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authorDaniel Mueller <deso@posteo.net>2019-01-02 21:14:10 -0800
committerDaniel Mueller <deso@posteo.net>2019-01-02 21:14:10 -0800
commitecf3474223ca3d16a10f12dc2272e3b0ed72c1bb (patch)
tree03134a683791176b49ef5c92e8d6acd24c3b5a9b /rand/src/reseeding.rs
parent686f61b75055ecb02baf9d9449525ae447a3bed1 (diff)
downloadnitrocli-ecf3474223ca3d16a10f12dc2272e3b0ed72c1bb.tar.gz
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Update nitrokey crate to 0.2.3
This change updates the nitrokey crate to version 0.2.3. This version bumps the rand crate used to 0.6.1, which in turn requires an additional set of dependencies. Import subrepo nitrokey/:nitrokey at b3e2adc5bb1300441ca74cc7672617c042f3ea31 Import subrepo rand/:rand at 73613ff903512e9503e41cc8ba9eae76269dc598 Import subrepo rustc_version/:rustc_version at 0294f2ba2018bf7be672abd53db351ce5055fa02 Import subrepo semver-parser/:semver-parser at 750da9b11a04125231b1fb293866ca036845acee Import subrepo semver/:semver at 5eb6db94fa03f4d5c64a625a56188f496be47598
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-rw-r--r--rand/src/reseeding.rs229
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diff --git a/rand/src/reseeding.rs b/rand/src/reseeding.rs
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-// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// 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. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-//! A wrapper around another RNG that reseeds it after it
-//! generates a certain number of random bytes.
-
-use core::default::Default;
-
-use {Rng, SeedableRng};
-
-/// How many bytes of entropy the underling RNG is allowed to generate
-/// before it is reseeded
-const DEFAULT_GENERATION_THRESHOLD: u64 = 32 * 1024;
-
-/// A wrapper around any RNG which reseeds the underlying RNG after it
-/// has generated a certain number of random bytes.
-#[derive(Debug)]
-pub struct ReseedingRng<R, Rsdr> {
- rng: R,
- generation_threshold: u64,
- bytes_generated: u64,
- /// Controls the behaviour when reseeding the RNG.
- pub reseeder: Rsdr,
-}
-
-impl<R: Rng, Rsdr: Reseeder<R>> ReseedingRng<R, Rsdr> {
- /// Create a new `ReseedingRng` with the given parameters.
- ///
- /// # Arguments
- ///
- /// * `rng`: the random number generator to use.
- /// * `generation_threshold`: the number of bytes of entropy at which to reseed the RNG.
- /// * `reseeder`: the reseeding object to use.
- pub fn new(rng: R, generation_threshold: u64, reseeder: Rsdr) -> ReseedingRng<R,Rsdr> {
- ReseedingRng {
- rng: rng,
- generation_threshold: generation_threshold,
- bytes_generated: 0,
- reseeder: reseeder
- }
- }
-
- /// Reseed the internal RNG if the number of bytes that have been
- /// generated exceed the threshold.
- pub fn reseed_if_necessary(&mut self) {
- if self.bytes_generated >= self.generation_threshold {
- self.reseeder.reseed(&mut self.rng);
- self.bytes_generated = 0;
- }
- }
-}
-
-
-impl<R: Rng, Rsdr: Reseeder<R>> Rng for ReseedingRng<R, Rsdr> {
- fn next_u32(&mut self) -> u32 {
- self.reseed_if_necessary();
- self.bytes_generated += 4;
- self.rng.next_u32()
- }
-
- fn next_u64(&mut self) -> u64 {
- self.reseed_if_necessary();
- self.bytes_generated += 8;
- self.rng.next_u64()
- }
-
- fn fill_bytes(&mut self, dest: &mut [u8]) {
- self.reseed_if_necessary();
- self.bytes_generated += dest.len() as u64;
- self.rng.fill_bytes(dest)
- }
-}
-
-impl<S, R: SeedableRng<S>, Rsdr: Reseeder<R> + Default>
- SeedableRng<(Rsdr, S)> for ReseedingRng<R, Rsdr> {
- fn reseed(&mut self, (rsdr, seed): (Rsdr, S)) {
- self.rng.reseed(seed);
- self.reseeder = rsdr;
- self.bytes_generated = 0;
- }
-
- /// Create a new `ReseedingRng` from the given reseeder and
- /// seed. This uses a default value for `generation_threshold`.
- fn from_seed((rsdr, seed): (Rsdr, S)) -> ReseedingRng<R, Rsdr> {
- ReseedingRng {
- rng: SeedableRng::from_seed(seed),
- generation_threshold: DEFAULT_GENERATION_THRESHOLD,
- bytes_generated: 0,
- reseeder: rsdr
- }
- }
-}
-
-/// Something that can be used to reseed an RNG via `ReseedingRng`.
-///
-/// # Example
-///
-/// ```rust
-/// use rand::{Rng, SeedableRng, StdRng};
-/// use rand::reseeding::{Reseeder, ReseedingRng};
-///
-/// struct TickTockReseeder { tick: bool }
-/// impl Reseeder<StdRng> for TickTockReseeder {
-/// fn reseed(&mut self, rng: &mut StdRng) {
-/// let val = if self.tick {0} else {1};
-/// rng.reseed(&[val]);
-/// self.tick = !self.tick;
-/// }
-/// }
-/// fn main() {
-/// let rsdr = TickTockReseeder { tick: true };
-///
-/// let inner = StdRng::new().unwrap();
-/// let mut rng = ReseedingRng::new(inner, 10, rsdr);
-///
-/// // this will repeat, because it gets reseeded very regularly.
-/// let s: String = rng.gen_ascii_chars().take(100).collect();
-/// println!("{}", s);
-/// }
-///
-/// ```
-pub trait Reseeder<R> {
- /// Reseed the given RNG.
- fn reseed(&mut self, rng: &mut R);
-}
-
-/// Reseed an RNG using a `Default` instance. This reseeds by
-/// replacing the RNG with the result of a `Default::default` call.
-#[derive(Clone, Copy, Debug)]
-pub struct ReseedWithDefault;
-
-impl<R: Rng + Default> Reseeder<R> for ReseedWithDefault {
- fn reseed(&mut self, rng: &mut R) {
- *rng = Default::default();
- }
-}
-impl Default for ReseedWithDefault {
- fn default() -> ReseedWithDefault { ReseedWithDefault }
-}
-
-#[cfg(test)]
-mod test {
- use std::default::Default;
- use std::iter::repeat;
- use super::{ReseedingRng, ReseedWithDefault};
- use {SeedableRng, Rng};
-
- struct Counter {
- i: u32
- }
-
- impl Rng for Counter {
- fn next_u32(&mut self) -> u32 {
- self.i += 1;
- // very random
- self.i - 1
- }
- }
- impl Default for Counter {
- fn default() -> Counter {
- Counter { i: 0 }
- }
- }
- impl SeedableRng<u32> for Counter {
- fn reseed(&mut self, seed: u32) {
- self.i = seed;
- }
- fn from_seed(seed: u32) -> Counter {
- Counter { i: seed }
- }
- }
- type MyRng = ReseedingRng<Counter, ReseedWithDefault>;
-
- #[test]
- fn test_reseeding() {
- let mut rs = ReseedingRng::new(Counter {i:0}, 400, ReseedWithDefault);
-
- let mut i = 0;
- for _ in 0..1000 {
- assert_eq!(rs.next_u32(), i % 100);
- i += 1;
- }
- }
-
- #[test]
- fn test_rng_seeded() {
- let mut ra: MyRng = SeedableRng::from_seed((ReseedWithDefault, 2));
- let mut rb: MyRng = SeedableRng::from_seed((ReseedWithDefault, 2));
- assert!(::test::iter_eq(ra.gen_ascii_chars().take(100),
- rb.gen_ascii_chars().take(100)));
- }
-
- #[test]
- fn test_rng_reseed() {
- let mut r: MyRng = SeedableRng::from_seed((ReseedWithDefault, 3));
- let string1: String = r.gen_ascii_chars().take(100).collect();
-
- r.reseed((ReseedWithDefault, 3));
-
- let string2: String = r.gen_ascii_chars().take(100).collect();
- assert_eq!(string1, string2);
- }
-
- const FILL_BYTES_V_LEN: usize = 13579;
- #[test]
- fn test_rng_fill_bytes() {
- let mut v = repeat(0u8).take(FILL_BYTES_V_LEN).collect::<Vec<_>>();
- ::test::rng().fill_bytes(&mut v);
-
- // Sanity test: if we've gotten here, `fill_bytes` has not infinitely
- // recursed.
- assert_eq!(v.len(), FILL_BYTES_V_LEN);
-
- // To test that `fill_bytes` actually did something, check that the
- // average of `v` is not 0.
- let mut sum = 0.0;
- for &x in v.iter() {
- sum += x as f64;
- }
- assert!(sum / v.len() as f64 != 0.0);
- }
-}