Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93) * Add Chacha20-Poly1305 authenticated encryption * Add general AEAD approach. * Add [email protected] algo using LibTomCrypt chacha and poly1305 routines. Chacha20-Poly1305 is generally faster than AES256 on CPU w/o dedicated AES instructions, having the same key size. Compiling in will add ~5,5kB to binary size on x86-64. function old new delta chacha_crypt - 1397 +1397 _poly1305_block - 608 +608 poly1305_done - 595 +595 dropbear_chachapoly_crypt - 457 +457 .rodata 26976 27392 +416 poly1305_process - 290 +290 poly1305_init - 221 +221 chacha_setup - 218 +218 encrypt_packet 1068 1270 +202 dropbear_chachapoly_getlength - 147 +147 decrypt_packet 756 897 +141 chacha_ivctr64 - 137 +137 read_packet 543 637 +94 dropbear_chachapoly_start - 94 +94 read_kex_algos 792 880 +88 chacha_keystream - 69 +69 dropbear_mode_chachapoly - 48 +48 sshciphers 280 320 +40 dropbear_mode_none 24 48 +24 dropbear_mode_ctr 24 48 +24 dropbear_mode_cbc 24 48 +24 dropbear_chachapoly_mac - 24 +24 dropbear_chachapoly - 24 +24 gen_new_keys 848 854 +6 ------------------------------------------------------------------------------ (add/remove: 14/0 grow/shrink: 10/0 up/down: 5388/0) Total: 5388 bytes * Add AES128-GCM and AES256-GCM authenticated encryption * Add general AES-GCM mode. * Add [email protected] and [email protected] algo using LibTomCrypt gcm routines. AES-GCM is combination of AES CTR mode and GHASH, slower than AES-CTR on CPU w/o dedicated AES/GHASH instructions therefore disabled by default. Compiling in will add ~6kB to binary size on x86-64. function old new delta gcm_process - 1060 +1060 .rodata 26976 27808 +832 gcm_gf_mult - 820 +820 gcm_add_aad - 660 +660 gcm_shift_table - 512 +512 gcm_done - 471 +471 gcm_add_iv - 384 +384 gcm_init - 347 +347 dropbear_gcm_crypt - 309 +309 encrypt_packet 1068 1270 +202 decrypt_packet 756 897 +141 gcm_reset - 118 +118 read_packet 543 637 +94 read_kex_algos 792 880 +88 sshciphers 280 360 +80 gcm_mult_h - 80 +80 dropbear_gcm_start - 62 +62 dropbear_mode_gcm - 48 +48 dropbear_mode_none 24 48 +24 dropbear_mode_ctr 24 48 +24 dropbear_mode_cbc 24 48 +24 dropbear_ghash - 24 +24 dropbear_gcm_getlength - 24 +24 gen_new_keys 848 854 +6 ------------------------------------------------------------------------------ (add/remove: 14/0 grow/shrink: 10/0 up/down: 6434/0) Total: 6434 bytes

#ifndef DROPBEAR_NETIO_H
#define DROPBEAR_NETIO_H

#include "includes.h"
#include "buffer.h"
#include "queue.h"

enum dropbear_prio {
	DROPBEAR_PRIO_DEFAULT = 10,
	DROPBEAR_PRIO_LOWDELAY = 11,
	DROPBEAR_PRIO_BULK = 12,
};

void set_sock_nodelay(int sock);
void set_sock_priority(int sock, enum dropbear_prio prio);

int get_sock_port(int sock);
void get_socket_address(int fd, char **local_host, char **local_port,
		char **remote_host, char **remote_port, int host_lookup);
void getaddrstring(struct sockaddr_storage* addr, 
		char **ret_host, char **ret_port, int host_lookup);
int dropbear_listen(const char* address, const char* port,
		int *socks, unsigned int sockcount, char **errstring, int *maxfd);

struct dropbear_progress_connection;

/* result is DROPBEAR_SUCCESS or DROPBEAR_FAILURE.
errstring is only set on DROPBEAR_FAILURE, returns failure message for the last attempted socket */
typedef void(*connect_callback)(int result, int sock, void* data, const char* errstring);

/* Always returns a progress connection, if it fails it will call the callback at a later point */
struct dropbear_progress_connection * connect_remote (const char* remotehost, const char* remoteport,
	connect_callback cb, void *cb_data, const char* bind_address, const char* bind_port);

/* Sets up for select() */
void set_connect_fds(fd_set *writefd);
/* Handles ready sockets after select() */
void handle_connect_fds(const fd_set *writefd);
/* Cleanup */
void remove_connect_pending(void);

/* Doesn't actually stop the connect, but adds a dummy callback instead */
void cancel_connect(struct dropbear_progress_connection *c);

void connect_set_writequeue(struct dropbear_progress_connection *c, struct Queue *writequeue);

/* TODO: writev #ifdef guard */
/* Fills out iov which contains iov_count slots, returning the number filled in iov_count */
void packet_queue_to_iovec(const struct Queue *queue, struct iovec *iov, unsigned int *iov_count);
void packet_queue_consume(struct Queue *queue, ssize_t written);

#if DROPBEAR_SERVER_TCP_FAST_OPEN
/* Try for any Linux builds, will fall back if the kernel doesn't support it */
void set_listen_fast_open(int sock);
/* Define values which may be supported by the kernel even if the libc is too old */
#ifndef TCP_FASTOPEN
#define TCP_FASTOPEN 23
#endif
#ifndef MSG_FASTOPEN
#define MSG_FASTOPEN 0x20000000
#endif
#endif

#endif