apps/ecparam.c

   1 /*
   2  * Copyright 2002-2017 The OpenSSL Project Authors. All Rights Reserved.
   3  * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
   4  *
   5  * Licensed under the OpenSSL license (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 <openssl/bio.h>
  22 # include <openssl/err.h>
  23 # include <openssl/bn.h>
  24 # include <openssl/ec.h>
  25 # include <openssl/x509.h>
  26 # include <openssl/pem.h>
  27
  28 typedef enum OPTION_choice {
  29     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  30     OPT_INFORM, OPT_OUTFORM, OPT_IN, OPT_OUT, OPT_TEXT, OPT_C,
  31     OPT_CHECK, OPT_LIST_CURVES, OPT_NO_SEED, OPT_NOOUT, OPT_NAME,
  32     OPT_CONV_FORM, OPT_PARAM_ENC, OPT_GENKEY, OPT_RAND, OPT_ENGINE
  33 } OPTION_CHOICE;
  34
  35 const OPTIONS ecparam_options[] = {
  36     {"help", OPT_HELP, '-', "Display this summary"},
  37     {"inform", OPT_INFORM, 'F', "Input format - default PEM (DER or PEM)"},
  38     {"outform", OPT_OUTFORM, 'F', "Output format - default PEM"},
  39     {"in", OPT_IN, '<', "Input file  - default stdin"},
  40     {"out", OPT_OUT, '>', "Output file - default stdout"},
  41     {"text", OPT_TEXT, '-', "Print the ec parameters in text form"},
  42     {"C", OPT_C, '-', "Print a 'C' function creating the parameters"},
  43     {"check", OPT_CHECK, '-', "Validate the ec parameters"},
  44     {"list_curves", OPT_LIST_CURVES, '-',
  45      "Prints a list of all curve 'short names'"},
  46     {"no_seed", OPT_NO_SEED, '-',
  47      "If 'explicit' parameters are chosen do not use the seed"},
  48     {"noout", OPT_NOOUT, '-', "Do not print the ec parameter"},
  49     {"name", OPT_NAME, 's',
  50      "Use the ec parameters with specified 'short name'"},
  51     {"conv_form", OPT_CONV_FORM, 's', "Specifies the point conversion form "},
  52     {"param_enc", OPT_PARAM_ENC, 's',
  53      "Specifies the way the ec parameters are encoded"},
  54     {"genkey", OPT_GENKEY, '-', "Generate ec key"},
  55     {"rand", OPT_RAND, 's', "Files to use for random number input"},
  56 # ifndef OPENSSL_NO_ENGINE
  57     {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
  58 # endif
  59     {NULL}
  60 };
  61
  62 static OPT_PAIR forms[] = {
  63     {"compressed", POINT_CONVERSION_COMPRESSED},
  64     {"uncompressed", POINT_CONVERSION_UNCOMPRESSED},
  65     {"hybrid", POINT_CONVERSION_HYBRID},
  66     {NULL}
  67 };
  68
  69 static OPT_PAIR encodings[] = {
  70     {"named_curve", OPENSSL_EC_NAMED_CURVE},
  71     {"explicit", 0},
  72     {NULL}
  73 };
  74
  75 int ecparam_main(int argc, char **argv)
  76 {
  77     ENGINE *e = NULL;
  78     BIGNUM *ec_gen = NULL, *ec_order = NULL, *ec_cofactor = NULL;
  79     BIGNUM *ec_p = NULL, *ec_a = NULL, *ec_b = NULL;
  80     BIO *in = NULL, *out = NULL;
  81     EC_GROUP *group = NULL;
  82     point_conversion_form_t form = POINT_CONVERSION_UNCOMPRESSED;
  83     char *curve_name = NULL, *inrand = NULL;
  84     char *infile = NULL, *outfile = NULL, *prog;
  85     unsigned char *buffer = NULL;
  86     OPTION_CHOICE o;
  87     int asn1_flag = OPENSSL_EC_NAMED_CURVE, new_asn1_flag = 0;
  88     int informat = FORMAT_PEM, outformat = FORMAT_PEM, noout = 0, C = 0;
  89     int ret = 1, private = 0;
  90     int list_curves = 0, no_seed = 0, check = 0, new_form = 0;
  91     int text = 0, i, need_rand = 0, genkey = 0;
  92
  93     prog = opt_init(argc, argv, ecparam_options);
  94     while ((o = opt_next()) != OPT_EOF) {
  95         switch (o) {
  96         case OPT_EOF:
  97         case OPT_ERR:
  98  opthelp:
  99             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 100             goto end;
 101         case OPT_HELP:
 102             opt_help(ecparam_options);
 103             ret = 0;
 104             goto end;
 105         case OPT_INFORM:
 106             if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
 107                 goto opthelp;
 108             break;
 109         case OPT_IN:
 110             infile = opt_arg();
 111             break;
 112         case OPT_OUTFORM:
 113             if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))
 114                 goto opthelp;
 115             break;
 116         case OPT_OUT:
 117             outfile = opt_arg();
 118             break;
 119         case OPT_TEXT:
 120             text = 1;
 121             break;
 122         case OPT_C:
 123             C = 1;
 124             break;
 125         case OPT_CHECK:
 126             check = 1;
 127             break;
 128         case OPT_LIST_CURVES:
 129             list_curves = 1;
 130             break;
 131         case OPT_NO_SEED:
 132             no_seed = 1;
 133             break;
 134         case OPT_NOOUT:
 135             noout = 1;
 136             break;
 137         case OPT_NAME:
 138             curve_name = opt_arg();
 139             break;
 140         case OPT_CONV_FORM:
 141             if (!opt_pair(opt_arg(), forms, &new_form))
 142                 goto opthelp;
 143             form = new_form;
 144             new_form = 1;
 145             break;
 146         case OPT_PARAM_ENC:
 147             if (!opt_pair(opt_arg(), encodings, &asn1_flag))
 148                 goto opthelp;
 149             new_asn1_flag = 1;
 150             break;
 151         case OPT_GENKEY:
 152             genkey = need_rand = 1;
 153             break;
 154         case OPT_RAND:
 155             inrand = opt_arg();
 156             need_rand = 1;
 157             break;
 158         case OPT_ENGINE:
 159             e = setup_engine(opt_arg(), 0);
 160             break;
 161         }
 162     }
 163     argc = opt_num_rest();
 164     if (argc != 0)
 165         goto opthelp;
 166
 167     private = genkey ? 1 : 0;
 168
 169     in = bio_open_default(infile, 'r', informat);
 170     if (in == NULL)
 171         goto end;
 172     out = bio_open_owner(outfile, outformat, private);
 173     if (out == NULL)
 174         goto end;
 175
 176     if (list_curves) {
 177         EC_builtin_curve *curves = NULL;
 178         size_t crv_len = EC_get_builtin_curves(NULL, 0);
 179         size_t n;
 180
 181         curves = app_malloc((int)sizeof(*curves) * crv_len, "list curves");
 182         if (!EC_get_builtin_curves(curves, crv_len)) {
 183             OPENSSL_free(curves);
 184             goto end;
 185         }
 186
 187         for (n = 0; n < crv_len; n++) {
 188             const char *comment;
 189             const char *sname;
 190             comment = curves[n].comment;
 191             sname = OBJ_nid2sn(curves[n].nid);
 192             if (comment == NULL)
 193                 comment = "CURVE DESCRIPTION NOT AVAILABLE";
 194             if (sname == NULL)
 195                 sname = "";
 196
 197             BIO_printf(out, "  %-10s: ", sname);
 198             BIO_printf(out, "%s\n", comment);
 199         }
 200
 201         OPENSSL_free(curves);
 202         ret = 0;
 203         goto end;
 204     }
 205
 206     if (curve_name != NULL) {
 207         int nid;
 208
 209         /*
 210          * workaround for the SECG curve names secp192r1 and secp256r1 (which
 211          * are the same as the curves prime192v1 and prime256v1 defined in
 212          * X9.62)
 213          */
 214         if (strcmp(curve_name, "secp192r1") == 0) {
 215             BIO_printf(bio_err, "using curve name prime192v1 "
 216                        "instead of secp192r1\n");
 217             nid = NID_X9_62_prime192v1;
 218         } else if (strcmp(curve_name, "secp256r1") == 0) {
 219             BIO_printf(bio_err, "using curve name prime256v1 "
 220                        "instead of secp256r1\n");
 221             nid = NID_X9_62_prime256v1;
 222         } else {
 223             nid = OBJ_sn2nid(curve_name);
 224         }
 225
 226         if (nid == 0)
 227             nid = EC_curve_nist2nid(curve_name);
 228
 229         if (nid == 0) {
 230             BIO_printf(bio_err, "unknown curve name (%s)\n", curve_name);
 231             goto end;
 232         }
 233
 234         group = EC_GROUP_new_by_curve_name(nid);
 235         if (group == NULL) {
 236             BIO_printf(bio_err, "unable to create curve (%s)\n", curve_name);
 237             goto end;
 238         }
 239         EC_GROUP_set_asn1_flag(group, asn1_flag);
 240         EC_GROUP_set_point_conversion_form(group, form);
 241     } else if (informat == FORMAT_ASN1) {
 242         group = d2i_ECPKParameters_bio(in, NULL);
 243     } else {
 244         group = PEM_read_bio_ECPKParameters(in, NULL, NULL, NULL);
 245     }
 246     if (group == NULL) {
 247         BIO_printf(bio_err, "unable to load elliptic curve parameters\n");
 248         ERR_print_errors(bio_err);
 249         goto end;
 250     }
 251
 252     if (new_form)
 253         EC_GROUP_set_point_conversion_form(group, form);
 254
 255     if (new_asn1_flag)
 256         EC_GROUP_set_asn1_flag(group, asn1_flag);
 257
 258     if (no_seed) {
 259         EC_GROUP_set_seed(group, NULL, 0);
 260     }
 261
 262     if (text) {
 263         if (!ECPKParameters_print(out, group, 0))
 264             goto end;
 265     }
 266
 267     if (check) {
 268         BIO_printf(bio_err, "checking elliptic curve parameters: ");
 269         if (!EC_GROUP_check(group, NULL)) {
 270             BIO_printf(bio_err, "failed\n");
 271             ERR_print_errors(bio_err);
 272             goto end;
 273         }
 274         BIO_printf(bio_err, "ok\n");
 275
 276     }
 277
 278     if (C) {
 279         size_t buf_len = 0, tmp_len = 0;
 280         const EC_POINT *point;
 281         int is_prime, len = 0;
 282         const EC_METHOD *meth = EC_GROUP_method_of(group);
 283
 284         if ((ec_p = BN_new()) == NULL
 285                 || (ec_a = BN_new()) == NULL
 286                 || (ec_b = BN_new()) == NULL
 287                 || (ec_gen = BN_new()) == NULL
 288                 || (ec_order = BN_new()) == NULL
 289                 || (ec_cofactor = BN_new()) == NULL) {
 290             perror("Can't allocate BN");
 291             goto end;
 292         }
 293
 294         is_prime = (EC_METHOD_get_field_type(meth) == NID_X9_62_prime_field);
 295         if (!is_prime) {
 296             BIO_printf(bio_err, "Can only handle X9.62 prime fields\n");
 297             goto end;
 298         }
 299
 300         if (!EC_GROUP_get_curve_GFp(group, ec_p, ec_a, ec_b, NULL))
 301             goto end;
 302
 303         if ((point = EC_GROUP_get0_generator(group)) == NULL)
 304             goto end;
 305         if (!EC_POINT_point2bn(group, point,
 306                                EC_GROUP_get_point_conversion_form(group),
 307                                ec_gen, NULL))
 308             goto end;
 309         if (!EC_GROUP_get_order(group, ec_order, NULL))
 310             goto end;
 311         if (!EC_GROUP_get_cofactor(group, ec_cofactor, NULL))
 312             goto end;
 313
 314         if (!ec_p || !ec_a || !ec_b || !ec_gen || !ec_order || !ec_cofactor)
 315             goto end;
 316
 317         len = BN_num_bits(ec_order);
 318
 319         if ((tmp_len = (size_t)BN_num_bytes(ec_p)) > buf_len)
 320             buf_len = tmp_len;
 321         if ((tmp_len = (size_t)BN_num_bytes(ec_a)) > buf_len)
 322             buf_len = tmp_len;
 323         if ((tmp_len = (size_t)BN_num_bytes(ec_b)) > buf_len)
 324             buf_len = tmp_len;
 325         if ((tmp_len = (size_t)BN_num_bytes(ec_gen)) > buf_len)
 326             buf_len = tmp_len;
 327         if ((tmp_len = (size_t)BN_num_bytes(ec_order)) > buf_len)
 328             buf_len = tmp_len;
 329         if ((tmp_len = (size_t)BN_num_bytes(ec_cofactor)) > buf_len)
 330             buf_len = tmp_len;
 331
 332         buffer = app_malloc(buf_len, "BN buffer");
 333
 334         BIO_printf(out, "EC_GROUP *get_ec_group_%d(void)\n{\n", len);
 335         print_bignum_var(out, ec_p, "ec_p", len, buffer);
 336         print_bignum_var(out, ec_a, "ec_a", len, buffer);
 337         print_bignum_var(out, ec_b, "ec_b", len, buffer);
 338         print_bignum_var(out, ec_gen, "ec_gen", len, buffer);
 339         print_bignum_var(out, ec_order, "ec_order", len, buffer);
 340         print_bignum_var(out, ec_cofactor, "ec_cofactor", len, buffer);
 341         BIO_printf(out, "    int ok = 0;\n"
 342                         "    EC_GROUP *group = NULL;\n"
 343                         "    EC_POINT *point = NULL;\n"
 344                         "    BIGNUM *tmp_1 = NULL;\n"
 345                         "    BIGNUM *tmp_2 = NULL;\n"
 346                         "    BIGNUM *tmp_3 = NULL;\n"
 347                         "\n");
 348
 349         BIO_printf(out, "    if ((tmp_1 = BN_bin2bn(ec_p_%d, sizeof (ec_p_%d), NULL)) == NULL)\n"
 350                         "        goto err;\n", len, len);
 351         BIO_printf(out, "    if ((tmp_2 = BN_bin2bn(ec_a_%d, sizeof (ec_a_%d), NULL)) == NULL)\n"
 352                         "        goto err;\n", len, len);
 353         BIO_printf(out, "    if ((tmp_3 = BN_bin2bn(ec_b_%d, sizeof (ec_b_%d), NULL)) == NULL)\n"
 354                         "        goto err;\n", len, len);
 355         BIO_printf(out, "    if ((group = EC_GROUP_new_curve_GFp(tmp_1, tmp_2, tmp_3, NULL)) == NULL)\n"
 356                         "        goto err;\n"
 357                         "\n");
 358         BIO_printf(out, "    /* build generator */\n");
 359         BIO_printf(out, "    if ((tmp_1 = BN_bin2bn(ec_gen_%d, sizeof (ec_gen_%d), tmp_1)) == NULL)\n"
 360                         "        goto err;\n", len, len);
 361         BIO_printf(out, "    point = EC_POINT_bn2point(group, tmp_1, NULL, NULL);\n");
 362         BIO_printf(out, "    if (point == NULL)\n"
 363                         "        goto err;\n");
 364         BIO_printf(out, "    if ((tmp_2 = BN_bin2bn(ec_order_%d, sizeof (ec_order_%d), tmp_2)) == NULL)\n"
 365                         "        goto err;\n", len, len);
 366         BIO_printf(out, "    if ((tmp_3 = BN_bin2bn(ec_cofactor_%d, sizeof (ec_cofactor_%d), tmp_3)) == NULL)\n"
 367                         "        goto err;\n", len, len);
 368         BIO_printf(out, "    if (!EC_GROUP_set_generator(group, point, tmp_2, tmp_3))\n"
 369                         "        goto err;\n"
 370                         "ok = 1;"
 371                         "\n");
 372         BIO_printf(out, "err:\n"
 373                         "    BN_free(tmp_1);\n"
 374                         "    BN_free(tmp_2);\n"
 375                         "    BN_free(tmp_3);\n"
 376                         "    EC_POINT_free(point);\n"
 377                         "    if (!ok) {\n"
 378                         "        EC_GROUP_free(group);\n"
 379                         "        return NULL;\n"
 380                         "    }\n"
 381                         "    return (group);\n"
 382                         "}\n");
 383     }
 384
 385     if (!noout) {
 386         if (outformat == FORMAT_ASN1)
 387             i = i2d_ECPKParameters_bio(out, group);
 388         else
 389             i = PEM_write_bio_ECPKParameters(out, group);
 390         if (!i) {
 391             BIO_printf(bio_err, "unable to write elliptic "
 392                        "curve parameters\n");
 393             ERR_print_errors(bio_err);
 394             goto end;
 395         }
 396     }
 397
 398     if (need_rand) {
 399         app_RAND_load_file(NULL, (inrand != NULL));
 400         if (inrand != NULL)
 401             BIO_printf(bio_err, "%ld semi-random bytes loaded\n",
 402                        app_RAND_load_files(inrand));
 403     }
 404
 405     if (genkey) {
 406         EC_KEY *eckey = EC_KEY_new();
 407
 408         if (eckey == NULL)
 409             goto end;
 410
 411         assert(need_rand);
 412
 413         if (EC_KEY_set_group(eckey, group) == 0) {
 414             BIO_printf(bio_err, "unable to set group when generating key\n");
 415             EC_KEY_free(eckey);
 416             ERR_print_errors(bio_err);
 417             goto end;
 418         }
 419
 420         if (!EC_KEY_generate_key(eckey)) {
 421             BIO_printf(bio_err, "unable to generate key\n");
 422             EC_KEY_free(eckey);
 423             ERR_print_errors(bio_err);
 424             goto end;
 425         }
 426         assert(private);
 427         if (outformat == FORMAT_ASN1)
 428             i = i2d_ECPrivateKey_bio(out, eckey);
 429         else
 430             i = PEM_write_bio_ECPrivateKey(out, eckey, NULL,
 431                                            NULL, 0, NULL, NULL);
 432         EC_KEY_free(eckey);
 433     }
 434
 435     if (need_rand)
 436         app_RAND_write_file(NULL);
 437
 438     ret = 0;
 439  end:
 440     BN_free(ec_p);
 441     BN_free(ec_a);
 442     BN_free(ec_b);
 443     BN_free(ec_gen);
 444     BN_free(ec_order);
 445     BN_free(ec_cofactor);
 446     OPENSSL_free(buffer);
 447     EC_GROUP_free(group);
 448     release_engine(e);
 449     BIO_free(in);
 450     BIO_free_all(out);
 451     return (ret);
 452 }
 453
 454 #endif