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108 lines
2.9 KiB
C
108 lines
2.9 KiB
C
/*
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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 */
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