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| </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-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
