aboutsummaryrefslogtreecommitdiff
path: root/rand/rand_xoshiro/src/xoshiro256plus.rs
diff options
context:
space:
mode:
authorDaniel Mueller <deso@posteo.net>2020-04-04 14:39:19 -0700
committerDaniel Mueller <deso@posteo.net>2020-04-04 14:39:19 -0700
commitd0d9683df8398696147e7ee1fcffb2e4e957008c (patch)
tree4baa76712a76f4d072ee3936c07956580b230820 /rand/rand_xoshiro/src/xoshiro256plus.rs
parent203e691f46d591a2cc8acdfd850fa9f5b0fb8a98 (diff)
downloadnitrocli-d0d9683df8398696147e7ee1fcffb2e4e957008c.tar.gz
nitrocli-d0d9683df8398696147e7ee1fcffb2e4e957008c.tar.bz2
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
Diffstat (limited to 'rand/rand_xoshiro/src/xoshiro256plus.rs')
-rw-r--r--rand/rand_xoshiro/src/xoshiro256plus.rs131
1 files changed, 0 insertions, 131 deletions
diff --git a/rand/rand_xoshiro/src/xoshiro256plus.rs b/rand/rand_xoshiro/src/xoshiro256plus.rs
deleted file mode 100644
index 396f588..0000000
--- a/rand/rand_xoshiro/src/xoshiro256plus.rs
+++ /dev/null
@@ -1,131 +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.
-
-#[cfg(feature="serde1")] use serde::{Serialize, Deserialize};
-use rand_core::impls::fill_bytes_via_next;
-use rand_core::le::read_u64_into;
-use rand_core::{SeedableRng, RngCore, Error};
-
-/// A xoshiro256+ random number generator.
-///
-/// The xoshiro256+ algorithm is not suitable for cryptographic purposes, but
-/// is very fast and has good statistical properties, besides a low linear
-/// complexity in the lowest bits.
-///
-/// The algorithm used here is translated from [the `xoshiro256plus.c`
-/// reference source code](http://xoshiro.di.unimi.it/xoshiro256plus.c) by
-/// David Blackman and Sebastiano Vigna.
-#[derive(Debug, Clone)]
-#[cfg_attr(feature="serde1", derive(Serialize, Deserialize))]
-pub struct Xoshiro256Plus {
- s: [u64; 4],
-}
-
-impl Xoshiro256Plus {
- /// Jump forward, equivalently to 2^128 calls to `next_u64()`.
- ///
- /// This can be used to generate 2^128 non-overlapping subsequences for
- /// parallel computations.
- ///
- /// ```
- /// use rand_xoshiro::rand_core::SeedableRng;
- /// use rand_xoshiro::Xoshiro256Plus;
- ///
- /// let rng1 = Xoshiro256Plus::seed_from_u64(0);
- /// let mut rng2 = rng1.clone();
- /// rng2.jump();
- /// let mut rng3 = rng2.clone();
- /// rng3.jump();
- /// ```
- pub fn jump(&mut self) {
- impl_jump!(u64, self, [
- 0x180ec6d33cfd0aba, 0xd5a61266f0c9392c,
- 0xa9582618e03fc9aa, 0x39abdc4529b1661c
- ]);
- }
-
- /// Jump forward, equivalently to 2^192 calls to `next_u64()`.
- ///
- /// This can be used to generate 2^64 starting points, from each of which
- /// `jump()` will generate 2^64 non-overlapping subsequences for parallel
- /// distributed computations.
- pub fn long_jump(&mut self) {
- impl_jump!(u64, self, [
- 0x76e15d3efefdcbbf, 0xc5004e441c522fb3,
- 0x77710069854ee241, 0x39109bb02acbe635
- ]);
- }
-}
-
-impl SeedableRng for Xoshiro256Plus {
- type Seed = [u8; 32];
-
- /// Create a new `Xoshiro256Plus`. If `seed` is entirely 0, it will be
- /// mapped to a different seed.
- #[inline]
- fn from_seed(seed: [u8; 32]) -> Xoshiro256Plus {
- deal_with_zero_seed!(seed, Self);
- let mut state = [0; 4];
- read_u64_into(&seed, &mut state);
- Xoshiro256Plus { s: state }
- }
-
- /// Seed a `Xoshiro256Plus` from a `u64` using `SplitMix64`.
- fn seed_from_u64(seed: u64) -> Xoshiro256Plus {
- from_splitmix!(seed)
- }
-}
-
-impl RngCore for Xoshiro256Plus {
- #[inline]
- fn next_u32(&mut self) -> u32 {
- // The lowest bits have some linear dependencies, so we use the
- // upper bits instead.
- (self.next_u64() >> 32) as u32
- }
-
- #[inline]
- fn next_u64(&mut self) -> u64 {
- let result_plus = self.s[0].wrapping_add(self.s[3]);
- impl_xoshiro_u64!(self);
- result_plus
- }
-
- #[inline]
- fn fill_bytes(&mut self, dest: &mut [u8]) {
- fill_bytes_via_next(self, dest);
- }
-
- #[inline]
- fn try_fill_bytes(&mut self, dest: &mut [u8]) -> Result<(), Error> {
- self.fill_bytes(dest);
- Ok(())
- }
-}
-
-#[cfg(test)]
-mod tests {
- use super::*;
-
- #[test]
- fn reference() {
- let mut rng = Xoshiro256Plus::from_seed(
- [1, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0,
- 3, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0]);
- // These values were produced with the reference implementation:
- // http://xoshiro.di.unimi.it/xoshiro256plus.c
- let expected = [
- 5, 211106232532999, 211106635186183, 9223759065350669058,
- 9250833439874351877, 13862484359527728515, 2346507365006083650,
- 1168864526675804870, 34095955243042024, 3466914240207415127,
- ];
- for &e in &expected {
- assert_eq!(rng.next_u64(), e);
- }
- }
-}