apps/dsaparam.c

   1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   2  * All rights reserved.
   3  *
   4  * This package is an SSL implementation written
   5  * by Eric Young (eay@cryptsoft.com).
   6  * The implementation was written so as to conform with Netscapes SSL.
   7  *
   8  * This library is free for commercial and non-commercial use as long as
   9  * the following conditions are aheared to.  The following conditions
  10  * apply to all code found in this distribution, be it the RC4, RSA,
  11  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  12  * included with this distribution is covered by the same copyright terms
  13  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  14  *
  15  * Copyright remains Eric Young's, and as such any Copyright notices in
  16  * the code are not to be removed.
  17  * If this package is used in a product, Eric Young should be given attribution
  18  * as the author of the parts of the library used.
  19  * This can be in the form of a textual message at program startup or
  20  * in documentation (online or textual) provided with the package.
  21  *
  22  * Redistribution and use in source and binary forms, with or without
  23  * modification, are permitted provided that the following conditions
  24  * are met:
  25  * 1. Redistributions of source code must retain the copyright
  26  *    notice, this list of conditions and the following disclaimer.
  27  * 2. Redistributions in binary form must reproduce the above copyright
  28  *    notice, this list of conditions and the following disclaimer in the
  29  *    documentation and/or other materials provided with the distribution.
  30  * 3. All advertising materials mentioning features or use of this software
  31  *    must display the following acknowledgement:
  32  *    "This product includes cryptographic software written by
  33  *     Eric Young (eay@cryptsoft.com)"
  34  *    The word 'cryptographic' can be left out if the rouines from the library
  35  *    being used are not cryptographic related :-).
  36  * 4. If you include any Windows specific code (or a derivative thereof) from
  37  *    the apps directory (application code) you must include an acknowledgement:
  38  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  50  * SUCH DAMAGE.
  51  *
  52  * The licence and distribution terms for any publically available version or
  53  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  54  * copied and put under another distribution licence
  55  * [including the GNU Public Licence.]
  56  */
  57
  58 #include <openssl/opensslconf.h> /* for OPENSSL_NO_DSA */
  59
  60 #ifndef OPENSSL_NO_DSA
  61 # include <assert.h>
  62 # include <stdio.h>
  63 # include <stdlib.h>
  64 # include <time.h>
  65 # include <string.h>
  66 # include "apps.h"
  67 # include <openssl/bio.h>
  68 # include <openssl/err.h>
  69 # include <openssl/bn.h>
  70 # include <openssl/dsa.h>
  71 # include <openssl/x509.h>
  72 # include <openssl/pem.h>
  73
  74 # ifdef GENCB_TEST
  75
  76 static int stop_keygen_flag = 0;
  77
  78 static void timebomb_sigalarm(int foo)
  79 {
  80     stop_keygen_flag = 1;
  81 }
  82
  83 # endif
  84
  85 static int dsa_cb(int p, int n, BN_GENCB *cb);
  86
  87 typedef enum OPTION_choice {
  88     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  89     OPT_INFORM, OPT_OUTFORM, OPT_IN, OPT_OUT, OPT_TEXT, OPT_C,
  90     OPT_NOOUT, OPT_GENKEY, OPT_RAND, OPT_NON_FIPS_ALLOW, OPT_ENGINE,
  91     OPT_TIMEBOMB
  92 } OPTION_CHOICE;
  93
  94 OPTIONS dsaparam_options[] = {
  95     {"help", OPT_HELP, '-', "Display this summary"},
  96     {"inform", OPT_INFORM, 'F', "Input format - DER or PEM"},
  97     {"in", OPT_IN, '<', "Input file"},
  98     {"outform", OPT_OUTFORM, 'F', "Output format - DER or PEM"},
  99     {"out", OPT_OUT, '>', "Output file"},
 100     {"text", OPT_TEXT, '-', "Print as text"},
 101     {"C", OPT_C, '-', "Output C code"},
 102     {"noout", OPT_NOOUT, '-', "No output"},
 103     {"genkey", OPT_GENKEY, '-', "Generate a DSA key"},
 104     {"rand", OPT_RAND, 's', "Files to use for random number input"},
 105     {"non-fips-allow", OPT_NON_FIPS_ALLOW, '-'},
 106 # ifndef OPENSSL_NO_ENGINE
 107     {"engine", OPT_ENGINE, 's', "Use engine e, possibly a hardware device"},
 108 # endif
 109 # ifdef GENCB_TEST
 110     {"timebomb", OPT_TIMEBOMB, 'p', "Interrupt keygen after 'pnum' seconds"},
 111 # endif
 112     {NULL}
 113 };
 114
 115 int dsaparam_main(int argc, char **argv)
 116 {
 117     DSA *dsa = NULL;
 118     BIO *in = NULL, *out = NULL;
 119     BN_GENCB *cb = NULL;
 120     int numbits = -1, num, genkey = 0, need_rand = 0, non_fips_allow = 0;
 121     int informat = FORMAT_PEM, outformat = FORMAT_PEM, noout = 0, C = 0, ret =
 122         1;
 123     int i, text = 0;
 124 # ifdef GENCB_TEST
 125     int timebomb = 0;
 126 # endif
 127     char *infile = NULL, *outfile = NULL, *prog, *inrand = NULL;
 128     OPTION_CHOICE o;
 129
 130     prog = opt_init(argc, argv, dsaparam_options);
 131     while ((o = opt_next()) != OPT_EOF) {
 132         switch (o) {
 133         case OPT_EOF:
 134         case OPT_ERR:
 135  opthelp:
 136             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 137             goto end;
 138         case OPT_HELP:
 139             opt_help(dsaparam_options);
 140             ret = 0;
 141             goto end;
 142         case OPT_INFORM:
 143             if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
 144                 goto opthelp;
 145             break;
 146         case OPT_IN:
 147             infile = opt_arg();
 148             break;
 149         case OPT_OUTFORM:
 150             if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))
 151                 goto opthelp;
 152             break;
 153         case OPT_OUT:
 154             outfile = opt_arg();
 155             break;
 156         case OPT_ENGINE:
 157             (void)setup_engine(opt_arg(), 0);
 158             break;
 159         case OPT_TIMEBOMB:
 160 # ifdef GENCB_TEST
 161             timebomb = atoi(opt_arg());
 162             break;
 163 # endif
 164         case OPT_TEXT:
 165             text = 1;
 166             break;
 167         case OPT_C:
 168             C = 1;
 169             break;
 170         case OPT_GENKEY:
 171             genkey = need_rand = 1;
 172             break;
 173         case OPT_RAND:
 174             inrand = opt_arg();
 175             need_rand = 1;
 176             break;
 177         case OPT_NOOUT:
 178             noout = 1;
 179             break;
 180         case OPT_NON_FIPS_ALLOW:
 181             non_fips_allow = 1;
 182             break;
 183         }
 184     }
 185     argc = opt_num_rest();
 186     argv = opt_rest();
 187
 188     if (argc == 1) {
 189         if (!opt_int(argv[0], &num))
 190             goto end;
 191         /* generate a key */
 192         numbits = num;
 193         need_rand = 1;
 194     }
 195
 196     in = bio_open_default(infile, "r");
 197     if (in == NULL)
 198         goto end;
 199     out = bio_open_default(outfile, "w");
 200     if (out == NULL)
 201         goto end;
 202
 203     if (need_rand) {
 204         app_RAND_load_file(NULL, (inrand != NULL));
 205         if (inrand != NULL)
 206             BIO_printf(bio_err, "%ld semi-random bytes loaded\n",
 207                        app_RAND_load_files(inrand));
 208     }
 209
 210     if (numbits > 0) {
 211         cb = BN_GENCB_new();
 212         if (!cb) {
 213             BIO_printf(bio_err, "Error allocating BN_GENCB object\n");
 214             goto end;
 215         }
 216         BN_GENCB_set(cb, dsa_cb, bio_err);
 217         assert(need_rand);
 218         dsa = DSA_new();
 219         if (!dsa) {
 220             BIO_printf(bio_err, "Error allocating DSA object\n");
 221             goto end;
 222         }
 223         if (non_fips_allow)
 224             dsa->flags |= DSA_FLAG_NON_FIPS_ALLOW;
 225         BIO_printf(bio_err, "Generating DSA parameters, %d bit long prime\n",
 226                    num);
 227         BIO_printf(bio_err, "This could take some time\n");
 228 # ifdef GENCB_TEST
 229         if (timebomb > 0) {
 230             struct sigaction act;
 231             act.sa_handler = timebomb_sigalarm;
 232             act.sa_flags = 0;
 233             BIO_printf(bio_err,
 234                        "(though I'll stop it if not done within %d secs)\n",
 235                        timebomb);
 236             if (sigaction(SIGALRM, &act, NULL) != 0) {
 237                 BIO_printf(bio_err, "Error, couldn't set SIGALRM handler\n");
 238                 goto end;
 239             }
 240             alarm(timebomb);
 241         }
 242 # endif
 243         if (!DSA_generate_parameters_ex(dsa, num, NULL, 0, NULL, NULL, cb)) {
 244 # ifdef GENCB_TEST
 245             if (stop_keygen_flag) {
 246                 BIO_printf(bio_err, "DSA key generation time-stopped\n");
 247                 /* This is an asked-for behaviour! */
 248                 ret = 0;
 249                 goto end;
 250             }
 251 # endif
 252             ERR_print_errors(bio_err);
 253             BIO_printf(bio_err, "Error, DSA key generation failed\n");
 254             goto end;
 255         }
 256     } else if (informat == FORMAT_ASN1)
 257         dsa = d2i_DSAparams_bio(in, NULL);
 258     else
 259         dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL);
 260     if (dsa == NULL) {
 261         BIO_printf(bio_err, "unable to load DSA parameters\n");
 262         ERR_print_errors(bio_err);
 263         goto end;
 264     }
 265
 266     if (text) {
 267         DSAparams_print(out, dsa);
 268     }
 269
 270     if (C) {
 271         unsigned char *data;
 272         int len, bits_p;
 273
 274         len = BN_num_bytes(dsa->p);
 275         bits_p = BN_num_bits(dsa->p);
 276         data = (unsigned char *)OPENSSL_malloc(len + 20);
 277         if (data == NULL) {
 278             perror("OPENSSL_malloc");
 279             goto end;
 280         }
 281
 282         BIO_printf(bio_out, "DSA *get_dsa%d()\n{\n", bits_p);
 283         print_bignum_var(bio_out, dsa->p, "dsap", len, data);
 284         print_bignum_var(bio_out, dsa->q, "dsaq", len, data);
 285         print_bignum_var(bio_out, dsa->g, "dsag", len, data);
 286         BIO_printf(bio_out, "    DSA *dsa = DSA_new();\n"
 287                             "\n");
 288         BIO_printf(bio_out, "    if (dsa == NULL)\n"
 289                             "        return NULL;\n");
 290         BIO_printf(bio_out, "    dsa->p = BN_bin2bn(dsap_%d, sizeof (dsap_%d), NULL);\n",
 291                bits_p, bits_p);
 292         BIO_printf(bio_out, "    dsa->q = BN_bin2bn(dsaq_%d, sizeof (dsaq_%d), NULL);\n",
 293                bits_p, bits_p);
 294         BIO_printf(bio_out, "    dsa->g = BN_bin2bn(dsag_%d, sizeof (dsag_%d), NULL);\n",
 295                bits_p, bits_p);
 296         BIO_printf(bio_out, "    if (!dsa->p || !dsa->q || !dsa->g) {\n"
 297                             "        DSA_free(dsa);\n"
 298                             "        return NULL;\n"
 299                             "    }\n"
 300                             "    return(dsa);\n}\n");
 301     }
 302
 303     if (!noout) {
 304         if (outformat == FORMAT_ASN1)
 305             i = i2d_DSAparams_bio(out, dsa);
 306         else
 307             i = PEM_write_bio_DSAparams(out, dsa);
 308         if (!i) {
 309             BIO_printf(bio_err, "unable to write DSA parameters\n");
 310             ERR_print_errors(bio_err);
 311             goto end;
 312         }
 313     }
 314     if (genkey) {
 315         DSA *dsakey;
 316
 317         assert(need_rand);
 318         if ((dsakey = DSAparams_dup(dsa)) == NULL)
 319             goto end;
 320         if (non_fips_allow)
 321             dsakey->flags |= DSA_FLAG_NON_FIPS_ALLOW;
 322         if (!DSA_generate_key(dsakey)) {
 323             ERR_print_errors(bio_err);
 324             DSA_free(dsakey);
 325             goto end;
 326         }
 327         if (outformat == FORMAT_ASN1)
 328             i = i2d_DSAPrivateKey_bio(out, dsakey);
 329         else
 330             i = PEM_write_bio_DSAPrivateKey(out, dsakey, NULL, NULL, 0, NULL,
 331                                             NULL);
 332         DSA_free(dsakey);
 333     }
 334     if (need_rand)
 335         app_RAND_write_file(NULL);
 336     ret = 0;
 337  end:
 338     if (cb != NULL)
 339         BN_GENCB_free(cb);
 340     BIO_free(in);
 341     BIO_free_all(out);
 342     DSA_free(dsa);
 343     return (ret);
 344 }
 345
 346 static int dsa_cb(int p, int n, BN_GENCB *cb)
 347 {
 348     char c = '*';
 349
 350     if (p == 0)
 351         c = '.';
 352     if (p == 1)
 353         c = '+';
 354     if (p == 2)
 355         c = '*';
 356     if (p == 3)
 357         c = '\n';
 358     BIO_write(BN_GENCB_get_arg(cb), &c, 1);
 359     (void)BIO_flush(BN_GENCB_get_arg(cb));
 360 # ifdef GENCB_TEST
 361     if (stop_keygen_flag)
 362         return 0;
 363 # endif
 364     return 1;
 365 }
 366 #else                           /* !OPENSSL_NO_DSA */
 367
 368 # if PEDANTIC
 369 static void *dummy = &dummy;
 370 # endif
 371
 372 #endif