2 * A 32-bit implementation of the XTEA algorithm
4 * This file is part of Libav.
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.
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.
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
29 * @brief Public header for libavutil XTEA algorithm
30 * @defgroup lavu_xtea XTEA
31 * @ingroup lavu_crypto
35 #if FF_API_CRYPTO_CONTEXT
36 typedef struct AVXTEA {
40 typedef struct AVXTEA AVXTEA;
44 * Allocate an AVXTEA context.
46 AVXTEA *av_xtea_alloc(void);
49 * Initialize an AVXTEA context.
51 * @param ctx an AVXTEA context
52 * @param key a key of 16 bytes used for encryption/decryption,
53 * interpreted as big endian 32 bit numbers
55 void av_xtea_init(struct AVXTEA *ctx, const uint8_t key[16]);
58 * Initialize an AVXTEA context.
60 * @param ctx an AVXTEA context
61 * @param key a key of 16 bytes used for encryption/decryption,
62 * interpreted as little endian 32 bit numbers
64 void av_xtea_le_init(struct AVXTEA *ctx, const uint8_t key[16]);
67 * Encrypt or decrypt a buffer using a previously initialized context,
68 * in big endian format.
70 * @param ctx an AVXTEA context
71 * @param dst destination array, can be equal to src
72 * @param src source array, can be equal to dst
73 * @param count number of 8 byte blocks
74 * @param iv initialization vector for CBC mode, if NULL then ECB will be used
75 * @param decrypt 0 for encryption, 1 for decryption
77 void av_xtea_crypt(struct AVXTEA *ctx, uint8_t *dst, const uint8_t *src,
78 int count, uint8_t *iv, int decrypt);
81 * Encrypt or decrypt a buffer using a previously initialized context,
82 * in little endian format.
84 * @param ctx an AVXTEA context
85 * @param dst destination array, can be equal to src
86 * @param src source array, can be equal to dst
87 * @param count number of 8 byte blocks
88 * @param iv initialization vector for CBC mode, if NULL then ECB will be used
89 * @param decrypt 0 for encryption, 1 for decryption
91 void av_xtea_le_crypt(struct AVXTEA *ctx, uint8_t *dst, const uint8_t *src,
92 int count, uint8_t *iv, int decrypt);
98 #endif /* AVUTIL_XTEA_H */