forked from KolibriOS/kolibrios
103 lines
2.8 KiB
C
103 lines
2.8 KiB
C
/*
|
|
* RTMP Diffie-Hellmann utilities
|
|
* Copyright (c) 2012 Samuel Pitoiset
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#ifndef AVFORMAT_RTMPDH_H
|
|
#define AVFORMAT_RTMPDH_H
|
|
|
|
#include "avformat.h"
|
|
#include "config.h"
|
|
|
|
#if CONFIG_NETTLE || CONFIG_GCRYPT
|
|
#if CONFIG_NETTLE
|
|
#include <gmp.h>
|
|
#include <nettle/bignum.h>
|
|
|
|
typedef mpz_ptr FFBigNum;
|
|
#elif CONFIG_GCRYPT
|
|
#include <gcrypt.h>
|
|
|
|
typedef gcry_mpi_t FFBigNum;
|
|
#endif
|
|
|
|
typedef struct FF_DH {
|
|
FFBigNum p;
|
|
FFBigNum g;
|
|
FFBigNum pub_key;
|
|
FFBigNum priv_key;
|
|
long length;
|
|
} FF_DH;
|
|
|
|
#elif CONFIG_OPENSSL
|
|
#include <openssl/bn.h>
|
|
#include <openssl/dh.h>
|
|
|
|
typedef BIGNUM *FFBigNum;
|
|
typedef DH FF_DH;
|
|
#endif
|
|
|
|
/**
|
|
* Initialize a Diffie-Hellmann context.
|
|
*
|
|
* @param key_len length of the key
|
|
* @return a new Diffie-Hellmann context on success, NULL otherwise
|
|
*/
|
|
FF_DH *ff_dh_init(int key_len);
|
|
|
|
/**
|
|
* Free a Diffie-Hellmann context.
|
|
*
|
|
* @param dh a Diffie-Hellmann context to free
|
|
*/
|
|
void ff_dh_free(FF_DH *dh);
|
|
|
|
/**
|
|
* Generate a public key.
|
|
*
|
|
* @param dh a Diffie-Hellmann context
|
|
* @return zero on success, negative value otherwise
|
|
*/
|
|
int ff_dh_generate_public_key(FF_DH *dh);
|
|
|
|
/**
|
|
* Write the public key into the given buffer.
|
|
*
|
|
* @param dh a Diffie-Hellmann context, containing the public key to write
|
|
* @param pub_key the buffer where the public key is written
|
|
* @param pub_key_len the length of the buffer
|
|
* @return zero on success, negative value otherwise
|
|
*/
|
|
int ff_dh_write_public_key(FF_DH *dh, uint8_t *pub_key, int pub_key_len);
|
|
|
|
/**
|
|
* Compute the shared secret key from the private FF_DH value and the
|
|
* other party's public value.
|
|
*
|
|
* @param dh a Diffie-Hellmann context, containing the private key
|
|
* @param pub_key the buffer containing the public key
|
|
* @param pub_key_len the length of the buffer
|
|
* @param secret_key the buffer where the secret key is written
|
|
* @return length of the shared secret key on success, negative value otherwise
|
|
*/
|
|
int ff_dh_compute_shared_secret_key(FF_DH *dh, const uint8_t *pub_key,
|
|
int pub_key_len, uint8_t *secret_key);
|
|
|
|
#endif /* AVFORMAT_RTMPDH_H */
|