Mercurial > dropbear
annotate genrsa.c @ 1928:333688ec53d0
Handle ecdsa-sk flags, reject no-touch
For the time being Dropbear will only allow SK auth with default
parameters, user-presence needs to be set.
In future handling of authorized_keys option "no-touch-required" can be
added.
This code would also be refactored to share between ecdsa and ed25519
once I get hardware/emulation to test ed25519.
author | Matt Johnston <matt@ucc.asn.au> |
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date | Wed, 30 Mar 2022 21:06:15 +0800 |
parents | 1051e4eea25a |
children |
rev | line source |
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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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55 |
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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 */ |