apps/ecparam.c

   1 /*
   2  * Written by Nils Larsch for the OpenSSL project.
   3  */
   4 /* ====================================================================
   5  * Copyright (c) 1998-2005 The OpenSSL Project.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  *
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the
  17  *    distribution.
  18  *
  19  * 3. All advertising materials mentioning features or use of this
  20  *    software must display the following acknowledgment:
  21  *    "This product includes software developed by the OpenSSL Project
  22  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  23  *
  24  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  25  *    endorse or promote products derived from this software without
  26  *    prior written permission. For written permission, please contact
  27  *    openssl-core@openssl.org.
  28  *
  29  * 5. Products derived from this software may not be called "OpenSSL"
  30  *    nor may "OpenSSL" appear in their names without prior written
  31  *    permission of the OpenSSL Project.
  32  *
  33  * 6. Redistributions of any form whatsoever must retain the following
  34  *    acknowledgment:
  35  *    "This product includes software developed by the OpenSSL Project
  36  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  37  *
  38  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  39  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  40  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  41  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  42  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  43  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  44  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  45  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  46  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  47  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  48  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  49  * OF THE POSSIBILITY OF SUCH DAMAGE.
  50  * ====================================================================
  51  *
  52  * This product includes cryptographic software written by Eric Young
  53  * (eay@cryptsoft.com).  This product includes software written by Tim
  54  * Hudson (tjh@cryptsoft.com).
  55  *
  56  */
  57 /* ====================================================================
  58  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
  59  *
  60  * Portions of the attached software ("Contribution") are developed by
  61  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
  62  *
  63  * The Contribution is licensed pursuant to the OpenSSL open source
  64  * license provided above.
  65  *
  66  * The elliptic curve binary polynomial software is originally written by
  67  * Sheueling Chang Shantz and Douglas Stebila of Sun Microsystems Laboratories.
  68  *
  69  */
  70
  71 #include <openssl/opensslconf.h>
  72 #ifndef OPENSSL_NO_EC
  73 # include <stdio.h>
  74 # include <stdlib.h>
  75 # include <time.h>
  76 # include <string.h>
  77 # include "apps.h"
  78 # include <openssl/bio.h>
  79 # include <openssl/err.h>
  80 # include <openssl/bn.h>
  81 # include <openssl/ec.h>
  82 # include <openssl/x509.h>
  83 # include <openssl/pem.h>
  84
  85 typedef enum OPTION_choice {
  86     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  87     OPT_INFORM, OPT_OUTFORM, OPT_IN, OPT_OUT, OPT_TEXT, OPT_C,
  88     OPT_CHECK, OPT_LIST_CURVES, OPT_NO_SEED, OPT_NOOUT, OPT_NAME,
  89     OPT_CONV_FORM, OPT_PARAM_ENC, OPT_GENKEY, OPT_RAND, OPT_ENGINE
  90 } OPTION_CHOICE;
  91
  92 OPTIONS ecparam_options[] = {
  93     {"help", OPT_HELP, '-', "Display this summary"},
  94     {"inform", OPT_INFORM, 'F', "Input format - default PEM (DER or PEM)"},
  95     {"outform", OPT_OUTFORM, 'F', "Output format - default PEM"},
  96     {"in", OPT_IN, '<', "Input file  - default stdin"},
  97     {"out", OPT_OUT, '>', "Output file - default stdout"},
  98     {"text", OPT_TEXT, '-', "Print the ec parameters in text form"},
  99     {"C", OPT_C, '-', "Print a 'C' function creating the parameters"},
 100     {"check", OPT_CHECK, '-', "Validate the ec parameters"},
 101     {"list_curves", OPT_LIST_CURVES, '-',
 102      "Prints a list of all curve 'short names'"},
 103     {"no_seed", OPT_NO_SEED, '-',
 104      "If 'explicit' parameters are chosen do not use the seed"},
 105     {"noout", OPT_NOOUT, '-', "Do not print the ec parameter"},
 106     {"name", OPT_NAME, 's',
 107      "Use the ec parameters with specified 'short name'"},
 108     {"conv_form", OPT_CONV_FORM, 's', "Specifies the point conversion form "},
 109     {"param_enc", OPT_PARAM_ENC, 's',
 110      "Specifies the way the ec parameters are encoded"},
 111     {"genkey", OPT_GENKEY, '-', "Generate ec key"},
 112     {"rand", OPT_RAND, 's', "Files to use for random number input"},
 113 # ifndef OPENSSL_NO_ENGINE
 114     {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
 115 # endif
 116     {NULL}
 117 };
 118
 119 static OPT_PAIR forms[] = {
 120     {"compressed", POINT_CONVERSION_COMPRESSED},
 121     {"uncompressed", POINT_CONVERSION_UNCOMPRESSED},
 122     {"hybrid", POINT_CONVERSION_HYBRID},
 123     {NULL}
 124 };
 125
 126 static OPT_PAIR encodings[] = {
 127     {"named_curve", OPENSSL_EC_NAMED_CURVE},
 128     {"explicit", 0},
 129     {NULL}
 130 };
 131
 132 int ecparam_main(int argc, char **argv)
 133 {
 134     BIGNUM *ec_gen = NULL, *ec_order = NULL, *ec_cofactor = NULL;
 135     BIGNUM *ec_p = NULL, *ec_a = NULL, *ec_b = NULL;
 136     BIO *in = NULL, *out = NULL;
 137     EC_GROUP *group = NULL;
 138     point_conversion_form_t form = POINT_CONVERSION_UNCOMPRESSED;
 139     char *curve_name = NULL, *inrand = NULL;
 140     char *infile = NULL, *outfile = NULL, *prog;
 141     unsigned char *buffer = NULL;
 142     OPTION_CHOICE o;
 143     int asn1_flag = OPENSSL_EC_NAMED_CURVE, new_asn1_flag = 0;
 144     int informat = FORMAT_PEM, outformat = FORMAT_PEM, noout = 0, C = 0;
 145     int ret = 1, private = 0;
 146     int list_curves = 0, no_seed = 0, check = 0, new_form = 0;
 147     int text = 0, i, need_rand = 0, genkey = 0;
 148
 149     prog = opt_init(argc, argv, ecparam_options);
 150     while ((o = opt_next()) != OPT_EOF) {
 151         switch (o) {
 152         case OPT_EOF:
 153         case OPT_ERR:
 154  opthelp:
 155             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 156             goto end;
 157         case OPT_HELP:
 158             opt_help(ecparam_options);
 159             ret = 0;
 160             goto end;
 161         case OPT_INFORM:
 162             if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
 163                 goto opthelp;
 164             break;
 165         case OPT_IN:
 166             infile = opt_arg();
 167             break;
 168         case OPT_OUTFORM:
 169             if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))
 170                 goto opthelp;
 171             break;
 172         case OPT_OUT:
 173             outfile = opt_arg();
 174             break;
 175         case OPT_TEXT:
 176             text = 1;
 177             break;
 178         case OPT_C:
 179             C = 1;
 180             break;
 181         case OPT_CHECK:
 182             check = 1;
 183             break;
 184         case OPT_LIST_CURVES:
 185             list_curves = 1;
 186             break;
 187         case OPT_NO_SEED:
 188             no_seed = 1;
 189             break;
 190         case OPT_NOOUT:
 191             noout = 1;
 192             break;
 193         case OPT_NAME:
 194             curve_name = opt_arg();
 195             break;
 196         case OPT_CONV_FORM:
 197             if (!opt_pair(opt_arg(), forms, &new_form))
 198                 goto opthelp;
 199             form = new_form;
 200             new_form = 1;
 201             break;
 202         case OPT_PARAM_ENC:
 203             if (!opt_pair(opt_arg(), encodings, &asn1_flag))
 204                 goto opthelp;
 205             new_asn1_flag = 1;
 206             break;
 207         case OPT_GENKEY:
 208             genkey = need_rand = 1;
 209             break;
 210         case OPT_RAND:
 211             inrand = opt_arg();
 212             need_rand = 1;
 213             break;
 214         case OPT_ENGINE:
 215             (void)setup_engine(opt_arg(), 0);
 216             break;
 217         }
 218     }
 219     argc = opt_num_rest();
 220     argv = opt_rest();
 221     private = genkey ? 1 : 0;
 222
 223     in = bio_open_default(infile, 'r', informat);
 224     if (in == NULL)
 225         goto end;
 226     out = bio_open_owner(outfile, outformat, private);
 227     if (out == NULL)
 228         goto end;
 229
 230     if (list_curves) {
 231         EC_builtin_curve *curves = NULL;
 232         size_t crv_len = EC_get_builtin_curves(NULL, 0);
 233         size_t n;
 234
 235         curves = app_malloc((int)sizeof(*curves) * crv_len, "list curves");
 236         if (!EC_get_builtin_curves(curves, crv_len)) {
 237             OPENSSL_free(curves);
 238             goto end;
 239         }
 240
 241         for (n = 0; n < crv_len; n++) {
 242             const char *comment;
 243             const char *sname;
 244             comment = curves[n].comment;
 245             sname = OBJ_nid2sn(curves[n].nid);
 246             if (comment == NULL)
 247                 comment = "CURVE DESCRIPTION NOT AVAILABLE";
 248             if (sname == NULL)
 249                 sname = "";
 250
 251             BIO_printf(out, "  %-10s: ", sname);
 252             BIO_printf(out, "%s\n", comment);
 253         }
 254
 255         OPENSSL_free(curves);
 256         ret = 0;
 257         goto end;
 258     }
 259
 260     if (curve_name != NULL) {
 261         int nid;
 262
 263         /*
 264          * workaround for the SECG curve names secp192r1 and secp256r1 (which
 265          * are the same as the curves prime192v1 and prime256v1 defined in
 266          * X9.62)
 267          */
 268         if (strcmp(curve_name, "secp192r1") == 0) {
 269             BIO_printf(bio_err, "using curve name prime192v1 "
 270                        "instead of secp192r1\n");
 271             nid = NID_X9_62_prime192v1;
 272         } else if (strcmp(curve_name, "secp256r1") == 0) {
 273             BIO_printf(bio_err, "using curve name prime256v1 "
 274                        "instead of secp256r1\n");
 275             nid = NID_X9_62_prime256v1;
 276         } else
 277             nid = OBJ_sn2nid(curve_name);
 278
 279         if (nid == 0)
 280             nid = EC_curve_nist2nid(curve_name);
 281
 282         if (nid == 0) {
 283             BIO_printf(bio_err, "unknown curve name (%s)\n", curve_name);
 284             goto end;
 285         }
 286
 287         group = EC_GROUP_new_by_curve_name(nid);
 288         if (group == NULL) {
 289             BIO_printf(bio_err, "unable to create curve (%s)\n", curve_name);
 290             goto end;
 291         }
 292         EC_GROUP_set_asn1_flag(group, asn1_flag);
 293         EC_GROUP_set_point_conversion_form(group, form);
 294     } else if (informat == FORMAT_ASN1)
 295         group = d2i_ECPKParameters_bio(in, NULL);
 296     else
 297         group = PEM_read_bio_ECPKParameters(in, NULL, NULL, NULL);
 298     if (group == NULL) {
 299         BIO_printf(bio_err, "unable to load elliptic curve parameters\n");
 300         ERR_print_errors(bio_err);
 301         goto end;
 302     }
 303
 304     if (new_form)
 305         EC_GROUP_set_point_conversion_form(group, form);
 306
 307     if (new_asn1_flag)
 308         EC_GROUP_set_asn1_flag(group, asn1_flag);
 309
 310     if (no_seed) {
 311         EC_GROUP_set_seed(group, NULL, 0);
 312     }
 313
 314     if (text) {
 315         if (!ECPKParameters_print(out, group, 0))
 316             goto end;
 317     }
 318
 319     if (check) {
 320         if (group == NULL)
 321             BIO_printf(bio_err, "no elliptic curve parameters\n");
 322         BIO_printf(bio_err, "checking elliptic curve parameters: ");
 323         if (!EC_GROUP_check(group, NULL)) {
 324             BIO_printf(bio_err, "failed\n");
 325             ERR_print_errors(bio_err);
 326             goto end;
 327         }
 328         BIO_printf(bio_err, "ok\n");
 329
 330     }
 331
 332     if (C) {
 333         size_t buf_len = 0, tmp_len = 0;
 334         const EC_POINT *point;
 335         int is_prime, len = 0;
 336         const EC_METHOD *meth = EC_GROUP_method_of(group);
 337
 338         if ((ec_p = BN_new()) == NULL
 339                 || (ec_a = BN_new()) == NULL
 340                 || (ec_b = BN_new()) == NULL
 341                 || (ec_gen = BN_new()) == NULL
 342                 || (ec_order = BN_new()) == NULL
 343                 || (ec_cofactor = BN_new()) == NULL) {
 344             perror("Can't allocate BN");
 345             goto end;
 346         }
 347
 348         is_prime = (EC_METHOD_get_field_type(meth) == NID_X9_62_prime_field);
 349         if (!is_prime) {
 350             BIO_printf(bio_err, "Can only handle X9.62 prime fields\n");
 351             goto end;
 352         }
 353
 354         if (!EC_GROUP_get_curve_GFp(group, ec_p, ec_a, ec_b, NULL))
 355             goto end;
 356
 357         if ((point = EC_GROUP_get0_generator(group)) == NULL)
 358             goto end;
 359         if (!EC_POINT_point2bn(group, point,
 360                                EC_GROUP_get_point_conversion_form(group),
 361                                ec_gen, NULL))
 362             goto end;
 363         if (!EC_GROUP_get_order(group, ec_order, NULL))
 364             goto end;
 365         if (!EC_GROUP_get_cofactor(group, ec_cofactor, NULL))
 366             goto end;
 367
 368         if (!ec_p || !ec_a || !ec_b || !ec_gen || !ec_order || !ec_cofactor)
 369             goto end;
 370
 371         len = BN_num_bits(ec_order);
 372
 373         if ((tmp_len = (size_t)BN_num_bytes(ec_p)) > buf_len)
 374             buf_len = tmp_len;
 375         if ((tmp_len = (size_t)BN_num_bytes(ec_a)) > buf_len)
 376             buf_len = tmp_len;
 377         if ((tmp_len = (size_t)BN_num_bytes(ec_b)) > buf_len)
 378             buf_len = tmp_len;
 379         if ((tmp_len = (size_t)BN_num_bytes(ec_gen)) > buf_len)
 380             buf_len = tmp_len;
 381         if ((tmp_len = (size_t)BN_num_bytes(ec_order)) > buf_len)
 382             buf_len = tmp_len;
 383         if ((tmp_len = (size_t)BN_num_bytes(ec_cofactor)) > buf_len)
 384             buf_len = tmp_len;
 385
 386         buffer = app_malloc(buf_len, "BN buffer");
 387
 388         BIO_printf(out, "EC_GROUP *get_ec_group_%d(void)\n{\n", len);
 389         print_bignum_var(out, ec_p, "ec_p", len, buffer);
 390         print_bignum_var(out, ec_a, "ec_a", len, buffer);
 391         print_bignum_var(out, ec_b, "ec_b", len, buffer);
 392         print_bignum_var(out, ec_gen, "ec_gen", len, buffer);
 393         print_bignum_var(out, ec_order, "ec_order", len, buffer);
 394         print_bignum_var(out, ec_cofactor, "ec_cofactor", len, buffer);
 395         BIO_printf(out, "    int ok = 0;\n"
 396                         "    EC_GROUP *group = NULL;\n"
 397                         "    EC_POINT *point = NULL;\n"
 398                         "    BIGNUM *tmp_1 = NULL;\n"
 399                         "    BIGNUM *tmp_2 = NULL;\n"
 400                         "    BIGNUM *tmp_3 = NULL;\n"
 401                         "\n");
 402
 403         BIO_printf(out, "    if ((tmp_1 = BN_bin2bn(ec_p_%d, sizeof (ec_p_%d), NULL)) == NULL)\n"
 404                         "        goto err;\n", len, len);
 405         BIO_printf(out, "    if ((tmp_2 = BN_bin2bn(ec_a_%d, sizeof (ec_a_%d), NULL)) == NULL)\n"
 406                         "        goto err;\n", len, len);
 407         BIO_printf(out, "    if ((tmp_3 = BN_bin2bn(ec_b_%d, sizeof (ec_b_%d), NULL)) == NULL)\n"
 408                         "        goto err;\n", len, len);
 409         BIO_printf(out, "    if ((group = EC_GROUP_new_curve_GFp(tmp_1, tmp_2, tmp_3, NULL)) == NULL)\n"
 410                         "        goto err;\n"
 411                         "\n");
 412         BIO_printf(out, "    /* build generator */\n");
 413         BIO_printf(out, "    if ((tmp_1 = BN_bin2bn(ec_gen_%d, sizeof (ec_gen_%d), tmp_1)) == NULL)\n"
 414                         "        goto err;\n", len, len);
 415         BIO_printf(out, "    point = EC_POINT_bn2point(group, tmp_1, NULL, NULL);\n");
 416         BIO_printf(out, "    if (point == NULL)\n"
 417                         "        goto err;\n");
 418         BIO_printf(out, "    if ((tmp_2 = BN_bin2bn(ec_order_%d, sizeof (ec_order_%d), tmp_2)) == NULL)\n"
 419                         "        goto err;\n", len, len);
 420         BIO_printf(out, "    if ((tmp_3 = BN_bin2bn(ec_cofactor_%d, sizeof (ec_cofactor_%d), tmp_3)) == NULL)\n"
 421                         "        goto err;\n", len, len);
 422         BIO_printf(out, "    if (!EC_GROUP_set_generator(group, point, tmp_2, tmp_3))\n"
 423                         "        goto err;\n"
 424                         "ok = 1;"
 425                         "\n");
 426         BIO_printf(out, "err:\n"
 427                         "    BN_free(tmp_1);\n"
 428                         "    BN_free(tmp_2);\n"
 429                         "    BN_free(tmp_3);\n"
 430                         "    EC_POINT_free(point);\n"
 431                         "    if (!ok) {\n"
 432                         "        EC_GROUP_free(group);\n"
 433                         "        return NULL;\n"
 434                         "    }\n"
 435                         "    return (group);\n"
 436                         "}\n");
 437     }
 438
 439     if (!noout) {
 440         if (outformat == FORMAT_ASN1)
 441             i = i2d_ECPKParameters_bio(out, group);
 442         else
 443             i = PEM_write_bio_ECPKParameters(out, group);
 444         if (!i) {
 445             BIO_printf(bio_err, "unable to write elliptic "
 446                        "curve parameters\n");
 447             ERR_print_errors(bio_err);
 448             goto end;
 449         }
 450     }
 451
 452     if (need_rand) {
 453         app_RAND_load_file(NULL, (inrand != NULL));
 454         if (inrand != NULL)
 455             BIO_printf(bio_err, "%ld semi-random bytes loaded\n",
 456                        app_RAND_load_files(inrand));
 457     }
 458
 459     if (genkey) {
 460         EC_KEY *eckey = EC_KEY_new();
 461
 462         if (eckey == NULL)
 463             goto end;
 464
 465         assert(need_rand);
 466
 467         if (EC_KEY_set_group(eckey, group) == 0)
 468             goto end;
 469
 470         if (!EC_KEY_generate_key(eckey)) {
 471             EC_KEY_free(eckey);
 472             goto end;
 473         }
 474         assert(private);
 475         if (outformat == FORMAT_ASN1)
 476             i = i2d_ECPrivateKey_bio(out, eckey);
 477         else
 478             i = PEM_write_bio_ECPrivateKey(out, eckey, NULL,
 479                                            NULL, 0, NULL, NULL);
 480         EC_KEY_free(eckey);
 481     }
 482
 483     if (need_rand)
 484         app_RAND_write_file(NULL);
 485
 486     ret = 0;
 487  end:
 488     BN_free(ec_p);
 489     BN_free(ec_a);
 490     BN_free(ec_b);
 491     BN_free(ec_gen);
 492     BN_free(ec_order);
 493     BN_free(ec_cofactor);
 494     OPENSSL_free(buffer);
 495     BIO_free(in);
 496     BIO_free_all(out);
 497     EC_GROUP_free(group);
 498     return (ret);
 499 }
 500
 501 #else                           /* !OPENSSL_NO_EC */
 502
 503 # if PEDANTIC
 504 static void *dummy = &dummy;
 505 # endif
 506
 507 #endif