1// Copyright 2018-2024 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 AUTHORS DISCLAIM ALL WARRANTIES
8// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
9// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS 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
15#![cfg(any(
16 all(target_arch = "aarch64", target_endian = "little"),
17 target_arch = "x86",
18 target_arch = "x86_64"
19))]
20
21use super::{ffi::KeyValue, HTable, UpdateBlock, Xi};
22use crate::aead::gcm::ffi::BLOCK_LEN;
23use crate::cpu;
24#[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
25use {super::UpdateBlocks, crate::polyfill::slice::AsChunks};
26
27#[cfg(all(target_arch = "aarch64", target_endian = "little"))]
28pub(in super::super) type RequiredCpuFeatures = cpu::arm::PMull;
29
30#[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
31pub(in super::super) type RequiredCpuFeatures = (cpu::intel::ClMul, cpu::intel::Ssse3);
32
33#[derive(Clone)]
34pub struct Key {
35 h_table: HTable,
36}
37
38impl Key {
39 pub(in super::super) fn new(value: KeyValue, _cpu: RequiredCpuFeatures) -> Self {
40 Self {
41 h_table: unsafe { htable_new!(gcm_init_clmul, value) },
42 }
43 }
44
45 #[cfg(target_arch = "aarch64")]
46 pub(super) fn inner(&self) -> &HTable {
47 &self.h_table
48 }
49}
50
51impl UpdateBlock for Key {
52 #[cfg(target_arch = "aarch64")]
53 fn update_block(&self, xi: &mut Xi, a: [u8; BLOCK_LEN]) {
54 prefixed_extern! {
55 fn gcm_gmult_clmul(xi: &mut Xi, Htable: &HTable);
56 }
57 xi.bitxor_assign(a);
58 unsafe { self.h_table.gmult(gcm_gmult_clmul, xi) };
59 }
60
61 #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
62 fn update_block(&self, xi: &mut Xi, a: [u8; BLOCK_LEN]) {
63 self.update_blocks(xi, (&a).into())
64 }
65}
66
67#[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
68impl UpdateBlocks for Key {
69 fn update_blocks(&self, xi: &mut Xi, input: AsChunks<u8, { BLOCK_LEN }>) {
70 unsafe { ghash!(gcm_ghash_clmul, xi, &self.h_table, input) }
71 }
72}
73