Mercurial > dropbear

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