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 /common-algo.c | |
| 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 'common-algo.c')
| -rw-r--r-- | common-algo.c | 21 |
1 files changed, 18 insertions, 3 deletions
diff --git a/common-algo.c b/common-algo.c index 558aad2..eb1323f 100644 --- a/common-algo.c +++ b/common-algo.c @@ -30,6 +30,8 @@ #include "dh_groups.h" #include "ltc_prng.h" #include "ecc.h" +#include "gcm.h" +#include "chachapoly.h" /* This file (algo.c) organises the ciphers which can be used, and is used to * decide which ciphers/hashes/compression/signing to use during key exchange*/ @@ -86,11 +88,11 @@ const struct dropbear_cipher dropbear_nocipher = * about the symmetric_CBC vs symmetric_CTR cipher_state pointer */ #if DROPBEAR_ENABLE_CBC_MODE const struct dropbear_cipher_mode dropbear_mode_cbc = - {(void*)cbc_start, (void*)cbc_encrypt, (void*)cbc_decrypt}; + {(void*)cbc_start, (void*)cbc_encrypt, (void*)cbc_decrypt, NULL, NULL, NULL}; #endif /* DROPBEAR_ENABLE_CBC_MODE */ const struct dropbear_cipher_mode dropbear_mode_none = - {void_start, void_cipher, void_cipher}; + {void_start, void_cipher, void_cipher, NULL, NULL, NULL}; #if DROPBEAR_ENABLE_CTR_MODE /* a wrapper to make ctr_start and cbc_start look the same */ @@ -101,7 +103,7 @@ static int dropbear_big_endian_ctr_start(int cipher, return ctr_start(cipher, IV, key, keylen, num_rounds, CTR_COUNTER_BIG_ENDIAN, ctr); } const struct dropbear_cipher_mode dropbear_mode_ctr = - {(void*)dropbear_big_endian_ctr_start, (void*)ctr_encrypt, (void*)ctr_decrypt}; + {(void*)dropbear_big_endian_ctr_start, (void*)ctr_encrypt, (void*)ctr_decrypt, NULL, NULL, NULL}; #endif /* DROPBEAR_ENABLE_CTR_MODE */ /* Mapping of ssh hashes to libtomcrypt hashes, including keysize etc. @@ -137,6 +139,19 @@ const struct dropbear_hash dropbear_nohash = * that is also supported by the server will get used. */ algo_type sshciphers[] = { +#if DROPBEAR_CHACHA20POLY1305 + {"chacha20-poly1305@openssh.com", 0, &dropbear_chachapoly, 1, &dropbear_mode_chachapoly}, +#endif + +#if DROPBEAR_ENABLE_GCM_MODE +#if DROPBEAR_AES128 + {"aes128-gcm@openssh.com", 0, &dropbear_aes128, 1, &dropbear_mode_gcm}, +#endif +#if DROPBEAR_AES256 + {"aes256-gcm@openssh.com", 0, &dropbear_aes256, 1, &dropbear_mode_gcm}, +#endif +#endif /* DROPBEAR_ENABLE_GCM_MODE */ + #if DROPBEAR_ENABLE_CTR_MODE #if DROPBEAR_AES128 {"aes128-ctr", 0, &dropbear_aes128, 1, &dropbear_mode_ctr}, |