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comparison gcm.c @ 1672:3a97f14c0235

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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
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Mon, 25 May 2020 20:50:25 +0500
parents
children 5b701bf529aa
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1671:5c8913b7464c 1672:3a97f14c0235
1 /*
2 * Dropbear SSH
3 *
4 * Copyright (c) 2002,2003 Matt Johnston
5 * Copyright (c) 2020 by Vladislav Grishenko
6 * All rights reserved.
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a copy
9 * of this software and associated documentation files (the "Software"), to deal
10 * in the Software without restriction, including without limitation the rights
11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
12 * copies of the Software, and to permit persons to whom the Software is
13 * furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice shall be included in
16 * all copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
21 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
24 * SOFTWARE. */
25
26 #include "includes.h"
27 #include "algo.h"
28 #include "dbutil.h"
29 #include "gcm.h"
30
31 #if DROPBEAR_ENABLE_GCM_MODE
32
33 #define GHASH_LEN 16
34
35 static const struct dropbear_hash dropbear_ghash =
36 {NULL, 0, GHASH_LEN};
37
38 static int dropbear_gcm_start(int cipher, const unsigned char *IV,
39 const unsigned char *key, int keylen,
40 int UNUSED(num_rounds), dropbear_gcm_state *state) {
41 int err;
42
43 TRACE2(("enter dropbear_gcm_start"))
44
45 if ((err = gcm_init(&state->gcm, cipher, key, keylen)) != CRYPT_OK) {
46 return err;
47 }
48 memcpy(state->iv, IV, GCM_NONCE_LEN);
49
50 TRACE2(("leave dropbear_gcm_start"))
51 return CRYPT_OK;
52 }
53
54 static int dropbear_gcm_crypt(unsigned int UNUSED(seq),
55 const unsigned char *in, unsigned char *out,
56 unsigned long len, unsigned long taglen,
57 dropbear_gcm_state *state, int direction) {
58 unsigned char *iv, tag[GHASH_LEN];
59 int i, err;
60
61 TRACE2(("enter dropbear_gcm_crypt"))
62
63 if (len < 4 || taglen != GHASH_LEN) {
64 return CRYPT_ERROR;
65 }
66
67 gcm_reset(&state->gcm);
68
69 if ((err = gcm_add_iv(&state->gcm,
70 state->iv, GCM_NONCE_LEN)) != CRYPT_OK) {
71 return err;
72 }
73
74 if ((err = gcm_add_aad(&state->gcm, in, 4)) != CRYPT_OK) {
75 return err;
76 }
77
78 if ((err = gcm_process(&state->gcm, (unsigned char *) in + 4,
79 len - 4, out + 4, direction)) != CRYPT_OK) {
80 return err;
81 }
82
83 if (direction == LTC_ENCRYPT) {
84 gcm_done(&state->gcm, out + len, &taglen);
85 } else {
86 gcm_done(&state->gcm, tag, &taglen);
87 if (constant_time_memcmp(in + len, tag, taglen) != 0) {
88 return CRYPT_ERROR;
89 }
90 }
91
92 /* increment invocation counter */
93 iv = state->iv + GCM_IVFIX_LEN;
94 for (i = GCM_IVCTR_LEN - 1; i >= 0 && ++iv[i] == 0; i--);
95
96 TRACE2(("leave dropbear_gcm_crypt"))
97 return CRYPT_OK;
98 }
99
100 static int dropbear_gcm_getlength(unsigned int UNUSED(seq),
101 const unsigned char *in, unsigned int *outlen,
102 unsigned long len, dropbear_gcm_state* UNUSED(state)) {
103 TRACE2(("enter dropbear_gcm_parse"))
104
105 if (len < 4) {
106 return CRYPT_ERROR;
107 }
108
109 LOAD32H(*outlen, in);
110
111 TRACE2(("leave dropbear_gcm_parse"))
112 return CRYPT_OK;
113 }
114
115 const struct dropbear_cipher_mode dropbear_mode_gcm =
116 {(void *)dropbear_gcm_start, NULL, NULL,
117 (void *)dropbear_gcm_crypt,
118 (void *)dropbear_gcm_getlength, &dropbear_ghash};
119
120 #endif /* DROPBEAR_ENABLE_GCM_MODE */