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>
  59 #ifdef OPENSSL_NO_DSA
  60 NON_EMPTY_TRANSLATION_UNIT
  61 #else
  62
  63 # include <stdio.h>
  64 # include <stdlib.h>
  65 # include <time.h>
  66 # include <string.h>
  67 # include "apps.h"
  68 # include <openssl/bio.h>
  69 # include <openssl/err.h>
  70 # include <openssl/bn.h>
  71 # include <openssl/dsa.h>
  72 # include <openssl/x509.h>
  73 # include <openssl/pem.h>
  74
  75 # ifdef GENCB_TEST
  76
  77 static int stop_keygen_flag = 0;
  78
  79 static void timebomb_sigalarm(int foo)
  80 {
  81     stop_keygen_flag = 1;
  82 }
  83
  84 # endif
  85
  86 static int dsa_cb(int p, int n, BN_GENCB *cb);
  87
  88 typedef enum OPTION_choice {
  89     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  90     OPT_INFORM, OPT_OUTFORM, OPT_IN, OPT_OUT, OPT_TEXT, OPT_C,
  91     OPT_NOOUT, OPT_GENKEY, OPT_RAND, OPT_ENGINE,
  92     OPT_TIMEBOMB
  93 } OPTION_CHOICE;
  94
  95 OPTIONS dsaparam_options[] = {
  96     {"help", OPT_HELP, '-', "Display this summary"},
  97     {"inform", OPT_INFORM, 'F', "Input format - DER or PEM"},
  98     {"in", OPT_IN, '<', "Input file"},
  99     {"outform", OPT_OUTFORM, 'F', "Output format - DER or PEM"},
 100     {"out", OPT_OUT, '>', "Output file"},
 101     {"text", OPT_TEXT, '-', "Print as text"},
 102     {"C", OPT_C, '-', "Output C code"},
 103     {"noout", OPT_NOOUT, '-', "No output"},
 104     {"genkey", OPT_GENKEY, '-', "Generate a DSA key"},
 105     {"rand", OPT_RAND, 's', "Files to use for random number input"},
 106 # ifdef GENCB_TEST
 107     {"timebomb", OPT_TIMEBOMB, 'p', "Interrupt keygen after 'pnum' seconds"},
 108 # endif
 109 # ifndef OPENSSL_NO_ENGINE
 110     {"engine", OPT_ENGINE, 's', "Use engine e, possibly a hardware device"},
 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 = 0, genkey = 0, need_rand = 0;
 121     int informat = FORMAT_PEM, outformat = FORMAT_PEM, noout = 0, C = 0;
 122     int ret = 1, i, text = 0, private = 0;
 123 # ifdef GENCB_TEST
 124     int timebomb = 0;
 125 # endif
 126     char *infile = NULL, *outfile = NULL, *prog, *inrand = NULL;
 127     OPTION_CHOICE o;
 128
 129     prog = opt_init(argc, argv, dsaparam_options);
 130     while ((o = opt_next()) != OPT_EOF) {
 131         switch (o) {
 132         case OPT_EOF:
 133         case OPT_ERR:
 134  opthelp:
 135             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 136             goto end;
 137         case OPT_HELP:
 138             opt_help(dsaparam_options);
 139             ret = 0;
 140             goto end;
 141         case OPT_INFORM:
 142             if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
 143                 goto opthelp;
 144             break;
 145         case OPT_IN:
 146             infile = opt_arg();
 147             break;
 148         case OPT_OUTFORM:
 149             if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))
 150                 goto opthelp;
 151             break;
 152         case OPT_OUT:
 153             outfile = opt_arg();
 154             break;
 155         case OPT_ENGINE:
 156             (void)setup_engine(opt_arg(), 0);
 157             break;
 158         case OPT_TIMEBOMB:
 159 # ifdef GENCB_TEST
 160             timebomb = atoi(opt_arg());
 161             break;
 162 # endif
 163         case OPT_TEXT:
 164             text = 1;
 165             break;
 166         case OPT_C:
 167             C = 1;
 168             break;
 169         case OPT_GENKEY:
 170             genkey = need_rand = 1;
 171             break;
 172         case OPT_RAND:
 173             inrand = opt_arg();
 174             need_rand = 1;
 175             break;
 176         case OPT_NOOUT:
 177             noout = 1;
 178             break;
 179         }
 180     }
 181     argc = opt_num_rest();
 182     argv = opt_rest();
 183
 184     if (argc == 1) {
 185         if (!opt_int(argv[0], &num) || num < 0)
 186             goto end;
 187         /* generate a key */
 188         numbits = num;
 189         need_rand = 1;
 190     }
 191     private = genkey ? 1 : 0;
 192
 193     in = bio_open_default(infile, 'r', informat);
 194     if (in == NULL)
 195         goto end;
 196     out = bio_open_owner(outfile, outformat, private);
 197     if (out == NULL)
 198         goto end;
 199
 200     if (need_rand) {
 201         app_RAND_load_file(NULL, (inrand != NULL));
 202         if (inrand != NULL)
 203             BIO_printf(bio_err, "%ld semi-random bytes loaded\n",
 204                        app_RAND_load_files(inrand));
 205     }
 206
 207     if (numbits > 0) {
 208         cb = BN_GENCB_new();
 209         if (cb == NULL) {
 210             BIO_printf(bio_err, "Error allocating BN_GENCB object\n");
 211             goto end;
 212         }
 213         BN_GENCB_set(cb, dsa_cb, bio_err);
 214         assert(need_rand);
 215         dsa = DSA_new();
 216         if (dsa == NULL) {
 217             BIO_printf(bio_err, "Error allocating DSA object\n");
 218             goto end;
 219         }
 220         BIO_printf(bio_err, "Generating DSA parameters, %d bit long prime\n",
 221                    num);
 222         BIO_printf(bio_err, "This could take some time\n");
 223 # ifdef GENCB_TEST
 224         if (timebomb > 0) {
 225             struct sigaction act;
 226             act.sa_handler = timebomb_sigalarm;
 227             act.sa_flags = 0;
 228             BIO_printf(bio_err,
 229                        "(though I'll stop it if not done within %d secs)\n",
 230                        timebomb);
 231             if (sigaction(SIGALRM, &act, NULL) != 0) {
 232                 BIO_printf(bio_err, "Error, couldn't set SIGALRM handler\n");
 233                 goto end;
 234             }
 235             alarm(timebomb);
 236         }
 237 # endif
 238         if (!DSA_generate_parameters_ex(dsa, num, NULL, 0, NULL, NULL, cb)) {
 239 # ifdef GENCB_TEST
 240             if (stop_keygen_flag) {
 241                 BIO_printf(bio_err, "DSA key generation time-stopped\n");
 242                 /* This is an asked-for behaviour! */
 243                 ret = 0;
 244                 goto end;
 245             }
 246 # endif
 247             ERR_print_errors(bio_err);
 248             BIO_printf(bio_err, "Error, DSA key generation failed\n");
 249             goto end;
 250         }
 251     } else if (informat == FORMAT_ASN1)
 252         dsa = d2i_DSAparams_bio(in, NULL);
 253     else
 254         dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL);
 255     if (dsa == NULL) {
 256         BIO_printf(bio_err, "unable to load DSA parameters\n");
 257         ERR_print_errors(bio_err);
 258         goto end;
 259     }
 260
 261     if (text) {
 262         DSAparams_print(out, dsa);
 263     }
 264
 265     if (C) {
 266         int len = BN_num_bytes(dsa->p);
 267         int bits_p = BN_num_bits(dsa->p);
 268         unsigned char *data = app_malloc(len + 20, "BN space");
 269
 270         BIO_printf(bio_out, "DSA *get_dsa%d()\n{\n", bits_p);
 271         print_bignum_var(bio_out, dsa->p, "dsap", len, data);
 272         print_bignum_var(bio_out, dsa->q, "dsaq", len, data);
 273         print_bignum_var(bio_out, dsa->g, "dsag", len, data);
 274         BIO_printf(bio_out, "    DSA *dsa = DSA_new();\n"
 275                             "\n");
 276         BIO_printf(bio_out, "    if (dsa == NULL)\n"
 277                             "        return NULL;\n");
 278         BIO_printf(bio_out, "    dsa->p = BN_bin2bn(dsap_%d, sizeof (dsap_%d), NULL);\n",
 279                bits_p, bits_p);
 280         BIO_printf(bio_out, "    dsa->q = BN_bin2bn(dsaq_%d, sizeof (dsaq_%d), NULL);\n",
 281                bits_p, bits_p);
 282         BIO_printf(bio_out, "    dsa->g = BN_bin2bn(dsag_%d, sizeof (dsag_%d), NULL);\n",
 283                bits_p, bits_p);
 284         BIO_printf(bio_out, "    if (!dsa->p || !dsa->q || !dsa->g) {\n"
 285                             "        DSA_free(dsa);\n"
 286                             "        return NULL;\n"
 287                             "    }\n"
 288                             "    return(dsa);\n}\n");
 289     }
 290
 291     if (!noout) {
 292         if (outformat == FORMAT_ASN1)
 293             i = i2d_DSAparams_bio(out, dsa);
 294         else
 295             i = PEM_write_bio_DSAparams(out, dsa);
 296         if (!i) {
 297             BIO_printf(bio_err, "unable to write DSA parameters\n");
 298             ERR_print_errors(bio_err);
 299             goto end;
 300         }
 301     }
 302     if (genkey) {
 303         DSA *dsakey;
 304
 305         assert(need_rand);
 306         if ((dsakey = DSAparams_dup(dsa)) == NULL)
 307             goto end;
 308         if (!DSA_generate_key(dsakey)) {
 309             ERR_print_errors(bio_err);
 310             DSA_free(dsakey);
 311             goto end;
 312         }
 313         assert(private);
 314         if (outformat == FORMAT_ASN1)
 315             i = i2d_DSAPrivateKey_bio(out, dsakey);
 316         else
 317             i = PEM_write_bio_DSAPrivateKey(out, dsakey, NULL, NULL, 0, NULL,
 318                                             NULL);
 319         DSA_free(dsakey);
 320     }
 321     if (need_rand)
 322         app_RAND_write_file(NULL);
 323     ret = 0;
 324  end:
 325     BN_GENCB_free(cb);
 326     BIO_free(in);
 327     BIO_free_all(out);
 328     DSA_free(dsa);
 329     return (ret);
 330 }
 331
 332 static int dsa_cb(int p, int n, BN_GENCB *cb)
 333 {
 334     char c = '*';
 335
 336     if (p == 0)
 337         c = '.';
 338     if (p == 1)
 339         c = '+';
 340     if (p == 2)
 341         c = '*';
 342     if (p == 3)
 343         c = '\n';
 344     BIO_write(BN_GENCB_get_arg(cb), &c, 1);
 345     (void)BIO_flush(BN_GENCB_get_arg(cb));
 346 # ifdef GENCB_TEST
 347     if (stop_keygen_flag)
 348         return 0;
 349 # endif
 350     return 1;
 351 }
 352 #endif