Remove vendored dependencies

While it appears that by now we actually can get successful builds
without Cargo insisting on Internet access by virtue of using the
--frozen flag, maintaining vendored dependencies is somewhat of a pain
point. This state will also get worse with upcoming changes that replace
argparse in favor of structopt and pull in a slew of new dependencies by
doing so. Then there is also the repository structure aspect, which is
non-standard due to the way we vendor dependencies and a potential
source of confusion.
In order to fix these problems, this change removes all the vendored
dependencies we have.

Delete subrepo argparse/:argparse
Delete subrepo base32/:base32
Delete subrepo cc/:cc
Delete subrepo cfg-if/:cfg-if
Delete subrepo getrandom/:getrandom
Delete subrepo lazy-static/:lazy-static
Delete subrepo libc/:libc
Delete subrepo nitrokey-sys/:nitrokey-sys
Delete subrepo nitrokey/:nitrokey
Delete subrepo rand/:rand

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 @@
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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
-
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-person obtaining a copy of this software and associated
-documentation files (the "Software"), to deal in the
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-TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
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-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);
-}