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

/*
 * Dropbear - a SSH2 server
 * 
 * Copyright (c) 2002,2003 Matt Johnston
 * All rights reserved.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE. */

#ifndef DROPBEAR_SIGNKEY_H_
#define DROPBEAR_SIGNKEY_H_

#include "buffer.h"
#include "dss.h"
#include "rsa.h"
#include "ed25519.h"

enum signkey_type {
#if DROPBEAR_RSA
	DROPBEAR_SIGNKEY_RSA,
#endif
#if DROPBEAR_DSS
	DROPBEAR_SIGNKEY_DSS,
#endif
#if DROPBEAR_ECDSA
	DROPBEAR_SIGNKEY_ECDSA_NISTP256,
	DROPBEAR_SIGNKEY_ECDSA_NISTP384,
	DROPBEAR_SIGNKEY_ECDSA_NISTP521,
#endif /* DROPBEAR_ECDSA */
#if DROPBEAR_ED25519
	DROPBEAR_SIGNKEY_ED25519,
#endif
	DROPBEAR_SIGNKEY_NUM_NAMED,
	DROPBEAR_SIGNKEY_ECDSA_KEYGEN = 70, /* just "ecdsa" for keygen */
	DROPBEAR_SIGNKEY_ANY = 80,
	DROPBEAR_SIGNKEY_NONE = 90,
};


/* Sources for signing keys */
typedef enum {
	SIGNKEY_SOURCE_RAW_FILE,
	SIGNKEY_SOURCE_AGENT,
	SIGNKEY_SOURCE_INVALID,	
} signkey_source;

struct SIGN_key {

	enum signkey_type type;
	signkey_source source;
	char *filename;

#if DROPBEAR_DSS
	dropbear_dss_key * dsskey;
#endif
#if DROPBEAR_RSA
	dropbear_rsa_key * rsakey;
#endif
#if DROPBEAR_ECDSA
#if DROPBEAR_ECC_256
	ecc_key * ecckey256;
#endif
#if DROPBEAR_ECC_384
	ecc_key * ecckey384;
#endif
#if DROPBEAR_ECC_521
	ecc_key * ecckey521;
#endif
#endif
#if DROPBEAR_ED25519
	dropbear_ed25519_key * ed25519key;
#endif
};

typedef struct SIGN_key sign_key;

sign_key * new_sign_key(void);
const char* signkey_name_from_type(enum signkey_type type, unsigned int *namelen);
enum signkey_type signkey_type_from_name(const char* name, unsigned int namelen);
int buf_get_pub_key(buffer *buf, sign_key *key, enum signkey_type *type);
int buf_get_priv_key(buffer* buf, sign_key *key, enum signkey_type *type);
void buf_put_pub_key(buffer* buf, sign_key *key, enum signkey_type type);
void buf_put_priv_key(buffer* buf, sign_key *key, enum signkey_type type);
void sign_key_free(sign_key *key);
void buf_put_sign(buffer* buf, sign_key *key, enum signkey_type type, const buffer *data_buf);
#if DROPBEAR_SIGNKEY_VERIFY
int buf_verify(buffer * buf, sign_key *key, const buffer *data_buf);
char * sign_key_fingerprint(const unsigned char* keyblob, unsigned int keybloblen);
#endif
int cmp_base64_key(const unsigned char* keyblob, unsigned int keybloblen, 
					const unsigned char* algoname, unsigned int algolen, 
					const buffer * line, char ** fingerprint);

void** signkey_key_ptr(sign_key *key, enum signkey_type type);

#endif /* DROPBEAR_SIGNKEY_H_ */