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 <string.h>
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17 | # include <sys/types.h>
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18 | # include <sys/stat.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 | typedef enum OPTION_choice {
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28 | OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
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29 | OPT_OUT, OPT_PASSOUT, OPT_ENGINE, OPT_RAND, OPT_CIPHER
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30 | } OPTION_CHOICE;
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31 |
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32 | OPTIONS gendsa_options[] = {
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33 | {OPT_HELP_STR, 1, '-', "Usage: %s [args] dsaparam-file\n"},
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34 | {OPT_HELP_STR, 1, '-', "Valid options are:\n"},
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35 | {"help", OPT_HELP, '-', "Display this summary"},
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36 | {"out", OPT_OUT, '>', "Output the key to the specified file"},
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37 | {"passout", OPT_PASSOUT, 's', "Output file pass phrase source"},
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38 | {"rand", OPT_RAND, 's',
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39 | "Load the file(s) into the random number generator"},
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40 | {"", OPT_CIPHER, '-', "Encrypt the output with any supported cipher"},
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41 | # ifndef OPENSSL_NO_ENGINE
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42 | {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
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43 | # endif
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44 | {NULL}
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45 | };
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46 |
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47 | int gendsa_main(int argc, char **argv)
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48 | {
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49 | ENGINE *e = NULL;
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50 | BIO *out = NULL, *in = NULL;
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51 | DSA *dsa = NULL;
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52 | const EVP_CIPHER *enc = NULL;
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53 | char *inrand = NULL, *dsaparams = NULL;
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54 | char *outfile = NULL, *passoutarg = NULL, *passout = NULL, *prog;
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55 | OPTION_CHOICE o;
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56 | int ret = 1, private = 0;
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57 | const BIGNUM *p = NULL;
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58 |
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59 | prog = opt_init(argc, argv, gendsa_options);
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60 | while ((o = opt_next()) != OPT_EOF) {
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61 | switch (o) {
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62 | case OPT_EOF:
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63 | case OPT_ERR:
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64 | opthelp:
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65 | BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
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66 | goto end;
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67 | case OPT_HELP:
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68 | ret = 0;
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69 | opt_help(gendsa_options);
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70 | goto end;
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71 | case OPT_OUT:
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72 | outfile = opt_arg();
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73 | break;
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74 | case OPT_PASSOUT:
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75 | passoutarg = opt_arg();
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76 | break;
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77 | case OPT_ENGINE:
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78 | e = setup_engine(opt_arg(), 0);
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79 | break;
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80 | case OPT_RAND:
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81 | inrand = opt_arg();
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82 | break;
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83 | case OPT_CIPHER:
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84 | if (!opt_cipher(opt_unknown(), &enc))
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85 | goto end;
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86 | break;
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87 | }
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88 | }
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89 | argc = opt_num_rest();
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90 | argv = opt_rest();
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91 | private = 1;
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92 |
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93 | if (argc != 1)
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94 | goto opthelp;
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95 | dsaparams = *argv;
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96 |
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97 | if (!app_passwd(NULL, passoutarg, NULL, &passout)) {
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98 | BIO_printf(bio_err, "Error getting password\n");
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99 | goto end;
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100 | }
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101 |
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102 | in = bio_open_default(dsaparams, 'r', FORMAT_PEM);
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103 | if (in == NULL)
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104 | goto end2;
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105 |
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106 | if ((dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL)) == NULL) {
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107 | BIO_printf(bio_err, "unable to load DSA parameter file\n");
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108 | goto end;
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109 | }
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110 | BIO_free(in);
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111 | in = NULL;
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112 |
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113 | out = bio_open_owner(outfile, FORMAT_PEM, private);
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114 | if (out == NULL)
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115 | goto end2;
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116 |
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117 | if (!app_RAND_load_file(NULL, 1) && inrand == NULL) {
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118 | BIO_printf(bio_err,
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119 | "warning, not much extra random data, consider using the -rand option\n");
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120 | }
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121 | if (inrand != NULL)
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122 | BIO_printf(bio_err, "%ld semi-random bytes loaded\n",
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123 | app_RAND_load_files(inrand));
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124 |
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125 | DSA_get0_pqg(dsa, &p, NULL, NULL);
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126 | BIO_printf(bio_err, "Generating DSA key, %d bits\n", BN_num_bits(p));
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127 | if (!DSA_generate_key(dsa))
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128 | goto end;
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129 |
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130 | app_RAND_write_file(NULL);
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131 |
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132 | assert(private);
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133 | if (!PEM_write_bio_DSAPrivateKey(out, dsa, enc, NULL, 0, NULL, passout))
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134 | goto end;
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135 | ret = 0;
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136 | end:
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137 | if (ret != 0)
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138 | ERR_print_errors(bio_err);
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139 | end2:
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140 | BIO_free(in);
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141 | BIO_free_all(out);
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142 | DSA_free(dsa);
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143 | release_engine(e);
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144 | OPENSSL_free(passout);
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145 | return (ret);
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146 | }
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147 | #endif
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