1 /*
2 * RTMP Diffie-Hellmann utilities
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 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 #elif CONFIG_MBEDTLS
44 #include <mbedtls/bignum.h>
45
46 typedef mbedtls_mpi *FFBigNum;
47
48 #endif
49
57
58
59 /**
60 * Initialize a Diffie-Hellmann context.
61 *
62 * @param key_len length of the key
63 * @return a new Diffie-Hellmann context on success, NULL otherwise
64 */
66
67 /**
68 * Free a Diffie-Hellmann context.
69 *
70 * @param dh a Diffie-Hellmann context to free
71 */
73
74 /**
75 * Generate a public key.
76 *
77 * @param dh a Diffie-Hellmann context
78 * @return zero on success, negative value otherwise
79 */
81
82 /**
83 * Write the public key into the given buffer.
84 *
85 * @param dh a Diffie-Hellmann context, containing the public key to write
86 * @param pub_key the buffer where the public key is written
87 * @param pub_key_len the length of the buffer
88 * @return zero on success, negative value otherwise
89 */
91
92 /**
93 * Compute the shared secret key from the private FF_DH value and the
94 * other party's public value.
95 *
96 * @param dh a Diffie-Hellmann context, containing the private key
97 * @param pub_key the buffer containing the public key
98 * @param pub_key_len the length of the public key buffer
99 * @param secret_key the buffer where the secret key is written
100 * @param secret_key_len the length of the secret key buffer
101 * @return length of the shared secret key on success, negative value otherwise
102 */
104 int pub_key_len, uint8_t *secret_key,
105 int secret_key_len);
106
107 #endif /* AVFORMAT_RTMPDH_H */