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/*
* ProFTPD - mod_proxy SSH cipher API
* Copyright (c) 2021-2022 TJ Saunders
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA.
*
* As a special exemption, TJ Saunders and other respective copyright holders
* give permission to link this program with OpenSSL, and distribute the
* resulting executable, without including the source code for OpenSSL in the
* source distribution.
*/
#ifndef MOD_PROXY_SSH_CIPHER_H
#define MOD_PROXY_SSH_CIPHER_H
#include "mod_proxy.h"
#if defined(PR_USE_OPENSSL)
int proxy_ssh_cipher_init(void);
int proxy_ssh_cipher_free(void);
/* Returns the cipher block size, or 8, whichever is larger. This value is
* used when reading in the first bytes of a packet in order to determine
* the packet length. See RFC4253, Section 6, "Binary Packet Protocol".
*/
size_t proxy_ssh_cipher_get_read_block_size(void);
size_t proxy_ssh_cipher_get_write_block_size(void);
void proxy_ssh_cipher_set_read_block_size(size_t);
void proxy_ssh_cipher_set_write_block_size(size_t);
/* Returns the cipher authenticated data size, or zero. */
size_t proxy_ssh_cipher_get_read_auth_size(void);
size_t proxy_ssh_cipher_get_read_auth_size2(void);
size_t proxy_ssh_cipher_get_write_auth_size(void);
size_t proxy_ssh_cipher_get_write_auth_size2(void);
const char *proxy_ssh_cipher_get_read_algo(void);
int proxy_ssh_cipher_set_read_algo(pool *p, const char *algo);
int proxy_ssh_cipher_set_read_key(pool *p, const EVP_MD *md,
const unsigned char *k, uint32_t klen, const char *h, uint32_t hlen,
int role);
int proxy_ssh_cipher_read_data(struct proxy_ssh_packet *pkt,
unsigned char *data, uint32_t data_len, unsigned char **buf,
uint32_t *buflen);
const char *proxy_ssh_cipher_get_write_algo(void);
int proxy_ssh_cipher_set_write_algo(pool *p, const char *algo);
int proxy_ssh_cipher_set_write_key(pool *p, const EVP_MD *md,
const unsigned char *k, uint32_t klen, const char *h, uint32_t hlen,
int role);
int proxy_ssh_cipher_write_data(struct proxy_ssh_packet *pkt,
unsigned char *buf, size_t *bufsz);
#endif /* PR_USE_OPENSSL */
#endif /* MOD_PROXY_SSH_CIPHER_H */
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