Libav
rtmpdh.h
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1 /*
2  * RTMP Diffie-Hellmann utilities
3  * Copyright (c) 2012 Samuel Pitoiset
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #ifndef AVFORMAT_RTMPDH_H
23 #define AVFORMAT_RTMPDH_H
24 
25 #include <stdint.h>
26 
27 #include "config.h"
28 
29 #if CONFIG_GMP
30 #include <gmp.h>
31 
32 typedef mpz_ptr FFBigNum;
33 #elif CONFIG_GCRYPT
34 #include <gcrypt.h>
35 
36 typedef gcry_mpi_t FFBigNum;
37 
38 #elif CONFIG_OPENSSL
39 #include <openssl/bn.h>
40 #include <openssl/dh.h>
41 
42 typedef BIGNUM *FFBigNum;
43 #endif
44 
45 typedef struct FF_DH {
46  FFBigNum p;
47  FFBigNum g;
48  FFBigNum pub_key;
49  FFBigNum priv_key;
50  long length;
51 } FF_DH;
52 
53 
60 FF_DH *ff_dh_init(int key_len);
61 
67 void ff_dh_free(FF_DH *dh);
68 
76 
85 int ff_dh_write_public_key(FF_DH *dh, uint8_t *pub_key, int pub_key_len);
86 
99  int pub_key_len, uint8_t *secret_key,
100  int secret_key_len);
101 
102 #endif /* AVFORMAT_RTMPDH_H */
Definition: rtmpdh.h:45
FFBigNum priv_key
Definition: rtmpdh.h:49
uint8_t
FFBigNum p
Definition: rtmpdh.h:46
int ff_dh_compute_shared_secret_key(FF_DH *dh, const uint8_t *pub_key, int pub_key_len, uint8_t *secret_key, int secret_key_len)
Compute the shared secret key from the private FF_DH value and the other party&#39;s public value...
Definition: rtmpdh.c:326
void ff_dh_free(FF_DH *dh)
Free a Diffie-Hellmann context.
Definition: rtmpdh.c:205
FFBigNum g
Definition: rtmpdh.h:47
FF_DH * ff_dh_init(int key_len)
Initialize a Diffie-Hellmann context.
Definition: rtmpdh.c:257
long length
Definition: rtmpdh.h:50
int ff_dh_write_public_key(FF_DH *dh, uint8_t *pub_key, int pub_key_len)
Write the public key into the given buffer.
Definition: rtmpdh.c:310
int ff_dh_generate_public_key(FF_DH *dh)
Generate a public key.
Definition: rtmpdh.c:284
FFBigNum pub_key
Definition: rtmpdh.h:48