apps/ecparam.c

   1 /*
   2  * Copyright 2002-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
   4  *
   5  * Licensed under the Apache License 2.0 (the "License").  You may not use
   6  * this file except in compliance with the License.  You can obtain a copy
   7  * in the file LICENSE in the source distribution or at
   8  * https://www.openssl.org/source/license.html
   9  */
  10
  11 #include <openssl/opensslconf.h>
  12 #ifdef OPENSSL_NO_EC
  13 NON_EMPTY_TRANSLATION_UNIT
  14 #else
  15
  16 # include <stdio.h>
  17 # include <stdlib.h>
  18 # include <time.h>
  19 # include <string.h>
  20 # include "apps.h"
  21 # include "progs.h"
  22 # include <openssl/bio.h>
  23 # include <openssl/err.h>
  24 # include <openssl/bn.h>
  25 # include <openssl/ec.h>
  26 # include <openssl/x509.h>
  27 # include <openssl/pem.h>
  28
  29 typedef enum OPTION_choice {
  30     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  31     OPT_INFORM, OPT_OUTFORM, OPT_IN, OPT_OUT, OPT_TEXT, OPT_C,
  32     OPT_CHECK, OPT_LIST_CURVES, OPT_NO_SEED, OPT_NOOUT, OPT_NAME,
  33     OPT_CONV_FORM, OPT_PARAM_ENC, OPT_GENKEY, OPT_ENGINE, OPT_CHECK_NAMED,
  34     OPT_R_ENUM
  35 } OPTION_CHOICE;
  36
  37 const OPTIONS ecparam_options[] = {
  38     OPT_SECTION("General"),
  39     {"help", OPT_HELP, '-', "Display this summary"},
  40     {"list_curves", OPT_LIST_CURVES, '-',
  41      "Prints a list of all curve 'short names'"},
  42 # ifndef OPENSSL_NO_ENGINE
  43     {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
  44 # endif
  45
  46     {"genkey", OPT_GENKEY, '-', "Generate ec key"},
  47     {"in", OPT_IN, '<', "Input file  - default stdin"},
  48     {"inform", OPT_INFORM, 'F', "Input format - default PEM (DER or PEM)"},
  49     {"out", OPT_OUT, '>', "Output file - default stdout"},
  50     {"outform", OPT_OUTFORM, 'F', "Output format - default PEM"},
  51
  52     OPT_SECTION("Output"),
  53     {"text", OPT_TEXT, '-', "Print the ec parameters in text form"},
  54     {"C", OPT_C, '-', "Print a 'C' function creating the parameters"},
  55     {"noout", OPT_NOOUT, '-', "Do not print the ec parameter"},
  56     {"param_enc", OPT_PARAM_ENC, 's',
  57      "Specifies the way the ec parameters are encoded"},
  58
  59     OPT_SECTION("Parameter"),
  60     {"check", OPT_CHECK, '-', "Validate the ec parameters"},
  61     {"check_named", OPT_CHECK_NAMED, '-',
  62      "Check that named EC curve parameters have not been modified"},
  63     {"no_seed", OPT_NO_SEED, '-',
  64      "If 'explicit' parameters are chosen do not use the seed"},
  65     {"name", OPT_NAME, 's',
  66      "Use the ec parameters with specified 'short name'"},
  67     {"conv_form", OPT_CONV_FORM, 's', "Specifies the point conversion form "},
  68
  69     OPT_R_OPTIONS,
  70     {NULL}
  71 };
  72
  73 static OPT_PAIR forms[] = {
  74     {"compressed", POINT_CONVERSION_COMPRESSED},
  75     {"uncompressed", POINT_CONVERSION_UNCOMPRESSED},
  76     {"hybrid", POINT_CONVERSION_HYBRID},
  77     {NULL}
  78 };
  79
  80 static OPT_PAIR encodings[] = {
  81     {"named_curve", OPENSSL_EC_NAMED_CURVE},
  82     {"explicit", 0},
  83     {NULL}
  84 };
  85
  86 int ecparam_main(int argc, char **argv)
  87 {
  88     ENGINE *e = NULL;
  89     BIGNUM *ec_gen = NULL, *ec_order = NULL, *ec_cofactor = NULL;
  90     BIGNUM *ec_p = NULL, *ec_a = NULL, *ec_b = NULL;
  91     BIO *in = NULL, *out = NULL;
  92     EC_GROUP *group = NULL;
  93     point_conversion_form_t form = POINT_CONVERSION_UNCOMPRESSED;
  94     char *curve_name = NULL;
  95     char *infile = NULL, *outfile = NULL, *prog;
  96     unsigned char *buffer = NULL;
  97     OPTION_CHOICE o;
  98     int asn1_flag = OPENSSL_EC_NAMED_CURVE, new_asn1_flag = 0;
  99     int informat = FORMAT_PEM, outformat = FORMAT_PEM, noout = 0, C = 0;
 100     int ret = 1, private = 0;
 101     int list_curves = 0, no_seed = 0, check = 0, new_form = 0;
 102     int text = 0, i, genkey = 0, check_named = 0;
 103
 104     prog = opt_init(argc, argv, ecparam_options);
 105     while ((o = opt_next()) != OPT_EOF) {
 106         switch (o) {
 107         case OPT_EOF:
 108         case OPT_ERR:
 109  opthelp:
 110             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 111             goto end;
 112         case OPT_HELP:
 113             opt_help(ecparam_options);
 114             ret = 0;
 115             goto end;
 116         case OPT_INFORM:
 117             if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
 118                 goto opthelp;
 119             break;
 120         case OPT_IN:
 121             infile = opt_arg();
 122             break;
 123         case OPT_OUTFORM:
 124             if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))
 125                 goto opthelp;
 126             break;
 127         case OPT_OUT:
 128             outfile = opt_arg();
 129             break;
 130         case OPT_TEXT:
 131             text = 1;
 132             break;
 133         case OPT_C:
 134             C = 1;
 135             break;
 136         case OPT_CHECK:
 137             check = 1;
 138             break;
 139         case OPT_CHECK_NAMED:
 140             check_named = 1;
 141             break;
 142         case OPT_LIST_CURVES:
 143             list_curves = 1;
 144             break;
 145         case OPT_NO_SEED:
 146             no_seed = 1;
 147             break;
 148         case OPT_NOOUT:
 149             noout = 1;
 150             break;
 151         case OPT_NAME:
 152             curve_name = opt_arg();
 153             break;
 154         case OPT_CONV_FORM:
 155             if (!opt_pair(opt_arg(), forms, &new_form))
 156                 goto opthelp;
 157             form = new_form;
 158             new_form = 1;
 159             break;
 160         case OPT_PARAM_ENC:
 161             if (!opt_pair(opt_arg(), encodings, &asn1_flag))
 162                 goto opthelp;
 163             new_asn1_flag = 1;
 164             break;
 165         case OPT_GENKEY:
 166             genkey = 1;
 167             break;
 168         case OPT_R_CASES:
 169             if (!opt_rand(o))
 170                 goto end;
 171             break;
 172         case OPT_ENGINE:
 173             e = setup_engine(opt_arg(), 0);
 174             break;
 175         }
 176     }
 177     argc = opt_num_rest();
 178     if (argc != 0)
 179         goto opthelp;
 180
 181     private = genkey ? 1 : 0;
 182
 183     in = bio_open_default(infile, 'r', informat);
 184     if (in == NULL)
 185         goto end;
 186     out = bio_open_owner(outfile, outformat, private);
 187     if (out == NULL)
 188         goto end;
 189
 190     if (list_curves) {
 191         EC_builtin_curve *curves = NULL;
 192         size_t crv_len = EC_get_builtin_curves(NULL, 0);
 193         size_t n;
 194
 195         curves = app_malloc((int)sizeof(*curves) * crv_len, "list curves");
 196         if (!EC_get_builtin_curves(curves, crv_len)) {
 197             OPENSSL_free(curves);
 198             goto end;
 199         }
 200
 201         for (n = 0; n < crv_len; n++) {
 202             const char *comment;
 203             const char *sname;
 204             comment = curves[n].comment;
 205             sname = OBJ_nid2sn(curves[n].nid);
 206             if (comment == NULL)
 207                 comment = "CURVE DESCRIPTION NOT AVAILABLE";
 208             if (sname == NULL)
 209                 sname = "";
 210
 211             BIO_printf(out, "  %-10s: ", sname);
 212             BIO_printf(out, "%s\n", comment);
 213         }
 214
 215         OPENSSL_free(curves);
 216         ret = 0;
 217         goto end;
 218     }
 219
 220     if (curve_name != NULL) {
 221         int nid;
 222
 223         /*
 224          * workaround for the SECG curve names secp192r1 and secp256r1 (which
 225          * are the same as the curves prime192v1 and prime256v1 defined in
 226          * X9.62)
 227          */
 228         if (strcmp(curve_name, "secp192r1") == 0) {
 229             BIO_printf(bio_err, "using curve name prime192v1 "
 230                        "instead of secp192r1\n");
 231             nid = NID_X9_62_prime192v1;
 232         } else if (strcmp(curve_name, "secp256r1") == 0) {
 233             BIO_printf(bio_err, "using curve name prime256v1 "
 234                        "instead of secp256r1\n");
 235             nid = NID_X9_62_prime256v1;
 236         } else {
 237             nid = OBJ_sn2nid(curve_name);
 238         }
 239
 240         if (nid == 0)
 241             nid = EC_curve_nist2nid(curve_name);
 242
 243         if (nid == 0) {
 244             BIO_printf(bio_err, "unknown curve name (%s)\n", curve_name);
 245             goto end;
 246         }
 247
 248         group = EC_GROUP_new_by_curve_name(nid);
 249         if (group == NULL) {
 250             BIO_printf(bio_err, "unable to create curve (%s)\n", curve_name);
 251             goto end;
 252         }
 253         EC_GROUP_set_asn1_flag(group, asn1_flag);
 254         EC_GROUP_set_point_conversion_form(group, form);
 255     } else if (informat == FORMAT_ASN1) {
 256         group = d2i_ECPKParameters_bio(in, NULL);
 257     } else {
 258         group = PEM_read_bio_ECPKParameters(in, NULL, NULL, NULL);
 259     }
 260     if (group == NULL) {
 261         BIO_printf(bio_err, "unable to load elliptic curve parameters\n");
 262         ERR_print_errors(bio_err);
 263         goto end;
 264     }
 265
 266     if (new_form)
 267         EC_GROUP_set_point_conversion_form(group, form);
 268
 269     if (new_asn1_flag)
 270         EC_GROUP_set_asn1_flag(group, asn1_flag);
 271
 272     if (no_seed) {
 273         EC_GROUP_set_seed(group, NULL, 0);
 274     }
 275
 276     if (text) {
 277         if (!ECPKParameters_print(out, group, 0))
 278             goto end;
 279     }
 280
 281     if (check_named) {
 282         BIO_printf(bio_err, "validating named elliptic curve parameters: ");
 283         if (EC_GROUP_check_named_curve(group, 0, NULL) <= 0) {
 284             BIO_printf(bio_err, "failed\n");
 285             ERR_print_errors(bio_err);
 286             goto end;
 287         }
 288         BIO_printf(bio_err, "ok\n");
 289     }
 290
 291     if (check) {
 292         BIO_printf(bio_err, "checking elliptic curve parameters: ");
 293         if (!EC_GROUP_check(group, NULL)) {
 294             BIO_printf(bio_err, "failed\n");
 295             ERR_print_errors(bio_err);
 296             goto end;
 297         }
 298         BIO_printf(bio_err, "ok\n");
 299
 300     }
 301
 302     if (C) {
 303         size_t buf_len = 0, tmp_len = 0;
 304         const EC_POINT *point;
 305         int is_prime, len = 0;
 306         const EC_METHOD *meth = EC_GROUP_method_of(group);
 307
 308         if ((ec_p = BN_new()) == NULL
 309                 || (ec_a = BN_new()) == NULL
 310                 || (ec_b = BN_new()) == NULL
 311                 || (ec_gen = BN_new()) == NULL
 312                 || (ec_order = BN_new()) == NULL
 313                 || (ec_cofactor = BN_new()) == NULL) {
 314             perror("Can't allocate BN");
 315             goto end;
 316         }
 317
 318         is_prime = (EC_METHOD_get_field_type(meth) == NID_X9_62_prime_field);
 319         if (!is_prime) {
 320             BIO_printf(bio_err, "Can only handle X9.62 prime fields\n");
 321             goto end;
 322         }
 323
 324         if (!EC_GROUP_get_curve(group, ec_p, ec_a, ec_b, NULL))
 325             goto end;
 326
 327         if ((point = EC_GROUP_get0_generator(group)) == NULL)
 328             goto end;
 329         if (!EC_POINT_point2bn(group, point,
 330                                EC_GROUP_get_point_conversion_form(group),
 331                                ec_gen, NULL))
 332             goto end;
 333         if (!EC_GROUP_get_order(group, ec_order, NULL))
 334             goto end;
 335         if (!EC_GROUP_get_cofactor(group, ec_cofactor, NULL))
 336             goto end;
 337
 338         if (!ec_p || !ec_a || !ec_b || !ec_gen || !ec_order || !ec_cofactor)
 339             goto end;
 340
 341         len = BN_num_bits(ec_order);
 342
 343         if ((tmp_len = (size_t)BN_num_bytes(ec_p)) > buf_len)
 344             buf_len = tmp_len;
 345         if ((tmp_len = (size_t)BN_num_bytes(ec_a)) > buf_len)
 346             buf_len = tmp_len;
 347         if ((tmp_len = (size_t)BN_num_bytes(ec_b)) > buf_len)
 348             buf_len = tmp_len;
 349         if ((tmp_len = (size_t)BN_num_bytes(ec_gen)) > buf_len)
 350             buf_len = tmp_len;
 351         if ((tmp_len = (size_t)BN_num_bytes(ec_order)) > buf_len)
 352             buf_len = tmp_len;
 353         if ((tmp_len = (size_t)BN_num_bytes(ec_cofactor)) > buf_len)
 354             buf_len = tmp_len;
 355
 356         buffer = app_malloc(buf_len, "BN buffer");
 357
 358         BIO_printf(out, "EC_GROUP *get_ec_group_%d(void)\n{\n", len);
 359         print_bignum_var(out, ec_p, "ec_p", len, buffer);
 360         print_bignum_var(out, ec_a, "ec_a", len, buffer);
 361         print_bignum_var(out, ec_b, "ec_b", len, buffer);
 362         print_bignum_var(out, ec_gen, "ec_gen", len, buffer);
 363         print_bignum_var(out, ec_order, "ec_order", len, buffer);
 364         print_bignum_var(out, ec_cofactor, "ec_cofactor", len, buffer);
 365         BIO_printf(out, "    int ok = 0;\n"
 366                         "    EC_GROUP *group = NULL;\n"
 367                         "    EC_POINT *point = NULL;\n"
 368                         "    BIGNUM *tmp_1 = NULL;\n"
 369                         "    BIGNUM *tmp_2 = NULL;\n"
 370                         "    BIGNUM *tmp_3 = NULL;\n"
 371                         "\n");
 372
 373         BIO_printf(out, "    if ((tmp_1 = BN_bin2bn(ec_p_%d, sizeof(ec_p_%d), NULL)) == NULL)\n"
 374                         "        goto err;\n", len, len);
 375         BIO_printf(out, "    if ((tmp_2 = BN_bin2bn(ec_a_%d, sizeof(ec_a_%d), NULL)) == NULL)\n"
 376                         "        goto err;\n", len, len);
 377         BIO_printf(out, "    if ((tmp_3 = BN_bin2bn(ec_b_%d, sizeof(ec_b_%d), NULL)) == NULL)\n"
 378                         "        goto err;\n", len, len);
 379         BIO_printf(out, "    if ((group = EC_GROUP_new_curve_GFp(tmp_1, tmp_2, tmp_3, NULL)) == NULL)\n"
 380                         "        goto err;\n"
 381                         "\n");
 382         BIO_printf(out, "    /* build generator */\n");
 383         BIO_printf(out, "    if ((tmp_1 = BN_bin2bn(ec_gen_%d, sizeof(ec_gen_%d), tmp_1)) == NULL)\n"
 384                         "        goto err;\n", len, len);
 385         BIO_printf(out, "    point = EC_POINT_bn2point(group, tmp_1, NULL, NULL);\n");
 386         BIO_printf(out, "    if (point == NULL)\n"
 387                         "        goto err;\n");
 388         BIO_printf(out, "    if ((tmp_2 = BN_bin2bn(ec_order_%d, sizeof(ec_order_%d), tmp_2)) == NULL)\n"
 389                         "        goto err;\n", len, len);
 390         BIO_printf(out, "    if ((tmp_3 = BN_bin2bn(ec_cofactor_%d, sizeof(ec_cofactor_%d), tmp_3)) == NULL)\n"
 391                         "        goto err;\n", len, len);
 392         BIO_printf(out, "    if (!EC_GROUP_set_generator(group, point, tmp_2, tmp_3))\n"
 393                         "        goto err;\n"
 394                         "ok = 1;"
 395                         "\n");
 396         BIO_printf(out, "err:\n"
 397                         "    BN_free(tmp_1);\n"
 398                         "    BN_free(tmp_2);\n"
 399                         "    BN_free(tmp_3);\n"
 400                         "    EC_POINT_free(point);\n"
 401                         "    if (!ok) {\n"
 402                         "        EC_GROUP_free(group);\n"
 403                         "        return NULL;\n"
 404                         "    }\n"
 405                         "    return (group);\n"
 406                         "}\n");
 407     }
 408
 409     if (outformat == FORMAT_ASN1 && genkey)
 410         noout = 1;
 411
 412     if (!noout) {
 413         if (outformat == FORMAT_ASN1)
 414             i = i2d_ECPKParameters_bio(out, group);
 415         else
 416             i = PEM_write_bio_ECPKParameters(out, group);
 417         if (!i) {
 418             BIO_printf(bio_err, "unable to write elliptic "
 419                        "curve parameters\n");
 420             ERR_print_errors(bio_err);
 421             goto end;
 422         }
 423     }
 424
 425     if (genkey) {
 426         EC_KEY *eckey = EC_KEY_new();
 427
 428         if (eckey == NULL)
 429             goto end;
 430
 431         if (EC_KEY_set_group(eckey, group) == 0) {
 432             BIO_printf(bio_err, "unable to set group when generating key\n");
 433             EC_KEY_free(eckey);
 434             ERR_print_errors(bio_err);
 435             goto end;
 436         }
 437
 438         if (new_form)
 439             EC_KEY_set_conv_form(eckey, form);
 440
 441         if (!EC_KEY_generate_key(eckey)) {
 442             BIO_printf(bio_err, "unable to generate key\n");
 443             EC_KEY_free(eckey);
 444             ERR_print_errors(bio_err);
 445             goto end;
 446         }
 447         assert(private);
 448         if (outformat == FORMAT_ASN1)
 449             i = i2d_ECPrivateKey_bio(out, eckey);
 450         else
 451             i = PEM_write_bio_ECPrivateKey(out, eckey, NULL,
 452                                            NULL, 0, NULL, NULL);
 453         EC_KEY_free(eckey);
 454     }
 455
 456     ret = 0;
 457  end:
 458     BN_free(ec_p);
 459     BN_free(ec_a);
 460     BN_free(ec_b);
 461     BN_free(ec_gen);
 462     BN_free(ec_order);
 463     BN_free(ec_cofactor);
 464     OPENSSL_free(buffer);
 465     EC_GROUP_free(group);
 466     release_engine(e);
 467     BIO_free(in);
 468     BIO_free_all(out);
 469     return ret;
 470 }
 471
 472 #endif