annotate genrsa.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 1051e4eea25a
children
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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 "bignum.h"
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28 #include "dbrandom.h"
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29 #include "rsa.h"
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30 #include "genrsa.h"
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31
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32 #define RSA_E 65537
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33
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34 #if DROPBEAR_RSA
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35
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36 static void getrsaprime(mp_int* prime, mp_int *primeminus,
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37 mp_int* rsa_e, unsigned int size_bytes);
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38
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39 /* mostly taken from libtomcrypt's rsa key generation routine */
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40 dropbear_rsa_key * gen_rsa_priv_key(unsigned int size) {
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41
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42 dropbear_rsa_key * key;
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43 DEF_MP_INT(pminus);
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44 DEF_MP_INT(qminus);
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45 DEF_MP_INT(lcm);
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46
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47 if (size < 512 || size > 4096 || (size % 8 != 0)) {
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48 dropbear_exit("Bits must satisfy 512 <= bits <= 4096, and be a"
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49 " multiple of 8");
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50 }
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51
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52 key = m_malloc(sizeof(*key));
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53 m_mp_alloc_init_multi(&key->e, &key->n, &key->d, &key->p, &key->q, NULL);
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54 m_mp_init_multi(&pminus, &lcm, &qminus, NULL);
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56 mp_set_ul(key->e, RSA_E);
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57
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58 while (1) {
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59 getrsaprime(key->p, &pminus, key->e, size/16);
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60 getrsaprime(key->q, &qminus, key->e, size/16);
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61
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62 if (mp_mul(key->p, key->q, key->n) != MP_OKAY) {
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63 fprintf(stderr, "RSA generation failed\n");
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64 exit(1);
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65 }
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66
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67 if ((unsigned int)mp_count_bits(key->n) == size) {
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68 break;
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69 }
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70 }
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71
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72 /* lcm(p-1, q-1) */
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73 if (mp_lcm(&pminus, &qminus, &lcm) != MP_OKAY) {
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74 fprintf(stderr, "RSA generation failed\n");
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75 exit(1);
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76 }
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77
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78 /* de = 1 mod lcm(p-1,q-1) */
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79 /* therefore d = (e^-1) mod lcm(p-1,q-1) */
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80 if (mp_invmod(key->e, &lcm, key->d) != MP_OKAY) {
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81 fprintf(stderr, "RSA 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 mp_clear_multi(&pminus, &qminus, &lcm, NULL);
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86
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87 return key;
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88 }
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89
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90 /* return a prime suitable for p or q */
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91 static void getrsaprime(mp_int* prime, mp_int *primeminus,
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92 mp_int* rsa_e, unsigned int size_bytes) {
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93
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94 unsigned char *buf;
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95 int trials;
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96 DEF_MP_INT(temp_gcd);
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97
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98 buf = (unsigned char*)m_malloc(size_bytes);
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99
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100 m_mp_init(&temp_gcd);
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101 do {
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102 /* generate a random odd number with MSB set, then find the
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103 the next prime above it */
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104 genrandom(buf, size_bytes);
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105 buf[0] |= 0x80;
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106
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107 bytes_to_mp(prime, buf, size_bytes);
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108
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109 /* find the next integer which is prime */
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110 trials = mp_prime_rabin_miller_trials(mp_count_bits(prime));
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111 if (mp_prime_next_prime(prime, trials, 0) != MP_OKAY) {
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112 fprintf(stderr, "RSA generation failed\n");
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113 exit(1);
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114 }
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115
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116 /* subtract one to get p-1 */
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117 if (mp_sub_d(prime, 1, primeminus) != MP_OKAY) {
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118 fprintf(stderr, "RSA generation failed\n");
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119 exit(1);
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120 }
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121 /* check relative primality to e */
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122 if (mp_gcd(primeminus, rsa_e, &temp_gcd) != MP_OKAY) {
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123 fprintf(stderr, "RSA generation failed\n");
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124 exit(1);
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125 }
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126 } while (mp_cmp_d(&temp_gcd, 1) != MP_EQ); /* while gcd(p-1, e) != 1 */
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127
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128 /* now we have a good value for result */
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129 mp_clear(&temp_gcd);
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130 m_burn(buf, size_bytes);
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131 m_free(buf);
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132 }
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133
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134 #endif /* DROPBEAR_RSA */