annotate gendss.c @ 858:220f55d540ae

rename random.h to dbrandom.h since some OSes have a system random.h
author Matt Johnston <matt@ucc.asn.au>
date Thu, 14 Nov 2013 22:05:47 +0800
parents 724c3e0c8734
children c45d65392c1a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Dropbear - a SSH2 server
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3 *
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4 * Copyright (c) 2002,2003 Matt Johnston
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5 * All rights reserved.
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6 *
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy
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8 * of this software and associated documentation files (the "Software"), to deal
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9 * in the Software without restriction, including without limitation the rights
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 * copies of the Software, and to permit persons to whom the Software is
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12 * furnished to do so, subject to the following conditions:
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13 *
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14 * The above copyright notice and this permission notice shall be included in
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15 * all copies or substantial portions of the Software.
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16 *
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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23 * SOFTWARE. */
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24
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25 #include "includes.h"
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26 #include "dbutil.h"
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27 #include "signkey.h"
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28 #include "bignum.h"
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29 #include "dbrandom.h"
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30 #include "buffer.h"
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31 #include "gendss.h"
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32 #include "dss.h"
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33
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34 #define QSIZE 20 /* 160 bit */
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35
60
2ca590852f45 Just a test for merging heads
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36 /* This is just a test */
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37
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38 #ifdef DROPBEAR_DSS
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39
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40 static void getq(dropbear_dss_key *key);
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41 static void getp(dropbear_dss_key *key, unsigned int size);
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42 static void getg(dropbear_dss_key *key);
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43 static void getx(dropbear_dss_key *key);
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44 static void gety(dropbear_dss_key *key);
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46 dropbear_dss_key * gen_dss_priv_key(unsigned int size) {
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47
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48 dropbear_dss_key *key;
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49
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50 if (size != 1024) {
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51 dropbear_exit("DSS keys have a fixed size of 1024 bits");
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52 }
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53
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54 key = m_malloc(sizeof(*key));
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56 m_mp_alloc_init_multi(&key->p, &key->q, &key->g, &key->y, &key->x, NULL);
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58 getq(key);
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59 getp(key, size/8);
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60 getg(key);
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61 getx(key);
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62 gety(key);
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63
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64 return key;
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65
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66 }
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67
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68 static void getq(dropbear_dss_key *key) {
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70 char buf[QSIZE];
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71
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72 /* 160 bit prime */
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73 genrandom(buf, QSIZE);
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74 buf[0] |= 0x80; /* top bit high */
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75 buf[QSIZE-1] |= 0x01; /* bottom bit high */
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76
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77 bytes_to_mp(key->q, buf, QSIZE);
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79 /* 18 rounds are required according to HAC */
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80 if (mp_prime_next_prime(key->q, 18, 0) != MP_OKAY) {
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81 fprintf(stderr, "DSS key generation failed\n");
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82 exit(1);
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83 }
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84 }
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85
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86 static void getp(dropbear_dss_key *key, unsigned int size) {
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88 DEF_MP_INT(tempX);
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89 DEF_MP_INT(tempC);
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90 DEF_MP_INT(tempP);
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91 DEF_MP_INT(temp2q);
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92 int result;
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93 unsigned char *buf;
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94
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95 m_mp_init_multi(&tempX, &tempC, &tempP, &temp2q, NULL);
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97
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98 /* 2*q */
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99 if (mp_mul_d(key->q, 2, &temp2q) != MP_OKAY) {
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100 fprintf(stderr, "DSS key generation failed\n");
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101 exit(1);
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102 }
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103
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104 buf = (unsigned char*)m_malloc(size);
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105
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106 result = 0;
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107 do {
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108
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109 genrandom(buf, size);
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110 buf[0] |= 0x80; /* set the top bit high */
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111
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112 /* X is a random mp_int */
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113 bytes_to_mp(&tempX, buf, size);
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114
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115 /* C = X mod 2q */
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116 if (mp_mod(&tempX, &temp2q, &tempC) != MP_OKAY) {
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117 fprintf(stderr, "DSS key generation failed\n");
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118 exit(1);
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119 }
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120
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121 /* P = X - (C - 1) = X - C + 1*/
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122 if (mp_sub(&tempX, &tempC, &tempP) != MP_OKAY) {
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123 fprintf(stderr, "DSS key generation failed\n");
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124 exit(1);
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125 }
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126
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127 if (mp_add_d(&tempP, 1, key->p) != MP_OKAY) {
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128 fprintf(stderr, "DSS key generation failed\n");
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129 exit(1);
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130 }
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131
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132 /* now check for prime, 5 rounds is enough according to HAC */
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133 /* result == 1 => p is prime */
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134 if (mp_prime_is_prime(key->p, 5, &result) != MP_OKAY) {
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135 fprintf(stderr, "DSS key generation failed\n");
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136 exit(1);
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137 }
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138 } while (!result);
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139
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140 mp_clear_multi(&tempX, &tempC, &tempP, &temp2q, NULL);
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141 m_burn(buf, size);
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142 m_free(buf);
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143 }
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144
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145 static void getg(dropbear_dss_key * key) {
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146
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147 DEF_MP_INT(div);
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148 DEF_MP_INT(h);
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149 DEF_MP_INT(val);
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150
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151 m_mp_init_multi(&div, &h, &val, NULL);
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152
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153 /* get div=(p-1)/q */
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154 if (mp_sub_d(key->p, 1, &val) != MP_OKAY) {
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155 fprintf(stderr, "DSS key generation failed\n");
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156 exit(1);
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157 }
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158 if (mp_div(&val, key->q, &div, NULL) != MP_OKAY) {
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159 fprintf(stderr, "DSS key generation failed\n");
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160 exit(1);
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161 }
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162
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163 /* initialise h=1 */
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164 mp_set(&h, 1);
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165 do {
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166 /* now keep going with g=h^div mod p, until g > 1 */
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167 if (mp_exptmod(&h, &div, key->p, key->g) != MP_OKAY) {
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168 fprintf(stderr, "DSS key generation failed\n");
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169 exit(1);
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170 }
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171
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172 if (mp_add_d(&h, 1, &h) != MP_OKAY) {
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173 fprintf(stderr, "DSS key generation failed\n");
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174 exit(1);
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175 }
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176
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177 } while (mp_cmp_d(key->g, 1) != MP_GT);
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178
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179 mp_clear_multi(&div, &h, &val, NULL);
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180 }
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181
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182 static void getx(dropbear_dss_key *key) {
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183
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184 gen_random_mpint(key->q, key->x);
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185 }
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186
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187 static void gety(dropbear_dss_key *key) {
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188
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189 if (mp_exptmod(key->g, key->x, key->p, key->y) != MP_OKAY) {
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190 fprintf(stderr, "DSS key generation failed\n");
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191 exit(1);
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192 }
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193 }
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194
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195 #endif /* DROPBEAR_DSS */