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/*
* Copyright (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
* This file is part of the "AES tools" project.
* For details, see https://github.com/egor-tensin/aes-tools.
* Distributed under the MIT License.
*/
#include <aes/all.h>
#include <emmintrin.h>
#include <wmmintrin.h>
AES_AES_Block __fastcall aes_AES256_encrypt_block_(
AES_AES_Block plaintext,
const AES_AES256_RoundKeys* encryption_keys)
{
plaintext = _mm_xor_si128(plaintext, encryption_keys->keys[0]);
plaintext = _mm_aesenc_si128(plaintext, encryption_keys->keys[1]);
plaintext = _mm_aesenc_si128(plaintext, encryption_keys->keys[2]);
plaintext = _mm_aesenc_si128(plaintext, encryption_keys->keys[3]);
plaintext = _mm_aesenc_si128(plaintext, encryption_keys->keys[4]);
plaintext = _mm_aesenc_si128(plaintext, encryption_keys->keys[5]);
plaintext = _mm_aesenc_si128(plaintext, encryption_keys->keys[6]);
plaintext = _mm_aesenc_si128(plaintext, encryption_keys->keys[7]);
plaintext = _mm_aesenc_si128(plaintext, encryption_keys->keys[8]);
plaintext = _mm_aesenc_si128(plaintext, encryption_keys->keys[9]);
plaintext = _mm_aesenc_si128(plaintext, encryption_keys->keys[10]);
plaintext = _mm_aesenc_si128(plaintext, encryption_keys->keys[11]);
plaintext = _mm_aesenc_si128(plaintext, encryption_keys->keys[12]);
plaintext = _mm_aesenc_si128(plaintext, encryption_keys->keys[13]);
return _mm_aesenclast_si128(plaintext, encryption_keys->keys[14]);
}
AES_AES_Block __fastcall aes_AES256_decrypt_block_(
AES_AES_Block ciphertext,
const AES_AES256_RoundKeys* decryption_keys)
{
ciphertext = _mm_xor_si128(ciphertext, decryption_keys->keys[0]);
ciphertext = _mm_aesdec_si128(ciphertext, decryption_keys->keys[1]);
ciphertext = _mm_aesdec_si128(ciphertext, decryption_keys->keys[2]);
ciphertext = _mm_aesdec_si128(ciphertext, decryption_keys->keys[3]);
ciphertext = _mm_aesdec_si128(ciphertext, decryption_keys->keys[4]);
ciphertext = _mm_aesdec_si128(ciphertext, decryption_keys->keys[5]);
ciphertext = _mm_aesdec_si128(ciphertext, decryption_keys->keys[6]);
ciphertext = _mm_aesdec_si128(ciphertext, decryption_keys->keys[7]);
ciphertext = _mm_aesdec_si128(ciphertext, decryption_keys->keys[8]);
ciphertext = _mm_aesdec_si128(ciphertext, decryption_keys->keys[9]);
ciphertext = _mm_aesdec_si128(ciphertext, decryption_keys->keys[10]);
ciphertext = _mm_aesdec_si128(ciphertext, decryption_keys->keys[11]);
ciphertext = _mm_aesdec_si128(ciphertext, decryption_keys->keys[12]);
ciphertext = _mm_aesdec_si128(ciphertext, decryption_keys->keys[13]);
return _mm_aesdeclast_si128(ciphertext, decryption_keys->keys[14]);
}
static AES_AES_Block __fastcall aes_aes256_expand_key_assist(
AES_AES_Block* prev_lo,
AES_AES_Block* prev_hi,
AES_AES_Block hwgen)
{
AES_AES_Block tmp = *prev_lo;
tmp = _mm_slli_si128(tmp, 4);
*prev_lo = _mm_xor_si128(*prev_lo, tmp);
tmp = _mm_slli_si128(tmp, 4);
*prev_lo = _mm_xor_si128(*prev_lo, tmp);
tmp = _mm_slli_si128(tmp, 4);
*prev_lo = _mm_xor_si128(*prev_lo, tmp);
*prev_lo = _mm_xor_si128(*prev_lo, hwgen);
*prev_hi = _mm_xor_si128(*prev_hi, *prev_lo);
*prev_lo = _mm_xor_si128(*prev_lo, *prev_hi);
*prev_hi = _mm_xor_si128(*prev_hi, *prev_lo);
return *prev_hi;
}
void __fastcall aes_AES256_expand_key_(
AES_AES_Block key_lo,
AES_AES_Block key_hi,
AES_AES256_RoundKeys* encryption_keys)
{
AES_AES_Block prev_lo, prev_hi;
AES_AES_Block hwgen;
prev_lo = encryption_keys->keys[0] = key_lo;
prev_hi = encryption_keys->keys[1] = key_hi;
hwgen = _mm_aeskeygenassist_si128(prev_hi, 0x01);
hwgen = _mm_shuffle_epi32(hwgen, 0xff);
encryption_keys->keys[2] = aes_aes256_expand_key_assist(&prev_lo, &prev_hi, hwgen);
hwgen = _mm_aeskeygenassist_si128(prev_hi, 0);
hwgen = _mm_shuffle_epi32(hwgen, 0xaa);
encryption_keys->keys[3] = aes_aes256_expand_key_assist(&prev_lo, &prev_hi, hwgen);
hwgen = _mm_aeskeygenassist_si128(prev_hi, 0x02);
hwgen = _mm_shuffle_epi32(hwgen, 0xff);
encryption_keys->keys[4] = aes_aes256_expand_key_assist(&prev_lo, &prev_hi, hwgen);
hwgen = _mm_aeskeygenassist_si128(prev_hi, 0);
hwgen = _mm_shuffle_epi32(hwgen, 0xaa);
encryption_keys->keys[5] = aes_aes256_expand_key_assist(&prev_lo, &prev_hi, hwgen);
hwgen = _mm_aeskeygenassist_si128(prev_hi, 0x04);
hwgen = _mm_shuffle_epi32(hwgen, 0xff);
encryption_keys->keys[6] = aes_aes256_expand_key_assist(&prev_lo, &prev_hi, hwgen);
hwgen = _mm_aeskeygenassist_si128(prev_hi, 0);
hwgen = _mm_shuffle_epi32(hwgen, 0xaa);
encryption_keys->keys[7] = aes_aes256_expand_key_assist(&prev_lo, &prev_hi, hwgen);
hwgen = _mm_aeskeygenassist_si128(prev_hi, 0x08);
hwgen = _mm_shuffle_epi32(hwgen, 0xff);
encryption_keys->keys[8] = aes_aes256_expand_key_assist(&prev_lo, &prev_hi, hwgen);
hwgen = _mm_aeskeygenassist_si128(prev_hi, 0);
hwgen = _mm_shuffle_epi32(hwgen, 0xaa);
encryption_keys->keys[9] = aes_aes256_expand_key_assist(&prev_lo, &prev_hi, hwgen);
hwgen = _mm_aeskeygenassist_si128(prev_hi, 0x10);
hwgen = _mm_shuffle_epi32(hwgen, 0xff);
encryption_keys->keys[10] = aes_aes256_expand_key_assist(&prev_lo, &prev_hi, hwgen);
hwgen = _mm_aeskeygenassist_si128(prev_hi, 0);
hwgen = _mm_shuffle_epi32(hwgen, 0xaa);
encryption_keys->keys[11] = aes_aes256_expand_key_assist(&prev_lo, &prev_hi, hwgen);
hwgen = _mm_aeskeygenassist_si128(prev_hi, 0x20);
hwgen = _mm_shuffle_epi32(hwgen, 0xff);
encryption_keys->keys[12] = aes_aes256_expand_key_assist(&prev_lo, &prev_hi, hwgen);
hwgen = _mm_aeskeygenassist_si128(prev_hi, 0);
hwgen = _mm_shuffle_epi32(hwgen, 0xaa);
encryption_keys->keys[13] = aes_aes256_expand_key_assist(&prev_lo, &prev_hi, hwgen);
hwgen = _mm_aeskeygenassist_si128(prev_hi, 0x40);
hwgen = _mm_shuffle_epi32(hwgen, 0xff);
encryption_keys->keys[14] = aes_aes256_expand_key_assist(&prev_lo, &prev_hi, hwgen);
}
void __fastcall aes_AES256_derive_decryption_keys_(
const AES_AES256_RoundKeys* encryption_keys,
AES_AES256_RoundKeys* decryption_keys)
{
decryption_keys->keys[0] = encryption_keys->keys[14];
decryption_keys->keys[1] = _mm_aesimc_si128(encryption_keys->keys[13]);
decryption_keys->keys[2] = _mm_aesimc_si128(encryption_keys->keys[12]);
decryption_keys->keys[3] = _mm_aesimc_si128(encryption_keys->keys[11]);
decryption_keys->keys[4] = _mm_aesimc_si128(encryption_keys->keys[10]);
decryption_keys->keys[5] = _mm_aesimc_si128(encryption_keys->keys[9]);
decryption_keys->keys[6] = _mm_aesimc_si128(encryption_keys->keys[8]);
decryption_keys->keys[7] = _mm_aesimc_si128(encryption_keys->keys[7]);
decryption_keys->keys[8] = _mm_aesimc_si128(encryption_keys->keys[6]);
decryption_keys->keys[9] = _mm_aesimc_si128(encryption_keys->keys[5]);
decryption_keys->keys[10] = _mm_aesimc_si128(encryption_keys->keys[4]);
decryption_keys->keys[11] = _mm_aesimc_si128(encryption_keys->keys[3]);
decryption_keys->keys[12] = _mm_aesimc_si128(encryption_keys->keys[2]);
decryption_keys->keys[13] = _mm_aesimc_si128(encryption_keys->keys[1]);
decryption_keys->keys[14] = encryption_keys->keys[0];
}
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