annotate chachapoly.c @ 1853:2be3115a8762 default tip main master

debugging test runner authorized_keys perms
author Matt Johnston <matt@ucc.asn.au>
date Tue, 19 Oct 2021 13:45:59 +0800
parents 5b701bf529aa
children
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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 "chachapoly.h"
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30
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31 #if DROPBEAR_CHACHA20POLY1305
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32
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33 #define CHACHA20_KEY_LEN 32
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34 #define CHACHA20_BLOCKSIZE 8
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35 #define POLY1305_KEY_LEN 32
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36 #define POLY1305_TAG_LEN 16
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37
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38 static const struct ltc_cipher_descriptor dummy = {.name = NULL};
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39
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40 static const struct dropbear_hash dropbear_chachapoly_mac =
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41 {NULL, POLY1305_KEY_LEN, POLY1305_TAG_LEN};
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42
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43 const struct dropbear_cipher dropbear_chachapoly =
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44 {&dummy, CHACHA20_KEY_LEN*2, CHACHA20_BLOCKSIZE};
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45
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46 static int dropbear_chachapoly_start(int UNUSED(cipher), const unsigned char* UNUSED(IV),
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47 const unsigned char *key, int keylen,
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48 int UNUSED(num_rounds), dropbear_chachapoly_state *state) {
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49 int err;
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50
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51 TRACE2(("enter dropbear_chachapoly_start"))
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52
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53 if (keylen != CHACHA20_KEY_LEN*2) {
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54 return CRYPT_ERROR;
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55 }
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56
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57 if ((err = chacha_setup(&state->chacha, key,
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58 CHACHA20_KEY_LEN, 20)) != CRYPT_OK) {
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59 return err;
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60 }
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61
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62 if ((err = chacha_setup(&state->header, key + CHACHA20_KEY_LEN,
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63 CHACHA20_KEY_LEN, 20) != CRYPT_OK)) {
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64 return err;
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65 }
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66
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67 TRACE2(("leave dropbear_chachapoly_start"))
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68 return CRYPT_OK;
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69 }
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70
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71 static int dropbear_chachapoly_crypt(unsigned int seq,
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72 const unsigned char *in, unsigned char *out,
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73 unsigned long len, unsigned long taglen,
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74 dropbear_chachapoly_state *state, int direction) {
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75 poly1305_state poly;
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76 unsigned char seqbuf[8], key[POLY1305_KEY_LEN], tag[POLY1305_TAG_LEN];
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77 int err;
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78
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79 TRACE2(("enter dropbear_chachapoly_crypt"))
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80
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81 if (len < 4 || taglen != POLY1305_TAG_LEN) {
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82 return CRYPT_ERROR;
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83 }
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84
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85 STORE64H((uint64_t)seq, seqbuf);
1672
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86 chacha_ivctr64(&state->chacha, seqbuf, sizeof(seqbuf), 0);
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87 if ((err = chacha_keystream(&state->chacha, key, sizeof(key))) != CRYPT_OK) {
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88 return err;
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89 }
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90
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91 poly1305_init(&poly, key, sizeof(key));
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92 if (direction == LTC_DECRYPT) {
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93 poly1305_process(&poly, in, len);
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94 poly1305_done(&poly, tag, &taglen);
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95 if (constant_time_memcmp(in + len, tag, taglen) != 0) {
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96 return CRYPT_ERROR;
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97 }
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98 }
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99
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100 chacha_ivctr64(&state->header, seqbuf, sizeof(seqbuf), 0);
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101 if ((err = chacha_crypt(&state->header, in, 4, out)) != CRYPT_OK) {
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102 return err;
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103 }
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104
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105 chacha_ivctr64(&state->chacha, seqbuf, sizeof(seqbuf), 1);
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106 if ((err = chacha_crypt(&state->chacha, in + 4, len - 4, out + 4)) != CRYPT_OK) {
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107 return err;
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108 }
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109
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110 if (direction == LTC_ENCRYPT) {
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111 poly1305_process(&poly, out, len);
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112 poly1305_done(&poly, out + len, &taglen);
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113 }
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114
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115 TRACE2(("leave dropbear_chachapoly_crypt"))
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116 return CRYPT_OK;
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117 }
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118
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119 static int dropbear_chachapoly_getlength(unsigned int seq,
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120 const unsigned char *in, unsigned int *outlen,
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121 unsigned long len, dropbear_chachapoly_state *state) {
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122 unsigned char seqbuf[8], buf[4];
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123 int err;
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124
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125 TRACE2(("enter dropbear_chachapoly_getlength"))
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126
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127 if (len < sizeof(buf)) {
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128 return CRYPT_ERROR;
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129 }
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130
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131 STORE64H((uint64_t)seq, seqbuf);
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132 chacha_ivctr64(&state->header, seqbuf, sizeof(seqbuf), 0);
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133 if ((err = chacha_crypt(&state->header, in, sizeof(buf), buf)) != CRYPT_OK) {
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134 return err;
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135 }
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136
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137 LOAD32H(*outlen, buf);
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138
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139 TRACE2(("leave dropbear_chachapoly_getlength"))
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140 return CRYPT_OK;
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141 }
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142
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143 const struct dropbear_cipher_mode dropbear_mode_chachapoly =
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144 {(void *)dropbear_chachapoly_start, NULL, NULL,
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145 (void *)dropbear_chachapoly_crypt,
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146 (void *)dropbear_chachapoly_getlength, &dropbear_chachapoly_mac};
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147
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148 #endif /* DROPBEAR_CHACHA20POLY1305 */