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use super::{
arch::*,
utils::{aesdec8, aesdeclast8, aesenc8, aesenclast8, load8, store8, xor8, U128x8},
};
use crate::{Block, ParBlocks};
use cipher::{
consts::{U16, U8},
generic_array::GenericArray,
BlockCipher, BlockDecrypt, BlockEncrypt, NewBlockCipher,
};
mod expand;
#[cfg(test)]
mod test_expand;
type RoundKeys = [__m128i; 11];
#[derive(Clone)]
pub struct Aes128 {
encrypt_keys: RoundKeys,
decrypt_keys: RoundKeys,
}
impl Aes128 {
#[inline(always)]
pub(crate) fn encrypt8(&self, mut blocks: U128x8) -> U128x8 {
#[inline]
#[target_feature(enable = "aes")]
unsafe fn aesni128_encrypt8(keys: &RoundKeys, blocks: &mut U128x8) {
xor8(blocks, keys[0]);
aesenc8(blocks, keys[1]);
aesenc8(blocks, keys[2]);
aesenc8(blocks, keys[3]);
aesenc8(blocks, keys[4]);
aesenc8(blocks, keys[5]);
aesenc8(blocks, keys[6]);
aesenc8(blocks, keys[7]);
aesenc8(blocks, keys[8]);
aesenc8(blocks, keys[9]);
aesenclast8(blocks, keys[10]);
}
unsafe { aesni128_encrypt8(&self.encrypt_keys, &mut blocks) };
blocks
}
#[inline(always)]
pub(crate) fn encrypt(&self, block: __m128i) -> __m128i {
#[inline]
#[target_feature(enable = "aes")]
unsafe fn aesni128_encrypt1(keys: &RoundKeys, mut block: __m128i) -> __m128i {
block = _mm_xor_si128(block, keys[0]);
block = _mm_aesenc_si128(block, keys[1]);
block = _mm_aesenc_si128(block, keys[2]);
block = _mm_aesenc_si128(block, keys[3]);
block = _mm_aesenc_si128(block, keys[4]);
block = _mm_aesenc_si128(block, keys[5]);
block = _mm_aesenc_si128(block, keys[6]);
block = _mm_aesenc_si128(block, keys[7]);
block = _mm_aesenc_si128(block, keys[8]);
block = _mm_aesenc_si128(block, keys[9]);
_mm_aesenclast_si128(block, keys[10])
}
unsafe { aesni128_encrypt1(&self.encrypt_keys, block) }
}
}
impl NewBlockCipher for Aes128 {
type KeySize = U16;
#[inline]
fn new(key: &GenericArray<u8, U16>) -> Self {
let key = unsafe { &*(key as *const _ as *const [u8; 16]) };
let (encrypt_keys, decrypt_keys) = expand::expand(key);
Self {
encrypt_keys,
decrypt_keys,
}
}
}
impl BlockCipher for Aes128 {
type BlockSize = U16;
type ParBlocks = U8;
}
impl BlockEncrypt for Aes128 {
#[inline]
fn encrypt_block(&self, block: &mut Block) {
#[allow(clippy::cast_ptr_alignment)]
unsafe {
let b = _mm_loadu_si128(block.as_ptr() as *const __m128i);
let b = self.encrypt(b);
_mm_storeu_si128(block.as_mut_ptr() as *mut __m128i, b);
}
}
#[inline]
fn encrypt_par_blocks(&self, blocks: &mut ParBlocks) {
let b = self.encrypt8(load8(blocks));
store8(blocks, b);
}
}
impl BlockDecrypt for Aes128 {
#[inline]
fn decrypt_block(&self, block: &mut Block) {
#[inline]
#[target_feature(enable = "aes")]
unsafe fn aes128_decrypt1(block: &mut Block, keys: &RoundKeys) {
#[allow(clippy::cast_ptr_alignment)]
let mut b = _mm_loadu_si128(block.as_ptr() as *const __m128i);
b = _mm_xor_si128(b, keys[10]);
b = _mm_aesdec_si128(b, keys[9]);
b = _mm_aesdec_si128(b, keys[8]);
b = _mm_aesdec_si128(b, keys[7]);
b = _mm_aesdec_si128(b, keys[6]);
b = _mm_aesdec_si128(b, keys[5]);
b = _mm_aesdec_si128(b, keys[4]);
b = _mm_aesdec_si128(b, keys[3]);
b = _mm_aesdec_si128(b, keys[2]);
b = _mm_aesdec_si128(b, keys[1]);
b = _mm_aesdeclast_si128(b, keys[0]);
#[allow(clippy::cast_ptr_alignment)]
_mm_storeu_si128(block.as_mut_ptr() as *mut __m128i, b);
}
unsafe { aes128_decrypt1(block, &self.decrypt_keys) }
}
#[inline]
fn decrypt_par_blocks(&self, blocks: &mut ParBlocks) {
#[inline]
#[target_feature(enable = "aes")]
unsafe fn aes128_decrypt8(blocks: &mut ParBlocks, keys: &RoundKeys) {
let mut b = load8(blocks);
xor8(&mut b, keys[10]);
aesdec8(&mut b, keys[9]);
aesdec8(&mut b, keys[8]);
aesdec8(&mut b, keys[7]);
aesdec8(&mut b, keys[6]);
aesdec8(&mut b, keys[5]);
aesdec8(&mut b, keys[4]);
aesdec8(&mut b, keys[3]);
aesdec8(&mut b, keys[2]);
aesdec8(&mut b, keys[1]);
aesdeclast8(&mut b, keys[0]);
store8(blocks, b);
}
unsafe { aes128_decrypt8(blocks, &self.decrypt_keys) }
}
}
opaque_debug::implement!(Aes128);