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| <span id="635">635</span> |
| <span id="636">636</span> |
| <span id="637">637</span> |
| </pre><pre class="rust"><code><span class="comment">// Copyright 2018 Developers of the Rand project.</span> |
| <span class="comment">//</span> |
| <span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span> |
| <span class="comment">// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span> |
| <span class="comment">// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your</span> |
| <span class="comment">// option. This file may not be copied, modified, or distributed</span> |
| <span class="comment">// except according to those terms.</span> |
| |
| <span class="doccomment">//! The ChaCha random number generator.</span> |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std"</span>))]</span> <span class="kw">use</span> <span class="ident">core</span>; |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std"</span>)]</span> <span class="kw">use</span> <span class="ident">std</span> <span class="kw">as</span> <span class="ident">core</span>; |
| |
| <span class="kw">use</span> <span class="ident"><span class="self">self</span>::core::fmt</span>; |
| <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::guts::ChaCha</span>; |
| <span class="kw">use</span> <span class="ident">rand_core::block</span>::{<span class="ident">BlockRng</span>, <span class="ident">BlockRngCore</span>}; |
| <span class="kw">use</span> <span class="ident">rand_core</span>::{<span class="ident">CryptoRng</span>, <span class="ident">Error</span>, <span class="ident">RngCore</span>, <span class="ident">SeedableRng</span>}; |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"serde1"</span>)]</span> <span class="kw">use</span> <span class="ident">serde</span>::{<span class="ident">Serialize</span>, <span class="ident">Deserialize</span>, <span class="ident">Serializer</span>, <span class="ident">Deserializer</span>}; |
| |
| <span class="comment">// NB. this must remain consistent with some currently hard-coded numbers in this module</span> |
| <span class="kw">const</span> <span class="ident">BUF_BLOCKS</span>: <span class="ident">u8</span> <span class="op">=</span> <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> <span class="ident">BLOCK_WORDS</span>: <span class="ident">u8</span> <span class="op">=</span> <span class="number">16</span>; |
| |
| <span class="attribute">#[<span class="ident">repr</span>(<span class="ident">transparent</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Array64</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>([<span class="ident">T</span>; <span class="number">64</span>]); |
| <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Default</span> <span class="kw">for</span> <span class="ident">Array64</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> |
| <span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Default</span> |
| { |
| <span class="attribute">#[<span class="ident">rustfmt::skip</span>]</span> |
| <span class="kw">fn</span> <span class="ident">default</span>() -> <span class="self">Self</span> { |
| <span class="self">Self</span>([ |
| <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), |
| <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), |
| <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), |
| <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), |
| <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), |
| <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), |
| <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), |
| <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), <span class="ident">T::default</span>(), |
| ]) |
| } |
| } |
| <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">AsRef</span><span class="op"><</span>[<span class="ident">T</span>]<span class="op">></span> <span class="kw">for</span> <span class="ident">Array64</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { |
| <span class="kw">fn</span> <span class="ident">as_ref</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>[<span class="ident">T</span>] { |
| <span class="kw-2">&</span><span class="self">self</span>.<span class="number">0</span> |
| } |
| } |
| <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">AsMut</span><span class="op"><</span>[<span class="ident">T</span>]<span class="op">></span> <span class="kw">for</span> <span class="ident">Array64</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { |
| <span class="kw">fn</span> <span class="ident">as_mut</span>(<span class="kw-2">&mut</span> <span class="self">self</span>) -> <span class="kw-2">&mut</span> [<span class="ident">T</span>] { |
| <span class="kw-2">&mut</span> <span class="self">self</span>.<span class="number">0</span> |
| } |
| } |
| <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">Array64</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> |
| <span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Copy</span> <span class="op">+</span> <span class="ident">Default</span> |
| { |
| <span class="kw">fn</span> <span class="ident">clone</span>(<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> <span class="ident">new</span> <span class="op">=</span> <span class="ident"><span class="self">Self</span>::default</span>(); |
| <span class="ident">new</span>.<span class="number">0</span>.<span class="ident">copy_from_slice</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="number">0</span>); |
| <span class="ident">new</span> |
| } |
| } |
| <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">fmt::Debug</span> <span class="kw">for</span> <span class="ident">Array64</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { |
| <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&mut</span> <span class="ident">fmt::Formatter</span>) -> <span class="ident">fmt::Result</span> { |
| <span class="macro">write!</span>(<span class="ident">f</span>, <span class="string">"Array64 {{}}"</span>) |
| } |
| } |
| |
| <span class="macro">macro_rules!</span> <span class="ident">chacha_impl</span> { |
| (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">ChaChaXCore</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ChaChaXRng</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">rounds</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">doc</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">abst</span>:<span class="ident">ident</span>) => { |
| <span class="attribute">#[<span class="ident">doc</span><span class="op">=</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">doc</span>]</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">PartialEq</span>, <span class="ident">Eq</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ChaChaXCore</span> { |
| <span class="ident">state</span>: <span class="ident">ChaCha</span>, |
| } |
| |
| <span class="comment">// Custom Debug implementation that does not expose the internal state</span> |
| <span class="kw">impl</span> <span class="ident">fmt::Debug</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ChaChaXCore</span> { |
| <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&mut</span> <span class="ident">fmt::Formatter</span>) -> <span class="ident">fmt::Result</span> { |
| <span class="macro">write!</span>(<span class="ident">f</span>, <span class="string">"ChaChaXCore {{}}"</span>) |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">BlockRngCore</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ChaChaXCore</span> { |
| <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">u32</span>; |
| <span class="kw">type</span> <span class="ident">Results</span> <span class="op">=</span> <span class="ident">Array64</span><span class="op"><</span><span class="ident">u32</span><span class="op">></span>; |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">fn</span> <span class="ident">generate</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">r</span>: <span class="kw-2">&mut</span> <span class="ident"><span class="self">Self</span>::Results</span>) { |
| <span class="self">self</span>.<span class="ident">state</span>.<span class="ident">refill4</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">rounds</span>, <span class="kw-2">&mut</span> <span class="ident">r</span>.<span class="number">0</span>); |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">SeedableRng</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ChaChaXCore</span> { |
| <span class="kw">type</span> <span class="ident">Seed</span> <span class="op">=</span> [<span class="ident">u8</span>; <span class="number">32</span>]; |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">fn</span> <span class="ident">from_seed</span>(<span class="ident">seed</span>: <span class="ident"><span class="self">Self</span>::Seed</span>) -> <span class="self">Self</span> { |
| <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ChaChaXCore</span> { <span class="ident">state</span>: <span class="ident">ChaCha::new</span>(<span class="kw-2">&</span><span class="ident">seed</span>, <span class="kw-2">&</span>[<span class="number">0u8</span>; <span class="number">8</span>]) } |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">CryptoRng</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ChaChaXCore</span> {} |
| |
| <span class="doccomment">/// A cryptographically secure random number generator that uses the ChaCha algorithm.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// ChaCha is a stream cipher designed by Daniel J. Bernstein[^1], that we use as an RNG. It is</span> |
| <span class="doccomment">/// an improved variant of the Salsa20 cipher family, which was selected as one of the "stream</span> |
| <span class="doccomment">/// ciphers suitable for widespread adoption" by eSTREAM[^2].</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// ChaCha uses add-rotate-xor (ARX) operations as its basis. These are safe against timing</span> |
| <span class="doccomment">/// attacks, although that is mostly a concern for ciphers and not for RNGs. We provide a SIMD</span> |
| <span class="doccomment">/// implementation to support high throughput on a variety of common hardware platforms.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// With the ChaCha algorithm it is possible to choose the number of rounds the core algorithm</span> |
| <span class="doccomment">/// should run. The number of rounds is a tradeoff between performance and security, where 8</span> |
| <span class="doccomment">/// rounds is the minimum potentially secure configuration, and 20 rounds is widely used as a</span> |
| <span class="doccomment">/// conservative choice.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// We use a 64-bit counter and 64-bit stream identifier as in Bernstein's implementation[^1]</span> |
| <span class="doccomment">/// except that we use a stream identifier in place of a nonce. A 64-bit counter over 64-byte</span> |
| <span class="doccomment">/// (16 word) blocks allows 1 ZiB of output before cycling, and the stream identifier allows</span> |
| <span class="doccomment">/// 2<sup>64</sup> unique streams of output per seed. Both counter and stream are initialized</span> |
| <span class="doccomment">/// to zero but may be set via the `set_word_pos` and `set_stream` methods.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// The word layout is:</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// ```text</span> |
| <span class="doccomment">/// constant constant constant constant</span> |
| <span class="doccomment">/// seed seed seed seed</span> |
| <span class="doccomment">/// seed seed seed seed</span> |
| <span class="doccomment">/// counter counter stream_id stream_id</span> |
| <span class="doccomment">/// ```</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This implementation uses an output buffer of sixteen `u32` words, and uses</span> |
| <span class="doccomment">/// [`BlockRng`] to implement the [`RngCore`] methods.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// [^1]: D. J. Bernstein, [*ChaCha, a variant of Salsa20*](</span> |
| <span class="doccomment">/// https://cr.yp.to/chacha.html)</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// [^2]: [eSTREAM: the ECRYPT Stream Cipher Project](</span> |
| <span class="doccomment">/// http://www.ecrypt.eu.org/stream/)</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Debug</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ChaChaXRng</span> { |
| <span class="ident">rng</span>: <span class="ident">BlockRng</span><span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">ChaChaXCore</span><span class="op">></span>, |
| } |
| |
| <span class="kw">impl</span> <span class="ident">SeedableRng</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ChaChaXRng</span> { |
| <span class="kw">type</span> <span class="ident">Seed</span> <span class="op">=</span> [<span class="ident">u8</span>; <span class="number">32</span>]; |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">fn</span> <span class="ident">from_seed</span>(<span class="ident">seed</span>: <span class="ident"><span class="self">Self</span>::Seed</span>) -> <span class="self">Self</span> { |
| <span class="kw">let</span> <span class="ident">core</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ChaChaXCore::from_seed</span>(<span class="ident">seed</span>); |
| <span class="self">Self</span> { |
| <span class="ident">rng</span>: <span class="ident">BlockRng::new</span>(<span class="ident">core</span>), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">RngCore</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ChaChaXRng</span> { |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">fn</span> <span class="ident">next_u32</span>(<span class="kw-2">&mut</span> <span class="self">self</span>) -> <span class="ident">u32</span> { |
| <span class="self">self</span>.<span class="ident">rng</span>.<span class="ident">next_u32</span>() |
| } |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">fn</span> <span class="ident">next_u64</span>(<span class="kw-2">&mut</span> <span class="self">self</span>) -> <span class="ident">u64</span> { |
| <span class="self">self</span>.<span class="ident">rng</span>.<span class="ident">next_u64</span>() |
| } |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">fn</span> <span class="ident">fill_bytes</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">bytes</span>: <span class="kw-2">&mut</span> [<span class="ident">u8</span>]) { |
| <span class="self">self</span>.<span class="ident">rng</span>.<span class="ident">fill_bytes</span>(<span class="ident">bytes</span>) |
| } |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">fn</span> <span class="ident">try_fill_bytes</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">bytes</span>: <span class="kw-2">&mut</span> [<span class="ident">u8</span>]) -> <span class="prelude-ty">Result</span><span class="op"><</span>(), <span class="ident">Error</span><span class="op">></span> { |
| <span class="self">self</span>.<span class="ident">rng</span>.<span class="ident">try_fill_bytes</span>(<span class="ident">bytes</span>) |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="macro-nonterminal">$</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</span> |
| <span class="comment">// stream but if the stream has been sought it may not be self-aligned.</span> |
| |
| <span class="doccomment">/// Get the offset from the start of the stream, in 32-bit words.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Since the generated blocks are 16 words (2<sup>4</sup>) long and the</span> |
| <span class="doccomment">/// counter is 64-bits, the offset is a 68-bit number. Sub-word offsets are</span> |
| <span class="doccomment">/// not supported, hence the result can simply be multiplied by 4 to get a</span> |
| <span class="doccomment">/// byte-offset.</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_word_pos</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">u128</span> { |
| <span class="kw">let</span> <span class="ident">buf_start_block</span> <span class="op">=</span> { |
| <span class="kw">let</span> <span class="ident">buf_end_block</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">rng</span>.<span class="ident">core</span>.<span class="ident">state</span>.<span class="ident">get_block_pos</span>(); |
| <span class="ident">u64::wrapping_sub</span>(<span class="ident">buf_end_block</span>, <span class="ident">BUF_BLOCKS</span>.<span class="ident">into</span>()) |
| }; |
| <span class="kw">let</span> (<span class="ident">buf_offset_blocks</span>, <span class="ident">block_offset_words</span>) <span class="op">=</span> { |
| <span class="kw">let</span> <span class="ident">buf_offset_words</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">rng</span>.<span class="ident">index</span>() <span class="kw">as</span> <span class="ident">u64</span>; |
| <span class="kw">let</span> <span class="ident">blocks_part</span> <span class="op">=</span> <span class="ident">buf_offset_words</span> <span class="op">/</span> <span class="ident">u64::from</span>(<span class="ident">BLOCK_WORDS</span>); |
| <span class="kw">let</span> <span class="ident">words_part</span> <span class="op">=</span> <span class="ident">buf_offset_words</span> <span class="op">%</span> <span class="ident">u64::from</span>(<span class="ident">BLOCK_WORDS</span>); |
| (<span class="ident">blocks_part</span>, <span class="ident">words_part</span>) |
| }; |
| <span class="kw">let</span> <span class="ident">pos_block</span> <span class="op">=</span> <span class="ident">u64::wrapping_add</span>(<span class="ident">buf_start_block</span>, <span class="ident">buf_offset_blocks</span>); |
| <span class="kw">let</span> <span class="ident">pos_block_words</span> <span class="op">=</span> <span class="ident">u128::from</span>(<span class="ident">pos_block</span>) <span class="op">*</span> <span class="ident">u128::from</span>(<span class="ident">BLOCK_WORDS</span>); |
| <span class="ident">pos_block_words</span> <span class="op">+</span> <span class="ident">u128::from</span>(<span class="ident">block_offset_words</span>) |
| } |
| |
| <span class="doccomment">/// Set the offset from the start of the stream, in 32-bit words.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// As with `get_word_pos`, we use a 68-bit number. Since the generator</span> |
| <span class="doccomment">/// simply cycles at the end of its period (1 ZiB), we ignore the upper</span> |
| <span class="doccomment">/// 60 bits.</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_word_pos</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">word_offset</span>: <span class="ident">u128</span>) { |
| <span class="kw">let</span> <span class="ident">block</span> <span class="op">=</span> (<span class="ident">word_offset</span> <span class="op">/</span> <span class="ident">u128::from</span>(<span class="ident">BLOCK_WORDS</span>)) <span class="kw">as</span> <span class="ident">u64</span>; |
| <span class="self">self</span>.<span class="ident">rng</span> |
| .<span class="ident">core</span> |
| .<span class="ident">state</span> |
| .<span class="ident">set_block_pos</span>(<span class="ident">block</span>); |
| <span class="self">self</span>.<span class="ident">rng</span>.<span class="ident">generate_and_set</span>((<span class="ident">word_offset</span> <span class="op">%</span> <span class="ident">u128::from</span>(<span class="ident">BLOCK_WORDS</span>)) <span class="kw">as</span> <span class="ident">usize</span>); |
| } |
| |
| <span class="doccomment">/// Set the stream number.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This is initialized to zero; 2<sup>64</sup> unique streams of output</span> |
| <span class="doccomment">/// are available per seed/key.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Note that in order to reproduce ChaCha output with a specific 64-bit</span> |
| <span class="doccomment">/// nonce, one can convert that nonce to a `u64` in little-endian fashion</span> |
| <span class="doccomment">/// and pass to this function. In theory a 96-bit nonce can be used by</span> |
| <span class="doccomment">/// passing the last 64-bits to this function and using the first 32-bits as</span> |
| <span class="doccomment">/// the most significant half of the 64-bit counter (which may be set</span> |
| <span class="doccomment">/// indirectly via `set_word_pos`), but this is not directly supported.</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_stream</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">stream</span>: <span class="ident">u64</span>) { |
| <span class="self">self</span>.<span class="ident">rng</span> |
| .<span class="ident">core</span> |
| .<span class="ident">state</span> |
| .<span class="ident">set_nonce</span>(<span class="ident">stream</span>); |
| <span class="kw">if</span> <span class="self">self</span>.<span class="ident">rng</span>.<span class="ident">index</span>() <span class="op">!</span><span class="op">=</span> <span class="number">64</span> { |
| <span class="kw">let</span> <span class="ident">wp</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">get_word_pos</span>(); |
| <span class="self">self</span>.<span class="ident">set_word_pos</span>(<span class="ident">wp</span>); |
| } |
| } |
| |
| <span class="doccomment">/// Get the stream number.</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_stream</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">u64</span> { |
| <span class="self">self</span>.<span class="ident">rng</span> |
| .<span class="ident">core</span> |
| .<span class="ident">state</span> |
| .<span class="ident">get_nonce</span>() |
| } |
| |
| <span class="doccomment">/// Get the seed.</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_seed</span>(<span class="kw-2">&</span><span class="self">self</span>) -> [<span class="ident">u8</span>; <span class="number">32</span>] { |
| <span class="self">self</span>.<span class="ident">rng</span> |
| .<span class="ident">core</span> |
| .<span class="ident">state</span> |
| .<span class="ident">get_seed</span>() |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">CryptoRng</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ChaChaXRng</span> {} |
| |
| <span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">ChaChaXCore</span><span class="op">></span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ChaChaXRng</span> { |
| <span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">core</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ChaChaXCore</span>) -> <span class="self">Self</span> { |
| <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ChaChaXRng</span> { |
| <span class="ident">rng</span>: <span class="ident">BlockRng::new</span>(<span class="ident">core</span>), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">PartialEq</span><span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">ChaChaXRng</span><span class="op">></span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ChaChaXRng</span> { |
| <span class="kw">fn</span> <span class="ident">eq</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">rhs</span>: <span class="kw-2">&</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">ChaChaXRng</span>) -> <span class="ident">bool</span> { |
| <span class="kw">let</span> <span class="ident">a</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">abst</span>::<span class="macro-nonterminal">$</span><span class="macro-nonterminal">ChaChaXRng</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">into</span>(); |
| <span class="kw">let</span> <span class="ident">b</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">abst</span>::<span class="macro-nonterminal">$</span><span class="macro-nonterminal">ChaChaXRng</span> <span class="op">=</span> <span class="ident">rhs</span>.<span class="ident">into</span>(); |
| <span class="ident">a</span> <span class="op">==</span> <span class="ident">b</span> |
| } |
| } |
| <span class="kw">impl</span> <span class="ident">Eq</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ChaChaXRng</span> {} |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"serde1"</span>)]</span> |
| <span class="kw">impl</span> <span class="ident">Serialize</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ChaChaXRng</span> { |
| <span class="kw">fn</span> <span class="ident">serialize</span><span class="op"><</span><span class="ident">S</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">s</span>: <span class="ident">S</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">S::Ok</span>, <span class="ident">S::Error</span><span class="op">></span> |
| <span class="kw">where</span> <span class="ident">S</span>: <span class="ident">Serializer</span> { |
| <span class="macro-nonterminal">$</span><span class="macro-nonterminal">abst</span>::<span class="macro-nonterminal">$</span><span class="macro-nonterminal">ChaChaXRng::from</span>(<span class="self">self</span>).<span class="ident">serialize</span>(<span class="ident">s</span>) |
| } |
| } |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"serde1"</span>)]</span> |
| <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'de</span><span class="op">></span> <span class="ident">Deserialize</span><span class="op"><</span><span class="lifetime">'de</span><span class="op">></span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ChaChaXRng</span> { |
| <span class="kw">fn</span> <span class="ident">deserialize</span><span class="op"><</span><span class="ident">D</span><span class="op">></span>(<span class="ident">d</span>: <span class="ident">D</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span>, <span class="ident">D::Error</span><span class="op">></span> <span class="kw">where</span> <span class="ident">D</span>: <span class="ident">Deserializer</span><span class="op"><</span><span class="lifetime">'de</span><span class="op">></span> { |
| <span class="macro-nonterminal">$</span><span class="macro-nonterminal">abst</span>::<span class="macro-nonterminal">$</span><span class="macro-nonterminal">ChaChaXRng::deserialize</span>(<span class="ident">d</span>).<span class="ident">map</span>(<span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="ident"><span class="self">Self</span>::from</span>(<span class="kw-2">&</span><span class="ident">x</span>)) |
| } |
| } |
| |
| <span class="kw">mod</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">abst</span> { |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"serde1"</span>)]</span> <span class="kw">use</span> <span class="ident">serde</span>::{<span class="ident">Serialize</span>, <span class="ident">Deserialize</span>}; |
| |
| <span class="comment">// The abstract state of a ChaCha stream, independent of implementation choices. The</span> |
| <span class="comment">// comparison and serialization of this object is considered a semver-covered part of</span> |
| <span class="comment">// the API.</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">PartialEq</span>, <span class="ident">Eq</span>)]</span> |
| <span class="attribute">#[<span class="ident">cfg_attr</span>( |
| <span class="ident">feature</span> <span class="op">=</span> <span class="string">"serde1"</span>, |
| <span class="ident">derive</span>(<span class="ident">Serialize</span>, <span class="ident">Deserialize</span>), |
| )]</span> |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ChaChaXRng</span> { |
| <span class="ident">seed</span>: [<span class="ident">u8</span>; <span class="number">32</span>], |
| <span class="ident">stream</span>: <span class="ident">u64</span>, |
| <span class="ident">word_pos</span>: <span class="ident">u128</span>, |
| } |
| |
| <span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="kw-2">&</span><span class="kw">super</span>::<span class="macro-nonterminal">$</span><span class="macro-nonterminal">ChaChaXRng</span><span class="op">></span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ChaChaXRng</span> { |
| <span class="comment">// Forget all information about the input except what is necessary to determine the</span> |
| <span class="comment">// outputs of any sequence of pub API calls.</span> |
| <span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">r</span>: <span class="kw-2">&</span><span class="kw">super</span>::<span class="macro-nonterminal">$</span><span class="macro-nonterminal">ChaChaXRng</span>) -> <span class="self">Self</span> { |
| <span class="self">Self</span> { |
| <span class="ident">seed</span>: <span class="ident">r</span>.<span class="ident">get_seed</span>(), |
| <span class="ident">stream</span>: <span class="ident">r</span>.<span class="ident">get_stream</span>(), |
| <span class="ident">word_pos</span>: <span class="ident">r</span>.<span class="ident">get_word_pos</span>(), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="kw-2">&</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">ChaChaXRng</span><span class="op">></span> <span class="kw">for</span> <span class="kw">super</span>::<span class="macro-nonterminal">$</span><span class="macro-nonterminal">ChaChaXRng</span> { |
| <span class="comment">// Construct one of the possible concrete RNGs realizing an abstract state.</span> |
| <span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">a</span>: <span class="kw-2">&</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">ChaChaXRng</span>) -> <span class="self">Self</span> { |
| <span class="kw">use</span> <span class="ident">rand_core::SeedableRng</span>; |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident"><span class="self">Self</span>::from_seed</span>(<span class="ident">a</span>.<span class="ident">seed</span>); |
| <span class="ident">r</span>.<span class="ident">set_stream</span>(<span class="ident">a</span>.<span class="ident">stream</span>); |
| <span class="ident">r</span>.<span class="ident">set_word_pos</span>(<span class="ident">a</span>.<span class="ident">word_pos</span>); |
| <span class="ident">r</span> |
| } |
| } |
| } |
| } |
| } |
| |
| <span class="macro">chacha_impl!</span>(<span class="ident">ChaCha20Core</span>, <span class="ident">ChaCha20Rng</span>, <span class="number">10</span>, <span class="string">"ChaCha with 20 rounds"</span>, <span class="ident">abstract20</span>); |
| <span class="macro">chacha_impl!</span>(<span class="ident">ChaCha12Core</span>, <span class="ident">ChaCha12Rng</span>, <span class="number">6</span>, <span class="string">"ChaCha with 12 rounds"</span>, <span class="ident">abstract12</span>); |
| <span class="macro">chacha_impl!</span>(<span class="ident">ChaCha8Core</span>, <span class="ident">ChaCha8Rng</span>, <span class="number">4</span>, <span class="string">"ChaCha with 8 rounds"</span>, <span class="ident">abstract8</span>); |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span> |
| <span class="kw">mod</span> <span class="ident">test</span> { |
| <span class="kw">use</span> <span class="ident">rand_core</span>::{<span class="ident">RngCore</span>, <span class="ident">SeedableRng</span>}; |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"serde1"</span>)]</span> <span class="kw">use</span> <span class="kw">super</span>::{<span class="ident">ChaCha20Rng</span>, <span class="ident">ChaCha12Rng</span>, <span class="ident">ChaCha8Rng</span>}; |
| |
| <span class="kw">type</span> <span class="ident">ChaChaRng</span> <span class="op">=</span> <span class="ident"><span class="kw">super</span>::ChaCha20Rng</span>; |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"serde1"</span>)]</span> |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">test_chacha_serde_roundtrip</span>() { |
| <span class="kw">let</span> <span class="ident">seed</span> <span class="op">=</span> [ |
| <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> <span class="ident">rng1</span> <span class="op">=</span> <span class="ident">ChaCha20Rng::from_seed</span>(<span class="ident">seed</span>); |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rng2</span> <span class="op">=</span> <span class="ident">ChaCha12Rng::from_seed</span>(<span class="ident">seed</span>); |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rng3</span> <span class="op">=</span> <span class="ident">ChaCha8Rng::from_seed</span>(<span class="ident">seed</span>); |
| |
| <span class="kw">let</span> <span class="ident">encoded1</span> <span class="op">=</span> <span class="ident">serde_json::to_string</span>(<span class="kw-2">&</span><span class="ident">rng1</span>).<span class="ident">unwrap</span>(); |
| <span class="kw">let</span> <span class="ident">encoded2</span> <span class="op">=</span> <span class="ident">serde_json::to_string</span>(<span class="kw-2">&</span><span class="ident">rng2</span>).<span class="ident">unwrap</span>(); |
| <span class="kw">let</span> <span class="ident">encoded3</span> <span class="op">=</span> <span class="ident">serde_json::to_string</span>(<span class="kw-2">&</span><span class="ident">rng3</span>).<span class="ident">unwrap</span>(); |
| |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">decoded1</span>: <span class="ident">ChaCha20Rng</span> <span class="op">=</span> <span class="ident">serde_json::from_str</span>(<span class="kw-2">&</span><span class="ident">encoded1</span>).<span class="ident">unwrap</span>(); |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">decoded2</span>: <span class="ident">ChaCha12Rng</span> <span class="op">=</span> <span class="ident">serde_json::from_str</span>(<span class="kw-2">&</span><span class="ident">encoded2</span>).<span class="ident">unwrap</span>(); |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">decoded3</span>: <span class="ident">ChaCha8Rng</span> <span class="op">=</span> <span class="ident">serde_json::from_str</span>(<span class="kw-2">&</span><span class="ident">encoded3</span>).<span class="ident">unwrap</span>(); |
| |
| <span class="macro">assert_eq!</span>(<span class="ident">rng1</span>, <span class="ident">decoded1</span>); |
| <span class="macro">assert_eq!</span>(<span class="ident">rng2</span>, <span class="ident">decoded2</span>); |
| <span class="macro">assert_eq!</span>(<span class="ident">rng3</span>, <span class="ident">decoded3</span>); |
| |
| <span class="macro">assert_eq!</span>(<span class="ident">rng1</span>.<span class="ident">next_u32</span>(), <span class="ident">decoded1</span>.<span class="ident">next_u32</span>()); |
| <span class="macro">assert_eq!</span>(<span class="ident">rng2</span>.<span class="ident">next_u32</span>(), <span class="ident">decoded2</span>.<span class="ident">next_u32</span>()); |
| <span class="macro">assert_eq!</span>(<span class="ident">rng3</span>.<span class="ident">next_u32</span>(), <span class="ident">decoded3</span>.<span class="ident">next_u32</span>()); |
| } |
| |
| <span class="comment">// This test validates that:</span> |
| <span class="comment">// 1. a hard-coded serialization demonstrating the format at time of initial release can still</span> |
| <span class="comment">// be deserialized to a ChaChaRng</span> |
| <span class="comment">// 2. re-serializing the resultant object produces exactly the original string</span> |
| <span class="comment">//</span> |
| <span class="comment">// Condition 2 is stronger than necessary: an equivalent serialization (e.g. with field order</span> |
| <span class="comment">// permuted, or whitespace differences) would also be admissible, but would fail this test.</span> |
| <span class="comment">// However testing for equivalence of serialized data is difficult, and there shouldn't be any</span> |
| <span class="comment">// reason we need to violate the stronger-than-needed condition, e.g. by changing the field</span> |
| <span class="comment">// definition order.</span> |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"serde1"</span>)]</span> |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">test_chacha_serde_format_stability</span>() { |
| <span class="kw">let</span> <span class="ident">j</span> <span class="op">=</span> <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> <span class="ident">r</span>: <span class="ident">ChaChaRng</span> <span class="op">=</span> <span class="ident">serde_json::from_str</span>(<span class="kw-2">&</span><span class="ident">j</span>).<span class="ident">unwrap</span>(); |
| <span class="kw">let</span> <span class="ident">j1</span> <span class="op">=</span> <span class="ident">serde_json::to_string</span>(<span class="kw-2">&</span><span class="ident">r</span>).<span class="ident">unwrap</span>(); |
| <span class="macro">assert_eq!</span>(<span class="ident">j</span>, <span class="ident">j1</span>); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">test_chacha_construction</span>() { |
| <span class="kw">let</span> <span class="ident">seed</span> <span class="op">=</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="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> <span class="ident">rng1</span> <span class="op">=</span> <span class="ident">ChaChaRng::from_seed</span>(<span class="ident">seed</span>); |
| <span class="macro">assert_eq!</span>(<span class="ident">rng1</span>.<span class="ident">next_u32</span>(), <span class="number">137206642</span>); |
| |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rng2</span> <span class="op">=</span> <span class="ident">ChaChaRng::from_rng</span>(<span class="ident">rng1</span>).<span class="ident">unwrap</span>(); |
| <span class="macro">assert_eq!</span>(<span class="ident">rng2</span>.<span class="ident">next_u32</span>(), <span class="number">1325750369</span>); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">test_chacha_true_values_a</span>() { |
| <span class="comment">// Test vectors 1 and 2 from</span> |
| <span class="comment">// https://tools.ietf.org/html/draft-nir-cfrg-chacha20-poly1305-04</span> |
| <span class="kw">let</span> <span class="ident">seed</span> <span class="op">=</span> [<span class="number">0u8</span>; <span class="number">32</span>]; |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rng</span> <span class="op">=</span> <span class="ident">ChaChaRng::from_seed</span>(<span class="ident">seed</span>); |
| |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">results</span> <span class="op">=</span> [<span class="number">0u32</span>; <span class="number">16</span>]; |
| <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="ident">results</span>.<span class="ident">iter_mut</span>() { |
| <span class="kw-2">*</span><span class="ident">i</span> <span class="op">=</span> <span class="ident">rng</span>.<span class="ident">next_u32</span>(); |
| } |
| <span class="kw">let</span> <span class="ident">expected</span> <span class="op">=</span> [ |
| <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>(<span class="ident">results</span>, <span class="ident">expected</span>); |
| |
| <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="ident">results</span>.<span class="ident">iter_mut</span>() { |
| <span class="kw-2">*</span><span class="ident">i</span> <span class="op">=</span> <span class="ident">rng</span>.<span class="ident">next_u32</span>(); |
| } |
| <span class="kw">let</span> <span class="ident">expected</span> <span class="op">=</span> [ |
| <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>(<span class="ident">results</span>, <span class="ident">expected</span>); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">test_chacha_true_values_b</span>() { |
| <span class="comment">// Test vector 3 from</span> |
| <span class="comment">// https://tools.ietf.org/html/draft-nir-cfrg-chacha20-poly1305-04</span> |
| <span class="kw">let</span> <span class="ident">seed</span> <span class="op">=</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">0</span>, <span class="number">1</span>, |
| ]; |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rng</span> <span class="op">=</span> <span class="ident">ChaChaRng::from_seed</span>(<span class="ident">seed</span>); |
| |
| <span class="comment">// Skip block 0</span> |
| <span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">16</span> { |
| <span class="ident">rng</span>.<span class="ident">next_u32</span>(); |
| } |
| |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">results</span> <span class="op">=</span> [<span class="number">0u32</span>; <span class="number">16</span>]; |
| <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="ident">results</span>.<span class="ident">iter_mut</span>() { |
| <span class="kw-2">*</span><span class="ident">i</span> <span class="op">=</span> <span class="ident">rng</span>.<span class="ident">next_u32</span>(); |
| } |
| <span class="kw">let</span> <span class="ident">expected</span> <span class="op">=</span> [ |
| <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>(<span class="ident">results</span>, <span class="ident">expected</span>); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">test_chacha_true_values_c</span>() { |
| <span class="comment">// Test vector 4 from</span> |
| <span class="comment">// https://tools.ietf.org/html/draft-nir-cfrg-chacha20-poly1305-04</span> |
| <span class="kw">let</span> <span class="ident">seed</span> <span class="op">=</span> [ |
| <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> <span class="ident">expected</span> <span class="op">=</span> [ |
| <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> <span class="ident">expected_end</span> <span class="op">=</span> <span class="number">3</span> <span class="op">*</span> <span class="number">16</span>; |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">results</span> <span class="op">=</span> [<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> <span class="ident">rng1</span> <span class="op">=</span> <span class="ident">ChaChaRng::from_seed</span>(<span class="ident">seed</span>); |
| <span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">32</span> { |
| <span class="ident">rng1</span>.<span class="ident">next_u32</span>(); |
| } |
| <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="ident">results</span>.<span class="ident">iter_mut</span>() { |
| <span class="kw-2">*</span><span class="ident">i</span> <span class="op">=</span> <span class="ident">rng1</span>.<span class="ident">next_u32</span>(); |
| } |
| <span class="macro">assert_eq!</span>(<span class="ident">results</span>, <span class="ident">expected</span>); |
| <span class="macro">assert_eq!</span>(<span class="ident">rng1</span>.<span class="ident">get_word_pos</span>(), <span class="ident">expected_end</span>); |
| |
| <span class="comment">// Test block 2 by using `set_word_pos`</span> |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rng2</span> <span class="op">=</span> <span class="ident">ChaChaRng::from_seed</span>(<span class="ident">seed</span>); |
| <span class="ident">rng2</span>.<span class="ident">set_word_pos</span>(<span class="number">2</span> <span class="op">*</span> <span class="number">16</span>); |
| <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="ident">results</span>.<span class="ident">iter_mut</span>() { |
| <span class="kw-2">*</span><span class="ident">i</span> <span class="op">=</span> <span class="ident">rng2</span>.<span class="ident">next_u32</span>(); |
| } |
| <span class="macro">assert_eq!</span>(<span class="ident">results</span>, <span class="ident">expected</span>); |
| <span class="macro">assert_eq!</span>(<span class="ident">rng2</span>.<span class="ident">get_word_pos</span>(), <span class="ident">expected_end</span>); |
| |
| <span class="comment">// Test skipping behaviour with other types</span> |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf</span> <span class="op">=</span> [<span class="number">0u8</span>; <span class="number">32</span>]; |
| <span class="ident">rng2</span>.<span class="ident">fill_bytes</span>(<span class="kw-2">&mut</span> <span class="ident">buf</span>[..]); |
| <span class="macro">assert_eq!</span>(<span class="ident">rng2</span>.<span class="ident">get_word_pos</span>(), <span class="ident">expected_end</span> <span class="op">+</span> <span class="number">8</span>); |
| <span class="ident">rng2</span>.<span class="ident">fill_bytes</span>(<span class="kw-2">&mut</span> <span class="ident">buf</span>[<span class="number">0</span>..<span class="number">25</span>]); |
| <span class="macro">assert_eq!</span>(<span class="ident">rng2</span>.<span class="ident">get_word_pos</span>(), <span class="ident">expected_end</span> <span class="op">+</span> <span class="number">15</span>); |
| <span class="ident">rng2</span>.<span class="ident">next_u64</span>(); |
| <span class="macro">assert_eq!</span>(<span class="ident">rng2</span>.<span class="ident">get_word_pos</span>(), <span class="ident">expected_end</span> <span class="op">+</span> <span class="number">17</span>); |
| <span class="ident">rng2</span>.<span class="ident">next_u32</span>(); |
| <span class="ident">rng2</span>.<span class="ident">next_u64</span>(); |
| <span class="macro">assert_eq!</span>(<span class="ident">rng2</span>.<span class="ident">get_word_pos</span>(), <span class="ident">expected_end</span> <span class="op">+</span> <span class="number">20</span>); |
| <span class="ident">rng2</span>.<span class="ident">fill_bytes</span>(<span class="kw-2">&mut</span> <span class="ident">buf</span>[<span class="number">0</span>..<span class="number">1</span>]); |
| <span class="macro">assert_eq!</span>(<span class="ident">rng2</span>.<span class="ident">get_word_pos</span>(), <span class="ident">expected_end</span> <span class="op">+</span> <span class="number">21</span>); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">test_chacha_multiple_blocks</span>() { |
| <span class="kw">let</span> <span class="ident">seed</span> <span class="op">=</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">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> <span class="ident">rng</span> <span class="op">=</span> <span class="ident">ChaChaRng::from_seed</span>(<span class="ident">seed</span>); |
| |
| <span class="comment">// Store the 17*i-th 32-bit word,</span> |
| <span class="comment">// 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> <span class="ident">results</span> <span class="op">=</span> [<span class="number">0u32</span>; <span class="number">16</span>]; |
| <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="ident">results</span>.<span class="ident">iter_mut</span>() { |
| <span class="kw-2">*</span><span class="ident">i</span> <span class="op">=</span> <span class="ident">rng</span>.<span class="ident">next_u32</span>(); |
| <span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">16</span> { |
| <span class="ident">rng</span>.<span class="ident">next_u32</span>(); |
| } |
| } |
| <span class="kw">let</span> <span class="ident">expected</span> <span class="op">=</span> [ |
| <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>(<span class="ident">results</span>, <span class="ident">expected</span>); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">test_chacha_true_bytes</span>() { |
| <span class="kw">let</span> <span class="ident">seed</span> <span class="op">=</span> [<span class="number">0u8</span>; <span class="number">32</span>]; |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rng</span> <span class="op">=</span> <span class="ident">ChaChaRng::from_seed</span>(<span class="ident">seed</span>); |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">results</span> <span class="op">=</span> [<span class="number">0u8</span>; <span class="number">32</span>]; |
| <span class="ident">rng</span>.<span class="ident">fill_bytes</span>(<span class="kw-2">&mut</span> <span class="ident">results</span>); |
| <span class="kw">let</span> <span class="ident">expected</span> <span class="op">=</span> [ |
| <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>(<span class="ident">results</span>, <span class="ident">expected</span>); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">test_chacha_nonce</span>() { |
| <span class="comment">// Test vector 5 from</span> |
| <span class="comment">// https://tools.ietf.org/html/draft-nir-cfrg-chacha20-poly1305-04</span> |
| <span class="comment">// Although we do not support setting a nonce, we try it here anyway so</span> |
| <span class="comment">// we can use this test vector.</span> |
| <span class="kw">let</span> <span class="ident">seed</span> <span class="op">=</span> [<span class="number">0u8</span>; <span class="number">32</span>]; |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rng</span> <span class="op">=</span> <span class="ident">ChaChaRng::from_seed</span>(<span class="ident">seed</span>); |
| <span class="comment">// 96-bit nonce in LE order is: 0,0,0,0, 0,0,0,0, 0,0,0,2</span> |
| <span class="ident">rng</span>.<span class="ident">set_stream</span>(<span class="number">2u64</span> <span class="op"><</span><span class="op"><</span> (<span class="number">24</span> <span class="op">+</span> <span class="number">32</span>)); |
| |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">results</span> <span class="op">=</span> [<span class="number">0u32</span>; <span class="number">16</span>]; |
| <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="ident">results</span>.<span class="ident">iter_mut</span>() { |
| <span class="kw-2">*</span><span class="ident">i</span> <span class="op">=</span> <span class="ident">rng</span>.<span class="ident">next_u32</span>(); |
| } |
| <span class="kw">let</span> <span class="ident">expected</span> <span class="op">=</span> [ |
| <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>(<span class="ident">results</span>, <span class="ident">expected</span>); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">test_chacha_clone_streams</span>() { |
| <span class="kw">let</span> <span class="ident">seed</span> <span class="op">=</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">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> <span class="ident">rng</span> <span class="op">=</span> <span class="ident">ChaChaRng::from_seed</span>(<span class="ident">seed</span>); |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">clone</span> <span class="op">=</span> <span class="ident">rng</span>.<span class="ident">clone</span>(); |
| <span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">16</span> { |
| <span class="macro">assert_eq!</span>(<span class="ident">rng</span>.<span class="ident">next_u64</span>(), <span class="ident">clone</span>.<span class="ident">next_u64</span>()); |
| } |
| |
| <span class="ident">rng</span>.<span class="ident">set_stream</span>(<span class="number">51</span>); |
| <span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">7</span> { |
| <span class="macro">assert!</span>(<span class="ident">rng</span>.<span class="ident">next_u32</span>() <span class="op">!</span><span class="op">=</span> <span class="ident">clone</span>.<span class="ident">next_u32</span>()); |
| } |
| <span class="ident">clone</span>.<span class="ident">set_stream</span>(<span class="number">51</span>); <span class="comment">// switch part way through block</span> |
| <span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">7</span>..<span class="number">16</span> { |
| <span class="macro">assert_eq!</span>(<span class="ident">rng</span>.<span class="ident">next_u32</span>(), <span class="ident">clone</span>.<span class="ident">next_u32</span>()); |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">test_chacha_word_pos_wrap_exact</span>() { |
| <span class="kw">use</span> <span class="kw">super</span>::{<span class="ident">BUF_BLOCKS</span>, <span class="ident">BLOCK_WORDS</span>}; |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rng</span> <span class="op">=</span> <span class="ident">ChaChaRng::from_seed</span>(<span class="ident">Default::default</span>()); |
| <span class="comment">// refilling the buffer in set_word_pos will wrap the block counter to 0</span> |
| <span class="kw">let</span> <span class="ident">last_block</span> <span class="op">=</span> (<span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="number">68</span>) <span class="op">-</span> <span class="ident">u128::from</span>(<span class="ident">BUF_BLOCKS</span> <span class="op">*</span> <span class="ident">BLOCK_WORDS</span>); |
| <span class="ident">rng</span>.<span class="ident">set_word_pos</span>(<span class="ident">last_block</span>); |
| <span class="macro">assert_eq!</span>(<span class="ident">rng</span>.<span class="ident">get_word_pos</span>(), <span class="ident">last_block</span>); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">test_chacha_word_pos_wrap_excess</span>() { |
| <span class="kw">use</span> <span class="ident"><span class="kw">super</span>::BLOCK_WORDS</span>; |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rng</span> <span class="op">=</span> <span class="ident">ChaChaRng::from_seed</span>(<span class="ident">Default::default</span>()); |
| <span class="comment">// refilling the buffer in set_word_pos will wrap the block counter past 0</span> |
| <span class="kw">let</span> <span class="ident">last_block</span> <span class="op">=</span> (<span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="number">68</span>) <span class="op">-</span> <span class="ident">u128::from</span>(<span class="ident">BLOCK_WORDS</span>); |
| <span class="ident">rng</span>.<span class="ident">set_word_pos</span>(<span class="ident">last_block</span>); |
| <span class="macro">assert_eq!</span>(<span class="ident">rng</span>.<span class="ident">get_word_pos</span>(), <span class="ident">last_block</span>); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">test_chacha_word_pos_zero</span>() { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rng</span> <span class="op">=</span> <span class="ident">ChaChaRng::from_seed</span>(<span class="ident">Default::default</span>()); |
| <span class="macro">assert_eq!</span>(<span class="ident">rng</span>.<span class="ident">get_word_pos</span>(), <span class="number">0</span>); |
| <span class="ident">rng</span>.<span class="ident">set_word_pos</span>(<span class="number">0</span>); |
| <span class="macro">assert_eq!</span>(<span class="ident">rng</span>.<span class="ident">get_word_pos</span>(), <span class="number">0</span>); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">test_trait_objects</span>() { |
| <span class="kw">use</span> <span class="ident">rand_core::CryptoRngCore</span>; |
| |
| <span class="kw">let</span> <span class="ident">rng</span> <span class="op">=</span> <span class="kw-2">&mut</span> <span class="ident">ChaChaRng::from_seed</span>(<span class="ident">Default::default</span>()) <span class="kw">as</span> <span class="kw-2">&mut</span> <span class="kw">dyn</span> <span class="ident">CryptoRngCore</span>; |
| <span class="kw">let</span> <span class="ident">r1</span> <span class="op">=</span> <span class="ident">rng</span>.<span class="ident">next_u64</span>(); |
| <span class="kw">let</span> <span class="ident">rng</span>: <span class="kw-2">&mut</span> <span class="kw">dyn</span> <span class="ident">RngCore</span> <span class="op">=</span> <span class="ident">rng</span>.<span class="ident">as_rngcore</span>(); |
| <span class="kw">let</span> <span class="ident">r2</span> <span class="op">=</span> <span class="ident">rng</span>.<span class="ident">next_u64</span>(); |
| <span class="macro">assert_ne!</span>(<span class="ident">r1</span>, <span class="ident">r2</span>); |
| } |
| } |
| </code></pre></div> |
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