1 | /*
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2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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3 | *
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4 | * Licensed under the OpenSSL license (the "License"). You may not use
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5 | * this file except in compliance with the License. You can obtain a copy
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6 | * in the file LICENSE in the source distribution or at
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7 | * https://www.openssl.org/source/license.html
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8 | */
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9 |
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10 | #include <openssl/opensslconf.h>
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11 | #ifdef OPENSSL_NO_DSA
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12 | NON_EMPTY_TRANSLATION_UNIT
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13 | #else
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14 |
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15 | # include <stdio.h>
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16 | # include <stdlib.h>
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17 | # include <time.h>
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18 | # include <string.h>
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19 | # include "apps.h"
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20 | # include <openssl/bio.h>
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21 | # include <openssl/err.h>
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22 | # include <openssl/bn.h>
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23 | # include <openssl/dsa.h>
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24 | # include <openssl/x509.h>
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25 | # include <openssl/pem.h>
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26 |
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27 | # ifdef GENCB_TEST
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28 |
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29 | static int stop_keygen_flag = 0;
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30 |
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31 | static void timebomb_sigalarm(int foo)
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32 | {
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33 | stop_keygen_flag = 1;
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34 | }
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35 |
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36 | # endif
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37 |
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38 | static int dsa_cb(int p, int n, BN_GENCB *cb);
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39 |
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40 | typedef enum OPTION_choice {
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41 | OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
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42 | OPT_INFORM, OPT_OUTFORM, OPT_IN, OPT_OUT, OPT_TEXT, OPT_C,
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43 | OPT_NOOUT, OPT_GENKEY, OPT_RAND, OPT_ENGINE,
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44 | OPT_TIMEBOMB
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45 | } OPTION_CHOICE;
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46 |
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47 | OPTIONS dsaparam_options[] = {
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48 | {"help", OPT_HELP, '-', "Display this summary"},
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49 | {"inform", OPT_INFORM, 'F', "Input format - DER or PEM"},
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50 | {"in", OPT_IN, '<', "Input file"},
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51 | {"outform", OPT_OUTFORM, 'F', "Output format - DER or PEM"},
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52 | {"out", OPT_OUT, '>', "Output file"},
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53 | {"text", OPT_TEXT, '-', "Print as text"},
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54 | {"C", OPT_C, '-', "Output C code"},
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55 | {"noout", OPT_NOOUT, '-', "No output"},
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56 | {"genkey", OPT_GENKEY, '-', "Generate a DSA key"},
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57 | {"rand", OPT_RAND, 's', "Files to use for random number input"},
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58 | # ifdef GENCB_TEST
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59 | {"timebomb", OPT_TIMEBOMB, 'p', "Interrupt keygen after 'pnum' seconds"},
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60 | # endif
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61 | # ifndef OPENSSL_NO_ENGINE
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62 | {"engine", OPT_ENGINE, 's', "Use engine e, possibly a hardware device"},
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63 | # endif
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64 | {NULL}
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65 | };
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66 |
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67 | int dsaparam_main(int argc, char **argv)
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68 | {
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69 | ENGINE *e = NULL;
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70 | DSA *dsa = NULL;
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71 | BIO *in = NULL, *out = NULL;
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72 | BN_GENCB *cb = NULL;
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73 | int numbits = -1, num = 0, genkey = 0, need_rand = 0;
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74 | int informat = FORMAT_PEM, outformat = FORMAT_PEM, noout = 0, C = 0;
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75 | int ret = 1, i, text = 0, private = 0;
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76 | # ifdef GENCB_TEST
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77 | int timebomb = 0;
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78 | # endif
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79 | char *infile = NULL, *outfile = NULL, *prog, *inrand = NULL;
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80 | OPTION_CHOICE o;
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81 |
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82 | prog = opt_init(argc, argv, dsaparam_options);
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83 | while ((o = opt_next()) != OPT_EOF) {
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84 | switch (o) {
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85 | case OPT_EOF:
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86 | case OPT_ERR:
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87 | opthelp:
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88 | BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
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89 | goto end;
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90 | case OPT_HELP:
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91 | opt_help(dsaparam_options);
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92 | ret = 0;
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93 | goto end;
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94 | case OPT_INFORM:
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95 | if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
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96 | goto opthelp;
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97 | break;
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98 | case OPT_IN:
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99 | infile = opt_arg();
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100 | break;
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101 | case OPT_OUTFORM:
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102 | if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))
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103 | goto opthelp;
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104 | break;
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105 | case OPT_OUT:
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106 | outfile = opt_arg();
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107 | break;
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108 | case OPT_ENGINE:
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109 | e = setup_engine(opt_arg(), 0);
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110 | break;
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111 | case OPT_TIMEBOMB:
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112 | # ifdef GENCB_TEST
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113 | timebomb = atoi(opt_arg());
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114 | break;
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115 | # endif
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116 | case OPT_TEXT:
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117 | text = 1;
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118 | break;
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119 | case OPT_C:
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120 | C = 1;
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121 | break;
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122 | case OPT_GENKEY:
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123 | genkey = need_rand = 1;
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124 | break;
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125 | case OPT_RAND:
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126 | inrand = opt_arg();
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127 | need_rand = 1;
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128 | break;
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129 | case OPT_NOOUT:
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130 | noout = 1;
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131 | break;
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132 | }
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133 | }
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134 | argc = opt_num_rest();
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135 | argv = opt_rest();
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136 |
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137 | if (argc == 1) {
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138 | if (!opt_int(argv[0], &num) || num < 0)
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139 | goto end;
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140 | /* generate a key */
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141 | numbits = num;
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142 | need_rand = 1;
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143 | }
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144 | private = genkey ? 1 : 0;
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145 |
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146 | in = bio_open_default(infile, 'r', informat);
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147 | if (in == NULL)
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148 | goto end;
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149 | out = bio_open_owner(outfile, outformat, private);
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150 | if (out == NULL)
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151 | goto end;
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152 |
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153 | if (need_rand) {
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154 | app_RAND_load_file(NULL, (inrand != NULL));
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155 | if (inrand != NULL)
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156 | BIO_printf(bio_err, "%ld semi-random bytes loaded\n",
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157 | app_RAND_load_files(inrand));
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158 | }
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159 |
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160 | if (numbits > 0) {
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161 | cb = BN_GENCB_new();
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162 | if (cb == NULL) {
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163 | BIO_printf(bio_err, "Error allocating BN_GENCB object\n");
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164 | goto end;
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165 | }
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166 | BN_GENCB_set(cb, dsa_cb, bio_err);
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167 | assert(need_rand);
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168 | dsa = DSA_new();
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169 | if (dsa == NULL) {
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170 | BIO_printf(bio_err, "Error allocating DSA object\n");
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171 | goto end;
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172 | }
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173 | BIO_printf(bio_err, "Generating DSA parameters, %d bit long prime\n",
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174 | num);
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175 | BIO_printf(bio_err, "This could take some time\n");
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176 | # ifdef GENCB_TEST
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177 | if (timebomb > 0) {
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178 | struct sigaction act;
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179 | act.sa_handler = timebomb_sigalarm;
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180 | act.sa_flags = 0;
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181 | BIO_printf(bio_err,
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182 | "(though I'll stop it if not done within %d secs)\n",
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183 | timebomb);
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184 | if (sigaction(SIGALRM, &act, NULL) != 0) {
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185 | BIO_printf(bio_err, "Error, couldn't set SIGALRM handler\n");
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186 | goto end;
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187 | }
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188 | alarm(timebomb);
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189 | }
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190 | # endif
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191 | if (!DSA_generate_parameters_ex(dsa, num, NULL, 0, NULL, NULL, cb)) {
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192 | # ifdef GENCB_TEST
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193 | if (stop_keygen_flag) {
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194 | BIO_printf(bio_err, "DSA key generation time-stopped\n");
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195 | /* This is an asked-for behaviour! */
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196 | ret = 0;
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197 | goto end;
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198 | }
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199 | # endif
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200 | ERR_print_errors(bio_err);
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201 | BIO_printf(bio_err, "Error, DSA key generation failed\n");
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202 | goto end;
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203 | }
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204 | } else if (informat == FORMAT_ASN1)
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205 | dsa = d2i_DSAparams_bio(in, NULL);
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206 | else
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207 | dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL);
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208 | if (dsa == NULL) {
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209 | BIO_printf(bio_err, "unable to load DSA parameters\n");
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210 | ERR_print_errors(bio_err);
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211 | goto end;
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212 | }
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213 |
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214 | if (text) {
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215 | DSAparams_print(out, dsa);
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216 | }
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217 |
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218 | if (C) {
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219 | const BIGNUM *p = NULL, *q = NULL, *g = NULL;
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220 | unsigned char *data;
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221 | int len, bits_p;
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222 |
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223 | DSA_get0_pqg(dsa, &p, &q, &g);
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224 | len = BN_num_bytes(p);
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225 | bits_p = BN_num_bits(p);
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226 |
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227 | data = app_malloc(len + 20, "BN space");
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228 |
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229 | BIO_printf(bio_out, "DSA *get_dsa%d()\n{\n", bits_p);
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230 | print_bignum_var(bio_out, p, "dsap", len, data);
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231 | print_bignum_var(bio_out, q, "dsaq", len, data);
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232 | print_bignum_var(bio_out, g, "dsag", len, data);
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233 | BIO_printf(bio_out, " DSA *dsa = DSA_new();\n"
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234 | "\n");
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235 | BIO_printf(bio_out, " if (dsa == NULL)\n"
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236 | " return NULL;\n");
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237 | BIO_printf(bio_out, " dsa->p = BN_bin2bn(dsap_%d, sizeof (dsap_%d), NULL);\n",
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238 | bits_p, bits_p);
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239 | BIO_printf(bio_out, " dsa->q = BN_bin2bn(dsaq_%d, sizeof (dsaq_%d), NULL);\n",
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240 | bits_p, bits_p);
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241 | BIO_printf(bio_out, " dsa->g = BN_bin2bn(dsag_%d, sizeof (dsag_%d), NULL);\n",
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242 | bits_p, bits_p);
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243 | BIO_printf(bio_out, " if (!dsa->p || !dsa->q || !dsa->g) {\n"
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244 | " DSA_free(dsa);\n"
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245 | " return NULL;\n"
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246 | " }\n"
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247 | " return(dsa);\n}\n");
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248 | OPENSSL_free(data);
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249 | }
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250 |
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251 | if (!noout) {
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252 | if (outformat == FORMAT_ASN1)
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253 | i = i2d_DSAparams_bio(out, dsa);
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254 | else
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255 | i = PEM_write_bio_DSAparams(out, dsa);
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256 | if (!i) {
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257 | BIO_printf(bio_err, "unable to write DSA parameters\n");
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258 | ERR_print_errors(bio_err);
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259 | goto end;
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260 | }
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261 | }
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262 | if (genkey) {
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263 | DSA *dsakey;
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264 |
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265 | assert(need_rand);
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266 | if ((dsakey = DSAparams_dup(dsa)) == NULL)
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267 | goto end;
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268 | if (!DSA_generate_key(dsakey)) {
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269 | ERR_print_errors(bio_err);
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270 | DSA_free(dsakey);
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271 | goto end;
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272 | }
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273 | assert(private);
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274 | if (outformat == FORMAT_ASN1)
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275 | i = i2d_DSAPrivateKey_bio(out, dsakey);
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276 | else
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277 | i = PEM_write_bio_DSAPrivateKey(out, dsakey, NULL, NULL, 0, NULL,
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278 | NULL);
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279 | DSA_free(dsakey);
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280 | }
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281 | if (need_rand)
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282 | app_RAND_write_file(NULL);
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283 | ret = 0;
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284 | end:
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285 | BN_GENCB_free(cb);
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286 | BIO_free(in);
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287 | BIO_free_all(out);
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288 | DSA_free(dsa);
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289 | release_engine(e);
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290 | return (ret);
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291 | }
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292 |
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293 | static int dsa_cb(int p, int n, BN_GENCB *cb)
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294 | {
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295 | char c = '*';
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296 |
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297 | if (p == 0)
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298 | c = '.';
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299 | if (p == 1)
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300 | c = '+';
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301 | if (p == 2)
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302 | c = '*';
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303 | if (p == 3)
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304 | c = '\n';
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305 | BIO_write(BN_GENCB_get_arg(cb), &c, 1);
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306 | (void)BIO_flush(BN_GENCB_get_arg(cb));
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307 | # ifdef GENCB_TEST
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308 | if (stop_keygen_flag)
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309 | return 0;
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310 | # endif
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311 | return 1;
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312 | }
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313 | #endif
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