FFmpeg
libavformat
rtmpdh.h
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/*
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* RTMP Diffie-Hellmann utilities
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* Copyright (c) 2012 Samuel Pitoiset
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVFORMAT_RTMPDH_H
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#define AVFORMAT_RTMPDH_H
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#include <stdint.h>
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#include "config.h"
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#if CONFIG_GMP
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#include <gmp.h>
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typedef
mpz_ptr FFBigNum;
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#elif CONFIG_GCRYPT
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#include <gcrypt.h>
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typedef
gcry_mpi_t FFBigNum;
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#elif CONFIG_OPENSSL
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#include <openssl/bn.h>
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#include <openssl/dh.h>
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typedef
BIGNUM *FFBigNum;
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#elif CONFIG_MBEDTLS
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#include <mbedtls/bignum.h>
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typedef
mbedtls_mpi *FFBigNum;
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#endif
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typedef
struct
FF_DH
{
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FFBigNum
p
;
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FFBigNum
g
;
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FFBigNum
pub_key
;
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FFBigNum
priv_key
;
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long
length
;
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}
FF_DH
;
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/**
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* Initialize a Diffie-Hellmann context.
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*
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* @param key_len length of the key
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* @return a new Diffie-Hellmann context on success, NULL otherwise
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*/
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FF_DH
*
ff_dh_init
(
int
key_len);
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/**
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* Free a Diffie-Hellmann context.
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*
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* @param dh a Diffie-Hellmann context to free
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*/
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void
ff_dh_free
(
FF_DH
*dh);
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/**
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* Generate a public key.
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*
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* @param dh a Diffie-Hellmann context
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* @return zero on success, negative value otherwise
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*/
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int
ff_dh_generate_public_key
(
FF_DH
*dh);
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/**
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* Write the public key into the given buffer.
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*
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* @param dh a Diffie-Hellmann context, containing the public key to write
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* @param pub_key the buffer where the public key is written
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* @param pub_key_len the length of the buffer
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* @return zero on success, negative value otherwise
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*/
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int
ff_dh_write_public_key
(
FF_DH
*dh, uint8_t *pub_key,
int
pub_key_len);
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/**
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* Compute the shared secret key from the private FF_DH value and the
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* other party's public value.
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*
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* @param dh a Diffie-Hellmann context, containing the private key
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* @param pub_key the buffer containing the public key
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* @param pub_key_len the length of the public key buffer
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* @param secret_key the buffer where the secret key is written
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* @param secret_key_len the length of the secret key buffer
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* @return length of the shared secret key on success, negative value otherwise
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*/
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int
ff_dh_compute_shared_secret_key
(
FF_DH
*dh,
const
uint8_t *pub_key,
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int
pub_key_len, uint8_t *secret_key,
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int
secret_key_len);
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#endif
/* AVFORMAT_RTMPDH_H */
FF_DH::length
long length
Definition:
rtmpdh.h:55
ff_dh_free
void ff_dh_free(FF_DH *dh)
Free a Diffie-Hellmann context.
Definition:
rtmpdh.c:272
FF_DH::pub_key
FFBigNum pub_key
Definition:
rtmpdh.h:53
ff_dh_generate_public_key
int ff_dh_generate_public_key(FF_DH *dh)
Generate a public key.
Definition:
rtmpdh.c:351
ff_dh_compute_shared_secret_key
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's public value.
Definition:
rtmpdh.c:393
FF_DH::priv_key
FFBigNum priv_key
Definition:
rtmpdh.h:54
ff_dh_write_public_key
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:377
FF_DH::g
FFBigNum g
Definition:
rtmpdh.h:52
FF_DH::p
FFBigNum p
Definition:
rtmpdh.h:51
FF_DH
Definition:
rtmpdh.h:50
ff_dh_init
FF_DH * ff_dh_init(int key_len)
Initialize a Diffie-Hellmann context.
Definition:
rtmpdh.c:324
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