dvbcsa_bs.h

libdvbcsa is a implementation of the DVB Common Scrambling Algorithm

/*

    This file is part of libdvbcsa.

    libdvbcsa 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 2 of the License,
    or (at your option) any later version.

    libdvbcsa 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 libdvbcsa; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA

    Based on FFdecsa, Copyright (C) 2003-2004  fatih89r

    (c) 2006-2008 Alexandre Becoulet <[e-mail]>

*/

#ifndef DVBCSA_BS_H_
#define DVBCSA_BS_H_

#include "dvbcsa_pv.h"

#if defined(DVBCSA_USE_UINT64)
# include "dvbcsa_bs_uint64.h"

#elif defined(DVBCSA_USE_UINT32)
# include "dvbcsa_bs_uint32.h"

#elif defined(DVBCSA_USE_MMX)
# include "dvbcsa_bs_mmx.h"

#elif defined(DVBCSA_USE_SSE)
# include "dvbcsa_bs_sse.h"

#elif defined(DVBCSA_USE_ALTIVEC)
# include "dvbcsa_bs_altivec.h"

#else
# error No dvbcsa word size defined
#endif

struct dvbcsa_bs_key_s
{
  dvbcsa_bs_word_t	kkmulti[DVBCSA_KEYSBUFF_SIZE];

  // [byte][bit:0=LSB,7=MSB]
  dvbcsa_bs_word_t	ck_g[8][8];
  // [0 for A1][0 for LSB]
  dvbcsa_bs_word_t	iA_g[8][4];
  // [0 for B1][0 for LSB]
  dvbcsa_bs_word_t	iB_g[8][4];

  // iA[0] is for A1, iA[7] is for A8
  uint32_t		iA[8];
  // iB[0] is for B1, iB[7] is for B8
  uint32_t		iB[8];

  dvbcsa_keys_t		kk;
  dvbcsa_cw_t		ck;
}
#ifdef __GNUC__
  __attribute__ ((aligned(sizeof(dvbcsa_bs_word_t))))
#endif
;

void dvbcsa_bs_stream_cipher_batch(const struct dvbcsa_bs_key_s *key,
				   const struct dvbcsa_bs_batch_s *pcks,
				   unsigned int maxlen);

void dvbcsa_bs_block_decrypt_batch(const struct dvbcsa_bs_key_s *key,
				   const struct dvbcsa_bs_batch_s *pcks,
				   unsigned int maxlen);

void dvbcsa_bs_block_encrypt_batch(const struct dvbcsa_bs_key_s *key,
				   const struct dvbcsa_bs_batch_s *pcks,
				   unsigned int maxlen);

void dvbcsa_bs_block_transpose_in(dvbcsa_bs_word_t *out, const struct dvbcsa_bs_batch_s *pcks,
				  unsigned int offset);

void dvbcsa_bs_block_transpose_out(dvbcsa_bs_word_t *in, const struct dvbcsa_bs_batch_s *pcks,
				   unsigned int offset);

void dvbcsa_bs_stream_transpose_out(const struct dvbcsa_bs_batch_s *pcks,
				      unsigned int index, dvbcsa_bs_word_t *row);

void dvbcsa_bs_stream_transpose_in(const struct dvbcsa_bs_batch_s *pcks,
				     dvbcsa_bs_word_t *row);


#endif