FFmpeg
des.h
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1 /*
2  * DES encryption/decryption
3  * Copyright (c) 2007 Reimar Doeffinger
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_DES_H
23 #define AVUTIL_DES_H
24 
25 #include <stdint.h>
26 
27 /**
28  * @defgroup lavu_des DES
29  * @ingroup lavu_crypto
30  * @{
31  */
32 
33 typedef struct AVDES {
34  uint64_t round_keys[3][16];
36 } AVDES;
37 
38 /**
39  * Allocate an AVDES context.
40  */
41 AVDES *av_des_alloc(void);
42 
43 /**
44  * @brief Initializes an AVDES context.
45  *
46  * @param d pointer to a AVDES structure to initialize
47  * @param key pointer to the key to use
48  * @param key_bits must be 64 or 192
49  * @param decrypt 0 for encryption/CBC-MAC, 1 for decryption
50  * @return zero on success, negative value otherwise
51  */
52 int av_des_init(struct AVDES *d, const uint8_t *key, int key_bits, int decrypt);
53 
54 /**
55  * @brief Encrypts / decrypts using the DES algorithm.
56  *
57  * @param d pointer to the AVDES structure
58  * @param dst destination array, can be equal to src, must be 8-byte aligned
59  * @param src source array, can be equal to dst, must be 8-byte aligned, may be NULL
60  * @param count number of 8 byte blocks
61  * @param iv initialization vector for CBC mode, if NULL then ECB will be used,
62  * must be 8-byte aligned
63  * @param decrypt 0 for encryption, 1 for decryption
64  */
65 void av_des_crypt(struct AVDES *d, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt);
66 
67 /**
68  * @brief Calculates CBC-MAC using the DES algorithm.
69  *
70  * @param d pointer to the AVDES structure
71  * @param dst destination array, can be equal to src, must be 8-byte aligned
72  * @param src source array, can be equal to dst, must be 8-byte aligned, may be NULL
73  * @param count number of 8 byte blocks
74  */
75 void av_des_mac(struct AVDES *d, uint8_t *dst, const uint8_t *src, int count);
76 
77 /**
78  * @}
79  */
80 
81 #endif /* AVUTIL_DES_H */
av_des_crypt
void av_des_crypt(struct AVDES *d, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt)
Encrypts / decrypts using the DES algorithm.
Definition: des.c:324
AVDES::triple_des
int triple_des
Definition: des.h:35
av_des_mac
void av_des_mac(struct AVDES *d, uint8_t *dst, const uint8_t *src, int count)
Calculates CBC-MAC using the DES algorithm.
Definition: des.c:330
key
const char * key
Definition: hwcontext_opencl.c:174
AVDES::round_keys
uint64_t round_keys[3][16]
Definition: des.h:34
av_des_init
int av_des_init(struct AVDES *d, const uint8_t *key, int key_bits, int decrypt)
Initializes an AVDES context.
av_des_alloc
AVDES * av_des_alloc(void)
Allocate an AVDES context.
Definition: des.c:275
AVDES
Definition: des.h:33
src
INIT_CLIP pixel * src
Definition: h264pred_template.c:418
d
d
Definition: ffmpeg_filter.c:424