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class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> +<span id="2">2</span> +<span id="3">3</span> +<span id="4">4</span> +<span id="5">5</span> +<span id="6">6</span> +<span id="7">7</span> +<span id="8">8</span> +<span id="9">9</span> +<span id="10">10</span> +<span id="11">11</span> +<span id="12">12</span> +<span id="13">13</span> +<span id="14">14</span> +<span id="15">15</span> +<span id="16">16</span> +<span id="17">17</span> +<span id="18">18</span> +<span id="19">19</span> +<span id="20">20</span> +<span id="21">21</span> +<span id="22">22</span> +<span id="23">23</span> +<span id="24">24</span> +<span id="25">25</span> +<span id="26">26</span> +<span id="27">27</span> +<span id="28">28</span> +<span id="29">29</span> +<span id="30">30</span> +<span id="31">31</span> +<span id="32">32</span> +<span id="33">33</span> +<span id="34">34</span> +<span id="35">35</span> +<span id="36">36</span> +<span id="37">37</span> +<span 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class="rust"><code><span class="comment">// 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. + +</span><span class="doccomment">//! The ChaCha random number generator. + +</span><span class="attribute">#[cfg(not(feature = <span class="string">"std"</span>))] </span><span class="kw">use </span>core; +<span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] </span><span class="kw">use </span>std <span class="kw">as </span>core; + +<span class="kw">use </span><span class="self">self</span>::core::fmt; +<span class="kw">use </span><span class="kw">crate</span>::guts::ChaCha; +<span class="kw">use </span>rand_core::block::{BlockRng, BlockRngCore}; +<span class="kw">use </span>rand_core::{CryptoRng, Error, RngCore, SeedableRng}; + +<span class="attribute">#[cfg(feature = <span class="string">"serde1"</span>)] </span><span class="kw">use </span>serde::{Serialize, Deserialize, Serializer, Deserializer}; + +<span class="comment">// NB. this must remain consistent with some currently hard-coded numbers in this module +</span><span class="kw">const </span>BUF_BLOCKS: u8 = <span class="number">4</span>; +<span class="comment">// number of 32-bit words per ChaCha block (fixed by algorithm definition) +</span><span class="kw">const </span>BLOCK_WORDS: u8 = <span class="number">16</span>; + +<span class="attribute">#[repr(transparent)] +</span><span class="kw">pub struct </span>Array64<T>([T; <span class="number">64</span>]); +<span class="kw">impl</span><T> Default <span class="kw">for </span>Array64<T> +<span class="kw">where </span>T: Default +{ + <span class="attribute">#[rustfmt::skip] + </span><span class="kw">fn </span>default() -> <span class="self">Self </span>{ + <span class="self">Self</span>([ + T::default(), T::default(), T::default(), T::default(), T::default(), T::default(), T::default(), T::default(), + T::default(), T::default(), T::default(), T::default(), T::default(), T::default(), T::default(), T::default(), + T::default(), T::default(), T::default(), T::default(), T::default(), T::default(), T::default(), T::default(), + T::default(), T::default(), T::default(), T::default(), T::default(), T::default(), T::default(), T::default(), + T::default(), T::default(), T::default(), T::default(), T::default(), T::default(), T::default(), T::default(), + T::default(), T::default(), T::default(), T::default(), T::default(), T::default(), T::default(), T::default(), + T::default(), T::default(), T::default(), T::default(), T::default(), T::default(), T::default(), T::default(), + T::default(), T::default(), T::default(), T::default(), T::default(), T::default(), T::default(), T::default(), + ]) + } +} +<span class="kw">impl</span><T> AsRef<[T]> <span class="kw">for </span>Array64<T> { + <span class="kw">fn </span>as_ref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>[T] { + <span class="kw-2">&</span><span class="self">self</span>.<span class="number">0 + </span>} +} +<span class="kw">impl</span><T> AsMut<[T]> <span class="kw">for </span>Array64<T> { + <span class="kw">fn </span>as_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span>[T] { + <span class="kw-2">&mut </span><span class="self">self</span>.<span class="number">0 + </span>} +} +<span class="kw">impl</span><T> Clone <span class="kw">for </span>Array64<T> +<span class="kw">where </span>T: Copy + Default +{ + <span class="kw">fn </span>clone(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self </span>{ + <span class="kw">let </span><span class="kw-2">mut </span>new = <span class="self">Self</span>::default(); + new.<span class="number">0</span>.copy_from_slice(<span class="kw-2">&</span><span class="self">self</span>.<span class="number">0</span>); + new + } +} +<span class="kw">impl</span><T> fmt::Debug <span class="kw">for </span>Array64<T> { + <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { + <span class="macro">write!</span>(f, <span class="string">"Array64 {{}}"</span>) + } +} + +<span class="macro">macro_rules! </span>chacha_impl { + (<span class="macro-nonterminal">$ChaChaXCore</span>:ident, <span class="macro-nonterminal">$ChaChaXRng</span>:ident, <span class="macro-nonterminal">$rounds</span>:expr, <span class="macro-nonterminal">$doc</span>:expr, <span class="macro-nonterminal">$abst</span>:ident) => { + <span class="attribute">#[doc=<span class="macro-nonterminal">$doc</span>] + #[derive(Clone, PartialEq, Eq)] + </span><span class="kw">pub struct </span><span class="macro-nonterminal">$ChaChaXCore </span>{ + state: ChaCha, + } + + <span class="comment">// Custom Debug implementation that does not expose the internal state + </span><span class="kw">impl </span>fmt::Debug <span class="kw">for </span><span class="macro-nonterminal">$ChaChaXCore </span>{ + <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { + <span class="macro">write!</span>(f, <span class="string">"ChaChaXCore {{}}"</span>) + } + } + + <span class="kw">impl </span>BlockRngCore <span class="kw">for </span><span class="macro-nonterminal">$ChaChaXCore </span>{ + <span class="kw">type </span>Item = u32; + <span class="kw">type </span>Results = Array64<u32>; + <span class="attribute">#[inline] + </span><span class="kw">fn </span>generate(<span class="kw-2">&mut </span><span class="self">self</span>, r: <span class="kw-2">&mut </span><span class="self">Self</span>::Results) { + <span class="comment">// Fill slice of words by writing to equivalent slice of bytes, then fixing endianness. + </span><span class="self">self</span>.state.refill4(<span class="macro-nonterminal">$rounds</span>, <span class="kw">unsafe </span>{ + <span class="kw-2">&mut *</span>(<span class="kw-2">&mut *</span>r <span class="kw">as </span><span class="kw-2">*mut </span>Array64<u32> <span class="kw">as </span><span class="kw-2">*mut </span>[u8; <span class="number">256</span>]) + }); + <span class="kw">for </span>x <span class="kw">in </span>r.as_mut() { + <span class="kw-2">*</span>x = x.to_le(); + } + } + } + + <span class="kw">impl </span>SeedableRng <span class="kw">for </span><span class="macro-nonterminal">$ChaChaXCore </span>{ + <span class="kw">type </span>Seed = [u8; <span class="number">32</span>]; + <span class="attribute">#[inline] + </span><span class="kw">fn </span>from_seed(seed: <span class="self">Self</span>::Seed) -> <span class="self">Self </span>{ + <span class="macro-nonterminal">$ChaChaXCore </span>{ state: ChaCha::new(<span class="kw-2">&</span>seed, <span class="kw-2">&</span>[<span class="number">0u8</span>; <span class="number">8</span>]) } + } + } + + <span class="kw">impl </span>CryptoRng <span class="kw">for </span><span class="macro-nonterminal">$ChaChaXCore </span>{} + + <span class="doccomment">/// A cryptographically secure random number generator that uses the ChaCha algorithm. + /// + /// ChaCha is a stream cipher designed by Daniel J. Bernstein[^1], that we use as an RNG. It is + /// an improved variant of the Salsa20 cipher family, which was selected as one of the "stream + /// ciphers suitable for widespread adoption" by eSTREAM[^2]. + /// + /// ChaCha uses add-rotate-xor (ARX) operations as its basis. These are safe against timing + /// attacks, although that is mostly a concern for ciphers and not for RNGs. We provide a SIMD + /// implementation to support high throughput on a variety of common hardware platforms. + /// + /// With the ChaCha algorithm it is possible to choose the number of rounds the core algorithm + /// should run. The number of rounds is a tradeoff between performance and security, where 8 + /// rounds is the minimum potentially secure configuration, and 20 rounds is widely used as a + /// conservative choice. + /// + /// We use a 64-bit counter and 64-bit stream identifier as in Bernstein's implementation[^1] + /// except that we use a stream identifier in place of a nonce. A 64-bit counter over 64-byte + /// (16 word) blocks allows 1 ZiB of output before cycling, and the stream identifier allows + /// 2<sup>64</sup> unique streams of output per seed. Both counter and stream are initialized + /// to zero but may be set via the `set_word_pos` and `set_stream` methods. + /// + /// The word layout is: + /// + /// ```text + /// constant constant constant constant + /// seed seed seed seed + /// seed seed seed seed + /// counter counter stream_id stream_id + /// ``` + /// + /// This implementation uses an output buffer of sixteen `u32` words, and uses + /// [`BlockRng`] to implement the [`RngCore`] methods. + /// + /// [^1]: D. J. Bernstein, [*ChaCha, a variant of Salsa20*]( + /// https://cr.yp.to/chacha.html) + /// + /// [^2]: [eSTREAM: the ECRYPT Stream Cipher Project]( + /// http://www.ecrypt.eu.org/stream/) + </span><span class="attribute">#[derive(Clone, Debug)] + </span><span class="kw">pub struct </span><span class="macro-nonterminal">$ChaChaXRng </span>{ + rng: BlockRng<<span class="macro-nonterminal">$ChaChaXCore</span>>, + } + + <span class="kw">impl </span>SeedableRng <span class="kw">for </span><span class="macro-nonterminal">$ChaChaXRng </span>{ + <span class="kw">type </span>Seed = [u8; <span class="number">32</span>]; + <span class="attribute">#[inline] + </span><span class="kw">fn </span>from_seed(seed: <span class="self">Self</span>::Seed) -> <span class="self">Self </span>{ + <span class="kw">let </span>core = <span class="macro-nonterminal">$ChaChaXCore::from_seed</span>(seed); + <span class="self">Self </span>{ + rng: BlockRng::new(core), + } + } + } + + <span class="kw">impl </span>RngCore <span class="kw">for </span><span class="macro-nonterminal">$ChaChaXRng </span>{ + <span class="attribute">#[inline] + </span><span class="kw">fn </span>next_u32(<span class="kw-2">&mut </span><span class="self">self</span>) -> u32 { + <span class="self">self</span>.rng.next_u32() + } + <span class="attribute">#[inline] + </span><span class="kw">fn </span>next_u64(<span class="kw-2">&mut </span><span class="self">self</span>) -> u64 { + <span class="self">self</span>.rng.next_u64() + } + <span class="attribute">#[inline] + </span><span class="kw">fn </span>fill_bytes(<span class="kw-2">&mut </span><span class="self">self</span>, bytes: <span class="kw-2">&mut </span>[u8]) { + <span class="self">self</span>.rng.fill_bytes(bytes) + } + <span class="attribute">#[inline] + </span><span class="kw">fn </span>try_fill_bytes(<span class="kw-2">&mut </span><span class="self">self</span>, bytes: <span class="kw-2">&mut </span>[u8]) -> <span class="prelude-ty">Result</span><(), Error> { + <span class="self">self</span>.rng.try_fill_bytes(bytes) + } + } + + <span class="kw">impl </span><span class="macro-nonterminal">$ChaChaXRng </span>{ + <span class="comment">// The buffer is a 4-block window, i.e. it is always at a block-aligned position in the + // stream but if the stream has been seeked it may not be self-aligned. + + </span><span class="doccomment">/// Get the offset from the start of the stream, in 32-bit words. + /// + /// Since the generated blocks are 16 words (2<sup>4</sup>) long and the + /// counter is 64-bits, the offset is a 68-bit number. Sub-word offsets are + /// not supported, hence the result can simply be multiplied by 4 to get a + /// byte-offset. + </span><span class="attribute">#[inline] + </span><span class="kw">pub fn </span>get_word_pos(<span class="kw-2">&</span><span class="self">self</span>) -> u128 { + <span class="kw">let </span>buf_start_block = { + <span class="kw">let </span>buf_end_block = <span class="self">self</span>.rng.core.state.get_block_pos(); + u64::wrapping_sub(buf_end_block, BUF_BLOCKS.into()) + }; + <span class="kw">let </span>(buf_offset_blocks, block_offset_words) = { + <span class="kw">let </span>buf_offset_words = <span class="self">self</span>.rng.index() <span class="kw">as </span>u64; + <span class="kw">let </span>blocks_part = buf_offset_words / u64::from(BLOCK_WORDS); + <span class="kw">let </span>words_part = buf_offset_words % u64::from(BLOCK_WORDS); + (blocks_part, words_part) + }; + <span class="kw">let </span>pos_block = u64::wrapping_add(buf_start_block, buf_offset_blocks); + <span class="kw">let </span>pos_block_words = u128::from(pos_block) * u128::from(BLOCK_WORDS); + pos_block_words + u128::from(block_offset_words) + } + + <span class="doccomment">/// Set the offset from the start of the stream, in 32-bit words. + /// + /// As with `get_word_pos`, we use a 68-bit number. Since the generator + /// simply cycles at the end of its period (1 ZiB), we ignore the upper + /// 60 bits. + </span><span class="attribute">#[inline] + </span><span class="kw">pub fn </span>set_word_pos(<span class="kw-2">&mut </span><span class="self">self</span>, word_offset: u128) { + <span class="kw">let </span>block = (word_offset / u128::from(BLOCK_WORDS)) <span class="kw">as </span>u64; + <span class="self">self</span>.rng + .core + .state + .set_block_pos(block); + <span class="self">self</span>.rng.generate_and_set((word_offset % u128::from(BLOCK_WORDS)) <span class="kw">as </span>usize); + } + + <span class="doccomment">/// Set the stream number. + /// + /// This is initialized to zero; 2<sup>64</sup> unique streams of output + /// are available per seed/key. + /// + /// Note that in order to reproduce ChaCha output with a specific 64-bit + /// nonce, one can convert that nonce to a `u64` in little-endian fashion + /// and pass to this function. In theory a 96-bit nonce can be used by + /// passing the last 64-bits to this function and using the first 32-bits as + /// the most significant half of the 64-bit counter (which may be set + /// indirectly via `set_word_pos`), but this is not directly supported. + </span><span class="attribute">#[inline] + </span><span class="kw">pub fn </span>set_stream(<span class="kw-2">&mut </span><span class="self">self</span>, stream: u64) { + <span class="self">self</span>.rng + .core + .state + .set_nonce(stream); + <span class="kw">if </span><span class="self">self</span>.rng.index() != <span class="number">64 </span>{ + <span class="kw">let </span>wp = <span class="self">self</span>.get_word_pos(); + <span class="self">self</span>.set_word_pos(wp); + } + } + + <span class="doccomment">/// Get the stream number. + </span><span class="attribute">#[inline] + </span><span class="kw">pub fn </span>get_stream(<span class="kw-2">&</span><span class="self">self</span>) -> u64 { + <span class="self">self</span>.rng + .core + .state + .get_nonce() + } + + <span class="doccomment">/// Get the seed. + </span><span class="attribute">#[inline] + </span><span class="kw">pub fn </span>get_seed(<span class="kw-2">&</span><span class="self">self</span>) -> [u8; <span class="number">32</span>] { + <span class="self">self</span>.rng + .core + .state + .get_seed() + } + } + + <span class="kw">impl </span>CryptoRng <span class="kw">for </span><span class="macro-nonterminal">$ChaChaXRng </span>{} + + <span class="kw">impl </span>From<<span class="macro-nonterminal">$ChaChaXCore</span>> <span class="kw">for </span><span class="macro-nonterminal">$ChaChaXRng </span>{ + <span class="kw">fn </span>from(core: <span class="macro-nonterminal">$ChaChaXCore</span>) -> <span class="self">Self </span>{ + <span class="macro-nonterminal">$ChaChaXRng </span>{ + rng: BlockRng::new(core), + } + } + } + + <span class="kw">impl </span>PartialEq<<span class="macro-nonterminal">$ChaChaXRng</span>> <span class="kw">for </span><span class="macro-nonterminal">$ChaChaXRng </span>{ + <span class="kw">fn </span>eq(<span class="kw-2">&</span><span class="self">self</span>, rhs: <span class="kw-2">&</span><span class="macro-nonterminal">$ChaChaXRng</span>) -> bool { + <span class="kw">let </span>a: <span class="macro-nonterminal">$abst</span>::<span class="macro-nonterminal">$ChaChaXRng </span>= <span class="self">self</span>.into(); + <span class="kw">let </span>b: <span class="macro-nonterminal">$abst</span>::<span class="macro-nonterminal">$ChaChaXRng </span>= rhs.into(); + a == b + } + } + <span class="kw">impl </span>Eq <span class="kw">for </span><span class="macro-nonterminal">$ChaChaXRng </span>{} + + <span class="attribute">#[cfg(feature = <span class="string">"serde1"</span>)] + </span><span class="kw">impl </span>Serialize <span class="kw">for </span><span class="macro-nonterminal">$ChaChaXRng </span>{ + <span class="kw">fn </span>serialize<S>(<span class="kw-2">&</span><span class="self">self</span>, s: S) -> <span class="prelude-ty">Result</span><S::Ok, S::Error> + <span class="kw">where </span>S: Serializer { + <span class="macro-nonterminal">$abst</span>::<span class="macro-nonterminal">$ChaChaXRng::from</span>(<span class="self">self</span>).serialize(s) + } + } + <span class="attribute">#[cfg(feature = <span class="string">"serde1"</span>)] + </span><span class="kw">impl</span><<span class="lifetime">'de</span>> Deserialize<<span class="lifetime">'de</span>> <span class="kw">for </span><span class="macro-nonterminal">$ChaChaXRng </span>{ + <span class="kw">fn </span>deserialize<D>(d: D) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, D::Error> <span class="kw">where </span>D: Deserializer<<span class="lifetime">'de</span>> { + <span class="macro-nonterminal">$abst</span>::<span class="macro-nonterminal">$ChaChaXRng::deserialize</span>(d).map(|x| <span class="self">Self</span>::from(<span class="kw-2">&</span>x)) + } + } + + <span class="kw">mod </span><span class="macro-nonterminal">$abst </span>{ + <span class="attribute">#[cfg(feature = <span class="string">"serde1"</span>)] </span><span class="kw">use </span>serde::{Serialize, Deserialize}; + + <span class="comment">// The abstract state of a ChaCha stream, independent of implementation choices. The + // comparison and serialization of this object is considered a semver-covered part of + // the API. + </span><span class="attribute">#[derive(Debug, PartialEq, Eq)] + #[cfg_attr( + feature = <span class="string">"serde1"</span>, + derive(Serialize, Deserialize), + )] + </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span><span class="macro-nonterminal">$ChaChaXRng </span>{ + seed: [u8; <span class="number">32</span>], + stream: u64, + word_pos: u128, + } + + <span class="kw">impl </span>From<<span class="kw-2">&</span><span class="kw">super</span>::<span class="macro-nonterminal">$ChaChaXRng</span>> <span class="kw">for </span><span class="macro-nonterminal">$ChaChaXRng </span>{ + <span class="comment">// Forget all information about the input except what is necessary to determine the + // outputs of any sequence of pub API calls. + </span><span class="kw">fn </span>from(r: <span class="kw-2">&</span><span class="kw">super</span>::<span class="macro-nonterminal">$ChaChaXRng</span>) -> <span class="self">Self </span>{ + <span class="self">Self </span>{ + seed: r.get_seed(), + stream: r.get_stream(), + word_pos: r.get_word_pos(), + } + } + } + + <span class="kw">impl </span>From<<span class="kw-2">&</span><span class="macro-nonterminal">$ChaChaXRng</span>> <span class="kw">for super</span>::<span class="macro-nonterminal">$ChaChaXRng </span>{ + <span class="comment">// Construct one of the possible concrete RNGs realizing an abstract state. + </span><span class="kw">fn </span>from(a: <span class="kw-2">&</span><span class="macro-nonterminal">$ChaChaXRng</span>) -> <span class="self">Self </span>{ + <span class="kw">use </span>rand_core::SeedableRng; + <span class="kw">let </span><span class="kw-2">mut </span>r = <span class="self">Self</span>::from_seed(a.seed); + r.set_stream(a.stream); + r.set_word_pos(a.word_pos); + r + } + } + } + } +} + +<span class="macro">chacha_impl!</span>(ChaCha20Core, ChaCha20Rng, <span class="number">10</span>, <span class="string">"ChaCha with 20 rounds"</span>, abstract20); +<span class="macro">chacha_impl!</span>(ChaCha12Core, ChaCha12Rng, <span class="number">6</span>, <span class="string">"ChaCha with 12 rounds"</span>, abstract12); +<span class="macro">chacha_impl!</span>(ChaCha8Core, ChaCha8Rng, <span class="number">4</span>, <span class="string">"ChaCha with 8 rounds"</span>, abstract8); + +<span class="attribute">#[cfg(test)] +</span><span class="kw">mod </span>test { + <span class="kw">use </span>rand_core::{RngCore, SeedableRng}; + + <span class="attribute">#[cfg(feature = <span class="string">"serde1"</span>)] </span><span class="kw">use super</span>::{ChaCha20Rng, ChaCha12Rng, ChaCha8Rng}; + + <span class="kw">type </span>ChaChaRng = <span class="kw">super</span>::ChaCha20Rng; + + <span class="attribute">#[cfg(feature = <span class="string">"serde1"</span>)] + #[test] + </span><span class="kw">fn </span>test_chacha_serde_roundtrip() { + <span class="kw">let </span>seed = [ + <span class="number">1</span>, <span class="number">0</span>, <span class="number">52</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">1</span>, <span class="number">0</span>, <span class="number">10</span>, <span class="number">0</span>, <span class="number">22</span>, <span class="number">32</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">2</span>, <span class="number">0</span>, <span class="number">55</span>, <span class="number">49</span>, <span class="number">0</span>, <span class="number">11</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">3</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, + <span class="number">0</span>, <span class="number">2</span>, <span class="number">92</span>, + ]; + <span class="kw">let </span><span class="kw-2">mut </span>rng1 = ChaCha20Rng::from_seed(seed); + <span class="kw">let </span><span class="kw-2">mut </span>rng2 = ChaCha12Rng::from_seed(seed); + <span class="kw">let </span><span class="kw-2">mut </span>rng3 = ChaCha8Rng::from_seed(seed); + + <span class="kw">let </span>encoded1 = serde_json::to_string(<span class="kw-2">&</span>rng1).unwrap(); + <span class="kw">let </span>encoded2 = serde_json::to_string(<span class="kw-2">&</span>rng2).unwrap(); + <span class="kw">let </span>encoded3 = serde_json::to_string(<span class="kw-2">&</span>rng3).unwrap(); + + <span class="kw">let </span><span class="kw-2">mut </span>decoded1: ChaCha20Rng = serde_json::from_str(<span class="kw-2">&</span>encoded1).unwrap(); + <span class="kw">let </span><span class="kw-2">mut </span>decoded2: ChaCha12Rng = serde_json::from_str(<span class="kw-2">&</span>encoded2).unwrap(); + <span class="kw">let </span><span class="kw-2">mut </span>decoded3: ChaCha8Rng = serde_json::from_str(<span class="kw-2">&</span>encoded3).unwrap(); + + <span class="macro">assert_eq!</span>(rng1, decoded1); + <span class="macro">assert_eq!</span>(rng2, decoded2); + <span class="macro">assert_eq!</span>(rng3, decoded3); + + <span class="macro">assert_eq!</span>(rng1.next_u32(), decoded1.next_u32()); + <span class="macro">assert_eq!</span>(rng2.next_u32(), decoded2.next_u32()); + <span class="macro">assert_eq!</span>(rng3.next_u32(), decoded3.next_u32()); + } + + <span class="comment">// This test validates that: + // 1. a hard-coded serialization demonstrating the format at time of initial release can still + // be deserialized to a ChaChaRng + // 2. re-serializing the resultant object produces exactly the original string + // + // Condition 2 is stronger than necessary: an equivalent serialization (e.g. with field order + // permuted, or whitespace differences) would also be admissible, but would fail this test. + // However testing for equivalence of serialized data is difficult, and there shouldn't be any + // reason we need to violate the stronger-than-needed condition, e.g. by changing the field + // definition order. + </span><span class="attribute">#[cfg(feature = <span class="string">"serde1"</span>)] + #[test] + </span><span class="kw">fn </span>test_chacha_serde_format_stability() { + <span class="kw">let </span>j = <span class="string">r#"{"seed":[4,8,15,16,23,42,4,8,15,16,23,42,4,8,15,16,23,42,4,8,15,16,23,42,4,8,15,16,23,42,4,8],"stream":27182818284,"word_pos":314159265359}"#</span>; + <span class="kw">let </span>r: ChaChaRng = serde_json::from_str(<span class="kw-2">&</span>j).unwrap(); + <span class="kw">let </span>j1 = serde_json::to_string(<span class="kw-2">&</span>r).unwrap(); + <span class="macro">assert_eq!</span>(j, j1); + } + + <span class="attribute">#[test] + </span><span class="kw">fn </span>test_chacha_construction() { + <span class="kw">let </span>seed = [ + <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">1</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">2</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">3</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, + <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, + ]; + <span class="kw">let </span><span class="kw-2">mut </span>rng1 = ChaChaRng::from_seed(seed); + <span class="macro">assert_eq!</span>(rng1.next_u32(), <span class="number">137206642</span>); + + <span class="kw">let </span><span class="kw-2">mut </span>rng2 = ChaChaRng::from_rng(rng1).unwrap(); + <span class="macro">assert_eq!</span>(rng2.next_u32(), <span class="number">1325750369</span>); + } + + <span class="attribute">#[test] + </span><span class="kw">fn </span>test_chacha_true_values_a() { + <span class="comment">// Test vectors 1 and 2 from + // https://tools.ietf.org/html/draft-nir-cfrg-chacha20-poly1305-04 + </span><span class="kw">let </span>seed = [<span class="number">0u8</span>; <span class="number">32</span>]; + <span class="kw">let </span><span class="kw-2">mut </span>rng = ChaChaRng::from_seed(seed); + + <span class="kw">let </span><span class="kw-2">mut </span>results = [<span class="number">0u32</span>; <span class="number">16</span>]; + <span class="kw">for </span>i <span class="kw">in </span>results.iter_mut() { + <span class="kw-2">*</span>i = rng.next_u32(); + } + <span class="kw">let </span>expected = [ + <span class="number">0xade0b876</span>, <span class="number">0x903df1a0</span>, <span class="number">0xe56a5d40</span>, <span class="number">0x28bd8653</span>, <span class="number">0xb819d2bd</span>, <span class="number">0x1aed8da0</span>, <span class="number">0xccef36a8</span>, + <span class="number">0xc70d778b</span>, <span class="number">0x7c5941da</span>, <span class="number">0x8d485751</span>, <span class="number">0x3fe02477</span>, <span class="number">0x374ad8b8</span>, <span class="number">0xf4b8436a</span>, <span class="number">0x1ca11815</span>, + <span class="number">0x69b687c3</span>, <span class="number">0x8665eeb2</span>, + ]; + <span class="macro">assert_eq!</span>(results, expected); + + <span class="kw">for </span>i <span class="kw">in </span>results.iter_mut() { + <span class="kw-2">*</span>i = rng.next_u32(); + } + <span class="kw">let </span>expected = [ + <span class="number">0xbee7079f</span>, <span class="number">0x7a385155</span>, <span class="number">0x7c97ba98</span>, <span class="number">0x0d082d73</span>, <span class="number">0xa0290fcb</span>, <span class="number">0x6965e348</span>, <span class="number">0x3e53c612</span>, + <span class="number">0xed7aee32</span>, <span class="number">0x7621b729</span>, <span class="number">0x434ee69c</span>, <span class="number">0xb03371d5</span>, <span class="number">0xd539d874</span>, <span class="number">0x281fed31</span>, <span class="number">0x45fb0a51</span>, + <span class="number">0x1f0ae1ac</span>, <span class="number">0x6f4d794b</span>, + ]; + <span class="macro">assert_eq!</span>(results, expected); + } + + <span class="attribute">#[test] + </span><span class="kw">fn </span>test_chacha_true_values_b() { + <span class="comment">// Test vector 3 from + // https://tools.ietf.org/html/draft-nir-cfrg-chacha20-poly1305-04 + </span><span class="kw">let </span>seed = [ + <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, + <span class="number">0</span>, <span class="number">0</span>, <span class="number">1</span>, + ]; + <span class="kw">let </span><span class="kw-2">mut </span>rng = ChaChaRng::from_seed(seed); + + <span class="comment">// Skip block 0 + </span><span class="kw">for _ in </span><span class="number">0</span>..<span class="number">16 </span>{ + rng.next_u32(); + } + + <span class="kw">let </span><span class="kw-2">mut </span>results = [<span class="number">0u32</span>; <span class="number">16</span>]; + <span class="kw">for </span>i <span class="kw">in </span>results.iter_mut() { + <span class="kw-2">*</span>i = rng.next_u32(); + } + <span class="kw">let </span>expected = [ + <span class="number">0x2452eb3a</span>, <span class="number">0x9249f8ec</span>, <span class="number">0x8d829d9b</span>, <span class="number">0xddd4ceb1</span>, <span class="number">0xe8252083</span>, <span class="number">0x60818b01</span>, <span class="number">0xf38422b8</span>, + <span class="number">0x5aaa49c9</span>, <span class="number">0xbb00ca8e</span>, <span class="number">0xda3ba7b4</span>, <span class="number">0xc4b592d1</span>, <span class="number">0xfdf2732f</span>, <span class="number">0x4436274e</span>, <span class="number">0x2561b3c8</span>, + <span class="number">0xebdd4aa6</span>, <span class="number">0xa0136c00</span>, + ]; + <span class="macro">assert_eq!</span>(results, expected); + } + + <span class="attribute">#[test] + </span><span class="kw">fn </span>test_chacha_true_values_c() { + <span class="comment">// Test vector 4 from + // https://tools.ietf.org/html/draft-nir-cfrg-chacha20-poly1305-04 + </span><span class="kw">let </span>seed = [ + <span class="number">0</span>, <span class="number">0xff</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, + <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, + ]; + <span class="kw">let </span>expected = [ + <span class="number">0xfb4dd572</span>, <span class="number">0x4bc42ef1</span>, <span class="number">0xdf922636</span>, <span class="number">0x327f1394</span>, <span class="number">0xa78dea8f</span>, <span class="number">0x5e269039</span>, <span class="number">0xa1bebbc1</span>, + <span class="number">0xcaf09aae</span>, <span class="number">0xa25ab213</span>, <span class="number">0x48a6b46c</span>, <span class="number">0x1b9d9bcb</span>, <span class="number">0x092c5be6</span>, <span class="number">0x546ca624</span>, <span class="number">0x1bec45d5</span>, + <span class="number">0x87f47473</span>, <span class="number">0x96f0992e</span>, + ]; + <span class="kw">let </span>expected_end = <span class="number">3 </span>* <span class="number">16</span>; + <span class="kw">let </span><span class="kw-2">mut </span>results = [<span class="number">0u32</span>; <span class="number">16</span>]; + + <span class="comment">// Test block 2 by skipping block 0 and 1 + </span><span class="kw">let </span><span class="kw-2">mut </span>rng1 = ChaChaRng::from_seed(seed); + <span class="kw">for _ in </span><span class="number">0</span>..<span class="number">32 </span>{ + rng1.next_u32(); + } + <span class="kw">for </span>i <span class="kw">in </span>results.iter_mut() { + <span class="kw-2">*</span>i = rng1.next_u32(); + } + <span class="macro">assert_eq!</span>(results, expected); + <span class="macro">assert_eq!</span>(rng1.get_word_pos(), expected_end); + + <span class="comment">// Test block 2 by using `set_word_pos` + </span><span class="kw">let </span><span class="kw-2">mut </span>rng2 = ChaChaRng::from_seed(seed); + rng2.set_word_pos(<span class="number">2 </span>* <span class="number">16</span>); + <span class="kw">for </span>i <span class="kw">in </span>results.iter_mut() { + <span class="kw-2">*</span>i = rng2.next_u32(); + } + <span class="macro">assert_eq!</span>(results, expected); + <span class="macro">assert_eq!</span>(rng2.get_word_pos(), expected_end); + + <span class="comment">// Test skipping behaviour with other types + </span><span class="kw">let </span><span class="kw-2">mut </span>buf = [<span class="number">0u8</span>; <span class="number">32</span>]; + rng2.fill_bytes(<span class="kw-2">&mut </span>buf[..]); + <span class="macro">assert_eq!</span>(rng2.get_word_pos(), expected_end + <span class="number">8</span>); + rng2.fill_bytes(<span class="kw-2">&mut </span>buf[<span class="number">0</span>..<span class="number">25</span>]); + <span class="macro">assert_eq!</span>(rng2.get_word_pos(), expected_end + <span class="number">15</span>); + rng2.next_u64(); + <span class="macro">assert_eq!</span>(rng2.get_word_pos(), expected_end + <span class="number">17</span>); + rng2.next_u32(); + rng2.next_u64(); + <span class="macro">assert_eq!</span>(rng2.get_word_pos(), expected_end + <span class="number">20</span>); + rng2.fill_bytes(<span class="kw-2">&mut </span>buf[<span class="number">0</span>..<span class="number">1</span>]); + <span class="macro">assert_eq!</span>(rng2.get_word_pos(), expected_end + <span class="number">21</span>); + } + + <span class="attribute">#[test] + </span><span class="kw">fn </span>test_chacha_multiple_blocks() { + <span class="kw">let </span>seed = [ + <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">1</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">2</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">3</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">4</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">5</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">6</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">7</span>, + <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, + ]; + <span class="kw">let </span><span class="kw-2">mut </span>rng = ChaChaRng::from_seed(seed); + + <span class="comment">// Store the 17*i-th 32-bit word, + // i.e., the i-th word of the i-th 16-word block + </span><span class="kw">let </span><span class="kw-2">mut </span>results = [<span class="number">0u32</span>; <span class="number">16</span>]; + <span class="kw">for </span>i <span class="kw">in </span>results.iter_mut() { + <span class="kw-2">*</span>i = rng.next_u32(); + <span class="kw">for _ in </span><span class="number">0</span>..<span class="number">16 </span>{ + rng.next_u32(); + } + } + <span class="kw">let </span>expected = [ + <span class="number">0xf225c81a</span>, <span class="number">0x6ab1be57</span>, <span class="number">0x04d42951</span>, <span class="number">0x70858036</span>, <span class="number">0x49884684</span>, <span class="number">0x64efec72</span>, <span class="number">0x4be2d186</span>, + <span class="number">0x3615b384</span>, <span class="number">0x11cfa18e</span>, <span class="number">0xd3c50049</span>, <span class="number">0x75c775f6</span>, <span class="number">0x434c6530</span>, <span class="number">0x2c5bad8f</span>, <span class="number">0x898881dc</span>, + <span class="number">0x5f1c86d9</span>, <span class="number">0xc1f8e7f4</span>, + ]; + <span class="macro">assert_eq!</span>(results, expected); + } + + <span class="attribute">#[test] + </span><span class="kw">fn </span>test_chacha_true_bytes() { + <span class="kw">let </span>seed = [<span class="number">0u8</span>; <span class="number">32</span>]; + <span class="kw">let </span><span class="kw-2">mut </span>rng = ChaChaRng::from_seed(seed); + <span class="kw">let </span><span class="kw-2">mut </span>results = [<span class="number">0u8</span>; <span class="number">32</span>]; + rng.fill_bytes(<span class="kw-2">&mut </span>results); + <span class="kw">let </span>expected = [ + <span class="number">118</span>, <span class="number">184</span>, <span class="number">224</span>, <span class="number">173</span>, <span class="number">160</span>, <span class="number">241</span>, <span class="number">61</span>, <span class="number">144</span>, <span class="number">64</span>, <span class="number">93</span>, <span class="number">106</span>, <span class="number">229</span>, <span class="number">83</span>, <span class="number">134</span>, <span class="number">189</span>, <span class="number">40</span>, <span class="number">189</span>, <span class="number">210</span>, + <span class="number">25</span>, <span class="number">184</span>, <span class="number">160</span>, <span class="number">141</span>, <span class="number">237</span>, <span class="number">26</span>, <span class="number">168</span>, <span class="number">54</span>, <span class="number">239</span>, <span class="number">204</span>, <span class="number">139</span>, <span class="number">119</span>, <span class="number">13</span>, <span class="number">199</span>, + ]; + <span class="macro">assert_eq!</span>(results, expected); + } + + <span class="attribute">#[test] + </span><span class="kw">fn </span>test_chacha_nonce() { + <span class="comment">// Test vector 5 from + // https://tools.ietf.org/html/draft-nir-cfrg-chacha20-poly1305-04 + // Although we do not support setting a nonce, we try it here anyway so + // we can use this test vector. + </span><span class="kw">let </span>seed = [<span class="number">0u8</span>; <span class="number">32</span>]; + <span class="kw">let </span><span class="kw-2">mut </span>rng = ChaChaRng::from_seed(seed); + <span class="comment">// 96-bit nonce in LE order is: 0,0,0,0, 0,0,0,0, 0,0,0,2 + </span>rng.set_stream(<span class="number">2u64 </span><< (<span class="number">24 </span>+ <span class="number">32</span>)); + + <span class="kw">let </span><span class="kw-2">mut </span>results = [<span class="number">0u32</span>; <span class="number">16</span>]; + <span class="kw">for </span>i <span class="kw">in </span>results.iter_mut() { + <span class="kw-2">*</span>i = rng.next_u32(); + } + <span class="kw">let </span>expected = [ + <span class="number">0x374dc6c2</span>, <span class="number">0x3736d58c</span>, <span class="number">0xb904e24a</span>, <span class="number">0xcd3f93ef</span>, <span class="number">0x88228b1a</span>, <span class="number">0x96a4dfb3</span>, <span class="number">0x5b76ab72</span>, + <span class="number">0xc727ee54</span>, <span class="number">0x0e0e978a</span>, <span class="number">0xf3145c95</span>, <span class="number">0x1b748ea8</span>, <span class="number">0xf786c297</span>, <span class="number">0x99c28f5f</span>, <span class="number">0x628314e8</span>, + <span class="number">0x398a19fa</span>, <span class="number">0x6ded1b53</span>, + ]; + <span class="macro">assert_eq!</span>(results, expected); + } + + <span class="attribute">#[test] + </span><span class="kw">fn </span>test_chacha_clone_streams() { + <span class="kw">let </span>seed = [ + <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">1</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">2</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">3</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">4</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">5</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">6</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">7</span>, + <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, + ]; + <span class="kw">let </span><span class="kw-2">mut </span>rng = ChaChaRng::from_seed(seed); + <span class="kw">let </span><span class="kw-2">mut </span>clone = rng.clone(); + <span class="kw">for _ in </span><span class="number">0</span>..<span class="number">16 </span>{ + <span class="macro">assert_eq!</span>(rng.next_u64(), clone.next_u64()); + } + + rng.set_stream(<span class="number">51</span>); + <span class="kw">for _ in </span><span class="number">0</span>..<span class="number">7 </span>{ + <span class="macro">assert!</span>(rng.next_u32() != clone.next_u32()); + } + clone.set_stream(<span class="number">51</span>); <span class="comment">// switch part way through block + </span><span class="kw">for _ in </span><span class="number">7</span>..<span class="number">16 </span>{ + <span class="macro">assert_eq!</span>(rng.next_u32(), clone.next_u32()); + } + } + + <span class="attribute">#[test] + </span><span class="kw">fn </span>test_chacha_word_pos_wrap_exact() { + <span class="kw">use super</span>::{BUF_BLOCKS, BLOCK_WORDS}; + <span class="kw">let </span><span class="kw-2">mut </span>rng = ChaChaRng::from_seed(Default::default()); + <span class="comment">// refilling the buffer in set_word_pos will wrap the block counter to 0 + </span><span class="kw">let </span>last_block = (<span class="number">1 </span><< <span class="number">68</span>) - u128::from(BUF_BLOCKS * BLOCK_WORDS); + rng.set_word_pos(last_block); + <span class="macro">assert_eq!</span>(rng.get_word_pos(), last_block); + } + + <span class="attribute">#[test] + </span><span class="kw">fn </span>test_chacha_word_pos_wrap_excess() { + <span class="kw">use </span><span class="kw">super</span>::BLOCK_WORDS; + <span class="kw">let </span><span class="kw-2">mut </span>rng = ChaChaRng::from_seed(Default::default()); + <span class="comment">// refilling the buffer in set_word_pos will wrap the block counter past 0 + </span><span class="kw">let </span>last_block = (<span class="number">1 </span><< <span class="number">68</span>) - u128::from(BLOCK_WORDS); + rng.set_word_pos(last_block); + <span class="macro">assert_eq!</span>(rng.get_word_pos(), last_block); + } + + <span class="attribute">#[test] + </span><span class="kw">fn </span>test_chacha_word_pos_zero() { + <span class="kw">let </span><span class="kw-2">mut </span>rng = ChaChaRng::from_seed(Default::default()); + <span class="macro">assert_eq!</span>(rng.get_word_pos(), <span class="number">0</span>); + rng.set_word_pos(<span class="number">0</span>); + <span class="macro">assert_eq!</span>(rng.get_word_pos(), <span class="number">0</span>); + } +} +</code></pre></div> +</section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="rand_chacha" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0 (69f9c33d7 2022-12-12) (Arch Linux rust 1:1.66.0-1)" ></div></body></html>
\ No newline at end of file diff --git a/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/rand_chacha/guts.rs.html b/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/rand_chacha/guts.rs.html new file mode 100644 index 0000000..dd1feff --- /dev/null +++ b/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/rand_chacha/guts.rs.html @@ -0,0 +1,549 @@ +<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/home/pico/.local/share/cargo/registry/src/github.com-1ecc6299db9ec823/rand_chacha-0.3.1/src/guts.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>guts.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin 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class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> +<span id="2">2</span> +<span id="3">3</span> +<span id="4">4</span> +<span id="5">5</span> +<span id="6">6</span> +<span id="7">7</span> +<span id="8">8</span> +<span id="9">9</span> +<span id="10">10</span> +<span id="11">11</span> +<span id="12">12</span> +<span id="13">13</span> +<span id="14">14</span> +<span id="15">15</span> +<span id="16">16</span> +<span id="17">17</span> +<span id="18">18</span> +<span id="19">19</span> +<span id="20">20</span> +<span id="21">21</span> +<span id="22">22</span> +<span id="23">23</span> +<span id="24">24</span> +<span id="25">25</span> +<span id="26">26</span> +<span id="27">27</span> +<span id="28">28</span> +<span id="29">29</span> +<span id="30">30</span> +<span id="31">31</span> +<span id="32">32</span> +<span id="33">33</span> +<span id="34">34</span> +<span id="35">35</span> +<span id="36">36</span> +<span id="37">37</span> +<span 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id="264">264</span> +<span id="265">265</span> +<span id="266">266</span> +<span id="267">267</span> +<span id="268">268</span> +<span id="269">269</span> +<span id="270">270</span> +<span id="271">271</span> +<span id="272">272</span> +<span id="273">273</span> +</pre><pre class="rust"><code><span class="comment">// Copyright 2019 The CryptoCorrosion Contributors +// Copyright 2020 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. + +</span><span class="doccomment">//! The ChaCha random number generator. + +</span><span class="kw">use </span>ppv_lite86::{dispatch, dispatch_light128}; + +<span class="kw">pub use </span>ppv_lite86::Machine; +<span class="kw">use </span>ppv_lite86::{vec128_storage, ArithOps, BitOps32, LaneWords4, MultiLane, StoreBytes, Vec4}; + +<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const </span>BLOCK: usize = <span class="number">64</span>; +<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const </span>BLOCK64: u64 = BLOCK <span class="kw">as </span>u64; +<span class="kw">const </span>LOG2_BUFBLOCKS: u64 = <span class="number">2</span>; +<span class="kw">const </span>BUFBLOCKS: u64 = <span class="number">1 </span><< LOG2_BUFBLOCKS; +<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const </span>BUFSZ64: u64 = BLOCK64 * BUFBLOCKS; +<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const </span>BUFSZ: usize = BUFSZ64 <span class="kw">as </span>usize; + +<span class="kw">const </span>STREAM_PARAM_NONCE: u32 = <span class="number">1</span>; +<span class="kw">const </span>STREAM_PARAM_BLOCK: u32 = <span class="number">0</span>; + +<span class="attribute">#[derive(Clone, PartialEq, Eq)] +</span><span class="kw">pub struct </span>ChaCha { + <span class="kw">pub</span>(<span class="kw">crate</span>) b: vec128_storage, + <span class="kw">pub</span>(<span class="kw">crate</span>) c: vec128_storage, + <span class="kw">pub</span>(<span class="kw">crate</span>) d: vec128_storage, +} + +<span class="attribute">#[derive(Clone)] +</span><span class="kw">pub struct </span>State<V> { + <span class="kw">pub</span>(<span class="kw">crate</span>) a: V, + <span class="kw">pub</span>(<span class="kw">crate</span>) b: V, + <span class="kw">pub</span>(<span class="kw">crate</span>) c: V, + <span class="kw">pub</span>(<span class="kw">crate</span>) d: V, +} + +<span class="attribute">#[inline(always)] +</span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>round<V: ArithOps + BitOps32>(<span class="kw-2">mut </span>x: State<V>) -> State<V> { + x.a += x.b; + x.d = (x.d ^ x.a).rotate_each_word_right16(); + x.c += x.d; + x.b = (x.b ^ x.c).rotate_each_word_right20(); + x.a += x.b; + x.d = (x.d ^ x.a).rotate_each_word_right24(); + x.c += x.d; + x.b = (x.b ^ x.c).rotate_each_word_right25(); + x +} + +<span class="attribute">#[inline(always)] +</span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>diagonalize<V: LaneWords4>(<span class="kw-2">mut </span>x: State<V>) -> State<V> { + x.b = x.b.shuffle_lane_words3012(); + x.c = x.c.shuffle_lane_words2301(); + x.d = x.d.shuffle_lane_words1230(); + x +} +<span class="attribute">#[inline(always)] +</span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>undiagonalize<V: LaneWords4>(<span class="kw-2">mut </span>x: State<V>) -> State<V> { + x.b = x.b.shuffle_lane_words1230(); + x.c = x.c.shuffle_lane_words2301(); + x.d = x.d.shuffle_lane_words3012(); + x +} + +<span class="kw">impl </span>ChaCha { + <span class="attribute">#[inline(always)] + </span><span class="kw">pub fn </span>new(key: <span class="kw-2">&</span>[u8; <span class="number">32</span>], nonce: <span class="kw-2">&</span>[u8]) -> <span class="self">Self </span>{ + init_chacha(key, nonce) + } + + <span class="attribute">#[inline(always)] + </span><span class="kw">fn </span>pos64<M: Machine>(<span class="kw-2">&</span><span class="self">self</span>, m: M) -> u64 { + <span class="kw">let </span>d: M::u32x4 = m.unpack(<span class="self">self</span>.d); + ((d.extract(<span class="number">1</span>) <span class="kw">as </span>u64) << <span class="number">32</span>) | d.extract(<span class="number">0</span>) <span class="kw">as </span>u64 + } + + <span class="doccomment">/// Produce 4 blocks of output, advancing the state + </span><span class="attribute">#[inline(always)] + </span><span class="kw">pub fn </span>refill4(<span class="kw-2">&mut </span><span class="self">self</span>, drounds: u32, out: <span class="kw-2">&mut </span>[u8; BUFSZ]) { + refill_wide(<span class="self">self</span>, drounds, out) + } + + <span class="attribute">#[inline(always)] + </span><span class="kw">pub fn </span>set_block_pos(<span class="kw-2">&mut </span><span class="self">self</span>, value: u64) { + set_stream_param(<span class="self">self</span>, STREAM_PARAM_BLOCK, value) + } + + <span class="attribute">#[inline(always)] + </span><span class="kw">pub fn </span>get_block_pos(<span class="kw-2">&</span><span class="self">self</span>) -> u64 { + get_stream_param(<span class="self">self</span>, STREAM_PARAM_BLOCK) + } + + <span class="attribute">#[inline(always)] + </span><span class="kw">pub fn </span>set_nonce(<span class="kw-2">&mut </span><span class="self">self</span>, value: u64) { + set_stream_param(<span class="self">self</span>, STREAM_PARAM_NONCE, value) + } + + <span class="attribute">#[inline(always)] + </span><span class="kw">pub fn </span>get_nonce(<span class="kw-2">&</span><span class="self">self</span>) -> u64 { + get_stream_param(<span class="self">self</span>, STREAM_PARAM_NONCE) + } + + <span class="attribute">#[inline(always)] + </span><span class="kw">pub fn </span>get_seed(<span class="kw-2">&</span><span class="self">self</span>) -> [u8; <span class="number">32</span>] { + get_seed(<span class="self">self</span>) + } +} + +<span class="attribute">#[allow(clippy::many_single_char_names)] +#[inline(always)] +</span><span class="kw">fn </span>refill_wide_impl<Mach: Machine>( + m: Mach, state: <span class="kw-2">&mut </span>ChaCha, drounds: u32, out: <span class="kw-2">&mut </span>[u8; BUFSZ], +) { + <span class="kw">let </span>k = m.vec([<span class="number">0x6170_7865</span>, <span class="number">0x3320_646e</span>, <span class="number">0x7962_2d32</span>, <span class="number">0x6b20_6574</span>]); + <span class="kw">let </span><span class="kw-2">mut </span>pos = state.pos64(m); + <span class="kw">let </span>d0: Mach::u32x4 = m.unpack(state.d); + pos = pos.wrapping_add(<span class="number">1</span>); + <span class="kw">let </span>d1 = d0.insert((pos >> <span class="number">32</span>) <span class="kw">as </span>u32, <span class="number">1</span>).insert(pos <span class="kw">as </span>u32, <span class="number">0</span>); + pos = pos.wrapping_add(<span class="number">1</span>); + <span class="kw">let </span>d2 = d0.insert((pos >> <span class="number">32</span>) <span class="kw">as </span>u32, <span class="number">1</span>).insert(pos <span class="kw">as </span>u32, <span class="number">0</span>); + pos = pos.wrapping_add(<span class="number">1</span>); + <span class="kw">let </span>d3 = d0.insert((pos >> <span class="number">32</span>) <span class="kw">as </span>u32, <span class="number">1</span>).insert(pos <span class="kw">as </span>u32, <span class="number">0</span>); + + <span class="kw">let </span>b = m.unpack(state.b); + <span class="kw">let </span>c = m.unpack(state.c); + <span class="kw">let </span><span class="kw-2">mut </span>x = State { + a: Mach::u32x4x4::from_lanes([k, k, k, k]), + b: Mach::u32x4x4::from_lanes([b, b, b, b]), + c: Mach::u32x4x4::from_lanes([c, c, c, c]), + d: m.unpack(Mach::u32x4x4::from_lanes([d0, d1, d2, d3]).into()), + }; + <span class="kw">for _ in </span><span class="number">0</span>..drounds { + x = round(x); + x = undiagonalize(round(diagonalize(x))); + } + <span class="kw">let </span><span class="kw-2">mut </span>pos = state.pos64(m); + <span class="kw">let </span>d0: Mach::u32x4 = m.unpack(state.d); + pos = pos.wrapping_add(<span class="number">1</span>); + <span class="kw">let </span>d1 = d0.insert((pos >> <span class="number">32</span>) <span class="kw">as </span>u32, <span class="number">1</span>).insert(pos <span class="kw">as </span>u32, <span class="number">0</span>); + pos = pos.wrapping_add(<span class="number">1</span>); + <span class="kw">let </span>d2 = d0.insert((pos >> <span class="number">32</span>) <span class="kw">as </span>u32, <span class="number">1</span>).insert(pos <span class="kw">as </span>u32, <span class="number">0</span>); + pos = pos.wrapping_add(<span class="number">1</span>); + <span class="kw">let </span>d3 = d0.insert((pos >> <span class="number">32</span>) <span class="kw">as </span>u32, <span class="number">1</span>).insert(pos <span class="kw">as </span>u32, <span class="number">0</span>); + pos = pos.wrapping_add(<span class="number">1</span>); + <span class="kw">let </span>d4 = d0.insert((pos >> <span class="number">32</span>) <span class="kw">as </span>u32, <span class="number">1</span>).insert(pos <span class="kw">as </span>u32, <span class="number">0</span>); + + <span class="kw">let </span>(a, b, c, d) = ( + x.a.to_lanes(), + x.b.to_lanes(), + x.c.to_lanes(), + x.d.to_lanes(), + ); + <span class="kw">let </span>sb = m.unpack(state.b); + <span class="kw">let </span>sc = m.unpack(state.c); + <span class="kw">let </span>sd = [m.unpack(state.d), d1, d2, d3]; + state.d = d4.into(); + <span class="kw">let </span><span class="kw-2">mut </span>words = out.chunks_exact_mut(<span class="number">16</span>); + <span class="kw">for </span>((((<span class="kw-2">&</span>a, <span class="kw-2">&</span>b), <span class="kw-2">&</span>c), <span class="kw-2">&</span>d), <span class="kw-2">&</span>sd) <span class="kw">in </span>a.iter().zip(<span class="kw-2">&</span>b).zip(<span class="kw-2">&</span>c).zip(<span class="kw-2">&</span>d).zip(<span class="kw-2">&</span>sd) { + (a + k).write_le(words.next().unwrap()); + (b + sb).write_le(words.next().unwrap()); + (c + sc).write_le(words.next().unwrap()); + (d + sd).write_le(words.next().unwrap()); + } +} + +<span class="macro">dispatch!</span>(m, Mach, { + <span class="kw">fn </span>refill_wide(state: <span class="kw-2">&mut </span>ChaCha, drounds: u32, out: <span class="kw-2">&mut </span>[u8; BUFSZ]) { + refill_wide_impl(m, state, drounds, out); + } +}); + +<span class="comment">// Single-block, rounds-only; shared by try_apply_keystream for tails shorter than BUFSZ +// and XChaCha's setup step. +</span><span class="macro">dispatch!</span>(m, Mach, { + <span class="kw">fn </span>refill_narrow_rounds(state: <span class="kw-2">&mut </span>ChaCha, drounds: u32) -> State<vec128_storage> { + <span class="kw">let </span>k: Mach::u32x4 = m.vec([<span class="number">0x6170_7865</span>, <span class="number">0x3320_646e</span>, <span class="number">0x7962_2d32</span>, <span class="number">0x6b20_6574</span>]); + <span class="kw">let </span><span class="kw-2">mut </span>x = State { + a: k, + b: m.unpack(state.b), + c: m.unpack(state.c), + d: m.unpack(state.d), + }; + <span class="kw">for _ in </span><span class="number">0</span>..drounds { + x = round(x); + x = undiagonalize(round(diagonalize(x))); + } + State { + a: x.a.into(), + b: x.b.into(), + c: x.c.into(), + d: x.d.into(), + } + } +}); + +<span class="macro">dispatch_light128!</span>(m, Mach, { + <span class="kw">fn </span>set_stream_param(state: <span class="kw-2">&mut </span>ChaCha, param: u32, value: u64) { + <span class="kw">let </span>d: Mach::u32x4 = m.unpack(state.d); + state.d = d + .insert((value >> <span class="number">32</span>) <span class="kw">as </span>u32, (param << <span class="number">1</span>) | <span class="number">1</span>) + .insert(value <span class="kw">as </span>u32, param << <span class="number">1</span>) + .into(); + } +}); + +<span class="macro">dispatch_light128!</span>(m, Mach, { + <span class="kw">fn </span>get_stream_param(state: <span class="kw-2">&</span>ChaCha, param: u32) -> u64 { + <span class="kw">let </span>d: Mach::u32x4 = m.unpack(state.d); + ((d.extract((param << <span class="number">1</span>) | <span class="number">1</span>) <span class="kw">as </span>u64) << <span class="number">32</span>) | d.extract(param << <span class="number">1</span>) <span class="kw">as </span>u64 + } +}); + +<span class="macro">dispatch_light128!</span>(m, Mach, { + <span class="kw">fn </span>get_seed(state: <span class="kw-2">&</span>ChaCha) -> [u8; <span class="number">32</span>] { + <span class="kw">let </span>b: Mach::u32x4 = m.unpack(state.b); + <span class="kw">let </span>c: Mach::u32x4 = m.unpack(state.c); + <span class="kw">let </span><span class="kw-2">mut </span>key = [<span class="number">0u8</span>; <span class="number">32</span>]; + b.write_le(<span class="kw-2">&mut </span>key[..<span class="number">16</span>]); + c.write_le(<span class="kw-2">&mut </span>key[<span class="number">16</span>..]); + key + } +}); + +<span class="kw">fn </span>read_u32le(xs: <span class="kw-2">&</span>[u8]) -> u32 { + <span class="macro">assert_eq!</span>(xs.len(), <span class="number">4</span>); + u32::from(xs[<span class="number">0</span>]) | (u32::from(xs[<span class="number">1</span>]) << <span class="number">8</span>) | (u32::from(xs[<span class="number">2</span>]) << <span class="number">16</span>) | (u32::from(xs[<span class="number">3</span>]) << <span class="number">24</span>) +} + +<span class="macro">dispatch_light128!</span>(m, Mach, { + <span class="kw">fn </span>init_chacha(key: <span class="kw-2">&</span>[u8; <span class="number">32</span>], nonce: <span class="kw-2">&</span>[u8]) -> ChaCha { + <span class="kw">let </span>ctr_nonce = [ + <span class="number">0</span>, + <span class="kw">if </span>nonce.len() == <span class="number">12 </span>{ + read_u32le(<span class="kw-2">&</span>nonce[<span class="number">0</span>..<span class="number">4</span>]) + } <span class="kw">else </span>{ + <span class="number">0 + </span>}, + read_u32le(<span class="kw-2">&</span>nonce[nonce.len() - <span class="number">8</span>..nonce.len() - <span class="number">4</span>]), + read_u32le(<span class="kw-2">&</span>nonce[nonce.len() - <span class="number">4</span>..]), + ]; + <span class="kw">let </span>key0: Mach::u32x4 = m.read_le(<span class="kw-2">&</span>key[..<span class="number">16</span>]); + <span class="kw">let </span>key1: Mach::u32x4 = m.read_le(<span class="kw-2">&</span>key[<span class="number">16</span>..]); + ChaCha { + b: key0.into(), + c: key1.into(), + d: ctr_nonce.into(), + } + } +}); + +<span class="macro">dispatch_light128!</span>(m, Mach, { + <span class="kw">fn </span>init_chacha_x(key: <span class="kw-2">&</span>[u8; <span class="number">32</span>], nonce: <span class="kw-2">&</span>[u8; <span class="number">24</span>], rounds: u32) -> ChaCha { + <span class="kw">let </span>key0: Mach::u32x4 = m.read_le(<span class="kw-2">&</span>key[..<span class="number">16</span>]); + <span class="kw">let </span>key1: Mach::u32x4 = m.read_le(<span class="kw-2">&</span>key[<span class="number">16</span>..]); + <span class="kw">let </span>nonce0: Mach::u32x4 = m.read_le(<span class="kw-2">&</span>nonce[..<span class="number">16</span>]); + <span class="kw">let </span><span class="kw-2">mut </span>state = ChaCha { + b: key0.into(), + c: key1.into(), + d: nonce0.into(), + }; + <span class="kw">let </span>x = refill_narrow_rounds(<span class="kw-2">&mut </span>state, rounds); + <span class="kw">let </span>ctr_nonce1 = [<span class="number">0</span>, <span class="number">0</span>, read_u32le(<span class="kw-2">&</span>nonce[<span class="number">16</span>..<span class="number">20</span>]), read_u32le(<span class="kw-2">&</span>nonce[<span class="number">20</span>..<span class="number">24</span>])]; + state.b = x.a; + state.c = x.d; + state.d = ctr_nonce1.into(); + state + } +}); +</code></pre></div> +</section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="rand_chacha" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0 (69f9c33d7 2022-12-12) (Arch Linux rust 1:1.66.0-1)" ></div></body></html>
\ No newline at end of file diff --git a/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/rand_chacha/lib.rs.html b/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/rand_chacha/lib.rs.html new file mode 100644 index 0000000..12d8c8e --- /dev/null +++ b/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/rand_chacha/lib.rs.html @@ -0,0 +1,69 @@ +<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/home/pico/.local/share/cargo/registry/src/github.com-1ecc6299db9ec823/rand_chacha-0.3.1/src/lib.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>lib.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="icon" href="https://www.rust-lang.org/favicon.ico"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../rand_chacha/index.html"> + <img src="https://www.rust-lang.org/logos/rust-logo-128x128-blk.png" alt="logo"></a><form class="search-form"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> +<span id="2">2</span> +<span id="3">3</span> +<span id="4">4</span> +<span id="5">5</span> +<span id="6">6</span> +<span id="7">7</span> +<span id="8">8</span> +<span id="9">9</span> +<span id="10">10</span> +<span id="11">11</span> +<span id="12">12</span> +<span id="13">13</span> +<span id="14">14</span> +<span id="15">15</span> +<span id="16">16</span> +<span id="17">17</span> +<span id="18">18</span> +<span id="19">19</span> +<span id="20">20</span> +<span id="21">21</span> +<span id="22">22</span> +<span id="23">23</span> +<span id="24">24</span> +<span id="25">25</span> +<span id="26">26</span> +<span id="27">27</span> +<span id="28">28</span> +<span id="29">29</span> +<span id="30">30</span> +<span id="31">31</span> +<span id="32">32</span> +<span id="33">33</span> +</pre><pre class="rust"><code><span class="comment">// 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. + +</span><span class="doccomment">//! The ChaCha random number generator. + +</span><span class="attribute">#![doc( + html_logo_url = <span class="string">"https://www.rust-lang.org/logos/rust-logo-128x128-blk.png"</span>, + html_favicon_url = <span class="string">"https://www.rust-lang.org/favicon.ico"</span>, + html_root_url = <span class="string">"https://rust-random.github.io/rand/" +</span>)] +#![deny(missing_docs)] +#![deny(missing_debug_implementations)] +#![doc(test(attr(allow(unused_variables), deny(warnings))))] +#![cfg_attr(not(feature = <span class="string">"std"</span>), no_std)] + +</span><span class="kw">pub use </span>rand_core; + +<span class="kw">mod </span>chacha; +<span class="kw">mod </span>guts; + +<span class="kw">pub use </span><span class="kw">crate</span>::chacha::{ + ChaCha12Core, ChaCha12Rng, ChaCha20Core, ChaCha20Rng, ChaCha8Core, ChaCha8Rng, +}; + +<span class="doccomment">/// ChaCha with 20 rounds +</span><span class="kw">pub type </span>ChaChaRng = ChaCha20Rng; +<span class="doccomment">/// ChaCha with 20 rounds, low-level interface +</span><span class="kw">pub type </span>ChaChaCore = ChaCha20Core; +</code></pre></div> +</section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="rand_chacha" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0 (69f9c33d7 2022-12-12) (Arch Linux rust 1:1.66.0-1)" ></div></body></html>
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