/**
 * (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/>
 *
 */


// cipher SPECK -- 128 bit block size -- 256 bit key size
// taken from (and modified: removed pure crypto-stream generation and seperated key expansion)
// https://github.com/nsacyber/simon-speck-supercop/blob/master/crypto_stream/speck128256ctr/


#ifndef SPECK_H
#define SPECK_H

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

#define u32 uint32_t
#define u64 uint64_t

#define N2N_SPECK_IVEC_SIZE     16
#define SPECK_KEY_BYTES       (256/8)


#if defined (__AVX2__)

#include <immintrin.h>
#define SPECK_ALIGNED_CTX	32
#define u256 __m256i
typedef struct {
  u256 rk[34];
  u64 key[34];
} speck_context_t;

#elif defined (__SSE4_2__)

#include <immintrin.h>
#define SPECK_ALIGNED_CTX	16
#define SPECK_CTX_BYVAL		 1
#define u128 __m128i
typedef struct {
  u128 rk[34];
  u64 key[34];
} speck_context_t;

#elif defined (__ARM_NEON)

#include <arm_neon.h>
#define u128 uint64x2_t
typedef struct {
  u128 rk[34];
  u64 key[34];
} speck_context_t;

#else

typedef struct {
  u64 key[34];
} speck_context_t;

#endif

// -----

int speck_ctr (unsigned char *out, const unsigned char *in, unsigned long long inlen,
               const unsigned char *n,
	       speck_context_t *ctx);

int speck_init (const unsigned char *k, speck_context_t **ctx);

int speck_deinit (speck_context_t *ctx);

// -----

int speck_he (unsigned char *out, const unsigned char *in, unsigned long long inlen,
              const unsigned char *n, speck_context_t *ctx);

int speck_expand_key_he (const unsigned char *k, speck_context_t *ctx);

// -----

int speck_he_iv_encrypt (unsigned char *inout, speck_context_t *ctx);

int speck_he_iv_decrypt (unsigned char *inout, speck_context_t *ctx);

int speck_expand_key_he_iv (const unsigned char *k, speck_context_t *ctx);


#endif // SPECK_H