bin/openssl/dsa.c

   1 /* $OpenBSD: dsa.c,v 1.11 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 #include <ctype.h>
  62 #include <stdio.h>
  63 #include <stdlib.h>
  64 #include <time.h>
  65 #include <string.h>
  66
  67 #include "apps.h"
  68
  69 #include <openssl/bio.h>
  70 #include <openssl/bn.h>
  71 #include <openssl/dsa.h>
  72 #include <openssl/err.h>
  73 #include <openssl/evp.h>
  74 #include <openssl/pem.h>
  75 #include <openssl/x509.h>
  76
  77 static struct {
  78         const EVP_CIPHER *enc;
  79         char *infile;
  80         int informat;
  81         int modulus;
  82         int noout;
  83         char *outfile;
  84         int outformat;
  85         char *passargin;
  86         char *passargout;
  87         int pubin;
  88         int pubout;
  89         int pvk_encr;
  90         int text;
  91 } dsa_config;
  92
  93 static int
  94 dsa_opt_enc(int argc, char **argv, int *argsused)
  95 {
  96         char *name = argv[0];
  97
  98         if (*name++ != '-')
  99                 return (1);
 100
 101         if ((dsa_config.enc = EVP_get_cipherbyname(name)) != NULL) {
 102                 *argsused = 1;
 103                 return (0);
 104         }
 105
 106         return (1);
 107 }
 108
 109 static struct option dsa_options[] = {
 110         {
 111                 .name = "in",
 112                 .argname = "file",
 113                 .desc = "Input file (default stdin)",
 114                 .type = OPTION_ARG,
 115                 .opt.arg = &dsa_config.infile,
 116         },
 117         {
 118                 .name = "inform",
 119                 .argname = "format",
 120                 .desc = "Input format (PEM (default) or any other supported"
 121                     " format)",
 122                 .type = OPTION_ARG_FORMAT,
 123                 .opt.value = &dsa_config.informat,
 124         },
 125         {
 126                 .name = "noout",
 127                 .desc = "No output",
 128                 .type = OPTION_FLAG,
 129                 .opt.flag = &dsa_config.noout,
 130         },
 131         {
 132                 .name = "out",
 133                 .argname = "file",
 134                 .desc = "Output file (default stdout)",
 135                 .type = OPTION_ARG,
 136                 .opt.arg = &dsa_config.outfile,
 137         },
 138         {
 139                 .name = "outform",
 140                 .argname = "format",
 141                 .desc = "Output format (DER, MSBLOB, PEM (default) or PVK)",
 142                 .type = OPTION_ARG_FORMAT,
 143                 .opt.value = &dsa_config.outformat,
 144         },
 145         {
 146                 .name = "passin",
 147                 .argname = "source",
 148                 .desc = "Input file passphrase source",
 149                 .type = OPTION_ARG,
 150                 .opt.arg = &dsa_config.passargin,
 151         },
 152         {
 153                 .name = "passout",
 154                 .argname = "source",
 155                 .desc = "Output file passphrase source",
 156                 .type = OPTION_ARG,
 157                 .opt.arg = &dsa_config.passargout,
 158         },
 159         {
 160                 .name = "pubin",
 161                 .desc = "Read a public key from the input file instead of"
 162                     " private key",
 163                 .type = OPTION_FLAG,
 164                 .opt.flag = &dsa_config.pubin,
 165         },
 166         {
 167                 .name = "pubout",
 168                 .desc = "Output a public key instead of private key",
 169                 .type = OPTION_FLAG,
 170                 .opt.flag = &dsa_config.pubout,
 171         },
 172         {
 173                 .name = "pvk-none",
 174                 .desc = "PVK encryption level",
 175                 .type = OPTION_VALUE,
 176                 .value = 0,
 177                 .opt.value = &dsa_config.pvk_encr,
 178         },
 179         {
 180                 .name = "pvk-strong",
 181                 .desc = "PVK encryption level (default)",
 182                 .type = OPTION_VALUE,
 183                 .value = 2,
 184                 .opt.value = &dsa_config.pvk_encr,
 185         },
 186         {
 187                 .name = "pvk-weak",
 188                 .desc = "PVK encryption level",
 189                 .type = OPTION_VALUE,
 190                 .value = 1,
 191                 .opt.value = &dsa_config.pvk_encr,
 192         },
 193         {
 194                 .name = "text",
 195                 .desc = "Print the key in text form",
 196                 .type = OPTION_FLAG,
 197                 .opt.flag = &dsa_config.text,
 198         },
 199         {
 200                 .name = NULL,
 201                 .type = OPTION_ARGV_FUNC,
 202                 .opt.argvfunc = dsa_opt_enc,
 203         },
 204         { NULL },
 205 };
 206
 207 static void
 208 show_ciphers(const OBJ_NAME *name, void *arg)
 209 {
 210         static int n;
 211
 212         if (!islower((unsigned char)*name->name))
 213                 return;
 214
 215         fprintf(stderr, " -%-24s%s", name->name, (++n % 3 ? "" : "\n"));
 216 }
 217
 218 static void
 219 dsa_usage(void)
 220 {
 221         fprintf(stderr,
 222             "usage: dsa [-in file] [-inform format] [-noout]\n"
 223             "    [-out file] [-outform format] [-passin src] [-passout src]\n"
 224             "    [-pubin] [-pubout] [-pvk-none | -pvk-strong | -pvk-weak]\n"
 225             "    [-text] [-ciphername]\n\n");
 226         options_usage(dsa_options);
 227         fprintf(stderr, "\n");
 228
 229         fprintf(stderr, "Valid ciphername values:\n\n");
 230         OBJ_NAME_do_all_sorted(OBJ_NAME_TYPE_CIPHER_METH, show_ciphers, NULL);
 231         fprintf(stderr, "\n");
 232 }
 233
 234 int
 235 dsa_main(int argc, char **argv)
 236 {
 237         int ret = 1;
 238         DSA *dsa = NULL;
 239         int i;
 240         BIO *in = NULL, *out = NULL;
 241         char *passin = NULL, *passout = NULL;
 242
 243         if (single_execution) {
 244                 if (pledge("stdio cpath wpath rpath tty", NULL) == -1) {
 245                         perror("pledge");
 246                         exit(1);
 247                 }
 248         }
 249
 250         memset(&dsa_config, 0, sizeof(dsa_config));
 251
 252         dsa_config.pvk_encr = 2;
 253         dsa_config.informat = FORMAT_PEM;
 254         dsa_config.outformat = FORMAT_PEM;
 255
 256         if (options_parse(argc, argv, dsa_options, NULL, NULL) != 0) {
 257                 dsa_usage();
 258                 goto end;
 259         }
 260
 261         if (!app_passwd(bio_err, dsa_config.passargin, dsa_config.passargout,
 262             &passin, &passout)) {
 263                 BIO_printf(bio_err, "Error getting passwords\n");
 264                 goto end;
 265         }
 266
 267         in = BIO_new(BIO_s_file());
 268         out = BIO_new(BIO_s_file());
 269         if (in == NULL || out == NULL) {
 270                 ERR_print_errors(bio_err);
 271                 goto end;
 272         }
 273         if (dsa_config.infile == NULL)
 274                 BIO_set_fp(in, stdin, BIO_NOCLOSE);
 275         else {
 276                 if (BIO_read_filename(in, dsa_config.infile) <= 0) {
 277                         perror(dsa_config.infile);
 278                         goto end;
 279                 }
 280         }
 281
 282         BIO_printf(bio_err, "read DSA key\n");
 283
 284         {
 285                 EVP_PKEY *pkey;
 286
 287                 if (dsa_config.pubin)
 288                         pkey = load_pubkey(bio_err, dsa_config.infile,
 289                             dsa_config.informat, 1, passin, "Public Key");
 290                 else
 291                         pkey = load_key(bio_err, dsa_config.infile,
 292                             dsa_config.informat, 1, passin, "Private Key");
 293
 294                 if (pkey) {
 295                         dsa = EVP_PKEY_get1_DSA(pkey);
 296                         EVP_PKEY_free(pkey);
 297                 }
 298         }
 299         if (dsa == NULL) {
 300                 BIO_printf(bio_err, "unable to load Key\n");
 301                 ERR_print_errors(bio_err);
 302                 goto end;
 303         }
 304         if (dsa_config.outfile == NULL) {
 305                 BIO_set_fp(out, stdout, BIO_NOCLOSE);
 306         } else {
 307                 if (BIO_write_filename(out, dsa_config.outfile) <= 0) {
 308                         perror(dsa_config.outfile);
 309                         goto end;
 310                 }
 311         }
 312
 313         if (dsa_config.text) {
 314                 if (!DSA_print(out, dsa, 0)) {
 315                         perror(dsa_config.outfile);
 316                         ERR_print_errors(bio_err);
 317                         goto end;
 318                 }
 319         }
 320         if (dsa_config.modulus) {
 321                 fprintf(stdout, "Public Key=");
 322                 BN_print(out, dsa->pub_key);
 323                 fprintf(stdout, "\n");
 324         }
 325         if (dsa_config.noout)
 326                 goto end;
 327         BIO_printf(bio_err, "writing DSA key\n");
 328         if (dsa_config.outformat == FORMAT_ASN1) {
 329                 if (dsa_config.pubin || dsa_config.pubout)
 330                         i = i2d_DSA_PUBKEY_bio(out, dsa);
 331                 else
 332                         i = i2d_DSAPrivateKey_bio(out, dsa);
 333         } else if (dsa_config.outformat == FORMAT_PEM) {
 334                 if (dsa_config.pubin || dsa_config.pubout)
 335                         i = PEM_write_bio_DSA_PUBKEY(out, dsa);
 336                 else
 337                         i = PEM_write_bio_DSAPrivateKey(out, dsa, dsa_config.enc,
 338                             NULL, 0, NULL, passout);
 339 #if !defined(OPENSSL_NO_RSA) && !defined(OPENSSL_NO_RC4)
 340         } else if (dsa_config.outformat == FORMAT_MSBLOB ||
 341             dsa_config.outformat == FORMAT_PVK) {
 342                 EVP_PKEY *pk;
 343                 pk = EVP_PKEY_new();
 344                 EVP_PKEY_set1_DSA(pk, dsa);
 345                 if (dsa_config.outformat == FORMAT_PVK)
 346                         i = i2b_PVK_bio(out, pk, dsa_config.pvk_encr, 0,
 347                             passout);
 348                 else if (dsa_config.pubin || dsa_config.pubout)
 349                         i = i2b_PublicKey_bio(out, pk);
 350                 else
 351                         i = i2b_PrivateKey_bio(out, pk);
 352                 EVP_PKEY_free(pk);
 353 #endif
 354         } else {
 355                 BIO_printf(bio_err, "bad output format specified for outfile\n");
 356                 goto end;
 357         }
 358         if (i <= 0) {
 359                 BIO_printf(bio_err, "unable to write private key\n");
 360                 ERR_print_errors(bio_err);
 361         } else
 362                 ret = 0;
 363  end:
 364         BIO_free(in);
 365         BIO_free_all(out);
 366         DSA_free(dsa);
 367         free(passin);
 368         free(passout);
 369
 370         return (ret);
 371 }