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/*
* RTMPE encryption utilities
* Copyright (c) 2012 Samuel Pitoiset
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVFORMAT_RTMPCRYPT_H
#define AVFORMAT_RTMPCRYPT_H
#include <stdint.h>
#include "url.h"
/**
* Initialize the Diffie-Hellmann context and generate the public key.
*
* @param h an URLContext
* @param buf handshake data (1536 bytes)
* @return zero on success, negative value otherwise
*/
int ff_rtmpe_gen_pub_key(URLContext *h, uint8_t *buf);
/**
* Compute the shared secret key and initialize the RC4 encryption.
*
* @param h an URLContext
* @param serverdata server data (1536 bytes)
* @param clientdata client data (1536 bytes)
* @param type the position of the server digest
* @return zero on success, negative value otherwise
*/
int ff_rtmpe_compute_secret_key(URLContext *h, const uint8_t *serverdata,
const uint8_t *clientdata, int type);
/**
* Encrypt the signature.
*
* @param h an URLContext
* @param signature the signature to encrypt
* @param digest the digest used for finding the encryption key
* @param type type of encryption (8 for XTEA, 9 for Blowfish)
*/
void ff_rtmpe_encrypt_sig(URLContext *h, uint8_t *signature,
const uint8_t *digest, int type);
/**
* Update the keystream and set RC4 keys for encryption.
*
* @param h an URLContext
* @return zero on success, negative value otherwise
*/
int ff_rtmpe_update_keystream(URLContext *h);
#endif /* AVFORMAT_RTMPCRYPT_H */
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