bin/openssl/ecparam.c

   1 /* $OpenBSD: ecparam.c,v 1.17 2018/02/07 05:47:55 jsing 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  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
  60  *
  61  * Portions of the attached software ("Contribution") are developed by
  62  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
  63  *
  64  * The Contribution is licensed pursuant to the OpenSSL open source
  65  * license provided above.
  66  *
  67  * The elliptic curve binary polynomial software is originally written by
  68  * Sheueling Chang Shantz and Douglas Stebila of Sun Microsystems Laboratories.
  69  *
  70  */
  71
  72 #include <openssl/opensslconf.h>
  73
  74 #ifndef OPENSSL_NO_EC
  75
  76 #include <stdio.h>
  77 #include <stdlib.h>
  78 #include <string.h>
  79 #include <time.h>
  80
  81 #include "apps.h"
  82
  83 #include <openssl/bio.h>
  84 #include <openssl/bn.h>
  85 #include <openssl/ec.h>
  86 #include <openssl/err.h>
  87 #include <openssl/pem.h>
  88 #include <openssl/x509.h>
  89
  90 static int ecparam_print_var(BIO *, BIGNUM *, const char *, int,
  91     unsigned char *);
  92
  93 static struct {
  94         int C;
  95         int asn1_flag;
  96         int check;
  97         char *curve_name;
  98         point_conversion_form_t form;
  99         int genkey;
 100         char *infile;
 101         int informat;
 102         int list_curves;
 103         int new_asn1_flag;
 104         int new_form;
 105         int no_seed;
 106         int noout;
 107         char *outfile;
 108         int outformat;
 109         int text;
 110 } ecparam_config;
 111
 112 static int
 113 ecparam_opt_form(char *arg)
 114 {
 115         if (strcmp(arg, "compressed") == 0)
 116                 ecparam_config.form = POINT_CONVERSION_COMPRESSED;
 117         else if (strcmp(arg, "uncompressed") == 0)
 118                 ecparam_config.form = POINT_CONVERSION_UNCOMPRESSED;
 119         else if (strcmp(arg, "hybrid") == 0)
 120                 ecparam_config.form = POINT_CONVERSION_HYBRID;
 121         else
 122                 return (1);
 123
 124         ecparam_config.new_form = 1;
 125         return (0);
 126 }
 127
 128 static int
 129 ecparam_opt_enctype(char *arg)
 130 {
 131         if (strcmp(arg, "explicit") == 0)
 132                 ecparam_config.asn1_flag = 0;
 133         else if (strcmp(arg, "named_curve") == 0)
 134                 ecparam_config.asn1_flag = OPENSSL_EC_NAMED_CURVE;
 135         else
 136                 return (1);
 137
 138         ecparam_config.new_asn1_flag = 1;
 139         return (0);
 140 }
 141
 142 struct option ecparam_options[] = {
 143         {
 144                 .name = "C",
 145                 .desc = "Convert the EC parameters into C code",
 146                 .type = OPTION_FLAG,
 147                 .opt.flag = &ecparam_config.C,
 148         },
 149         {
 150                 .name = "check",
 151                 .desc = "Validate the elliptic curve parameters",
 152                 .type = OPTION_FLAG,
 153                 .opt.flag = &ecparam_config.check,
 154         },
 155         {
 156                 .name = "conv_form",
 157                 .argname = "form",
 158                 .desc = "Specify point conversion form:\n"
 159                     "  compressed, uncompressed (default), hybrid",
 160                 .type = OPTION_ARG_FUNC,
 161                 .opt.argfunc = ecparam_opt_form,
 162         },
 163         {
 164                 .name = "genkey",
 165                 .desc = "Generate an EC private key using the specified "
 166                     "parameters",
 167                 .type = OPTION_FLAG,
 168                 .opt.flag = &ecparam_config.genkey,
 169         },
 170         {
 171                 .name = "in",
 172                 .argname = "file",
 173                 .desc = "Input file to read parameters from (default stdin)",
 174                 .type = OPTION_ARG,
 175                 .opt.arg = &ecparam_config.infile,
 176         },
 177         {
 178                 .name = "inform",
 179                 .argname = "format",
 180                 .desc = "Input format (DER or PEM)",
 181                 .type = OPTION_ARG_FORMAT,
 182                 .opt.value = &ecparam_config.informat,
 183         },
 184         {
 185                 .name = "list_curves",
 186                 .desc = "Print list of all currently implemented EC "
 187                     "parameter names",
 188                 .type = OPTION_FLAG,
 189                 .opt.flag = &ecparam_config.list_curves,
 190         },
 191         {
 192                 .name = "name",
 193                 .argname = "curve",
 194                 .desc = "Use the EC parameters with the specified name",
 195                 .type = OPTION_ARG,
 196                 .opt.arg = &ecparam_config.curve_name,
 197         },
 198         {
 199                 .name = "no_seed",
 200                 .desc = "Do not output seed with explicit parameter encoding",
 201                 .type = OPTION_FLAG,
 202                 .opt.flag = &ecparam_config.no_seed,
 203         },
 204         {
 205                 .name = "noout",
 206                 .desc = "Do not output encoded version of EC parameters",
 207                 .type = OPTION_FLAG,
 208                 .opt.flag = &ecparam_config.noout,
 209         },
 210         {
 211                 .name = "out",
 212                 .argname = "file",
 213                 .desc = "Output file to write parameters to (default stdout)",
 214                 .type = OPTION_ARG,
 215                 .opt.arg = &ecparam_config.outfile,
 216         },
 217         {
 218                 .name = "outform",
 219                 .argname = "format",
 220                 .desc = "Output format (DER or PEM)",
 221                 .type = OPTION_ARG_FORMAT,
 222                 .opt.value = &ecparam_config.outformat,
 223         },
 224         {
 225                 .name = "param_enc",
 226                 .argname = "type",
 227                 .desc = "Specify EC parameter ASN.1 encoding type:\n"
 228                     "  explicit, named_curve (default)",
 229                 .type = OPTION_ARG_FUNC,
 230                 .opt.argfunc = ecparam_opt_enctype,
 231         },
 232         {
 233                 .name = "text",
 234                 .desc = "Print out the EC parameters in human readable form",
 235                 .type = OPTION_FLAG,
 236                 .opt.flag = &ecparam_config.text,
 237         },
 238         {NULL},
 239 };
 240
 241 static void
 242 ecparam_usage(void)
 243 {
 244         fprintf(stderr, "usage: ecparam [-C] [-check] [-conv_form arg] "
 245             " [-genkey]\n"
 246             "    [-in file] [-inform DER | PEM] [-list_curves] [-name arg]\n"
 247             "    [-no_seed] [-noout] [-out file] [-outform DER | PEM]\n"
 248             "    [-param_enc arg] [-text]\n\n");
 249         options_usage(ecparam_options);
 250 }
 251
 252 int
 253 ecparam_main(int argc, char **argv)
 254 {
 255         BIGNUM *ec_p = NULL, *ec_a = NULL, *ec_b = NULL, *ec_gen = NULL;
 256         BIGNUM *ec_order = NULL, *ec_cofactor = NULL;
 257         EC_GROUP *group = NULL;
 258         unsigned char *buffer = NULL;
 259         BIO *in = NULL, *out = NULL;
 260         int i, ret = 1;
 261
 262         if (single_execution) {
 263                 if (pledge("stdio cpath wpath rpath", NULL) == -1) {
 264                         perror("pledge");
 265                         exit(1);
 266                 }
 267         }
 268
 269         memset(&ecparam_config, 0, sizeof(ecparam_config));
 270         ecparam_config.asn1_flag = OPENSSL_EC_NAMED_CURVE;
 271         ecparam_config.form = POINT_CONVERSION_UNCOMPRESSED;
 272         ecparam_config.informat = FORMAT_PEM;
 273         ecparam_config.outformat = FORMAT_PEM;
 274
 275         if (options_parse(argc, argv, ecparam_options, NULL, NULL) != 0) {
 276                 ecparam_usage();
 277                 goto end;
 278         }
 279
 280         in = BIO_new(BIO_s_file());
 281         out = BIO_new(BIO_s_file());
 282         if ((in == NULL) || (out == NULL)) {
 283                 ERR_print_errors(bio_err);
 284                 goto end;
 285         }
 286         if (ecparam_config.infile == NULL)
 287                 BIO_set_fp(in, stdin, BIO_NOCLOSE);
 288         else {
 289                 if (BIO_read_filename(in, ecparam_config.infile) <= 0) {
 290                         perror(ecparam_config.infile);
 291                         goto end;
 292                 }
 293         }
 294         if (ecparam_config.outfile == NULL) {
 295                 BIO_set_fp(out, stdout, BIO_NOCLOSE);
 296         } else {
 297                 if (BIO_write_filename(out, ecparam_config.outfile) <= 0) {
 298                         perror(ecparam_config.outfile);
 299                         goto end;
 300                 }
 301         }
 302
 303         if (ecparam_config.list_curves) {
 304                 EC_builtin_curve *curves = NULL;
 305                 size_t crv_len = 0;
 306                 size_t n = 0;
 307
 308                 crv_len = EC_get_builtin_curves(NULL, 0);
 309
 310                 curves = reallocarray(NULL, crv_len, sizeof(EC_builtin_curve));
 311                 if (curves == NULL)
 312                         goto end;
 313
 314                 if (!EC_get_builtin_curves(curves, crv_len)) {
 315                         free(curves);
 316                         goto end;
 317                 }
 318                 for (n = 0; n < crv_len; n++) {
 319                         const char *comment;
 320                         const char *sname;
 321                         comment = curves[n].comment;
 322                         sname = OBJ_nid2sn(curves[n].nid);
 323                         if (comment == NULL)
 324                                 comment = "CURVE DESCRIPTION NOT AVAILABLE";
 325                         if (sname == NULL)
 326                                 sname = "";
 327
 328                         BIO_printf(out, "  %-10s: ", sname);
 329                         BIO_printf(out, "%s\n", comment);
 330                 }
 331
 332                 free(curves);
 333                 ret = 0;
 334                 goto end;
 335         }
 336         if (ecparam_config.curve_name != NULL) {
 337                 int nid;
 338
 339                 /*
 340                  * workaround for the SECG curve names secp192r1 and
 341                  * secp256r1 (which are the same as the curves prime192v1 and
 342                  * prime256v1 defined in X9.62)
 343                  */
 344                 if (!strcmp(ecparam_config.curve_name, "secp192r1")) {
 345                         BIO_printf(bio_err, "using curve name prime192v1 "
 346                             "instead of secp192r1\n");
 347                         nid = NID_X9_62_prime192v1;
 348                 } else if (!strcmp(ecparam_config.curve_name, "secp256r1")) {
 349                         BIO_printf(bio_err, "using curve name prime256v1 "
 350                             "instead of secp256r1\n");
 351                         nid = NID_X9_62_prime256v1;
 352                 } else
 353                         nid = OBJ_sn2nid(ecparam_config.curve_name);
 354
 355                 if (nid == 0)
 356                         nid = EC_curve_nist2nid(ecparam_config.curve_name);
 357
 358                 if (nid == 0) {
 359                         BIO_printf(bio_err, "unknown curve name (%s)\n",
 360                             ecparam_config.curve_name);
 361                         goto end;
 362                 }
 363                 group = EC_GROUP_new_by_curve_name(nid);
 364                 if (group == NULL) {
 365                         BIO_printf(bio_err, "unable to create curve (%s)\n",
 366                             ecparam_config.curve_name);
 367                         goto end;
 368                 }
 369                 EC_GROUP_set_asn1_flag(group, ecparam_config.asn1_flag);
 370                 EC_GROUP_set_point_conversion_form(group, ecparam_config.form);
 371         } else if (ecparam_config.informat == FORMAT_ASN1) {
 372                 group = d2i_ECPKParameters_bio(in, NULL);
 373         } else if (ecparam_config.informat == FORMAT_PEM) {
 374                 group = PEM_read_bio_ECPKParameters(in, NULL, NULL, NULL);
 375         } else {
 376                 BIO_printf(bio_err, "bad input format specified\n");
 377                 goto end;
 378         }
 379
 380         if (group == NULL) {
 381                 BIO_printf(bio_err,
 382                     "unable to load elliptic curve parameters\n");
 383                 ERR_print_errors(bio_err);
 384                 goto end;
 385         }
 386         if (ecparam_config.new_form)
 387                 EC_GROUP_set_point_conversion_form(group, ecparam_config.form);
 388
 389         if (ecparam_config.new_asn1_flag)
 390                 EC_GROUP_set_asn1_flag(group, ecparam_config.asn1_flag);
 391
 392         if (ecparam_config.no_seed)
 393                 EC_GROUP_set_seed(group, NULL, 0);
 394
 395         if (ecparam_config.text) {
 396                 if (!ECPKParameters_print(out, group, 0))
 397                         goto end;
 398         }
 399         if (ecparam_config.check) {
 400                 BIO_printf(bio_err, "checking elliptic curve parameters: ");
 401                 if (!EC_GROUP_check(group, NULL)) {
 402                         BIO_printf(bio_err, "failed\n");
 403                         ERR_print_errors(bio_err);
 404                 } else
 405                         BIO_printf(bio_err, "ok\n");
 406
 407         }
 408         if (ecparam_config.C) {
 409                 size_t buf_len = 0, tmp_len = 0;
 410                 const EC_POINT *point;
 411                 int is_prime, len = 0;
 412                 const EC_METHOD *meth = EC_GROUP_method_of(group);
 413
 414                 if ((ec_p = BN_new()) == NULL || (ec_a = BN_new()) == NULL ||
 415                     (ec_b = BN_new()) == NULL || (ec_gen = BN_new()) == NULL ||
 416                     (ec_order = BN_new()) == NULL ||
 417                     (ec_cofactor = BN_new()) == NULL) {
 418                         perror("malloc");
 419                         goto end;
 420                 }
 421                 is_prime = (EC_METHOD_get_field_type(meth) ==
 422                     NID_X9_62_prime_field);
 423
 424                 if (is_prime) {
 425                         if (!EC_GROUP_get_curve_GFp(group, ec_p, ec_a,
 426                             ec_b, NULL))
 427                                 goto end;
 428                 } else {
 429                         if (!EC_GROUP_get_curve_GF2m(group, ec_p, ec_a,
 430                             ec_b, NULL))
 431                                 goto end;
 432                 }
 433
 434                 if ((point = EC_GROUP_get0_generator(group)) == NULL)
 435                         goto end;
 436                 if (!EC_POINT_point2bn(group, point,
 437                         EC_GROUP_get_point_conversion_form(group), ec_gen,
 438                         NULL))
 439                         goto end;
 440                 if (!EC_GROUP_get_order(group, ec_order, NULL))
 441                         goto end;
 442                 if (!EC_GROUP_get_cofactor(group, ec_cofactor, NULL))
 443                         goto end;
 444
 445                 len = BN_num_bits(ec_order);
 446
 447                 if ((tmp_len = (size_t) BN_num_bytes(ec_p)) > buf_len)
 448                         buf_len = tmp_len;
 449                 if ((tmp_len = (size_t) BN_num_bytes(ec_a)) > buf_len)
 450                         buf_len = tmp_len;
 451                 if ((tmp_len = (size_t) BN_num_bytes(ec_b)) > buf_len)
 452                         buf_len = tmp_len;
 453                 if ((tmp_len = (size_t) BN_num_bytes(ec_gen)) > buf_len)
 454                         buf_len = tmp_len;
 455                 if ((tmp_len = (size_t) BN_num_bytes(ec_order)) > buf_len)
 456                         buf_len = tmp_len;
 457                 if ((tmp_len = (size_t) BN_num_bytes(ec_cofactor)) > buf_len)
 458                         buf_len = tmp_len;
 459
 460                 buffer = malloc(buf_len);
 461
 462                 if (buffer == NULL) {
 463                         perror("malloc");
 464                         goto end;
 465                 }
 466                 ecparam_print_var(out, ec_p, "ec_p", len, buffer);
 467                 ecparam_print_var(out, ec_a, "ec_a", len, buffer);
 468                 ecparam_print_var(out, ec_b, "ec_b", len, buffer);
 469                 ecparam_print_var(out, ec_gen, "ec_gen", len, buffer);
 470                 ecparam_print_var(out, ec_order, "ec_order", len, buffer);
 471                 ecparam_print_var(out, ec_cofactor, "ec_cofactor", len,
 472                     buffer);
 473
 474                 BIO_printf(out, "\n\n");
 475
 476                 BIO_printf(out, "EC_GROUP *get_ec_group_%d(void)\n\t{\n", len);
 477                 BIO_printf(out, "\tint ok=0;\n");
 478                 BIO_printf(out, "\tEC_GROUP *group = NULL;\n");
 479                 BIO_printf(out, "\tEC_POINT *point = NULL;\n");
 480                 BIO_printf(out, "\tBIGNUM   *tmp_1 = NULL, *tmp_2 = NULL, "
 481                     "*tmp_3 = NULL;\n\n");
 482                 BIO_printf(out, "\tif ((tmp_1 = BN_bin2bn(ec_p_%d, "
 483                     "sizeof(ec_p_%d), NULL)) == NULL)\n\t\t"
 484                     "goto err;\n", len, len);
 485                 BIO_printf(out, "\tif ((tmp_2 = BN_bin2bn(ec_a_%d, "
 486                     "sizeof(ec_a_%d), NULL)) == NULL)\n\t\t"
 487                     "goto err;\n", len, len);
 488                 BIO_printf(out, "\tif ((tmp_3 = BN_bin2bn(ec_b_%d, "
 489                     "sizeof(ec_b_%d), NULL)) == NULL)\n\t\t"
 490                     "goto err;\n", len, len);
 491                 if (is_prime) {
 492                         BIO_printf(out, "\tif ((group = EC_GROUP_new_curve_"
 493                             "GFp(tmp_1, tmp_2, tmp_3, NULL)) == NULL)"
 494                             "\n\t\tgoto err;\n\n");
 495                 } else {
 496                         BIO_printf(out, "\tif ((group = EC_GROUP_new_curve_"
 497                             "GF2m(tmp_1, tmp_2, tmp_3, NULL)) == NULL)"
 498                             "\n\t\tgoto err;\n\n");
 499                 }
 500                 BIO_printf(out, "\t/* build generator */\n");
 501                 BIO_printf(out, "\tif ((tmp_1 = BN_bin2bn(ec_gen_%d, "
 502                     "sizeof(ec_gen_%d), tmp_1)) == NULL)"
 503                     "\n\t\tgoto err;\n", len, len);
 504                 BIO_printf(out, "\tpoint = EC_POINT_bn2point(group, tmp_1, "
 505                     "NULL, NULL);\n");
 506                 BIO_printf(out, "\tif (point == NULL)\n\t\tgoto err;\n");
 507                 BIO_printf(out, "\tif ((tmp_2 = BN_bin2bn(ec_order_%d, "
 508                     "sizeof(ec_order_%d), tmp_2)) == NULL)"
 509                     "\n\t\tgoto err;\n", len, len);
 510                 BIO_printf(out, "\tif ((tmp_3 = BN_bin2bn(ec_cofactor_%d, "
 511                     "sizeof(ec_cofactor_%d), tmp_3)) == NULL)"
 512                     "\n\t\tgoto err;\n", len, len);
 513                 BIO_printf(out, "\tif (!EC_GROUP_set_generator(group, point,"
 514                     " tmp_2, tmp_3))\n\t\tgoto err;\n");
 515                 BIO_printf(out, "\n\tok=1;\n");
 516                 BIO_printf(out, "err:\n");
 517                 BIO_printf(out, "\tif (tmp_1)\n\t\tBN_free(tmp_1);\n");
 518                 BIO_printf(out, "\tif (tmp_2)\n\t\tBN_free(tmp_2);\n");
 519                 BIO_printf(out, "\tif (tmp_3)\n\t\tBN_free(tmp_3);\n");
 520                 BIO_printf(out, "\tif (point)\n\t\tEC_POINT_free(point);\n");
 521                 BIO_printf(out, "\tif (!ok)\n");
 522                 BIO_printf(out, "\t\t{\n");
 523                 BIO_printf(out, "\t\tEC_GROUP_free(group);\n");
 524                 BIO_printf(out, "\t\tgroup = NULL;\n");
 525                 BIO_printf(out, "\t\t}\n");
 526                 BIO_printf(out, "\treturn(group);\n\t}\n");
 527         }
 528         if (!ecparam_config.noout) {
 529                 if (ecparam_config.outformat == FORMAT_ASN1)
 530                         i = i2d_ECPKParameters_bio(out, group);
 531                 else if (ecparam_config.outformat == FORMAT_PEM)
 532                         i = PEM_write_bio_ECPKParameters(out, group);
 533                 else {
 534                         BIO_printf(bio_err, "bad output format specified for"
 535                             " outfile\n");
 536                         goto end;
 537                 }
 538                 if (!i) {
 539                         BIO_printf(bio_err, "unable to write elliptic "
 540                             "curve parameters\n");
 541                         ERR_print_errors(bio_err);
 542                         goto end;
 543                 }
 544         }
 545         if (ecparam_config.genkey) {
 546                 EC_KEY *eckey = EC_KEY_new();
 547
 548                 if (eckey == NULL)
 549                         goto end;
 550
 551                 if (EC_KEY_set_group(eckey, group) == 0) {
 552                         EC_KEY_free(eckey);
 553                         goto end;
 554                 }
 555
 556                 if (!EC_KEY_generate_key(eckey)) {
 557                         EC_KEY_free(eckey);
 558                         goto end;
 559                 }
 560                 if (ecparam_config.outformat == FORMAT_ASN1)
 561                         i = i2d_ECPrivateKey_bio(out, eckey);
 562                 else if (ecparam_config.outformat == FORMAT_PEM)
 563                         i = PEM_write_bio_ECPrivateKey(out, eckey, NULL,
 564                             NULL, 0, NULL, NULL);
 565                 else {
 566                         BIO_printf(bio_err, "bad output format specified "
 567                             "for outfile\n");
 568                         EC_KEY_free(eckey);
 569                         goto end;
 570                 }
 571                 EC_KEY_free(eckey);
 572         }
 573         ret = 0;
 574
 575  end:
 576         BN_free(ec_p);
 577         BN_free(ec_a);
 578         BN_free(ec_b);
 579         BN_free(ec_gen);
 580         BN_free(ec_order);
 581         BN_free(ec_cofactor);
 582
 583         free(buffer);
 584
 585         BIO_free(in);
 586         BIO_free_all(out);
 587         EC_GROUP_free(group);
 588
 589         return (ret);
 590 }
 591
 592 static int
 593 ecparam_print_var(BIO * out, BIGNUM * in, const char *var,
 594     int len, unsigned char *buffer)
 595 {
 596         BIO_printf(out, "static unsigned char %s_%d[] = {", var, len);
 597         if (BN_is_zero(in))
 598                 BIO_printf(out, "\n\t0x00");
 599         else {
 600                 int i, l;
 601
 602                 l = BN_bn2bin(in, buffer);
 603                 for (i = 0; i < l - 1; i++) {
 604                         if ((i % 12) == 0)
 605                                 BIO_printf(out, "\n\t");
 606                         BIO_printf(out, "0x%02X,", buffer[i]);
 607                 }
 608                 if ((i % 12) == 0)
 609                         BIO_printf(out, "\n\t");
 610                 BIO_printf(out, "0x%02X", buffer[i]);
 611         }
 612         BIO_printf(out, "\n\t};\n\n");
 613         return 1;
 614 }
 615 #endif