Mercurial > dropbear

annotate gendss.c @ 27:08da099e8337

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- Rename common-packet.c to packet.c - buf_burn the unencrypted read/write payload buffers after use to avoid sensitive contents sitting in memory for too long
author Matt Johnston <matt@ucc.asn.au>
date Tue, 27 Jul 2004 02:14:42 +0000
parents fe6bca95afa7
children aecba0e16e9c b0316ce64e4b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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4
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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 "random.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 PSIZE 128 /* 1024 bit*/
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35 #define QSIZE 20 /* 160 bit */
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36
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37 #ifdef DROPBEAR_DSS
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38
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39 static void getq(dss_key *key);
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40 static void getp(dss_key *key, unsigned int size);
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41 static void getg(dss_key *key);
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42 static void getx(dss_key *key);
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43 static void gety(dss_key *key);
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44
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45 dss_key * gen_dss_priv_key(unsigned int size) {
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46
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47 dss_key *key;
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48
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49 key = (dss_key*)m_malloc(sizeof(dss_key));
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50
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51 key->p = (mp_int*)m_malloc(sizeof(mp_int));
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52 key->q = (mp_int*)m_malloc(sizeof(mp_int));
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53 key->g = (mp_int*)m_malloc(sizeof(mp_int));
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54 key->y = (mp_int*)m_malloc(sizeof(mp_int));
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55 key->x = (mp_int*)m_malloc(sizeof(mp_int));
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56 m_mp_init_multi(key->p, key->q, key->g, key->y, key->x, NULL);
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57
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58 seedrandom();
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59
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60 getq(key);
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61 getp(key, size);
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62 getg(key);
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63 getx(key);
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64 gety(key);
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65
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66 return key;
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67
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68 }
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69
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70 static void getq(dss_key *key) {
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71
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72 char buf[QSIZE];
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73
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74 /* 160 bit prime */
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75 genrandom(buf, QSIZE);
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76 buf[0] |= 0x80; /* top bit high */
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77 buf[QSIZE-1] |= 0x01; /* bottom bit high */
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78
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79 if (mp_read_unsigned_bin(key->q, buf, QSIZE) != MP_OKAY) {
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80 fprintf(stderr, "dss key generation failed\n");
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81 exit(1);
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82 }
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83
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84 /* 18 rounds are required according to HAC */
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85 if (mp_prime_next_prime(key->q, 18, 0) != MP_OKAY) {
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86 fprintf(stderr, "dss key generation failed\n");
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87 exit(1);
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88 }
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89 }
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90
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91 static void getp(dss_key *key, unsigned int size) {
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92
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93 mp_int tempX, tempC, tempP, temp2q;
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94 int result;
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95 unsigned char *buf;
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96
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97 m_mp_init_multi(&tempX, &tempC, &tempP, &temp2q, NULL);
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98
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99
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100 /* 2*q */
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101 if (mp_mul_d(key->q, 2, &temp2q) != MP_OKAY) {
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102 fprintf(stderr, "dss key generation failed\n");
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103 exit(1);
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104 }
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105
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106 buf = (unsigned char*)m_malloc(size);
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107
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108 result = 0;
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109 do {
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110
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111 genrandom(buf, size);
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112 buf[0] |= 0x80; /* set the top bit high */
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113
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114 /* X is a random mp_int */
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115 if (mp_read_unsigned_bin(&tempX, buf, size) != MP_OKAY) {
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116 fprintf(stderr, "dss key generation failed\n");
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117 exit(1);
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118 }
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119
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120 /* C = X mod 2q */
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121 if (mp_mod(&tempX, &temp2q, &tempC) != MP_OKAY) {
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122 fprintf(stderr, "dss key generation failed\n");
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123 exit(1);
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124 }
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125
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126 /* P = X - (C - 1) = X - C + 1*/
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127 if (mp_sub(&tempX, &tempC, &tempP) != 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 if (mp_add_d(&tempP, 1, key->p) != MP_OKAY) {
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133 fprintf(stderr, "dss key generation failed\n");
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134 exit(1);
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135 }
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136
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137 /* now check for prime, 5 rounds is enough according to HAC */
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138 /* result == 1 => p is prime */
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139 if (mp_prime_is_prime(key->p, 5, &result) != MP_OKAY) {
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140 fprintf(stderr, "dss key generation failed\n");
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141 exit(1);
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142 }
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143 } while (!result);
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144
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145 mp_clear_multi(&tempX, &tempC, &tempP, &temp2q, NULL);
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146 m_free(buf);
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147 }
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148
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149 static void getg(dss_key * key) {
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150
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151 char printbuf[1000];
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152 mp_int div, h, val;
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153
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154 m_mp_init_multi(&div, &h, &val, NULL);
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155
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156 /* get div=(p-1)/q */
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157 if (mp_sub_d(key->p, 1, &val) != MP_OKAY) {
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158 fprintf(stderr, "dss key generation failed\n");
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159 exit(1);
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160 }
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161 if (mp_div(&val, key->q, &div, NULL) != MP_OKAY) {
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162 fprintf(stderr, "dss key generation failed\n");
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163 exit(1);
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164 }
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165
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166 /* initialise h=1 */
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167 mp_set(&h, 1);
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168 do {
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169 /* now keep going with g=h^div mod p, until g > 1 */
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170 if (mp_exptmod(&h, &div, key->p, key->g) != MP_OKAY) {
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171 fprintf(stderr, "dss key generation failed\n");
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172 exit(1);
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173 }
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174
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175 if (mp_add_d(&h, 1, &h) != MP_OKAY) {
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176 fprintf(stderr, "dss key generation failed\n");
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177 exit(1);
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178 }
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179
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180 } while (mp_cmp_d(key->g, 1) != MP_GT);
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181
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182 mp_toradix(key->g, printbuf, 10);
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183
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184 mp_clear_multi(&div, &h, &val, NULL);
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185 }
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186
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187 static void getx(dss_key *key) {
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188
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189 mp_int val;
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190 char buf[QSIZE];
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191
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192 m_mp_init(&val);
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193
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194 do {
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195 genrandom(buf, QSIZE);
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196
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197 if (mp_read_unsigned_bin(&val, buf, QSIZE) != MP_OKAY) {
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198 fprintf(stderr, "dss key generation failed\n");
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199 }
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200 } while ((mp_cmp_d(&val, 1) == MP_GT) && (mp_cmp(&val, key->q) == MP_LT));
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201
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202 mp_copy(&val, key->x);
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203 mp_clear(&val);
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204
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205 }
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206
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207 static void gety(dss_key *key) {
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208
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209 if (mp_exptmod(key->g, key->x, key->p, key->y) != MP_OKAY) {
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210 fprintf(stderr, "dss key generation failed\n");
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211 exit(1);
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212 }
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213 }
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214
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215 #endif /* DROPBEAR_DSS */