repositories / deb_ffmpeg.git / blame
| Commit | Line | Data |
|---|---|---|
| 2ba45a60 DM |
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 "avformat.h" | |
| 26 | #include "config.h" | |
| 27 | ||
| 28 | #if CONFIG_NETTLE || CONFIG_GCRYPT | |
| 29 | #if CONFIG_NETTLE | |
| 30 | #include <gmp.h> | |
| 31 | #include <nettle/bignum.h> | |
| 32 | ||
| 33 | typedef mpz_ptr FFBigNum; | |
| 34 | #elif CONFIG_GCRYPT | |
| 35 | #include <gcrypt.h> | |
| 36 | ||
| 37 | typedef gcry_mpi_t FFBigNum; | |
| 38 | #endif | |
| 39 | ||
| 40 | typedef struct FF_DH { | |
| 41 | FFBigNum p; | |
| 42 | FFBigNum g; | |
| 43 | FFBigNum pub_key; | |
| 44 | FFBigNum priv_key; | |
| 45 | long length; | |
| 46 | } FF_DH; | |
| 47 | ||
| 48 | #elif CONFIG_OPENSSL | |
| 49 | #include <openssl/bn.h> | |
| 50 | #include <openssl/dh.h> | |
| 51 | ||
| 52 | typedef BIGNUM *FFBigNum; | |
| 53 | typedef DH FF_DH; | |
| 54 | #endif | |
| 55 | ||
| 56 | /** | |
| 57 | * Initialize a Diffie-Hellmann context. | |
| 58 | * | |
| 59 | * @param key_len length of the key | |
| 60 | * @return a new Diffie-Hellmann context on success, NULL otherwise | |
| 61 | */ | |
| 62 | FF_DH *ff_dh_init(int key_len); | |
| 63 | ||
| 64 | /** | |
| 65 | * Free a Diffie-Hellmann context. | |
| 66 | * | |
| 67 | * @param dh a Diffie-Hellmann context to free | |
| 68 | */ | |
| 69 | void ff_dh_free(FF_DH *dh); | |
| 70 | ||
| 71 | /** | |
| 72 | * Generate a public key. | |
| 73 | * | |
| 74 | * @param dh a Diffie-Hellmann context | |
| 75 | * @return zero on success, negative value otherwise | |
| 76 | */ | |
| 77 | int ff_dh_generate_public_key(FF_DH *dh); | |
| 78 | ||
| 79 | /** | |
| 80 | * Write the public key into the given buffer. | |
| 81 | * | |
| 82 | * @param dh a Diffie-Hellmann context, containing the public key to write | |
| 83 | * @param pub_key the buffer where the public key is written | |
| 84 | * @param pub_key_len the length of the buffer | |
| 85 | * @return zero on success, negative value otherwise | |
| 86 | */ | |
| 87 | int ff_dh_write_public_key(FF_DH *dh, uint8_t *pub_key, int pub_key_len); | |
| 88 | ||
| 89 | /** | |
| 90 | * Compute the shared secret key from the private FF_DH value and the | |
| 91 | * other party's public value. | |
| 92 | * | |
| 93 | * @param dh a Diffie-Hellmann context, containing the private key | |
| 94 | * @param pub_key the buffer containing the public key | |
| 95 | * @param pub_key_len the length of the buffer | |
| 96 | * @param secret_key the buffer where the secret key is written | |
| 97 | * @return length of the shared secret key on success, negative value otherwise | |
| 98 | */ | |
| 99 | int ff_dh_compute_shared_secret_key(FF_DH *dh, const uint8_t *pub_key, | |
| 100 | int pub_key_len, uint8_t *secret_key); | |
| 101 | ||
| 102 | #endif /* AVFORMAT_RTMPDH_H */ |