FFmpeg
xtea.h
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1 /*
2  * A 32-bit implementation of the XTEA algorithm
3  * Copyright (c) 2012 Samuel Pitoiset
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #ifndef AVUTIL_XTEA_H
23 #define AVUTIL_XTEA_H
24 
25 #include <stdint.h>
26 
27 /**
28  * @file
29  * @brief Public header for libavutil XTEA algorithm
30  * @defgroup lavu_xtea XTEA
31  * @ingroup lavu_crypto
32  * @{
33  */
34 
35 typedef struct AVXTEA {
36  uint32_t key[16];
37 } AVXTEA;
38 
39 /**
40  * Allocate an AVXTEA context.
41  */
42 AVXTEA *av_xtea_alloc(void);
43 
44 /**
45  * Initialize an AVXTEA context.
46  *
47  * @param ctx an AVXTEA context
48  * @param key a key of 16 bytes used for encryption/decryption,
49  * interpreted as big endian 32 bit numbers
50  */
51 void av_xtea_init(struct AVXTEA *ctx, const uint8_t key[16]);
52 
53 /**
54  * Initialize an AVXTEA context.
55  *
56  * @param ctx an AVXTEA context
57  * @param key a key of 16 bytes used for encryption/decryption,
58  * interpreted as little endian 32 bit numbers
59  */
60 void av_xtea_le_init(struct AVXTEA *ctx, const uint8_t key[16]);
61 
62 /**
63  * Encrypt or decrypt a buffer using a previously initialized context,
64  * in big endian format.
65  *
66  * @param ctx an AVXTEA context
67  * @param dst destination array, can be equal to src
68  * @param src source array, can be equal to dst
69  * @param count number of 8 byte blocks
70  * @param iv initialization vector for CBC mode, if NULL then ECB will be used
71  * @param decrypt 0 for encryption, 1 for decryption
72  */
73 void av_xtea_crypt(struct AVXTEA *ctx, uint8_t *dst, const uint8_t *src,
74  int count, uint8_t *iv, int decrypt);
75 
76 /**
77  * Encrypt or decrypt a buffer using a previously initialized context,
78  * in little endian format.
79  *
80  * @param ctx an AVXTEA context
81  * @param dst destination array, can be equal to src
82  * @param src source array, can be equal to dst
83  * @param count number of 8 byte blocks
84  * @param iv initialization vector for CBC mode, if NULL then ECB will be used
85  * @param decrypt 0 for encryption, 1 for decryption
86  */
87 void av_xtea_le_crypt(struct AVXTEA *ctx, uint8_t *dst, const uint8_t *src,
88  int count, uint8_t *iv, int decrypt);
89 
90 /**
91  * @}
92  */
93 
94 #endif /* AVUTIL_XTEA_H */
av_xtea_crypt
void av_xtea_crypt(struct AVXTEA *ctx, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt)
Encrypt or decrypt a buffer using a previously initialized context, in big endian format.
Definition: xtea.c:243
av_xtea_init
void av_xtea_init(struct AVXTEA *ctx, const uint8_t key[16])
Initialize an AVXTEA context.
Definition: xtea.c:42
ctx
AVFormatContext * ctx
Definition: movenc.c:48
key
const char * key
Definition: hwcontext_opencl.c:174
AVXTEA::key
uint32_t key[16]
Definition: xtea.h:36
av_xtea_le_init
void av_xtea_le_init(struct AVXTEA *ctx, const uint8_t key[16])
Initialize an AVXTEA context.
Definition: xtea.c:50
AVXTEA
Definition: xtea.h:35
av_xtea_alloc
AVXTEA * av_xtea_alloc(void)
Allocate an AVXTEA context.
Definition: xtea.c:37
av_xtea_le_crypt
void av_xtea_le_crypt(struct AVXTEA *ctx, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt)
Encrypt or decrypt a buffer using a previously initialized context, in little endian format.
Definition: xtea.c:249
src
INIT_CLIP pixel * src
Definition: h264pred_template.c:418