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//! Low-level "hazmat" AES functions: AES-NI support.
//!
//! Note: this isn't actually used in the `Aes128`/`Aes192`/`Aes256`
//! implementations in this crate, but instead provides raw AES-NI accelerated
//! access to the AES round function gated under the `hazmat` crate feature.
use super::{
arch::*,
utils::{load8, store8},
};
use crate::{Block, ParBlocks};
/// AES cipher (encrypt) round function.
#[allow(clippy::cast_ptr_alignment)]
#[target_feature(enable = "aes")]
pub(crate) unsafe fn cipher_round(block: &mut Block, round_key: &Block) {
// Safety: `loadu` and `storeu` support unaligned access
let b = _mm_loadu_si128(block.as_ptr() as *const __m128i);
let k = _mm_loadu_si128(round_key.as_ptr() as *const __m128i);
let out = _mm_aesenc_si128(b, k);
_mm_storeu_si128(block.as_mut_ptr() as *mut __m128i, out);
}
/// AES cipher (encrypt) round function: parallel version.
#[allow(clippy::cast_ptr_alignment)]
#[target_feature(enable = "aes")]
pub(crate) unsafe fn cipher_round_par(blocks: &mut ParBlocks, round_keys: &ParBlocks) {
let xmm_keys = load8(round_keys);
let mut xmm_blocks = load8(blocks);
for i in 0..8 {
xmm_blocks[i] = _mm_aesenc_si128(xmm_blocks[i], xmm_keys[i]);
}
store8(blocks, xmm_blocks);
}
/// AES cipher (encrypt) round function.
#[allow(clippy::cast_ptr_alignment)]
#[target_feature(enable = "aes")]
pub(crate) unsafe fn equiv_inv_cipher_round(block: &mut Block, round_key: &Block) {
// Safety: `loadu` and `storeu` support unaligned access
let b = _mm_loadu_si128(block.as_ptr() as *const __m128i);
let k = _mm_loadu_si128(round_key.as_ptr() as *const __m128i);
let out = _mm_aesdec_si128(b, k);
_mm_storeu_si128(block.as_mut_ptr() as *mut __m128i, out);
}
/// AES cipher (encrypt) round function: parallel version.
#[allow(clippy::cast_ptr_alignment)]
#[target_feature(enable = "aes")]
pub(crate) unsafe fn equiv_inv_cipher_round_par(blocks: &mut ParBlocks, round_keys: &ParBlocks) {
let xmm_keys = load8(round_keys);
let mut xmm_blocks = load8(blocks);
for i in 0..8 {
xmm_blocks[i] = _mm_aesdec_si128(xmm_blocks[i], xmm_keys[i]);
}
store8(blocks, xmm_blocks);
}
/// AES mix columns function.
#[allow(clippy::cast_ptr_alignment)]
#[target_feature(enable = "aes")]
pub(crate) unsafe fn mix_columns(block: &mut Block) {
// Safety: `loadu` and `storeu` support unaligned access
let mut state = _mm_loadu_si128(block.as_ptr() as *const __m128i);
// Emulate mix columns by performing three inverse mix columns operations
state = _mm_aesimc_si128(state);
state = _mm_aesimc_si128(state);
state = _mm_aesimc_si128(state);
_mm_storeu_si128(block.as_mut_ptr() as *mut __m128i, state);
}
/// AES inverse mix columns function.
#[allow(clippy::cast_ptr_alignment)]
#[target_feature(enable = "aes")]
pub(crate) unsafe fn inv_mix_columns(block: &mut Block) {
// Safety: `loadu` and `storeu` support unaligned access
let b = _mm_loadu_si128(block.as_ptr() as *const __m128i);
let out = _mm_aesimc_si128(b);
_mm_storeu_si128(block.as_mut_ptr() as *mut __m128i, out);
}
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