CryptoRng` now also implement `CryptoRng`. (#470)
-
-## [0.2.0] - 2018-05-21
-### Changed
-- Enable the `std` feature by default. (#409)
-- Remove `BlockRng{64}::inner` and `BlockRng::inner_mut`; instead making `core` public
-- Change `BlockRngCore::Results` bound to also require `AsMut<[Self::Item]>`. (#419)
-### Added
-- Add `BlockRng{64}::index` and `BlockRng{64}::generate_and_set`. (#374, #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.)
-### Added
-- `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)
-- Add `RngCore::try_fill_bytes`. (#225)
-### Changed
-- Revise the `SeedableRng` trait. (#233)
-- Remove default implementations for `RngCore::next_u64` and `RngCore::fill_bytes`. (#288)
-
-## [0.0.1] - 2017-09-14 (yanked)
-Experimental version as part of the rand crate refactor.
diff --git a/rand/rand_core/COPYRIGHT b/rand/rand_core/COPYRIGHT
deleted file mode 100644
index 468d907..0000000
--- a/rand/rand_core/COPYRIGHT
+++ /dev/null
@@ -1,12 +0,0 @@
-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.
diff --git a/rand/rand_core/Cargo.toml b/rand/rand_core/Cargo.toml
deleted file mode 100644
index e52af5f..0000000
--- a/rand/rand_core/Cargo.toml
+++ /dev/null
@@ -1,28 +0,0 @@
-[package]
-name = "rand_core"
-version = "0.5.1"
-authors = ["The Rand Project Developers", "The Rust Project Developers"]
-license = "MIT OR Apache-2.0"
-readme = "README.md"
-repository = "https://github.com/rust-random/rand"
-documentation = "https://rust-random.github.io/rand/rand_core/"
-homepage = "https://crates.io/crates/rand_core"
-description = """
-Core random number generator traits and tools for implementation.
-"""
-keywords = ["random", "rng"]
-categories = ["algorithms", "no-std"]
-edition = "2018"
-
-[badges]
-travis-ci = { repository = "rust-random/rand" }
-appveyor = { repository = "rust-random/rand" }
-
-[features]
-std = ["alloc", "getrandom", "getrandom/std"] # use std library; should be default but for above bug
-alloc = [] # enables Vec and Box support without std
-serde1 = ["serde"] # enables serde for BlockRng wrapper
-
-[dependencies]
-serde = { version = "1", features = ["derive"], optional = true }
-getrandom = { version = "0.1", optional = true }
diff --git a/rand/rand_core/LICENSE-APACHE b/rand/rand_core/LICENSE-APACHE
deleted file mode 100644
index 17d7468..0000000
--- a/rand/rand_core/LICENSE-APACHE
+++ /dev/null
@@ -1,201 +0,0 @@
- Apache License
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- https://www.apache.org/licenses/
-
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diff --git a/rand/rand_core/LICENSE-MIT b/rand/rand_core/LICENSE-MIT
deleted file mode 100644
index d93b5ba..0000000
--- a/rand/rand_core/LICENSE-MIT
+++ /dev/null
@@ -1,26 +0,0 @@
-Copyright 2018 Developers of the Rand project
-Copyright (c) 2014 The Rust Project Developers
-
-Permission is hereby granted, free of charge, to any
-person obtaining a copy of this software and associated
-documentation files (the "Software"), to deal in the
-Software without restriction, including without
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-is furnished to do so, subject to the following
-conditions:
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-The above copyright notice and this permission notice
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-of the Software.
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-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
-ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
-TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
-PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
-SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
-CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
-OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
-IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
-DEALINGS IN THE SOFTWARE.
diff --git a/rand/rand_core/README.md b/rand/rand_core/README.md
deleted file mode 100644
index 467e66f..0000000
--- a/rand/rand_core/README.md
+++ /dev/null
@@ -1,82 +0,0 @@
-# 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-1.32+-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](https://github.com/rust-random/rand/blob/master/rand_core/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`.
-
-## Versions
-
-The current version is:
-```
-rand_core = "0.5.0"
-```
-
-Rand libs have inter-dependencies and make use of the
-[semver trick](https://github.com/dtolnay/semver-trick/) in order to make traits
-compatible across crate versions. (This is especially important for `RngCore`
-and `SeedableRng`.) A few crate releases are thus compatibility shims,
-depending on the *next* lib version (e.g. `rand_core` versions `0.2.2` and
-`0.3.1`). This means, for example, that `rand_core_0_4_0::SeedableRng` and
-`rand_core_0_3_0::SeedableRng` are distinct, incompatible traits, which can
-cause build errors. Usually, running `cargo update` is enough to fix any issues.
-
-## 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`,
-`std::io::Read` support for types supporting `RngCore`, and
-extensions to the `Error` type's functionality.
-
-The `std` feature is *not enabled by default*. This is primarily to avoid build
-problems where one crate implicitly requires `rand_core` with `std` support and
-another crate requires `rand` *without* `std` support. However, the `rand` crate
-continues to enable `std` support by default, both for itself and `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.
diff --git a/rand/rand_core/src/block.rs b/rand/rand_core/src/block.rs
deleted file mode 100644
index 0ab7458..0000000
--- a/rand/rand_core/src/block.rs
+++ /dev/null
@@ -1,437 +0,0 @@
-// 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, ptr};
-#[cfg(feature="serde1")] use serde::{Serialize, Deserialize};
-use crate::{RngCore, CryptoRng, SeedableRng, Error};
-use crate::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.
- #[inline]
- 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.
- #[inline(always)]
- 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.
- #[inline]
- 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.
- #[inline]
- 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]
- 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]
- fn next_u64(&mut self) -> u64 {
- let read_u64 = |results: &[u32], index| {
- if cfg!(any(target_endian = "little")) {
- // requires little-endian CPU
- #[allow(clippy::cast_ptr_alignment)] // false positive
- let ptr: *const u64 = results[index..=index+1].as_ptr() as *const u64;
- unsafe { ptr::read_unaligned(ptr) }
- } 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
- }
- }
-
- #[inline]
- 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;
- }
- }
-
- #[inline(always)]
- 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;
-
- #[inline(always)]
- fn from_seed(seed: Self::Seed) -> Self {
- Self::new(R::from_seed(seed))
- }
-
- #[inline(always)]
- fn seed_from_u64(seed: u64) -> Self {
- Self::new(R::seed_from_u64(seed))
- }
-
- #[inline(always)]
- 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.
- #[inline]
- 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.
- #[inline(always)]
- 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.
- #[inline]
- 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.
- #[inline]
- 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]
- 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]
- 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
- }
-
- #[inline]
- 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;
- }
- }
-
- #[inline(always)]
- fn try_fill_bytes(&mut self, dest: &mut [u8]) -> Result<(), Error> {
- self.fill_bytes(dest);
- Ok(())
- }
-}
-
-impl<R: BlockRngCore + SeedableRng> SeedableRng for BlockRng64<R> {
- type Seed = R::Seed;
-
- #[inline(always)]
- fn from_seed(seed: Self::Seed) -> Self {
- Self::new(R::from_seed(seed))
- }
-
- #[inline(always)]
- fn seed_from_u64(seed: u64) -> Self {
- Self::new(R::seed_from_u64(seed))
- }
-
- #[inline(always)]
- 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> {}
diff --git a/rand/rand_core/src/error.rs b/rand/rand_core/src/error.rs
deleted file mode 100644
index 30b095c..0000000
--- a/rand/rand_core/src/error.rs
+++ /dev/null
@@ -1,190 +0,0 @@
-// 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;
-use core::num::NonZeroU32;
-
-
-/// Error type of random number generators
-///
-/// In order to be compatible with `std` and `no_std`, this type has two
-/// possible implementations: with `std` a boxed `Error` trait object is stored,
-/// while with `no_std` we merely store an error code.
-pub struct Error {
- #[cfg(feature="std")]
- inner: Box<dyn std::error::Error + Send + Sync + 'static>,
- #[cfg(not(feature="std"))]
- code: NonZeroU32,
-}
-
-impl Error {
- /// Construct from any type supporting `std::error::Error`
- ///
- /// Available only when configured with `std`.
- ///
- /// See also `From<NonZeroU32>`, which is available with and without `std`.
- #[cfg(feature="std")]
- #[inline]
- pub fn new<E>(err: E) -> Self
- where E: Into<Box<dyn std::error::Error + Send + Sync + 'static>>
- {
- Error { inner: err.into() }
- }
-
- /// Reference the inner error (`std` only)
- ///
- /// When configured with `std`, this is a trivial operation and never
- /// panics. Without `std`, this method is simply unavailable.
- #[cfg(feature="std")]
- #[inline]
- pub fn inner(&self) -> &(dyn std::error::Error + Send + Sync + 'static) {
- &*self.inner
- }
-
- /// Unwrap the inner error (`std` only)
- ///
- /// When configured with `std`, this is a trivial operation and never
- /// panics. Without `std`, this method is simply unavailable.
- #[cfg(feature="std")]
- #[inline]
- pub fn take_inner(self) -> Box<dyn std::error::Error + Send + Sync + 'static> {
- self.inner
- }
-
- /// Codes below this point represent OS Errors (i.e. positive i32 values).
- /// Codes at or above this point, but below [`Error::CUSTOM_START`] are
- /// reserved for use by the `rand` and `getrandom` crates.
- pub const INTERNAL_START: u32 = 1 << 31;
-
- /// Codes at or above this point can be used by users to define their own
- /// custom errors.
- pub const CUSTOM_START: u32 = (1 << 31) + (1 << 30);
-
- /// Extract the raw OS error code (if this error came from the OS)
- ///
- /// This method is identical to `std::io::Error::raw_os_error()`, except
- /// that it works in `no_std` contexts. If this method returns `None`, the
- /// error value can still be formatted via the `Diplay` implementation.
- #[inline]
- pub fn raw_os_error(&self) -> Option<i32> {
- #[cfg(feature="std")] {
- if let Some(e) = self.inner.downcast_ref::<std::io::Error>() {
- return e.raw_os_error();
- }
- }
- match self.code() {
- Some(code) if u32::from(code) < Self::INTERNAL_START =>
- Some(u32::from(code) as i32),
- _ => None,
- }
- }
-
- /// Retrieve the error code, if any.
- ///
- /// If this `Error` was constructed via `From<NonZeroU32>`, then this method
- /// will return this `NonZeroU32` code (for `no_std` this is always the
- /// case). Otherwise, this method will return `None`.
- #[inline]
- pub fn code(&self) -> Option<NonZeroU32> {
- #[cfg(feature="std")] {
- self.inner.downcast_ref::<ErrorCode>().map(|c| c.0)
- }
- #[cfg(not(feature="std"))] {
- Some(self.code)
- }
- }
-}
-
-impl fmt::Debug for Error {
- fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
- #[cfg(feature="std")] {
- write!(f, "Error {{ inner: {:?} }}", self.inner)
- }
- #[cfg(all(feature="getrandom", not(feature="std")))] {
- getrandom::Error::from(self.code).fmt(f)
- }
- #[cfg(not(feature="getrandom"))] {
- write!(f, "Error {{ code: {} }}", self.code)
- }
- }
-}
-
-impl fmt::Display for Error {
- fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
- #[cfg(feature="std")] {
- write!(f, "{}", self.inner)
- }
- #[cfg(all(feature="getrandom", not(feature="std")))] {
- getrandom::Error::from(self.code).fmt(f)
- }
- #[cfg(not(feature="getrandom"))] {
- write!(f, "error code {}", self.code)
- }
- }
-}
-
-impl From<NonZeroU32> for Error {
- #[inline]
- fn from(code: NonZeroU32) -> Self {
- #[cfg(feature="std")] {
- Error { inner: Box::new(ErrorCode(code)) }
- }
- #[cfg(not(feature="std"))] {
- Error { code }
- }
- }
-}
-
-#[cfg(feature="getrandom")]
-impl From<getrandom::Error> for Error {
- #[inline]
- fn from(error: getrandom::Error) -> Self {
- #[cfg(feature="std")] {
- Error { inner: Box::new(error) }
- }
- #[cfg(not(feature="std"))] {
- Error { code: error.code() }
- }
- }
-}
-
-#[cfg(feature="std")]
-impl std::error::Error for Error {
- #[inline]
- fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
- self.inner.source()
- }
-}
-
-#[cfg(feature="std")]
-impl From<Error> for std::io::Error {
- #[inline]
- fn from(error: Error) -> Self {
- if let Some(code) = error.raw_os_error() {
- std::io::Error::from_raw_os_error(code)
- } else {
- std::io::Error::new(std::io::ErrorKind::Other, error)
- }
- }
-}
-
-#[cfg(feature="std")]
-#[derive(Debug, Copy, Clone)]
-struct ErrorCode(NonZeroU32);
-
-#[cfg(feature="std")]
-impl fmt::Display for ErrorCode {
- fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
- write!(f, "error code {}", self.0)
- }
-}
-
-#[cfg(feature="std")]
-impl std::error::Error for ErrorCode {}
diff --git a/rand/rand_core/src/impls.rs b/rand/rand_core/src/impls.rs
deleted file mode 100644
index dee4ed1..0000000
--- a/rand/rand_core/src/impls.rs
+++ /dev/null
@@ -1,158 +0,0 @@
-// 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::ptr::copy_nonoverlapping;
-use core::slice;
-use core::cmp::min;
-use core::mem::size_of;
-use crate::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] = rng.next_u64().to_le_bytes();
- l.copy_from_slice(&chunk);
- }
- let n = left.len();
- if n > 4 {
- let chunk: [u8; 8] = rng.next_u64().to_le_bytes();
- left.copy_from_slice(&chunk[..n]);
- } else if n > 0 {
- let chunk: [u8; 4] = rng.next_u32().to_le_bytes();
- 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
diff --git a/rand/rand_core/src/le.rs b/rand/rand_core/src/le.rs
deleted file mode 100644
index 266651f..0000000
--- a/rand/rand_core/src/le.rs
+++ /dev/null
@@ -1,68 +0,0 @@
-// 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);
-}
diff --git a/rand/rand_core/src/lib.rs b/rand/rand_core/src/lib.rs
deleted file mode 100644
index d8e0189..0000000
--- a/rand/rand_core/src/lib.rs
+++ /dev/null
@@ -1,492 +0,0 @@
-// 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 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))))]
-
-#![allow(clippy::unreadable_literal)]
-
-#![cfg_attr(not(feature="std"), no_std)]
-
-
-use core::default::Default;
-use core::convert::AsMut;
-use core::ptr::copy_nonoverlapping;
-
-#[cfg(all(feature="alloc", not(feature="std")))] extern crate alloc;
-#[cfg(all(feature="alloc", not(feature="std")))] use alloc::boxed::Box;
-
-pub use error::Error;
-#[cfg(feature="getrandom")] pub use os::OsRng;
-
-
-mod error;
-pub mod block;
-pub mod impls;
-pub mod le;
-#[cfg(feature="getrandom")] mod os;
-
-
-/// The core of a random number generator.
-///
-/// This trait encapsulates the low-level functionality common to all
-/// generators, and is the "back end", to be implemented by generators.
-/// End users should normally use the `Rng` trait from the [`rand`] crate,
-/// which is automatically implemented for every type implementing `RngCore`.
-///
-/// Three different methods for generating random data are provided since the
-/// optimal implementation of each is dependent on the type of generator. There
-/// is no required relationship between the output of each; e.g. many
-/// implementations of [`fill_bytes`] consume a whole number of `u32` or `u64`
-/// values and drop any remaining unused bytes.
-///
-/// The [`try_fill_bytes`] method is a variant of [`fill_bytes`] allowing error
-/// handling; it is not deemed sufficiently useful to add equivalents for
-/// [`next_u32`] or [`next_u64`] since the latter methods are almost always used
-/// with algorithmic generators (PRNGs), which are normally infallible.
-///
-/// Algorithmic generators implementing [`SeedableRng`] should normally have
-/// *portable, reproducible* output, i.e. fix Endianness when converting values
-/// to avoid platform differences, and avoid making any changes which affect
-/// output (except by communicating that the release has breaking changes).
-///
-/// Typically implementators will implement only one of the methods available
-/// in this trait directly, then use the helper functions from the
-/// [`impls`] module to implement the other methods.
-///
-/// It is recommended that implementations also implement:
-///
-/// - `Debug` with a custom implementation which *does not* print any internal
-/// state (at least, [`CryptoRng`]s should not risk leaking state through
-/// `Debug`).
-/// - `Serialize` and `Deserialize` (from Serde), preferably making Serde
-/// support optional at the crate level in PRNG libs.
-/// - `Clone`, if possible.
-/// - *never* implement `Copy` (accidental copies may cause repeated values).
-/// - *do not* implement `Default` for pseudorandom generators, but instead
-/// implement [`SeedableRng`], to guide users towards proper seeding.
-/// External / hardware RNGs can choose to implement `Default`.
-/// - `Eq` and `PartialEq` could be implemented, but are probably not useful.
-///
-/// # Example
-///
-/// A simple example, obviously not generating very *random* output:
-///
-/// ```
-/// #![allow(dead_code)]
-/// use rand_core::{RngCore, Error, impls};
-///
-/// struct CountingRng(u64);
-///
-/// impl RngCore for CountingRng {
-/// fn next_u32(&mut self) -> u32 {
-/// self.next_u64() as u32
-/// }
-///
-/// fn next_u64(&mut self) -> u64 {
-/// self.0 += 1;
-/// self.0
-/// }
-///
-/// fn fill_bytes(&mut self, dest: &mut [u8]) {
-/// impls::fill_bytes_via_next(self, dest)
-/// }
-///
-/// fn try_fill_bytes(&mut self, dest: &mut [u8]) -> Result<(), Error> {
-/// Ok(self.fill_bytes(dest))
-/// }
-/// }
-/// ```
-///
-/// [`rand`]: https://docs.rs/rand
-/// [`try_fill_bytes`]: RngCore::try_fill_bytes
-/// [`fill_bytes`]: RngCore::fill_bytes
-/// [`next_u32`]: RngCore::next_u32
-/// [`next_u64`]: RngCore::next_u64
-pub trait RngCore {
- /// Return the next random `u32`.
- ///
- /// RNGs must implement at least one method from this trait directly. In
- /// the case this method is not implemented directly, it can be implemented
- /// using `self.next_u64() as u32` or via
- /// [`fill_bytes`](impls::next_u32_via_fill).
- fn next_u32(&mut self) -> u32;
-
- /// Return the next random `u64`.
- ///
- /// RNGs must implement at least one method from this trait directly. In
- /// the case this method is not implemented directly, it can be implemented
- /// via [`next_u32`](impls::next_u64_via_u32) or via
- /// [`fill_bytes`](impls::next_u64_via_fill).
- fn next_u64(&mut self) -> u64;
-
- /// Fill `dest` with random data.
- ///
- /// RNGs must implement at least one method from this trait directly. In
- /// the case this method is not implemented directly, it can be implemented
- /// via [`next_u*`](impls::fill_bytes_via_next) or
- /// via [`try_fill_bytes`](RngCore::try_fill_bytes); if this generator can
- /// fail the implementation must choose how best to handle errors here
- /// (e.g. panic with a descriptive message or log a warning and retry a few
- /// times).
- ///
- /// This method should guarantee that `dest` is entirely filled
- /// with new data, and may panic if this is impossible
- /// (e.g. reading past the end of a file that is being used as the
- /// source of randomness).
- fn fill_bytes(&mut self, dest: &mut [u8]);
-
- /// Fill `dest` entirely with random data.
- ///
- /// This is the only method which allows an RNG to report errors while
- /// generating random data thus making this the primary method implemented
- /// by external (true) RNGs (e.g. `OsRng`) which can fail. It may be used
- /// directly to generate keys and to seed (infallible) PRNGs.
- ///
- /// Other than error handling, this method is identical to [`fill_bytes`];
- /// thus this may be implemented using `Ok(self.fill_bytes(dest))` or
- /// `fill_bytes` may be implemented with
- /// `self.try_fill_bytes(dest).unwrap()` or more specific error handling.
- ///
- /// [`fill_bytes`]: RngCore::fill_bytes
- fn try_fill_bytes(&mut self, dest: &mut [u8]) -> Result<(), Error>;
-}
-
-/// A marker trait used to indicate that an [`RngCore`] or [`BlockRngCore`]
-/// implementation is supposed to be cryptographically secure.
-///
-/// *Cryptographically secure generators*, also known as *CSPRNGs*, should
-/// satisfy an additional properties over other generators: given the first
-/// *k* bits of an algorithm's output
-/// sequence, it should not be possible using polynomial-time algorithms to
-/// predict the next bit with probability significantly greater than 50%.
-///
-/// Some generators may satisfy an additional property, however this is not
-/// required by this trait: if the CSPRNG's state is revealed, it should not be
-/// computationally-feasible to reconstruct output prior to this. Some other
-/// generators allow backwards-computation and are consided *reversible*.
-///
-/// Note that this trait is provided for guidance only and cannot guarantee
-/// suitability for cryptographic applications. In general it should only be
-/// implemented for well-reviewed code implementing well-regarded algorithms.
-///
-/// Note also that use of a `CryptoRng` does not protect against other
-/// weaknesses such as seeding from a weak entropy source or leaking state.
-///
-/// [`BlockRngCore`]: block::BlockRngCore
-pub trait CryptoRng {}
-
-/// A random number generator that can be explicitly seeded.
-///
-/// This trait encapsulates the low-level functionality common to all
-/// pseudo-random number generators (PRNGs, or algorithmic generators).
-///
-/// [`rand`]: https://docs.rs/rand
-pub trait SeedableRng: Sized {
- /// Seed type, which is restricted to types mutably-dereferencable as `u8`
- /// arrays (we recommend `[u8; N]` for some `N`).
- ///
- /// It is recommended to seed PRNGs with a seed of at least circa 100 bits,
- /// which means an array of `[u8; 12]` or greater to avoid picking RNGs with
- /// partially overlapping periods.
- ///
- /// For cryptographic RNG's a seed of 256 bits is recommended, `[u8; 32]`.
- ///
- ///
- /// # Implementing `SeedableRng` for RNGs with large seeds
- ///
- /// Note that the required traits `core::default::Default` and
- /// `core::convert::AsMut<u8>` are not implemented for large arrays
- /// `[u8; N]` with `N` > 32. To be able to implement the traits required by
- /// `SeedableRng` for RNGs with such large seeds, the newtype pattern can be
- /// used:
- ///
- /// ```
- /// use rand_core::SeedableRng;
- ///
- /// const N: usize = 64;
- /// pub struct MyRngSeed(pub [u8; N]);
- /// pub struct MyRng(MyRngSeed);
- ///
- /// impl Default for MyRngSeed {
- /// fn default() -> MyRngSeed {
- /// MyRngSeed([0; N])
- /// }
- /// }
- ///
- /// impl AsMut<[u8]> for MyRngSeed {
- /// fn as_mut(&mut self) -> &mut [u8] {
- /// &mut self.0
- /// }
- /// }
- ///
- /// impl SeedableRng for MyRng {
- /// type Seed = MyRngSeed;
- ///
- /// fn from_seed(seed: MyRngSeed) -> MyRng {
- /// MyRng(seed)
- /// }
- /// }
- /// ```
- type Seed: Sized + Default + AsMut<[u8]>;
-
- /// Create a new PRNG using the given seed.
- ///
- /// PRNG implementations are allowed to assume that bits in the seed are
- /// well distributed. That means usually that the number of one and zero
- /// bits are roughly equal, and values like 0, 1 and (size - 1) are unlikely.
- /// Note that many non-cryptographic PRNGs will show poor quality output
- /// if this is not adhered to. If you wish to seed from simple numbers, use
- /// `seed_from_u64` instead.
- ///
- /// All PRNG implementations should be reproducible unless otherwise noted:
- /// given a fixed `seed`, the same sequence of output should be produced
- /// on all runs, library versions and architectures (e.g. check endianness).
- /// Any "value-breaking" changes to the generator should require bumping at
- /// least the minor version and documentation of the change.
- ///
- /// It is not required that this function yield the same state as a
- /// reference implementation of the PRNG given equivalent seed; if necessary
- /// another constructor replicating behaviour from a reference
- /// implementation can be added.
- ///
- /// PRNG implementations should make sure `from_seed` never panics. In the
- /// case that some special values (like an all zero seed) are not viable
- /// seeds it is preferable to map these to alternative constant value(s),
- /// for example `0xBAD5EEDu32` or `0x0DDB1A5E5BAD5EEDu64` ("odd biases? bad
- /// seed"). This is assuming only a small number of values must be rejected.
- fn from_seed(seed: Self::Seed) -> Self;
-
- /// Create a new PRNG using a `u64` seed.
- ///
- /// This is a convenience-wrapper around `from_seed` to allow construction
- /// of any `SeedableRng` from a simple `u64` value. It is designed such that
- /// low Hamming Weight numbers like 0 and 1 can be used and should still
- /// result in good, independent seeds to the PRNG which is returned.
- ///
- /// This **is not suitable for cryptography**, as should be clear given that
- /// the input size is only 64 bits.
- ///
- /// Implementations for PRNGs *may* provide their own implementations of
- /// this function, but the default implementation should be good enough for
- /// all purposes. *Changing* the implementation of this function should be
- /// considered a value-breaking change.
- fn seed_from_u64(mut state: u64) -> Self {
- // We use PCG32 to generate a u32 sequence, and copy to the seed
- const MUL: u64 = 6364136223846793005;
- const INC: u64 = 11634580027462260723;
-
- let mut seed = Self::Seed::default();
- for chunk in seed.as_mut().chunks_mut(4) {
- // We advance the state first (to get away from the input value,
- // in case it has low Hamming Weight).
- state = state.wrapping_mul(MUL).wrapping_add(INC);
-
- // Use PCG output function with to_le to generate x:
- let xorshifted = (((state >> 18) ^ state) >> 27) as u32;
- let rot = (state >> 59) as u32;
- let x = xorshifted.rotate_right(rot).to_le();
-
- unsafe {
- let p = &x as *const u32 as *const u8;
- copy_nonoverlapping(p, chunk.as_mut_ptr(), chunk.len());
- }
- }
-
- Self::from_seed(seed)
- }
-
- /// Create a new PRNG seeded from another `Rng`.
- ///
- /// This may be useful when needing to rapidly seed many PRNGs from a master
- /// PRNG, and to allow forking of PRNGs. It may be considered deterministic.
- ///
- /// The master PRNG should be at least as high quality as the child PRNGs.
- /// When seeding non-cryptographic child PRNGs, we recommend using a
- /// different algorithm for the master PRNG (ideally a CSPRNG) to avoid
- /// correlations between the child PRNGs. If this is not possible (e.g.
- /// forking using small non-crypto PRNGs) ensure that your PRNG has a good
- /// mixing function on the output or consider use of a hash function with
- /// `from_seed`.
- ///
- /// Note that seeding `XorShiftRng` from another `XorShiftRng` provides an
- /// extreme example of what can go wrong: the new PRNG will be a clone
- /// of the parent.
- ///
- /// PRNG implementations are allowed to assume that a good RNG is provided
- /// for seeding, and that it is cryptographically secure when appropriate.
- /// As of `rand` 0.7 / `rand_core` 0.5, implementations overriding this
- /// method should ensure the implementation satisfies reproducibility
- /// (in prior versions this was not required).
- ///
- /// [`rand`]: https://docs.rs/rand
- /// [`rand_os`]: https://docs.rs/rand_os
- fn from_rng<R: RngCore>(mut rng: R) -> Result<Self, Error> {
- let mut seed = Self::Seed::default();
- rng.try_fill_bytes(seed.as_mut())?;
- Ok(Self::from_seed(seed))
- }
-
- /// Creates a new instance of the RNG seeded via [`getrandom`].
- ///
- /// This method is the recommended way to construct non-deterministic PRNGs
- /// since it is convenient and secure.
- ///
- /// In case the overhead of using [`getrandom`] to seed *many* PRNGs is an
- /// issue, one may prefer to seed from a local PRNG, e.g.
- /// `from_rng(thread_rng()).unwrap()`.
- ///
- /// # Panics
- ///
- /// If [`getrandom`] is unable to provide secure entropy this method will panic.
- ///
- /// [`getrandom`]: https://docs.rs/getrandom
- #[cfg(feature="getrandom")]
- fn from_entropy() -> Self {
- let mut seed = Self::Seed::default();
- if let Err(err) = getrandom::getrandom(seed.as_mut()) {
- panic!("from_entropy failed: {}", err);
- }
- Self::from_seed(seed)
- }
-}
-
-// Implement `RngCore` for references to an `RngCore`.
-// Force inlining all functions, so that it is up to the `RngCore`
-// implementation and the optimizer to decide on inlining.
-impl<'a, R: RngCore + ?Sized> RngCore for &'a mut R {
- #[inline(always)]
- fn next_u32(&mut self) -> u32 {
- (**self).next_u32()
- }
-
- #[inline(always)]
- fn next_u64(&mut self) -> u64 {
- (**self).next_u64()
- }
-
- #[inline(always)]
- fn fill_bytes(&mut self, dest: &mut [u8]) {
- (**self).fill_bytes(dest)
- }
-
- #[inline(always)]
- fn try_fill_bytes(&mut self, dest: &mut [u8]) -> Result<(), Error> {
- (**self).try_fill_bytes(dest)
- }
-}
-
-// Implement `RngCore` for boxed references to an `RngCore`.
-// Force inlining all functions, so that it is up to the `RngCore`
-// implementation and the optimizer to decide on inlining.
-#[cfg(feature="alloc")]
-impl<R: RngCore + ?Sized> RngCore for Box<R> {
- #[inline(always)]
- fn next_u32(&mut self) -> u32 {
- (**self).next_u32()
- }
-
- #[inline(always)]
- fn next_u64(&mut self) -> u64 {
- (**self).next_u64()
- }
-
- #[inline(always)]
- fn fill_bytes(&mut self, dest: &mut [u8]) {
- (**self).fill_bytes(dest)
- }
-
- #[inline(always)]
- fn try_fill_bytes(&mut self, dest: &mut [u8]) -> Result<(), Error> {
- (**self).try_fill_bytes(dest)
- }
-}
-
-#[cfg(feature="std")]
-impl std::io::Read for dyn RngCore {
- fn read(&mut self, buf: &mut [u8]) -> Result<usize, std::io::Error> {
- self.try_fill_bytes(buf)?;
- Ok(buf.len())
- }
-}
-
-// Implement `CryptoRng` for references to an `CryptoRng`.
-impl<'a, R: CryptoRng + ?Sized> CryptoRng for &'a mut R {}
-
-// Implement `CryptoRng` for boxed references to an `CryptoRng`.
-#[cfg(feature="alloc")]
-impl<R: CryptoRng + ?Sized> CryptoRng for Box<R> {}
-
-#[cfg(test)]
-mod test {
- use super::*;
-
- #[test]
- fn test_seed_from_u64() {
- struct SeedableNum(u64);
- impl SeedableRng for SeedableNum {
- type Seed = [u8; 8];
- fn from_seed(seed: Self::Seed) -> Self {
- let mut x = [0u64; 1];
- le::read_u64_into(&seed, &mut x);
- SeedableNum(x[0])
- }
- }
-
- const N: usize = 8;
- const SEEDS: [u64; N] = [0u64, 1, 2, 3, 4, 8, 16, -1i64 as u64];
- let mut results = [0u64; N];
- for (i, seed) in SEEDS.iter().enumerate() {
- let SeedableNum(x) = SeedableNum::seed_from_u64(*seed);
- results[i] = x;
- }
-
- for (i1, r1) in results.iter().enumerate() {
- let weight = r1.count_ones();
- // This is the binomial distribution B(64, 0.5), so chance of
- // weight < 20 is binocdf(19, 64, 0.5) = 7.8e-4, and same for
- // weight > 44.
- assert!(weight >= 20 && weight <= 44);
-
- for (i2, r2) in results.iter().enumerate() {
- if i1 == i2 { continue; }
- let diff_weight = (r1 ^ r2).count_ones();
- assert!(diff_weight >= 20);
- }
- }
-
- // value-breakage test:
- assert_eq!(results[0], 5029875928683246316);
- }
-}
diff --git a/rand/rand_core/src/os.rs b/rand/rand_core/src/os.rs
deleted file mode 100644
index fc23a57..0000000
--- a/rand/rand_core/src/os.rs
+++ /dev/null
@@ -1,85 +0,0 @@
-// Copyright 2019 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.
-
-//! Interface to the random number generator of the operating system.
-// Note: keep this code in sync with the rand_os crate!
-
-use getrandom::getrandom;
-use crate::{CryptoRng, RngCore, Error, impls};
-
-/// A random number generator that retrieves randomness from from the
-/// operating system.
-///
-/// This is a zero-sized struct. It can be freely constructed with `OsRng`.
-///
-/// The implementation is provided by the [getrandom] crate. Refer to
-/// [getrandom] documentation for details.
-///
-/// This struct is only available when specifying the crate feature `getrandom`
-/// or `std`. When using the `rand` lib, it is also available as `rand::rngs::OsRng`.
-///
-/// # Blocking and error handling
-///
-/// It is possible that when used during early boot the first call to `OsRng`
-/// will block until the system's RNG is initialised. It is also possible
-/// (though highly unlikely) for `OsRng` to fail on some platforms, most
-/// likely due to system mis-configuration.
-///
-/// After the first successful call, it is highly unlikely that failures or
-/// significant delays will occur (although performance should be expected to
-/// be much slower than a user-space PRNG).
-///
-/// # Usage example
-/// ```
-/// use rand_core::{RngCore, OsRng};
-///
-/// let mut key = [0u8; 16];
-/// OsRng.fill_bytes(&mut key);
-/// let random_u64 = OsRng.next_u64();
-/// ```
-///
-/// [getrandom]: https://crates.io/crates/getrandom
-#[derive(Clone, Copy, Debug, Default)]
-pub struct 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]) {
- if let Err(e) = self.try_fill_bytes(dest) {
- panic!("Error: {}", e);
- }
- }
-
- fn try_fill_bytes(&mut self, dest: &mut [u8]) -> Result<(), Error> {
- getrandom(dest)?;
- Ok(())
- }
-}
-
-#[test]
-fn test_os_rng() {
- let x = OsRng.next_u64();
- let y = OsRng.next_u64();
- assert!(x != 0);
- assert!(x != y);
-}
-
-#[test]
-fn test_construction() {
- let mut rng = OsRng::default();
- assert!(rng.next_u64() != 0);
-}