bin/openssl/dsaparam.c

   1 /* $OpenBSD: dsaparam.c,v 1.10 2018/02/07 05:47:55 jsing Exp $ */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <openssl/opensslconf.h>        /* for OPENSSL_NO_DSA */
  60
  61 /* Until the key-gen callbacks are modified to use newer prototypes, we allow
  62  * deprecated functions for openssl-internal code */
  63 #ifdef OPENSSL_NO_DEPRECATED
  64 #undef OPENSSL_NO_DEPRECATED
  65 #endif
  66
  67 #include <limits.h>
  68 #include <stdio.h>
  69 #include <stdlib.h>
  70 #include <string.h>
  71 #include <time.h>
  72
  73 #include "apps.h"
  74
  75 #include <openssl/bio.h>
  76 #include <openssl/bn.h>
  77 #include <openssl/err.h>
  78 #include <openssl/dsa.h>
  79 #include <openssl/pem.h>
  80 #include <openssl/x509.h>
  81
  82 static struct {
  83         int C;
  84         int genkey;
  85         char *infile;
  86         int informat;
  87         int noout;
  88         char *outfile;
  89         int outformat;
  90         int text;
  91 } dsaparam_config;
  92
  93 static struct option dsaparam_options[] = {
  94         {
  95                 .name = "C",
  96                 .desc = "Convert DSA parameters into C code",
  97                 .type = OPTION_FLAG,
  98                 .opt.flag = &dsaparam_config.C,
  99         },
 100         {
 101                 .name = "genkey",
 102                 .desc = "Generate a DSA key",
 103                 .type = OPTION_FLAG,
 104                 .opt.flag = &dsaparam_config.genkey,
 105         },
 106         {
 107                 .name = "in",
 108                 .argname = "file",
 109                 .desc = "Input file (default stdin)",
 110                 .type = OPTION_ARG,
 111                 .opt.arg = &dsaparam_config.infile,
 112         },
 113         {
 114                 .name = "inform",
 115                 .argname = "format",
 116                 .desc = "Input format (DER or PEM (default))",
 117                 .type = OPTION_ARG_FORMAT,
 118                 .opt.value = &dsaparam_config.informat,
 119         },
 120         {
 121                 .name = "noout",
 122                 .desc = "No output",
 123                 .type = OPTION_FLAG,
 124                 .opt.flag = &dsaparam_config.noout,
 125         },
 126         {
 127                 .name = "out",
 128                 .argname = "file",
 129                 .desc = "Output file (default stdout)",
 130                 .type = OPTION_ARG,
 131                 .opt.arg = &dsaparam_config.outfile,
 132         },
 133         {
 134                 .name = "outform",
 135                 .argname = "format",
 136                 .desc = "Output format (DER or PEM (default))",
 137                 .type = OPTION_ARG_FORMAT,
 138                 .opt.value = &dsaparam_config.outformat,
 139         },
 140         {
 141                 .name = "text",
 142                 .desc = "Print as text",
 143                 .type = OPTION_FLAG,
 144                 .opt.flag = &dsaparam_config.text,
 145         },
 146         { NULL },
 147 };
 148
 149 static void
 150 dsaparam_usage(void)
 151 {
 152         fprintf(stderr,
 153             "usage: dsaparam [-C] [-genkey] [-in file]\n"
 154             "    [-inform format] [-noout] [-out file] [-outform format]\n"
 155             "    [-text] [numbits]\n\n");
 156         options_usage(dsaparam_options);
 157 }
 158
 159 static int dsa_cb(int p, int n, BN_GENCB * cb);
 160
 161 int
 162 dsaparam_main(int argc, char **argv)
 163 {
 164         DSA *dsa = NULL;
 165         int i;
 166         BIO *in = NULL, *out = NULL;
 167         int ret = 1;
 168         int numbits = -1;
 169         char *strbits = NULL;
 170
 171         if (single_execution) {
 172                 if (pledge("stdio cpath wpath rpath", NULL) == -1) {
 173                         perror("pledge");
 174                         exit(1);
 175                 }
 176         }
 177
 178         memset(&dsaparam_config, 0, sizeof(dsaparam_config));
 179
 180         dsaparam_config.informat = FORMAT_PEM;
 181         dsaparam_config.outformat = FORMAT_PEM;
 182
 183         if (options_parse(argc, argv, dsaparam_options, &strbits, NULL) != 0) {
 184                 dsaparam_usage();
 185                 goto end;
 186         }
 187
 188         if (strbits != NULL) {
 189                 const char *errstr;
 190                 numbits = strtonum(strbits, 0, INT_MAX, &errstr);
 191                 if (errstr) {
 192                         fprintf(stderr, "Invalid number of bits: %s", errstr);
 193                         goto end;
 194                 }
 195         }
 196
 197         in = BIO_new(BIO_s_file());
 198         out = BIO_new(BIO_s_file());
 199         if (in == NULL || out == NULL) {
 200                 ERR_print_errors(bio_err);
 201                 goto end;
 202         }
 203         if (dsaparam_config.infile == NULL)
 204                 BIO_set_fp(in, stdin, BIO_NOCLOSE);
 205         else {
 206                 if (BIO_read_filename(in, dsaparam_config.infile) <= 0) {
 207                         perror(dsaparam_config.infile);
 208                         goto end;
 209                 }
 210         }
 211         if (dsaparam_config.outfile == NULL) {
 212                 BIO_set_fp(out, stdout, BIO_NOCLOSE);
 213         } else {
 214                 if (BIO_write_filename(out, dsaparam_config.outfile) <= 0) {
 215                         perror(dsaparam_config.outfile);
 216                         goto end;
 217                 }
 218         }
 219
 220         if (numbits > 0) {
 221                 BN_GENCB cb;
 222                 BN_GENCB_set(&cb, dsa_cb, bio_err);
 223                 dsa = DSA_new();
 224                 if (!dsa) {
 225                         BIO_printf(bio_err, "Error allocating DSA object\n");
 226                         goto end;
 227                 }
 228                 BIO_printf(bio_err, "Generating DSA parameters, %d bit long prime\n", numbits);
 229                 BIO_printf(bio_err, "This could take some time\n");
 230                 if (!DSA_generate_parameters_ex(dsa, numbits, NULL, 0, NULL, NULL, &cb)) {
 231                         ERR_print_errors(bio_err);
 232                         BIO_printf(bio_err, "Error, DSA key generation failed\n");
 233                         goto end;
 234                 }
 235         } else if (dsaparam_config.informat == FORMAT_ASN1)
 236                 dsa = d2i_DSAparams_bio(in, NULL);
 237         else if (dsaparam_config.informat == FORMAT_PEM)
 238                 dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL);
 239         else {
 240                 BIO_printf(bio_err, "bad input format specified\n");
 241                 goto end;
 242         }
 243         if (dsa == NULL) {
 244                 BIO_printf(bio_err, "unable to load DSA parameters\n");
 245                 ERR_print_errors(bio_err);
 246                 goto end;
 247         }
 248         if (dsaparam_config.text) {
 249                 DSAparams_print(out, dsa);
 250         }
 251         if (dsaparam_config.C) {
 252                 unsigned char *data;
 253                 int l, len, bits_p;
 254
 255                 len = BN_num_bytes(dsa->p);
 256                 bits_p = BN_num_bits(dsa->p);
 257                 data = malloc(len + 20);
 258                 if (data == NULL) {
 259                         perror("malloc");
 260                         goto end;
 261                 }
 262                 l = BN_bn2bin(dsa->p, data);
 263                 printf("static unsigned char dsa%d_p[] = {", bits_p);
 264                 for (i = 0; i < l; i++) {
 265                         if ((i % 12) == 0)
 266                                 printf("\n\t");
 267                         printf("0x%02X, ", data[i]);
 268                 }
 269                 printf("\n\t};\n");
 270
 271                 l = BN_bn2bin(dsa->q, data);
 272                 printf("static unsigned char dsa%d_q[] = {", bits_p);
 273                 for (i = 0; i < l; i++) {
 274                         if ((i % 12) == 0)
 275                                 printf("\n\t");
 276                         printf("0x%02X, ", data[i]);
 277                 }
 278                 printf("\n\t};\n");
 279
 280                 l = BN_bn2bin(dsa->g, data);
 281                 printf("static unsigned char dsa%d_g[] = {", bits_p);
 282                 for (i = 0; i < l; i++) {
 283                         if ((i % 12) == 0)
 284                                 printf("\n\t");
 285                         printf("0x%02X, ", data[i]);
 286                 }
 287                 free(data);
 288                 printf("\n\t};\n\n");
 289
 290                 printf("DSA *get_dsa%d()\n\t{\n", bits_p);
 291                 printf("\tDSA *dsa;\n\n");
 292                 printf("\tif ((dsa = DSA_new()) == NULL) return(NULL);\n");
 293                 printf("\tdsa->p = BN_bin2bn(dsa%d_p, sizeof(dsa%d_p), NULL);\n",
 294                     bits_p, bits_p);
 295                 printf("\tdsa->q = BN_bin2bn(dsa%d_q, sizeof(dsa%d_q), NULL);\n",
 296                     bits_p, bits_p);
 297                 printf("\tdsa->g = BN_bin2bn(dsa%d_g, sizeof(dsa%d_g), NULL);\n",
 298                     bits_p, bits_p);
 299                 printf("\tif ((dsa->p == NULL) || (dsa->q == NULL) || (dsa->g == NULL))\n");
 300                 printf("\t\t{ DSA_free(dsa); return(NULL); }\n");
 301                 printf("\treturn(dsa);\n\t}\n");
 302         }
 303         if (!dsaparam_config.noout) {
 304                 if (dsaparam_config.outformat == FORMAT_ASN1)
 305                         i = i2d_DSAparams_bio(out, dsa);
 306                 else if (dsaparam_config.outformat == FORMAT_PEM)
 307                         i = PEM_write_bio_DSAparams(out, dsa);
 308                 else {
 309                         BIO_printf(bio_err, "bad output format specified for outfile\n");
 310                         goto end;
 311                 }
 312                 if (!i) {
 313                         BIO_printf(bio_err, "unable to write DSA parameters\n");
 314                         ERR_print_errors(bio_err);
 315                         goto end;
 316                 }
 317         }
 318         if (dsaparam_config.genkey) {
 319                 DSA *dsakey;
 320
 321                 if ((dsakey = DSAparams_dup(dsa)) == NULL)
 322                         goto end;
 323                 if (!DSA_generate_key(dsakey)) {
 324                         ERR_print_errors(bio_err);
 325                         DSA_free(dsakey);
 326                         goto end;
 327                 }
 328                 if (dsaparam_config.outformat == FORMAT_ASN1)
 329                         i = i2d_DSAPrivateKey_bio(out, dsakey);
 330                 else if (dsaparam_config.outformat == FORMAT_PEM)
 331                         i = PEM_write_bio_DSAPrivateKey(out, dsakey, NULL, NULL, 0, NULL, NULL);
 332                 else {
 333                         BIO_printf(bio_err, "bad output format specified for outfile\n");
 334                         DSA_free(dsakey);
 335                         goto end;
 336                 }
 337                 DSA_free(dsakey);
 338         }
 339         ret = 0;
 340
 341  end:
 342         BIO_free(in);
 343         BIO_free_all(out);
 344         DSA_free(dsa);
 345
 346         return (ret);
 347 }
 348
 349 static int
 350 dsa_cb(int p, int n, BN_GENCB * cb)
 351 {
 352         char c = '*';
 353
 354         if (p == 0)
 355                 c = '.';
 356         if (p == 1)
 357                 c = '+';
 358         if (p == 2)
 359                 c = '*';
 360         if (p == 3)
 361                 c = '\n';
 362         BIO_write(cb->arg, &c, 1);
 363         (void) BIO_flush(cb->arg);
 364 #ifdef GENCB_TEST
 365         if (stop_keygen_flag)
 366                 return 0;
 367 #endif
 368         return 1;
 369 }