Mercurial > dropbear

annotate gcm.c @ 1830:c32976db772f

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Merge
author Matt Johnston <matt@ucc.asn.au>
date Mon, 11 Oct 2021 15:46:49 +0800
parents 5b701bf529aa
children
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rev   line source
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_getlength"))
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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_getlength"))
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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 */