[331] | 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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