n2n/include/tf.h

/**
 * (C) 2007-20 - 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/>
 *
 */


// taken (and modified) from github/fudanchii/twofish as of August 2020
// which itself is a modified copy of Andrew T. Csillag's implementation
// published on github/drewcsillag/twofish


/*
The MIT License (MIT)

Copyright (c) 2015 Andrew T. Csillag

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/


#ifndef TF_H
#define TF_H

#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "portable_endian.h"


#define TF_BLOCK_SIZE           16
#define TF_IV_SIZE             (TF_BLOCK_SIZE)


typedef struct tf_context_t {
    int N;
    uint32_t K[40];
    uint32_t QF[4][256];
} tf_context_t;


int tf_ecb_decrypt (unsigned char *out, const unsigned char *in, tf_context_t *ctx);

int tf_ecb_encrypt (unsigned char *out, const unsigned char *in, tf_context_t *ctx);

int tf_cbc_encrypt (unsigned char *out, const unsigned char *in, size_t in_len,
                    const unsigned char *iv, tf_context_t *ctx);

int tf_cbc_decrypt (unsigned char *out, const unsigned char *in, size_t in_len,
                    const unsigned char *iv, tf_context_t *ctx);

int tf_init (const unsigned char *key, size_t key_size, tf_context_t **ctx);

int tf_deinit (tf_context_t *ctx);


#endif    // TF_H