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use crate::arch::*;
use block_cipher::consts::{U16, U8};
use block_cipher::generic_array::GenericArray;
use block_cipher::{BlockCipher, NewBlockCipher};
use crate::utils::{Block128, Block128x8};
mod expand;
#[cfg(test)]
mod test_expand;
#[derive(Copy, Clone)]
pub struct Aes128 {
encrypt_keys: [__m128i; 11],
decrypt_keys: [__m128i; 11],
}
impl Aes128 {
#[inline(always)]
pub(crate) fn encrypt8(&self, mut blocks: [__m128i; 8]) -> [__m128i; 8] {
let keys = self.encrypt_keys;
unsafe {
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]);
}
blocks
}
#[inline(always)]
pub(crate) fn encrypt(&self, mut block: __m128i) -> __m128i {
let keys = self.encrypt_keys;
unsafe {
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])
}
}
}
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;
#[inline]
fn encrypt_block(&self, block: &mut Block128) {
#[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 decrypt_block(&self, block: &mut Block128) {
let keys = self.decrypt_keys;
#[allow(clippy::cast_ptr_alignment)]
unsafe {
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]);
_mm_storeu_si128(block.as_mut_ptr() as *mut __m128i, b);
}
}
#[inline]
fn encrypt_blocks(&self, blocks: &mut Block128x8) {
unsafe {
let b = self.encrypt8(load8!(blocks));
store8!(blocks, b);
}
}
#[inline]
fn decrypt_blocks(&self, blocks: &mut Block128x8) {
let keys = self.decrypt_keys;
unsafe {
let mut b = load8!(blocks);
xor8!(b, keys[10]);
aesdec8!(b, keys[9]);
aesdec8!(b, keys[8]);
aesdec8!(b, keys[7]);
aesdec8!(b, keys[6]);
aesdec8!(b, keys[5]);
aesdec8!(b, keys[4]);
aesdec8!(b, keys[3]);
aesdec8!(b, keys[2]);
aesdec8!(b, keys[1]);
aesdeclast8!(b, keys[0]);
store8!(blocks, b);
}
}
}
opaque_debug::implement!(Aes128);