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/**
* (C) 2007-22 - ntop.org and contributors
*
* 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 "n2n.h" // HAVE_OPENSSL_1_1, traceEvent ...
#ifndef AES_H
#define AES_H
#include <stdint.h>
#include <stdlib.h>
#include "portable_endian.h"
#define AES_BLOCK_SIZE 16
#define AES_IV_SIZE (AES_BLOCK_SIZE)
#define AES256_KEY_BYTES (256/8)
#define AES192_KEY_BYTES (192/8)
#define AES128_KEY_BYTES (128/8)
#if defined (HAVE_OPENSSL_1_1) // openSSL 1.1 ---------------------------------------------------------------------
#include <openssl/aes.h>
#include <openssl/evp.h>
#include <openssl/err.h>
typedef struct aes_context_t {
EVP_CIPHER_CTX *enc_ctx; /* openssl's reusable evp_* en/de-cryption context */
EVP_CIPHER_CTX *dec_ctx; /* openssl's reusable evp_* en/de-cryption context */
const EVP_CIPHER *cipher; /* cipher to use: e.g. EVP_aes_128_cbc */
uint8_t key[AES256_KEY_BYTES]; /* the pure key data for payload encryption & decryption */
AES_KEY ecb_dec_key; /* one step ecb decryption key */
} aes_context_t;
#elif defined (__AES__) && defined (__SSE2__) // Intel's AES-NI ---------------------------------------------------
#include <immintrin.h>
typedef struct aes_context_t {
__m128i rk_enc[15];
__m128i rk_dec[15];
int Nr;
} aes_context_t;
#else // plain C --------------------------------------------------------------------------------------------------
typedef struct aes_context_t {
uint32_t enc_rk[60]; // round keys for encryption
uint32_t dec_rk[60]; // round keys for decryption
int Nr; // number of rounds
} aes_context_t;
#endif // ---------------------------------------------------------------------------------------------------------
int aes_cbc_encrypt (unsigned char *out, const unsigned char *in, size_t in_len,
const unsigned char *iv, aes_context_t *ctx);
int aes_cbc_decrypt (unsigned char *out, const unsigned char *in, size_t in_len,
const unsigned char *iv, aes_context_t *ctx);
int aes_ecb_decrypt (unsigned char *out, const unsigned char *in, aes_context_t *ctx);
int aes_init (const unsigned char *key, size_t key_size, aes_context_t **ctx);
int aes_deinit (aes_context_t *ctx);
#endif // AES_H
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