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AES.hpp
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AES.hpp
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#ifndef MRDCVLSC_AES_IMPLEMENTATION
#define MRDCVLSC_AES_IMPLEMENTATION
#include <iostream>
#if defined(USE_NEON_AES)
#ifndef HARDWARE_ACCELERATION_ARM_NEON_AES
#define HARDWARE_ACCELERATION_ARM_NEON_AES
#endif
#undef HARDWARE_ACCELERATION_INTEL_AESNI
#undef PORTABLE_CPP_CODE
#elif defined(USE_INTEL_AESNI)
#ifndef HARDWARE_ACCELERATION_INTEL_AESNI
#define HARDWARE_ACCELERATION_INTEL_AESNI
#endif
#undef HARDWARE_ACCELERATION_ARM_NEON_AES
#undef PORTABLE_CPP_CODE
#elif defined(USE_CXX_AES)
#ifndef PORTABLE_CPP_CODE
#define PORTABLE_CPP_CODE
#endif
#undef HARDWARE_ACCELERATION_INTEL_AESNI
#undef HARDWARE_ACCELERATION_ARM_NEON_AES
#else
#warning AES Implementation Not Specified
#warning Auto Detecting AES Implementation
#endif
#if (defined(_WIN32) || defined(_WIN64) || defined(__x86_64) || defined(__x86_64__) || defined(__amd64) || defined(__amd64__)) && \
!defined(USE_CXX_AES) && !defined(USE_NEON_AES)
#ifdef _MSC_VER
#include <intrin.h>
#endif
#include <emmintrin.h>
#include <immintrin.h>
#include <xmmintrin.h>
#ifndef HARDWARE_ACCELERATION_INTEL_AESNI
#define HARDWARE_ACCELERATION_INTEL_AESNI
#endif
#elif (defined(__arm64__) || defined(__aarch64__) || defined(_M_ARM)) && !defined(USE_CXX_AES) && \
!defined(USE_INTEL_AESNI)
#if defined(__GNUC__)
#include <stdint.h>
#endif
#if defined(__ARM_NEON) || defined(_MSC_VER)
#include <arm_neon.h>
#endif
/* GCC and LLVM Clang, but not Apple Clang */
#if defined(__GNUC__) && !defined(__apple_build_version__)
#if defined(__ARM_ACLE) || defined(__ARM_FEATURE_CRYPTO)
#include <arm_acle.h>
#endif
#endif
#ifndef HARDWARE_ACCELERATION_ARM_NEON_AES
#define HARDWARE_ACCELERATION_ARM_NEON_AES
#endif
#else
#ifndef PORTABLE_CPP_CODE
#define PORTABLE_CPP_CODE
#endif
#endif
#include <cstring>
#include <exception>
#include <iostream>
namespace Cipher {
template <size_t key_bits = 128>
class Aes {
static constexpr size_t AES_BLOCK = 16;
static constexpr size_t Nb = 4;
static constexpr size_t Nk = key_bits / 32;
static constexpr size_t Nr = Nk + 6;
static constexpr size_t round_keys_size = 4 * Nb * (Nr + 1);
unsigned char round_keys[round_keys_size];
#ifdef HARDWARE_ACCELERATION_INTEL_AESNI
inline __m128i AES_128_ASSIST(__m128i tmp1, __m128i tmp2) {
__m128i tmp3;
tmp2 = _mm_shuffle_epi32(tmp2, 0xff);
tmp3 = _mm_slli_si128(tmp1, 0x4);
tmp1 = _mm_xor_si128(tmp1, tmp3);
tmp3 = _mm_slli_si128(tmp3, 0x4);
tmp1 = _mm_xor_si128(tmp1, tmp3);
tmp3 = _mm_slli_si128(tmp3, 0x4);
tmp1 = _mm_xor_si128(tmp1, tmp3);
tmp1 = _mm_xor_si128(tmp1, tmp2);
return tmp1;
}
void AES_128_Key_Expansion(const unsigned char *user_key, unsigned char *key) {
__m128i tmp1, tmp2;
__m128i *key_sched = (__m128i *) key;
tmp1 = _mm_loadu_si128((__m128i *) user_key);
key_sched[0] = tmp1;
tmp2 = _mm_aeskeygenassist_si128(tmp1, 0x1);
tmp1 = AES_128_ASSIST(tmp1, tmp2);
key_sched[1] = tmp1;
tmp2 = _mm_aeskeygenassist_si128(tmp1, 0x2);
tmp1 = AES_128_ASSIST(tmp1, tmp2);
key_sched[2] = tmp1;
tmp2 = _mm_aeskeygenassist_si128(tmp1, 0x4);
tmp1 = AES_128_ASSIST(tmp1, tmp2);
key_sched[3] = tmp1;
tmp2 = _mm_aeskeygenassist_si128(tmp1, 0x8);
tmp1 = AES_128_ASSIST(tmp1, tmp2);
key_sched[4] = tmp1;
tmp2 = _mm_aeskeygenassist_si128(tmp1, 0x10);
tmp1 = AES_128_ASSIST(tmp1, tmp2);
key_sched[5] = tmp1;
tmp2 = _mm_aeskeygenassist_si128(tmp1, 0x20);
tmp1 = AES_128_ASSIST(tmp1, tmp2);
key_sched[6] = tmp1;
tmp2 = _mm_aeskeygenassist_si128(tmp1, 0x40);
tmp1 = AES_128_ASSIST(tmp1, tmp2);
key_sched[7] = tmp1;
tmp2 = _mm_aeskeygenassist_si128(tmp1, 0x80);
tmp1 = AES_128_ASSIST(tmp1, tmp2);
key_sched[8] = tmp1;
tmp2 = _mm_aeskeygenassist_si128(tmp1, 0x1b);
tmp1 = AES_128_ASSIST(tmp1, tmp2);
key_sched[9] = tmp1;
tmp2 = _mm_aeskeygenassist_si128(tmp1, 0x36);
tmp1 = AES_128_ASSIST(tmp1, tmp2);
key_sched[10] = tmp1;
}
inline void KEY_192_ASSIST(__m128i *tmp1, __m128i *tmp2, __m128i *tmp3) {
__m128i tmp4;
*tmp2 = _mm_shuffle_epi32(*tmp2, 0x55);
tmp4 = _mm_slli_si128(*tmp1, 0x4);
*tmp1 = _mm_xor_si128(*tmp1, tmp4);
tmp4 = _mm_slli_si128(tmp4, 0x4);
*tmp1 = _mm_xor_si128(*tmp1, tmp4);
tmp4 = _mm_slli_si128(tmp4, 0x4);
*tmp1 = _mm_xor_si128(*tmp1, tmp4);
*tmp1 = _mm_xor_si128(*tmp1, *tmp2);
*tmp2 = _mm_shuffle_epi32(*tmp1, 0xff);
tmp4 = _mm_slli_si128(*tmp3, 0x4);
*tmp3 = _mm_xor_si128(*tmp3, tmp4);
*tmp3 = _mm_xor_si128(*tmp3, *tmp2);
}
void AES_192_Key_Expansion(const unsigned char *user_key, unsigned char *key) {
__m128i tmp1, tmp2, tmp3;
__m128i *key_sched = (__m128i *) key;
tmp1 = _mm_loadu_si128((__m128i *) user_key);
tmp3 = _mm_loadu_si128((__m128i *) (user_key + 16));
key_sched[0] = tmp1;
key_sched[1] = tmp3;
tmp2 = _mm_aeskeygenassist_si128(tmp3, 0x1);
KEY_192_ASSIST(&tmp1, &tmp2, &tmp3);
key_sched[1] = _mm_castpd_si128(_mm_shuffle_pd(_mm_castsi128_pd(key_sched[1]), _mm_castsi128_pd(tmp1), 0));
key_sched[2] = _mm_castpd_si128(_mm_shuffle_pd(_mm_castsi128_pd(tmp1), _mm_castsi128_pd(tmp3), 1));
tmp2 = _mm_aeskeygenassist_si128(tmp3, 0x2);
KEY_192_ASSIST(&tmp1, &tmp2, &tmp3);
key_sched[3] = tmp1;
key_sched[4] = tmp3;
tmp2 = _mm_aeskeygenassist_si128(tmp3, 0x4);
KEY_192_ASSIST(&tmp1, &tmp2, &tmp3);
key_sched[4] = _mm_castpd_si128(_mm_shuffle_pd(_mm_castsi128_pd(key_sched[4]), _mm_castsi128_pd(tmp1), 0));
key_sched[5] = _mm_castpd_si128(_mm_shuffle_pd(_mm_castsi128_pd(tmp1), _mm_castsi128_pd(tmp3), 1));
tmp2 = _mm_aeskeygenassist_si128(tmp3, 0x8);
KEY_192_ASSIST(&tmp1, &tmp2, &tmp3);
key_sched[6] = tmp1;
key_sched[7] = tmp3;
tmp2 = _mm_aeskeygenassist_si128(tmp3, 0x10);
KEY_192_ASSIST(&tmp1, &tmp2, &tmp3);
key_sched[7] = _mm_castpd_si128(_mm_shuffle_pd(_mm_castsi128_pd(key_sched[7]), _mm_castsi128_pd(tmp1), 0));
key_sched[8] = _mm_castpd_si128(_mm_shuffle_pd(_mm_castsi128_pd(tmp1), _mm_castsi128_pd(tmp3), 1));
tmp2 = _mm_aeskeygenassist_si128(tmp3, 0x20);
KEY_192_ASSIST(&tmp1, &tmp2, &tmp3);
key_sched[9] = tmp1;
key_sched[10] = tmp3;
tmp2 = _mm_aeskeygenassist_si128(tmp3, 0x40);
KEY_192_ASSIST(&tmp1, &tmp2, &tmp3);
key_sched[10] = _mm_castpd_si128(_mm_shuffle_pd(_mm_castsi128_pd(key_sched[10]), _mm_castsi128_pd(tmp1), 0));
key_sched[11] = _mm_castpd_si128(_mm_shuffle_pd(_mm_castsi128_pd(tmp1), _mm_castsi128_pd(tmp3), 1));
tmp2 = _mm_aeskeygenassist_si128(tmp3, 0x80);
KEY_192_ASSIST(&tmp1, &tmp2, &tmp3);
key_sched[12] = tmp1;
}
inline void KEY_256_ASSIST_1(__m128i *tmp1, __m128i *tmp2) {
__m128i tmp4;
*tmp2 = _mm_shuffle_epi32(*tmp2, 0xff);
tmp4 = _mm_slli_si128(*tmp1, 0x4);
*tmp1 = _mm_xor_si128(*tmp1, tmp4);
tmp4 = _mm_slli_si128(tmp4, 0x4);
*tmp1 = _mm_xor_si128(*tmp1, tmp4);
tmp4 = _mm_slli_si128(tmp4, 0x4);
*tmp1 = _mm_xor_si128(*tmp1, tmp4);
*tmp1 = _mm_xor_si128(*tmp1, *tmp2);
}
inline void KEY_256_ASSIST_2(__m128i *tmp1, __m128i *tmp3) {
__m128i tmp2, tmp4;
tmp4 = _mm_aeskeygenassist_si128(*tmp1, 0x0);
tmp2 = _mm_shuffle_epi32(tmp4, 0xaa);
tmp4 = _mm_slli_si128(*tmp3, 0x4);
*tmp3 = _mm_xor_si128(*tmp3, tmp4);
tmp4 = _mm_slli_si128(tmp4, 0x4);
*tmp3 = _mm_xor_si128(*tmp3, tmp4);
tmp4 = _mm_slli_si128(tmp4, 0x4);
*tmp3 = _mm_xor_si128(*tmp3, tmp4);
*tmp3 = _mm_xor_si128(*tmp3, tmp2);
}
void AES_256_Key_Expansion(const unsigned char *user_key, unsigned char *key) {
__m128i tmp1, tmp2, tmp3;
__m128i *key_sched = (__m128i *) key;
tmp1 = _mm_loadu_si128((__m128i *) user_key);
tmp3 = _mm_loadu_si128((__m128i *) (user_key + 16));
key_sched[0] = tmp1;
key_sched[1] = tmp3;
tmp2 = _mm_aeskeygenassist_si128(tmp3, 0x01);
KEY_256_ASSIST_1(&tmp1, &tmp2);
key_sched[2] = tmp1;
KEY_256_ASSIST_2(&tmp1, &tmp3);
key_sched[3] = tmp3;
tmp2 = _mm_aeskeygenassist_si128(tmp3, 0x02);
KEY_256_ASSIST_1(&tmp1, &tmp2);
key_sched[4] = tmp1;
KEY_256_ASSIST_2(&tmp1, &tmp3);
key_sched[5] = tmp3;
tmp2 = _mm_aeskeygenassist_si128(tmp3, 0x04);
KEY_256_ASSIST_1(&tmp1, &tmp2);
key_sched[6] = tmp1;
KEY_256_ASSIST_2(&tmp1, &tmp3);
key_sched[7] = tmp3;
tmp2 = _mm_aeskeygenassist_si128(tmp3, 0x08);
KEY_256_ASSIST_1(&tmp1, &tmp2);
key_sched[8] = tmp1;
KEY_256_ASSIST_2(&tmp1, &tmp3);
key_sched[9] = tmp3;
tmp2 = _mm_aeskeygenassist_si128(tmp3, 0x10);
KEY_256_ASSIST_1(&tmp1, &tmp2);
key_sched[10] = tmp1;
KEY_256_ASSIST_2(&tmp1, &tmp3);
key_sched[11] = tmp3;
tmp2 = _mm_aeskeygenassist_si128(tmp3, 0x20);
KEY_256_ASSIST_1(&tmp1, &tmp2);
key_sched[12] = tmp1;
KEY_256_ASSIST_2(&tmp1, &tmp3);
key_sched[13] = tmp3;
tmp2 = _mm_aeskeygenassist_si128(tmp3, 0x40);
KEY_256_ASSIST_1(&tmp1, &tmp2);
key_sched[14] = tmp1;
}
// #elif defined(HARDWARE_ACCELERATION_ARM_NEON_AES)
// space for arm neon variables in case needed in the future.
#else
static constexpr unsigned char sbox[256] = {
0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76, 0xca, 0x82, 0xc9,
0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0, 0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f,
0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15, 0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07,
0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75, 0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3,
0x29, 0xe3, 0x2f, 0x84, 0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58,
0xcf, 0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8, 0x51, 0xa3,
0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2, 0xcd, 0x0c, 0x13, 0xec, 0x5f,
0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73, 0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88,
0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb, 0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac,
0x62, 0x91, 0x95, 0xe4, 0x79, 0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a,
0xae, 0x08, 0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a, 0x70,
0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e, 0xe1, 0xf8, 0x98, 0x11,
0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf, 0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42,
0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16,
};
static constexpr unsigned char inverse_sbox[256] = {
0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb, 0x7c, 0xe3, 0x39,
0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb, 0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2,
0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e, 0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76,
0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25, 0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc,
0x5d, 0x65, 0xb6, 0x92, 0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d,
0x84, 0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06, 0xd0, 0x2c,
0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b, 0x3a, 0x91, 0x11, 0x41, 0x4f,
0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73, 0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85,
0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e, 0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62,
0x0e, 0xaa, 0x18, 0xbe, 0x1b, 0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd,
0x5a, 0xf4, 0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f, 0x60,
0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef, 0xa0, 0xe0, 0x3b, 0x4d,
0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61, 0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6,
0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d,
};
/// Galois Multiplication lookup tables.
static constexpr unsigned char gf[15][256] = {
{},
{},
// mul 2
{
0x00, 0x02, 0x04, 0x06, 0x08, 0x0a, 0x0c, 0x0e, 0x10, 0x12, 0x14, 0x16, 0x18, 0x1a, 0x1c, 0x1e, 0x20, 0x22,
0x24, 0x26, 0x28, 0x2a, 0x2c, 0x2e, 0x30, 0x32, 0x34, 0x36, 0x38, 0x3a, 0x3c, 0x3e, 0x40, 0x42, 0x44, 0x46,
0x48, 0x4a, 0x4c, 0x4e, 0x50, 0x52, 0x54, 0x56, 0x58, 0x5a, 0x5c, 0x5e, 0x60, 0x62, 0x64, 0x66, 0x68, 0x6a,
0x6c, 0x6e, 0x70, 0x72, 0x74, 0x76, 0x78, 0x7a, 0x7c, 0x7e, 0x80, 0x82, 0x84, 0x86, 0x88, 0x8a, 0x8c, 0x8e,
0x90, 0x92, 0x94, 0x96, 0x98, 0x9a, 0x9c, 0x9e, 0xa0, 0xa2, 0xa4, 0xa6, 0xa8, 0xaa, 0xac, 0xae, 0xb0, 0xb2,
0xb4, 0xb6, 0xb8, 0xba, 0xbc, 0xbe, 0xc0, 0xc2, 0xc4, 0xc6, 0xc8, 0xca, 0xcc, 0xce, 0xd0, 0xd2, 0xd4, 0xd6,
0xd8, 0xda, 0xdc, 0xde, 0xe0, 0xe2, 0xe4, 0xe6, 0xe8, 0xea, 0xec, 0xee, 0xf0, 0xf2, 0xf4, 0xf6, 0xf8, 0xfa,
0xfc, 0xfe, 0x1b, 0x19, 0x1f, 0x1d, 0x13, 0x11, 0x17, 0x15, 0x0b, 0x09, 0x0f, 0x0d, 0x03, 0x01, 0x07, 0x05,
0x3b, 0x39, 0x3f, 0x3d, 0x33, 0x31, 0x37, 0x35, 0x2b, 0x29, 0x2f, 0x2d, 0x23, 0x21, 0x27, 0x25, 0x5b, 0x59,
0x5f, 0x5d, 0x53, 0x51, 0x57, 0x55, 0x4b, 0x49, 0x4f, 0x4d, 0x43, 0x41, 0x47, 0x45, 0x7b, 0x79, 0x7f, 0x7d,
0x73, 0x71, 0x77, 0x75, 0x6b, 0x69, 0x6f, 0x6d, 0x63, 0x61, 0x67, 0x65, 0x9b, 0x99, 0x9f, 0x9d, 0x93, 0x91,
0x97, 0x95, 0x8b, 0x89, 0x8f, 0x8d, 0x83, 0x81, 0x87, 0x85, 0xbb, 0xb9, 0xbf, 0xbd, 0xb3, 0xb1, 0xb7, 0xb5,
0xab, 0xa9, 0xaf, 0xad, 0xa3, 0xa1, 0xa7, 0xa5, 0xdb, 0xd9, 0xdf, 0xdd, 0xd3, 0xd1, 0xd7, 0xd5, 0xcb, 0xc9,
0xcf, 0xcd, 0xc3, 0xc1, 0xc7, 0xc5, 0xfb, 0xf9, 0xff, 0xfd, 0xf3, 0xf1, 0xf7, 0xf5, 0xeb, 0xe9, 0xef, 0xed,
0xe3, 0xe1, 0xe7, 0xe5,
},
// mul 3
{
0x00, 0x03, 0x06, 0x05, 0x0c, 0x0f, 0x0a, 0x09, 0x18, 0x1b, 0x1e, 0x1d, 0x14, 0x17, 0x12, 0x11, 0x30, 0x33,
0x36, 0x35, 0x3c, 0x3f, 0x3a, 0x39, 0x28, 0x2b, 0x2e, 0x2d, 0x24, 0x27, 0x22, 0x21, 0x60, 0x63, 0x66, 0x65,
0x6c, 0x6f, 0x6a, 0x69, 0x78, 0x7b, 0x7e, 0x7d, 0x74, 0x77, 0x72, 0x71, 0x50, 0x53, 0x56, 0x55, 0x5c, 0x5f,
0x5a, 0x59, 0x48, 0x4b, 0x4e, 0x4d, 0x44, 0x47, 0x42, 0x41, 0xc0, 0xc3, 0xc6, 0xc5, 0xcc, 0xcf, 0xca, 0xc9,
0xd8, 0xdb, 0xde, 0xdd, 0xd4, 0xd7, 0xd2, 0xd1, 0xf0, 0xf3, 0xf6, 0xf5, 0xfc, 0xff, 0xfa, 0xf9, 0xe8, 0xeb,
0xee, 0xed, 0xe4, 0xe7, 0xe2, 0xe1, 0xa0, 0xa3, 0xa6, 0xa5, 0xac, 0xaf, 0xaa, 0xa9, 0xb8, 0xbb, 0xbe, 0xbd,
0xb4, 0xb7, 0xb2, 0xb1, 0x90, 0x93, 0x96, 0x95, 0x9c, 0x9f, 0x9a, 0x99, 0x88, 0x8b, 0x8e, 0x8d, 0x84, 0x87,
0x82, 0x81, 0x9b, 0x98, 0x9d, 0x9e, 0x97, 0x94, 0x91, 0x92, 0x83, 0x80, 0x85, 0x86, 0x8f, 0x8c, 0x89, 0x8a,
0xab, 0xa8, 0xad, 0xae, 0xa7, 0xa4, 0xa1, 0xa2, 0xb3, 0xb0, 0xb5, 0xb6, 0xbf, 0xbc, 0xb9, 0xba, 0xfb, 0xf8,
0xfd, 0xfe, 0xf7, 0xf4, 0xf1, 0xf2, 0xe3, 0xe0, 0xe5, 0xe6, 0xef, 0xec, 0xe9, 0xea, 0xcb, 0xc8, 0xcd, 0xce,
0xc7, 0xc4, 0xc1, 0xc2, 0xd3, 0xd0, 0xd5, 0xd6, 0xdf, 0xdc, 0xd9, 0xda, 0x5b, 0x58, 0x5d, 0x5e, 0x57, 0x54,
0x51, 0x52, 0x43, 0x40, 0x45, 0x46, 0x4f, 0x4c, 0x49, 0x4a, 0x6b, 0x68, 0x6d, 0x6e, 0x67, 0x64, 0x61, 0x62,
0x73, 0x70, 0x75, 0x76, 0x7f, 0x7c, 0x79, 0x7a, 0x3b, 0x38, 0x3d, 0x3e, 0x37, 0x34, 0x31, 0x32, 0x23, 0x20,
0x25, 0x26, 0x2f, 0x2c, 0x29, 0x2a, 0x0b, 0x08, 0x0d, 0x0e, 0x07, 0x04, 0x01, 0x02, 0x13, 0x10, 0x15, 0x16,
0x1f, 0x1c, 0x19, 0x1a,
},
{},
{},
{},
{},
{},
// mul 9
{
0x00, 0x09, 0x12, 0x1b, 0x24, 0x2d, 0x36, 0x3f, 0x48, 0x41, 0x5a, 0x53, 0x6c, 0x65, 0x7e, 0x77, 0x90, 0x99,
0x82, 0x8b, 0xb4, 0xbd, 0xa6, 0xaf, 0xd8, 0xd1, 0xca, 0xc3, 0xfc, 0xf5, 0xee, 0xe7, 0x3b, 0x32, 0x29, 0x20,
0x1f, 0x16, 0x0d, 0x04, 0x73, 0x7a, 0x61, 0x68, 0x57, 0x5e, 0x45, 0x4c, 0xab, 0xa2, 0xb9, 0xb0, 0x8f, 0x86,
0x9d, 0x94, 0xe3, 0xea, 0xf1, 0xf8, 0xc7, 0xce, 0xd5, 0xdc, 0x76, 0x7f, 0x64, 0x6d, 0x52, 0x5b, 0x40, 0x49,
0x3e, 0x37, 0x2c, 0x25, 0x1a, 0x13, 0x08, 0x01, 0xe6, 0xef, 0xf4, 0xfd, 0xc2, 0xcb, 0xd0, 0xd9, 0xae, 0xa7,
0xbc, 0xb5, 0x8a, 0x83, 0x98, 0x91, 0x4d, 0x44, 0x5f, 0x56, 0x69, 0x60, 0x7b, 0x72, 0x05, 0x0c, 0x17, 0x1e,
0x21, 0x28, 0x33, 0x3a, 0xdd, 0xd4, 0xcf, 0xc6, 0xf9, 0xf0, 0xeb, 0xe2, 0x95, 0x9c, 0x87, 0x8e, 0xb1, 0xb8,
0xa3, 0xaa, 0xec, 0xe5, 0xfe, 0xf7, 0xc8, 0xc1, 0xda, 0xd3, 0xa4, 0xad, 0xb6, 0xbf, 0x80, 0x89, 0x92, 0x9b,
0x7c, 0x75, 0x6e, 0x67, 0x58, 0x51, 0x4a, 0x43, 0x34, 0x3d, 0x26, 0x2f, 0x10, 0x19, 0x02, 0x0b, 0xd7, 0xde,
0xc5, 0xcc, 0xf3, 0xfa, 0xe1, 0xe8, 0x9f, 0x96, 0x8d, 0x84, 0xbb, 0xb2, 0xa9, 0xa0, 0x47, 0x4e, 0x55, 0x5c,
0x63, 0x6a, 0x71, 0x78, 0x0f, 0x06, 0x1d, 0x14, 0x2b, 0x22, 0x39, 0x30, 0x9a, 0x93, 0x88, 0x81, 0xbe, 0xb7,
0xac, 0xa5, 0xd2, 0xdb, 0xc0, 0xc9, 0xf6, 0xff, 0xe4, 0xed, 0x0a, 0x03, 0x18, 0x11, 0x2e, 0x27, 0x3c, 0x35,
0x42, 0x4b, 0x50, 0x59, 0x66, 0x6f, 0x74, 0x7d, 0xa1, 0xa8, 0xb3, 0xba, 0x85, 0x8c, 0x97, 0x9e, 0xe9, 0xe0,
0xfb, 0xf2, 0xcd, 0xc4, 0xdf, 0xd6, 0x31, 0x38, 0x23, 0x2a, 0x15, 0x1c, 0x07, 0x0e, 0x79, 0x70, 0x6b, 0x62,
0x5d, 0x54, 0x4f, 0x46,
},
{},
// mul 11
{
0x00, 0x0b, 0x16, 0x1d, 0x2c, 0x27, 0x3a, 0x31, 0x58, 0x53, 0x4e, 0x45, 0x74, 0x7f, 0x62, 0x69, 0xb0, 0xbb,
0xa6, 0xad, 0x9c, 0x97, 0x8a, 0x81, 0xe8, 0xe3, 0xfe, 0xf5, 0xc4, 0xcf, 0xd2, 0xd9, 0x7b, 0x70, 0x6d, 0x66,
0x57, 0x5c, 0x41, 0x4a, 0x23, 0x28, 0x35, 0x3e, 0x0f, 0x04, 0x19, 0x12, 0xcb, 0xc0, 0xdd, 0xd6, 0xe7, 0xec,
0xf1, 0xfa, 0x93, 0x98, 0x85, 0x8e, 0xbf, 0xb4, 0xa9, 0xa2, 0xf6, 0xfd, 0xe0, 0xeb, 0xda, 0xd1, 0xcc, 0xc7,
0xae, 0xa5, 0xb8, 0xb3, 0x82, 0x89, 0x94, 0x9f, 0x46, 0x4d, 0x50, 0x5b, 0x6a, 0x61, 0x7c, 0x77, 0x1e, 0x15,
0x08, 0x03, 0x32, 0x39, 0x24, 0x2f, 0x8d, 0x86, 0x9b, 0x90, 0xa1, 0xaa, 0xb7, 0xbc, 0xd5, 0xde, 0xc3, 0xc8,
0xf9, 0xf2, 0xef, 0xe4, 0x3d, 0x36, 0x2b, 0x20, 0x11, 0x1a, 0x07, 0x0c, 0x65, 0x6e, 0x73, 0x78, 0x49, 0x42,
0x5f, 0x54, 0xf7, 0xfc, 0xe1, 0xea, 0xdb, 0xd0, 0xcd, 0xc6, 0xaf, 0xa4, 0xb9, 0xb2, 0x83, 0x88, 0x95, 0x9e,
0x47, 0x4c, 0x51, 0x5a, 0x6b, 0x60, 0x7d, 0x76, 0x1f, 0x14, 0x09, 0x02, 0x33, 0x38, 0x25, 0x2e, 0x8c, 0x87,
0x9a, 0x91, 0xa0, 0xab, 0xb6, 0xbd, 0xd4, 0xdf, 0xc2, 0xc9, 0xf8, 0xf3, 0xee, 0xe5, 0x3c, 0x37, 0x2a, 0x21,
0x10, 0x1b, 0x06, 0x0d, 0x64, 0x6f, 0x72, 0x79, 0x48, 0x43, 0x5e, 0x55, 0x01, 0x0a, 0x17, 0x1c, 0x2d, 0x26,
0x3b, 0x30, 0x59, 0x52, 0x4f, 0x44, 0x75, 0x7e, 0x63, 0x68, 0xb1, 0xba, 0xa7, 0xac, 0x9d, 0x96, 0x8b, 0x80,
0xe9, 0xe2, 0xff, 0xf4, 0xc5, 0xce, 0xd3, 0xd8, 0x7a, 0x71, 0x6c, 0x67, 0x56, 0x5d, 0x40, 0x4b, 0x22, 0x29,
0x34, 0x3f, 0x0e, 0x05, 0x18, 0x13, 0xca, 0xc1, 0xdc, 0xd7, 0xe6, 0xed, 0xf0, 0xfb, 0x92, 0x99, 0x84, 0x8f,
0xbe, 0xb5, 0xa8, 0xa3,
},
{},
// mul 13
{
0x00, 0x0d, 0x1a, 0x17, 0x34, 0x39, 0x2e, 0x23, 0x68, 0x65, 0x72, 0x7f, 0x5c, 0x51, 0x46, 0x4b, 0xd0, 0xdd,
0xca, 0xc7, 0xe4, 0xe9, 0xfe, 0xf3, 0xb8, 0xb5, 0xa2, 0xaf, 0x8c, 0x81, 0x96, 0x9b, 0xbb, 0xb6, 0xa1, 0xac,
0x8f, 0x82, 0x95, 0x98, 0xd3, 0xde, 0xc9, 0xc4, 0xe7, 0xea, 0xfd, 0xf0, 0x6b, 0x66, 0x71, 0x7c, 0x5f, 0x52,
0x45, 0x48, 0x03, 0x0e, 0x19, 0x14, 0x37, 0x3a, 0x2d, 0x20, 0x6d, 0x60, 0x77, 0x7a, 0x59, 0x54, 0x43, 0x4e,
0x05, 0x08, 0x1f, 0x12, 0x31, 0x3c, 0x2b, 0x26, 0xbd, 0xb0, 0xa7, 0xaa, 0x89, 0x84, 0x93, 0x9e, 0xd5, 0xd8,
0xcf, 0xc2, 0xe1, 0xec, 0xfb, 0xf6, 0xd6, 0xdb, 0xcc, 0xc1, 0xe2, 0xef, 0xf8, 0xf5, 0xbe, 0xb3, 0xa4, 0xa9,
0x8a, 0x87, 0x90, 0x9d, 0x06, 0x0b, 0x1c, 0x11, 0x32, 0x3f, 0x28, 0x25, 0x6e, 0x63, 0x74, 0x79, 0x5a, 0x57,
0x40, 0x4d, 0xda, 0xd7, 0xc0, 0xcd, 0xee, 0xe3, 0xf4, 0xf9, 0xb2, 0xbf, 0xa8, 0xa5, 0x86, 0x8b, 0x9c, 0x91,
0x0a, 0x07, 0x10, 0x1d, 0x3e, 0x33, 0x24, 0x29, 0x62, 0x6f, 0x78, 0x75, 0x56, 0x5b, 0x4c, 0x41, 0x61, 0x6c,
0x7b, 0x76, 0x55, 0x58, 0x4f, 0x42, 0x09, 0x04, 0x13, 0x1e, 0x3d, 0x30, 0x27, 0x2a, 0xb1, 0xbc, 0xab, 0xa6,
0x85, 0x88, 0x9f, 0x92, 0xd9, 0xd4, 0xc3, 0xce, 0xed, 0xe0, 0xf7, 0xfa, 0xb7, 0xba, 0xad, 0xa0, 0x83, 0x8e,
0x99, 0x94, 0xdf, 0xd2, 0xc5, 0xc8, 0xeb, 0xe6, 0xf1, 0xfc, 0x67, 0x6a, 0x7d, 0x70, 0x53, 0x5e, 0x49, 0x44,
0x0f, 0x02, 0x15, 0x18, 0x3b, 0x36, 0x21, 0x2c, 0x0c, 0x01, 0x16, 0x1b, 0x38, 0x35, 0x22, 0x2f, 0x64, 0x69,
0x7e, 0x73, 0x50, 0x5d, 0x4a, 0x47, 0xdc, 0xd1, 0xc6, 0xcb, 0xe8, 0xe5, 0xf2, 0xff, 0xb4, 0xb9, 0xae, 0xa3,
0x80, 0x8d, 0x9a, 0x97,
},
// mul 14
{
0x00, 0x0e, 0x1c, 0x12, 0x38, 0x36, 0x24, 0x2a, 0x70, 0x7e, 0x6c, 0x62, 0x48, 0x46, 0x54, 0x5a, 0xe0, 0xee,
0xfc, 0xf2, 0xd8, 0xd6, 0xc4, 0xca, 0x90, 0x9e, 0x8c, 0x82, 0xa8, 0xa6, 0xb4, 0xba, 0xdb, 0xd5, 0xc7, 0xc9,
0xe3, 0xed, 0xff, 0xf1, 0xab, 0xa5, 0xb7, 0xb9, 0x93, 0x9d, 0x8f, 0x81, 0x3b, 0x35, 0x27, 0x29, 0x03, 0x0d,
0x1f, 0x11, 0x4b, 0x45, 0x57, 0x59, 0x73, 0x7d, 0x6f, 0x61, 0xad, 0xa3, 0xb1, 0xbf, 0x95, 0x9b, 0x89, 0x87,
0xdd, 0xd3, 0xc1, 0xcf, 0xe5, 0xeb, 0xf9, 0xf7, 0x4d, 0x43, 0x51, 0x5f, 0x75, 0x7b, 0x69, 0x67, 0x3d, 0x33,
0x21, 0x2f, 0x05, 0x0b, 0x19, 0x17, 0x76, 0x78, 0x6a, 0x64, 0x4e, 0x40, 0x52, 0x5c, 0x06, 0x08, 0x1a, 0x14,
0x3e, 0x30, 0x22, 0x2c, 0x96, 0x98, 0x8a, 0x84, 0xae, 0xa0, 0xb2, 0xbc, 0xe6, 0xe8, 0xfa, 0xf4, 0xde, 0xd0,
0xc2, 0xcc, 0x41, 0x4f, 0x5d, 0x53, 0x79, 0x77, 0x65, 0x6b, 0x31, 0x3f, 0x2d, 0x23, 0x09, 0x07, 0x15, 0x1b,
0xa1, 0xaf, 0xbd, 0xb3, 0x99, 0x97, 0x85, 0x8b, 0xd1, 0xdf, 0xcd, 0xc3, 0xe9, 0xe7, 0xf5, 0xfb, 0x9a, 0x94,
0x86, 0x88, 0xa2, 0xac, 0xbe, 0xb0, 0xea, 0xe4, 0xf6, 0xf8, 0xd2, 0xdc, 0xce, 0xc0, 0x7a, 0x74, 0x66, 0x68,
0x42, 0x4c, 0x5e, 0x50, 0x0a, 0x04, 0x16, 0x18, 0x32, 0x3c, 0x2e, 0x20, 0xec, 0xe2, 0xf0, 0xfe, 0xd4, 0xda,
0xc8, 0xc6, 0x9c, 0x92, 0x80, 0x8e, 0xa4, 0xaa, 0xb8, 0xb6, 0x0c, 0x02, 0x10, 0x1e, 0x34, 0x3a, 0x28, 0x26,
0x7c, 0x72, 0x60, 0x6e, 0x44, 0x4a, 0x58, 0x56, 0x37, 0x39, 0x2b, 0x25, 0x0f, 0x01, 0x13, 0x1d, 0x47, 0x49,
0x5b, 0x55, 0x7f, 0x71, 0x63, 0x6d, 0xd7, 0xd9, 0xcb, 0xc5, 0xef, 0xe1, 0xf3, 0xfd, 0xa7, 0xa9, 0xbb, 0xb5,
0x9f, 0x91, 0x83, 0x8d,
},
};
/// circulant MDS matrix
static constexpr unsigned char cmds[4][4] = {
{2, 3, 1, 1},
{1, 2, 3, 1},
{1, 1, 2, 3},
{3, 1, 1, 2},
};
/// Inverse circulant MDS matrix
static constexpr unsigned char inverse_cmds[4][4] = {
{14, 11, 13, 9},
{9, 14, 11, 13},
{13, 9, 14, 11},
{11, 13, 9, 14},
};
void sub_bytes(unsigned char state[AES_BLOCK]) noexcept {
for (size_t i = 0; i < AES_BLOCK; i += 4) {
state[i] = sbox[state[i]];
state[i + 1] = sbox[state[i + 1]];
state[i + 2] = sbox[state[i + 2]];
state[i + 3] = sbox[state[i + 3]];
}
}
void inverse_sub_bytes(unsigned char state[AES_BLOCK]) noexcept {
for (size_t i = 0; i < AES_BLOCK; i += 4) {
state[i] = inverse_sbox[state[i]];
state[i + 1] = inverse_sbox[state[i + 1]];
state[i + 2] = inverse_sbox[state[i + 2]];
state[i + 3] = inverse_sbox[state[i + 3]];
}
}
void shift_rows(unsigned char state[AES_BLOCK]) noexcept {
unsigned char temp = state[4];
state[4] = state[5];
state[5] = state[6];
state[6] = state[7];
state[7] = temp;
temp = state[8];
state[8] = state[10];
state[10] = temp;
temp = state[9];
state[9] = state[11];
state[11] = temp;
temp = state[12];
state[12] = state[15];
state[15] = state[14];
state[14] = state[13];
state[13] = temp;
}
void inverse_shift_rows(unsigned char state[AES_BLOCK]) noexcept {
unsigned char temp = state[4];
state[4] = state[7];
state[7] = state[6];
state[6] = state[5];
state[5] = temp;
temp = state[8];
state[8] = state[10];
state[10] = temp;
temp = state[9];
state[9] = state[11];
state[11] = temp;
temp = state[12];
state[12] = state[13];
state[13] = state[14];
state[14] = state[15];
state[15] = temp;
}
void mix_columns(unsigned char state[AES_BLOCK]) noexcept {
unsigned char gf_product[AES_BLOCK] = {};
// TODO: analyse in the future if this loop can speed up by branchless programming.
for (size_t i = 0; i < 4; ++i) {
for (size_t k = 0; k < 4; ++k) {
gf_product[i * 4] ^= (cmds[i][k] == 1) ? state[k * 4] : gf[cmds[i][k]][state[k * 4]];
gf_product[i * 4 + 1] ^= (cmds[i][k] == 1) ? state[k * 4 + 1] : gf[cmds[i][k]][state[k * 4 + 1]];
gf_product[i * 4 + 2] ^= (cmds[i][k] == 1) ? state[k * 4 + 2] : gf[cmds[i][k]][state[k * 4 + 2]];
gf_product[i * 4 + 3] ^= (cmds[i][k] == 1) ? state[k * 4 + 3] : gf[cmds[i][k]][state[k * 4 + 3]];
}
}
for (size_t i = 0; i < AES_BLOCK; i += 4) {
state[i] = gf_product[i];
state[i + 1] = gf_product[i + 1];
state[i + 2] = gf_product[i + 2];
state[i + 3] = gf_product[i + 3];
}
}
void inverse_mix_columns(unsigned char state[AES_BLOCK]) noexcept {
unsigned char gf_product[AES_BLOCK] = {};
for (size_t i = 0; i < 4; ++i) {
for (size_t k = 0; k < 4; ++k) {
gf_product[i * 4] ^= gf[inverse_cmds[i][k]][state[k * 4]];
gf_product[i * 4 + 1] ^= gf[inverse_cmds[i][k]][state[k * 4 + 1]];
gf_product[i * 4 + 2] ^= gf[inverse_cmds[i][k]][state[k * 4 + 2]];
gf_product[i * 4 + 3] ^= gf[inverse_cmds[i][k]][state[k * 4 + 3]];
}
}
for (size_t i = 0; i < AES_BLOCK; i += 4) {
state[i] = gf_product[i];
state[i + 1] = gf_product[i + 1];
state[i + 2] = gf_product[i + 2];
state[i + 3] = gf_product[i + 3];
}
}
void add_round_key(unsigned char state[AES_BLOCK], unsigned char *key) noexcept {
for (size_t i = 0; i < 4; ++i) {
state[i * 4] ^= key[i];
state[i * 4 + 1] ^= key[i + 4];
state[i * 4 + 2] ^= key[i + 8];
state[i * 4 + 3] ^= key[i + 12];
}
}
void sub_dword(unsigned char *dword) noexcept {
dword[0] = sbox[dword[0]];
dword[1] = sbox[dword[1]];
dword[2] = sbox[dword[2]];
dword[3] = sbox[dword[3]];
}
void rot_dword(unsigned char *dword) noexcept {
unsigned char temp = dword[0];
dword[0] = dword[1];
dword[1] = dword[2];
dword[2] = dword[3];
dword[3] = temp;
}
void xor_dword(unsigned char *dest, unsigned char *a, unsigned char *b) noexcept {
dest[0] = a[0] ^ b[0];
dest[1] = a[1] ^ b[1];
dest[2] = a[2] ^ b[2];
dest[3] = a[3] ^ b[3];
}
void rcon_n(unsigned char *dword, size_t n) noexcept {
unsigned char cbyte = 0x01;
for (size_t i = 0; i < n - 1; ++i) {
cbyte = (cbyte << 1) ^ (((cbyte >> 7) & 1) * 0x1b);
}
dword[0] = cbyte;
dword[1] = dword[2] = dword[3] = 0x00;
}
#endif
void state_transpose(unsigned char *state) noexcept {
for (size_t i = 0; i < 4; i++) {
for (size_t j = 0; j < i; j++) {
std::swap(state[i * 4 + j], state[j * 4 + i]);
}
}
}
public:
#ifdef HARDWARE_ACCELERATION_INTEL_AESNI
static constexpr const char AES_TECHNOLOGY[] = "INTEL AES-NI";
#elif defined(HARDWARE_ACCELERATION_ARM_NEON_AES)
static constexpr const char AES_TECHNOLOGY[] = "ARM NEON AES";
#else
static constexpr const char AES_TECHNOLOGY[] = "Plain C++ AES";
#endif
/**
* @param key A `unsigned char *` array that contains the AES key.
* This key should either be **16, 24, 32** bytes, or `128`, `192`, `256` bits.
*/
Aes(unsigned char key[key_bits]) : round_keys() {
constexpr bool invalid_aes_key_bit_size = key_bits == 128 || key_bits == 192 || key_bits == 256;
static_assert(invalid_aes_key_bit_size, "The valid values are only: 128, 192 & 256");
#ifdef HARDWARE_ACCELERATION_INTEL_AESNI
if constexpr (key_bits == 128) {
AES_128_Key_Expansion(key, round_keys);
} else if constexpr (key_bits == 192) {
AES_192_Key_Expansion(key, round_keys);
} else if constexpr (key_bits == 256) {
AES_256_Key_Expansion(key, round_keys);
}
#elif defined(HARDWARE_ACCELERATION_ARM_NEON_AES)
// key expansion
unsigned char temp[4];
unsigned char rcon[4];
size_t i = 0;
while (i < Nk * 4) {
round_keys[i] = key[i];
round_keys[i + 1] = key[i + 1];
i += 2;
}
while (i < round_keys_size) {
temp[0] = round_keys[i - 4];
temp[1] = round_keys[i - 4 + 1];
temp[2] = round_keys[i - 4 + 2];
temp[3] = round_keys[i - 4 + 3];
if (i / 4 % Nk == 0) {
rot_dword(temp);
sub_dword(temp);
rcon_n(rcon, i / (Nk * 4));
xor_dword(temp, rcon, temp);
} else if (Nk > 6 && i / 4 % Nk == 4) {
sub_dword(temp);
}
round_keys[i + 0] = round_keys[i - 4 * Nk] ^ temp[0];
round_keys[i + 1] = round_keys[i + 1 - 4 * Nk] ^ temp[1];
round_keys[i + 2] = round_keys[i + 2 - 4 * Nk] ^ temp[2];
round_keys[i + 3] = round_keys[i + 3 - 4 * Nk] ^ temp[3];
i += 4;
}
#else
// key expansion
unsigned char temp[4];
unsigned char rcon[4];
size_t i = 0;
while (i < Nk * 4) {
round_keys[i] = key[i];
round_keys[i + 1] = key[i + 1];
i += 2;
}
while (i < round_keys_size) {
temp[0] = round_keys[i - 4];
temp[1] = round_keys[i - 4 + 1];
temp[2] = round_keys[i - 4 + 2];
temp[3] = round_keys[i - 4 + 3];
if (i / 4 % Nk == 0) {
rot_dword(temp);
sub_dword(temp);
rcon_n(rcon, i / (Nk * 4));
xor_dword(temp, rcon, temp);
} else if (Nk > 6 && i / 4 % Nk == 4) {
sub_dword(temp);
}
round_keys[i + 0] = round_keys[i - 4 * Nk] ^ temp[0];
round_keys[i + 1] = round_keys[i + 1 - 4 * Nk] ^ temp[1];
round_keys[i + 2] = round_keys[i + 2 - 4 * Nk] ^ temp[2];
round_keys[i + 3] = round_keys[i + 3 - 4 * Nk] ^ temp[3];
i += 4;
}
#endif
}
~Aes() {
std::memset(round_keys, 0x00, round_keys_size);
}
/// @brief Performs AES encryption to a 16 byte block of memory.
///
/// @note This method will overwrite the input block of memory.
///
/// @param block 16 byte block of memory.
void encrypt_block(unsigned char *block) {
#ifdef HARDWARE_ACCELERATION_INTEL_AESNI
// load the current block & current round key into the registers
__m128i *xmm_round_keys = (__m128i *) round_keys;
__m128i state = _mm_loadu_si128((__m128i *) &block[0]);
// original key
state = _mm_xor_si128(state, xmm_round_keys[0]);
// perform usual rounds
for (size_t i = 1; i < Nr - 1; i += 2) {
state = _mm_aesenc_si128(state, xmm_round_keys[i]);
state = _mm_aesenc_si128(state, xmm_round_keys[i + 1]);
}
// last round
state = _mm_aesenc_si128(state, xmm_round_keys[Nr - 1]);
state = _mm_aesenclast_si128(state, xmm_round_keys[Nr]);
// store from register to array
_mm_storeu_si128((__m128i *) (block), state);
#elif defined(HARDWARE_ACCELERATION_ARM_NEON_AES)
uint8x16_t *neon_round_keys = (uint8x16_t *) round_keys;
uint8x16_t state = vld1q_u8(block);
// Initial round
state = vaesmcq_u8(vaeseq_u8(state, neon_round_keys[0]));
// 8 main rounds
for (size_t i = 1; i < Nr - 1; i += 2) {
state = vaesmcq_u8(vaeseq_u8(state, neon_round_keys[i]));
state = vaesmcq_u8(vaeseq_u8(state, neon_round_keys[i + 1]));
}
// last 2 final round
state = vaeseq_u8(state, neon_round_keys[Nr - 1]);
state = veorq_u8(state, neon_round_keys[Nr]);
// store the result to block
vst1q_u8(block, state);
#else
state_transpose(block);
add_round_key(block, &round_keys[0]);
for (size_t round = 1; round <= Nr - 1; ++round) {
sub_bytes(block);
shift_rows(block);
mix_columns(block);
add_round_key(block, &round_keys[round * Nb * 4]);
}
sub_bytes(block);
shift_rows(block);
add_round_key(block, &round_keys[Nb * Nr * 4]);
state_transpose(block);
#endif
}
/// @brief Performs AES decryption to a 16 byte block of memory.
///
/// @note This method will overwrite the input block of memory.
///
/// @param block 16 byte block of memory.
void decrypt_block(unsigned char *block) {
#ifdef HARDWARE_ACCELERATION_INTEL_AESNI
// load the current block & current round key into the registers
__m128i *xmm_round_keys = (__m128i *) round_keys;
__m128i state = _mm_loadu_si128((__m128i *) &block[0]);
// first round
state = _mm_xor_si128(state, xmm_round_keys[Nr]);
// usual rounds
for (size_t i = Nr - 1; i > 1; i -= 2) {
state = _mm_aesdec_si128(state, _mm_aesimc_si128(xmm_round_keys[i]));
state = _mm_aesdec_si128(state, _mm_aesimc_si128(xmm_round_keys[i - 1]));
}
// last round
state = _mm_aesdec_si128(state, _mm_aesimc_si128(xmm_round_keys[1]));
state = _mm_aesdeclast_si128(state, xmm_round_keys[0]);
// store from register to array
_mm_storeu_si128((__m128i *) block, state);
#elif defined(HARDWARE_ACCELERATION_ARM_NEON_AES)
uint8x16_t *neon_round_keys = (uint8x16_t *) round_keys;
uint8x16_t state = vld1q_u8(block);
// Initial round
state = vaesimcq_u8(vaesdq_u8(state, neon_round_keys[Nr]));
// 8 main rounds
for (size_t i = Nr - 1; i > 1; i -= 2) {
state = vaesimcq_u8(vaesdq_u8(state, vaesimcq_u8(neon_round_keys[i])));
state = vaesimcq_u8(vaesdq_u8(state, vaesimcq_u8(neon_round_keys[i - 1])));
}
// final 2 rounds
state = vaesdq_u8(state, vaesimcq_u8(neon_round_keys[1]));
state = veorq_u8(state, neon_round_keys[0]);
// store the result to recover
vst1q_u8(block, state);
#else
state_transpose(block);
add_round_key(block, &round_keys[Nb * Nr * 4]);
for (size_t round = Nr - 1; round > 0; --round) {
inverse_sub_bytes(block);
inverse_shift_rows(block);
add_round_key(block, &round_keys[round * Nb * 4]);
inverse_mix_columns(block);
}
inverse_sub_bytes(block);
inverse_shift_rows(block);
add_round_key(block, &round_keys[0]);
state_transpose(block);
#endif
}
};
} // namespace Cipher
#endif