ring/digest/sha2/
sha2_32.rs

1// Copyright 2024 Brian Smith.
2//
3// Permission to use, copy, modify, and/or distribute this software for any
4// purpose with or without fee is hereby granted, provided that the above
5// copyright notice and this permission notice appear in all copies.
6//
7// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
8// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
9// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
10// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
11// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
12// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
13// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
14
15use super::{BlockLen, CHAINING_WORDS};
16use crate::{cpu, polyfill::slice::AsChunks};
17use cfg_if::cfg_if;
18use core::num::Wrapping;
19
20pub(in super::super) const SHA256_BLOCK_LEN: BlockLen = BlockLen::_512;
21
22pub type State32 = [Wrapping<u32>; CHAINING_WORDS];
23
24pub(crate) fn block_data_order_32(
25    state: &mut State32,
26    data: AsChunks<u8, { SHA256_BLOCK_LEN.into() }>,
27    cpu: cpu::Features,
28) {
29    cfg_if! {
30        if #[cfg(all(target_arch = "aarch64", target_endian = "little"))] {
31            use cpu::{GetFeature as _, arm::Sha256};
32            if let Some(cpu) = cpu.get_feature() {
33                sha2_32_ffi!(unsafe { Sha256 => sha256_block_data_order_hw }, state, data, cpu)
34            } else {
35                sha2_32_ffi!(unsafe { () => sha256_block_data_order_nohw }, state, data, ())
36            }
37        } else if #[cfg(all(target_arch = "arm", target_endian = "little"))] {
38            use cpu::{GetFeature as _, arm::Neon};
39            if let Some(cpu) = cpu.get_feature() {
40                sha2_32_ffi!(unsafe { Neon => sha256_block_data_order_neon }, state, data, cpu)
41            } else {
42                sha2_32_ffi!(unsafe { () => sha256_block_data_order_nohw }, state, data, ())
43            }
44        } else if #[cfg(target_arch = "x86_64")] {
45            use cpu::{GetFeature as _, intel::{Avx, IntelCpu, Sha, Ssse3 }};
46            let cpu = cpu.values();
47            if let Some(cpu) = cpu.get_feature() {
48                sha2_32_ffi!(unsafe { (Sha, Ssse3) => sha256_block_data_order_hw }, state, data, cpu)
49            } else if let Some(cpu) = cpu.get_feature() {
50                // Pre-Zen AMD CPUs had slow SHLD/SHRD; Zen added the SHA
51                // extension; see the discussion in upstream's sha1-586.pl.
52                sha2_32_ffi!(unsafe { (Avx, IntelCpu) => sha256_block_data_order_avx }, state, data, cpu)
53            } else if let Some(cpu) = cpu.get_feature() {
54                sha2_32_ffi!(unsafe { Ssse3 => sha256_block_data_order_ssse3 }, state, data, cpu)
55            } else {
56                sha2_32_ffi!(unsafe { () => sha256_block_data_order_nohw }, state, data, ())
57            }
58        } else {
59            let _ = cpu; // Unneeded.
60            *state = super::fallback::block_data_order(*state, data)
61        }
62    }
63}
ring/digest/sha2/sha2_32.rs

ring/digest/sha2/
sha2_32.rs
