/usr/include/dvbcsa/dvbcsa.h is in libdvbcsa-dev 1.1.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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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
Parallel bitslice implementation based on FFdecsa,
Copyright (C) 2003-2004 fatih89r
(c) 2006-2008 Alexandre Becoulet <alexandre.becoulet@free.fr>
*/
#ifndef LIBDVBCSA_H_
#define LIBDVBCSA_H_
/* csa control word */
typedef unsigned char dvbcsa_cw_t[8];
/***********************************************************************
Single packet CSA implemetation API
*/
/* single packet implementation key context */
typedef struct dvbcsa_key_s dvbcsa_key_t;
/** allocate a new csa key context */
struct dvbcsa_key_s * dvbcsa_key_alloc(void);
/** free a csa key context */
void dvbcsa_key_free(struct dvbcsa_key_s *key);
/** setup a csa key context to use the given control word */
void dvbcsa_key_set (const dvbcsa_cw_t cw, struct dvbcsa_key_s *key);
/** decrypt a packet payload */
void dvbcsa_decrypt (const struct dvbcsa_key_s *key,
unsigned char *data, unsigned int len);
/** encrypt a packet payload */
void dvbcsa_encrypt (const struct dvbcsa_key_s *key,
unsigned char *data, unsigned int len);
/***********************************************************************
Parallel bitslice CSA implemetation API
*/
/** packets batch structure, describe each data packet payload to process */
struct dvbcsa_bs_batch_s
{
unsigned char *data; /* pointer to payload */
unsigned int len; /* payload bytes lenght */
};
/** parallel bitslice implementation key context */
typedef struct dvbcsa_bs_key_s dvbcsa_bs_key_t;
/** allocate a new csa bitslice key context */
struct dvbcsa_bs_key_s * dvbcsa_bs_key_alloc(void);
/** free a csa bitslice key context */
void dvbcsa_bs_key_free(struct dvbcsa_bs_key_s *key);
/** setup a csa bitslice key context to use the given control word */
void dvbcsa_bs_key_set(const dvbcsa_cw_t cw, struct dvbcsa_bs_key_s *key);
/** get maximum number of packet per batch */
unsigned int dvbcsa_bs_batch_size(void);
/** decrypt a packet batch. batch is an array of struct
dvbcsa_bs_batch_s with an extra NULL data termination
entry. maxlen is the maximum data bytes lenght to process, must be
a multiple of 8, should be 184 for TS packets. */
void dvbcsa_bs_decrypt(const struct dvbcsa_bs_key_s *key,
const struct dvbcsa_bs_batch_s *pcks,
unsigned int maxlen);
/** encrypt a packet batch. batch is an array of struct
dvbcsa_bs_batch_s with an extra NULL data termination
entry. maxlen is the maximum data bytes lenght to process, must be
a multiple of 8, should be 184 for TS packets. */
void dvbcsa_bs_encrypt(const struct dvbcsa_bs_key_s *key,
const struct dvbcsa_bs_batch_s *pcks,
unsigned int maxlen);
#endif
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