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 <stdio.h>
  62 # include <stdlib.h>
  63 # include <time.h>
  64 # include <string.h>
  65 # include "apps.h"
  66 # include <openssl/bio.h>
  67 # include <openssl/err.h>
  68 # include <openssl/bn.h>
  69 # include <openssl/dsa.h>
  70 # include <openssl/x509.h>
  71 # include <openssl/pem.h>
  72
  73 # ifdef GENCB_TEST
  74
  75 static int stop_keygen_flag = 0;
  76
  77 static void timebomb_sigalarm(int foo)
  78 {
  79     stop_keygen_flag = 1;
  80 }
  81
  82 # endif
  83
  84 static int dsa_cb(int p, int n, BN_GENCB *cb);
  85
  86 typedef enum OPTION_choice {
  87     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  88     OPT_INFORM, OPT_OUTFORM, OPT_IN, OPT_OUT, OPT_TEXT, OPT_C,
  89     OPT_NOOUT, OPT_GENKEY, OPT_RAND, OPT_NON_FIPS_ALLOW, OPT_ENGINE,
  90     OPT_TIMEBOMB
  91 } OPTION_CHOICE;
  92
  93 OPTIONS dsaparam_options[] = {
  94     {"help", OPT_HELP, '-', "Display this summary"},
  95     {"inform", OPT_INFORM, 'F', "Input format - DER or PEM"},
  96     {"in", OPT_IN, '<', "Input file"},
  97     {"outform", OPT_OUTFORM, 'F', "Output format - DER or PEM"},
  98     {"out", OPT_OUT, '>', "Output file"},
  99     {"text", OPT_TEXT, '-', "Print as text"},
 100     {"C", OPT_C, '-', "Output C code"},
 101     {"noout", OPT_NOOUT, '-', "No output"},
 102     {"genkey", OPT_GENKEY, '-', "Generate a DSA key"},
 103     {"rand", OPT_RAND, 's', "Files to use for random number input"},
 104     {"non-fips-allow", OPT_NON_FIPS_ALLOW, '-'},
 105 # ifdef GENCB_TEST
 106     {"timebomb", OPT_TIMEBOMB, 'p', "Interrupt keygen after 'pnum' seconds"},
 107 # endif
 108 # ifndef OPENSSL_NO_ENGINE
 109     {"engine", OPT_ENGINE, 's', "Use engine e, possibly a hardware device"},
 110 # endif
 111     {NULL}
 112 };
 113
 114 int dsaparam_main(int argc, char **argv)
 115 {
 116     DSA *dsa = NULL;
 117     BIO *in = NULL, *out = NULL;
 118     BN_GENCB *cb = NULL;
 119     int numbits = -1, num = 0, genkey = 0, need_rand = 0, non_fips_allow = 0;
 120     int informat = FORMAT_PEM, outformat = FORMAT_PEM, noout = 0, C = 0;
 121     int ret = 1, i, text = 0, private = 0;
 122 # ifdef GENCB_TEST
 123     int timebomb = 0;
 124 # endif
 125     char *infile = NULL, *outfile = NULL, *prog, *inrand = NULL;
 126     OPTION_CHOICE o;
 127
 128     prog = opt_init(argc, argv, dsaparam_options);
 129     while ((o = opt_next()) != OPT_EOF) {
 130         switch (o) {
 131         case OPT_EOF:
 132         case OPT_ERR:
 133  opthelp:
 134             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 135             goto end;
 136         case OPT_HELP:
 137             opt_help(dsaparam_options);
 138             ret = 0;
 139             goto end;
 140         case OPT_INFORM:
 141             if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
 142                 goto opthelp;
 143             break;
 144         case OPT_IN:
 145             infile = opt_arg();
 146             break;
 147         case OPT_OUTFORM:
 148             if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))
 149                 goto opthelp;
 150             break;
 151         case OPT_OUT:
 152             outfile = opt_arg();
 153             break;
 154         case OPT_ENGINE:
 155             (void)setup_engine(opt_arg(), 0);
 156             break;
 157         case OPT_TIMEBOMB:
 158 # ifdef GENCB_TEST
 159             timebomb = atoi(opt_arg());
 160             break;
 161 # endif
 162         case OPT_TEXT:
 163             text = 1;
 164             break;
 165         case OPT_C:
 166             C = 1;
 167             break;
 168         case OPT_GENKEY:
 169             genkey = need_rand = 1;
 170             break;
 171         case OPT_RAND:
 172             inrand = opt_arg();
 173             need_rand = 1;
 174             break;
 175         case OPT_NOOUT:
 176             noout = 1;
 177             break;
 178         case OPT_NON_FIPS_ALLOW:
 179             non_fips_allow = 1;
 180             break;
 181         }
 182     }
 183     argc = opt_num_rest();
 184     argv = opt_rest();
 185
 186     if (!app_load_modules(NULL))
 187         goto end;
 188
 189     if (argc == 1) {
 190         if (!opt_int(argv[0], &num))
 191             goto end;
 192         /* generate a key */
 193         numbits = num;
 194         need_rand = 1;
 195     }
 196     private = genkey ? 1 : 0;
 197
 198     in = bio_open_default(infile, 'r', informat);
 199     if (in == NULL)
 200         goto end;
 201     out = bio_open_owner(outfile, outformat, private);
 202     if (out == NULL)
 203         goto end;
 204
 205     if (need_rand) {
 206         app_RAND_load_file(NULL, (inrand != NULL));
 207         if (inrand != NULL)
 208             BIO_printf(bio_err, "%ld semi-random bytes loaded\n",
 209                        app_RAND_load_files(inrand));
 210     }
 211
 212     if (numbits > 0) {
 213         cb = BN_GENCB_new();
 214         if (!cb) {
 215             BIO_printf(bio_err, "Error allocating BN_GENCB object\n");
 216             goto end;
 217         }
 218         BN_GENCB_set(cb, dsa_cb, bio_err);
 219         assert(need_rand);
 220         dsa = DSA_new();
 221         if (!dsa) {
 222             BIO_printf(bio_err, "Error allocating DSA object\n");
 223             goto end;
 224         }
 225         if (non_fips_allow)
 226             dsa->flags |= DSA_FLAG_NON_FIPS_ALLOW;
 227         BIO_printf(bio_err, "Generating DSA parameters, %d bit long prime\n",
 228                    num);
 229         BIO_printf(bio_err, "This could take some time\n");
 230 # ifdef GENCB_TEST
 231         if (timebomb > 0) {
 232             struct sigaction act;
 233             act.sa_handler = timebomb_sigalarm;
 234             act.sa_flags = 0;
 235             BIO_printf(bio_err,
 236                        "(though I'll stop it if not done within %d secs)\n",
 237                        timebomb);
 238             if (sigaction(SIGALRM, &act, NULL) != 0) {
 239                 BIO_printf(bio_err, "Error, couldn't set SIGALRM handler\n");
 240                 goto end;
 241             }
 242             alarm(timebomb);
 243         }
 244 # endif
 245         if (!DSA_generate_parameters_ex(dsa, num, NULL, 0, NULL, NULL, cb)) {
 246 # ifdef GENCB_TEST
 247             if (stop_keygen_flag) {
 248                 BIO_printf(bio_err, "DSA key generation time-stopped\n");
 249                 /* This is an asked-for behaviour! */
 250                 ret = 0;
 251                 goto end;
 252             }
 253 # endif
 254             ERR_print_errors(bio_err);
 255             BIO_printf(bio_err, "Error, DSA key generation failed\n");
 256             goto end;
 257         }
 258     } else if (informat == FORMAT_ASN1)
 259         dsa = d2i_DSAparams_bio(in, NULL);
 260     else
 261         dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL);
 262     if (dsa == NULL) {
 263         BIO_printf(bio_err, "unable to load DSA parameters\n");
 264         ERR_print_errors(bio_err);
 265         goto end;
 266     }
 267
 268     if (text) {
 269         DSAparams_print(out, dsa);
 270     }
 271
 272     if (C) {
 273         int len = BN_num_bytes(dsa->p);
 274         int bits_p = BN_num_bits(dsa->p);
 275         unsigned char *data = app_malloc(len + 20, "BN space");
 276
 277         BIO_printf(bio_out, "DSA *get_dsa%d()\n{\n", bits_p);
 278         print_bignum_var(bio_out, dsa->p, "dsap", len, data);
 279         print_bignum_var(bio_out, dsa->q, "dsaq", len, data);
 280         print_bignum_var(bio_out, dsa->g, "dsag", len, data);
 281         BIO_printf(bio_out, "    DSA *dsa = DSA_new();\n"
 282                             "\n");
 283         BIO_printf(bio_out, "    if (dsa == NULL)\n"
 284                             "        return NULL;\n");
 285         BIO_printf(bio_out, "    dsa->p = BN_bin2bn(dsap_%d, sizeof (dsap_%d), NULL);\n",
 286                bits_p, bits_p);
 287         BIO_printf(bio_out, "    dsa->q = BN_bin2bn(dsaq_%d, sizeof (dsaq_%d), NULL);\n",
 288                bits_p, bits_p);
 289         BIO_printf(bio_out, "    dsa->g = BN_bin2bn(dsag_%d, sizeof (dsag_%d), NULL);\n",
 290                bits_p, bits_p);
 291         BIO_printf(bio_out, "    if (!dsa->p || !dsa->q || !dsa->g) {\n"
 292                             "        DSA_free(dsa);\n"
 293                             "        return NULL;\n"
 294                             "    }\n"
 295                             "    return(dsa);\n}\n");
 296     }
 297
 298     if (!noout) {
 299         if (outformat == FORMAT_ASN1)
 300             i = i2d_DSAparams_bio(out, dsa);
 301         else
 302             i = PEM_write_bio_DSAparams(out, dsa);
 303         if (!i) {
 304             BIO_printf(bio_err, "unable to write DSA parameters\n");
 305             ERR_print_errors(bio_err);
 306             goto end;
 307         }
 308     }
 309     if (genkey) {
 310         DSA *dsakey;
 311
 312         assert(need_rand);
 313         if ((dsakey = DSAparams_dup(dsa)) == NULL)
 314             goto end;
 315         if (non_fips_allow)
 316             dsakey->flags |= DSA_FLAG_NON_FIPS_ALLOW;
 317         if (!DSA_generate_key(dsakey)) {
 318             ERR_print_errors(bio_err);
 319             DSA_free(dsakey);
 320             goto end;
 321         }
 322         assert(private);
 323         if (outformat == FORMAT_ASN1)
 324             i = i2d_DSAPrivateKey_bio(out, dsakey);
 325         else
 326             i = PEM_write_bio_DSAPrivateKey(out, dsakey, NULL, NULL, 0, NULL,
 327                                             NULL);
 328         DSA_free(dsakey);
 329     }
 330     if (need_rand)
 331         app_RAND_write_file(NULL);
 332     ret = 0;
 333  end:
 334     BN_GENCB_free(cb);
 335     BIO_free(in);
 336     BIO_free_all(out);
 337     DSA_free(dsa);
 338     return (ret);
 339 }
 340
 341 static int dsa_cb(int p, int n, BN_GENCB *cb)
 342 {
 343     char c = '*';
 344
 345     if (p == 0)
 346         c = '.';
 347     if (p == 1)
 348         c = '+';
 349     if (p == 2)
 350         c = '*';
 351     if (p == 3)
 352         c = '\n';
 353     BIO_write(BN_GENCB_get_arg(cb), &c, 1);
 354     (void)BIO_flush(BN_GENCB_get_arg(cb));
 355 # ifdef GENCB_TEST
 356     if (stop_keygen_flag)
 357         return 0;
 358 # endif
 359     return 1;
 360 }
 361 #else                           /* !OPENSSL_NO_DSA */
 362
 363 # if PEDANTIC
 364 static void *dummy = &dummy;
 365 # endif
 366
 367 #endif