bin/openssl/ec.c

   1 /* $OpenBSD: ec.c,v 1.9 2017/01/20 08:57:12 deraadt Exp $ */
   2 /*
   3  * Written by Nils Larsch for the OpenSSL project.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 1998-2005 The OpenSSL Project.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgment:
  22  *    "This product includes software developed by the OpenSSL Project
  23  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  24  *
  25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26  *    endorse or promote products derived from this software without
  27  *    prior written permission. For written permission, please contact
  28  *    openssl-core@openssl.org.
  29  *
  30  * 5. Products derived from this software may not be called "OpenSSL"
  31  *    nor may "OpenSSL" appear in their names without prior written
  32  *    permission of the OpenSSL Project.
  33  *
  34  * 6. Redistributions of any form whatsoever must retain the following
  35  *    acknowledgment:
  36  *    "This product includes software developed by the OpenSSL Project
  37  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50  * OF THE POSSIBILITY OF SUCH DAMAGE.
  51  * ====================================================================
  52  *
  53  * This product includes cryptographic software written by Eric Young
  54  * (eay@cryptsoft.com).  This product includes software written by Tim
  55  * Hudson (tjh@cryptsoft.com).
  56  *
  57  */
  58
  59 #include <openssl/opensslconf.h>
  60
  61 #ifndef OPENSSL_NO_EC
  62
  63 #include <ctype.h>
  64 #include <stdio.h>
  65 #include <stdlib.h>
  66 #include <string.h>
  67
  68 #include "apps.h"
  69
  70 #include <openssl/bio.h>
  71 #include <openssl/err.h>
  72 #include <openssl/evp.h>
  73 #include <openssl/pem.h>
  74
  75 static struct {
  76         int asn1_flag;
  77         const EVP_CIPHER *enc;
  78         point_conversion_form_t form;
  79         char *infile;
  80         int informat;
  81         char *outfile;
  82         int outformat;
  83         int new_asn1_flag;
  84         int new_form;
  85         int noout;
  86         int param_out;
  87         char *passargin;
  88         char *passargout;
  89         int pubin;
  90         int pubout;
  91         int text;
  92 } ec_config;
  93
  94 static int
  95 ec_opt_enc(int argc, char **argv, int *argsused)
  96 {
  97         char *name = argv[0];
  98
  99         if (*name++ != '-')
 100                 return (1);
 101
 102         if ((ec_config.enc = EVP_get_cipherbyname(name)) != NULL) {
 103                 *argsused = 1;
 104                 return (0);
 105         }
 106
 107         return (1);
 108 }
 109
 110 static int
 111 ec_opt_form(char *arg)
 112 {
 113         if (strcmp(arg, "compressed") == 0)
 114                 ec_config.form = POINT_CONVERSION_COMPRESSED;
 115         else if (strcmp(arg, "uncompressed") == 0)
 116                 ec_config.form = POINT_CONVERSION_UNCOMPRESSED;
 117         else if (strcmp(arg, "hybrid") == 0)
 118                 ec_config.form = POINT_CONVERSION_HYBRID;
 119         else {
 120                 fprintf(stderr, "Invalid point conversion: %s\n", arg);
 121                 return (1);
 122         }
 123
 124         ec_config.new_form = 1;
 125         return (0);
 126 }
 127
 128 static int
 129 ec_opt_named(char *arg)
 130 {
 131         if (strcmp(arg, "named_curve") == 0)
 132                 ec_config.asn1_flag = OPENSSL_EC_NAMED_CURVE;
 133         else if (strcmp(arg, "explicit") == 0)
 134                 ec_config.asn1_flag = 0;
 135         else {
 136                 fprintf(stderr, "Invalid curve type: %s\n", arg);
 137                 return (1);
 138         }
 139
 140         ec_config.new_asn1_flag = 1;
 141         return (0);
 142 }
 143
 144 static struct option ec_options[] = {
 145         {
 146                 .name = "conv_form",
 147                 .argname = "form",
 148                 .desc = "Specify the point conversion form (default"
 149                     " \"named_curve\")",
 150                 .type = OPTION_ARG_FUNC,
 151                 .opt.argfunc = ec_opt_form,
 152         },
 153         {
 154                 .name = "in",
 155                 .argname = "file",
 156                 .desc = "Input file (default stdin)",
 157                 .type = OPTION_ARG,
 158                 .opt.arg = &ec_config.infile,
 159         },
 160         {
 161                 .name = "inform",
 162                 .argname = "format",
 163                 .desc = "Input format (DER or PEM (default))",
 164                 .type = OPTION_ARG_FORMAT,
 165                 .opt.value = &ec_config.informat,
 166         },
 167         {
 168                 .name = "noout",
 169                 .desc = "No output",
 170                 .type = OPTION_FLAG,
 171                 .opt.flag = &ec_config.noout,
 172         },
 173         {
 174                 .name = "out",
 175                 .argname = "file",
 176                 .desc = "Output file (default stdout)",
 177                 .type = OPTION_ARG,
 178                 .opt.arg = &ec_config.outfile,
 179         },
 180         {
 181                 .name = "outform",
 182                 .argname = "format",
 183                 .desc = "Output format (DER or PEM (default))",
 184                 .type = OPTION_ARG_FORMAT,
 185                 .opt.value = &ec_config.outformat,
 186         },
 187         {
 188                 .name = "param_enc",
 189                 .argname = "type",
 190                 .desc = "Specify the way the ec parameters are encoded"
 191                     " (default \"uncompressed\")",
 192                 .type = OPTION_ARG_FUNC,
 193                 .opt.argfunc = ec_opt_named,
 194         },
 195         {
 196                 .name = "param_out",
 197                 .desc = "Print the elliptic curve parameters",
 198                 .type = OPTION_FLAG,
 199                 .opt.flag = &ec_config.param_out,
 200         },
 201         {
 202                 .name = "passin",
 203                 .argname = "source",
 204                 .desc = "Input file passphrase source",
 205                 .type = OPTION_ARG,
 206                 .opt.arg = &ec_config.passargin,
 207         },
 208         {
 209                 .name = "passout",
 210                 .argname = "source",
 211                 .desc = "Output file passphrase source",
 212                 .type = OPTION_ARG,
 213                 .opt.arg = &ec_config.passargout,
 214         },
 215         {
 216                 .name = "pubin",
 217                 .desc = "Read public key instead of private key from input",
 218                 .type = OPTION_FLAG,
 219                 .opt.flag = &ec_config.pubin,
 220         },
 221         {
 222                 .name = "pubout",
 223                 .desc = "Output public key instead of private key in output",
 224                 .type = OPTION_FLAG,
 225                 .opt.flag = &ec_config.pubout,
 226         },
 227         {
 228                 .name = "text",
 229                 .desc = "Print the public/private key components and parameters",
 230                 .type = OPTION_FLAG,
 231                 .opt.flag = &ec_config.text,
 232         },
 233         {
 234                 .name = NULL,
 235                 .desc = "Cipher to encrypt the output if using PEM format",
 236                 .type = OPTION_ARGV_FUNC,
 237                 .opt.argvfunc = ec_opt_enc,
 238         },
 239         { NULL },
 240 };
 241
 242 static void
 243 show_ciphers(const OBJ_NAME *name, void *arg)
 244 {
 245         static int n;
 246
 247         if (!islower((unsigned char)*name->name))
 248                 return;
 249
 250         fprintf(stderr, " -%-24s%s", name->name, (++n % 3 ? "" : "\n"));
 251 }
 252
 253 static void
 254 ec_usage(void)
 255 {
 256         fprintf(stderr,
 257             "usage: ec [-conv_form form] [-in file]\n"
 258             "    [-inform format] [-noout] [-out file] [-outform format]\n"
 259             "    [-param_enc type] [-param_out] [-passin file]\n"
 260             "    [-passout file] [-pubin] [-pubout] [-text] [-ciphername]\n\n");
 261         options_usage(ec_options);
 262
 263         fprintf(stderr, "\n");
 264
 265         fprintf(stderr, "Valid ciphername values:\n\n");
 266         OBJ_NAME_do_all_sorted(OBJ_NAME_TYPE_CIPHER_METH, show_ciphers, NULL);
 267         fprintf(stderr, "\n");
 268 }
 269
 270 int
 271 ec_main(int argc, char **argv)
 272 {
 273         int ret = 1;
 274         EC_KEY *eckey = NULL;
 275         const EC_GROUP *group;
 276         int i;
 277         BIO *in = NULL, *out = NULL;
 278         char *passin = NULL, *passout = NULL;
 279
 280         if (single_execution) {
 281                 if (pledge("stdio cpath wpath rpath tty", NULL) == -1) {
 282                         perror("pledge");
 283                         exit(1);
 284                 }
 285         }
 286
 287         memset(&ec_config, 0, sizeof(ec_config));
 288
 289         ec_config.asn1_flag = OPENSSL_EC_NAMED_CURVE;
 290         ec_config.form = POINT_CONVERSION_UNCOMPRESSED;
 291         ec_config.informat = FORMAT_PEM;
 292         ec_config.outformat = FORMAT_PEM;
 293
 294         if (options_parse(argc, argv, ec_options, NULL, NULL) != 0) {
 295                 ec_usage();
 296                 goto end;
 297         }
 298
 299         if (!app_passwd(bio_err, ec_config.passargin, ec_config.passargout,
 300             &passin, &passout)) {
 301                 BIO_printf(bio_err, "Error getting passwords\n");
 302                 goto end;
 303         }
 304         in = BIO_new(BIO_s_file());
 305         out = BIO_new(BIO_s_file());
 306         if (in == NULL || out == NULL) {
 307                 ERR_print_errors(bio_err);
 308                 goto end;
 309         }
 310         if (ec_config.infile == NULL)
 311                 BIO_set_fp(in, stdin, BIO_NOCLOSE);
 312         else {
 313                 if (BIO_read_filename(in, ec_config.infile) <= 0) {
 314                         perror(ec_config.infile);
 315                         goto end;
 316                 }
 317         }
 318
 319         BIO_printf(bio_err, "read EC key\n");
 320         if (ec_config.informat == FORMAT_ASN1) {
 321                 if (ec_config.pubin)
 322                         eckey = d2i_EC_PUBKEY_bio(in, NULL);
 323                 else
 324                         eckey = d2i_ECPrivateKey_bio(in, NULL);
 325         } else if (ec_config.informat == FORMAT_PEM) {
 326                 if (ec_config.pubin)
 327                         eckey = PEM_read_bio_EC_PUBKEY(in, NULL, NULL,
 328                             NULL);
 329                 else
 330                         eckey = PEM_read_bio_ECPrivateKey(in, NULL, NULL,
 331                             passin);
 332         } else {
 333                 BIO_printf(bio_err, "bad input format specified for key\n");
 334                 goto end;
 335         }
 336         if (eckey == NULL) {
 337                 BIO_printf(bio_err, "unable to load Key\n");
 338                 ERR_print_errors(bio_err);
 339                 goto end;
 340         }
 341         if (ec_config.outfile == NULL) {
 342                 BIO_set_fp(out, stdout, BIO_NOCLOSE);
 343         } else {
 344                 if (BIO_write_filename(out, ec_config.outfile) <= 0) {
 345                         perror(ec_config.outfile);
 346                         goto end;
 347                 }
 348         }
 349
 350         group = EC_KEY_get0_group(eckey);
 351
 352         if (ec_config.new_form)
 353                 EC_KEY_set_conv_form(eckey, ec_config.form);
 354
 355         if (ec_config.new_asn1_flag)
 356                 EC_KEY_set_asn1_flag(eckey, ec_config.asn1_flag);
 357
 358         if (ec_config.text)
 359                 if (!EC_KEY_print(out, eckey, 0)) {
 360                         perror(ec_config.outfile);
 361                         ERR_print_errors(bio_err);
 362                         goto end;
 363                 }
 364         if (ec_config.noout) {
 365                 ret = 0;
 366                 goto end;
 367         }
 368         BIO_printf(bio_err, "writing EC key\n");
 369         if (ec_config.outformat == FORMAT_ASN1) {
 370                 if (ec_config.param_out)
 371                         i = i2d_ECPKParameters_bio(out, group);
 372                 else if (ec_config.pubin || ec_config.pubout)
 373                         i = i2d_EC_PUBKEY_bio(out, eckey);
 374                 else
 375                         i = i2d_ECPrivateKey_bio(out, eckey);
 376         } else if (ec_config.outformat == FORMAT_PEM) {
 377                 if (ec_config.param_out)
 378                         i = PEM_write_bio_ECPKParameters(out, group);
 379                 else if (ec_config.pubin || ec_config.pubout)
 380                         i = PEM_write_bio_EC_PUBKEY(out, eckey);
 381                 else
 382                         i = PEM_write_bio_ECPrivateKey(out, eckey,
 383                             ec_config.enc, NULL, 0, NULL, passout);
 384         } else {
 385                 BIO_printf(bio_err, "bad output format specified for "
 386                     "outfile\n");
 387                 goto end;
 388         }
 389
 390         if (!i) {
 391                 BIO_printf(bio_err, "unable to write private key\n");
 392                 ERR_print_errors(bio_err);
 393         } else
 394                 ret = 0;
 395 end:
 396         BIO_free(in);
 397         if (out)
 398                 BIO_free_all(out);
 399         if (eckey)
 400                 EC_KEY_free(eckey);
 401         free(passin);
 402         free(passout);
 403
 404         return (ret);
 405 }
 406 #endif