diff options
| author | Vladislav Grishenko <themiron@users.noreply.github.com> | 2020-05-25 20:50:25 +0500 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2020-05-25 23:50:25 +0800 |
| commit | d3d0d60076dd598f1e7aafbe564ff714cc3c19a9 (patch) | |
| tree | 334cf2a95ca2df7f82f746836c1a4c6d5a3a95b2 /default_options.h | |
| parent | 91e537e4275a1e0b265074bc73072cc508e18846 (diff) | |
Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
* Add Chacha20-Poly1305 authenticated encryption
* Add general AEAD approach.
* Add chacha20-poly1305@openssh.com 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 aes128-gcm@openssh.com and aes256-gcm@openssh.com 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
Diffstat (limited to 'default_options.h')
| -rw-r--r-- | default_options.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/default_options.h b/default_options.h index bafbb07..2ca01b3 100644 --- a/default_options.h +++ b/default_options.h @@ -99,6 +99,19 @@ IMPORTANT: Some options will require "make clean" after changes */ * and forwards compatibility */ #define DROPBEAR_ENABLE_CTR_MODE 1 +/* Enable "Galois/Counter Mode" for ciphers. This authenticated + * encryption mode is combination of CTR mode and GHASH. Recommended + * for security and forwards compatibility, but slower than CTR on + * CPU w/o dedicated AES/GHASH instructions. + * Compiling in will add ~6kB to binary size on x86-64 */ +#define DROPBEAR_ENABLE_GCM_MODE 0 + +/* Enable Chacha20-Poly1305 authenticated encryption mode. This 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 */ +#define DROPBEAR_CHACHA20POLY1305 1 + /* Message integrity. sha2-256 is recommended as a default, sha1 for compatibility */ #define DROPBEAR_SHA1_HMAC 1 |