/**
 * (C) 2007-22 - ntop.org and contributors
 * Copyright (C) 2023-25 Hamish Coleman
 * SPDX-License-Identifier: GPL-3.0-only
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not see see <http://www.gnu.org/licenses/>
 *
 */

#include "config.h"     // for HAVE_LIBCRYPTO

#include <n3n/logging.h> // for traceEvent
#include <stdint.h>  // for uint32_t, uint8_t
#include <stdlib.h>  // for calloc, free
#include <string.h>  // for memcpy, size_t
#include "aes.h"     // for AES_BLOCK_SIZE, aes_context_t, AES128_KEY_BYTES
#include "portable_endian.h"  // for be32toh, htobe32


#ifdef HAVE_LIBCRYPTO // openSSL 1.1 ---------------------------------------------------------------------

#include <openssl/err.h>    // for ERR_print_errors
#include <openssl/evp.h>    // for EVP_EncryptInit_ex, EVP_CIPHER_CTX_set_p...

// get any erorr message out of openssl
// taken from https://en.wikibooks.org/wiki/OpenSSL/Error_handling
static char *openssl_err_as_string (void) {

    BIO *bio = BIO_new(BIO_s_mem());
    ERR_print_errors(bio);
    char *buf = NULL;
    size_t len = BIO_get_mem_data(bio, &buf);
    char *ret = (char *) calloc(1, 1 + len);

    if(ret)
        memcpy(ret, buf, len);

    BIO_free(bio);

    return ret;
}


int aes_cbc_encrypt (unsigned char *out, const unsigned char *in, size_t in_len,
                     const unsigned char *iv, aes_context_t *ctx) {

    int evp_len;
    int evp_ciphertext_len;

    if(1 == EVP_EncryptInit_ex(ctx->enc_ctx, ctx->cipher, NULL, ctx->key, iv)) {
        if(1 == EVP_CIPHER_CTX_set_padding(ctx->enc_ctx, 0)) {
            if(1 == EVP_EncryptUpdate(ctx->enc_ctx, out, &evp_len, in, in_len)) {
                evp_ciphertext_len = evp_len;
                if(1 == EVP_EncryptFinal_ex(ctx->enc_ctx, out + evp_len, &evp_len)) {
                    evp_ciphertext_len += evp_len;
                    if(evp_ciphertext_len != in_len)
                        traceEvent(TRACE_ERROR, "aes_cbc_encrypt openssl encryption: encrypted %u bytes where %u were expected",
                                   evp_ciphertext_len, in_len);
                } else
                    traceEvent(TRACE_ERROR, "aes_cbc_encrypt openssl final encryption: %s",
                               openssl_err_as_string());
            } else
                traceEvent(TRACE_ERROR, "aes_cbc_encrypt openssl encrpytion: %s",
                           openssl_err_as_string());
        } else
            traceEvent(TRACE_ERROR, "aes_cbc_encrypt openssl padding setup: %s",
                       openssl_err_as_string());
    } else
        traceEvent(TRACE_ERROR, "aes_cbc_encrypt openssl init: %s",
                   openssl_err_as_string());

    EVP_CIPHER_CTX_reset(ctx->enc_ctx);

    return 0;
}


int aes_cbc_decrypt (unsigned char *out, const unsigned char *in, size_t in_len,
                     const unsigned char *iv, aes_context_t *ctx) {

    int evp_len;
    int evp_plaintext_len;

    if(1 == EVP_DecryptInit_ex(ctx->dec_ctx, ctx->cipher, NULL, ctx->key, iv)) {
        if(1 == EVP_CIPHER_CTX_set_padding(ctx->dec_ctx, 0)) {
            if(1 == EVP_DecryptUpdate(ctx->dec_ctx, out, &evp_len, in, in_len)) {
                evp_plaintext_len = evp_len;
                if(1 == EVP_DecryptFinal_ex(ctx->dec_ctx, out + evp_len, &evp_len)) {
                    evp_plaintext_len += evp_len;
                    if(evp_plaintext_len != in_len)
                        traceEvent(TRACE_ERROR, "aes_cbc_decrypt openssl decryption: decrypted %u bytes where %u were expected",
                                   evp_plaintext_len, in_len);
                } else
                    traceEvent(TRACE_ERROR, "aes_cbc_decrypt openssl final decryption: %s",
                               openssl_err_as_string());
            } else
                traceEvent(TRACE_ERROR, "aes_cbc_decrypt openssl decrpytion: %s",
                           openssl_err_as_string());
        } else
            traceEvent(TRACE_ERROR, "aes_cbc_decrypt openssl padding setup: %s",
                       openssl_err_as_string());
    } else
        traceEvent(TRACE_ERROR, "aes_cbc_decrypt openssl init: %s",
                   openssl_err_as_string());

    EVP_CIPHER_CTX_reset(ctx->dec_ctx);

    return 0;
}


int aes_ecb_decrypt (unsigned char *out, const unsigned char *in, aes_context_t *ctx) {

    AES_ecb_encrypt(in, out, &(ctx->ecb_dec_key), AES_DECRYPT);

    return 0;
}


int aes_init (const unsigned char *key, size_t key_size, aes_context_t **ctx) {

    // allocate context...
    *ctx = (aes_context_t*) calloc(1, sizeof(aes_context_t));
    if(!(*ctx))
        return -1;

    // ...and fill her up:

    // initialize data structures
    if(!((*ctx)->enc_ctx = EVP_CIPHER_CTX_new())) {
        traceEvent(TRACE_ERROR, "aes_init openssl's evp_* encryption context creation failed: %s",
                   openssl_err_as_string());
        return -1;
    }

    if(!((*ctx)->dec_ctx = EVP_CIPHER_CTX_new())) {
        traceEvent(TRACE_ERROR, "aes_init openssl's evp_* decryption context creation failed: %s",
                   openssl_err_as_string());
        return -1;
    }

    // check key size and make key size (given in bytes) dependant settings
    switch(key_size) {
        case AES128_KEY_BYTES:    // 128 bit key size
            (*ctx)->cipher = EVP_aes_128_cbc();
            break;
        case AES192_KEY_BYTES:    // 192 bit key size
            (*ctx)->cipher = EVP_aes_192_cbc();
            break;
        case AES256_KEY_BYTES:    // 256 bit key size
            (*ctx)->cipher = EVP_aes_256_cbc();
            break;
        default:
            traceEvent(TRACE_ERROR, "aes_init invalid key size %u\n", key_size);
            return -1;
    }

    // key materiel handling
    memcpy((*ctx)->key, key, key_size);
    AES_set_decrypt_key(key, key_size * 8, &((*ctx)->ecb_dec_key));

    return 0;
}


#elif defined (__AES__) && defined (__SSE2__) // Intel's AES-NI ---------------------------------------------------


// inspired by https://gist.github.com/acapola/d5b940da024080dfaf5f
// furthered by the help of Sebastian Ramacher's implementation found at
// https://chromium.googlesource.com/external/github.com/dlitz/pycrypto/+/junk/master/src/AESNI.c
// modified along Intel's white paper on AES Instruction Set
// https://www.intel.com/content/dam/doc/white-paper/advanced-encryption-standard-new-instructions-set-paper.pdf


static __m128i aes128_keyexpand (__m128i key, __m128i keygened, uint8_t shuf) {

    key = _mm_xor_si128(key, _mm_slli_si128(key, 4));
    key = _mm_xor_si128(key, _mm_slli_si128(key, 4));
    key = _mm_xor_si128(key, _mm_slli_si128(key, 4));

    // unfortunately, shuffle expects immediate argument, thus the not-so-stylish switch ...
    // REVISIT: either macrorize this whole function (and perhaps the following one) or
    //          use shuffle_epi8 (which would require SSSE3 instead of SSE2)
    switch(shuf) {
        case 0x55:
            keygened = _mm_shuffle_epi32(keygened, 0x55 );
            break;
        case 0xaa:
            keygened = _mm_shuffle_epi32(keygened, 0xaa );
            break;
        case 0xff:
            keygened = _mm_shuffle_epi32(keygened, 0xff );
            break;
        default:
            break;
    }

    return _mm_xor_si128(key, keygened);
}


static __m128i aes192_keyexpand_2 (__m128i key, __m128i key2) {

    key = _mm_shuffle_epi32(key, 0xff);
    key2 = _mm_xor_si128(key2, _mm_slli_si128(key2, 4));

    return _mm_xor_si128(key, key2);
}


#define KEYEXP128(K, I)      aes128_keyexpand(K,  _mm_aeskeygenassist_si128(K,  I),    0xff)
#define KEYEXP192(K1, K2, I) aes128_keyexpand(K1, _mm_aeskeygenassist_si128(K2, I),    0x55)
#define KEYEXP192_2(K1, K2)  aes192_keyexpand_2(K1, K2)
#define KEYEXP256(K1, K2, I) aes128_keyexpand(K1, _mm_aeskeygenassist_si128(K2, I),    0xff)
#define KEYEXP256_2(K1, K2)  aes128_keyexpand(K1, _mm_aeskeygenassist_si128(K2, 0x00), 0xaa)


// key setup
static int aes_internal_key_setup (aes_context_t *ctx, const uint8_t *key, int key_bits) {

    // number of rounds
    ctx->Nr = 6 + (key_bits / 32);

    // encryption keys
    switch(key_bits) {
        case 128: {
            ctx->rk_enc[ 0] = _mm_loadu_si128((const __m128i*)key);
            ctx->rk_enc[ 1] = KEYEXP128(ctx->rk_enc[0], 0x01);
            ctx->rk_enc[ 2] = KEYEXP128(ctx->rk_enc[1], 0x02);
            ctx->rk_enc[ 3] = KEYEXP128(ctx->rk_enc[2], 0x04);
            ctx->rk_enc[ 4] = KEYEXP128(ctx->rk_enc[3], 0x08);
            ctx->rk_enc[ 5] = KEYEXP128(ctx->rk_enc[4], 0x10);
            ctx->rk_enc[ 6] = KEYEXP128(ctx->rk_enc[5], 0x20);
            ctx->rk_enc[ 7] = KEYEXP128(ctx->rk_enc[6], 0x40);
            ctx->rk_enc[ 8] = KEYEXP128(ctx->rk_enc[7], 0x80);
            ctx->rk_enc[ 9] = KEYEXP128(ctx->rk_enc[8], 0x1B);
            ctx->rk_enc[10] = KEYEXP128(ctx->rk_enc[9], 0x36);
            break;
        }
        case 192: {
            __m128i temp[2];
            ctx->rk_enc[ 0] = _mm_loadu_si128((const __m128i*) key);

            ctx->rk_enc[ 1] = _mm_loadu_si128((const __m128i*) (key+16));
            temp[0] = KEYEXP192(ctx->rk_enc[0], ctx->rk_enc[1], 0x01);
            temp[1] = KEYEXP192_2(temp[0], ctx->rk_enc[1]);
            ctx->rk_enc[ 1] = (__m128i)_mm_shuffle_pd((__m128d)ctx->rk_enc[1], (__m128d)temp[0], 0);

            ctx->rk_enc[ 2] = (__m128i)_mm_shuffle_pd((__m128d)temp[0], (__m128d)temp[1], 1);
            ctx->rk_enc[ 3] = KEYEXP192(temp[0], temp[1], 0x02);

            ctx->rk_enc[ 4] = KEYEXP192_2(ctx->rk_enc[3], temp[1]);
            temp[0] = KEYEXP192(ctx->rk_enc[3], ctx->rk_enc[4], 0x04);
            temp[1] = KEYEXP192_2(temp[0], ctx->rk_enc[4]);
            ctx->rk_enc[ 4] = (__m128i)_mm_shuffle_pd((__m128d)ctx->rk_enc[4], (__m128d)temp[0], 0);

            ctx->rk_enc[ 5] = (__m128i)_mm_shuffle_pd((__m128d)temp[0], (__m128d)temp[1], 1);
            ctx->rk_enc[ 6] = KEYEXP192(temp[0], temp[1], 0x08);

            ctx->rk_enc[ 7] = KEYEXP192_2(ctx->rk_enc[6], temp[1]);
            temp[0] = KEYEXP192(ctx->rk_enc[6], ctx->rk_enc[7], 0x10);
            temp[1] = KEYEXP192_2(temp[0], ctx->rk_enc[7]);
            ctx->rk_enc[ 7] = (__m128i)_mm_shuffle_pd((__m128d)ctx->rk_enc[7], (__m128d)temp[0], 0);

            ctx->rk_enc[ 8] = (__m128i)_mm_shuffle_pd((__m128d)temp[0], (__m128d)temp[1], 1);
            ctx->rk_enc[ 9] = KEYEXP192(temp[0], temp[1], 0x20);

            ctx->rk_enc[10] = KEYEXP192_2(ctx->rk_enc[9], temp[1]);
            temp[0] = KEYEXP192(ctx->rk_enc[9], ctx->rk_enc[10], 0x40);
            temp[1] = KEYEXP192_2(temp[0], ctx->rk_enc[10]);
            ctx->rk_enc[10] = (__m128i)_mm_shuffle_pd((__m128d)ctx->rk_enc[10], (__m128d) temp[0], 0);

            ctx->rk_enc[11] = (__m128i)_mm_shuffle_pd((__m128d)temp[0],(__m128d) temp[1], 1);
            ctx->rk_enc[12] = KEYEXP192(temp[0], temp[1], 0x80);
            break;
        }
        case 256: {
            ctx->rk_enc[ 0] = _mm_loadu_si128((const __m128i*) key);
            ctx->rk_enc[ 1] = _mm_loadu_si128((const __m128i*) (key+16));
            ctx->rk_enc[ 2] = KEYEXP256(ctx->rk_enc[0], ctx->rk_enc[1], 0x01);
            ctx->rk_enc[ 3] = KEYEXP256_2(ctx->rk_enc[1], ctx->rk_enc[2]);
            ctx->rk_enc[ 4] = KEYEXP256(ctx->rk_enc[2], ctx->rk_enc[3], 0x02);
            ctx->rk_enc[ 5] = KEYEXP256_2(ctx->rk_enc[3], ctx->rk_enc[4]);
            ctx->rk_enc[ 6] = KEYEXP256(ctx->rk_enc[4], ctx->rk_enc[5], 0x04);
            ctx->rk_enc[ 7] = KEYEXP256_2(ctx->rk_enc[5], ctx->rk_enc[6]);
            ctx->rk_enc[ 8] = KEYEXP256(ctx->rk_enc[6], ctx->rk_enc[7], 0x08);
            ctx->rk_enc[ 9] = KEYEXP256_2(ctx->rk_enc[7], ctx->rk_enc[8]);
            ctx->rk_enc[10] = KEYEXP256(ctx->rk_enc[8], ctx->rk_enc[9], 0x10);
            ctx->rk_enc[11] = KEYEXP256_2(ctx->rk_enc[9], ctx->rk_enc[10]);
            ctx->rk_enc[12] = KEYEXP256(ctx->rk_enc[10], ctx->rk_enc[11], 0x20);
            ctx->rk_enc[13] = KEYEXP256_2(ctx->rk_enc[11], ctx->rk_enc[12]);
            ctx->rk_enc[14] = KEYEXP256(ctx->rk_enc[12], ctx->rk_enc[13], 0x40);
            break;
        }
    }

    // derive decryption keys
    for(int i = 1; i < ctx->Nr; ++i) {
        ctx->rk_dec[ctx->Nr - i] = _mm_aesimc_si128(ctx->rk_enc[i]);
    }
    ctx->rk_dec[ 0] = ctx->rk_enc[ctx->Nr];

    return ctx->Nr;
}


static void aes_internal_encrypt (aes_context_t *ctx, const uint8_t pt[16], uint8_t ct[16]) {

    __m128i tmp = _mm_loadu_si128((__m128i*)pt);

    tmp = _mm_xor_si128(tmp, ctx->rk_enc[ 0]);
    tmp = _mm_aesenc_si128(tmp, ctx->rk_enc[ 1]);
    tmp = _mm_aesenc_si128(tmp, ctx->rk_enc[ 2]);
    tmp = _mm_aesenc_si128(tmp, ctx->rk_enc[ 3]);
    tmp = _mm_aesenc_si128(tmp, ctx->rk_enc[ 4]);
    tmp = _mm_aesenc_si128(tmp, ctx->rk_enc[ 5]);
    tmp = _mm_aesenc_si128(tmp, ctx->rk_enc[ 6]);
    tmp = _mm_aesenc_si128(tmp, ctx->rk_enc[ 7]);
    tmp = _mm_aesenc_si128(tmp, ctx->rk_enc[ 8]);
    tmp = _mm_aesenc_si128(tmp, ctx->rk_enc[ 9]);
    if(ctx->Nr > 10) {
        tmp = _mm_aesenc_si128(tmp, ctx->rk_enc[10]);
        tmp = _mm_aesenc_si128(tmp, ctx->rk_enc[11]);
        if(ctx->Nr > 12) {
            tmp = _mm_aesenc_si128(tmp, ctx->rk_enc[12]);
            tmp = _mm_aesenc_si128(tmp, ctx->rk_enc[13]);
        }
    }
    tmp = _mm_aesenclast_si128(tmp, ctx->rk_enc[ctx->Nr]);

    _mm_storeu_si128((__m128i*) ct, tmp);
}


static void aes_internal_decrypt (aes_context_t *ctx, const uint8_t ct[16], uint8_t pt[16]) {

    __m128i tmp = _mm_loadu_si128((__m128i*)ct);

    tmp = _mm_xor_si128(tmp, ctx->rk_dec[ 0]);
    tmp = _mm_aesdec_si128(tmp, ctx->rk_dec[ 1]);
    tmp = _mm_aesdec_si128(tmp, ctx->rk_dec[ 2]);
    tmp = _mm_aesdec_si128(tmp, ctx->rk_dec[ 3]);
    tmp = _mm_aesdec_si128(tmp, ctx->rk_dec[ 4]);
    tmp = _mm_aesdec_si128(tmp, ctx->rk_dec[ 5]);
    tmp = _mm_aesdec_si128(tmp, ctx->rk_dec[ 6]);
    tmp = _mm_aesdec_si128(tmp, ctx->rk_dec[ 7]);
    tmp = _mm_aesdec_si128(tmp, ctx->rk_dec[ 8]);
    tmp = _mm_aesdec_si128(tmp, ctx->rk_dec[ 9]);
    if(ctx->Nr > 10) {
        tmp = _mm_aesdec_si128(tmp, ctx->rk_dec[10]);
        tmp = _mm_aesdec_si128(tmp, ctx->rk_dec[11]);
        if(ctx->Nr > 12) {
            tmp = _mm_aesdec_si128(tmp, ctx->rk_dec[12]);
            tmp = _mm_aesdec_si128(tmp, ctx->rk_dec[13]);
        }
    }
    tmp = _mm_aesdeclast_si128(tmp, ctx->rk_enc[ 0]);

    _mm_storeu_si128((__m128i*) pt, tmp);
}


// public API


int aes_ecb_decrypt (unsigned char *out, const unsigned char *in, aes_context_t *ctx) {

    aes_internal_decrypt(ctx, in, out);

    return AES_BLOCK_SIZE;
}


// not used
int aes_ecb_encrypt (unsigned char *out, const unsigned char *in, aes_context_t *ctx) {

    aes_internal_encrypt(ctx, in, out);

    return AES_BLOCK_SIZE;
}


int aes_cbc_encrypt (unsigned char *out, const unsigned char *in, size_t in_len,
                     const unsigned char *iv, aes_context_t *ctx) {

    int n;                       /* number of blocks */
    int ret = (int)in_len & 15;  /* remainder        */

    __m128i ivec = _mm_loadu_si128((__m128i*)iv);

    for(n = in_len / 16; n != 0; n--) {
        __m128i tmp = _mm_loadu_si128((__m128i*)in);
        in += 16;
        tmp = _mm_xor_si128(tmp, ivec);

        tmp = _mm_xor_si128(tmp, ctx->rk_enc[ 0]);
        tmp = _mm_aesenc_si128(tmp, ctx->rk_enc[ 1]);
        tmp = _mm_aesenc_si128(tmp, ctx->rk_enc[ 2]);
        tmp = _mm_aesenc_si128(tmp, ctx->rk_enc[ 3]);
        tmp = _mm_aesenc_si128(tmp, ctx->rk_enc[ 4]);
        tmp = _mm_aesenc_si128(tmp, ctx->rk_enc[ 5]);
        tmp = _mm_aesenc_si128(tmp, ctx->rk_enc[ 6]);
        tmp = _mm_aesenc_si128(tmp, ctx->rk_enc[ 7]);
        tmp = _mm_aesenc_si128(tmp, ctx->rk_enc[ 8]);
        tmp = _mm_aesenc_si128(tmp, ctx->rk_enc[ 9]);
        if(ctx->Nr > 10) {
            tmp = _mm_aesenc_si128(tmp, ctx->rk_enc[10]);
            tmp = _mm_aesenc_si128(tmp, ctx->rk_enc[11]);
            if(ctx->Nr > 12) {
                tmp = _mm_aesenc_si128(tmp, ctx->rk_enc[12]);
                tmp = _mm_aesenc_si128(tmp, ctx->rk_enc[13]);
            }
        }
        tmp = _mm_aesenclast_si128(tmp, ctx->rk_enc[ctx->Nr]);

        ivec = tmp;

        _mm_storeu_si128((__m128i*)out, tmp);
        out += 16;
    }

    return ret;
}


int aes_cbc_decrypt (unsigned char *out, const unsigned char *in, size_t in_len,
                     const unsigned char *iv, aes_context_t *ctx) {

    int n;                       /* number of blocks */
    int ret = (int)in_len & 15;  /* remainder        */

    __m128i ivec = _mm_loadu_si128((__m128i*)iv);

    // 4 parallel rails of AES decryption to reduce data dependencies in x86's deep pipelines
    for(n = in_len / 16; n > 3; n -=4) {
        __m128i tmp1 = _mm_loadu_si128((__m128i*)in); in += 16;
        __m128i tmp2 = _mm_loadu_si128((__m128i*)in); in += 16;
        __m128i tmp3 = _mm_loadu_si128((__m128i*)in); in += 16;
        __m128i tmp4 = _mm_loadu_si128((__m128i*)in); in += 16;

        __m128i old_in1 = tmp1;
        __m128i old_in2 = tmp2;
        __m128i old_in3 = tmp3;
        __m128i old_in4 = tmp4;

        tmp1 = _mm_xor_si128(tmp1, ctx->rk_dec[ 0]); tmp2 = _mm_xor_si128(tmp2, ctx->rk_dec[ 0]);
        tmp3 = _mm_xor_si128(tmp3, ctx->rk_dec[ 0]); tmp4 = _mm_xor_si128(tmp4, ctx->rk_dec[ 0]);

        tmp1 = _mm_aesdec_si128(tmp1, ctx->rk_dec[ 1]); tmp2 = _mm_aesdec_si128(tmp2, ctx->rk_dec[ 1]);
        tmp3 = _mm_aesdec_si128(tmp3, ctx->rk_dec[ 1]); tmp4 = _mm_aesdec_si128(tmp4, ctx->rk_dec[ 1]);

        tmp1 = _mm_aesdec_si128(tmp1, ctx->rk_dec[ 2]); tmp2 = _mm_aesdec_si128(tmp2, ctx->rk_dec[ 2]);
        tmp3 = _mm_aesdec_si128(tmp3, ctx->rk_dec[ 2]); tmp4 = _mm_aesdec_si128(tmp4, ctx->rk_dec[ 2]);

        tmp1 = _mm_aesdec_si128(tmp1, ctx->rk_dec[ 3]); tmp2 = _mm_aesdec_si128(tmp2, ctx->rk_dec[ 3]);
        tmp3 = _mm_aesdec_si128(tmp3, ctx->rk_dec[ 3]); tmp4 = _mm_aesdec_si128(tmp4, ctx->rk_dec[ 3]);

        tmp1 = _mm_aesdec_si128(tmp1, ctx->rk_dec[ 4]); tmp2 = _mm_aesdec_si128(tmp2, ctx->rk_dec[ 4]);
        tmp3 = _mm_aesdec_si128(tmp3, ctx->rk_dec[ 4]); tmp4 = _mm_aesdec_si128(tmp4, ctx->rk_dec[ 4]);

        tmp1 = _mm_aesdec_si128(tmp1, ctx->rk_dec[ 5]); tmp2 = _mm_aesdec_si128(tmp2, ctx->rk_dec[ 5]);
        tmp3 = _mm_aesdec_si128(tmp3, ctx->rk_dec[ 5]); tmp4 = _mm_aesdec_si128(tmp4, ctx->rk_dec[ 5]);

        tmp1 = _mm_aesdec_si128(tmp1, ctx->rk_dec[ 6]); tmp2 = _mm_aesdec_si128(tmp2, ctx->rk_dec[ 6]);
        tmp3 = _mm_aesdec_si128(tmp3, ctx->rk_dec[ 6]); tmp4 = _mm_aesdec_si128(tmp4, ctx->rk_dec[ 6]);

        tmp1 = _mm_aesdec_si128(tmp1, ctx->rk_dec[ 7]); tmp2 = _mm_aesdec_si128(tmp2, ctx->rk_dec[ 7]);
        tmp3 = _mm_aesdec_si128(tmp3, ctx->rk_dec[ 7]); tmp4 = _mm_aesdec_si128(tmp4, ctx->rk_dec[ 7]);

        tmp1 = _mm_aesdec_si128(tmp1, ctx->rk_dec[ 8]); tmp2 = _mm_aesdec_si128(tmp2, ctx->rk_dec[ 8]);
        tmp3 = _mm_aesdec_si128(tmp3, ctx->rk_dec[ 8]); tmp4 = _mm_aesdec_si128(tmp4, ctx->rk_dec[ 8]);

        tmp1 = _mm_aesdec_si128(tmp1, ctx->rk_dec[ 9]); tmp2 = _mm_aesdec_si128(tmp2, ctx->rk_dec[ 9]);
        tmp3 = _mm_aesdec_si128(tmp3, ctx->rk_dec[ 9]); tmp4 = _mm_aesdec_si128(tmp4, ctx->rk_dec[ 9]);

        if(ctx->Nr > 10) {
            tmp1 = _mm_aesdec_si128(tmp1, ctx->rk_dec[10]); tmp2 = _mm_aesdec_si128(tmp2, ctx->rk_dec[10]);
            tmp3 = _mm_aesdec_si128(tmp3, ctx->rk_dec[10]); tmp4 = _mm_aesdec_si128(tmp4, ctx->rk_dec[10]);

            tmp1 = _mm_aesdec_si128(tmp1, ctx->rk_dec[11]); tmp2 = _mm_aesdec_si128(tmp2, ctx->rk_dec[11]);
            tmp3 = _mm_aesdec_si128(tmp3, ctx->rk_dec[11]); tmp4 = _mm_aesdec_si128(tmp4, ctx->rk_dec[11]);

            if(ctx->Nr > 12) {
                tmp1 = _mm_aesdec_si128(tmp1, ctx->rk_dec[12]); tmp2 = _mm_aesdec_si128(tmp2, ctx->rk_dec[12]);
                tmp3 = _mm_aesdec_si128(tmp3, ctx->rk_dec[12]); tmp4 = _mm_aesdec_si128(tmp4, ctx->rk_dec[12]);

                tmp1 = _mm_aesdec_si128(tmp1, ctx->rk_dec[13]); tmp2 = _mm_aesdec_si128(tmp2, ctx->rk_dec[13]);
                tmp3 = _mm_aesdec_si128(tmp3, ctx->rk_dec[13]); tmp4 = _mm_aesdec_si128(tmp4, ctx->rk_dec[13]);
            }
        }
        tmp1 =     _mm_aesdeclast_si128(tmp1, ctx->rk_enc[ 0]); tmp2 = _mm_aesdeclast_si128(tmp2, ctx->rk_enc[ 0]);
        tmp3 =     _mm_aesdeclast_si128(tmp3, ctx->rk_enc[ 0]); tmp4 = _mm_aesdeclast_si128(tmp4, ctx->rk_enc[ 0]);

        tmp1 = _mm_xor_si128(tmp1, ivec); tmp2 = _mm_xor_si128(tmp2, old_in1);
        tmp3 = _mm_xor_si128(tmp3, old_in2); tmp4 = _mm_xor_si128(tmp4, old_in3);

        ivec = old_in4;

        _mm_storeu_si128((__m128i*) out, tmp1); out += 16;
        _mm_storeu_si128((__m128i*) out, tmp2); out += 16;
        _mm_storeu_si128((__m128i*) out, tmp3); out += 16;
        _mm_storeu_si128((__m128i*) out, tmp4); out += 16;
    }
    // now: less than 4 blocks remaining

    // if 2 or 3 blocks remaining --> this code handles two of them
    if(n > 1) {
        n-= 2;

        __m128i tmp1 = _mm_loadu_si128((__m128i*)in); in += 16;
        __m128i tmp2 = _mm_loadu_si128((__m128i*)in); in += 16;

        __m128i old_in1 = tmp1;
        __m128i old_in2 = tmp2;

        tmp1 = _mm_xor_si128(tmp1, ctx->rk_dec[ 0]); tmp2 = _mm_xor_si128(tmp2, ctx->rk_dec[ 0]);
        tmp1 = _mm_aesdec_si128(tmp1, ctx->rk_dec[ 1]); tmp2 = _mm_aesdec_si128(tmp2, ctx->rk_dec[ 1]);
        tmp1 = _mm_aesdec_si128(tmp1, ctx->rk_dec[ 2]); tmp2 = _mm_aesdec_si128(tmp2, ctx->rk_dec[ 2]);
        tmp1 = _mm_aesdec_si128(tmp1, ctx->rk_dec[ 3]); tmp2 = _mm_aesdec_si128(tmp2, ctx->rk_dec[ 3]);
        tmp1 = _mm_aesdec_si128(tmp1, ctx->rk_dec[ 4]); tmp2 = _mm_aesdec_si128(tmp2, ctx->rk_dec[ 4]);
        tmp1 = _mm_aesdec_si128(tmp1, ctx->rk_dec[ 5]); tmp2 = _mm_aesdec_si128(tmp2, ctx->rk_dec[ 5]);
        tmp1 = _mm_aesdec_si128(tmp1, ctx->rk_dec[ 6]); tmp2 = _mm_aesdec_si128(tmp2, ctx->rk_dec[ 6]);
        tmp1 = _mm_aesdec_si128(tmp1, ctx->rk_dec[ 7]); tmp2 = _mm_aesdec_si128(tmp2, ctx->rk_dec[ 7]);
        tmp1 = _mm_aesdec_si128(tmp1, ctx->rk_dec[ 8]); tmp2 = _mm_aesdec_si128(tmp2, ctx->rk_dec[ 8]);
        tmp1 = _mm_aesdec_si128(tmp1, ctx->rk_dec[ 9]); tmp2 = _mm_aesdec_si128(tmp2, ctx->rk_dec[ 9]);
        if(ctx->Nr > 10) {
            tmp1 = _mm_aesdec_si128(tmp1, ctx->rk_dec[10]); tmp2 = _mm_aesdec_si128(tmp2, ctx->rk_dec[10]);
            tmp1 = _mm_aesdec_si128(tmp1, ctx->rk_dec[11]); tmp2 = _mm_aesdec_si128(tmp2, ctx->rk_dec[11]);
            if(ctx->Nr > 12) {
                tmp1 = _mm_aesdec_si128(tmp1, ctx->rk_dec[12]); tmp2 = _mm_aesdec_si128(tmp2, ctx->rk_dec[12]);
                tmp1 = _mm_aesdec_si128(tmp1, ctx->rk_dec[13]); tmp2 = _mm_aesdec_si128(tmp2, ctx->rk_dec[13]);
            }
        }
        tmp1 = _mm_aesdeclast_si128(tmp1, ctx->rk_enc[ 0]); tmp2 = _mm_aesdeclast_si128(tmp2, ctx->rk_enc[ 0]);

        tmp1 = _mm_xor_si128(tmp1, ivec); tmp2 = _mm_xor_si128(tmp2, old_in1);

        ivec = old_in2;

        _mm_storeu_si128((__m128i*) out, tmp1); out += 16;
        _mm_storeu_si128((__m128i*) out, tmp2); out += 16;
    }

    // one block remaining
    if(n) {
        __m128i tmp = _mm_loadu_si128((__m128i*)in);

        tmp = _mm_xor_si128(tmp, ctx->rk_dec[ 0]);
        tmp = _mm_aesdec_si128(tmp, ctx->rk_dec[ 1]);
        tmp = _mm_aesdec_si128(tmp, ctx->rk_dec[ 2]);
        tmp = _mm_aesdec_si128(tmp, ctx->rk_dec[ 3]);
        tmp = _mm_aesdec_si128(tmp, ctx->rk_dec[ 4]);
        tmp = _mm_aesdec_si128(tmp, ctx->rk_dec[ 5]);
        tmp = _mm_aesdec_si128(tmp, ctx->rk_dec[ 6]);
        tmp = _mm_aesdec_si128(tmp, ctx->rk_dec[ 7]);
        tmp = _mm_aesdec_si128(tmp, ctx->rk_dec[ 8]);
        tmp = _mm_aesdec_si128(tmp, ctx->rk_dec[ 9]);
        if(ctx->Nr > 10) {
            tmp = _mm_aesdec_si128(tmp, ctx->rk_dec[10]);
            tmp = _mm_aesdec_si128(tmp, ctx->rk_dec[11]);
            if(ctx->Nr > 12) {
                tmp = _mm_aesdec_si128(tmp, ctx->rk_dec[12]);
                tmp = _mm_aesdec_si128(tmp, ctx->rk_dec[13]);
            }
        }
        tmp = _mm_aesdeclast_si128(tmp, ctx->rk_enc[ 0]);

        tmp = _mm_xor_si128(tmp, ivec);

        _mm_storeu_si128((__m128i*) out, tmp);
    }

    return ret;
}


int aes_init (const unsigned char *key, size_t key_size, aes_context_t **ctx) {

    // allocate context...
    *ctx = (aes_context_t*) calloc(1, sizeof(aes_context_t));
    if(!(*ctx))
        return -1;
    // ...and fill her up:

    // initialize data structures

    // check key size and make key size (given in bytes) dependant settings
    switch(key_size) {
        case AES128_KEY_BYTES:    // 128 bit key size
            break;
        case AES192_KEY_BYTES:    // 192 bit key size
            break;
        case AES256_KEY_BYTES:    // 256 bit key size
            break;
        default:
            traceEvent(TRACE_ERROR, "aes_init invalid key size %u\n", key_size);
            return -1;
    }

    // key materiel handling
    aes_internal_key_setup( *ctx, key, 8 * key_size);

    return 0;
}


#else // plain C --------------------------------------------------------------------------


// rijndael-alg-fst.c version 3.0 (December 2000)
// optimised ANSI C code for the Rijndael cipher (now AES)
// original authors: Vincent Rijmen <vincent.rijmen@esat.kuleuven.ac.be>
//                   Antoon Bosselaers <antoon.bosselaers@esat.kuleuven.ac.be>
//                   Paulo Barreto <paulo.barreto@terra.com.br>
//
// was put in the public domain, taken (and modified) from
// https://fastcrypto.org/front/misc/rijndael-alg-fst.c


// Te0[x] = S [x].[02, 01, 01, 03];
static const uint32_t Te0[256] = {
    0xc66363a5U, 0xf87c7c84U, 0xee777799U, 0xf67b7b8dU, 0xfff2f20dU, 0xd66b6bbdU, 0xde6f6fb1U, 0x91c5c554U,
    0x60303050U, 0x02010103U, 0xce6767a9U, 0x562b2b7dU, 0xe7fefe19U, 0xb5d7d762U, 0x4dababe6U, 0xec76769aU,
    0x8fcaca45U, 0x1f82829dU, 0x89c9c940U, 0xfa7d7d87U, 0xeffafa15U, 0xb25959ebU, 0x8e4747c9U, 0xfbf0f00bU,
    0x41adadecU, 0xb3d4d467U, 0x5fa2a2fdU, 0x45afafeaU, 0x239c9cbfU, 0x53a4a4f7U, 0xe4727296U, 0x9bc0c05bU,
    0x75b7b7c2U, 0xe1fdfd1cU, 0x3d9393aeU, 0x4c26266aU, 0x6c36365aU, 0x7e3f3f41U, 0xf5f7f702U, 0x83cccc4fU,
    0x6834345cU, 0x51a5a5f4U, 0xd1e5e534U, 0xf9f1f108U, 0xe2717193U, 0xabd8d873U, 0x62313153U, 0x2a15153fU,
    0x0804040cU, 0x95c7c752U, 0x46232365U, 0x9dc3c35eU, 0x30181828U, 0x379696a1U, 0x0a05050fU, 0x2f9a9ab5U,
    0x0e070709U, 0x24121236U, 0x1b80809bU, 0xdfe2e23dU, 0xcdebeb26U, 0x4e272769U, 0x7fb2b2cdU, 0xea75759fU,
    0x1209091bU, 0x1d83839eU, 0x582c2c74U, 0x341a1a2eU, 0x361b1b2dU, 0xdc6e6eb2U, 0xb45a5aeeU, 0x5ba0a0fbU,
    0xa45252f6U, 0x763b3b4dU, 0xb7d6d661U, 0x7db3b3ceU, 0x5229297bU, 0xdde3e33eU, 0x5e2f2f71U, 0x13848497U,
    0xa65353f5U, 0xb9d1d168U, 0x00000000U, 0xc1eded2cU, 0x40202060U, 0xe3fcfc1fU, 0x79b1b1c8U, 0xb65b5bedU,
    0xd46a6abeU, 0x8dcbcb46U, 0x67bebed9U, 0x7239394bU, 0x944a4adeU, 0x984c4cd4U, 0xb05858e8U, 0x85cfcf4aU,
    0xbbd0d06bU, 0xc5efef2aU, 0x4faaaae5U, 0xedfbfb16U, 0x864343c5U, 0x9a4d4dd7U, 0x66333355U, 0x11858594U,
    0x8a4545cfU, 0xe9f9f910U, 0x04020206U, 0xfe7f7f81U, 0xa05050f0U, 0x783c3c44U, 0x259f9fbaU, 0x4ba8a8e3U,
    0xa25151f3U, 0x5da3a3feU, 0x804040c0U, 0x058f8f8aU, 0x3f9292adU, 0x219d9dbcU, 0x70383848U, 0xf1f5f504U,
    0x63bcbcdfU, 0x77b6b6c1U, 0xafdada75U, 0x42212163U, 0x20101030U, 0xe5ffff1aU, 0xfdf3f30eU, 0xbfd2d26dU,
    0x81cdcd4cU, 0x180c0c14U, 0x26131335U, 0xc3ecec2fU, 0xbe5f5fe1U, 0x359797a2U, 0x884444ccU, 0x2e171739U,
    0x93c4c457U, 0x55a7a7f2U, 0xfc7e7e82U, 0x7a3d3d47U, 0xc86464acU, 0xba5d5de7U, 0x3219192bU, 0xe6737395U,
    0xc06060a0U, 0x19818198U, 0x9e4f4fd1U, 0xa3dcdc7fU, 0x44222266U, 0x542a2a7eU, 0x3b9090abU, 0x0b888883U,
    0x8c4646caU, 0xc7eeee29U, 0x6bb8b8d3U, 0x2814143cU, 0xa7dede79U, 0xbc5e5ee2U, 0x160b0b1dU, 0xaddbdb76U,
    0xdbe0e03bU, 0x64323256U, 0x743a3a4eU, 0x140a0a1eU, 0x924949dbU, 0x0c06060aU, 0x4824246cU, 0xb85c5ce4U,
    0x9fc2c25dU, 0xbdd3d36eU, 0x43acacefU, 0xc46262a6U, 0x399191a8U, 0x319595a4U, 0xd3e4e437U, 0xf279798bU,
    0xd5e7e732U, 0x8bc8c843U, 0x6e373759U, 0xda6d6db7U, 0x018d8d8cU, 0xb1d5d564U, 0x9c4e4ed2U, 0x49a9a9e0U,
    0xd86c6cb4U, 0xac5656faU, 0xf3f4f407U, 0xcfeaea25U, 0xca6565afU, 0xf47a7a8eU, 0x47aeaee9U, 0x10080818U,
    0x6fbabad5U, 0xf0787888U, 0x4a25256fU, 0x5c2e2e72U, 0x381c1c24U, 0x57a6a6f1U, 0x73b4b4c7U, 0x97c6c651U,
    0xcbe8e823U, 0xa1dddd7cU, 0xe874749cU, 0x3e1f1f21U, 0x964b4bddU, 0x61bdbddcU, 0x0d8b8b86U, 0x0f8a8a85U,
    0xe0707090U, 0x7c3e3e42U, 0x71b5b5c4U, 0xcc6666aaU, 0x904848d8U, 0x06030305U, 0xf7f6f601U, 0x1c0e0e12U,
    0xc26161a3U, 0x6a35355fU, 0xae5757f9U, 0x69b9b9d0U, 0x17868691U, 0x99c1c158U, 0x3a1d1d27U, 0x279e9eb9U,
    0xd9e1e138U, 0xebf8f813U, 0x2b9898b3U, 0x22111133U, 0xd26969bbU, 0xa9d9d970U, 0x078e8e89U, 0x339494a7U,
    0x2d9b9bb6U, 0x3c1e1e22U, 0x15878792U, 0xc9e9e920U, 0x87cece49U, 0xaa5555ffU, 0x50282878U, 0xa5dfdf7aU,
    0x038c8c8fU, 0x59a1a1f8U, 0x09898980U, 0x1a0d0d17U, 0x65bfbfdaU, 0xd7e6e631U, 0x844242c6U, 0xd06868b8U,
    0x824141c3U, 0x299999b0U, 0x5a2d2d77U, 0x1e0f0f11U, 0x7bb0b0cbU, 0xa85454fcU, 0x6dbbbbd6U, 0x2c16163aU
};

// Te1[x] = S [x].[03, 02, 01, 01];
static const uint32_t Te1[256] = {
    0xa5c66363U, 0x84f87c7cU, 0x99ee7777U, 0x8df67b7bU, 0x0dfff2f2U, 0xbdd66b6bU, 0xb1de6f6fU, 0x5491c5c5U,
    0x50603030U, 0x03020101U, 0xa9ce6767U, 0x7d562b2bU, 0x19e7fefeU, 0x62b5d7d7U, 0xe64dababU, 0x9aec7676U,
    0x458fcacaU, 0x9d1f8282U, 0x4089c9c9U, 0x87fa7d7dU, 0x15effafaU, 0xebb25959U, 0xc98e4747U, 0x0bfbf0f0U,
    0xec41adadU, 0x67b3d4d4U, 0xfd5fa2a2U, 0xea45afafU, 0xbf239c9cU, 0xf753a4a4U, 0x96e47272U, 0x5b9bc0c0U,
    0xc275b7b7U, 0x1ce1fdfdU, 0xae3d9393U, 0x6a4c2626U, 0x5a6c3636U, 0x417e3f3fU, 0x02f5f7f7U, 0x4f83ccccU,
    0x5c683434U, 0xf451a5a5U, 0x34d1e5e5U, 0x08f9f1f1U, 0x93e27171U, 0x73abd8d8U, 0x53623131U, 0x3f2a1515U,
    0x0c080404U, 0x5295c7c7U, 0x65462323U, 0x5e9dc3c3U, 0x28301818U, 0xa1379696U, 0x0f0a0505U, 0xb52f9a9aU,
    0x090e0707U, 0x36241212U, 0x9b1b8080U, 0x3ddfe2e2U, 0x26cdebebU, 0x694e2727U, 0xcd7fb2b2U, 0x9fea7575U,
    0x1b120909U, 0x9e1d8383U, 0x74582c2cU, 0x2e341a1aU, 0x2d361b1bU, 0xb2dc6e6eU, 0xeeb45a5aU, 0xfb5ba0a0U,
    0xf6a45252U, 0x4d763b3bU, 0x61b7d6d6U, 0xce7db3b3U, 0x7b522929U, 0x3edde3e3U, 0x715e2f2fU, 0x97138484U,
    0xf5a65353U, 0x68b9d1d1U, 0x00000000U, 0x2cc1ededU, 0x60402020U, 0x1fe3fcfcU, 0xc879b1b1U, 0xedb65b5bU,
    0xbed46a6aU, 0x468dcbcbU, 0xd967bebeU, 0x4b723939U, 0xde944a4aU, 0xd4984c4cU, 0xe8b05858U, 0x4a85cfcfU,
    0x6bbbd0d0U, 0x2ac5efefU, 0xe54faaaaU, 0x16edfbfbU, 0xc5864343U, 0xd79a4d4dU, 0x55663333U, 0x94118585U,
    0xcf8a4545U, 0x10e9f9f9U, 0x06040202U, 0x81fe7f7fU, 0xf0a05050U, 0x44783c3cU, 0xba259f9fU, 0xe34ba8a8U,
    0xf3a25151U, 0xfe5da3a3U, 0xc0804040U, 0x8a058f8fU, 0xad3f9292U, 0xbc219d9dU, 0x48703838U, 0x04f1f5f5U,
    0xdf63bcbcU, 0xc177b6b6U, 0x75afdadaU, 0x63422121U, 0x30201010U, 0x1ae5ffffU, 0x0efdf3f3U, 0x6dbfd2d2U,
    0x4c81cdcdU, 0x14180c0cU, 0x35261313U, 0x2fc3ececU, 0xe1be5f5fU, 0xa2359797U, 0xcc884444U, 0x392e1717U,
    0x5793c4c4U, 0xf255a7a7U, 0x82fc7e7eU, 0x477a3d3dU, 0xacc86464U, 0xe7ba5d5dU, 0x2b321919U, 0x95e67373U,
    0xa0c06060U, 0x98198181U, 0xd19e4f4fU, 0x7fa3dcdcU, 0x66442222U, 0x7e542a2aU, 0xab3b9090U, 0x830b8888U,
    0xca8c4646U, 0x29c7eeeeU, 0xd36bb8b8U, 0x3c281414U, 0x79a7dedeU, 0xe2bc5e5eU, 0x1d160b0bU, 0x76addbdbU,
    0x3bdbe0e0U, 0x56643232U, 0x4e743a3aU, 0x1e140a0aU, 0xdb924949U, 0x0a0c0606U, 0x6c482424U, 0xe4b85c5cU,
    0x5d9fc2c2U, 0x6ebdd3d3U, 0xef43acacU, 0xa6c46262U, 0xa8399191U, 0xa4319595U, 0x37d3e4e4U, 0x8bf27979U,
    0x32d5e7e7U, 0x438bc8c8U, 0x596e3737U, 0xb7da6d6dU, 0x8c018d8dU, 0x64b1d5d5U, 0xd29c4e4eU, 0xe049a9a9U,
    0xb4d86c6cU, 0xfaac5656U, 0x07f3f4f4U, 0x25cfeaeaU, 0xafca6565U, 0x8ef47a7aU, 0xe947aeaeU, 0x18100808U,
    0xd56fbabaU, 0x88f07878U, 0x6f4a2525U, 0x725c2e2eU, 0x24381c1cU, 0xf157a6a6U, 0xc773b4b4U, 0x5197c6c6U,
    0x23cbe8e8U, 0x7ca1ddddU, 0x9ce87474U, 0x213e1f1fU, 0xdd964b4bU, 0xdc61bdbdU, 0x860d8b8bU, 0x850f8a8aU,
    0x90e07070U, 0x427c3e3eU, 0xc471b5b5U, 0xaacc6666U, 0xd8904848U, 0x05060303U, 0x01f7f6f6U, 0x121c0e0eU,
    0xa3c26161U, 0x5f6a3535U, 0xf9ae5757U, 0xd069b9b9U, 0x91178686U, 0x5899c1c1U, 0x273a1d1dU, 0xb9279e9eU,
    0x38d9e1e1U, 0x13ebf8f8U, 0xb32b9898U, 0x33221111U, 0xbbd26969U, 0x70a9d9d9U, 0x89078e8eU, 0xa7339494U,
    0xb62d9b9bU, 0x223c1e1eU, 0x92158787U, 0x20c9e9e9U, 0x4987ceceU, 0xffaa5555U, 0x78502828U, 0x7aa5dfdfU,
    0x8f038c8cU, 0xf859a1a1U, 0x80098989U, 0x171a0d0dU, 0xda65bfbfU, 0x31d7e6e6U, 0xc6844242U, 0xb8d06868U,
    0xc3824141U, 0xb0299999U, 0x775a2d2dU, 0x111e0f0fU, 0xcb7bb0b0U, 0xfca85454U, 0xd66dbbbbU, 0x3a2c1616U
};

// Te2[x] = S [x].[01, 03, 02, 01];
static const uint32_t Te2[256] = {
    0x63a5c663U, 0x7c84f87cU, 0x7799ee77U, 0x7b8df67bU, 0xf20dfff2U, 0x6bbdd66bU, 0x6fb1de6fU, 0xc55491c5U,
    0x30506030U, 0x01030201U, 0x67a9ce67U, 0x2b7d562bU, 0xfe19e7feU, 0xd762b5d7U, 0xabe64dabU, 0x769aec76U,
    0xca458fcaU, 0x829d1f82U, 0xc94089c9U, 0x7d87fa7dU, 0xfa15effaU, 0x59ebb259U, 0x47c98e47U, 0xf00bfbf0U,
    0xadec41adU, 0xd467b3d4U, 0xa2fd5fa2U, 0xafea45afU, 0x9cbf239cU, 0xa4f753a4U, 0x7296e472U, 0xc05b9bc0U,
    0xb7c275b7U, 0xfd1ce1fdU, 0x93ae3d93U, 0x266a4c26U, 0x365a6c36U, 0x3f417e3fU, 0xf702f5f7U, 0xcc4f83ccU,
    0x345c6834U, 0xa5f451a5U, 0xe534d1e5U, 0xf108f9f1U, 0x7193e271U, 0xd873abd8U, 0x31536231U, 0x153f2a15U,
    0x040c0804U, 0xc75295c7U, 0x23654623U, 0xc35e9dc3U, 0x18283018U, 0x96a13796U, 0x050f0a05U, 0x9ab52f9aU,
    0x07090e07U, 0x12362412U, 0x809b1b80U, 0xe23ddfe2U, 0xeb26cdebU, 0x27694e27U, 0xb2cd7fb2U, 0x759fea75U,
    0x091b1209U, 0x839e1d83U, 0x2c74582cU, 0x1a2e341aU, 0x1b2d361bU, 0x6eb2dc6eU, 0x5aeeb45aU, 0xa0fb5ba0U,
    0x52f6a452U, 0x3b4d763bU, 0xd661b7d6U, 0xb3ce7db3U, 0x297b5229U, 0xe33edde3U, 0x2f715e2fU, 0x84971384U,
    0x53f5a653U, 0xd168b9d1U, 0x00000000U, 0xed2cc1edU, 0x20604020U, 0xfc1fe3fcU, 0xb1c879b1U, 0x5bedb65bU,
    0x6abed46aU, 0xcb468dcbU, 0xbed967beU, 0x394b7239U, 0x4ade944aU, 0x4cd4984cU, 0x58e8b058U, 0xcf4a85cfU,
    0xd06bbbd0U, 0xef2ac5efU, 0xaae54faaU, 0xfb16edfbU, 0x43c58643U, 0x4dd79a4dU, 0x33556633U, 0x85941185U,
    0x45cf8a45U, 0xf910e9f9U, 0x02060402U, 0x7f81fe7fU, 0x50f0a050U, 0x3c44783cU, 0x9fba259fU, 0xa8e34ba8U,
    0x51f3a251U, 0xa3fe5da3U, 0x40c08040U, 0x8f8a058fU, 0x92ad3f92U, 0x9dbc219dU, 0x38487038U, 0xf504f1f5U,
    0xbcdf63bcU, 0xb6c177b6U, 0xda75afdaU, 0x21634221U, 0x10302010U, 0xff1ae5ffU, 0xf30efdf3U, 0xd26dbfd2U,
    0xcd4c81cdU, 0x0c14180cU, 0x13352613U, 0xec2fc3ecU, 0x5fe1be5fU, 0x97a23597U, 0x44cc8844U, 0x17392e17U,
    0xc45793c4U, 0xa7f255a7U, 0x7e82fc7eU, 0x3d477a3dU, 0x64acc864U, 0x5de7ba5dU, 0x192b3219U, 0x7395e673U,
    0x60a0c060U, 0x81981981U, 0x4fd19e4fU, 0xdc7fa3dcU, 0x22664422U, 0x2a7e542aU, 0x90ab3b90U, 0x88830b88U,
    0x46ca8c46U, 0xee29c7eeU, 0xb8d36bb8U, 0x143c2814U, 0xde79a7deU, 0x5ee2bc5eU, 0x0b1d160bU, 0xdb76addbU,
    0xe03bdbe0U, 0x32566432U, 0x3a4e743aU, 0x0a1e140aU, 0x49db9249U, 0x060a0c06U, 0x246c4824U, 0x5ce4b85cU,
    0xc25d9fc2U, 0xd36ebdd3U, 0xacef43acU, 0x62a6c462U, 0x91a83991U, 0x95a43195U, 0xe437d3e4U, 0x798bf279U,
    0xe732d5e7U, 0xc8438bc8U, 0x37596e37U, 0x6db7da6dU, 0x8d8c018dU, 0xd564b1d5U, 0x4ed29c4eU, 0xa9e049a9U,
    0x6cb4d86cU, 0x56faac56U, 0xf407f3f4U, 0xea25cfeaU, 0x65afca65U, 0x7a8ef47aU, 0xaee947aeU, 0x08181008U,
    0xbad56fbaU, 0x7888f078U, 0x256f4a25U, 0x2e725c2eU, 0x1c24381cU, 0xa6f157a6U, 0xb4c773b4U, 0xc65197c6U,
    0xe823cbe8U, 0xdd7ca1ddU, 0x749ce874U, 0x1f213e1fU, 0x4bdd964bU, 0xbddc61bdU, 0x8b860d8bU, 0x8a850f8aU,
    0x7090e070U, 0x3e427c3eU, 0xb5c471b5U, 0x66aacc66U, 0x48d89048U, 0x03050603U, 0xf601f7f6U, 0x0e121c0eU,
    0x61a3c261U, 0x355f6a35U, 0x57f9ae57U, 0xb9d069b9U, 0x86911786U, 0xc15899c1U, 0x1d273a1dU, 0x9eb9279eU,
    0xe138d9e1U, 0xf813ebf8U, 0x98b32b98U, 0x11332211U, 0x69bbd269U, 0xd970a9d9U, 0x8e89078eU, 0x94a73394U,
    0x9bb62d9bU, 0x1e223c1eU, 0x87921587U, 0xe920c9e9U, 0xce4987ceU, 0x55ffaa55U, 0x28785028U, 0xdf7aa5dfU,
    0x8c8f038cU, 0xa1f859a1U, 0x89800989U, 0x0d171a0dU, 0xbfda65bfU, 0xe631d7e6U, 0x42c68442U, 0x68b8d068U,
    0x41c38241U, 0x99b02999U, 0x2d775a2dU, 0x0f111e0fU, 0xb0cb7bb0U, 0x54fca854U, 0xbbd66dbbU, 0x163a2c16U
};

// Te3[x] = S [x].[01, 01, 03, 02];
static const uint32_t Te3[256] = {
    0x6363a5c6U, 0x7c7c84f8U, 0x777799eeU, 0x7b7b8df6U, 0xf2f20dffU, 0x6b6bbdd6U, 0x6f6fb1deU, 0xc5c55491U,
    0x30305060U, 0x01010302U, 0x6767a9ceU, 0x2b2b7d56U, 0xfefe19e7U, 0xd7d762b5U, 0xababe64dU, 0x76769aecU,
    0xcaca458fU, 0x82829d1fU, 0xc9c94089U, 0x7d7d87faU, 0xfafa15efU, 0x5959ebb2U, 0x4747c98eU, 0xf0f00bfbU,
    0xadadec41U, 0xd4d467b3U, 0xa2a2fd5fU, 0xafafea45U, 0x9c9cbf23U, 0xa4a4f753U, 0x727296e4U, 0xc0c05b9bU,
    0xb7b7c275U, 0xfdfd1ce1U, 0x9393ae3dU, 0x26266a4cU, 0x36365a6cU, 0x3f3f417eU, 0xf7f702f5U, 0xcccc4f83U,
    0x34345c68U, 0xa5a5f451U, 0xe5e534d1U, 0xf1f108f9U, 0x717193e2U, 0xd8d873abU, 0x31315362U, 0x15153f2aU,
    0x04040c08U, 0xc7c75295U, 0x23236546U, 0xc3c35e9dU, 0x18182830U, 0x9696a137U, 0x05050f0aU, 0x9a9ab52fU,
    0x0707090eU, 0x12123624U, 0x80809b1bU, 0xe2e23ddfU, 0xebeb26cdU, 0x2727694eU, 0xb2b2cd7fU, 0x75759feaU,
    0x09091b12U, 0x83839e1dU, 0x2c2c7458U, 0x1a1a2e34U, 0x1b1b2d36U, 0x6e6eb2dcU, 0x5a5aeeb4U, 0xa0a0fb5bU,
    0x5252f6a4U, 0x3b3b4d76U, 0xd6d661b7U, 0xb3b3ce7dU, 0x29297b52U, 0xe3e33eddU, 0x2f2f715eU, 0x84849713U,
    0x5353f5a6U, 0xd1d168b9U, 0x00000000U, 0xeded2cc1U, 0x20206040U, 0xfcfc1fe3U, 0xb1b1c879U, 0x5b5bedb6U,
    0x6a6abed4U, 0xcbcb468dU, 0xbebed967U, 0x39394b72U, 0x4a4ade94U, 0x4c4cd498U, 0x5858e8b0U, 0xcfcf4a85U,
    0xd0d06bbbU, 0xefef2ac5U, 0xaaaae54fU, 0xfbfb16edU, 0x4343c586U, 0x4d4dd79aU, 0x33335566U, 0x85859411U,
    0x4545cf8aU, 0xf9f910e9U, 0x02020604U, 0x7f7f81feU, 0x5050f0a0U, 0x3c3c4478U, 0x9f9fba25U, 0xa8a8e34bU,
    0x5151f3a2U, 0xa3a3fe5dU, 0x4040c080U, 0x8f8f8a05U, 0x9292ad3fU, 0x9d9dbc21U, 0x38384870U, 0xf5f504f1U,
    0xbcbcdf63U, 0xb6b6c177U, 0xdada75afU, 0x21216342U, 0x10103020U, 0xffff1ae5U, 0xf3f30efdU, 0xd2d26dbfU,
    0xcdcd4c81U, 0x0c0c1418U, 0x13133526U, 0xecec2fc3U, 0x5f5fe1beU, 0x9797a235U, 0x4444cc88U, 0x1717392eU,
    0xc4c45793U, 0xa7a7f255U, 0x7e7e82fcU, 0x3d3d477aU, 0x6464acc8U, 0x5d5de7baU, 0x19192b32U, 0x737395e6U,
    0x6060a0c0U, 0x81819819U, 0x4f4fd19eU, 0xdcdc7fa3U, 0x22226644U, 0x2a2a7e54U, 0x9090ab3bU, 0x8888830bU,
    0x4646ca8cU, 0xeeee29c7U, 0xb8b8d36bU, 0x14143c28U, 0xdede79a7U, 0x5e5ee2bcU, 0x0b0b1d16U, 0xdbdb76adU,
    0xe0e03bdbU, 0x32325664U, 0x3a3a4e74U, 0x0a0a1e14U, 0x4949db92U, 0x06060a0cU, 0x24246c48U, 0x5c5ce4b8U,
    0xc2c25d9fU, 0xd3d36ebdU, 0xacacef43U, 0x6262a6c4U, 0x9191a839U, 0x9595a431U, 0xe4e437d3U, 0x79798bf2U,
    0xe7e732d5U, 0xc8c8438bU, 0x3737596eU, 0x6d6db7daU, 0x8d8d8c01U, 0xd5d564b1U, 0x4e4ed29cU, 0xa9a9e049U,
    0x6c6cb4d8U, 0x5656faacU, 0xf4f407f3U, 0xeaea25cfU, 0x6565afcaU, 0x7a7a8ef4U, 0xaeaee947U, 0x08081810U,
    0xbabad56fU, 0x787888f0U, 0x25256f4aU, 0x2e2e725cU, 0x1c1c2438U, 0xa6a6f157U, 0xb4b4c773U, 0xc6c65197U,
    0xe8e823cbU, 0xdddd7ca1U, 0x74749ce8U, 0x1f1f213eU, 0x4b4bdd96U, 0xbdbddc61U, 0x8b8b860dU, 0x8a8a850fU,
    0x707090e0U, 0x3e3e427cU, 0xb5b5c471U, 0x6666aaccU, 0x4848d890U, 0x03030506U, 0xf6f601f7U, 0x0e0e121cU,
    0x6161a3c2U, 0x35355f6aU, 0x5757f9aeU, 0xb9b9d069U, 0x86869117U, 0xc1c15899U, 0x1d1d273aU, 0x9e9eb927U,
    0xe1e138d9U, 0xf8f813ebU, 0x9898b32bU, 0x11113322U, 0x6969bbd2U, 0xd9d970a9U, 0x8e8e8907U, 0x9494a733U,
    0x9b9bb62dU, 0x1e1e223cU, 0x87879215U, 0xe9e920c9U, 0xcece4987U, 0x5555ffaaU, 0x28287850U, 0xdfdf7aa5U,
    0x8c8c8f03U, 0xa1a1f859U, 0x89898009U, 0x0d0d171aU, 0xbfbfda65U, 0xe6e631d7U, 0x4242c684U, 0x6868b8d0U,
    0x4141c382U, 0x9999b029U, 0x2d2d775aU, 0x0f0f111eU, 0xb0b0cb7bU, 0x5454fca8U, 0xbbbbd66dU, 0x16163a2cU
};

// Te4[x] = S [x].[01, 01, 01, 01];
static const uint32_t Te4[256] = {
    0x63636363U, 0x7c7c7c7cU, 0x77777777U, 0x7b7b7b7bU, 0xf2f2f2f2U, 0x6b6b6b6bU, 0x6f6f6f6fU, 0xc5c5c5c5U,
    0x30303030U, 0x01010101U, 0x67676767U, 0x2b2b2b2bU, 0xfefefefeU, 0xd7d7d7d7U, 0xababababU, 0x76767676U,
    0xcacacacaU, 0x82828282U, 0xc9c9c9c9U, 0x7d7d7d7dU, 0xfafafafaU, 0x59595959U, 0x47474747U, 0xf0f0f0f0U,
    0xadadadadU, 0xd4d4d4d4U, 0xa2a2a2a2U, 0xafafafafU, 0x9c9c9c9cU, 0xa4a4a4a4U, 0x72727272U, 0xc0c0c0c0U,
    0xb7b7b7b7U, 0xfdfdfdfdU, 0x93939393U, 0x26262626U, 0x36363636U, 0x3f3f3f3fU, 0xf7f7f7f7U, 0xccccccccU,
    0x34343434U, 0xa5a5a5a5U, 0xe5e5e5e5U, 0xf1f1f1f1U, 0x71717171U, 0xd8d8d8d8U, 0x31313131U, 0x15151515U,
    0x04040404U, 0xc7c7c7c7U, 0x23232323U, 0xc3c3c3c3U, 0x18181818U, 0x96969696U, 0x05050505U, 0x9a9a9a9aU,
    0x07070707U, 0x12121212U, 0x80808080U, 0xe2e2e2e2U, 0xebebebebU, 0x27272727U, 0xb2b2b2b2U, 0x75757575U,
    0x09090909U, 0x83838383U, 0x2c2c2c2cU, 0x1a1a1a1aU, 0x1b1b1b1bU, 0x6e6e6e6eU, 0x5a5a5a5aU, 0xa0a0a0a0U,
    0x52525252U, 0x3b3b3b3bU, 0xd6d6d6d6U, 0xb3b3b3b3U, 0x29292929U, 0xe3e3e3e3U, 0x2f2f2f2fU, 0x84848484U,
    0x53535353U, 0xd1d1d1d1U, 0x00000000U, 0xededededU, 0x20202020U, 0xfcfcfcfcU, 0xb1b1b1b1U, 0x5b5b5b5bU,
    0x6a6a6a6aU, 0xcbcbcbcbU, 0xbebebebeU, 0x39393939U, 0x4a4a4a4aU, 0x4c4c4c4cU, 0x58585858U, 0xcfcfcfcfU,
    0xd0d0d0d0U, 0xefefefefU, 0xaaaaaaaaU, 0xfbfbfbfbU, 0x43434343U, 0x4d4d4d4dU, 0x33333333U, 0x85858585U,
    0x45454545U, 0xf9f9f9f9U, 0x02020202U, 0x7f7f7f7fU, 0x50505050U, 0x3c3c3c3cU, 0x9f9f9f9fU, 0xa8a8a8a8U,
    0x51515151U, 0xa3a3a3a3U, 0x40404040U, 0x8f8f8f8fU, 0x92929292U, 0x9d9d9d9dU, 0x38383838U, 0xf5f5f5f5U,
    0xbcbcbcbcU, 0xb6b6b6b6U, 0xdadadadaU, 0x21212121U, 0x10101010U, 0xffffffffU, 0xf3f3f3f3U, 0xd2d2d2d2U,
    0xcdcdcdcdU, 0x0c0c0c0cU, 0x13131313U, 0xececececU, 0x5f5f5f5fU, 0x97979797U, 0x44444444U, 0x17171717U,
    0xc4c4c4c4U, 0xa7a7a7a7U, 0x7e7e7e7eU, 0x3d3d3d3dU, 0x64646464U, 0x5d5d5d5dU, 0x19191919U, 0x73737373U,
    0x60606060U, 0x81818181U, 0x4f4f4f4fU, 0xdcdcdcdcU, 0x22222222U, 0x2a2a2a2aU, 0x90909090U, 0x88888888U,
    0x46464646U, 0xeeeeeeeeU, 0xb8b8b8b8U, 0x14141414U, 0xdedededeU, 0x5e5e5e5eU, 0x0b0b0b0bU, 0xdbdbdbdbU,
    0xe0e0e0e0U, 0x32323232U, 0x3a3a3a3aU, 0x0a0a0a0aU, 0x49494949U, 0x06060606U, 0x24242424U, 0x5c5c5c5cU,
    0xc2c2c2c2U, 0xd3d3d3d3U, 0xacacacacU, 0x62626262U, 0x91919191U, 0x95959595U, 0xe4e4e4e4U, 0x79797979U,
    0xe7e7e7e7U, 0xc8c8c8c8U, 0x37373737U, 0x6d6d6d6dU, 0x8d8d8d8dU, 0xd5d5d5d5U, 0x4e4e4e4eU, 0xa9a9a9a9U,
    0x6c6c6c6cU, 0x56565656U, 0xf4f4f4f4U, 0xeaeaeaeaU, 0x65656565U, 0x7a7a7a7aU, 0xaeaeaeaeU, 0x08080808U,
    0xbabababaU, 0x78787878U, 0x25252525U, 0x2e2e2e2eU, 0x1c1c1c1cU, 0xa6a6a6a6U, 0xb4b4b4b4U, 0xc6c6c6c6U,
    0xe8e8e8e8U, 0xddddddddU, 0x74747474U, 0x1f1f1f1fU, 0x4b4b4b4bU, 0xbdbdbdbdU, 0x8b8b8b8bU, 0x8a8a8a8aU,
    0x70707070U, 0x3e3e3e3eU, 0xb5b5b5b5U, 0x66666666U, 0x48484848U, 0x03030303U, 0xf6f6f6f6U, 0x0e0e0e0eU,
    0x61616161U, 0x35353535U, 0x57575757U, 0xb9b9b9b9U, 0x86868686U, 0xc1c1c1c1U, 0x1d1d1d1dU, 0x9e9e9e9eU,
    0xe1e1e1e1U, 0xf8f8f8f8U, 0x98989898U, 0x11111111U, 0x69696969U, 0xd9d9d9d9U, 0x8e8e8e8eU, 0x94949494U,
    0x9b9b9b9bU, 0x1e1e1e1eU, 0x87878787U, 0xe9e9e9e9U, 0xcecececeU, 0x55555555U, 0x28282828U, 0xdfdfdfdfU,
    0x8c8c8c8cU, 0xa1a1a1a1U, 0x89898989U, 0x0d0d0d0dU, 0xbfbfbfbfU, 0xe6e6e6e6U, 0x42424242U, 0x68686868U,
    0x41414141U, 0x99999999U, 0x2d2d2d2dU, 0x0f0f0f0fU, 0xb0b0b0b0U, 0x54545454U, 0xbbbbbbbbU, 0x16161616U
};

// Td0[x] = Si[x].[0e, 09, 0d, 0b];
static const uint32_t Td0[256] = {
    0x51f4a750U, 0x7e416553U, 0x1a17a4c3U, 0x3a275e96U, 0x3bab6bcbU, 0x1f9d45f1U, 0xacfa58abU, 0x4be30393U,
    0x2030fa55U, 0xad766df6U, 0x88cc7691U, 0xf5024c25U, 0x4fe5d7fcU, 0xc52acbd7U, 0x26354480U, 0xb562a38fU,
    0xdeb15a49U, 0x25ba1b67U, 0x45ea0e98U, 0x5dfec0e1U, 0xc32f7502U, 0x814cf012U, 0x8d4697a3U, 0x6bd3f9c6U,
    0x038f5fe7U, 0x15929c95U, 0xbf6d7aebU, 0x955259daU, 0xd4be832dU, 0x587421d3U, 0x49e06929U, 0x8ec9c844U,
    0x75c2896aU, 0xf48e7978U, 0x99583e6bU, 0x27b971ddU, 0xbee14fb6U, 0xf088ad17U, 0xc920ac66U, 0x7dce3ab4U,
    0x63df4a18U, 0xe51a3182U, 0x97513360U, 0x62537f45U, 0xb16477e0U, 0xbb6bae84U, 0xfe81a01cU, 0xf9082b94U,
    0x70486858U, 0x8f45fd19U, 0x94de6c87U, 0x527bf8b7U, 0xab73d323U, 0x724b02e2U, 0xe31f8f57U, 0x6655ab2aU,
    0xb2eb2807U, 0x2fb5c203U, 0x86c57b9aU, 0xd33708a5U, 0x302887f2U, 0x23bfa5b2U, 0x02036abaU, 0xed16825cU,
    0x8acf1c2bU, 0xa779b492U, 0xf307f2f0U, 0x4e69e2a1U, 0x65daf4cdU, 0x0605bed5U, 0xd134621fU, 0xc4a6fe8aU,
    0x342e539dU, 0xa2f355a0U, 0x058ae132U, 0xa4f6eb75U, 0x0b83ec39U, 0x4060efaaU, 0x5e719f06U, 0xbd6e1051U,
    0x3e218af9U, 0x96dd063dU, 0xdd3e05aeU, 0x4de6bd46U, 0x91548db5U, 0x71c45d05U, 0x0406d46fU, 0x605015ffU,
    0x1998fb24U, 0xd6bde997U, 0x894043ccU, 0x67d99e77U, 0xb0e842bdU, 0x07898b88U, 0xe7195b38U, 0x79c8eedbU,
    0xa17c0a47U, 0x7c420fe9U, 0xf8841ec9U, 0x00000000U, 0x09808683U, 0x322bed48U, 0x1e1170acU, 0x6c5a724eU,
    0xfd0efffbU, 0x0f853856U, 0x3daed51eU, 0x362d3927U, 0x0a0fd964U, 0x685ca621U, 0x9b5b54d1U, 0x24362e3aU,
    0x0c0a67b1U, 0x9357e70fU, 0xb4ee96d2U, 0x1b9b919eU, 0x80c0c54fU, 0x61dc20a2U, 0x5a774b69U, 0x1c121a16U,
    0xe293ba0aU, 0xc0a02ae5U, 0x3c22e043U, 0x121b171dU, 0x0e090d0bU, 0xf28bc7adU, 0x2db6a8b9U, 0x141ea9c8U,
    0x57f11985U, 0xaf75074cU, 0xee99ddbbU, 0xa37f60fdU, 0xf701269fU, 0x5c72f5bcU, 0x44663bc5U, 0x5bfb7e34U,
    0x8b432976U, 0xcb23c6dcU, 0xb6edfc68U, 0xb8e4f163U, 0xd731dccaU, 0x42638510U, 0x13972240U, 0x84c61120U,
    0x854a247dU, 0xd2bb3df8U, 0xaef93211U, 0xc729a16dU, 0x1d9e2f4bU, 0xdcb230f3U, 0x0d8652ecU, 0x77c1e3d0U,
    0x2bb3166cU, 0xa970b999U, 0x119448faU, 0x47e96422U, 0xa8fc8cc4U, 0xa0f03f1aU, 0x567d2cd8U, 0x223390efU,
    0x87494ec7U, 0xd938d1c1U, 0x8ccaa2feU, 0x98d40b36U, 0xa6f581cfU, 0xa57ade28U, 0xdab78e26U, 0x3fadbfa4U,
    0x2c3a9de4U, 0x5078920dU, 0x6a5fcc9bU, 0x547e4662U, 0xf68d13c2U, 0x90d8b8e8U, 0x2e39f75eU, 0x82c3aff5U,
    0x9f5d80beU, 0x69d0937cU, 0x6fd52da9U, 0xcf2512b3U, 0xc8ac993bU, 0x10187da7U, 0xe89c636eU, 0xdb3bbb7bU,
    0xcd267809U, 0x6e5918f4U, 0xec9ab701U, 0x834f9aa8U, 0xe6956e65U, 0xaaffe67eU, 0x21bccf08U, 0xef15e8e6U,
    0xbae79bd9U, 0x4a6f36ceU, 0xea9f09d4U, 0x29b07cd6U, 0x31a4b2afU, 0x2a3f2331U, 0xc6a59430U, 0x35a266c0U,
    0x744ebc37U, 0xfc82caa6U, 0xe090d0b0U, 0x33a7d815U, 0xf104984aU, 0x41ecdaf7U, 0x7fcd500eU, 0x1791f62fU,
    0x764dd68dU, 0x43efb04dU, 0xccaa4d54U, 0xe49604dfU, 0x9ed1b5e3U, 0x4c6a881bU, 0xc12c1fb8U, 0x4665517fU,
    0x9d5eea04U, 0x018c355dU, 0xfa877473U, 0xfb0b412eU, 0xb3671d5aU, 0x92dbd252U, 0xe9105633U, 0x6dd64713U,
    0x9ad7618cU, 0x37a10c7aU, 0x59f8148eU, 0xeb133c89U, 0xcea927eeU, 0xb761c935U, 0xe11ce5edU, 0x7a47b13cU,
    0x9cd2df59U, 0x55f2733fU, 0x1814ce79U, 0x73c737bfU, 0x53f7cdeaU, 0x5ffdaa5bU, 0xdf3d6f14U, 0x7844db86U,
    0xcaaff381U, 0xb968c43eU, 0x3824342cU, 0xc2a3405fU, 0x161dc372U, 0xbce2250cU, 0x283c498bU, 0xff0d9541U,
    0x39a80171U, 0x080cb3deU, 0xd8b4e49cU, 0x6456c190U, 0x7bcb8461U, 0xd532b670U, 0x486c5c74U, 0xd0b85742U
};

// Td1[x] = Si[x].[0b, 0e, 09, 0d];
static const uint32_t Td1[256] = {
    0x5051f4a7U, 0x537e4165U, 0xc31a17a4U, 0x963a275eU, 0xcb3bab6bU, 0xf11f9d45U, 0xabacfa58U, 0x934be303U,
    0x552030faU, 0xf6ad766dU, 0x9188cc76U, 0x25f5024cU, 0xfc4fe5d7U, 0xd7c52acbU, 0x80263544U, 0x8fb562a3U,
    0x49deb15aU, 0x6725ba1bU, 0x9845ea0eU, 0xe15dfec0U, 0x02c32f75U, 0x12814cf0U, 0xa38d4697U, 0xc66bd3f9U,
    0xe7038f5fU, 0x9515929cU, 0xebbf6d7aU, 0xda955259U, 0x2dd4be83U, 0xd3587421U, 0x2949e069U, 0x448ec9c8U,
    0x6a75c289U, 0x78f48e79U, 0x6b99583eU, 0xdd27b971U, 0xb6bee14fU, 0x17f088adU, 0x66c920acU, 0xb47dce3aU,
    0x1863df4aU, 0x82e51a31U, 0x60975133U, 0x4562537fU, 0xe0b16477U, 0x84bb6baeU, 0x1cfe81a0U, 0x94f9082bU,
    0x58704868U, 0x198f45fdU, 0x8794de6cU, 0xb7527bf8U, 0x23ab73d3U, 0xe2724b02U, 0x57e31f8fU, 0x2a6655abU,
    0x07b2eb28U, 0x032fb5c2U, 0x9a86c57bU, 0xa5d33708U, 0xf2302887U, 0xb223bfa5U, 0xba02036aU, 0x5ced1682U,
    0x2b8acf1cU, 0x92a779b4U, 0xf0f307f2U, 0xa14e69e2U, 0xcd65daf4U, 0xd50605beU, 0x1fd13462U, 0x8ac4a6feU,
    0x9d342e53U, 0xa0a2f355U, 0x32058ae1U, 0x75a4f6ebU, 0x390b83ecU, 0xaa4060efU, 0x065e719fU, 0x51bd6e10U,
    0xf93e218aU, 0x3d96dd06U, 0xaedd3e05U, 0x464de6bdU, 0xb591548dU, 0x0571c45dU, 0x6f0406d4U, 0xff605015U,
    0x241998fbU, 0x97d6bde9U, 0xcc894043U, 0x7767d99eU, 0xbdb0e842U, 0x8807898bU, 0x38e7195bU, 0xdb79c8eeU,
    0x47a17c0aU, 0xe97c420fU, 0xc9f8841eU, 0x00000000U, 0x83098086U, 0x48322bedU, 0xac1e1170U, 0x4e6c5a72U,
    0xfbfd0effU, 0x560f8538U, 0x1e3daed5U, 0x27362d39U, 0x640a0fd9U, 0x21685ca6U, 0xd19b5b54U, 0x3a24362eU,
    0xb10c0a67U, 0x0f9357e7U, 0xd2b4ee96U, 0x9e1b9b91U, 0x4f80c0c5U, 0xa261dc20U, 0x695a774bU, 0x161c121aU,
    0x0ae293baU, 0xe5c0a02aU, 0x433c22e0U, 0x1d121b17U, 0x0b0e090dU, 0xadf28bc7U, 0xb92db6a8U, 0xc8141ea9U,
    0x8557f119U, 0x4caf7507U, 0xbbee99ddU, 0xfda37f60U, 0x9ff70126U, 0xbc5c72f5U, 0xc544663bU, 0x345bfb7eU,
    0x768b4329U, 0xdccb23c6U, 0x68b6edfcU, 0x63b8e4f1U, 0xcad731dcU, 0x10426385U, 0x40139722U, 0x2084c611U,
    0x7d854a24U, 0xf8d2bb3dU, 0x11aef932U, 0x6dc729a1U, 0x4b1d9e2fU, 0xf3dcb230U, 0xec0d8652U, 0xd077c1e3U,
    0x6c2bb316U, 0x99a970b9U, 0xfa119448U, 0x2247e964U, 0xc4a8fc8cU, 0x1aa0f03fU, 0xd8567d2cU, 0xef223390U,
    0xc787494eU, 0xc1d938d1U, 0xfe8ccaa2U, 0x3698d40bU, 0xcfa6f581U, 0x28a57adeU, 0x26dab78eU, 0xa43fadbfU,
    0xe42c3a9dU, 0x0d507892U, 0x9b6a5fccU, 0x62547e46U, 0xc2f68d13U, 0xe890d8b8U, 0x5e2e39f7U, 0xf582c3afU,
    0xbe9f5d80U, 0x7c69d093U, 0xa96fd52dU, 0xb3cf2512U, 0x3bc8ac99U, 0xa710187dU, 0x6ee89c63U, 0x7bdb3bbbU,
    0x09cd2678U, 0xf46e5918U, 0x01ec9ab7U, 0xa8834f9aU, 0x65e6956eU, 0x7eaaffe6U, 0x0821bccfU, 0xe6ef15e8U,
    0xd9bae79bU, 0xce4a6f36U, 0xd4ea9f09U, 0xd629b07cU, 0xaf31a4b2U, 0x312a3f23U, 0x30c6a594U, 0xc035a266U,
    0x37744ebcU, 0xa6fc82caU, 0xb0e090d0U, 0x1533a7d8U, 0x4af10498U, 0xf741ecdaU, 0x0e7fcd50U, 0x2f1791f6U,
    0x8d764dd6U, 0x4d43efb0U, 0x54ccaa4dU, 0xdfe49604U, 0xe39ed1b5U, 0x1b4c6a88U, 0xb8c12c1fU, 0x7f466551U,
    0x049d5eeaU, 0x5d018c35U, 0x73fa8774U, 0x2efb0b41U, 0x5ab3671dU, 0x5292dbd2U, 0x33e91056U, 0x136dd647U,
    0x8c9ad761U, 0x7a37a10cU, 0x8e59f814U, 0x89eb133cU, 0xeecea927U, 0x35b761c9U, 0xede11ce5U, 0x3c7a47b1U,
    0x599cd2dfU, 0x3f55f273U, 0x791814ceU, 0xbf73c737U, 0xea53f7cdU, 0x5b5ffdaaU, 0x14df3d6fU, 0x867844dbU,
    0x81caaff3U, 0x3eb968c4U, 0x2c382434U, 0x5fc2a340U, 0x72161dc3U, 0x0cbce225U, 0x8b283c49U, 0x41ff0d95U,
    0x7139a801U, 0xde080cb3U, 0x9cd8b4e4U, 0x906456c1U, 0x617bcb84U, 0x70d532b6U, 0x74486c5cU, 0x42d0b857U
};

// Td2[x] = Si[x].[0d, 0b, 0e, 09];
static const uint32_t Td2[256] = {
    0xa75051f4U, 0x65537e41U, 0xa4c31a17U, 0x5e963a27U, 0x6bcb3babU, 0x45f11f9dU, 0x58abacfaU, 0x03934be3U,
    0xfa552030U, 0x6df6ad76U, 0x769188ccU, 0x4c25f502U, 0xd7fc4fe5U, 0xcbd7c52aU, 0x44802635U, 0xa38fb562U,
    0x5a49deb1U, 0x1b6725baU, 0x0e9845eaU, 0xc0e15dfeU, 0x7502c32fU, 0xf012814cU, 0x97a38d46U, 0xf9c66bd3U,
    0x5fe7038fU, 0x9c951592U, 0x7aebbf6dU, 0x59da9552U, 0x832dd4beU, 0x21d35874U, 0x692949e0U, 0xc8448ec9U,
    0x896a75c2U, 0x7978f48eU, 0x3e6b9958U, 0x71dd27b9U, 0x4fb6bee1U, 0xad17f088U, 0xac66c920U, 0x3ab47dceU,
    0x4a1863dfU, 0x3182e51aU, 0x33609751U, 0x7f456253U, 0x77e0b164U, 0xae84bb6bU, 0xa01cfe81U, 0x2b94f908U,
    0x68587048U, 0xfd198f45U, 0x6c8794deU, 0xf8b7527bU, 0xd323ab73U, 0x02e2724bU, 0x8f57e31fU, 0xab2a6655U,
    0x2807b2ebU, 0xc2032fb5U, 0x7b9a86c5U, 0x08a5d337U, 0x87f23028U, 0xa5b223bfU, 0x6aba0203U, 0x825ced16U,
    0x1c2b8acfU, 0xb492a779U, 0xf2f0f307U, 0xe2a14e69U, 0xf4cd65daU, 0xbed50605U, 0x621fd134U, 0xfe8ac4a6U,
    0x539d342eU, 0x55a0a2f3U, 0xe132058aU, 0xeb75a4f6U, 0xec390b83U, 0xefaa4060U, 0x9f065e71U, 0x1051bd6eU,
    0x8af93e21U, 0x063d96ddU, 0x05aedd3eU, 0xbd464de6U, 0x8db59154U, 0x5d0571c4U, 0xd46f0406U, 0x15ff6050U,
    0xfb241998U, 0xe997d6bdU, 0x43cc8940U, 0x9e7767d9U, 0x42bdb0e8U, 0x8b880789U, 0x5b38e719U, 0xeedb79c8U,
    0x0a47a17cU, 0x0fe97c42U, 0x1ec9f884U, 0x00000000U, 0x86830980U, 0xed48322bU, 0x70ac1e11U, 0x724e6c5aU,
    0xfffbfd0eU, 0x38560f85U, 0xd51e3daeU, 0x3927362dU, 0xd9640a0fU, 0xa621685cU, 0x54d19b5bU, 0x2e3a2436U,
    0x67b10c0aU, 0xe70f9357U, 0x96d2b4eeU, 0x919e1b9bU, 0xc54f80c0U, 0x20a261dcU, 0x4b695a77U, 0x1a161c12U,
    0xba0ae293U, 0x2ae5c0a0U, 0xe0433c22U, 0x171d121bU, 0x0d0b0e09U, 0xc7adf28bU, 0xa8b92db6U, 0xa9c8141eU,
    0x198557f1U, 0x074caf75U, 0xddbbee99U, 0x60fda37fU, 0x269ff701U, 0xf5bc5c72U, 0x3bc54466U, 0x7e345bfbU,
    0x29768b43U, 0xc6dccb23U, 0xfc68b6edU, 0xf163b8e4U, 0xdccad731U, 0x85104263U, 0x22401397U, 0x112084c6U,
    0x247d854aU, 0x3df8d2bbU, 0x3211aef9U, 0xa16dc729U, 0x2f4b1d9eU, 0x30f3dcb2U, 0x52ec0d86U, 0xe3d077c1U,
    0x166c2bb3U, 0xb999a970U, 0x48fa1194U, 0x642247e9U, 0x8cc4a8fcU, 0x3f1aa0f0U, 0x2cd8567dU, 0x90ef2233U,
    0x4ec78749U, 0xd1c1d938U, 0xa2fe8ccaU, 0x0b3698d4U, 0x81cfa6f5U, 0xde28a57aU, 0x8e26dab7U, 0xbfa43fadU,
    0x9de42c3aU, 0x920d5078U, 0xcc9b6a5fU, 0x4662547eU, 0x13c2f68dU, 0xb8e890d8U, 0xf75e2e39U, 0xaff582c3U,
    0x80be9f5dU, 0x937c69d0U, 0x2da96fd5U, 0x12b3cf25U, 0x993bc8acU, 0x7da71018U, 0x636ee89cU, 0xbb7bdb3bU,
    0x7809cd26U, 0x18f46e59U, 0xb701ec9aU, 0x9aa8834fU, 0x6e65e695U, 0xe67eaaffU, 0xcf0821bcU, 0xe8e6ef15U,
    0x9bd9bae7U, 0x36ce4a6fU, 0x09d4ea9fU, 0x7cd629b0U, 0xb2af31a4U, 0x23312a3fU, 0x9430c6a5U, 0x66c035a2U,
    0xbc37744eU, 0xcaa6fc82U, 0xd0b0e090U, 0xd81533a7U, 0x984af104U, 0xdaf741ecU, 0x500e7fcdU, 0xf62f1791U,
    0xd68d764dU, 0xb04d43efU, 0x4d54ccaaU, 0x04dfe496U, 0xb5e39ed1U, 0x881b4c6aU, 0x1fb8c12cU, 0x517f4665U,
    0xea049d5eU, 0x355d018cU, 0x7473fa87U, 0x412efb0bU, 0x1d5ab367U, 0xd25292dbU, 0x5633e910U, 0x47136dd6U,
    0x618c9ad7U, 0x0c7a37a1U, 0x148e59f8U, 0x3c89eb13U, 0x27eecea9U, 0xc935b761U, 0xe5ede11cU, 0xb13c7a47U,
    0xdf599cd2U, 0x733f55f2U, 0xce791814U, 0x37bf73c7U, 0xcdea53f7U, 0xaa5b5ffdU, 0x6f14df3dU, 0xdb867844U,
    0xf381caafU, 0xc43eb968U, 0x342c3824U, 0x405fc2a3U, 0xc372161dU, 0x250cbce2U, 0x498b283cU, 0x9541ff0dU,
    0x017139a8U, 0xb3de080cU, 0xe49cd8b4U, 0xc1906456U, 0x84617bcbU, 0xb670d532U, 0x5c74486cU, 0x5742d0b8U
};

// Td3[x] = Si[x].[09, 0d, 0b, 0e];
static const uint32_t Td3[256] = {
    0xf4a75051U, 0x4165537eU, 0x17a4c31aU, 0x275e963aU, 0xab6bcb3bU, 0x9d45f11fU, 0xfa58abacU, 0xe303934bU,
    0x30fa5520U, 0x766df6adU, 0xcc769188U, 0x024c25f5U, 0xe5d7fc4fU, 0x2acbd7c5U, 0x35448026U, 0x62a38fb5U,
    0xb15a49deU, 0xba1b6725U, 0xea0e9845U, 0xfec0e15dU, 0x2f7502c3U, 0x4cf01281U, 0x4697a38dU, 0xd3f9c66bU,
    0x8f5fe703U, 0x929c9515U, 0x6d7aebbfU, 0x5259da95U, 0xbe832dd4U, 0x7421d358U, 0xe0692949U, 0xc9c8448eU,
    0xc2896a75U, 0x8e7978f4U, 0x583e6b99U, 0xb971dd27U, 0xe14fb6beU, 0x88ad17f0U, 0x20ac66c9U, 0xce3ab47dU,
    0xdf4a1863U, 0x1a3182e5U, 0x51336097U, 0x537f4562U, 0x6477e0b1U, 0x6bae84bbU, 0x81a01cfeU, 0x082b94f9U,
    0x48685870U, 0x45fd198fU, 0xde6c8794U, 0x7bf8b752U, 0x73d323abU, 0x4b02e272U, 0x1f8f57e3U, 0x55ab2a66U,
    0xeb2807b2U, 0xb5c2032fU, 0xc57b9a86U, 0x3708a5d3U, 0x2887f230U, 0xbfa5b223U, 0x036aba02U, 0x16825cedU,
    0xcf1c2b8aU, 0x79b492a7U, 0x07f2f0f3U, 0x69e2a14eU, 0xdaf4cd65U, 0x05bed506U, 0x34621fd1U, 0xa6fe8ac4U,
    0x2e539d34U, 0xf355a0a2U, 0x8ae13205U, 0xf6eb75a4U, 0x83ec390bU, 0x60efaa40U, 0x719f065eU, 0x6e1051bdU,
    0x218af93eU, 0xdd063d96U, 0x3e05aeddU, 0xe6bd464dU, 0x548db591U, 0xc45d0571U, 0x06d46f04U, 0x5015ff60U,
    0x98fb2419U, 0xbde997d6U, 0x4043cc89U, 0xd99e7767U, 0xe842bdb0U, 0x898b8807U, 0x195b38e7U, 0xc8eedb79U,
    0x7c0a47a1U, 0x420fe97cU, 0x841ec9f8U, 0x00000000U, 0x80868309U, 0x2bed4832U, 0x1170ac1eU, 0x5a724e6cU,
    0x0efffbfdU, 0x8538560fU, 0xaed51e3dU, 0x2d392736U, 0x0fd9640aU, 0x5ca62168U, 0x5b54d19bU, 0x362e3a24U,
    0x0a67b10cU, 0x57e70f93U, 0xee96d2b4U, 0x9b919e1bU, 0xc0c54f80U, 0xdc20a261U, 0x774b695aU, 0x121a161cU,
    0x93ba0ae2U, 0xa02ae5c0U, 0x22e0433cU, 0x1b171d12U, 0x090d0b0eU, 0x8bc7adf2U, 0xb6a8b92dU, 0x1ea9c814U,
    0xf1198557U, 0x75074cafU, 0x99ddbbeeU, 0x7f60fda3U, 0x01269ff7U, 0x72f5bc5cU, 0x663bc544U, 0xfb7e345bU,
    0x4329768bU, 0x23c6dccbU, 0xedfc68b6U, 0xe4f163b8U, 0x31dccad7U, 0x63851042U, 0x97224013U, 0xc6112084U,
    0x4a247d85U, 0xbb3df8d2U, 0xf93211aeU, 0x29a16dc7U, 0x9e2f4b1dU, 0xb230f3dcU, 0x8652ec0dU, 0xc1e3d077U,
    0xb3166c2bU, 0x70b999a9U, 0x9448fa11U, 0xe9642247U, 0xfc8cc4a8U, 0xf03f1aa0U, 0x7d2cd856U, 0x3390ef22U,
    0x494ec787U, 0x38d1c1d9U, 0xcaa2fe8cU, 0xd40b3698U, 0xf581cfa6U, 0x7ade28a5U, 0xb78e26daU, 0xadbfa43fU,
    0x3a9de42cU, 0x78920d50U, 0x5fcc9b6aU, 0x7e466254U, 0x8d13c2f6U, 0xd8b8e890U, 0x39f75e2eU, 0xc3aff582U,
    0x5d80be9fU, 0xd0937c69U, 0xd52da96fU, 0x2512b3cfU, 0xac993bc8U, 0x187da710U, 0x9c636ee8U, 0x3bbb7bdbU,
    0x267809cdU, 0x5918f46eU, 0x9ab701ecU, 0x4f9aa883U, 0x956e65e6U, 0xffe67eaaU, 0xbccf0821U, 0x15e8e6efU,
    0xe79bd9baU, 0x6f36ce4aU, 0x9f09d4eaU, 0xb07cd629U, 0xa4b2af31U, 0x3f23312aU, 0xa59430c6U, 0xa266c035U,
    0x4ebc3774U, 0x82caa6fcU, 0x90d0b0e0U, 0xa7d81533U, 0x04984af1U, 0xecdaf741U, 0xcd500e7fU, 0x91f62f17U,
    0x4dd68d76U, 0xefb04d43U, 0xaa4d54ccU, 0x9604dfe4U, 0xd1b5e39eU, 0x6a881b4cU, 0x2c1fb8c1U, 0x65517f46U,
    0x5eea049dU, 0x8c355d01U, 0x877473faU, 0x0b412efbU, 0x671d5ab3U, 0xdbd25292U, 0x105633e9U, 0xd647136dU,
    0xd7618c9aU, 0xa10c7a37U, 0xf8148e59U, 0x133c89ebU, 0xa927eeceU, 0x61c935b7U, 0x1ce5ede1U, 0x47b13c7aU,
    0xd2df599cU, 0xf2733f55U, 0x14ce7918U, 0xc737bf73U, 0xf7cdea53U, 0xfdaa5b5fU, 0x3d6f14dfU, 0x44db8678U,
    0xaff381caU, 0x68c43eb9U, 0x24342c38U, 0xa3405fc2U, 0x1dc37216U, 0xe2250cbcU, 0x3c498b28U, 0x0d9541ffU,
    0xa8017139U, 0x0cb3de08U, 0xb4e49cd8U, 0x56c19064U, 0xcb84617bU, 0x32b670d5U, 0x6c5c7448U, 0xb85742d0U
};

// Td4[x] = Si[x].[01, 01, 01, 01];
static const uint32_t Td4[256] = {
    0x52525252U, 0x09090909U, 0x6a6a6a6aU, 0xd5d5d5d5U, 0x30303030U, 0x36363636U, 0xa5a5a5a5U, 0x38383838U,
    0xbfbfbfbfU, 0x40404040U, 0xa3a3a3a3U, 0x9e9e9e9eU, 0x81818181U, 0xf3f3f3f3U, 0xd7d7d7d7U, 0xfbfbfbfbU,
    0x7c7c7c7cU, 0xe3e3e3e3U, 0x39393939U, 0x82828282U, 0x9b9b9b9bU, 0x2f2f2f2fU, 0xffffffffU, 0x87878787U,
    0x34343434U, 0x8e8e8e8eU, 0x43434343U, 0x44444444U, 0xc4c4c4c4U, 0xdedededeU, 0xe9e9e9e9U, 0xcbcbcbcbU,
    0x54545454U, 0x7b7b7b7bU, 0x94949494U, 0x32323232U, 0xa6a6a6a6U, 0xc2c2c2c2U, 0x23232323U, 0x3d3d3d3dU,
    0xeeeeeeeeU, 0x4c4c4c4cU, 0x95959595U, 0x0b0b0b0bU, 0x42424242U, 0xfafafafaU, 0xc3c3c3c3U, 0x4e4e4e4eU,
    0x08080808U, 0x2e2e2e2eU, 0xa1a1a1a1U, 0x66666666U, 0x28282828U, 0xd9d9d9d9U, 0x24242424U, 0xb2b2b2b2U,
    0x76767676U, 0x5b5b5b5bU, 0xa2a2a2a2U, 0x49494949U, 0x6d6d6d6dU, 0x8b8b8b8bU, 0xd1d1d1d1U, 0x25252525U,
    0x72727272U, 0xf8f8f8f8U, 0xf6f6f6f6U, 0x64646464U, 0x86868686U, 0x68686868U, 0x98989898U, 0x16161616U,
    0xd4d4d4d4U, 0xa4a4a4a4U, 0x5c5c5c5cU, 0xccccccccU, 0x5d5d5d5dU, 0x65656565U, 0xb6b6b6b6U, 0x92929292U,
    0x6c6c6c6cU, 0x70707070U, 0x48484848U, 0x50505050U, 0xfdfdfdfdU, 0xededededU, 0xb9b9b9b9U, 0xdadadadaU,
    0x5e5e5e5eU, 0x15151515U, 0x46464646U, 0x57575757U, 0xa7a7a7a7U, 0x8d8d8d8dU, 0x9d9d9d9dU, 0x84848484U,
    0x90909090U, 0xd8d8d8d8U, 0xababababU, 0x00000000U, 0x8c8c8c8cU, 0xbcbcbcbcU, 0xd3d3d3d3U, 0x0a0a0a0aU,
    0xf7f7f7f7U, 0xe4e4e4e4U, 0x58585858U, 0x05050505U, 0xb8b8b8b8U, 0xb3b3b3b3U, 0x45454545U, 0x06060606U,
    0xd0d0d0d0U, 0x2c2c2c2cU, 0x1e1e1e1eU, 0x8f8f8f8fU, 0xcacacacaU, 0x3f3f3f3fU, 0x0f0f0f0fU, 0x02020202U,
    0xc1c1c1c1U, 0xafafafafU, 0xbdbdbdbdU, 0x03030303U, 0x01010101U, 0x13131313U, 0x8a8a8a8aU, 0x6b6b6b6bU,
    0x3a3a3a3aU, 0x91919191U, 0x11111111U, 0x41414141U, 0x4f4f4f4fU, 0x67676767U, 0xdcdcdcdcU, 0xeaeaeaeaU,
    0x97979797U, 0xf2f2f2f2U, 0xcfcfcfcfU, 0xcecececeU, 0xf0f0f0f0U, 0xb4b4b4b4U, 0xe6e6e6e6U, 0x73737373U,
    0x96969696U, 0xacacacacU, 0x74747474U, 0x22222222U, 0xe7e7e7e7U, 0xadadadadU, 0x35353535U, 0x85858585U,
    0xe2e2e2e2U, 0xf9f9f9f9U, 0x37373737U, 0xe8e8e8e8U, 0x1c1c1c1cU, 0x75757575U, 0xdfdfdfdfU, 0x6e6e6e6eU,
    0x47474747U, 0xf1f1f1f1U, 0x1a1a1a1aU, 0x71717171U, 0x1d1d1d1dU, 0x29292929U, 0xc5c5c5c5U, 0x89898989U,
    0x6f6f6f6fU, 0xb7b7b7b7U, 0x62626262U, 0x0e0e0e0eU, 0xaaaaaaaaU, 0x18181818U, 0xbebebebeU, 0x1b1b1b1bU,
    0xfcfcfcfcU, 0x56565656U, 0x3e3e3e3eU, 0x4b4b4b4bU, 0xc6c6c6c6U, 0xd2d2d2d2U, 0x79797979U, 0x20202020U,
    0x9a9a9a9aU, 0xdbdbdbdbU, 0xc0c0c0c0U, 0xfefefefeU, 0x78787878U, 0xcdcdcdcdU, 0x5a5a5a5aU, 0xf4f4f4f4U,
    0x1f1f1f1fU, 0xddddddddU, 0xa8a8a8a8U, 0x33333333U, 0x88888888U, 0x07070707U, 0xc7c7c7c7U, 0x31313131U,
    0xb1b1b1b1U, 0x12121212U, 0x10101010U, 0x59595959U, 0x27272727U, 0x80808080U, 0xececececU, 0x5f5f5f5fU,
    0x60606060U, 0x51515151U, 0x7f7f7f7fU, 0xa9a9a9a9U, 0x19191919U, 0xb5b5b5b5U, 0x4a4a4a4aU, 0x0d0d0d0dU,
    0x2d2d2d2dU, 0xe5e5e5e5U, 0x7a7a7a7aU, 0x9f9f9f9fU, 0x93939393U, 0xc9c9c9c9U, 0x9c9c9c9cU, 0xefefefefU,
    0xa0a0a0a0U, 0xe0e0e0e0U, 0x3b3b3b3bU, 0x4d4d4d4dU, 0xaeaeaeaeU, 0x2a2a2a2aU, 0xf5f5f5f5U, 0xb0b0b0b0U,
    0xc8c8c8c8U, 0xebebebebU, 0xbbbbbbbbU, 0x3c3c3c3cU, 0x83838383U, 0x53535353U, 0x99999999U, 0x61616161U,
    0x17171717U, 0x2b2b2b2bU, 0x04040404U, 0x7e7e7e7eU, 0xbabababaU, 0x77777777U, 0xd6d6d6d6U, 0x26262626U,
    0xe1e1e1e1U, 0x69696969U, 0x14141414U, 0x63636363U, 0x55555555U, 0x21212121U, 0x0c0c0c0cU, 0x7d7d7d7dU
};

// for 128-bit blocks, Rijndael never uses more than 10 rcon values
static const uint32_t rcon[] = {
    0x01000000, 0x02000000, 0x04000000, 0x08000000,
    0x10000000, 0x20000000, 0x40000000, 0x80000000,
    0x1B000000, 0x36000000
};


#define GETU32(p) (be32toh((*((uint32_t*)(p)))))
#define PUTU32(ct, st) { *((uint32_t*)(ct)) = htobe32((st)); }

#define b0(x) ((uint8_t)(x))
#define b1(x) ((uint8_t)((x) >> 8))
#define b2(x) ((uint8_t)((x) >> 16))
#define b3(x) ((uint8_t)((x) >> 24))

#define m0(x) ((x) & 0x000000ff)
#define m1(x) ((x) & 0x0000ff00)
#define m2(x) ((x) & 0x00ff0000)
#define m3(x) ((x) & 0xff000000)


// expand the cipher key into the encryption key schedule and
// return the number of rounds for the given cipher key size
static int aes_internal_key_setup_enc (uint32_t rk[] /*4*(Nr + 1)*/, const uint8_t cipherKey[], int keyBits) {

    int i = 0;
    uint32_t temp;

    rk[0] = GETU32(cipherKey     );
    rk[1] = GETU32(cipherKey +  4);
    rk[2] = GETU32(cipherKey +  8);
    rk[3] = GETU32(cipherKey + 12);
    if(keyBits == 128) {
        for(;;) {
            temp  = rk[3];
            rk[4] = rk[0] ^
                    (Te4[b2(temp)] & 0xff000000) ^
                    (Te4[b1(temp)] & 0x00ff0000) ^
                    (Te4[b0(temp)] & 0x0000ff00) ^
                    (Te4[b3(temp)] & 0x000000ff) ^
                    rcon[i];
            rk[5] = rk[1] ^ rk[4];
            rk[6] = rk[2] ^ rk[5];
            rk[7] = rk[3] ^ rk[6];
            if(++i == 10) {
                return 10;
            }
            rk += 4;
        }
    }
    rk[4] = GETU32(cipherKey + 16);
    rk[5] = GETU32(cipherKey + 20);
    if(keyBits == 192) {
        for(;;) {
            temp = rk[ 5];
            rk[ 6] = rk[ 0] ^
                     (Te4[b2(temp)] & 0xff000000) ^
                     (Te4[b1(temp)] & 0x00ff0000) ^
                     (Te4[b0(temp)] & 0x0000ff00) ^
                     (Te4[b3(temp)] & 0x000000ff) ^
                     rcon[i];
            rk[ 7] = rk[ 1] ^ rk[ 6];
            rk[ 8] = rk[ 2] ^ rk[ 7];
            rk[ 9] = rk[ 3] ^ rk[ 8];
            if(++i == 8) {
                return 12;
            }
            rk[10] = rk[ 4] ^ rk[ 9];
            rk[11] = rk[ 5] ^ rk[10];
            rk += 6;
        }
    }
    rk[6] = GETU32(cipherKey + 24);
    rk[7] = GETU32(cipherKey + 28);
    if(keyBits == 256) {
        for(;;) {
            temp = rk[ 7];
            rk[ 8] = rk[ 0] ^
                     (Te4[b2(temp)] & 0xff000000) ^
                     (Te4[b1(temp)] & 0x00ff0000) ^
                     (Te4[b0(temp)] & 0x0000ff00) ^
                     (Te4[b3(temp)] & 0x000000ff) ^
                     rcon[i];
            rk[ 9] = rk[ 1] ^ rk[ 8];
            rk[10] = rk[ 2] ^ rk[ 9];
            rk[11] = rk[ 3] ^ rk[10];
            if(++i == 7) {
                return 14;
            }
            temp = rk[11];
            rk[12] = rk[ 4] ^
                     (Te4[b3(temp)] & 0xff000000) ^
                     (Te4[b2(temp)] & 0x00ff0000) ^
                     (Te4[b1(temp)] & 0x0000ff00) ^
                     (Te4[b0(temp)] & 0x000000ff);
            rk[13] = rk[ 5] ^ rk[12];
            rk[14] = rk[ 6] ^ rk[13];
            rk[15] = rk[ 7] ^ rk[14];
            rk += 8;
        }
    }

    return 0;
}


#define INVMIXCOLRK(n) rk[n] =  Td0[b0(Te4[b3(rk[n])])] ^ Td1[b0(Te4[b2(rk[n])])] ^ Td2[b0(Te4[b1(rk[n])])] ^ Td3[b0(Te4[b0(rk[n])])]


// expand the cipher key into the decryption key schedule and
// return the number of rounds for the given cipher key size
static int aes_internal_key_setup_dec (uint32_t rk[] /*4*(Nr + 1)*/, const uint8_t cipherKey[], int keyBits) {

    int Nr, i, j;
    uint32_t temp;

    // expand the cipher key
    Nr = aes_internal_key_setup_enc(rk, cipherKey, keyBits);
    // invert the order of the round keys
    for(i = 0, j = 4*Nr; i < j; i += 4, j -= 4) {
        temp = rk[i    ]; rk[i    ] = rk[j    ]; rk[j    ] = temp;
        temp = rk[i + 1]; rk[i + 1] = rk[j + 1]; rk[j + 1] = temp;
        temp = rk[i + 2]; rk[i + 2] = rk[j + 2]; rk[j + 2] = temp;
        temp = rk[i + 3]; rk[i + 3] = rk[j + 3]; rk[j + 3] = temp;
    }

    // apply the inverse MixColumn transform to all round keys but the first and the last
    for(i = 1; i < Nr; i++) {
        rk += 4;
        INVMIXCOLRK(0);
        INVMIXCOLRK(1);
        INVMIXCOLRK(2);
        INVMIXCOLRK(3);
    }

    return Nr;
}


#define AES_ENC_ROUND(DST, SRC, round) \
    DST ## 0 = Te0[b3(SRC ## 0)] ^ Te1[b2(SRC ## 1)] ^ Te2[b1(SRC ## 2)] ^ Te3[b0(SRC ## 3)] ^ rk[4 * round + 0]; \
    DST ## 1 = Te0[b3(SRC ## 1)] ^ Te1[b2(SRC ## 2)] ^ Te2[b1(SRC ## 3)] ^ Te3[b0(SRC ## 0)] ^ rk[4 * round + 1]; \
    DST ## 2 = Te0[b3(SRC ## 2)] ^ Te1[b2(SRC ## 3)] ^ Te2[b1(SRC ## 0)] ^ Te3[b0(SRC ## 1)] ^ rk[4 * round + 2]; \
    DST ## 3 = Te0[b3(SRC ## 3)] ^ Te1[b2(SRC ## 0)] ^ Te2[b1(SRC ## 1)] ^ Te3[b0(SRC ## 2)] ^ rk[4 * round + 3];


static void aes_internal_encrypt (const uint32_t rk[] /*4*(Nr + 1)*/, int Nr, const uint8_t pt[16], uint8_t ct[16]) {

    uint32_t s0, s1, s2, s3, t0, t1, t2, t3;

    // map byte array block to cipher state and add initial round key
    s0 = GETU32(pt     ) ^ rk[0];
    s1 = GETU32(pt +  4) ^ rk[1];
    s2 = GETU32(pt +  8) ^ rk[2];
    s3 = GETU32(pt + 12) ^ rk[3];

    AES_ENC_ROUND(t, s, 1);
    AES_ENC_ROUND(s, t, 2);
    AES_ENC_ROUND(t, s, 3);
    AES_ENC_ROUND(s, t, 4);
    AES_ENC_ROUND(t, s, 5);
    AES_ENC_ROUND(s, t, 6);
    AES_ENC_ROUND(t, s, 7);
    AES_ENC_ROUND(s, t, 8);
    AES_ENC_ROUND(t, s, 9);

    if(Nr > 10) {
        AES_ENC_ROUND(s, t, 10);
        AES_ENC_ROUND(t, s, 11);
        if(Nr > 12) {
            AES_ENC_ROUND(s, t, 12);
            AES_ENC_ROUND(t, s, 13);
        }
    }

    rk += Nr << 2;
    // apply last round and map cipher state to byte array block
    s0 = m3(Te4[b3(t0)]) ^ m2(Te4[b2(t1)]) ^ m1(Te4[b1(t2)]) ^ m0(Te4[b0(t3)]) ^ rk[0];
    PUTU32(ct, s0);
    s1 = m3(Te4[b3(t1)]) ^ m2(Te4[b2(t2)]) ^ m1(Te4[b1(t3)]) ^ m0(Te4[b0(t0)]) ^ rk[1];
    PUTU32(ct +  4, s1);
    s2 = m3(Te4[b3(t2)]) ^ m2(Te4[b2(t3)]) ^ m1(Te4[b1(t0)]) ^ m0(Te4[b0(t1)]) ^ rk[2];
    PUTU32(ct +  8, s2);
    s3 = m3(Te4[b3(t3)]) ^ m2(Te4[b2(t0)]) ^ m1(Te4[b1(t1)]) ^ m0(Te4[b0(t2)]) ^ rk[3];
    PUTU32(ct + 12, s3);
}


#define AES_DEC_ROUND(DST, SRC, round) \
    DST ## 0 = Td0[b3(SRC ## 0)] ^ Td1[b2(SRC ## 3)] ^ Td2[b1(SRC ## 2)] ^ Td3[b0(SRC ## 1)] ^ rk[4 * round + 0]; \
    DST ## 1 = Td0[b3(SRC ## 1)] ^ Td1[b2(SRC ## 0)] ^ Td2[b1(SRC ## 3)] ^ Td3[b0(SRC ## 2)] ^ rk[4 * round + 1]; \
    DST ## 2 = Td0[b3(SRC ## 2)] ^ Td1[b2(SRC ## 1)] ^ Td2[b1(SRC ## 0)] ^ Td3[b0(SRC ## 3)] ^ rk[4 * round + 2]; \
    DST ## 3 = Td0[b3(SRC ## 3)] ^ Td1[b2(SRC ## 2)] ^ Td2[b1(SRC ## 1)] ^ Td3[b0(SRC ## 0)] ^ rk[4 * round + 3];


static void aes_internal_decrypt (const uint32_t rk[] /*4*(Nr + 1)*/, int Nr, const uint8_t ct[16], uint8_t pt[16]) {

    uint32_t s0, s1, s2, s3, t0, t1, t2, t3;

    // map byte array block to cipher state and add initial round key
    s0 = GETU32(ct     ) ^ rk[0];
    s1 = GETU32(ct +  4) ^ rk[1];
    s2 = GETU32(ct +  8) ^ rk[2];
    s3 = GETU32(ct + 12) ^ rk[3];

    AES_DEC_ROUND(t, s, 1);
    AES_DEC_ROUND(s, t, 2);
    AES_DEC_ROUND(t, s, 3);
    AES_DEC_ROUND(s, t, 4);
    AES_DEC_ROUND(t, s, 5);
    AES_DEC_ROUND(s, t, 6);
    AES_DEC_ROUND(t, s, 7);
    AES_DEC_ROUND(s, t, 8);
    AES_DEC_ROUND(t, s, 9);

    if(Nr > 10) {
        AES_DEC_ROUND(s, t, 10);
        AES_DEC_ROUND(t, s, 11);
        if(Nr > 12) {
            AES_DEC_ROUND(s, t, 12);
            AES_DEC_ROUND(t, s, 13);
        }
    }

    rk += Nr << 2;
    // apply last round and map cipher state to byte array block
    s0 = m3(Td4[b3(t0)]) ^ m2(Td4[b2(t3)]) ^ m1(Td4[b1(t2)]) ^ m0(Td4[b0(t1)]) ^ rk[0];
    PUTU32(pt, s0);
    s1 = m3(Td4[b3(t1)]) ^ m2(Td4[b2(t0)]) ^ m1(Td4[b1(t3)]) ^ m0(Td4[b0(t2)]) ^ rk[1];
    PUTU32(pt +  4, s1);
    s2 = m3(Td4[b3(t2)]) ^ m2(Td4[b2(t1)]) ^ m1(Td4[b1(t0)]) ^ m0(Td4[b0(t3)]) ^ rk[2];
    PUTU32(pt +  8, s2);
    s3 = m3(Td4[b3(t3)]) ^ m2(Td4[b2(t2)]) ^ m1(Td4[b1(t1)]) ^ m0(Td4[b0(t0)]) ^ rk[3];
    PUTU32(pt + 12, s3);
}


// public API


int aes_ecb_decrypt (unsigned char *out, const unsigned char *in, aes_context_t *ctx) {

    aes_internal_decrypt(ctx->dec_rk, ctx->Nr, in, out);

    return AES_BLOCK_SIZE;
}


// not used
int aes_ecb_encrypt (unsigned char *out, const unsigned char *in, aes_context_t *ctx) {

    aes_internal_encrypt(ctx->enc_rk, ctx->Nr, in, out);

    return AES_BLOCK_SIZE;
}


#define fix_xor(target, source) *(uint32_t*)&(target)[0] = *(uint32_t*)&(target)[0] ^ *(uint32_t*)&(source)[0]; *(uint32_t*)&(target)[4] = *(uint32_t*)&(target)[4] ^ *(uint32_t*)&(source)[4]; \
    *(uint32_t*)&(target)[8] = *(uint32_t*)&(target)[8] ^ *(uint32_t*)&(source)[8]; *(uint32_t*)&(target)[12] = *(uint32_t*)&(target)[12] ^ *(uint32_t*)&(source)[12];


int aes_cbc_encrypt (unsigned char *out, const unsigned char *in, size_t in_len,
                     const unsigned char *iv, aes_context_t *ctx) {

    uint8_t tmp[AES_BLOCK_SIZE];
    size_t i;
    size_t n;

    memcpy(tmp, iv, AES_BLOCK_SIZE);

    n = in_len / AES_BLOCK_SIZE;
    for(i=0; i < n; i++) {
        fix_xor(tmp, &in[i * AES_BLOCK_SIZE]);
        aes_internal_encrypt(ctx->enc_rk, ctx->Nr, tmp, tmp);
        memcpy(&out[i * AES_BLOCK_SIZE], tmp, AES_BLOCK_SIZE);
    }

    return n * AES_BLOCK_SIZE;
}


int aes_cbc_decrypt (unsigned char *out, const unsigned char *in, size_t in_len,
                     const unsigned char *iv, aes_context_t *ctx) {

    uint8_t tmp[AES_BLOCK_SIZE];
    uint8_t old[AES_BLOCK_SIZE];
    size_t i;
    size_t n;

    memcpy(tmp, iv, AES_BLOCK_SIZE);

    n = in_len / AES_BLOCK_SIZE;
    for(i=0; i < n; i++) {
        memcpy(old, &in[i * AES_BLOCK_SIZE], AES_BLOCK_SIZE);
        aes_internal_decrypt(ctx->dec_rk, ctx->Nr, &in[i * AES_BLOCK_SIZE], &out[i * AES_BLOCK_SIZE]);
        fix_xor(&out[i * AES_BLOCK_SIZE], tmp);
        memcpy(tmp, old, AES_BLOCK_SIZE);
    }

    return n * AES_BLOCK_SIZE;
}


int aes_init (const unsigned char *key, size_t key_size, aes_context_t **ctx) {

    // allocate context...
    *ctx = (aes_context_t*) calloc(1, sizeof(aes_context_t));
    if(!(*ctx))
        return -1;
    // ...and fill her up:

    // initialize data structures

    // check key size and make key size (given in bytes) dependant settings
    switch(key_size) {
        case AES128_KEY_BYTES:    // 128 bit key size
            break;
        case AES192_KEY_BYTES:    // 192 bit key size
            break;
        case AES256_KEY_BYTES:    // 256 bit key size
            break;
        default:
            traceEvent(TRACE_ERROR, "aes_init invalid key size %u\n", key_size);
            return -1;
    }

    // key materiel handling
    (*ctx)->Nr = aes_internal_key_setup_enc((*ctx)->enc_rk /*[4*(Nr + 1)]*/, key, 8 * key_size);
    aes_internal_key_setup_dec((*ctx)->dec_rk /*[4*(Nr + 1)]*/, key, 8 * key_size);
    return 0;
}


#endif // openSSL 1.1, AES-NI, plain C ----------------------------------------------------------------------------


int aes_deinit (aes_context_t *ctx) {

    if(ctx) free(ctx);

    return 0;
}
