1 /*

     2  * A 32-bit implementation of the XTEA algorithm

     3  *

     4  * This file is part of Libav.

     5  *

     6  * Libav is free software; you can redistribute it and/or

     7  * modify it under the terms of the GNU Lesser General Public

     8  * License as published by the Free Software Foundation; either

     9  * version 2.1 of the License, or (at your option) any later version.

    10  *

    11  * Libav is distributed in the hope that it will be useful,

    12  * but WITHOUT ANY WARRANTY; without even the implied warranty of

    13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    14  * Lesser General Public License for more details.

    15  *

    16  * You should have received a copy of the GNU Lesser General Public

    17  * License along with Libav; if not, write to the Free Software

    18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

    19  */

    20 

    21 #ifndef AVUTIL_XTEA_H

    22 #define AVUTIL_XTEA_H

    23 

    24 #include <stdint.h>

    25 

    26 /**

    27  * @defgroup lavu_xtea XTEA

    28  * @ingroup lavu_crypto

    29  * @{

    30  */

    31 

    32 typedef struct AVXTEA {

    33     uint32_t key[16];

    34 } AVXTEA;

    35 

    36 /**

    37  * Initialize an AVXTEA context.

    38  *

    39  * @param ctx an AVXTEA context

    40  * @param key a key of 16 bytes used for encryption/decryption

    41  */

    42 void av_xtea_init(struct AVXTEA *ctx, const uint8_t key[16]);

    43 

    44 /**

    45  * Encrypt or decrypt a buffer using a previously initialized context.

    46  *

    47  * @param ctx an AVXTEA context

    48  * @param dst destination array, can be equal to src

    49  * @param src source array, can be equal to dst

    50  * @param count number of 8 byte blocks

    51  * @param iv initialization vector for CBC mode, if NULL then ECB will be used

    52  * @param decrypt 0 for encryption, 1 for decryption

    53  */

    54 void av_xtea_crypt(struct AVXTEA *ctx, uint8_t *dst, const uint8_t *src,

    55                    int count, uint8_t *iv, int decrypt);

    56 

    57 /**

    58  * @}

    59  */

    60 

    61 #endif /* AVUTIL_XTEA_H */